A Mechanical Model of Borehole Stability for Weak Plane Formation Under Porous Flow

被引：43

作者：

Lu, Y. H. ^{[1
]}

Chen, M. ^{[1
]}

Jin, Y. ^{[1
]}

Zhang, G. Q. ^{[1
]}

机构：

[1] China Univ Petr, Coll Petr Engn, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China

来源：

PETROLEUM SCIENCE AND TECHNOLOGY | 2012年 / 30卷 / 15期

关键词：

borehole stability; mechanical model; piedmont; porous flow; weak plane formation;

D O I：

10.1080/10916466.2010.514583

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Based on influence of porous flow on weak plane model, the authors established a mechanical model of borehole stability for weak plane formation under porous flow and analyzed effect of weak plane on borehole stability under porous flow. The results indicated that porous flow decreased strength of weak plane, enlarged the affecting domains of weak plane for rock mass strength, and worsened borehole instability in weak plane formations. With porous flow increasing, water content of weak plane increases. For the weak plane with DIP < 10 degrees, the borehole is stable; for 10 degrees < DIP < 30 degrees, the borehole is likely unstable when azimuth is close to the direction of maximum stress, and the larger the dip, the worse the borehole stability; for DIP > 30 degrees, it is opposite to the situation of 10 degrees < DIP < 30 degrees. While weak plane formation is next to be saturated, the minimum drilling fluid density for borehole stability does not change with weak plane azimuth and borehole stability is the worst. The mechanical model of borehole stability for weak plane formation under porous flow is applied to a well in Tarim Basin piedmont.

引用

页码：1629 / 1638

页数：10

共 21 条

[11]

Hale A. H., 1992, IADC SPE DRILL C NEW

[12]

Jaeger JC., 2009, FUNDAMENTALS ROCK ME

[13]

Jeon S., 2004, Int J Rock Mech Min Sci, V41, P658, DOI [DOI 10.1016/J.IJRMMS.2004.03.115, 10.1016/j.ijrmms.2004.03.115]

[14]

Jin, 1999, DRILL PROD TECHNOL, V22, P13

[15]

Jin Y, 1999, J U PET CHINA, V23, P33

[16]

Mitchell R. F., 1987, SPE IADC DRILL C NEW

[17]

Ottesen S., 1991, SPE IADC DRILL C AMS

[18] MECHANISMS OF BOREHOLE INSTABILITY IN HEAVILY FRACTURED ROCK MEDIA [J].

SANTARELLI, FJ ;

DAHEN, D ;

BAROUDI, H ;

SLIMAN, KB .

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS, 1992, 29 (05) :457-467

[19] Transport in shales and the design of improved water-based shale drilling fluids [J].

vanOort, E ;

Hale, AH ;

Mody, FK ;

Roy, S .

SPE DRILLING & COMPLETION, 1996, 11 (03) :137-146

[20]

Zhang J., 2000, SPE PS CIM INT C HOR

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