塔河油田长裸眼井段聚胺钻井液研究及应用

发布时间：2019-03-07 22:12

【摘要】：塔河油田长裸眼井段钻井过程中井壁稳定问题突出。通过分析代表性岩样的组构和理化性能,结合现场施工情况,初步确定塔河油田长裸眼井段井壁失稳机理,提出相应的钻井液技术对策:以聚胺强抑制剂为关键处理剂,分别针对塔河油田上、下部地层特征,室内优化出2套防塌钻井液配方。其中上部地层为聚胺聚合物钻井液体系,可分别抗(质量分数)10%NaCl、5%劣土、1%CaCl_2、1%CaSO_4的污染,岩屑回收率大于75%;下部地层为聚胺聚磺钻井液,可分别抗(质量分数)5%NaCl、5%劣土、1%CaCl_2、1%CaSO_4的污染,岩屑回收率大于85%。现场应用结果表明,优化的聚胺聚合物钻井液能有效抑制上部地层的水化膨胀,试验井段平均井径扩大率为4.47%;聚胺聚磺钻井液能有效防止下部地层的剥落掉块,提高井壁稳定性,试验井段平均井径扩大率为9.42%,有效解决了长裸眼井段的阻卡、剥落掉块等问题,提高了钻井综合效益。
[Abstract]:The problem of well wall stability during the drilling of the long bare-hole section in Tahe Oilfield is outstanding. Based on the analysis of the texture and the physical and chemical properties of the representative rock samples, the mechanism of the wall instability of the long bare-hole section in the Tahe Oilfield is preliminarily determined by analyzing the construction of the site, and the corresponding drilling fluid technical countermeasures are put forward: the polyamine strong inhibitor is a key treatment agent, and is respectively applied to the Tahe oil field, The lower formation is characterized by a 2-casing anti-collapse drilling fluid formula. The upper formation is a polyamine polymer drilling fluid system, which can be respectively resistant to (mass fraction)10% NaCl,5% poor soil,1% CaCl _ 2,1% CaSO _ 4, and the recovery of rock cuttings is greater than 75%; the lower formation is a polyamine polysulfonate drilling fluid, and the pollution of 5% NaCl,5% poor soil,1% CaCl _ 2 and 1% CaSO _ 4 can be respectively applied to the lower stratum. The recovery of rock cuttings is more than 85%. The field application results show that the optimized polyamine polymer drilling fluid can effectively inhibit the hydration and expansion of the upper formation, the average well diameter of the test well section is 4.47%, and the polyamine polysulfonate drilling fluid can effectively prevent the stripping of the lower formation and improve the stability of the well wall. The average well diameter expansion rate of the test well section is 9.42%, and the problems of blocking and peeling off the block and the like of the long bare hole section are effectively solved, and the comprehensive benefit of the drilling is improved.
【作者单位】：中国石油大学(华东)石油工程学院;西部钻探准东钻井泥浆技术服务公司;
【基金】：国家科技重大专项项目“深井超深井优质钻井液与固井完井技术研究”(2016ZX05020-004)
【分类号】：TE254

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