沈北地区新型防塌钻井液技术  

The Novel Anti-caving Drilling Fluid in the Shenbei Area

作　　者：刘榆[1] 卿鹏程[1] 

机构地区：[1]辽河石油勘探局钻井公司,辽宁盘锦124010

出　　处：《石油钻探技术》2005年第3期29-31,共3页Petroleum Drilling Techniques

摘　　要：针对沈北地区在钻井施工中易形成键槽、缩径,地层垮塌掉块严重,导致卡钻及大段划眼的问题,研制出了高钙复合盐、KCl、聚合醚甲酸盐钻井液体系。试验表明,KCl钻井液抑制能力强,性能稳定,可以减少油层污染,防塌效果明显,而且可以达到废弃钻井液的零排放,有利于环保。聚合醚甲酸盐钻井液摩阻压耗小,热稳定性好,水力特性优良,有利于减少油层污染,提高钻井速度,大幅度降低井下复杂情况。高钙复合盐钻井液通过控制钻屑分散,抑制造浆,达到防塌和保护油气层的目的。现场应用表明,高钙复合盐、KCl、聚合醚甲酸盐钻井液体系抑制能力强,性能稳定,具有明显的防塌效果。沈北区应用高钙复合盐、KCl、聚合醚甲酸盐钻井液体系钻探9口井,均无井下事故发生,起下钻顺利,完井电测一次成功率达到100%,中完电测成功率达到87.3%,钻井周期平均缩短28.36d,获得了良好的经济效益。Downhole troubles that keys, tight hole and caving are most probably happen while drilling in the Shenbei Area, which result in pipe stuck and reaming. Regarding such scenario, drilling fluid systems such as high lime, KCl, PMA, etc. are developed. Tests show that KC1 drilling fluid performs high inhibitive and stability, thus can reduce reservoir pollutions, protect hydrocarbon zones remarkably, notably prevent hole sloughing, make zero discharge of waste drilling fluid which is good to environmental protection, in addition, PMA drilling fluid behaves low pressure loss, good thermo stability, high rheology, etc. These advantages are help to reduce pay zones pollution, improve drilling rate, reduce downhole troubles to great extents. The high lime drilling fluid is able to prevent caving in and protect hydrocarbon zones via controlling cuttings dispersion and inhibiting drilling fluid yielding. Field applications indicate all of above drilling fluid are high inhibitive, stable, anti-caving. Drilling in the Shenbei Area by employing above drilling fluid systems got remarkable economic benefits because of no downhole troubles, freely round trips, 100% of logging successful probability, 87. 3% of intermediate completion logging succeed, shortening drilling cycle 28. 36d, etc.

关 键 词：防塌钻井液 KCL 甲酸盐 辽河油田 

分 类 号：TE254[石油与天然气工程—油气井工程]