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    20 November 1999, Volume 21 Issue 4
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    油气藏工程
    FUZZY COMPREHENSIVE ANALYSIS TO DETERMINE THE DIFFICULTY OF WATERFLOOD IN WATER DRIVE RESERVOIR
    HUANG Bin-guang FU Yong-qiang TANG Hai et al
    1999, 21(4):  1-3.  DOI: 10.3863/j.issn.1000-2634.1999.04.001
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    Based on the geologic factors which have great effects on sandstone reservoir waterflooding, fuzzy comprehensive analysis is applied to formulate the indexes system and a new method of evaluating the effect of water displacement. The applying results in the such oilfields as Shuanghe and Ya Er Xia In Yumen show that the method is of characteristics of fewer data needed,
    higher accuracy, more simplification and so on. And it is greatimportant to study a reservoir whether the formation is suitable for water injection or not
    THE EFFECTS OF WETTABILITY ON THE DISTRIBUTION OF REMAINING OIL IN THE CONGLOMERATE RESERVOIRS
    GUO Xiao DU Zhi-min REN Yi-qun
    1999, 21(4):  4-6.  DOI: 10.3863/j.issn.1000-2634.1999.04.002
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    The recovery of conglomerate reservoirs is not high after secondary recovery and quantity of remaining oil has been remained in the reservoirs. Wettability is an important factor controlling the distribution of the oil, it strongly affects capillary pressure, relative permeability, waterflood behavior and efficiency. The distribution of the remaining oil saturation in sections in a reservoir scale for strong water-wet and strong oilwet conglomerate reservoirs has been studied in the paper by applying numerical simulation, and effects of sequence rhythm and depth on the distribution of remaining oil in conglomerate reser-
    voirs have also been studied. Furthermore, a dimensionless parameter is introduced to analyze the simulation results.

    A STUDY OF NON-DARCY FLOW SIMULATION IN FRACTURED GAS WELLS
    GUO Jian-chun ZHAO Jin-zhou YANG Xue-fei
    1999, 21(4):  7-10.  DOI: 10.3863/j.issn.1000-2634.1999.04.003
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    The resistance to flow of low viscosity gas in fractured wells with high conductivity fractures decreases and flow velocity rapidly increases, non- darcy flow near wellborn occurs.
    There is a big gap between the production performance prediction on the fractured wells using the typical curves developed by darcy flow law and practice. On the basis of the non-darcy flow factor, this paper presents the non-darcy flow mathematical model of real gas in the reservoir and fracture. The corresponding numerical model and solution methodology is derived
    by the finite difference method and the numerical algorithm of non-darcy flow factor is derived. The pressure performance at buttonhole, formation and propped fractures and non-darcy factors in the fractured gas well production are simulated and calculated. The results show the non-darcy flow exited in the fractured wells has much effect on the pressure and production
    performance. The effect has more notable in the lower conductivity or higher productivity well. The model and methodology can be applied to the performance prediction in a fractured well.

    RESEARCH ON HYDROCARBON GENERATION PHASE BEHAVIOR BY USING THE DATA OF HIGH TEMPERATURE AND PRESSURE SIMULATION EXPERIMENT
    CHEN Yi-cai LI Yan-jun ZHANG Mao-lin
    1999, 21(4):  11-14.  DOI: 10.3863/j.issn.1000-2634.1999.04.004
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    Based on three domestic groups of simulation experiment data of kerogen typeⅠ,Ⅱ, and Ⅲ, and through the calculation of mole composition of hydrocarbon-generation products,pvt phase maps are computed by applying pr state equation;analysis to oil/gas ration of hydrocarbon-generating products and PVT phase maps shows there are two types of hydrocarbon
    generating phase behavior of kerogen typeⅠandⅡ, i.e.,“oil phase”and“gas phase”, the critical percentage for Ro is 1.5%1.6% and 0.9%1.0% respectively; and the hydrocarbon generating products by kerogen typeⅢare all“gas phase”.

