Table of Content

01 December 2012, Volume 34 Issue 6

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地质勘探

Palaeokarst Reservoirs and Exploration Areas of Maokou Formation in theSoutheast of Sichuan Basin

Guo Xusheng;Li Yuping;Wei Quanchao

2012, 34(6):  0-8. 

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The recent exploration breakthrough in the southeast of Sichuan shows that Maokou formation reservoir in Southeast
Sichuan has great exploration potential. The main technical methods are the vertical division，the seismic reflection characteristics
and the recovery palaeogeomorphology. Maokou formation palaeokarst can be divided into vertical vadose zone，horizontal
phreatic zones and deep slow flow zones in the vertical direction. Karst-type reservoirs are largely distributed in vertical vadose
and horizontal phreatic zones. There are featured by“Oblique bright spot”and“catastrophic amplitude”in the seismic
reflection characteristics，which are distributed within Longsheng，Tiantangba and Simianshan areas. Qijiang-Fuling area have
a nice exploration prospect，beacause it is located in east slope of Guandu karst slope.

Analysis on Dominating Factors and Conditions for the Formation ofNatural Gas Reservoir of Puguang Terrestrial Formation

Sun li;Liu Jiaduo;Wang Jun;Li Zhongchao;Wang Wenzhi

2012, 34(6):  0-16. 

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The hydrocarbon-source rock of Puguang continental facies formation mainly develop in Xujiahe Formation of Upper
Triassic，Ziliujing and Qianfoya Formation of Jurassic system with relatively bad region caprock condition which mainly
develop locally and consist of pelite of Xujiahe Formation and upper layer. The reservoir mainly develop in hydrocarbon-source
sag paleotectonics sections Xu2 and Xu4 sandstone of Xujiahe Formation. Based on comprehensive analysis to geological conditions
of accumulation such as the characteristics of hydrocarbon-source rock，reservoir condition，cap-rock distribution，trap
type and accumulation pattern，etc，it is realized that Puguang terrestrial facies formation possess preferable oil source rock and
oil-saturated reservoir rock collocation and cap rock which provide condition for the formation of terrestrial facies formation.
The gas reservoir distribution range is controlled by hydrocarbon-source sag. The movement direction of hydrocarbon is controlled
by paleohigh（paleoslope）in Yanshan period. The fault and fracture play dual role in both conducting and improving
reservoir. In above three factors，the latter two factors dominate the formation of Puguang terrestrial facies natural gas reservoir
by linking up hydrocarbon sources and helping sedimentary facies zones and forming traps.

Reservoir-forming Pattern of Typical Hydrocarbon Accumulation Zone inHuizhou Sag

Wu Juan;Ye Jiaren;Shi Hesheng;Shu Yu;Kang Jianyun

2012, 34(6):  17-26. 

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Based on geological，seismic and geochemical data，by means of fluid inclusion microfluorometric and thermodetecting
techniques，this paper focuses on the study of reservoir-forming patterns and enrichment regulation of typical hydrocarbon
accumulation zone in Huizhou Sag. The results show that oil from Wenchang source rock distributes widely in Huizhou
Sag，hydrocarbon migrating vertically through faults or vertically then laterally through compound transport system，which
experienced two accumulation periods，so the reservoir-forming patterns of Huixi—Liuhua accumulation zone can be divided
into single source–short distance–migrated vertically–multi–phase pattern，mixed source–short distance–migrated vertically–
multi–phase pattern，mixed source–short distance–migrated vertically and laterally–multi–phase pattern，single source–far
distance–migrated vertically and laterally–one–phase pattern. And reservoir forming pattern of Huizhou—Lufeng accumulation
zone is single source–short distance–migrated vertically–multi–phase episodic pattern.

Reservoir Rocks Characters of Silurian and its Unconventional GasProspection in Western Hubei—Eastern Chongqing

Ma Wenxin;Liu Shugen;Huang Wenming;Zhang Changjun;Zeng Xiangliang

2012, 34(6):  27-37. 

