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    20 November 1995, Volume 17 Issue 4
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    石油地质勘探
    Sinian—Ordivieian Dithfaeies PaleogeograPhy of Tarim Basin
    Zheng Jia-feng Mu Shu-guang
    1995, 17(4):  1-5.  DOI: 10.3863/j.issn.1000-2634.1995.04.001
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    Tarim basin is a composite basin with multiple cycles. As the first set of sedimentary cover on the basement，Sinian，Cambrian and Ordivician systems are charaeterized by great thickness and abundant sedimentary types. Lithofacies paleogeographic environment stretches from seastrand to deep sea. Basing on the outcrop seetion，drilling data and the analysis of
    carbon-oxygen isotope，trace element， geoehemistry and palaeontology，the feature and distribution of lithofacies paleogeograpic environment in Sinian，Cambrian and Ordivieian periods are analyzed in this paper.

    Study of Geoehemieal Charaeters of Formation Water in Fuyang FM in Northern Songliao Basin
    Huang Fu-tang
    1995, 17(4):  6-13.  DOI: 10.3863/j.issn.1000-2634.1995.04.002
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    Basing on the chemical analysis data of formation water in Northern Songliao Basin，this paper studies the Physical-chemical properties，composition character and cause type of formation water of Daehengzi and Fuyang in Northern Songliao Basin. And explores the plane dividing area of water chemical field and the relation between vertical dividing belt and oil-gas distribution.

    Applieation of Microseismic Facies Analysis in the Study of Sedimentary Facies
    Zhu Shi-jun Huang Ji-xiang
    1995, 17(4):  14-19.  DOI: 10.3863/j.issn.1000-2634.1995.04.003
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    Sedimentary rock layers are always characterized by a particular seismic response. Therefore, the lithological information can be gained from seismic reflection waves. According to the combination relationship between amplitude,frequency and wave shape of seismic reflection waves,the lithologic characteristic can be predicted by means of microseismic facies analysis and the law of lithofacies change can be explained from a macroscopic angle. Therefore the purpose to divide and describe the sedimentary facies can be achieved by geological method. The examples show that this method is quite feasible.
    On Horizontal Shear Stress Control over Large Fracture System
    Jiang Zi-ang Xiong Ying
    1995, 17(4):  20-28.  DOI: 10.3863/j.issn.1000-2634.1995.04.004
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    Basing on the principles of geomechanics and rock texture mechanics, this paper discusses the important role of horizontal shear stress in the formation, transformation and distribution of large fracture systems and its physical model. The paper holds that a large fracture system is the product of a larger straight press type fracture network and a shear type fracture network, and is mainly distributed over the zone on which horizontal shear stress and straight press stress jointly act. Horizontal shear stress is the most important factor of transformation and controling the incongruity of large fracture network strueture.So it provides new patterns of forming reservoirs and theoretical basis for researching and finding relatively large concealed fracture system.

    The Study of RFT in the Evaluation of Reservoir Permeability
    Yan Jun Sun Jia-xu Zhu Shi-jun Han Jun-xia
    1995, 17(4):  29-33.  DOI: 10.3863/j.issn.1000-2634.1995.04.005
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    The formula of evaluating the permeability of Repeat Formation Tester can be gained theoretically by using the spherical model of pressure resumption. With the actual data from Lunan oil field of Tarim Basin, the characteristics of permeation during oil reservoir exploitation are comprehensively evaluated. As the result, the application of RFT has expanded.

    The study of Oil-Gas Cover and Well-Logging Geology in Hailaer Basin
    Liu Wen-bi Li De-fa Zhou Wen
    1995, 17(4):  34-42.  DOI: 10.3863/j.issn.1000-2634.1995.04.006
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    This paper comprehensively studies the response characteristic of well logging of all kinds of mudstone covers; collects large amount of information; and obtains oil-gas covering parameters by using mathematical statistics and logging data processing.This paper first presents，of the basis of the parameters as well as the microcosmic analytical data，some cover-classifying parameters and classifing gauge，makes an systematic classifying assessment for oil-gas covers in Hailaer Basin，and points out the favorable layers for oil gas preservation.

