第34卷第3期 2017年5月
钻井液与完井液
DRILLINGFLUID & COMPLETIONFLUID
doi:10.3969/j.issn.1001-5620.2017.03.018
Vol.34 No.3 May2017
储气库固井用油井水泥增韧材料的优选与应用
王秀玲，任文亮，周战云，刘卫军，孙丽，侯平
（中石化中原石油工程有限公司固井公司，河南濮阳457001）
王秀玲，任文亮，周战云，等.储气库固井用油井水泥增材料的优选与应用[1].钻井液与完井液，2017，34（3)：89-93，98. WANG Xiuling, REN Wenliang, ZHOU Zhanyun, et al.Selection and application of toughening agent used in cementing gas
storage well[J].Drilling Fluid & Completion Fluid, 2017, 34 (3) : 89-93, 98.
摘要针对储气库生产对水泥石韧性的特殊要求，
优选了粒径为0.15～0.18mm经表面改性的橡胶粉作为弹性材料，
聚丙烯纤维作为增韧材料，通过实验确定弹性材料和增韧材料的最佳加量分别为3.0%和0.1%，并配合使用PVA胶乳类降失水剂，改善水泥石脆性，提高耐冲击能力及抗折能力，满足水泥环频繁高压注采条件下的长期密封性。综合评价了增韧水泥石的弹性模量、抗折强度、抗压及胶结强度、渗透率及应力条件下水泥环窑封性，与净浆水泥石相比，弹性模量降低了43%，抗折强度增加了84.6%，渗透率小于0.05mD，能够满足35MPa压力、35℃温差下的水泥环密封性要求，适用于储气库围并。
关键词储气库；围井；增韧低渗水泥荣；增郁材料；长期密封性
中图分类号：TE256
文献标识码：A
文章编号：1001-5620（2017）03-0089-05
Selection and Application of Toughening Agent Used in Cementing Gas Storage Well
WANGXiuling,RENWenliang,ZHOUZhanyun,LIUWeijun,SUN Li,HOUPing
(CementingBranch of Zhongyuan Petroleum EngineeringLid., Sinopec, Puyang, Henan 457001)
Abstract A toughness-enhanced cement slurry was formulated to cement gas storage wells which have special requirements for the toughness of set cement. A surface modified rubber powder (particle size between 0.15 mm and 0.18 mm) and a polypropylene fiber were used in the cement slurry as an elastic enhancer and a toughening agent, respectively. The optimum concentrations of the elastic enhancer and the toughening agent were determined to be 3.0% and 0.1%, respectively, through laboratory experiments. PVA latex was used as a filter loss reducer to minimize the brittleness of the set cement, improving its impact resistance and anti-breaking performance, and satisfying the needs of cement sheath for long-term airtightness under frequent high-pressure injection and production. Laboratory experiments were done to evaluate the toughness-enhanced set cement for its elastic modulus, anti-breaking strength, compressive strength, bonding strength, permeability, and the airtightness of the cement sheath under stress. Compared with the set cement formed with base cement slurry, the elastic modulus of the toughness-enhanced cement slurry was reduced by 43% the anti-breaking strength was increased by 118%, and the permeability of the set cement was less than 0.05 mD. These data indicated that the toughness-enhanced cement slurry was able to satisfy the needs for airtightness of the cement sheath under 35 MPa and 35 °C temperature difference, suitable for cementing gas storage wells.
Key words Gas storage; Set cement; Toughness-enhanced cement slurry; Toughening agent; Long-term airtightness
目前国内外在用的增韧材料主要有弹性颗粒，包括橡胶粉、沥青1-5；纤维类材料，包括玻璃纤维、聚丙烯纤维和碳纤维等3.6；大分子聚合物材料，包括胶乳、树脂类(7-3)。中油渤星公司开发了一种
增韧防窜剂，主要成分为环氧树脂，中石化工程院主要采用纤维+胶乳[9，国外采用橡胶较多。据研究，降低弹性模量最好的是橡胶，其次是树脂材料胶乳、纤维对弹性模量的影响较小；对抗压强度影
基金项目：中国石油化工集团公司研究项目“枯竭砂岩气田改建储气库钻完井关健技术研究”（JP14028)。
第一作者简介：王秀玲，高级工程师，1973年生，1994年毕业于西北大学，现在主要从事围井水泥浆体系的研究工作。
电话13939361820；E-mail：13939361820@163.com。万方数据