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The study area（western Hubei—eastern Chongqing）was a transitional zone between steep detachment fold belt
in eastern Sichuan and block-basement fault-fold belt in western Hunan—Hubei. There the deformation is relatively weak，
and oil & gas geological preservation condition was better than surrounding areas. Based on the well drilling and field data，
employing the petrology，thin section，SEM and organic geochemical analysis，we studied the characteristics of the macro and
micro Silurian reservoir rocks and their oil & gas prospection. The results show that：the main lithology of Longmaxi Formation
was black carboniferous shale，deep gray（gray）shale and silty mudstone. The micro-reservoir spaces were highly developed
including intergranular dissolution pores of clay minerals，dissolution pores in feldspar and quartz，microfratures and so on.
Source rocks with high quality were developed east to the belt of Well Jianshen 1 and Lengshuixi. And the microporosity and
microfractures were very rich in Silurian. The Silurian Hanjiadian Formation gas reservoir belonged to tight gas. Based on
the Well Jianshen 1 gas reservoir characteristics and the existing drilling analysis data，we conclude that Shizhu composite
anticline，Lichuan and Huaguoping composite syncline are fully equipped with tight gas and shale gas exploration potential.

Lithologies Recognition and Reservoir PredictionLithologies Area

Hong Zhong;Su Mingjun;Liu Huaqing;Zhang Jing;Cai Gang

2012, 34(6):  38-46. 

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In most petroleum-bearing basins of China，the lithologies of continental deposition strata are complex. The overlapping
ranges of acoustic impedance values of different lithologies lead to the non-uniqueness of lithological seismic interpretation.
Rapid change of fluvial energy，high frequency of transgression and regression contribute to the wide development of thin
inter-bedding. The interferences between thin inter-bedding are universal，which affect the precision of seismic interpretation.
Aiming at the complex lithology-acoustic impedance relationship，the difficulties of traditional seismic reservoir prediction
methods in identifying complex lithologies have been analyzed systematically. Also，according to the geophysical response
features of the complex lithologies，the sensitive well logging parameter of identifying complex lithologies is chosen. The
ninety-degree phasing of seismic traces in a relative impedance sense is selected to serve as a constrained role in well logging
parameter inversion. The result shows that this method is capable of recognizing complicate lithologies efficiently and the goal
of explicit reservoir characterization in complex lithologies area can be obtained.

Study on Four Property Relationship of Baikouquan Formation inTriassic，Mabei Oilfield，Junggar Basin

Wu Tao;;Zhang Shuncun;Zhou Shanglong;Shi Ji´an

2012, 34(6):  47-52. 

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The lithology，electrical property，physical property and oiliness of Baikouquan Formation in Triassic，Mabei
Oilfield，Junggar Basin were analyzed by using data of drill core，well logging，oil testing and analysis test. Their relationship
and affecting factors are summed up，and the interpretation models of porosity，permeability，and oil saturation were established.
The research indicates that rock pattern，grain size，sorting，shaliness and cements type are key factors of controlling physical
property of oil reservoir. Most of lithology have good oil-bearing occurrence，especially conglomerate，glutenite and gravelbearing
sandstone. The grade of oil display is gradually increased with physical property. There is also a positive correlation
between oil saturation，formation resistivity and physical property. Through the research of four property，as well as the cross
plot of oil testing，physical and electrical parameters，the quantitative interpretation standard of oil reservoir for Baikouquan
formation was established to divide oil layer，acquifer and dry layer. Therefore，it provides the scientific evidence for future
petroleum development and exploration.

Multi-point Geostatistical Approach to Model Karst Facies ofFracture-cavity Reservoir in Tahe Oilfield

Liu Xueli;Wang Yan

2012, 34(6):  53-58. 

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The Ordovician fractured-vuggy Carbonate reservoirs in Tahe Oilfield are typically complicated ones with various
types of reservoir spaces and very strong heterogeneity. Studies reveal that the distribution of the reservoir spaces have strong
relation to the sedimentary condition but is determined by the tectonic karstification. Therefore the convention model method，
such as two point statistical methods，cannot provide accurate three-dimensional geology models. In this paper，one new concept
of karst phase is defined according to the characters of the the fractured-vuggy units. After the karst phases of the single wells
as wells as the training image model are studied，the 3D karst phase modes are established by using multi-point geostatistical
methods to simulate the karst phase distribution. Finally，taking the distribution as a constraining data，we create a reasonable
three-dimensional geology models with sequential algorithm.

