Journal of Southwest Petroleum University(Science & Technology Edition)

PROPERTIES OF GFT AND ITS FAST ALGORITHM

Yi Zongfu Lei Xiao

1993, 15(1): 1-9. DOI: 10.3863/j.issn.1000-2634.1993.01.001

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According to the definition of General Fourier Transform(GTT),we discussed its properties gave its relationship to Discrete Fourier Transform(DFT), and proposed a fast algorithm calculating GFT by Fast Fourier Transform(FFT).

A NEW METHOD OF DETERMINIG LOWER LIMIT OF EFFECTIVE POROSITY IN CARBONATE OIL OR GAS RESERVOIR

Cai Zhengqi Zheng Yongjian Liu Yunhe Hua Yongchuan

1993, 15(1): 10-15. DOI: 10.3863/j.issn.1000-2634.1993.01.002

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In this paper,we developed a new method,a relative formula method,to determine the lower limit of effective porosity.The method is resonable for practical calculation.Moreover,we corrected some mistake points of view after seriovsly analyzing the question as to how we use the lower limit conditions and some other questions.

WATER-SOLUBLE GAS-A NEW RESOURCE OF NATURAL GAS IN SICHUAN BASIN

Yang Yuancong Li Shaoji Zhu Jiang

1993, 15(1): 16-22. DOI: 10.3863/j.issn.1000-2634.1993.01.003

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Water-soluble gas isa non-conventional natural gas,which has not been studied yet at home.This paper presented for the first time the classfication of water-soluble gas reservoirs,illustrates the factors which influence the gas dissolubility in formation water,and the geologic and development characteristics,and finally evaluated water-soluble gas resources and pointed out the areas favourable to exploration in sichuan basin.

A LOGGING EVALUATION MODEL AND ITS APPLICATION TO DAMAGED FORMATIONS

Chen Fuxuan Yan Jun Liu tangyan Xia Hongquan

1993, 15(1): 23-28. DOI: 10.3863/j.issn.1000-2634.1993.01.004

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There are a lot of short comings,such as long period,high cost and harsh condition of test in evaluatiing damaged formations by the method of unstable well testing,or normal method in room,or particular core analysis.On the basis of combing with the data form drilling,well testing,core analysis and engineering,we evaluated and analysised the damages degree of formations according to the logging evaluation method in this paper.In the course of the study,we took full use of logging information.After evaluation the damaged formation quantittatively,we discussed the law concerned.

RELATION BETWEEN BIVALVIA AND PALAEOCURRENT IN FEIXIANGUAN FORMATION OF LOWER TRIASSIC IN BEIBEI，CHONGQING

Deng Tao

1993, 15(1): 29-33. DOI: 10.3863/j.issn.1000-2634.1993.01.005

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There are many fossils of Bivalvia in the marl of Feixianguan formation of Lower Triassic in Beibei,Chongqing.The shells' arrangement is regular.In the samples under study,the bisectors of the shells which pass through their beaks are parallel to the palaeocurrent sirection,and the beak indicates the current direction.After measuring 53 shells at random,we calcalated the palaeocurrent direction,which is 294,with mathematical statistics mathod,and proved these shell members ' sedimentary envirment to be tidal ditch on tidal flat of lagoon.

CARBONATE RAMP SEDIMENTATION OF PERMIAN IN WUJIAPIN，SICHUAN ANDITS NEIGHBOURING REGION

Zhang Fan Wen Yinchu Qiang Zitong Wan Shinhai

1993, 15(1): 34-41. DOI: 10.3863/j.issn.1000-2634.1993.01.006

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The Limestone(Upper Permian) in wujiapin was deposited on a carbonate ramp in sichuan and its neghbouring region,and gradually transitted with the basin facies northwards and northeastwards.The shallow water high energy zone of the ramp was developed in southwestern off-shore area,characteristed by the mixed deposition of terrigenous clastic-carbonate.It was the paleogeography of the carbonate distribution of the reef-gas-pool in Upper Permian in this area.

APPROACH TO SUSPENSION PROPERTIES OF NON-HOMOGENEOUS CUTTINGS ON BEDS IN ECCENTRIC ANNULUS

Wang Yanhui Luo Pinya

1993, 15(1): 42-48(5. DOI: 10.3863/j.issn.1000-2634.1993.01.007

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Based in the analysis of suspension mechanism，this paper derived the suspesion condition from the depositional characteristics of single cuttings particle in non-homogeneous turbulence fiels.Which is described by the annular hydraulics and load-bed properties of cuttings,took into consideration the effects of particle shapes and cuttings concentration,and established the formula of the slip velocity of non-globe cuttings damped setting,thus evaluated the macroscopic laws of cuttings-suspension transportation under the given flow in eccentric annulus.

RECOGNITION RESEARCH OF COMPLICATED CASES AND ACCIDENTS IN DRILLING OPERATION BASED ON BAM NEURAL NETWORK

Mei Wenrong

1993, 15(1): 49-55. DOI: 10.3863/j.issn.1000-2634.1993.01.008

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On the basis of analyzing the complicated cases and accidents in drilling operation in detail,this paper prented a new method,neural nestwork,and applied it successfully to solve the recognition of the complicates cases and accidents in drilling operration.BAM neural network has such features as simple model and algorithm,so it can ba used as a better tool for the research similar to pattern recognition.Neural network is a branch of artificial intelligence,and has a wide application prospect.

