摘要
在勘探开发过程中,乍得H区块下部地层存在严重的井壁失稳问题。利用X射线衍射、阳离子交换容量等试验手段,对Baobab N-8井岩样进行了系统分析,探讨了该地区复杂地层的井壁失稳机理。通过大量的单剂优选和配方优化试验,优化出适合乍得H区块下部地层特性并符合环保要求的防塌钻井液体系。研究结果表明,该体系可抗120℃高温,抗岩屑污染达到10%,抗钙污染达到1%,抗NaCl污染达到10%,可满足乍得H区块易坍塌地层钻井的需要。
In the process of exploration and development, some wellbore instability problems have been encountered in the h）wer formation in Block H of Chad. The physical-chemical properties of rock samples from Well Baobab N-8 in Block H were analyzed using the experimental methods of X-ray diffraction and cation exchange capacity. The wellbore instability mechanism of complex reservoir in this area was discussed. A new anti-sloughing drilling fluid suitable to Block H in Chad was developed by selecting all kinds of additives and optimizing formulation. The results show that the system can resist the high temperature of 120 q[2, the calcium tolerance is I%, the salt tolerance is 10% and the drilling cuttings tolerance is 10~6, which can meet the requirement of drilling in in this area.
出处
《断块油气田》
CAS
2012年第6期809-812,共4页
Fault-Block Oil & Gas Field
基金
中油国际(乍得)有限责任公司重大科研项目"乍得H区块Bio-Pro钻井液体系优化技术研究及现场应用试验"
关键词
井壁稳定性
失稳机理
防塌钻井液
配方
乍得H区块
wellbore stability
instability mechanism
anti-sloughing drilling fluid
formulation
Block H in Chad