Dip Data Interpretation Under Extensive Structure

Du Xudong;Zhuang Wei;You Zheng

2012, 34(6):  59-65. 

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Several elements that can make the dip data interpretation models complex are summarized under the extensive
structure setting in this paper. They should be integrated with the relative sedimentary facies，lithologic character，borehole
condition and wireline logging time，et al. Because the structure styles in the extensive basin are complex and diverse，the
dip data interpretation models also have multiple solutions. Several dip data interpretation models under different structural
location of listric fault depending on the geologic section were described，and a dip data interpretation example that one dip
pattern can correspond with several structural styles was analyzed. So geology model is to be obtained by combining with dip
model and geology background and other data，especially，seismic profile.

Strata Structure and Sealing Analysis for Donghe Sandstone Reservoir inTuofutai Area

Yang Shiming;Sheng Haibo

2012, 34(6):  66-72. 

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The top structure of Donghetang Formation to the west of Tuofutaiat is Monocline structure，and there are many
low-amplitude anticlines in the local area. In this region，Donghe sandstone reservoir is primarily a dam deposits reservoir，
which is under the environment of regression by palaeo geomorphology control. Denudation pinchout happens in Devonian
Donghetang Formation strata，silurian Kepingtage Formation strata under Donghetang Formation and carboniferous Bachu
formation strata overlying Donghetang Formation. Lithology of Donghetang Formation strata and its contacting strata has a
local distribution features，structure，stratigraphic lithology and stratigraphic contact relation. These three factors caused the
characteristics of sealing for Donghetang Formation reservoir trap of roof，floor and lateral. Through the construction and the
roof and floor lithologic analysis and sealing analysis，the effective trap distribution area was found out，which has realistic
meanings to further exploitation at further exploration in the present and peripheral zones.

Study on True or False Carbonate Reservoir Recongnition Methods Basedon Well Logging in Tarim Oilfield

Sima Liqiang;Zhang Fengsheng;Zhao Ran;Yang Hongpeng

2012, 34(6):  73-78. 

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The fracture and cave reservoir of Ordovician formation in area 12 in Tahe Oilfield has a strong heterogeneity，and
complex spatial structure of reservoir which highly develops pores，holes，and fracture is developed is complex. There are many
layers which have the similar characteristics of reservoir in the Ordovician formation in Tahe Oilfield，but they turn out to be
the false reservoir for the test oil is dry layers. If these false reservoirs are not analyzed and removed，it is difficult to accurately
identify the reservoir. What’s more，it will cause the erroneous interpretation of well logging and the direct economic losses of
oil test and production. Thus，how to identify true or false reservoir with log data becomes the key of reservoir evaluation in
Tahe Oilfield. In this paper，we sum up the log response characteristics of true and false reservoir in area 12 in Tahe Oilfield，
and establish the identified patterns of true or false carbonate reservoir with well logging，FMI and core data，which reduces
the wrong and omission reservoir identification to improve the accuracy of reservoir logging evaluation.

石油与天然气工程

Experimental Research of Physical Simulation on Visual Model WaterFlooding Flow Character of Multi-Layer Sandstone Reservoir

Pan yi;Dong Weijun;Feng Liang;Tang Huaiyi;Chen Yingying

2012, 34(6):  79-86. 

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Based on the actual reservoir geology character，a large-scale visual sandbox physical model was designed to study
the flow mechanism in multi-layer sandstone reservoir directly. The effects of different injection methods and velocities on the
efficiency of water flooding and distribution of water and oil in the process of water flooding are studied. The model has a larger
size and a high degree of simulation，and visualization. It is more representative than other models. The model was designed
on the basis of sandstone strata in a block of NP Field，according to the principle of similar geometric，the same well-type，
sequence rhythm，and fluid viscosity，so that the simulation of underground conditions is more real. The real results show
that different injection methods and velocities have great effect on the recovery of the model. When there are more wells，and
single well controlled area is small，recovery will be highlightly；when the injection velocity is low，and water breakthrough
islate，water cut increases slowly，thich can effectively enhance oil recovery，and also reflects to gravitational differentiation.
The waterflood characteristic curve fitting shows that the new experiment meets water displacement feature，so it can predict
recoverable reserves and recovery accurately. This research presents a new physical simulation equipment，to help choose a
reasonable work system.

