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Tanggu, China

Teng Z.,No. 40 of Jintang Lu | Tang S.,No. 40 of Jintang Lu | An S.,No. 40 of Jintang Lu | Li Z.,No. 40 of Jintang Lu | And 3 more authors.
Drilling Fluid and Completion Fluid | Year: 2014

In-situ reservoir pressure system is always deteriorated during early water injection operation, which is aimed at maintaining formation pressure for better producing low permeability reservoirs. This operation commonly resulted in abnormal local formation pressures which in turn lead to water channeling in wells nearby, necessitating high toughness of cement sheath for fracturing operation. A new toughening anti-channeling agent was developed and evaluated for its performance in laboratory. Cement slurries treated with this anti-channeling agent showed good anti-channeling performance, increasing the linear rate of expansion of set cement by 0.04%-0.14%, decreasing the elastic modulus of set cement by 10%-30%, and increasing the impact strength of set cement by 10%-16%. Field application of this toughening anti-channeling agent in 40 wells found 100% success in well cementing. After fracturing operation, oil recovery in the produced fluid was remarkably enhanced. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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