Journal of Southwest Petroleum University(Science & Technology Edition)

THE RELATIONSHIP OF PORE THROAT SIZE WITH POROSITY AND PERMEABILITY OF ORDOVICIAN CARBONATE RESERVOIR ROCK OF THE CETRAL GAS FIELD OF SHANGANNING BASIN

Liao Mingguan Fu Xiaowen

1995, 17(1): 1-7. DOI: 10.3863/j.issn.1000-2634.1995.01.001

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In this paper,based on the present mercury-injection test samples,we establish,by using the pluralistic regression analysis method,the experimental formulas that express the relationship of pore throat size with porosity and permeability at different mercury saturation degrees of different Ordovician reservoir rocks of the centural gas field in Shanganning basin.This method is likely to be used to predict the capollary pressure curves and the size and distribution of pore throat of the sample with the conventinal core analysis data.

Determination of Hydrocarbon Trap Boundary by Follow-well Track Method

Zhang tianlun Zhang Bailin

1995, 17(1): 8-24. DOI: 10.3863/j.issn.1000-2634.1995.01.002

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The follow-well track method presented in this paper is a field working method of the triode-gradient method. A large number of water-bath analog experiment results show the determination of the hydrocarbon trap short-axis boundary, while its long-axis boundary will have to be determined by the follow-well track method. and so will the equal-axis hydrocarbon trap boundary. This method can also be used in the vertical prediction of hydrocarbon trap and its development monitoring.

Determination of Distribution Scope of Field TZ Well O8 Hydro-carbon Zone B by Fisher Type-Two Discriminant Analysis

Mu Zhonghai Jiang Yuqiang

1995, 17(1): 25-33. DOI: 10.3863/j.issn.1000-2634.1995.01.003

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This paper collects 20 types of seismic parameters of the wells in the field Tz from the 3D deismogram, and establishes the discriminant function of oil-gas well and dry well by Fisher type-Two discriminant analysis. This paper also predicts the distribution scope of Well 08 hydrocarbon Zone B by discriminant critical value, and judging from the results, the prediction is quite satisfactory.

Solution of Elastic Wave Equations on Fluid-Saturated Porous Media-the Pseudospectral Method

Shi Yumei

1995, 17(1): 34-37. DOI: 10.3863/j.issn.1000-2634.1995.01.004

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In this paper, we provide a numerical method for the solution of elastic wave equations in fluid-saturated porous media, and derive its calculation formula. Using thes formula, we simulate the wave propagation in a fluid-saturated media model with one reflection plane,the result of which is corresponding to Biot's theoretical prediction.

Theoretical Study of Steady-State Surge and Swab Pressure in Eccentricc Annulus

Zhong Bing Zhou Kaiji Zie Ginghua

1995, 17(1): 38-45. DOI: 10.3863/j.issn.1000-2634.1995.01.005

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This paper analyzes the surge and swab pressures produced by the pipe running in the eccentric annulus, and derives the calculation formula of steady-state pressures of powerlaw fluid in eccentric annulus. The study provides the reliable theory and method for the design of hole structure and the control of the pressures in inclined and horizontal wells. The calculation charts of relevant parameters are also given for the convenient use in the fields.

Study on the Bottom Hole Pressure Properties of the Oscillating Pulse Jet-Nozzled Bit

Xiong Jiyou Liao Rongqing Chen Dejie Sun Wentao

1995, 17(1): 46-50. DOI: 10.3863/j.issn.1000-2634.1995.01.006

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Basing on the measurement of axial percussive pressure of nozzle jet, this paper investigates the effective jet distance, the jet pulse property, and the bottom hole pressure destribution of the oscillating-pulse jet-nozzled bit. The results show, under the same conditions, that the effective jet distance of pulse-jet nozzle has been raised by 150 %, and pulse amplitued by 170 %, compared with those of 3 common jet nozzle. Therefore the bottom hole pressure distributions is more advantageous to the removal of bit cuttings.

Structure Features and Physiochemical Properties of Naduzu Shale of Huacha, Nakun Area in Bese Basin

Huang Jinjun Luo Xinshu Cui Maorong

1995, 17(1): 51-55. DOI: 10.3863/j.issn.1000-2634.1995.01.007

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Well-bore collapse in Naduzu shale has been the peimary factor that interferes the drilling in Huacha, Nakun area in Bese Basin, Guangxi. This paper focuses on the mineral content, pore and fissure configuration and the physiochemical properties of Naduzu shale,and provides scientific basis for researching the unstable factors of the well section in Naduzu, and the effective measures of preventing well collapse.

Experimental Study of Temporary Plugging Acidization

Zhao Liqiang Zhong Shuangfei Pan Qingchuan Chen Jimei

1995, 17(1): 56-62. DOI: 10.3863/j.issn.1000-2634.1995.01.008

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This paper presents an experimental study method of temporary plugging acidization,and gives an experimental analysis of the oil-solubility, particle destribution of the temporary plugging agent, and its stability in acid fluid and the compatibility of temporary plugging agent with acid fluid. Using a specially designed temporary plugging acidizing experimental apparatus, the paper respectively studies the temporary plugging efficienccy of the temporary plugging agent, the unplugging efficiency in produced which is worth popularizing.

Application of Hybrid Grid in Horizontal Well Reservoir Numerical Simulation

Zhang Liehui Li Yun

1995, 17(1): 63-69. DOI: 10.3863/j.issn.1000-2634.1995.01.009

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It is not quite reliable to model fluid flow around horizontal wellbores with conventional reservoir simulators of rectangular grid system due to the fact that the fluid flow is found to be a radial flow. In this paper, we simulate the radial fluid flow around the horizontal wellbores with an efficient method of hybrid refinement around the wellbore by combining rectangular gridblocks with the radial gridblocks. We also choose the 7th SPE comparative Solution Project(SPE 21211) to demonstrate the effectiveness of the model.

