Formulation of High Temperature Gas-Kick Preventer and Its Mechanism of Blocking Gas Cut

ZHANG Zhen; YIN Da; SU Xiaoming; FENG Wei

doi:10.12358/j.issn.1001-5620.2025.06.006

Volume 42 Issue 6

Dec. 2025

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ZHANG Zhen, YIN Da, SU Xiaoming, et al.Formulation of high temperature gas-kick preventer and its mechanism of blocking gas cut[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：748-755 doi: 10.12358/j.issn.1001-5620.2025.06.006

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ZHANG Zhen, YIN Da, SU Xiaoming, et al.Formulation of high temperature gas-kick preventer and its mechanism of blocking gas cut[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：748-755 doi: 10.12358/j.issn.1001-5620.2025.06.006

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Formulation of High Temperature Gas-Kick Preventer and Its Mechanism of Blocking Gas Cut

doi: 10.12358/j.issn.1001-5620.2025.06.006

PetroChina Tarim Oilfield Branch, Korla, Xinjiang 841000

Received Date: 2025-07-19
Rev Recd Date: 2025-09-23

Available Online: 2025-12-08

Publish Date: 2025-12-08

Abstract

Abstract

In high temperature reservoir operations, oil/gas cut causes drilling accidents such as well kick and even well blowout. Conventional polymer gels, though can be used to prevent gas channeling from occurring, have poor high temperature resistance. In this study, a high temperature gas-kick preventer was prepared using a high temperature polymer AP-9, a crosslinking agent (polyethyleneimine and aluminum citrate in a ratio of 1∶1) and thiourea. Laboratory experiments were conducted to find the effect of the concentration of each component on the thermostability of the high temperature gas-kick preventer. As a result of the experiments, an optimal composition was determined as: 0.5%AP-9+0.4% crosslinking agent+0.25% thiourea. Laboratory evaluation results show that at 160℃ a gel formulated with 25 000 mg/L Na⁺ saltwater and the high temperature gas-kick preventer has viscosity of 7120 mPa·s after gelling, indicating that the high temperature gas-kick preventer has good salt resistance. After heating for 72 h, the viscosity of the saltwater gel still reaches 3328 mPa·s, and the pressure bearing strength of the saltwater gel is 0.23 MPa/m. The results of this study provide a technical support for effectively preventing gas kick in a high temperature well, they are helpful for achieving whole-process underbalanced drilling, and are of great importance to improving the safety and efficiency of drilling operation.
- High temperature reservoir,
- Polymer gel,
- High temperature gas-kick preventer,
- Gas-kick prevention performance

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References

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Formulation of High Temperature Gas-Kick Preventer and Its Mechanism of Blocking Gas Cut

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