The Study on Water Drive Characteristic Curve of Fractured-vuggyCarbonate Reservoir

Xiao Yang;Cai Zhenzhong;Jiang Tongwen;Feng Jilei;Xie Jianfei

2012, 34(6):  87-93. 

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Fractured-vuggy carbonate reservoir space are complex，showing very strong heterogeneous and multi-scale feature.
Despite the fact that certain well water drive characteristic curves presen sandstone reservoir characteristics or single straight
segment characteristics，much of the rest well water drive characteristic curves are step-like curve with segments of straight
line or irregular features，so it is not justified to apply water drive characteristic curve into them without selection. In this
paper，more than 50 water drive characteristic curves at home and abroad are screened，and water drive characteristic curve for
Sangnan Western is selected for application. The analysis results show that the correlation of practical data and applications is
the key consideration when applying water drive characteristic curve to fractured-vuggy carbonate reservoir. In order to further
perfect the application of water drive characteristic curve of fractured-vuggy carbonate reservoir，the relevant matters of water
drive characteristic curve application for fractured-vuggy carbonate reservoir are presented，too.

Study on Quantification Method of Interlayer Pressure Textural Differenceof the Reservoir During High Water Cut Period

Zhao Ming;Pan Hong;Liu Ruiping;Deng Li

2012, 34(6):  94-100. 

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Abstract：As a result of long-term water injection development and interlayer heterogeneity，reservoir at high water cut period
has serious interlayer pressure textural differences，a knowledge of which is the important basis of rational adjustment. In view
of the lack of testing pressure data of well site，and the difficulty in single pressure data acquisition，a quantitative mathematical
model of the high water-cut period stratum interlayer pressure textural difference was established with the percolation mechanics
principle. The key parameters of the model can be obtained by production data. The example in Zaoyuan Oilfield showed that：
high water cut reservoir interlayer pressure is obviously different. The method can determine the pressure differences of each
layer. And calculating results is close to the testing data. It is helpful for recognizing the development contradiction，and for
providing the technical basis for reasonable adjustment.

The Evaluation and Analysis of Hydraulic Extensions Ability of HorizontalSection in Deep Horizontal Wells

Xu Kunji;Xiong Jiyou;Chen Jun;Qin Dawei;Xu Honglin

2012, 34(6):  101-106. 

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On the basis of the theory of drilling fluid hydrodynamics，we analyzed the stress situation of horizontal section in the
horizontal well，and find that the pressure loss in the annulus space of the horizontal well and the total circulating pressure loss
are of the two main factors that restricted horizontal section extension ability. In this paper，pressure loss in the annulus space
of the horizontal well and the total circulating pressure loss in the whole borehole are calculated，and the horizontal hydraulic
extensions ability value was obtained，and then the drilling fluid density，debris bed height，pump pressure and drilling fluid
delivery rate and the effect on the horizontal section extension ability was analyzed. In order to enhance the horizontal hydraulic
extensions ability，we can use low mud density and the lower height of cutting bed is kept. We can draw a conclusion that we
can enhance the horizontal hydraulic extensions ability by choosing drilling pump with higher rated pump pressure.

Analyses of Influencing Factors and Mechanism of Controlling BottomWater in Horizontal Well with Inflow Control Device

Fang Quantang;Zhang Fengli;Duan Yonggang;Shuai Chungang;Wei Mingqiang

2012, 34(6):  107-112. 

