No 1088

Tanggu, China
Tanggu, China
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Gao Y.,No 1088 | Liu X.,No 1088 | Tan W.,No 1088 | Liu A.,No 1088 | Yang J.,No 1088
Drilling Fluid and Completion Fluid | Year: 2014

Two kinds of polyalcohol having different cloud points are developed for use in wells with different temperatures to stabilize unstable shale or claystone formations. The 3% BDSC-300L-A and 3% BDSC-300L-B polyalcohol solutions, having cloud points of 55℃ and 70℃, respectively, suppressed the ratio of swelling of shale cores by more than 50% at 93℃, without causing any foams in their solutions. Study on key additives for the drilling fluid formulated with the polyether polyalcohols gave birth to three new technologies; first, controlling the cloud point of the polyalcohols downhole. By adding inorganic salts and anionic surfactants into the mud, the cloud point of a polyalcohol can be adjusted, and a reversible change of oil-in-water mud to water-in-oil mud at the same borehole temperature can be achieved. Second, the synergetic effect between the polyether polyalcohol and potassium salts greatly retarded or even completely inhibited the hydration and swelling of claystone and shale. Third, by adding an organic silicone (10 mg/L) into the polyether polyalcohol mud, foaming was effectively and efficiently eliminated. Polyalcohol additives and the application thereof play an important role in enhancing the inhibitive capacity of water base drilling fluids. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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