井浆改造固井隔离液的评价与应用
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摘要
随着川渝地区高温深井、超深井勘探开发的发展,固井时水泥浆与钻井液相容性差的问题日益突出,极易导致固井注水泥浆时出现变稠、结块的问题。通过对水泥浆与钻井液接触污染因素分析、研究,合成了由井浆改造不排放抗污染隔离液GLJ。经室内评价和现场投井应用表明,隔离液GLJ现场配制简单、方便,只需将隔离剂直接加入现场钻井液中即可,可减少新增液体量、钻井液加重剂等材料用量,减轻现场储存压力;GLJ具有较好的流变性、悬浮稳定性,可根据现场施工对隔离液GLJ的流变性能参数要求进行调整,具有良好的抗温性能,井筒中长时间静置不会导致隔离液GLJ重晶石沉淀;GLJ与水泥浆具有良好的配伍性,各种比例混合流体的高温高压稠化实验240 min内体系稠度值未大于40 Bc;隔离液GLJ对钻井液性能影响小,施工结束后循环罐中剩余隔离液GLJ和井筒中返出隔离液GLJ均可混入井浆中作为钻井液继续使用,减轻了现场废弃液的排放及处理量,具有良好的经济效益和社会效益。
With the advance of high temperature deep well and ultra-deep well development in Sichuan and Chongqing, the compatibility of cement slurry for well cementing with drilling fluid, which is probable to cause cement slurry to become thickened and agglomerate, is becoming more and more protruding. A pollution resistant spacer, GLJ, is developed from active mud based on the work done on the analyses of and study on the contamination factors existed in the process of cement slurry-mud contact. Laboratory evaluation and field operations show that GLJ is easy to and convenient to formulate by just adding spacer agents into active mud, thereby reducing the amount of new liquid and weighting materials required and reducing the burden of field stocks. GLJ has good rheology and suspension stability; the rheological properties of GLJ can be adjusted based on the requirements of field operations. Good thermal stability of GLJ makes it possible for GLJ to stay a long time in the borehole without barite settlement. GLJ has excellent compatibility with cement slurry; mixed fluids with different ratios of components of the fluids have consistence that is less than 40 Bc after 240 min of HTHP thickening test. The spacer GLJ has minor effect on the properties of drilling fluids. The remained GLJ in mud tanks and the GLJ returned from the borehole can all be mixed with active mud for reuse, thereby minimizing the effort required for the discharge and treatment of waste fluids, which is of good economic benefits and social benefits.
With the advance of high temperature deep well and ultra-deep well development in Sichuan and Chongqing, the compatibility of cement slurry for well cementing with drilling fluid, which is probable to cause cement slurry to become thickened and agglomerate, is becoming more and more protruding. A pollution resistant spacer, GLJ, is developed from active mud based on the work done on the analyses of and study on the contamination factors existed in the process of cement slurry-mud contact. Laboratory evaluation and field operations show that GLJ is easy to and convenient to formulate by just adding spacer agents into active mud, thereby reducing the amount of new liquid and weighting materials required and reducing the burden of field stocks. GLJ has good rheology and suspension stability; the rheological properties of GLJ can be adjusted based on the requirements of field operations. Good thermal stability of GLJ makes it possible for GLJ to stay a long time in the borehole without barite settlement. GLJ has excellent compatibility with cement slurry; mixed fluids with different ratios of components of the fluids have consistence that is less than 40 Bc after 240 min of HTHP thickening test. The spacer GLJ has minor effect on the properties of drilling fluids. The remained GLJ in mud tanks and the GLJ returned from the borehole can all be mixed with active mud for reuse, thereby minimizing the effort required for the discharge and treatment of waste fluids, which is of good economic benefits and social benefits.
引文
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[10]杨香艳,郭晓阳,杨远光,等.固井前置冲洗液的研究发展[J].西南石油学院学报,2005,27(1):70-74.YANG Xiangyan,GUO Xiaoyang,YANG Yuanguang.et al.The research and development of the well cementation preposition flushing fluid[J].Journal of Southwest Petroleum Institute,2005,27(1):70-74.
[2]万发明,吴广兴,高大勇.小井眼固井顶替效率研究[J].石油学报,2000,21(5):72-76.WAN Faming,WU Guanxing,GAO Dayong.Experimental investigation on cementing displacement efficiency of slimhole well[J].Acta Petrolei Sinica,2000,21(5):72-76.
[3]ABEND S,BONNKE N,GUTSCHNER U,et al.Stabilization of emulsions by heterocoagulation of clay minerals and layered double hydroxides[J].Colloid and Polymer Science,1998,276(8):730-737.
[4]石凤岐,陈道元,周亚军,等.超高温高密度固井隔离液研究与应用[J].钻井液与完井液,2009,26(1):47-49.SHI Fengqi,CHEN Daoyuan,ZHOU Yajun,et al.The research and application of sealing liquid for superhigh temperature and high density[J].Drilling Fluid&Completion Fluid,2009,26(1):47-49.
[5]陈永红,杨远光,李静瑞,等.XH高密度抗盐隔离液的室内研究[J].钻井液与完井液,2010,27(1):64-67.CHEN Yonghong,YANG Yuanguang,LI Jingrui,et al.Laboratory study on XH high density salt resistant spacer fluid[J].Drilling Fluid&Completion Fluid,2010,27(1):64-67.
[6]黄汉仁,杨坤鹏,罗平亚.泥浆工艺原理[M].石油工业出版社,1981.HUANG Hanren,LUO Pingya.Mud technology trinciple[M].Running Press Pook Publishers,1981.
[7]邓长明,李娟,叶晓端,等.新型DF冲洗液的研究与应用[J].天然气工业,2006,26(9):90-92.DENG Changming,LI Juan,YE Xiaoduan,et al.Research and application of a new type of fluid[J].Natrual Gas Industry,2006,26(9):90-92.
[8]张明霞,向兴金,童志能,等.水泥浆前置液评价方法总论[J].钻采工艺,2002,25(6):81-84.ZHANG Mingxia,XIANG Xingjin,TONG Zhineng,et al.General narration of the evaluation approach to the slurry’s prepad fluid[J].Natrual Gas Industry,2002,25(6):81-84.
[9]王中华,杨小华.国内钻井液用改性木质素类处理剂研究与应[J].精细石油化工进展,2009,10(4):19-22.WANG Zhonghua,YANG Xiaohua.Research and application of modified-lignin drilling fluid treatment agents[J].Advances in Fine Petrochemicals,2009,10(4):19-22.
[10]杨香艳,郭晓阳,杨远光,等.固井前置冲洗液的研究发展[J].西南石油学院学报,2005,27(1):70-74.YANG Xiangyan,GUO Xiaoyang,YANG Yuanguang.et al.The research and development of the well cementation preposition flushing fluid[J].Journal of Southwest Petroleum Institute,2005,27(1):70-74.
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