Research and Application of Fast Plugging Method for Fault Zone Formation in Tarim Basin, China

Zhong He, Sheng Fan (), Junwei Fang, Yang Yu, Jun Zhang, Shuanggui Li and Peng Xu
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Zhong He: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Sheng Fan: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Junwei Fang: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Yang Yu: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Jun Zhang: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Shuanggui Li: Engineering Technology Research Institute of Sinopec Northwest Oil Field Branch, Urumqi 830000, China
Peng Xu: School of Petroleum Engineering, Yangtze University, Wuhan 430100, China

Energies, 2023, vol. 16, issue 11, 1-15

Abstract: The Silurian strata in the Shunbei No. 5 fault zone have the characteristics of long open holes, easy leakage and complex leakage. In the early stages, plugging technologies and methods such as bridging plugging, cement, chemical consolidation and high-water-loss plugging have poor effects and low plugging efficiency. Plugging slurry directly prepared with drilling fluid has low filtration characteristics, and the main reason is that the plugging material cannot filter quickly after the fluid enters the fracture. Based on the basic principle of fast filtration, the main plugging fluid M-Fluid, the micro-elastic high-strength main plugging agent M-Block and the filling agent Filling-Seal have been developed. In combination with the water-loss and wall-building properties of the circulating drilling fluid after plugging, a fast plugging technology for fractured volcanic rock formation has been established. The laboratory evaluation experiment showed that the filtration rate increased rapidly with the increase of temperature, and the filtration rate was about 0.31~0.79 mL/s, while the filtration rate of the drilling fluid was 0.0067 mL/s under the same conditions. The pressure-bearing capacity of various plugging evaluation methods, such as the simulated fracture of a large-grain sand bed, artificial fracture of small core and full-size core and multi-form fracture of double core, all exceed 5 MPa, and the system has a good plugging effect for complex fractures.

Keywords: lost circulation; fault zone; Silurian; quick plugging; pressure-bearing capacity; plugging technology (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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