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    20 November 1996, Volume 18 Issue 4
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    石油地质勘探
    Prediction of Formation Fracture Pressure Based on Grey Artificial Neural Network Logging
    Xia Hong-quan TAN De-hui et al
    1996, 18(4):  1-8.  DOI: 10.3863/j.issn.1000-2634.1996.04.001
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    Of the mew information processing techniques, both grey mode and artificial neural network mode can be used to solve the problems of pattern- recognition and parameter calculation in fine log interpretation and reservoir description. On the basis of GM(U,N)mode and BPANN mode, this paper introduces an improved method (GMUNBPANN) to estimate parameter, and then analyzes the feasibibity of formation fracture pressure prediction by using well logging data. Taking the central gas field in H basin as an example, we have built a special grey BPANN mode to calculate the rock fracture pressure of Ahihezi andd Majiagou formation by making full use of test data and log information, and applied it successfully to 25 oil-gas wells. The result shows that this method is easy, practical and can make an accurate prediction, thus providing a new approach for the prediction of formation fracture pressure from well logging curves.
    Diagenesis and Reservoir Distribution of Upper Jurassic Series in Zhangqiang Hollow
    Zeng Wei
    1996, 18(4):  9-14.  DOI: 10.3863/j.issn.1000-2634.1996.04.002
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    The clastic rock of Upper Jurassic Series is a low mature litharenite. Many diageneses have happened in reservoirs. The diageneses which decrease the porosity of reservoirs are compaction, cementation of calcite, zeolite, illite and chlorite. The diagenesis which increases the porosity of reservoirs is corrosion. There are five diagenetic sequences and facieses in reservoirs. The diagenetic facies of chlorite cement has the highest porosity of all the facieses. Diagenetic facieses are correlated with sedimentary facieses, diagenetic periods and maximum burial depth. Since reservoirs are decided by diagenetic facieses, reservoirs can be accurately forecast by them.

    Wave Field Simulation Method of Effect of Reservoir Parameters on Seismic Wave Propagation Characteristic
    Shi Yu-mei Xie Gui-sheng
    1996, 18(4):  15-18.  DOI: 10.3863/j.issn.1000-2634.1996.04.003
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    In this paper, through the numerical simulation of the seismic wave field in reservoirs, we have quantitatively discussed how the porosity,permeability and viscosity of reservoirs affect the amplitude and velocity of wave propagation in reservoirs, which has laid a foundation for the later quantitative study of the relationship between the reservoir parameters and the seismic wave propagation characteristics.
    油气田开发
    Study of Damage of Cement Slurry to Formation
    Guo Xiao-yang LIU Chong-jian YU Ping-fang
    1996, 18(4):  19-27.  DOI: 10.3863/j.issn.1000-2634.1996.04.004
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    On the basis of the hole-buttom model experiment, this paper studies the damage of mud and cement slurry to foemation. The study shows that the damage of mud is more serious than that of cement slurry. Since the aggressive quantity of cement particles and filtrate is limited by the percolation properties of inner and outer mud cakes and rock core, the damage of cement slurry to formation is therefore decresed. The damage in the area 122 cm inside the wellface is resulted mainly from plugging of grain, while the damage to the formation 2 cm away from the wellface is resulted from the precipitates of filtrate of cement slurry. This paper also analyzes the pollution depth, the filtrate composition, the quantity of precipitates, and the separation sequence.
    　

    Establishment of Mathematical Model for Hydraulic Fracture 3D Propagation and Determination of Proppant Injection Schedule
    Liu Shu-zhi Ren shu-quan
    1996, 18(4):  28-35.  DOI: 10.3863/j.issn.1000-2634.1996.04.005
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    The fracture created in reservoirs by hydraulic fracturing will propagate in three directions of length, width and height. Consequently , in order to improve the design of hydraulic fracturing and assure successful operation, a mathematical model for hydraulic fracture three dimensional propagation is presented in the paper. The model takes into account the effect of the heat transfer in the wellbore and fractures during fracturing fluid injection on fracture geometry. On the basis of this, and according to the fracture conductivity needed by each segment of fracture, this paper determines the in-situ area sand concentrations for each segment and the sand ratio of the corresponding surface injection segments.

    Optimum Selection of Full-Size Pulsed Jet Nozzle
    Yang Xiu-fu Liao Rong-qing
    1996, 18(4):  36-38.  DOI: 10.3863/j.issn.1000-2634.1996.04.006
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    In order to attain the proper size matching the oscillating cavity of the full-size pulsed jet nozzle, this paper, having made an optimization of the full-size pulsed jet nozzles, obtains the four optimum matching sizes. The power of the optimum full-size pulsed jet nozzle is 1.5 times that of the ordinary ones of the same size. The washing sand brick experiments show that the above optimum study is reliable.