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With the development of drilling and completion technology，developing bottom-water drive reservoir with inflow
control device（ICD）completion technique in horizontal well is efficient for increasing the yield and reducing the cost. Understanding
the mechanism and influencing factors of controlling bottom water in horizontal well with ICD is crucial to delay
the bottom water coning and improve the ultimate recovery with inflow control device technology. Based on the mechanism
analysis of ICD characterization for bottom water coning control and flowing restraint，this paper has simulated and studied the
3 main influencing factors on ICD’s water control effect，namely，the flowing profile，annulus flow and water ratio. The results
show that：First，in reservoir without high water ratio section，ICD can be used to increase the hypertonic segment resistance
and water is controlled at the expense of total liquid production. Second，the additional pressure drop generated by ICD can
effectively reduce annulus flow and increase the stability of ICD water control to ensure long-term stable production and water
control. Third，misunderstanding of the reservoir properties will greatly affect ICD’s water control effect. Fourth，in horizontal
well with high water ratio section，the effective water control can be realized by increasing the additional pressure drop and
lower the liquid production of the section. This study of ICD’s water control mechanism and influencing factors in horizontal
well can provide technical clue for optimizing ICD completion.

A New Deconvolution Algorithm Based on Pressure Derivative

Hu Xixaohu;Zheng Shiyi;Long Shengxiang

2012, 34(6):  113-117. 

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The pressure deconvolution result is very sensitive to the initial reservoir pressure，and the error in this parameter
must be controlled within 0.5%. It requires at least two different flow periods to determine this parameter by Levitan’s method，
and it is very susceptible to such factors as nonlinearity in pressure and rate data. A new deconvolution algorithm based on
pressure derivative is presented，and it’s in sensitive to the initial reservoir pressure. Moreover，only one flow period can be
used to determine its value. Through detailed analysis in this paper，this algorithm can tolerate both errors in pressure and rate.

The Productivity Analysis of Different Flow Units in Bi-301 Wellblock ofBiyang Depression

Yang Xiaopei

2012, 34(6):  118-122. 

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On the basis of the sedimentary microfacies and the analysis of reservoir physical properties，a series of parameters
such as the porosity，permeability，flow zone index，etc，were selected for the classification of the flow units of oil formation
of Bi-301 wellblock H3 Member in the Zhaowa Oilfield of Biyang Depression were classified. According to the value of flow
zone index，the studying area has been divided into five flow units，named FU-A，FU-B，FU-C，FU-D and FU-E. The result
shows that all kinds of flow units have good corresponding relation with physical property，lithology，sedimentary microfacies.
Besides，the productivity of different flow units is analyzed. The results mainly indicate three respects. First，flow units’ classification
objectively reflects the geological characteristics of poor reservoir property and strong heterogeneity. Second，there
exists very significant power correlation between the single well productivity and flow zone index. Finally，the productivity
differences of different flow units are obvious，and FU-A with the best physical properties has the highest productivity while E
flow unit with the worst physical properties has the minimum productivity.

Study on Discrete Fracture Model Two-phase Flow Simulation Based onFinite Volume Method

LÜXinrui;Yao Jun;Huang Zhaoqin;Zhao Juan;

2012, 34(6):  123-130. 

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Correctly recognizing the flowing rules of fractured reservoir is the foundation of high development efficiency. Discrete
fracture model has become a research hot spot，because it can explicitly simplify fracture by using reduction dimensional
method，which can greatly improve computing efficiency of the numerical simulation. Finite volume method has a clear physical
meaning in every control volume，and can ensure local mass conservation strictly，so it is appropriate for the situation of
discontinuous flow field. In this paper，we use the median dual of Delaunay triangular mesh to control the volume cell，establish
the numerical computational scheme of discrete fracture model，study on oil-water two phase numerical simulation of discrete
fracture model，and verify the correctness and efficiency of theory and algorithms through examples. The results show that this
method can ensure local mass conservation strictly，and the convergence is better in the process of the calculation. It is well
suitable for fractured reservoir simulation，and has very good consistency with single porous medium model，the computing
efficiency improved 2.5∼3.0 times.

Experimental Study on Micro-displacement Oil for Different CO2Displacement Mechanism

Du Jianfen;Chen Jing;Li Qiu;Guo Ping;Guo Ping

2012, 34(6):  131-135. 

