南苏丹Palouge油田滤饼清除技术
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摘要
南苏丹Palouge油田水平井采用筛管完井,无法彻底清除筛管和井壁上的钻井液滤饼,致使油井产量达不到预期产量。为此,针对Palouge油田储层具有弱盐敏性、中度水敏性,酸敏性和碱敏性不明显的特性及该油田所用Drill-in钻井液主要由可降解的有机处理剂、碳酸钙和聚合醇组成的情况,选用酸性滤饼清除剂HBK-Lb,并优选缓蚀剂及加量,形成了酸性滤饼清除完井液。室内性能评价结果:酸性滤饼清除剂HBK-Lb对Drill-in钻井液API滤饼和筛网滤饼的清除率达到90%以上;酸性滤饼清除完井液可以清除岩心内外的滤饼;酸性滤饼清除完井液静态污染岩心的渗透率恢复率≥97.0%,动态污染岩心的渗透率恢复率≥102.3%。Palouge油田的6口油井完井时应用了酸性滤饼清除完井液,完井液漏失速度随浸泡时间增长增快,说明滤饼被清除掉,完井后单井产能与未应用酸性滤饼清除完井液的邻井相比平均增加了12.4%。研究表明,酸性滤饼清除完井液不但能解除Plalouge油田储层井壁周围的内外滤饼,而且能提高储层的渗透率。
In horizontal wells in the Palouge Oilfield,South Sudan,the filter cake of drilling fluid on the screen tube and borehole wall cannot be completely removed with screen pipes during the well completion,resulting in the inability of the well to achieve target production levels.Taking into consideration the weak salt sensitivity,moderate water sensitivity,acid sensitivity,alkali sensitivity of the Palouge Oilfield reservoir,the drill-in drilling fluids used in the oil field mainly consisted of degradable organic treating agent,calcium carbonate and polyol,the acidic remover HBK-Lb was selected,the corrosion inhibitor and its dosage were optimized to form the acidic completion fluid for removing filter cake.Indoor performance evaluation results showed that the acid remover HBK-Lb could remove API filter cake and screen cake of Drill-in drilling fluid,with a removal rate up to 90.0%.The acid completion fluid could remove filter cakes inside and outside the core.The permeability recovery rate of the core that static polluted by filter cake is higher than 97.0%,and the permeability recovery rate of the core that dynamic polluted is higher than 102.3%.The acid completion fluid for removing filter cake was applied in the six wells,the completion fluid loss rate increased with the increasing immersion time,indicating that the filter cake was removed.After completion,the well production capacity increased by 12.4%on average compared with the neighboring wells which did not use completion fluid for removing filter cake.The study demonstrated that the acid completion fluid could remove the inner and outer filter cakes around the borehole wall,and improve the permeability of reservoir in the Plalouge Oilfield.
In horizontal wells in the Palouge Oilfield,South Sudan,the filter cake of drilling fluid on the screen tube and borehole wall cannot be completely removed with screen pipes during the well completion,resulting in the inability of the well to achieve target production levels.Taking into consideration the weak salt sensitivity,moderate water sensitivity,acid sensitivity,alkali sensitivity of the Palouge Oilfield reservoir,the drill-in drilling fluids used in the oil field mainly consisted of degradable organic treating agent,calcium carbonate and polyol,the acidic remover HBK-Lb was selected,the corrosion inhibitor and its dosage were optimized to form the acidic completion fluid for removing filter cake.Indoor performance evaluation results showed that the acid remover HBK-Lb could remove API filter cake and screen cake of Drill-in drilling fluid,with a removal rate up to 90.0%.The acid completion fluid could remove filter cakes inside and outside the core.The permeability recovery rate of the core that static polluted by filter cake is higher than 97.0%,and the permeability recovery rate of the core that dynamic polluted is higher than 102.3%.The acid completion fluid for removing filter cake was applied in the six wells,the completion fluid loss rate increased with the increasing immersion time,indicating that the filter cake was removed.After completion,the well production capacity increased by 12.4%on average compared with the neighboring wells which did not use completion fluid for removing filter cake.The study demonstrated that the acid completion fluid could remove the inner and outer filter cakes around the borehole wall,and improve the permeability of reservoir in the Plalouge Oilfield.
引文
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[2]袁萍,谢葵,马巍,等.复合缓释型钻井液滤饼清除剂的研究与应用[J].钻井液与完井液,2011,28(4):32-35.YUAN Ping,XIE Kui,MA Wei,et al.Study and application of compound sustained-release mud cake scavenger[J].Drilling Fluid&Completion Fluid,2011,28(4):32-35.
[3]李颖颖,徐同台,王海良.水平井及多分支井钻井液滤饼的生物酶清除技术[J].钻井液与完井液,2010,27(2):74-77.LI Yingying,XU Tongtai,WANG Hailiang.Remove mud cake in horizontal and muti-lateral wells using bio-enzyme[J].Drilling Fluid&Completion Fluid,2010,27(2):27-28.
[4]李丽,刘伟,刘徐慧.川西低固相钻井完井液泥饼清除技术初探[J].钻井液与完井液,2010,27(6):27-29.LI Li,LIU Wei,LIU Xuhui.Study on filter cake removal technology of low solid drilling and completion fluids in Chuan Xi[J].Drilling Fluid&Completion Fluid,2010,27(6):27-29.
[5]ALOTAIBI M B.Optimized method to remove filter cake formed by formate based Drill-in fluid in extanded reach well[R].SPE 109754,2007.
[6]于雷,张敬辉,李公让,等.生物酶完井液的研究及在低渗油气田的应用[J].石油钻探技术,2012,40(3):33-37.YU Lei,ZHANG Jinghui,LI Gongrang,et al.Research on biologic completion fluid and it's application in low permeability oil&gas fields[J].Petroleum Drilling Techniques,2012,40(3):33-37.
[7]SIDDIQUI M A A,NASR-EL-DIN H A.Evaluation of special enzymes as a means to remove formation damage induced by Drill-in fluids in horizontal gas wells in tight reservoirs[J].SPE Production&Facilities,2005,20(3):177-184
[8]COBIANCO S,ALBONICO P,BATTISTEL E,et al.Thermophilic enzymes for filter-cake removal at high temperature[R].SPE 107756,2007.
[9]孙玉学,肖平平,曹晓春,等.甲酸盐完井液滤饼清除室内实验研究[J].当代化工,2015,44(4):715-717.SUN Yuxue,XIAO Pingping,CAO Xiaochun,et al.Experimental investigation on formate completion fluid mud cake cleaning[J].Contemporary Chemical Industry,2015,44(4):715-717.
[10]刘绪全,杨金荣,张鑫,等.Drill-in钻井液在苏丹37区水平井中的应用[J].钻井液与完井液,2012,29(2):83-85.LIU Xuquan,YANG Jinrong,ZHANG Xin,et al.Application on Drill-in drilling fluid technology in Block 37of Sudan[J].Drilling Fluid&Completion Fluid,2012,29(2):83-85.
[11]赵凤兰,鄢捷年.国外保护油气层技术新进展:关于油气层损害机理的研究[J].钻井液与完井液,2003,20(2):42-47.ZHAO Fenglan,YAN Jienian.Advances in formation damage control technology abroad:investigations on themechanisms of formation damage[J].Drilling Fluid&Completion Fluid,2003,20(2):42-47.