泥页岩层井壁稳定问题与钻井液体系的优化——以伊拉克格拉芙油田为例
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摘要
伊拉克格拉芙油田的地层岩性复杂,其中新近系-古近系地层存在大段盐膏层、Mishrif石灰岩地层与泥页岩,钻井过程中易出现阻卡、漏失等复杂情况。针对该油田的地层岩性特点,分析了影响井壁稳定的因素。通过优选抑制剂配制强抑制防塌钻井液体系,综合运用化学抑制、物理封堵及控制合理盐度等手段,加强随钻防漏和堵漏措施,克服页岩层、盐膏层、石灰岩地层的井壁失稳问题。现场实践表明,强抑制防塌钻井液具有低黏度、低密度、低固相、低失水量和高动切力等特性,且有良好的抗盐、抗污染能力,在造斜段和水平段表现出良好的封堵能力和抑制能力,可以满足伊拉克格拉芙油田钻井的需要。
The stratigraphic lithology of the Garraf Oilfield in Iraq is complex. There are large salt paste layers, Mishrif limestone strata and mud shale in the Neogene-Paleogene strata, which are prone to complications such as blockage and leakage during drilling. According to the characteristics of the lithology of the oilfield, the factors affecting the stability of the borehole wall are analyzed. Through the use of preferred inhibitors, chemical suppression, physical plugging and reasonable salinity control are used to study the strong inhibition of the anti-collapse drilling fluid system and strengthen the drilling while drilling. Leak-proof and plugging measures have better overcome the problem of wellbore instability in shale, salt, and limestone formations. The practice shows that the strong anti-collapse drilling fluid has the characteristics of low viscosity, low density, low solid phase, low water loss and high dynamic shear force, and has good salt and pollution resistance, in the inclined section and horizontal section. It shows good sealing ability and restraining ability, which can meet the needs of drilling in the Graf oil field in Iraq.
The stratigraphic lithology of the Garraf Oilfield in Iraq is complex. There are large salt paste layers, Mishrif limestone strata and mud shale in the Neogene-Paleogene strata, which are prone to complications such as blockage and leakage during drilling. According to the characteristics of the lithology of the oilfield, the factors affecting the stability of the borehole wall are analyzed. Through the use of preferred inhibitors, chemical suppression, physical plugging and reasonable salinity control are used to study the strong inhibition of the anti-collapse drilling fluid system and strengthen the drilling while drilling. Leak-proof and plugging measures have better overcome the problem of wellbore instability in shale, salt, and limestone formations. The practice shows that the strong anti-collapse drilling fluid has the characteristics of low viscosity, low density, low solid phase, low water loss and high dynamic shear force, and has good salt and pollution resistance, in the inclined section and horizontal section. It shows good sealing ability and restraining ability, which can meet the needs of drilling in the Graf oil field in Iraq.
引文
[1] 李留伟.蠕变岩层段井眼缩径机理研究[D].南充:西南石油大学,2005.
[2] 李吉军.鲁迈拉油田抗盐聚合物钻井液及防漏堵漏技术研究[D].大庆:东北石油大学,2013.
[3] 郝惠军,张洪伟,刘学玲,等.伊拉克Halfaya油田双分支井堵漏技术[J].钻井液与完井液,2014,31(4):44-46.
[4] 焦小光.KCl聚合醇钻井液在尼日尔Goumeri油田定向井的应用[J].重庆科技学院学报(自然科学版),2018,20(3):74-77.
[5] 袁波,汪绪刚,汪世国,等.聚磺钻井液在伊拉克艾哈代布油田水平井中的应用[J].钻井液与完井液,2001,28(3):82-84.
[6] 张翔宇.胺基硅醇强抑制封堵防塌钻井液体系研究与应用[J].天然气勘探与开发,2016,39(3):76-79.
[7] 唐文泉.泥页岩水化作用对井壁稳定性影响的研究[D].东营:中国石油大学,2011.
[2] 李吉军.鲁迈拉油田抗盐聚合物钻井液及防漏堵漏技术研究[D].大庆:东北石油大学,2013.
[3] 郝惠军,张洪伟,刘学玲,等.伊拉克Halfaya油田双分支井堵漏技术[J].钻井液与完井液,2014,31(4):44-46.
[4] 焦小光.KCl聚合醇钻井液在尼日尔Goumeri油田定向井的应用[J].重庆科技学院学报(自然科学版),2018,20(3):74-77.
[5] 袁波,汪绪刚,汪世国,等.聚磺钻井液在伊拉克艾哈代布油田水平井中的应用[J].钻井液与完井液,2001,28(3):82-84.
[6] 张翔宇.胺基硅醇强抑制封堵防塌钻井液体系研究与应用[J].天然气勘探与开发,2016,39(3):76-79.
[7] 唐文泉.泥页岩水化作用对井壁稳定性影响的研究[D].东营:中国石油大学,2011.