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For more direct observation and comparison of the enhanced oil recovery mechanism with different displacement
ways by CO2，the high-pressure visualization micro model is adopted，which is similar to stratigraphic pore structure to perform
four groups of experiment of water flooding，miscible displacement，nearly immiscible displacement and immiscible
displacement by CO2 in this paper. Based on the color image processing technology and binary image two-value method，the
different displacement front，oil-gas interface，oil-gas distribution characteristics，oil area in model and oil color change of
the different displacement way are studied and contrasted. The research shows that most water displaces oil with unpistol-like
flow during water displacement and oil-gas interface is of convex curve；in CO2 immiscible displacement，there are obvious
gas-liquid two-phase flow between them，the shape of the gas-liquid interface is sharp and the streaming and mixed phase flow
of gas-liquid is more serious and the gas breaks through early；In CO2 nearly immiscible displacement，the oil-gas interface is
dim，gas-liquid diphase region is not obvious and no obvious gas-liquid transition zone is formed. While in the process of CO2
miscible displacement，a distinct gas-liquid transition zone is formed and oil-gas interface is obviously sleek and fuzzy. And，
under the same condition，the CO2 miscible displacement lasts longer than others during the whole displacement process. This
study is of great significance for understanding oil displacement with CO2 and its mechanism.

油气化学工程与化工

Study on Efficient Self-assembly Supramolecular Oil Displacement System

Xu Liang;Chen Yuqiao

2012, 34(6):  136-140. 

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High quality chemical flooding resources of type I and II reservoir reserves have nearly run out in Shengli Oilfiled.
Type III reserves with high temperature and high salt reservoirs（reservoir temperature > 85 ℃，salinity > 30 000 mg/L）will
be in the main position in the tertiary oil recovery in the future. But in the implementation of polymer flooding process in
high temperature and high salt reservoir meets such problem as viscosity reduction after polymer comes across salt，high temperature
hydrolysis，and high temperature degradation，which has a serious impact on polymer flooding technology application.
Supramolecular system is a molecular gather system where a small molecules make self-assembly through the intermolecular
force. With super molecular engineering and supramolecular chemistry theory as the foundation，and by synthetizing three
kinds of efficient supramolecular products and oil displacement system，are make evaluation of oil displacement performance
of the synthesis of supramolecular system. Experiments show that RTS type supramolecular system viscosifying action effect
is remarkable，with good heat and salt resistance，and a good adaptability to sewage，and excellent ageing stability. Indoor
physical model experiments show that it is quite effective in improving oil recovery，and has good application prospect.

Analysis of Sulfides in Fluid Catalytic Cracking Liquid Products

Yang Shuqing;Zheng Xianmin

2012, 34(6):  141-145. 

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The method for separation and determination of sulfur compounds in FCC liquid products by gas chromatography
with pulse flame photometry detector（GC-PFPD）is established. The qualitative and quantitative analysis of the main sulfide
are made based on the retention time of some pure sulfide and literatures. The results show that the main sulfide are thiophenes，
benzothiophenes and dibenzothiophenes. Different average correcting factors are used to quantify total sulfur and sulfur compounds
in gasoline and diesel oils fractions in FCC liquid products. The method is applied for determination of the contents of
total sulfur and sulfur compounds as a function of the ratio of catalyst to oil and reaction temperature.

石油机械工程及其他

Numerical Simulation of Flow Field of the Inclined Oil-Water Separator

Liu su;Su Qingwei;Huang Kun;Li Xinzhan;Jiang Yi

2012, 34(6):  146-152. 

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The inclined oil-water separator is a new and high efficient gravity separation equipment. In order to analyze
the separation mechanism and the internal flow distribution of the inclined oil-water separator，this article uses Fluent 12.0
numerical simulation software，and Elulerian multiphase-flow model combined with the Realizable k–" two equation turbulent
model to simulate the oil and water separation process in the separator. The results show that the method of numerical simulation
can better reflect the separation performance and internal flow field distribution. Compared with the conventional horizontal
separator，the“dead zone”of water and oil in the weir plate of the inclined oil-water separator is obviously reduced，and the
separating efficiency is higher. Oil and water separation efficiency is 90.48% when the angle is 12◦，the separation efficiency
increased 29.26%. Inclined oil-water separator has the advantage of simple structure，but the internal flow field is very complex.
The velocity distribution of the entrance liquid separating pipe is not uniform and there exists different degree of cyclone. This
can cause oil and water mixing in the interface. Therefore，the structures of entrance liquid separating pipe need to be further
improved.