    DYNAMIC DISPATCH OF KNOWLEDGE IN RESERVOIR NUMERICAL SIMULATION EXPERT SYSTEM
    CAO Xie-dong
    1999, 21(4):  15-17.  DOI: 10.3863/j.issn.1000-2634.1999.04.005
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    The development of the assisted expert system for the history matching of reservoir numerical simulation is a process on the increase. The knowledge base is going to be proficient and expanded with the improvement of system function, the blocks of the knowledge can be formed in the light of the different solutions. This paper describes the dynamic dispatch mechanism
    of knowledge for consummate of the assisted expert system for the history matching of reservoir numerical simulation. In the modified clips system, the inferential mechanism is that the rules and facts are chosen into inferential machine dynamically according to present status during inference; the ODBC interface of the inferential service object is made to dispatch rules and
    facts stored in many heterogeneous databases. In the mean, the foundations of the research and development for multi-expert system is built.
    APPLICATION OF THE NUMERICAL SIMULATION ON WATER INJECTION DRIVE RESERVOIR TO IMPROVE PRODUCTION OF M RESERVOIR IN LAO JUNMIAO OILFIELD
    ZHANG Mao-lin KONG Xian-yan MEI Hai-yan et.al.
    1999, 21(4):  18-22.  DOI: 10.3863/j.issn.1000-2634.1999.04.006
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    The residual oil distribution in the top area of the m reservoir in Lao Junmiao oil field is studied by using the numerical simulation software for water injection reservoirs (OFIW) based on the geologic characteristics and production history of the reservoir. The relatively higher residual oil concentration areas are found in the vertical and lateral direction of the m reservoir. The artificial adjustment schedules and new wells’locations are
    designed and their future performance is predicted, and comparison of production efficiency for each plan is conducted. The present production data has demonstrated that the numerical simulation is successful in providing a scientific direction for the adjustment of the m reservoir, controlling water rate increasing, stabilizing the oil production rate and making a good economic and social profit.
    THE RESEARCH AND APPLICATION OF PERMEABILITY, POROSITY AND NET OVERBURDEN PRESSURE LAWS
    WU Fan SUN Li-juan HE Jiang
    1999, 21(4):  23-25.  DOI: 10.3863/j.issn.1000-2634.1999.04.007
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    Studying the variation of porosity, permeability and the net overburden pressure in formation, can guide the development and modification of oilfields, to statistical and analysis and research on the natural core data of Zhongyuan oilfield by using the newly introduced cmx-300, the core automatic analyzer
    developed in late 1980’and applied to study high-pressure porosity and permeability were made. The research shows that the relationship between formation porosity, permeability and net overburden pressure is closely related to univariate quadratic equation; when porosity matches net overburden pressure with exponent relationship, the presented physical significance is clearer, the accuracy requirement can be met and the compressibility of rocks can gained automatically. The compressibility
    and average hydraulic radius of the rocks is exponential is put forward; the ratio of permeability under the net overburden pressure and ground permeability is only related to the value of the overburden pressure, but nothing to do with the surface permeability.
    A NEW APPROACH TO GAIN FLOWING PARAMETERS OF FINE RESERVOIR NUMERICAL SIMULATION—MICRO NETWORK SIMULATION
    HU Xue-tao LI Yun
    1999, 21(4):  26-29.  DOI: 10.3863/j.issn.1000-2634.1999.04.008
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    It is the key and also very difficult point to gain flowing parameters of fine reservoir simulation. Based on the hierarchy and textural feature of geological events, stochastic simulation in micro networks is used in this article to acquire the flowing parameters by transforming macro phenomena into a study in micro- mechanism. In the paper, stochastic network model built with oriented percolation is flexible and convenient. Different kinds of pore structures and wettability of sand rock can be easily structured using the stochastic network model. The model can truly present the micro-character of porous media, and it can also be used to simulation flowing parameters quickly and effectively. It has been proved with case study that stochastic simulation in networks is an effective new approach to gain flowing parameter of small dimensions in fine reservoir simulation.

    CHARACTERISTIC LINEAR AND FINITE DIFFERENCE SOLUTIONS OF TWO-PHASE NON-DARCY SPHEROIDAL FLOWING THROUGH POROUS MEDIAFOR HORIZONTAL WELL
    DENG Ying’er LIU Ci-qun
    1999, 21(4):  30-34.  DOI: 10.3863/j.issn.1000-2634.1999.04.009
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    Horizontal well technology is an effective one of increasing production. A horizontal well can bring out three-dimensional flow in the direction of normal of developing and revolving spheroids-conjugate equal-pressure spheroids and hyperboloid streamline bunches whose focal points are the two ends of the well when it works. A mathematical model of oil and water two phase fluid non-darcy flow in the direction of normal of the spheroids with starting pressure gradient (spg) taken into account, which is a nonlinear equation with a moving boundary,is established according to concepts of revolving spheroids and equivalent developing cylinders. Characteristic linear and finite difference solutions to the model are derived respectively and water saturation distribution curves are presented. And the law of the moving boundary is found. Results show good agreement between the characteristic linear and finite difference solution.
