碳酸钙粒径匹配对储层保护效果的影响研究
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摘要
针对低渗储层在钻井过程中由于固相或者液相的侵入容易对储层造成严重伤害的问题,采用在无固相钻开液体系中加入碳酸钙能够有效地提高钻开液的暂堵性能,防止聚合物"胶液"对储层的伤害。选取5种不同粒径的碳酸钙,从固相封堵及粒径匹配2个方面开展研究,结果表明,在选择碳酸钙作为暂堵剂时,需要选择粒径分布窄、酸溶率高的碳酸钙。在低渗储层中,碳酸钙粒径越细,封堵效果越好,其渗透率恢复值达到90%以上,具有较好的储层保护效果。
In consideration of solid or liquid invasion during drilling in low permeability reservoirs,serious damage was easily be caused in the reservoirs.However,JQWY was added into the non-solid spud-in fluid system to effectively improve the temporary plugging performance of the spud-in fluid to prevent formation damage induced by the polymer "glue".In this paper,the solid plugging and grain size matching are studied by choosing the calcium carbonate with different sizes.Experiments show that when choosing the calcium carbonate,it is necessary to have the calcium carbonate with narrow range of particle sizes and high acid solubility.In the low permeability reservoirs,the finer the calcium carbonate size is,the better effect of its plugging is,its permeability recovery ratio is up to 90%,therefore it has better effect of formation protection.
In consideration of solid or liquid invasion during drilling in low permeability reservoirs,serious damage was easily be caused in the reservoirs.However,JQWY was added into the non-solid spud-in fluid system to effectively improve the temporary plugging performance of the spud-in fluid to prevent formation damage induced by the polymer "glue".In this paper,the solid plugging and grain size matching are studied by choosing the calcium carbonate with different sizes.Experiments show that when choosing the calcium carbonate,it is necessary to have the calcium carbonate with narrow range of particle sizes and high acid solubility.In the low permeability reservoirs,the finer the calcium carbonate size is,the better effect of its plugging is,its permeability recovery ratio is up to 90%,therefore it has better effect of formation protection.
引文
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[2]罗向东,罗平亚.屏蔽式暂堵技术在储层保护中的应用研究[J].钻井液与完井液,1992,9(2):19~27.
[3]邱正松,张世锋,黄维安,等.“多级孔隙最优充填暂堵方法”与现场试验[J].石油钻探技术,2012,40(5):17~21.
[4]艾贵成,刘梅全,张禄远,等.“理想充填理论”——d90经验规则在昆2井中的应用[J].钻井液与完井液,2006,23(5):14~17.
[5]雍富华,鄢捷年.保护裂缝-孔隙性储层的钻井液技术[J].钻井液与完井液,2001,18(2):6~9.
[6]张艳娜,孙金生,王倩,等.国内外钻井液技术新进展[J].钻井工程,2011,31(7):47~53.
[7]李志勇,蒋官澄,谢水祥,等.碳酸钙表面改性及在新型钻井完井液中的应用[J].石油天然气学报(江汉石油学院学报),2011,33(3):98~102.
[8]杜鹤,张遂安,徐代才,等.煤层气多分支水平井防塌可降解屏蔽暂堵钻井液研究[J].中国煤层气,2010,7(1):30~41.
[9]马平平,熊开俊,杨荣奎,等.理想充填理论在吐哈油田温西三区块的应用[J].天然气勘探与开发,2012,35(2):57~60.
[10]张统得,陈礼仪,贾军,等.汶川地震断裂带科学钻探项目钻井液技术与应用[J].探矿工程(岩土钻掘工程),2014,41(9):139~145.
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