1999 Vol. 5, No. 1

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WELLBORE STABILITY ANALYSIS OF EXTENDED REACH WELLS
JIN Yan, CHEN Mian, LIU Gonghui, CHEN Zhixi
1999, 5(1): 6-13.
Abstract (380) PDF (157KB)(24)
Abstract:
Stability of extended reach wells is an important subject. Instability problems like lost circulation and borehole collapse during drilling operation lead to poor hole conditions causing a lot of problems like poor cement displacement and others. As a result, excessive nonproductive time and expensi...
LIQUID-SOLID COUPLED PROBLEM OF RADIAL FLOW THROUGH POROUS MEDIA UNDER GENERAL PLAIN STRESSCODITION
XU Zenghe, XU Xiaohe
1999, 5(1): 14-18.
Abstract (188) PDF (139KB)(23)
Abstract:
Taking into account the behavior that the permeability of deformable porous media varies with their porosity, the liquid-solid problem of liquid flowing through porous media under general plain stress condition is discussed.First the goveming equations are published, then a decoupled method is propo...
THE PROBLEMS OF FLUID-SOLID COUPLING AND ITS ADVANCE IN RESEARCH
DONG Pingchuan, XU Xiaohe, HE Shunli
1999, 5(1): 19-28.
Abstract (329) PDF (158KB)(15)
Abstract:
In traditional seepage theory it is assumed in general that the medium or the solid skeleton through which the fluids flow is perfectly rigid, that is, the solid frame containing the fluids does not deform either elastically or plastically due to the pressure of the incumbent fluid. The coupling bet...
FUNDAMENTAL EQUATION AND FINITE ELEMENT MODELING FOR OIL AND GAS MIGRATION DRIVED BY CRUSTAL STRESS
WANG Lianjie, WANG Wei, ZHANG Lirong, YUAN Jiayin
1999, 5(1): 29-34.
Abstract (306) PDF (115KB)(14)
Abstract:
In this paper are described first the differential equation and finite element formula for fluid migration under the action of crust stress in a porous rock. Then the oil migration potential field in Liaohe oil field are calculated by using finite element method based on crustal stress measurement. ...
CALCULATION OF ELASTOPLASTIC DEFORMATION OF WELLBORE IN SOFT MUDSTONE USING LAGRANGIAN METHOD
DENG Jingen, LIU Shujie, SHI Deqin, ZHANG Li
1999, 5(1): 35-39.
Abstract (218) PDF (106KB)(7)
Abstract:
In this paper we presented a review on the current situation of mechanical stability of wellbore in mud-shale bed and for the first time introduced large deformation theory into the calculation of elastoplastic deformation of wellbore and adjacent rock.Using Lagrangian method, we analyzed the proble...
NUMERICAL SIMULATION OF STRESS AROUND BORE HOLE
Liu Jie, Song Huizhen, Wang Yujie, Zhang Yiyuan
1999, 5(1): 40-46.
Abstract (253) PDF (139KB)(19)
Abstract:
In this paper, the distribution of in-situ stress and the changed stress field after boring are studied. By use of three-dimensioal FEM and a adaptive boundary load, an outlying oil field of Daqing is modeled as an example. The results, including stress direction, the relationslip between stress and...
A STUDY ON 3-D FINITE ELEMENT INVERSE MODEL
ZENG Hairong, SONG Huizhen
1999, 5(1): 47-51.
Abstract (234) PDF (178KB)(9)
Abstract:
Based on 3-D joint-element, the theory and methodology are discussed about inversion of geodetic data. The important FEM and inversion formula are given in detail; also a related code is developed. By use of this program, a FEM model is tested, which verifies the validity of the method here presente...
NUMERICAL SIMULATION OF STRESS FIELD IN RESERVOIR
YIN Youquan, CHEN Hu, JIANG Tian, SHAN Wenw en
1999, 5(1): 52-61.
Abstract (227) PDF (378KB)(16)
Abstract:
This paper gives two methods to simulate a stress field in the reservoir. The first method is that some measured stress data and the model of a three-dimensional membrane element are used to detemine the far field stress boundary condition with a back analysis and thereby to evaluate the stress fiel...
NEW NUMERICAL SIMULATION METHOD OF ROCK FAILURE PROCESS UNDER ROCKBURST AND EXCAVATING
QIAO He, TANG Chun'an, LI Xiao, CHEN Rongde
1999, 5(1): 62-66.
Abstract (214) PDF (177KB)(9)
Abstract:
The nonlinear deformation of rock is caused by heterogeneity and anisotropy.A newly developed numerical code, RFPA (2D) (Rock Failure Process Analysis), is applied to study of failure process of rock under excavating, and macroscopic non-linear behavior of rock may be caused by continually fracturin...
Laboratory Study on Effect of Hydration to Shale Mechanics
LU Baoping, LIN Yongxue, ZHANG Chuanjin
1999, 5(1): 67-72.
Abstract (262) PDF (128KB)(11)
Abstract:
On the basis of analyses of wellbore unstability mechanism, the changing law of shale mechanics parameters was established after shale hydration by the experimentation. The results from contrasts of collapsing pressures between unhydrated shale and hydrated one indicate that collapsing pressure for ...
LABORATORY TEST METHOD STUDY OF DEEP ROCK PHYSICAL MECHANICS
ZENG Lixin
1999, 5(1): 73-77.
Abstract (227) PDF (91KB)(14)
Abstract:
Using the triaxial rock mechanics testing unit manufactured by American MTS Co, rock strength and deformation behavior are studied. The test results of core specimens show that rocks with the same lithologic properties indicate different deforming behavior while rocks with different lithologic prope...
A ATTEMPT OF QUANTITIVE PREDICTION OF NATURAL CRACK ON BRITTLE ROCK RESERVOIR
SONG Huizhen
1999, 5(1): 78-86.
Abstract (168) PDF (193KB)(12)
Abstract:
This paper consists of four parts:(1)According to the Griffith theory of brittle strength the formulae of a criterion of failure were derived by author under the stress field (convention is that the tensile stress is positive) and applied them to analysis of the natural crack for reservoir; (2)Three...
INSITU STRESS MEASUREMENT BY A METHOD USING ORIENTED CORE
LI Hong, CHEN Jingsong, JIANG Nansheng, WANG Fujiang, ZHANG Bochong
1999, 5(1): 87-91.
Abstract (242) PDF (117KB)(36)
Abstract:
A borehole was drilled in granodiorite rockmass at Fangshan, Beijing, China. The depth of the borehole is 301m with diameter of 110mm. From about 30m to 301m, all cores were oriented by cement end cap method. AE Kaiser effect tests on oriented core at depth of 294m were carried out. The rock specime...
PALAEOMAGNETIC ORIENTATION OF CORES AND ITS APPLICATIONS FOR INSITU STRESS MEASUREMENTS
HOU Shouxin, TIAN Guorong
1999, 5(1): 92-98.
Abstract (209) PDF (243KB)(19)
Abstract:
A core from a certain depth is marked with a master orientation line (MOL), and is made into standard samples, which are used in palaeomagnetic tests and differential strain analysis (DSA) in the laboratory. The original orientation of the core in the formation can be obtained by magnetic cleaning t...

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