    Influence of spg and injection rate on water cut and its derivative, saturation distribution and the laws is discussed respectively. The paper provides numerical simulation of water flood development to low permeability oil fields in the case of horizontal wells with theoretical basis. The mathematical model is also fit for water flood development of bingham viscous oil fields in the
    case of horizontal wells.
    APPLICATION OF BP ARTIFICIAL NEURAL NETWORK ON CALCULATING RESERVOIR WATER SATURATION
    HU Jun
    1999, 21(4):  35-37.  DOI: 10.3863/j.issn.1000-2634.1999.04.010
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    Compared with the traditional comprehensive interpretation and digital processing well logging, BP artificial neural network methods have overwhelming advantages and suitability, it requires no well logging interpretation equation based on testing which the traditional interpretation and processing methods does, it needs the original logging and the practical data for solution, only the original logging data is enough in the process of
    the parameter prediction, which provides a new and practical approach to well logging comprehensive interpretation and digital processing for the complicated formations and specials.
    ASPHALTENE PRECIPITATION IN PETROLEUM PRODUCTION
    PU wan-fen
    1999, 21(4):  38-41.  DOI: 10.3863/j.issn.1000-2634.1999.04.011
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    It has been extensively concerned by petroleum workers that the precipitation of asphaltene (solids) and in turn the solids lead to the severe problems in petroleum production, such as equipment plugging and formation damage. This paper gives some views on the mechanism of aspholene precipitation, summaries the analytical methods and the experimental technology
    at present. What is specially presented in this paper is novel art acoustic resonance technology, the art can measure quickly and precisely the onset of asphaltene in light or heavy oil by comparison, which not only simplifies the analysis’s processes,but also improves it’s reliability, and has practical significance for understanding the asphaltene deposition problems during gas
    flooding and other petroleum production. This paper briefly recounts the prevention and removal approaches of asphaltene precipitin too; it has the reference value for averting asphaltene precipitation and remedial treatments of the deposits.
    石油地质勘探
    AN APPLICATION OF STRATIGRAPHIC BASE-LEVEL PRINCIPLE IN SEQUENCE ANALYSIS OF WELL TC2
    SHEN Shou-wen PENG Da-jun YAN Qi-bin et al
    1999, 21(4):  42-45.  DOI: 10.3863/j.issn.1000-2634.1999.04.012
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    Base-level circles and high-frequency sequences for the formations of well tc2 were identified in the light of stratigraphic base-level principle proposed by t. A. Cross. The middle circle fits the sequence, which is indicated by a whole baselevel rising and downward circle, and only the fluvial sequences
    (s11, s12, s13) lack downward circle deposition; the rising circle includes lowstand and water progradation system; the downward circle belongs to high-stand. The results are significant for accurate correlation of sand layers and prediction of reservoirs in the studied area. The three types of parasequence were distinguished in this paper, which are different from the
    concept of classic sequence stratigraphy.
    APPLICATION OF FUZZY CLOSENESS DEGREE IN RESERVOIR RECOGNITION
    FENG Guo-qing LI Yun TAN De-hui
    1999, 21(4):  46-49.  DOI: 10.3863/j.issn.1000-2634.1999.04.013
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    A neural network recognition method is established based on fuzzy closeness degree by combination of non-symmetric closeness degree in mathematics and neural network to overcome deviated interpretation which is resulted from losing information when tactics analysis is conducted by the maximum belonging rules in well logging interpretation. Practical interpretation of
    ling pan oilfield indicates the method will greatly improve the effect of interpretation
    钻采工艺与设备
    EFFECT OF GAS INJECTION RATE ON BOREHOLE PRESSURE IN UNDERBALANCED DRILLING AT LOW PRESSURE
    FAN Jun XIAO Jian-bo SHI Tai-he
    1999, 21(4):  50-52.  DOI: 10.3863/j.issn.1000-2634.1999.04.014
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    Based on the theory of multiphase transient flow, a dynamic model with respect to gas/liquid two- phase flow in borehole was developed, it was also calculated and analyzed the effect of gas injection rate on borehole pressure in aerated drilling in this paper. The bottomhole pressure is not only governed by the gas injection rate, but also closely related to some other factors, including the size of wellbore and drill string,physical properties and circulating rate of drilling mud, etc.The results indicate that only increasing the gas injection rate is not certain to result in decreasing the bottomhole pressure, it
    depends on the balanced relationships between the hydrostatic pressure and flow resistance pressure in the given borehole gas/liquid two-phase fluid. The model and approach may provide some useful help for the different related parameters, the matched compressors, and the design plans in inderbalanced
    drilling.