    Fracturing Prediction of High-Pressure,Tight,Low-Saturated and Thick-Layered Pool
    Cao Guo-xi
    1995, 17(4):  43-50.  DOI: 10.3863/j.issn.1000-2634.1995.04.007
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    Basing on the practical situation of Maxi oil field and the analysis of geological characteristics and mathematical statistics of fracturing technology of its B2 layer, this paper presents a mathematical model of average daily fracturing production, effective days, cumulative oil recovery of high pressure, tight, low saturated and thick layered pool.This model is of importance to the prediction of increasing production of fracturing.

    油气田开发
    The Principle of Wellface Mechanical Stability and Its Influence Factors
    Liu Xiang-jun
    1995, 17(4):  51-57.  DOI: 10.3863/j.issn.1000-2634.1995.04.008
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    Basing on the analyses of the linear-elastic wellface mechanical stability in a vertical well, this paper makes a comprehensive and profound analysis of the principle of wellface mechanical stability and its influence factors. The results show that the persent wellface mechanical stability models and strength criteria are rather limitative. Therefore it is imperative to seek for more effective solutions.
    A Prediction Model for Quasi-Momentary State Well Fluctuation Pressure
    Zhou Kai-ji Zhong Bing Yuan Qi-ji Liu Ping
    1995, 17(4):  58-64.  DOI: 10.3863/j.issn.1000-2634.1995.04.009
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    Basing on the sensitive analysis of the influence factors in the prediction model of well momentary fluctuation pressure,and the study of well fluctuation pressure and the actual measurement of a full size well, a new prediction model is proposed to predict “the momentary state processing steady state” of the well fluctuation pressure. The model takes into account the influence of fluid compressibility, flow channel elasticity, the empty bottom hole distance under the moving pipes and their longitudinal strain and inertial force.The model can prediet the actual fluetuation pressure value more accurately than the now widely used steady state model，which will be helPful to the scientific hole structure design，the determination of drilling fluid density and the control of the complex problems in a hole.

    The Development of Polymer In-Situ Gelling Modifier and Its Application
    Ye Zhong-bin Liu Ji-wei
    1995, 17(4):  65-71.  DOI: 10.3863/j.issn.1000-2634.1995.04.010
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    In the light of the practical conditions of the two wells, an injection profile medifier bas been developed, which has the properties of in situ gelation and adjustable gelation time. A system evaluation has been given to its properties in laboratory through core flooding experiment, and the measurement of gelation time in porous media has been proposed. A good result has been achieved in the in situ modification operation. Thus the oil production increased and the injectivity profiles of the injection wells greatly improved after the modification.

    Performance Prediction of 3 D Percolation after Oil Wells Being Acid Fractured
    Fan Xue-ping Huang Jian-min Wu Hong
    1995, 17(4):  72-79.  DOI: 10.3863/j.issn.1000-2634.1995.04.011
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    This paper makes a comprehensive analysis of the factors that affect acid fracture productivity, such as production pressure drop, non Darcy effect, reservoir pollution,fracture size and the conductivity change along the fractures, etc, derives and establishes the performance prediction model of 3-D acid fractured well production. Simulation calculation shows that fracture closure stress and rock embedment strength are important factors influencing acid fracturing suitability, and non Darcy effect, reservoir pollution and fracture closure strength will reduce the produetion of wells.However the fracture size and conductivity designed optimumly and resonably will increase the production.
    Object-Oriented Expert System and Its Study in Reservoir Protection Intelligent System
    Dong Hai-feng
    1995, 17(4):  80-85.  DOI: 10.3863/j.issn.1000-2634.1995.04.012
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    In this paper the object oriented technique is applied to the design of an expert system and the realization of object oriented knowledge representation and object oriented reasoning are discussed with reference to the design of oil gas reservoir protection expert system in oil drilling engineering. The software realization of development environment is also described.

    石油机械工程
    The Computer Simulation Model of Three Roller Cone Bit
    Zhou De-sheng Ma De-kun
    1995, 17(4):  86-92.  DOI: 10.3863/j.issn.1000-2634.1995.04.013
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    In this paper, the teeth on bit are put in the coordinate system easy to describe. The space position shift of teeth are realized by means of coordinate shift. Based on the geometry and kinematics of roller cone bits, the computer simulation model of roller cone bits is set-up which can actually reflect the shapes, sizes and the relative positions of the teeth on bit during the bit drilling process. The study is one of the key problems of simulation research of bit rock interaction as well as the foundation of analyzing the working behavour of roller cone bits.
    Development of Automatic and Air-Driven Boost Device for Chamber of Drilling Pump
    Feng Bing Meng Kun-lu Zhang Ping et al.
    1995, 17(4):  93-97.  DOI: 10.3863/j.issn.1000-2634.1995.04.014
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    This paper expounds the practical significance of the development of automatic and air driven boost device for air chamber of drilling pump, the design philosophy and the determination of the design proposal,and discusses the working out of the major parameters. The development of automatic and air driven boost device for air chamber of drilling pump will provide reliable assurance for the normal working of drilling pump and safe and high quality drilling.