Design Programme and Its Application of Optimum Tubing String for Water Drainage-Oil Recovery

Yang Hua Yang Chuandong

1995, 17(1): 70-81. DOI: 10.3863/j.issn.1000-2634.1995.01.010

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This paper comprehensively analyzes the mathematical model of optimum tubing string for continuous water drainage, the application design programme and the method of Nomograph, and the remarkable incremental effect and economic benefit obtained by the efficient recovery of water yield gas well and the study of gas-water two-phase flow in vertical tube.

Study on Radial Invasion Characteristics of Mud Filtrate

Liu Xiangjun Cheng Fuxuan

1995, 17(1): 83-88. DOI: 10.3863/j.issn.1000-2634.1995.01.011

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Using the two-phase flow model in multi-pore media, the convective transport model betWeen the fluids of different mineralization intensity and Archie equation, this paper calculates the radial distribution characteristics of resistivity and saturation on the mud filtrate invaded proiile. It is of great importance to the study of resistivity well-logging response.

Pipeline Network Reform of Gas Field Production in the Later Stage

Wang Shouxi Yu Pingren Li Changjun

1995, 17(1): 89-95. DOI: 10.3863/j.issn.1000-2634.1995.01.012

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It is more than 30 years since South Sichuan gas field began to be exploited. Now it has gone into low pressure production preiod. The stratum energy exhausion has made the surface gathering system unsuitable for the production, and has affected the further exploitation of the gap field. In consideration of the present situation of the gas field, this paper comprehensively analyzes the gathering, transportation and destribution functions of the surface gathering system, and puts forward the scheme that aims to decrease the main line pressure of the natural gas surface gathering system,thus coordinating the relationships of gathering,transportation and distribution.

Study of Single Spherical Roller Bit

Deng Rong Yang Shiliang Yu Kaian

1995, 17(1): 96-100. DOI: 10.3863/j.issn.1000-2634.1995.01.013

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This paper briefly describes the operating principle and characteristics of the single spherical roller bit(SSRB). The geometric and kinematic basic equations of SSRB are established by means of space analytical geometry method F the testing analysis of the bearing load is made by the experimental method; the computer simulation program is designed according to the kinematic basic equation of SSRB. The designs of geometric structure and performance of SSRB can be made by the methods mentioned in this papeer,and the comparision of a number of design plans can be made in a short period of time.

The Stress Analysis of a Thick-Walled Square Tube

Song Yu Tao Chunda

1995, 17(1): 101-108(. DOI: 10.3863/j.issn.1000-2634.1995.01.014

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By means of finite-element method, the authors analyze the problem in calculating the stress of a thick-walled square tube with circular inside, and find the rule of its stress distribution. The formula is given that can be used to calculate the stress concentration factors of the danger points on the tube s inside and outside surfaces.

Electric Circuit Simulation Analysis of Mechanical Vibration Isolation

Jiao Pelling

1995, 17(1): 110-114. DOI: 10.3863/j.issn.1000-2634.1995.01.015

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This paper presents the advantages of electric circuit simulation analysis of mechanical vibration isolation. This method can be further used to solve more complex problems in mechanical vibration as well as in dynamics.

Power Analysis of Downhole Static Pressure Unit

Wang Deyu He Dongsheng

1995, 17(1): 115-120. DOI: 10.3863/j.issn.1000-2634.1995.01.016

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In this paper, we analyze the ways and requirements of power transmission of the downhole static pressure unit, and point out that the surface drilling pump should provide power for the downhole pressure unit by delivering drilling fluid at high pressure and with lower volume in deep well drilling.

Cationic Polyacrylamide and Its Property

Ma Xiping Luo Lan

1995, 17(1): 121-125. DOI: 10.3863/j.issn.1000-2634.1995.01.017

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Modified cationic polyacrylamide has been synthesized by the reaction of acrylamide polymerisate with formaldehyde and dimethylamine. The experimental results indicate that the modified product is superior to polyacrylamide in clay swelling,flocculation, salt-resis tance and corrosion retardation.

A Study of Fracture and Wear Resistance of Laser Cladding Layer on Graphite Iron Substrate

Tang Furong Feng Zhigang Ma Deyan Peng Shengshang

1995, 17(1): 126-131. DOI: 10.3863/j.issn.1000-2634.1995.01.018

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Through a study of the fractures of laser cladding layer and the mechanism of its formation, the authors of this paper have discussed the fracture tendency of the laser cladding layer and its influence on wear resistance, and present some practical principles in the choice of cladding materialls and the performance of laser cladding.

Study of Exploitation Priority of Multiple Gas Reservoirs

Zhang Jijun Li Guangyao

1995, 17(1): 132-138. DOI: 10.3863/j.issn.1000-2634.1995.01.019

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On the basis of(6), this paper establishes, for a number of gas reservoirs to be exploited, the exploitation priority evaluation index system and its structural model, and sucessfully arranges the order of prior exploitation of multiple gas reservoirs to be exploited, combining the improved AHP method and approaching method, and taking into account the effect and the investment.

Simplification and Calculation of the Stator Winding Deploy Diagram of a Double-Electrode-Ratio, Two-Speed Motor

Zhang Kaixiang

1995, 17(1): 139-142. DOI: 10.3863/j.issn.1000-2634.1995.01.020

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Basing on the simplified principle of the stator winding deploy diagram of alternating current motor, this paper derives the winding deploy diagram of the double-electrode -ratio(4/2 electrode) electric motor, and gives the relative calculation.

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