强抑制性、防塌氯化钾聚合醇钻井液在尼日尔Goumeri油田定向井的应用

文章摘要

强抑制性、防塌氯化钾聚合醇钻井液在尼日尔Goumeri油田定向井的应用

Application of high inhibition, anti-sloughing KCl-Polyglycol drilling fluids in directional wells in Goumeri Block, Niger

投稿时间：2018-01-03 修订日期：2018-01-03

DOI：

中文关键词: 定向井氯化钾聚合醇钻井液抑制性防塌

英文关键词: Directional well KCl-Polyglycol drilling fluid Inhibition ability Anti-sloughing

基金项目:国家863计划“海上大位移钻井液关键技术研究”（2012AA091502）；中石油集团重大专项“高温高密度钻井液及可排放海水基钻井液成套技术研究”（2013E-3802）

作者	单位	邮编
焦小光^*	中国石油集团长城钻探工程有限公司钻井液公司	100101

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中文摘要:

介绍了氯化钾聚合醇钻井液在尼日尔Goumeri油田两口定向井的应用。该油田首次施工的此两口定向井最大井斜角接近30°,水平位移超过750m。钻遇的Sokor泥岩易水化膨胀造成缩径；低速泥岩则易剥落,引起掉块或井壁坍塌。现场在氯化钾聚合物钻井液的基础上,进入Sokor泥岩后引入3%聚合醇防塌剂,利用K₊与聚合醇的协同复配作用,形成强抑制性、防塌氯化钾聚合醇钻井液体系。同时在斜井段混入2%液体润滑剂RH8501和5%柴油(V/V),改善钻井液润滑性,降低发生粘卡的风险。钻井结果表明,使用強抑制性、防塌氯化钾聚合醇钻井液,可顺利解决钻遇Sokor泥岩和低速泥岩时地层坍塌、掉块和缩径问题。钻井液润滑性能良好,井壁光滑。在选定井段,井径规则,平均井径扩大率分别只有7%和10.9%。

英文摘要:

The application of KCl-Polyglycol drilling fluids in two directional wells in Goumeri Block, Niger was discussed. The two directional wells were first drilled in this block, with maximum inclination angle close to 30° and horizontal displacement more than 750m. The Sokor shale and Low Velocity shale were drilled and it is shown that the Sokor shale was inclined to swell when hydrated, leading to tight hole; while the Low Velocity shale was tend to slough to cause wellbore instability. On the basis of KCl-Polymer drilling fluid, 3% Polyglycol was added to create a high inhibition, anti-sloughing KCl-Polyglycol drilling fluid system by using the cooperative anti-sloughing capability of K+ and Polyglycol. When drilling the inclination section, 2% liquid lubricant RH8501 and 5% Diesel (V/V) were mixed into the drilling fluid to improve the lubrication ability and reduce the risk of pipe-sticking. The real drilling experience indicated that the above drilling problems met when drilling Sokor shale and low velocity shale were successfully solved by using KCl-Polyglycol drilling fluids. The borehole wall was quite smooth and the hole diameter was constant at specified section, respectively with hole diameter enlargement ratio at 7% and 10.9%.

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