NUMERICAL SIMULATION OF HOLE CREEP SHRINKAGE FOR COMPOSITE ROCK SALT LAYERS

ZENG De-zhi; LIN Yuan-hua; LU Ya-feng; ZHU Da-jiang; LI Liu-wei

2012 Vol. 18, No. 2

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Article navigation > Journal of Geomechanics > 2012 > 18(2): 158-164

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ZENG De-zhi, LIN Yuan-hua, LU Ya-feng, ZHU Da-jiang, LI Liu-wei. NUMERICAL SIMULATION OF HOLE CREEP SHRINKAGE FOR COMPOSITE ROCK SALT LAYERS[J]. Journal of Geomechanics, 2012, 18(2): 158-164.

Citation:

ZENG De-zhi, LIN Yuan-hua, LU Ya-feng, ZHU Da-jiang, LI Liu-wei. NUMERICAL SIMULATION OF HOLE CREEP SHRINKAGE FOR COMPOSITE ROCK SALT LAYERS[J]. Journal of Geomechanics, 2012, 18(2): 158-164.

NUMERICAL SIMULATION OF HOLE CREEP SHRINKAGE FOR COMPOSITE ROCK SALT LAYERS

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
2.
Gas Production Engineering Research Institute, PetroChina Southwest Oil and Gas Fields Company, Guanghan 618300, China
3.
Beijing Winfield PetroleumTechnology Exploration Corporation, Beijing 100083, China

Received Date: 29 October 2011

Publish Date: 25 June 2012

Abstract

Abstract

Salt rocks have very strong creep behaviors in HTHP environment in deep formations, complex accidents such as hole shrinkage, drill pipe sticking, etc. occurring frequently. Current methods to calculate the safe drilling mud density are mainly used in circumstances of homogeneous earth stress. The 3-D finite element analysis (FEA) model of borehole creep shrinkage concerning salt rock and sand shale was established in this paper under triaxial earth stress. On the basis of deep wells of Yangtake in Tarim, laws of borehole creep shrinkage vs time were studied under the condition of heterogeneous earth stress, and values of borehole diameter in different times are obtained when the mud density is specified. Results calculated are very close to the safety drilling mud density field used in rock salt layers, thus verifying the reasonableness and reliability of the model established in the paper. Research results can provide technical support for safe drilling in rock salt layers.
- deep well /
- rock salt layer /
- creep /
- hole shrinkage /
- finite element simulation

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References

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