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新型隔离液系统 保驾护航固井作业

新型隔离液系统 保驾护航固井作业

BHGE推出的新型固井隔离液系统在复杂地层固井中可帮了大忙了!

来自 | BHGE
编译 | TOM 惊蛰

BHGE近日推出了SealBond固井隔离液系统,该技术能够解决漏失问题,减少替浆后的水泥沉降问题,防止了诱发漏失问题的发生,同时也避免了费用高昂的固井补救工作。

在具有临界破裂梯度的井中,SealBond隔离液技术能保证标准水泥浆设计和比重得以合理运用,而在以往作业中则需要高窗口比重或特殊轻水泥浆。同时不需要在稠化时间和水泥抗压强度上做出妥协了。非常适用于脆弱、胶结不好和裂缝性地层。

SealBond隔离液系统最大限度的降低了固井过程中滤液对地层的侵入和伤害,以及诱发的漏失问题。基于低侵入流体技术,SealBond在近井壁区域形成了一道加固井壁的屏障以达到长期层间隔离的目的。该系统具有几乎100%回渗性能,让地层的完整性保持在了最优化生产开采的水平。

贝克公司BHGE的SealBond Plus添加剂能提升隔离液系统在严重漏失或全漏失情况下的应用效果。此外,这种添加剂可以附着在漏失层位,保持完整性。SealBond Plus添加剂技术是一项将有机物、可降解技术以及堵漏材料100%混合的专有技术。该技术的应用已经过现场论证,可以用于渗透率高达3500达西单位的地层堵漏。

根据固井隔离液系统的最新进展,相比于以前的隔离液几乎提高了一倍,SealBond Ultra隔离液系统在隔离和堵孔能力方面,同时还保持着良好的高温流变性,并且提高泥浆和水泥的配伍性。

另外,SealBond Ultra隔离液系统通过优化流态、密度和化学驱动性能可以有效地去除井里的已经胶凝的钻井液,从而达到在水泥就位前清洗井眼的目的。基于其出色的应用性能,SealBond适用于高温地层、高渗透地层、低破裂梯度的地层以及脆弱性地层等极端作业环境。

相对于传统技术,SealBond具有许多应用优势:其可以形成一道可最大限度减少滤液对地层侵害的屏障,实现可预测和有效的隔离。针对地层破裂压力梯度限制水泥密度的井时,可以在套管鞋处增加ECD,减少水泥漏失和地层伤害,防止水泥就位后沉降,优化井眼清洗效果,而且其几乎与所有的水泥系统和钻井流体都适用,显著降低HSE风险的。

案例研究

一个肯尼亚的固井公司准备一口7in新井的套管固井工作。然而在下套管时,遇到了严重漏失的问题,下完每根套管后必须重新建立循环。意味着这口井的破裂压力梯度比之前预想的要低,随后的分析也证实了这一点。显然,之前的固井设计肯定会超过地层破裂压力梯度,并且会导致漏失和层位封隔失败。在距离预定固井工作仅有两天的时候,BHGE重新设计了一份能够实现必要的层位隔离和防止漏失的方案。

BHGE作业团队重新设计了固井水泥浆,并运用CemFACTS和WellTemp软件对新数据进行了分析,最后推荐在SealBond LT 水泥隔离液系统中按照每桶添加10磅比例,添加SealBond Plus添加剂。新系统在地层表面形成了一个防渗透屏障,可以减轻固井过程中漏失问题,减少水泥损失以及降低地层伤害。该技术能减少滤液侵入,防止水泥沉降,增加因破裂梯度导致水泥密度受限的井的管鞋处的ECD。另外,在固井操作时需要伴随着水泥浆按照1磅/桶的比例泵入纤维堵漏剂来减轻固井时的漏失。

由于地层破裂梯度较低、地层需封隔(固井)长度达到了2202m,这项新方案需要通过使用分级箍来完成。通过与工具服务商讨论,确认了分级箍的内孔直径(28mm)。针对这种情况,专门制定了一种加有堵漏剂的水泥浆,而且堵漏材料适合通过已知工具(分级箍)被泵入。

固井工作完成后,尽管水泥浆比重降低,后期测井显示胶结质量良好、层位分隔成功,且水泥返高与计划一致。这次固井工作没有产生NPT,测井显示在所有储层之间均有足够的胶结水泥。

固井质量和有效的层位隔离对高渗透地层来说挑战较大。在哥伦比亚,一个固井公司就碰到了有井下漏失和安全风险的可能高渗透沙岩层。在下入井生产尾管前,需要对其可行性进行评估并提出合理的建议。BHGE对该区块以前的工作进行了全面彻底的评价,同时进行模拟优化固井工作,以提高固井效果和实现有效层位分隔。

通过观察过往固井评价记录发现,高渗地层会影响固井。另外,在生产尾管工作前的准备工作时,固井评价发现高质量水泥仅出现在目标层位上下。考虑到这些,BHGE推荐使用了SealBond系统。相比以前的体系,它的密封能力几乎翻倍, 通过密封直径高达1mm的天然裂缝来保证固井有效实施,并实现有效层位分隔,消除渗透地层的影响。

 生产尾管的固井工作最终按照设计顺利完成。在固井工作中,BHGE保证了很好的流体返出,固井质量通过固井后的测量确认为良好。

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