AN IMPROVED MODEL FOR PREDICTING PERFORMANCE IN STEAM INJECTION WELLS

Li Yingchuan Du Zhimin

1993, 15(1): 56-64. DOI: 10.3863/j.issn.1000-2634.1993.01.009

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This paper presents an improved model for predicting performance in steam injection wells,which incorporates a downward two-phase flow correlationspresented by Mukherjee and Brill(1985) and account for flow direction and wall inclination angle.It can be used for predicting performance in horizontal steam injection wells that ara developing.The fundamental differential equation in the model is solved numerically by using a fourth-order Runge-Kutta method in which the choice of the start position is arbitrary,it is convenient to take into account the coordination between wellbore and injection layer.

AUTOMATIC METHOD OF DAT ANALSIS

LiZhiping Zhao Birong Li Xiaoyun

1993, 15(1): 65-68(7. DOI: 10.3863/j.issn.1000-2634.1993.01.010

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Combining optimization method with numerical simulation,this paper presented an automatic method of analysis of DST data by computer,and compiled a software.The permeabiluty-thickness product(KH) and skin factor(S) can be solced by computer automatically when users input the data of DST according to their needs.Using this software can get satisfactory results in analyzing many DST data in-situ.

DIFFERENTAL SIMULATION PREDICTION OF PERFORMANCE OF WATER-INJECTlON OILFIELD

Liu Zhibin

1993, 15(1): 69-74. DOI: 10.3863/j.issn.1000-2634.1993.01.011

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According to analyzing the multi-time series data of the oil field performance,we set up the differential simulation of oil field performance.Using this simulation to predict,we obtained a new way to predict one state variant's development trend from the overall oil field state variants.Also,we calculated the oil production of H-L water-injection oilfield in our conutry.The result obtained is satisfactory.

EELASTOPLASTIC ANALYSIS OF OVER-FIXATION OF TOOTH HOLE

Dong Shier Zhang Xianpu Hou Jikang

1993, 15(1): 75-82. DOI: 10.3863/j.issn.1000-2634.1993.01.012

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The over-fixation of the rock bit's tooth hole used to be determined by tests and statistics method in all China's rock bit manufacturers.This method is affected is affected by such factors as processing,testing and so on,and its period is long,and its cost high.For this problem,using the finite element method,we analyzed the over-fixation of the tooth hole of a rock bit,and the distribution laws of stress field aroud the tooth hole.

APPLICATION OF NEVV MATERLALS TO ROCK BIT BEARINGS

Xu Zhiyue Wang Ziyu

1993, 15(1): 83-89. DOI: 10.3863/j.issn.1000-2634.1993.01.013

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This paper pointed out the primary property requirements based on the clear analysis of the working condition of a rock bit bearing system.The results obtained show that the super hard materials are adaptable to rock bit bearing than metal materials.Better structure designs and machinable-mixed bearings are the strongest rival in the future rock bit market.

DETERMINATION OF CRITICAL LENGTH OF THERMAL BUCKLING DURING LONGITUDINAL AND TRANSVERSE BENDING OF BARS

Li Youxing

1993, 15(1): 90-96. DOI: 10.3863/j.issn.1000-2634.1993.01.014

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Through calculation and analysis,we obtained the general expression of the critical pressure during longitudinal and transverse bending of bars,derives,on the basis of Euler stress,the calculating formula of critical temperature and length during longitudinal and transverse bending of bars by the reliabilty theory.It provides a new analysis method for the calculation of thermal buckling problems of bars,and a base for stability analysis of heating t ransportation pipelines.

INFLUENCE OF CEMENT ADDITIVE ON CEMENT FILTRATE COMPOSITION

Yao Xiao Wang Dazhi

1993, 15(1): 97-101(. DOI: 10.3863/j.issn.1000-2634.1993.01.015

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This paper studied the chemical composition of the cement filtrate in the slurry with or without additive,tested the compatibility of mud-cement and formation brine-cement.Based on the analysis of cement filtrates with different additives,a new way to reduce the damaging ion concentration in cement filtrates is to use the additive which has no poisoning to the nucleation process of calcium hydroxide,which can loweer formation damage caused by cement filtrates.

APPLICATION OF GREY TARGET DECISION IN OIL FIELD DEVELOPMENT PROGRAM EVALUATION

Li Qisheng

1993, 15(1): 102-107. DOI: 10.3863/j.issn.1000-2634.1993.01.016

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This paper expanded grey target decision,which can be used in oilfield development program evaluation and choose the optimized program from among feasible programs.Its calculation is simple,and the results chosen are high in reliability.

IBM-PC GENERAL IN-CIRCUIT EMULATOR

Chen Wei

1993, 15(1): 108-111. DOI: 10.3863/j.issn.1000-2634.1993.01.017

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This paper provided a general in-circuit emulator based on dual-port storage structure.The emulator consists of IBM-PC microcomputer,storage board and processor emulation board.It is suitable for developing 8-bit bus microprocessor without on-chip ROM.The paper also gave a practical example of 8098 single component microcomputer emulation.

EXISTENCE OF SOLUTIONS FOR A NONLINEAR SINGULAR EQUATION

Xie Chengkang

1993, 15(1): 112-119. DOI: 10.3863/j.issn.1000-2634.1993.01.018

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This paper studied the regular Cquchy problem of the nonlinear singular equation,and verified the existence of solutions under conditions of weaker limitation of f.

GLOBAL SM00TH SOLUTION OF THERMALLY INSULATED GAS DYNAMICS EQUATIONS

Guo Dali

1993, 15(1): 120-128. DOI: 10.3863/j.issn.1000-2634.1993.01.019

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In this paper we dealt the Cauchy problem of the thermally insulated gas dynamics equations in Lagrange coordinate,and obtained three theorems on the existence of its global smooth solutions.

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