新型钻井液用成膜封堵剂CMF的研制及应用
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摘要
针对渤海辽东湾某油田地层硬脆性泥页岩裂缝发育特点,笔者通过控制反应条件,制备了平均长径比在20～30之间的三水碳酸镁晶须和水合碱式碳酸镁晶片,并在此基础上与常用成膜剂LPF-H复配,研制了一种新型成膜封堵剂CMF,其中LPF-H∶晶须∶晶片的配比为7.0∶1.6∶0.4。室内实验结果表明,成膜封堵剂CMF与钻井液体系具有良好的配伍性,流变性能能够满足携岩屑要求,对不同渗透率砂盘的封堵能力优于常用成膜剂LPF-H。晶须、晶片与LPF-H这三种材料相互协同作用,在井壁形成一层致密、具有一定强度韧性的隔离膜,能有效封堵地层裂隙,稳定井壁,降低钻井液处理剂的损耗。该成膜封堵剂CMF在渤海辽东湾某油田X-1井进行了现场试验,结果表明,加入成膜封堵剂CMF后,钻井液性能满足要求,滤失量和表皮系数均低于采用成膜剂LPF-H的邻井X-2。这说明,成膜封堵剂CMF能够满足该油田钻井过程中储层保护的需要,具有推广应用前景。
A new filming plugging agent, CMF, has been developed to deal with the problems encountered in drilling the brittle fractured shale formations in an oilfield in the Liaodong Gulf area. CMF is formulated with nesquehonite whisker, hydrated basic magnesium carbonate wafer and a commonly used filming agent LPF-H. The nesquehonite whisker and the hydrated basic magnesium carbonate wafer, having length/diameter ratios of 20-30, were developed under controlled reaction conditions. The ratio of LPF-H, the whisker and the wafer is 7∶1.6∶0.4. Laboratory experimental results showed that CMF has good compatibility with the drilling fluid treated with it, and the rheology of the drilling fluid is able to satisfy the needs of cuttings carrying. Experiment on sand specimens of different porosity showed that CMF is superior to LPF-H in plugging the sand specimens. The synergism of the whisker, the wafer and LPF-H results in a dense and tough film on the borehole wall, effectively plugging the formation fractures and stabilizing the borehole wall, and therefore reducing the consumption of drilling fluid additives. Application of CMF on the well X-1 in an oilfield in Liaodong Gulf showed that the properties of the drilling fluid treated with CMF satisfied the needs of drilling operations. The filtration rate of the drilling fluid was lower than that of the drilling fluid(treated with LPF-H) used on the adjacent well X-2, indicating that CMF is able to protect the reservoir from being damaged, and is therefore worth spreading.
A new filming plugging agent, CMF, has been developed to deal with the problems encountered in drilling the brittle fractured shale formations in an oilfield in the Liaodong Gulf area. CMF is formulated with nesquehonite whisker, hydrated basic magnesium carbonate wafer and a commonly used filming agent LPF-H. The nesquehonite whisker and the hydrated basic magnesium carbonate wafer, having length/diameter ratios of 20-30, were developed under controlled reaction conditions. The ratio of LPF-H, the whisker and the wafer is 7∶1.6∶0.4. Laboratory experimental results showed that CMF has good compatibility with the drilling fluid treated with it, and the rheology of the drilling fluid is able to satisfy the needs of cuttings carrying. Experiment on sand specimens of different porosity showed that CMF is superior to LPF-H in plugging the sand specimens. The synergism of the whisker, the wafer and LPF-H results in a dense and tough film on the borehole wall, effectively plugging the formation fractures and stabilizing the borehole wall, and therefore reducing the consumption of drilling fluid additives. Application of CMF on the well X-1 in an oilfield in Liaodong Gulf showed that the properties of the drilling fluid treated with CMF satisfied the needs of drilling operations. The filtration rate of the drilling fluid was lower than that of the drilling fluid(treated with LPF-H) used on the adjacent well X-2, indicating that CMF is able to protect the reservoir from being damaged, and is therefore worth spreading.