Research of Auto-drilling Technology Based on Parameters’ Self-adjustingFuzzy Control

Guo Fuqin;Hua Pengtao

2012, 34(6):  153-160. 

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Due to the defects of the traditional drilling method，as well as the complexity of the drilling process and difficult
in establishing mathematical model，etc，this paper briefly analyzes the principle of auto-drilling system on AC frequency conversion
and the relationship among all factors affecting auto-drilling and puts forward a technology that combines parameters’
self-tuning fuzzy control with constant WOB（Weight On Bit）auto-drilling technology on AC frequency conversion. Based
on the judgement of drilling pressure trend，the application of parameters’ self-tuning fuzzy control leads to the control of the
rig’s speed. The algorithm does not need accurate mathematical model and can learn to fix control parameters in real time by
itself. The test shows that the control system has good performance and high precision，ensuring constant WOB and stable
speed in auto-drilling，and thus improving the rapidity，adaptability and robustness of system. The field applications prove that
this algorithm control effect is superior，with the steady-state accuracy within ±0.5 t. The control algorithm can also be used in
other auto-drilling systems.

The Fuzzy Analysis of Development Feasibilities of the LNGVehicles Industry

Wang Huiming;Liang Zheng

2012, 34(6):  161-168. 

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The LNG vehicles industry is an emerging vehicles industry，and the feasibility study and evaluation of the development
of LNG vehicles industry is its premise and basis for popularizing this industry. Feasibility evaluation results can
be provided for the governments or enterprises，for their decision making concerned the development of LNG vehicles industry.
This article analyzes the feasibility of developing LNG vehicles industry from technical，economic，environmental
and resources protection capacity，structures the feasibility index system of LNG vehicles industry development，puts forward
specific methods for developing LNG vehicles industry using multi-layer fuzzy comprehensive evaluation by establishing
reasonable set of factors，evaluations，or weight sets and so on，and uses examples to do specific calculations and analysis
application. The feasibility of LNG vehicles industry developing by using multi-layer fuzzy comprehensive evaluation is very
good，and popularization and application of the LNG vehicles is quite feasible.

博导论评

An Analysis of the Feixianguan Formation Dolomite Origin inNortheastern Sichuan Basin

Peng Jun;Tang Dan;Zhang Guirui;Li Bin;Cao Jixiang

2012, 34(6):  169-174. 

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On the basis of the overview of status and problems of Feixianguan Formation dolomitite origin in the Northeastern
Sichuan Province，through the study of the micrite-microcrystalline dolomite and fine grain-microtek dolomite’s petrological
features，degree of order characteristics，cathodoluminescence characteristics，isotopic，and the diagenetic fluid temperature，
paleosalinity：we think that dolomitization of rocks formed by the microcrystalline dolomite，such as micrite- microcrystalline
dolomitite，algal-laminated dolomitite，etc.，are Quasi-syngenetic dolomitization，but dolomitization of rocks mainly composed
of the fine grain-microtek dolomite，like crystalline dolomitite，oolitic dolomitite，etc.，are formed by burial dolomitization，
The analysis of the distribution features of strontium isotope we come to the conclusion that the burial dolomitization occurred
in a closed system.

探讨与争鸣

Study on the Diagenetic Facies and Effective Clastic Reservoirs inLiushagang Formation of Weixinan Sag

Liu Jinghuan;Wang Ruili;You Li;Bai Xue

2012, 34(6):  175-184. 

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Based on thin-section，clay X-ray diffraction and vitrinite reflectance，diagenetic stage of Liushagang Formation
is determined to be early B to middle B. According to quantitative analysis of diagenetic parameters，eight diagenetic facies
are determined the main diagenesis among which is comparison. different pore evolution exists middle-deep interval，which
is mainly controlled by rock types and diagenetic difference. Formation test and pore-permeability relationship are applied to
draw a conclusion that lower limit of permeability is 5 mD. Empirical formula is used as basic pore evolution model and the
error of porosity prediction is 0.2% to 2.8%. The division of clastic reservoir types is found by porosity，permeability，rock
type，pressure and production capability. The better to best reservoir types are related to delta front underwater channels and
moderate compaction facies. The reservoir property of basin-lake fan is poorer than delta sandbar at the same depth.