    Characteristic of Drilling-Fluid-Polluted Reservoir in Horizontal Well Drilling and the Protective Game
    Li Jian Yang liu Zhang jian
    1996, 18(4):  39-42.  DOI: 10.3863/j.issn.1000-2634.1996.04.007
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    The paper expounds the characteristic of polluted reservoir resulted from horizontal well drilling, introduces the damage evaluating method with flow experiment, and presents the selecting principle of drilling fluid in horisontal well drilling.
    Study on the Determination of Formation Invasion and Damage Depth by Long Core Experiments
    Chen Ke-qui Chen Fu-xuan et al
    1996, 18(4):  43-46.  DOI: 10.3863/j.issn.1000-2634.1996.04.008
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    This paper briefly introduces the basic principle and experimental procedure of the determination of oil-bearing formation damage by long core experiment, analyzes the method of the determination of formation invasion and damage depth by the long core experiment, and points out, through the analysis of the experimental data, that the invasion depth of mud filtrate is greater than the damage depth of mud filtrate in formation, and that the damage of filtrate to formatin is less than that of mud particles.
    The Application of Well Supervisory Control in Oil Field Automatic System
    Wang Jie Fan min et al
    1996, 18(4):  47-51.  DOI: 10.3863/j.issn.1000-2634.1996.04.009
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    In recent years,oil field automation has come into wider use in China. The well supervisory control is a very important part in oil field automatic system. According to the development plan of the oil field, the production method is different at different stage. Therefore, the requirements of the well supervisory control are different too. The proper design and use of the well supervisory control system are beneficial to the automatic production and automatic management of the oil field. This paper introduces the structure, development and characteristic of the well supervisory control system. It also introduces several well supervisory control systems, the remote shutdown and safety system of the well. In addition, it discusses the problems relevant to the application of the well supervisory control system.
    Discussion of Enhanced Recovery Technology for Weiyuan Gas Field
    Huang Xian-zong Wen ming et al
    1996, 18(4):  52-56.  DOI: 10.3863/j.issn.1000-2634.1996.04.010
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    This paper first introduces the basic features, recovery history and existing problems of Weiyan Sinian gas reservoir, and then discusses the causes of these problens and the possible solutions to them. Finally an outline of Overall harnessing technologies of enhancing recovery for the gas field is worked out. This paper concludes that through overall harnessing, it is possible for the gas reservoir to have a stable production in a long term.
    Mathematical Model of Wellbore Hot Fluid Circulation and Its Analytical Solution
    Zhao Gang Ma Yuan-le Lu gang
    1996, 18(4):  57-61.  DOI: 10.3863/j.issn.1000-2634.1996.04.011
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    Wellbore hot fluid circulation is a practical technology suitable for the production of high pour-point and high viscosity oil. Its mathematical model is a normal differential and non-linear equation group under the condition of half-consealed edge. The common way of target or conjugate function is not suitable for the solution of this equation group. However, we obtained its analytical solution during the research. The problem of the application of parameter processing and program designing are discussed. This method can be used in project designing of oil field development and the feasibility study of applying the low-temperature heating nuclear to oil fields.

    Sudy of Development plan for Natural Gas of Strippled Wells in chuan Gas Fields
    Tang Xiao-dong Meng ying-feng et al
    1996, 18(4):  62-66.  DOI: 10.3863/j.issn.1000-2634.1996.04.012
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    view of the fact that the gas of the stripped wells has not been developed, this paper presents a preliminary sibility plan of its development and utilization by adopting the techniques of solid desulfurizing agent(SDA), ssureswing absorption (PSA), absorption natural gas (ANG) and natural gas vehicle (NGV). Through lysis, evaluation and comparison, it is considered practical and feasible to store and transport the gas in steel inders after it is purged and absorbed by a skid-mounted gas purification plant. The gas can be used fuel for icles and in daily life, and as a fuel of vehicles, it has great benefiits in economy, society, and environmental tection.

    石油机械工程
    Pecise Calculation and Analysis of Working Angles of PDC Cutters
    Li Shu-sheng Ma De-lun et al
    1996, 18(4):  67-72.  DOI: 10.3863/j.issn.1000-2634.1996.04.013
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    Acording to the characteristics of PDC bit cutting process and the relevant metal cutting theory, this paper gives ercise definition of working angles, i.e. actual backrake and actual siderake of PDC cutter, derives their urate calculation formulas, and analyzes the law of the effects of structural parameters on them, which is of at importance to the design, cutting force calculation and performance perdiction of PDC bits.