    A NEW MODEL TO PREDICT TEMPERATURE DISTRIBUTION IN A WELLBORE WHILE DRILLING
    ZHONG Bing FANG Duo SHI Tai-he
    1999, 21(4):  53-56.  DOI: 10.3863/j.issn.1000-2634.1999.04.015
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    The temperature distribution in a wellbore has an important effect on the drilling operation while drilling. On the basis of the studies of previous researchers, this paper presents a new mathematical model, which is solved by finite volume method to predict the temperature distribution in a wellbore during circulation or shut-in in terms of the law of conservation of energy.
    The verification of the simulating results of the model prediction in comparison with the field data was presented. The model can be used to calculate the circulating and shut-in temperature in a wellbore, as well as the temperature distribution of formation around the wellbore.
    EVALUATION of THE PREDICTING METHOD OF TEMPRATURE FOR CONVENTIONAL CEMENTING
    YIN Cheng HE Shi-ming XU Bi-hua et al
    1999, 21(4):  57-60.  DOI: 10.3863/j.issn.1000-2634.1999.04.016
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    It is important for accurate prediction of bottom-hole circulating temperature (BHCT) to be got in drilling, completion and cement slurry design. In this paper, it was compared the downhole circulating temperature of API abroad with the actual testing data at home. The results show that the mean relative
    error exceeds 5 percentage of the conventional predicting temperature, the temperature can be evaluated with different empirical coefficients under arbitrary depth of well, and at any circulating time. Although the method is simple, it can not satisfy the requirement for the drilling and cementing construction. In order to obtain the exact temperature distribution, the researchers should be further to test the downhole circulating temperature, at the same time, to simulate the heat transfer process by computer.
    STUDY OF THE METHOD OF HYDRAULIC FRACTURING OPTIMIZATION DESIGN
    GUO Dali ZHAO Jin-zhou WU Gang et al
    1999, 21(4):  61-63.  DOI: 10.3863/j.issn.1000-2634.1999.04.017
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    The paper considers the two kinds of design idea, based on the predicting hydraulic stimulation effect and the required stimulation treatment scale. 3-D fracture propagation simulation technique was applied for hydraulic fracturing design in the paper, thus it presented the hydraulic fracturing design approach which isthe objective function of the optimal stimulation effect condition based on formation conditions. The optimal plans will be designed by self-adjusting the parameters, such as each wellbore segment fracturing liquid volume, sand proportion, proppant types, and grain diameter, and so on. A 3D
    hydraulic fracturing optimum design software for Windows was developed with Visual Basic Language.
    PSEDOCOMPOSITIONAL MODEL FOR MISCIBLE FLOODING
    ZHANG Lie-hui ZHANG Hong-mei LU You-chang et al
    1999, 21(4):  64-66.  DOI: 10.3863/j.issn.1000-2634.1999.04.018
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    As a usual, compositional model is used to simulate miscible flooding. However, because of its slow calculation and much data difficult to be got, it is not very easy to use by reservoir engineers. So this paper introduces a simulation model for miscible flooding. It is a developed pseudocompositional model based on conventional black oil model, and it has good stability and fast calculation of black oil model, and also has the compositional model characteristic such as simulation of condensate gas reservoir and miscible displacement etc. In addition, the paper presented the mathematical model and the approach to deal with different physical parameters and fluid properties. The model was used to verify the SPE example, it proved to be true.
    STUDY OF ENHANCING EFFICIENCY OF MECHANICAL RECOVERY SYSTEM
    CHEN wen-jun LIANG Zheng ZHOR Dai-yu et al　
    1999, 21(4):  67-69.  DOI: 10.3863/j.issn.1000-2634.1999.04.019
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    According to the actual cases of the low system efficiency of pump unit and under the actual exploitation conditions in Kelamayi Oilfield, the mathematical models of intermittent pumping well was established in the paper. The models include the parameters of the reservoir inflowing, annular testing, and
    pump unit optimizing system, as well as the whole system hardware configuration. It improved the computer management and real - time monitor, and presented an informative approach to improve the system efficiency. It also provides a guidance meaning for exploiting low permeability and production oilfield.
