Chengdu, China
Chengdu, China

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Chen D.,No. 8 Xindu Dadao | Wang X.,No. 8 Xindu Dadao | Jiao L.,No. 8 Xindu Dadao | Zhang J.,No. 8 Xindu Dadao
Drilling Fluid and Completion Fluid | Year: 2015

High bottom hole temperature and formation pressure of deep and ultra-deep wells easily give rise to poor cementation of cement sheath caused by fluid channeling. A high density flushing fluid, XM-1 was developed to tackle this problem. In laboratory study, a vegetable gum X-P was used as the suspending agent of the flushing fluid, CTK-1 as the weighting agent, and KZ-1 as the interface strength enhancing additive. XM-1 had good compatibility with oil base drilling fluid, and cleared mud cakes thoroughly. Cementation strengths between cement sheaths were increased by more than 50%. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.


Yan S.,No. 8 Xindu Dadao | Li X.,No. 8 Xindu Dadao | Hu R.,No. 8 Xindu Dadao | Yang S.,No. 8 Xindu Dadao | Zhang H.,No. 8 Xindu Dadao
Drilling Fluid and Completion Fluid | Year: 2015

Two modified carbon nanotubes, TNIMH4 (-OH) and TNIMC6 (-COOH) were selected to satisfy the needs of natural gas storage and high pressure oil and gas well for better mechanical performance of set cement. Laboratory experiments showed that cement slurry treated with 0.01% TNIMH4 had its compressive strength increased by 4.32%, cement slurry with 0.07% TNIMC6 had its compressive strength increased by 19.18%. At the same treatment, the compressive strength of cement slurry treated with TNIMC6 was greater than that of cement slurry treated with TNIMH4. Tri-axial compressive strength experiments showed that the tri-axial compressive strength of the cement slurry treated with TNIMC6 was 41.21% greater than that of the blank cement slurry., and the elastic modulus of the cement slurry was increased from 3692.5 MPa to 4366.5 MPa. SEM observation showed that the nanotubes at low concentrations were dispersed evenly in the set cement, and began to agglomerate at increasing concentrations, which in turn aggravated the heterogeneity of, and hence weakened the strength of the set cement. ©, 2014, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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