HT2井三开水基钻井液CO32-和HCO3-污染处理工艺

祝学飞; 孙俊; 徐思旭; 刘皓枫; 査凌飞

doi:10.3969/j.issn.1001-5620.2019.01.007

HT2井三开水基钻井液CO₃^2-和HCO₃^-污染处理工艺

doi: 10.3969/j.issn.1001-5620.2019.01.007

川庆钻探工程有限公司新疆分公司, 新疆库尔勒 841000

详细信息

作者简介:
祝学飞,工程师,1983生,主要从事钻井液技术管理工作。电话13899081413;E-mail:253183111@qq.com

中图分类号: TE254.2
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出版历程
- 收稿日期: 2018-09-15
- 刊出日期: 2019-02-28

Treatment of CO₃^2- and HCO₃^- Contamination in Water Base Drilling Fluid Used in Drilling the 3rd Interval of the Well HT2

Xinjiang Branch of CCDC, Korla, Xinjiang 841000

摘要

摘要: HT2井三开φ311.1 mm井眼4 513~5 785 m井段在钻进、中途完钻过程中，因和田河气田主产层东河砂岩段与非产层奥陶系灰岩、云岩碳酸盐地层持续释放阴离子，水基钻井液被CO₃^2-和HCO₃^-污染周期长达140 d，该阶段滤液Ca²⁺浓度始终为零；因地层破碎前期出现三次卡钻事故，需钻井液保持高黏度、切力（漏斗黏度为120~150 s、切力为（4~5）/（15~25） Pa/Pa），将地层掉块及时有效带出，在二者相结合的条件下，钻井液出现脱气困难、泥浆泵上水困难问题，流变性难以控制，后期深井高温段遭遇无任何资料介绍的钻井液呈低温果冻状形态。前期通过引入生石灰、氯化钙、有机盐和纳米乳液，后期在未使用稀释剂的前提下通过高浓度磺化胶液、碱液进行维护调整，较好地控制了钻井液的流变性，保证了工程安全钻井，实现了预期地质目标。
- 阴离子 /
- 污染 /
- 高黏度 /
- 高切力 /
- 流变性 /
- 工程安全
Abstract: During drilling of the φ311.1 mm section between 4513 m and 5785 m of the well HT2, invasion of anions from the Donghe sandstones (main pay zone of the Hetianhe gas field) and the non-productive Ordovician limestone and dolomite caused CO₃^2- and HCO₃^- contamination to the drilling fluid used for 140 d. Calcium concentration in the drilling fluid were always zero throughout the section. The drilling fluid was required to have high viscosity (funnel viscosity = 120-150 sec) high gel strength (10 sec/10 min gel strengths =(4-5) Pa/(15-25) Pa) to clean the hole because of three times of pipe sticking in broken formation sections, and this high viscosity/high gel strength caused the drilling fluid to have difficulties degassing and pumping. The rheology of the drilling fluid were then becoming difficult to control, finally the drilling fluid turned to a jelly state at high temperatures which no technical articles can be used for reference. In the early stage, quicklime, calcium chloride, organic salts and nanophase emulsion were introduced into the drilling fluid for property maintenance, and in the later stage, the properties of the drilling fluid were maintained with high concentration sulfonated polymer solution and alkaline liquor, without the addition of thinners in the drilling fluid. The properties of the drilling fluid were thus maintained stable through the whole section, ensuring safe drilling and realizing the geological goals expected.
- Anion /
- Contamination /
- High viscosity /
- High gel strength /
- Rheology /
- Engineering safety

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