用于泥页岩隔离液悬浮稳定剂的优选
2017-07-10林子旸
林子旸
摘 要:测定了不同浓度的外加悬浮稳定剂的其流变性及悬浮稳定性,对比其各项性能的优劣,对常用的悬浮稳定剂进行复配,考虑其流变性、沉降稳定、API失水等综合评价确定最佳复配比。所得的最佳复配比的悬浮稳定剂可以较好的与泥页岩地层所用的常规钻井液和水泥浆体系相匹配、节省资金的同时保证施工安全环保。
关 键 词:泥页岩;悬浮稳定剂;流变性
中图分类号:TE357 文献标识码: A 文章编号: 1671-0460(2017)07-1322-04
Optimal Selection of Suspension Stabilizer for Slate Separation
LIN Zi-yang
(Northeast Petroleum University, Heilongjiang Daqing 163318, China)
Abstract: Rheological properties and suspension stability of the suspension stabilizers with different concentrations were measured. The advantages and disadvantages of these suspension stabilizers were compared. Considering their rheological properties, settling stability,API water loss, the best mixing ratio of compound stabilizer was determined by comprehensive evaluation. The suspension stabilizer with the best compound ratio can better match with conventional drilling fluid and cement slurry system used in the mudstone formation, which can ensure the construction safety.
Key words: Mud shale; Suspension stabilizer ; Rheological
随着新型页岩气的勘探开发,页岩地层井壁稳定性问题也日益突出,该种地层由于表面存在大量的微型裂缝,在钻井过程中该地层中的黏土化合物易发生水化膨胀,从而导致井壁坍塌。隔离液的选择很大程度上决定了后期固井质量的好坏与井壁的稳定情况,目前页岩地层钻完井大多数仍使用单一悬浮稳定剂配置的单配方隔离液[1-5],该类型隔离液在后期固井过程中表现出的缺陷已经越来越凸显,主要是由于单一隔离液只能满足单一性能的提升,综合性能有明显的不足,大多数没有较好的悬浮稳定性能,导致加重剂下沉,隔离液上部密度较低,钻井液无法悬浮[6-10],而悬浮液下部在加重剂作用下,密度增大,与水泥浆接近,隔离液不能得到有效悬浮,加大了水泥浆与钻井液的融合污染的可能性,使得水泥浆和钻井液性能都被一定程度的破坏,降低顶替效率,从而影响固井完成质量[3]。
针对以上问题,本文测定了常用的单一悬浮稳定剂相应各项性能,确定单一悬浮稳定剂各性能的优劣,并对所选悬浮稳定剂进行复配,得到满足泥页岩地层钻完井过程中各项性能要求的最佳复配比[11-15]。……