    VALIDITY INVESTIGATION OF COMPONENT TRANSPORT IN ALKALINE FLOODING PROCESS
    WANG Jian JIN Yin-hui LUO Ping-ya
    1999, 21(4):  70-74.  DOI: 10.3863/j.issn.1000-2634.1999.04.020
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    The mathematical model of alkaline - component transport in porous media was established, in which the needed physical - chemistry parameters were expressed as the related functions of flooding agent concentration. Annualized with’Effective Zone’, the mechanism that adsorption, slug size, displacement velocity, dispersion - diffusion influence on validity of alkalinecomponent transport processes is analyzed. Based on these, the validity and durability of NaOH transport in porous media in Daqing Oilfield ASP system were further studied, and the results of the simulator proved to be well concerted with physical simulation results. The simulator can not only replace part of flow experiment and auxiliary mechanism analysis,but also provide a guidance for alkaline and ASP flooding engineering and technology design and dynamic behavior monitoring.

    FAILURE ANALYSIS FOR THE CASING
    LIU Qing-you CHEN Hao　
    1999, 21(4):  75-77.  DOI: 10.3863/j.issn.1000-2634.1999.04.021
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    According to the data casing failure from oilfield, and casing failure as top event, the fault tree of the casing was established in the paper, the model included 47 different essential events. By analyzing the fault tree of casing, 27 one-order minimum cut sets, 29 two-order minimum cut sets and 1 four
    -order minimum cut sets of the fault tree were obtained. The casing failure is collapse, fracture and serious corrosion, finally the paper presents some measures of improving reliability of the casing.
    STUDY OF FREQUENCY CHARACTER OF THE SELFEXCITED OSCILLATION CAVITY AND ITS CAVITY
    RU Da-jun LIAO Rong-qing XIONG Ji-you LU Hong
    1999, 21(4):  78-81.  DOI: 10.3863/j.issn.1000-2634.1999.04.022
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    The self-excited oscillation cavity is the device that produces pulse jet. After it had been applied to the petroleum industry, great profit has been obtained. UP to now, little has been known about its structure character in order to make it work efficiently, it is necessary further research it. Therefore the characteristics of the inherent frequency and the relations with related parameters were analyzed in this paper. The theoretical formulas were verified by experiment. A new kind of cavity design method to the 4 1/2”mono-cone bit and 5”diamond bit installed the self-excited oscillation cavity were provided in this paper. At the same time, some fundamental studies for the fluid flow law and computer simulation were also accomplished.

    ELASTO-PLASTICAL DYNAMIC ANALYSIS OF EXPLOSIVE AUTOFRETTAGE
    ZHAN Ren-rui TAO Chun-da ZHAO Guo-zhen et al
    1999, 21(4):  82-85.  DOI: 10.3863/j.issn.1000-2634.1999.04.023
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    Based on the explosive pressure curve, dynamic mechanical property and constructive relationship of 43CrNiZMoVA steel which were tested with Hopkinsion bar equipment, the explosive autofrettage of thick - wall cylinder with nonlinear finite element method was analyzed in this paper. Under different explosive pressure, the change rule of the stress, displacement,
    velocity of different position and the size of plastical zone versus the time were obtained. Finally, the residual stress resulted in explosive autofrettage with Sachs method was measured, and the residual stresses of explosive autofrettage were compared with that of hydrostatic pressure.

    FINITE ANALYSIS OF PLUNGER-SEAL PAIR IN FRACTURING PUMP
    ZHU Wei-bing ZHOU Xi-rong PENG Xiao-dong
    1999, 21(4):  86-88.  DOI: 10.3863/j.issn.1000-2634.1999.04.024
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    Based on the finite element method, the contact stresses of the plunger- seal pair of OPI - 1800AWS fracturing pump were discussed in detail. The paper presented distribution law of contacting stress between plunger and rubber seal ring, and also analyzed the relationships between contacting stress and working pressure. Under the action of working medium pressure, it indicates the“centripetal effect”in rubber seal ring exists. ie., along the contacting length of seal ring, the lip of seal ring is extended, the root of seal ring is compressed, and the main sealing region is near the lip. At the same time, the position of the main seal region does not vary with the medium pressure,
    and the ratio of the maximum contacting pressure to the working medium pressure is 1.23. Finally it provides the theoretical support for the analysis of lubrication and seal mechanism.