引文
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[2]朱宽亮,卢淑芹,刑韦亮,等.南堡1-3人工岛钻井液技术[J].石油钻探技术,2010,38(3):54-58.ZHU Kuanliang,LU Shuqin,XING Weiliang,et al.Drilling fluid system used in Nanpul-3 artificial island[J].Petroleum Drilling Technoques,2010,38(3):54-58.
[3]贺明敏,蒲晓林,苏俊霖,等.水基成膜钻井液的保护油气层技术研究[J].钻采工艺,2010,33(5):93-95.HE Mingmin,PU Xiaolin,SU Junlin,et al.Research on reservoir protection technology of water basis film-forming drilling fluid[J].Drilling&Production Technology,2010,33(5):93-95.
[4]孙金声,张希文.钻井液技术的现状、挑战、需求与发展趋势[J].钻井液与完井液,2011,28(6):67-76.SUN Jinsheng,ZHANG Xiwen.Situations,challenges,demands and trends of drilling fluid technology[J].Drilling Fluid&Completion Fluid,2011,28(6):67-76.
[5]陈二丁,周辉.成膜强抑制纳米封堵钻井液的研究[J].钻井液与完井液,2011,28(3):39-41.CHEN Erding,ZHOU Hui.Research of high inhibition film-forming nano-sealing drilling fluid[J].Drilling Fluid&Completion Fluid,2011,28(3):39-41.
[6]李海涛,赵修太,龙秋莲,等.镶嵌剂与成膜剂协同增效保护储层钻井液室内研究[J].石油钻探技术,2012,40(4):65-71.LI Haitao,ZHAO Xiutai,LONG Qiulian,et al.Laboratory study on drilling fluid of mosaic agentmembrane agent synergistic interaction for reservoir protection[J].Petroleum Drilling Techniques,2012,40(4):65-71.
[7]苏俊霖,蒲晓林,任茂,等.抗高温无机/有机复合纳米降滤失剂室内研究[J].断块油气田,2012,19(5):626-628.SU Junlin,PU Xiaolin,REN Mao,et al.Research on inorganic/organic composite-nano fluid loss additive resistant to high temperature[J].Fault-Block Oil&Gas Field,2012,19(5):626-628.
[8]张朔,蒋官澄,郭海涛,等.新型钻井液成膜剂的研制及其在埕海油田的应用[J].石油钻探技术,2013,41(2):44-48.ZHANG Shuo,JIANG Guancheng,GUO Haitao,et al.Development of new film-forming agent for drilling fluids and application in Chenghai oilfield[J].Petroleum Drilling Techniques,2013,41(2):44-48.
[9]张凤英,鄢捷年,杨光,等.理想充填暂堵新方法在吐哈丘东低渗透气田的应用[J].钻采工艺,2009,32(6):88-90.ZHANG Fengying,YAN Jienian,YANG Guang,et al.Application of a new ideal packing temporary plugging method in tuha low permeability reservoir[J].Drilling&Production Technology,2009,32(6):88-90.
[10]WANG J,SUN J,FENG J,et al.The novel model for the invasion of particles and the filtrate of drilling fluids[C]//International Oil and Gas Conference and Exhibition in China.Society of Petroleum Engineers,2010.
[11]张凤英,鄢捷年,李志勇.钻井过程中暂堵剂颗粒尺寸优选研究[J].西南石油大学学报(自然科学版),2011,33(3):130-132.ZHANG Fengying,YAN Jienian,LI Zhiyong.The Application of optimizing particle size of grain blocking agents in the drilling process[J].Journal of Southwest Petroleum University(Seience&Technology Edition),2011,33(3):130-132.
[12]蒋官澄,毛蕴才,周宝义,等.暂堵型保护油气层钻井液技术研究进展与发展趋势[J].钻井液与完井液,2018,35(2):1-16.JIANG Guancheng,MAO Yuncai,ZHOU Baoyi,et al.Progress made and trend of development in studying on temporarily type plugging reservoir protection drilling fluids[J].Drilling Fluid&Completion Fluid,2018,35(2):1-16.