摘要
油基钻井液漏失严重降低了钻井作业的效益,而油基钻井液常用堵漏方式单一,堵漏成功率低.针对这一问题,本文优选出改性纤维棉(吸油棉纤维与抗静电复合纤维混合物)、刚性树脂、石英砂+云母(1∶1)、硅藻土分别作为柔性纤维材料、刚性颗粒、渗滤填充颗粒、助滤剂.通过 4种材料的不断复配优选,最终得到高滤失复合堵漏剂基本配方为5%改性纤维棉(0.5～3.0 mm)+40%刚性树脂(200 目)+50%渗滤填充颗粒(400 目)+5%助滤剂(200 目).该高滤失复合堵漏剂在油基钻井液中悬浮稳定性好,1 mm缝板承压能力为 5 MPa.高滤失复合堵漏剂在封堵效果方面展现出卓越的性能,能够快速滤失形成高强度封堵塞.高滤失复合堵漏剂弥补了油基钻井液缺少高失水堵漏手段及相关堵漏材料,为油基钻井液堵漏提供了新方法.
Abstract
Oil-based drilling fluid leakage is a serious reduction in the effectiveness of drilling operations,while the oil-based drilling fluid commonly used in a single plugging method,plugging the leakage of a low success rate.In this paper,modified fibre cotton(a mixture of oil-absorbent cotton fibres and antistatic composite fibres),rigid resin,quartz sand+mica(1∶1),and diatomaceous earth are preferred as flexible fibre materials,rigid par-ticles,percolation filler particles,and filter aids,respectively.Through the continuous com-pounding and selection of the four materials,the basic formula of the high filtration compos-ite plugging agent was finally obtained as follows,5%modified fibre cotton(0.5～3.0 mm)+40%rigid resin(200 mesh)+50%percolating filler particles(400 mesh)+5%filter aid(200 mesh).The high filtration composite plugging agent has good suspension stability in oil-based drilling fluid,and the pressure-bearing capacity of 1 mm seam plate is 5 MPa.High filtration composite plugging agent in the blocking effect shows excellent performance,can be quickly lost to form a high-strength blocking plug.High filtration composite plugging agent makes up for the lack of high water loss plugging means and related plugging materials for oil-based drilling fluids,providing a new method for oil-based drilling fluid plugging.
维普
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