    Estimation of the Fatigue Life of Autofrettaged Equipment with acks
    Tao Chun-da ZHAN Ren-rui
    1996, 18(4):  73-76.  DOI: 10.3863/j.issn.1000-2634.1996.04.014
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    Paper analyzes the expression of stress intensity factor of thick-walled cylinder with cracks, and points out t Newman-Raju s solution of free-surface influence coefficients is the optimum expression of calculating the of fatique crack propagation of thick-walled cylinder. At the same time, this paper indicates that the life of que crack propagation can be greatly increased by autofrettage, and the longest life will be got when the ipment is autofrettaged by 100 % over strain degree.

    Prediction of Casing Damage through Sequential Fussy Synthetic aluation
    ZHANG xiao-yu ZHANG Xian-pu et al
    1996, 18(4):  77-80.  DOI: 10.3863/j.issn.1000-2634.1996.04.015
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    It is very difficult to diagnose the downhole condition and predict the casing failure or damage, which is caused by h factors as unclear circumstances around the wellhole, unknown loads to casing, complicated failure chanism, fuzziness of many factors, fuzzy relation between cause and effect of casing damdge, etc. On the is of analysis of these factors, this paper establishes a model to deal with the fuzzy relation, and presents a new thod—sequential fuzzy sythetic evaluation (SFSE), which can predict the down-hole condition according he given data of the well and the field. This method provides a new way for the prediction of the service-life ownhole casing.
    Study of Recondition Technology of Deep Well Pump Plunger
    Bai Li-ming
    1996, 18(4):  81-85.  DOI: 10.3863/j.issn.1000-2634.1996.04.016
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    Bead weld, thermal spray coating, electroplating and brush-plating are the main recondition techniques of the metal parts in mechanical equipments. Through the analysis and comparison of the four recondition techniques of metal parts, and in consideration of the failure features of the plunger of the well pump used in a heavy oil well, this paper comes to the conclusion that brush-plating is an optimum method of reconditioning the plunger, and presents the brush-plating technological process and its parameters.

    油气化学工程
    Gemeral Programming for Calculation of Chemical Thermodynamics
    RAO Xiao-tong WANG xu YIN zhong
    1996, 18(4):  86-90.  DOI: 10.3863/j.issn.1000-2634.1996.04.017
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    This paper introduces a general programming method to simplify the calculation peoblem of chemical thermodynamics. After the relevant thermodynamic data have been written into the random data file, the computer can finish all the calculations needed in looking for the data and selecting acccording to the menu just by inputting the chemical reaction equations.
    　
    管理科学、基础科学
    Multiobjective Linear Pregramming Model for Oilfield Recovery System and Solution with AHP
    XIAO Wei LIU zhi-bin
    1996, 18(4):  91-96.  DOI: 10.3863/j.issn.1000-2634.1996.04.018
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    This paper sets up a multiobjective linear programming model (MLPM) for the oilfield recovery system. In view of the characteristics of MLPM in oil engineering and the gap between the theoretical solution and its actual application, we present a method of solving MLPM with the analytic hierarchy process (AHP)—weighted conversion method.

    Genrealized Predictive Control of Resisting Non - Stationary Disturbance
    LIN Wan-chang;REN Jun et al
    1996, 18(4):  97-99.  DOI: 10.3863/j.issn.1000-2634.1996.04.019
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    This paper improves the generalized predictive controller proposed by D. W. Clarke et al, and presents a generalized predictive controller which resists non-stationary disturbance. The simulation shows that this type of controllers have wide adaptability, good tracking performance and strong robustness.

    Application of Dbase in Thermokinetics Study
    LI Huai
    1996, 18(4):  100-102.  DOI: 10.3863/j.issn.1000-2634.1996.04.020
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    This paper discusses the application of dbase in thermokinetics study, establishes the data bases for thermogram, dimensional parameter function and A/D conversion rate, and presents the corresponding operating software.
    The Data Locking Mechanism of Netware and Its Application
    YAN Yong-sheng
    1996, 18(4):  103-106.  DOI: 10.3863/j.issn.1000-2634.1996.04.021
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    In this paper, we discuss in great detail the data looking mechanism of Netware, and present the design method of Netware application program.

    Two Sufficient Conditions for a Finite Group as BpGroup
    TU Dao-xing
    1996, 18(4):  107-109.  DOI: 10.3863/j.issn.1000-2634.1996.04.022
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    Let G be a finite group, and let be a set of primes. A subgroup H of G is calledπ-S-quasi-normal in G if H is permuted with every Sylow p-subgroup of G for every p inπ. G is called a Bpgroup if the existence of normal p-complements of N (P) implies that G itself as a normal p-complement, where PE Sylp G . In this paper, we have proved that G is a Bpgroup if G satisfies one of the following conditions: (1) each maximal subgroup of a Sylow p-subgroup P of G is P’-S-quasi-mormal in G ; (2) each second maximal subguoup of a Sylow p- subgroup P of G is p’-S-quasi-normal in G .