    Preliminary Research on Aluminum Sucker Rod in Deep Well Pumping
    Hu Yong-quan Wu Zhi-jun
    1995, 17(4):  98-103.  DOI: 10.3863/j.issn.1000-2634.1995.04.015
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    It is an effective way to enhance or recover oil production by increasing the pump setting depth. An assumption is put forward by a western oil field of our country to solve the overload of the horsehead, the over torque of the crank and the over stress of the string by using aluminium sucker rods instead of steel rods in deep well pumping. In this paper, the formula of setting depth of taper rods is derived according to the theory of pumping rod design, and a contrast analysis is made about the calculation result under a series of different technological parameters，Besides the preiiminary study of the feasibility is conducted that aluminium rods are used in deep well pumping.

    Synthesis of Monomer of N N-Dimethyl Hydroxyethyl acrylamide and the Preparation of Its Cationic Copolymer with Acrylamide
    Tang Shu-zhong Hu Xing-qi Ma Xi-ping Xu Dong
    1995, 17(4):  104-109.  DOI: 10.3863/j.issn.1000-2634.1995.04.016
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    This paper describes the preparation of N N dimethyl hydroxyetbyl acrylamide (DMAPA) with acrylamide, epicholorohydrin and dimethylamide by their non symmetrical condensation reaction and the synthesis of cationic copolymers of different cationic degree by its radical copolymerization with acrylamide in aqueous solution. Besides the cationic nitrogen in copolymer is verified with IR spectrum and the clay stabilizing and floculating properties of the copolymer are evaluated. The experiments show that copolymers of different cationic degree and molecular weight have good applied properties.

    石油化学工程
    Solubilities of Gypsum (CaSO42H2O) in Acidizing Process of Carbonate Rocks
    Yin Zhong Zhao Xiao-dong
    1995, 17(4):  110-113.  DOI: 10.3863/j.issn.1000-2634.1995.04.017
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    The solubilities of gypsum in carbonate rock acidizing process are measured in the experiments at different temperature and in different media. The change law of gypsum solubilities is discussed and the method of increasing the solubility of gypsum is presented by adding CaCl2 in the acidizing process to produce plasma effect.

    Laboratory Study of Treating Oily Sewage by Hydrocycline Technology
    Zhu Lin Wang Bing Zhang Feng
    1995, 17(4):  114-118.  DOI: 10.3863/j.issn.1000-2634.1995.04.018
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    This paper studies the problem that the separtion efficiency of a hydrocyclone is influenced by feed volume, feed oil concentration, overflow volume, density difference and temperature by using the self made hydrocyclone. The hydrocyclone has treated the refinery sewage. The study shows that suitable operation conditions can improve the separation efficiency of a hydrocyclone.

    基础学科及其它
    The Water Cone Problem of a Horizontal Well in Bottom Water Reservoir
    Guo Da-li
    1995, 17(4):  119-123.  DOI: 10.3863/j.issn.1000-2634.1995.04.019
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    Basing on the assumption of fixed streamline, this paper studies the water cone problem of a horizontal well in bottom wate reservoir when water is injected into the bottom.The analytical solution of the quacilinear hyperbolic partial differential equation for the two dimensional flow of the two phase fluid has been obtained by using the method of characteristic. The generation and development of a water cone as well as the whole water out process of the horizontal well have been presented. This paper may be regarded asthe popularization of the famous Buckley-Leverett Theory under the condition of two dimension.

    Nonlinear System Identification Based on Artificial Neural Network
    Lin Wan-chang Rin Jun Li Ming Huang Xue-jia
    1995, 17(4):  124-128.  DOI: 10.3863/j.issn.1000-2634.1995.04.020
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    The artificial neural network (ANN) is a nonlinear dynamical system with the advantages, such as self adaptation, self organization and self learning. Basing on the fact that the artificial neural network has the ability to express any nonlinear mapping, this paper makes a system identification of nonlinear system. The simulation result obtained shows that the method is feasible and the calculation is precise.