Organization
Research Institute of Drilling Engineering and Technology, Zhongyuan Petroleum Engineering Co., Ltd., SINOPEC, Puyang 457001, China
No.2 Drilling Company, Zhongyuan Petroleum Engineering Co., Ltd., SINOPEC, Puyang 457001, China)
Abstract
o overcome the problems of large amount loss of oilbased drilling fluid circulation and borehole instability caused by the fracture development in shale formations, a plugging material BAG1 was developed. BAG1 has some good performances, such as heat resistance of over 150 °C, 20 to 110 microns of particle size, and great compatibility with oilbase drilling fluid. Combining with conventional rigid and flexible materials, the oilbased drilling fluid plugging technology was developed. This technology can reduce the permeability of mud cake by 36.7%, seal the pressure up to 15 MPa and improve the compressive strength of soaked core by 21.1%. The field application in four wells in Jiaoshiba area shows that the technology has strong ability to block and prevent collapse. The average diameter expansion rate is less than 4%, the circulation loss of drilling fluid is less than 0.2 m3/h, and the construction of the horizontal section of the third opening is smooth. The plugging technology achieves the purpose of borehole stability and safe drilling.
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