    化学工程
    ANALYSIS ON THICKENING PROPERTY OF N-ETHYL (α-CYCLOHEXANOME) ACRYLAMIDE COPYLYMER
    XU Peng TANG Shu-zhong ZHAO Ji-kuan et al
    1999, 21(4):  89-91.  DOI: 10.3863/j.issn.1000-2634.1999.04.025
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    A bydrophoic monomer N- ehyl- (α- cyclohexanone) acrylanide (NECHAM) and its copolymer wity acrylanide (PNECHAM-AM)have been prepared. The copolymerization conditins in water solution have been determined. The viscosities of this copolymer solution were measured separately in ion exchange water, standard salt water and oil-water mixture.
    Results has shown that the viscosities of the coplymer have increased obviously. Apreliminary theory analysos was present in this paper.
    RECOVERY AND UTILIZATIN OF SILVER SALT FROM SILVER-BEARING WASTE LIQUID
    CHEN Ji YIN Zhong ZAO Xiao-tong et al
    1999, 21(4):  92-94.  DOI: 10.3863/j.issn.1000-2634.1999.04.026
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    Chloride ion(Cl-) and CODCris often determined by using of expensive silver salt such as AgNO3or Ag2SO4. A simple and practical method of recovering silver salt from silver-bearing waste liquid has been discussed. in which the silver was separated and enriched by using setting method (pH≈3), the metal
    silver was produced by Fe-Cu reduceing method, AgNO3was prepared by H2O2-HNO3method, and Ag2SO4was prepared by (NH4)2SO4or H2SO4method. Results have shown that the pureness of the recovered silver slt is up to 99 % and the cost of measuring Cl-and CODCris decreased.
    DEVELOPMENT OF C1~C7LIGHT HYDROCARBONS SEPARATOR
    WANG Hai-qing DAI Hong-ming WANG Shun-yu et al
    1999, 21(4):  95-98.  DOI: 10.3863/j.issn.1000-2634.1999.04.027
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    Distilling analysis method is often used in C1~C7light hydrocarbon of crude oil. It easily results in hydrocarbon loss and analysis accuracy reduction. A method of“increasing temperature evaporation”was used to analyze C1~C7light hydrocarbon, which did not need liquid nitrogen,reduced the cost of analysis and inhanced the reliability of analyzing each monomer hydrocarbon. This paper has given a minute description in the development of light hydrocarbon separator,experimental procedure,qualitative and quantitative analysis condition of evaporative hydrocarbon gas chromatography.
    STUDY ON IMPROVING THE RECOVERY OF NATURAL GAS LIQUIDS IN MOXI
    LU Kai-he BAI Jian ZHU Lin et al
    1999, 21(4):  99-100.  DOI: 10.3863/j.issn.1000-2634.1999.04.028
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    Several measures were present to increase recovery ratio of natural gas liquids (BGL) without changing present device in a large scale.Heat transfer effect was improved by increasing the areas of heat exchanger. Expansion ratio of expander was raised by increasing pressure on unstripped gas. The regenerating furnace worked wel by replacing its internal tubular goods. Results have shown that the recovery ratio is increased 50 % than before.

    经济管理
    TON MARKING TACTICS OF NGV
    YONG Qi-tong XU Zhi-gang DONG Xiao-wen et al
    1999, 21(4):  101-103.  DOI: 10.3863/j.issn.1000-2634.1999.04.029
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    Most of the oil fields in china have reached the mid-late stage of production. The obviously decreasing recoverable reserves of the remaining oil and gas, the considerably increasing cost per tone and the dropping of oil price in international markets seriously impact the economic efficiency of the industry.
    Therefore, what is the much more important to oil fields is to look for new growth point of economy, besides strengthening the control of cost, enhancing investment in science and technology, quickening the modern enterprise system contraction,the future research key point will be quickening up the development of natural gas industry and opening up natural gas market.This article mainly discussed the advantages, marketing tactics
    and operating ways of NGV. It is pointed out that we should exploit the mutual complementary ability of government behavior and market behavior to develop the market of NGV. As for the operating method, we should have an elaborate division of market and the corresponding target market according to the requirement, types of users, situation of user and characteristics of products. A case study is delivered from oil filed t re development of NGV.