仿生固壁钻井液体系的研究与现场应用  

Study and Application of Bionic Borehole Wall Strengthening Agent

作　　者：蒋官澄[1] 宣扬[1] 王金树[2] 张弘[1] 张振华 彭春耀 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(华东)石油工程学院,山东青岛 [3]中国石油长城钻探钻井液分公司,北京

出　　处：《钻井液与完井液》2014年第3期1-5,95,共5页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金项目(51074173);国家自然科学创新研究群体(51221003);国家自然科学联合基金项目(U1262201);国家863主题项目(2013AA064803)

摘　　要：通过实验剖析,得知贻贝足丝线能够于水下牢固地黏附在岩石表面的最主要原因是其含有一种特殊的官能团,通过将这种官能团接枝到一种聚合醇骨架上,合成出了仿生固壁剂GBFS-1。该处理剂能够在井壁泥页岩表面固化形成具有较强黏附性和内聚力的凝胶"仿生壳",从而起到提高井壁泥页岩强度的作用,而且实验发现其无法在运移中的钻屑表面形成"仿生壳",因而不会影响仿生钻井液的携屑效果。以GBFS-1为核心处理剂配制出了仿生固壁钻井液体系。性能评价结果表明,该体系的流变性、滤失造壁性以及润滑性等满足钻井要求,防塌抑制性强,泥页岩岩屑在该钻井液中的热滚回收率达90.6%,岩心在该钻井液中热滚后抗压强度提高10.8%。该体系在苏里格气田苏53-86-15H1、苏53-86-15H和苏53-70-22H井的现场试验情况表明,3口井在钻进过程中均没有发生泥岩段卡钻等复杂情况,并且机械钻速明显高于邻井。A marine creature, mussel, secretes a kind of mytilus foot protein, containing a special functional group which enables mussel to adsorb fast on the surface of underwater rocks with its byssus. A bionic borehole wall strengthening agent, GBFS-1, was developed by grafting this functional group onto the backbone of poly glycol molecules. GBFS-1 has the adsorbing ability underwater as that of mussel, thus can adsorb itself on the surface of shale. The adsorbed GBFS-1 then crosslink and solidify, forming a gel film with high power of cohesion and adhesion, a kind of 'bionic shell'. This bionic shell seals the micro fissures and fractures in rocks and to some extent, can strengthen the rocks. Experimental study also shows that GBFS-1 cannot form 'bionic shell' on drill cuttings that are moving, thus goes not affect the carrying capacity of drilling fluid negatively. A drilling fluid was formulated using the GBFS-1, and was applied in Well Su53-86-15H1, Well Su53-86-15H and Well Su53-70-22H in Sulige Gasfield. No pipe sticking in the shale and claystone formation ever happened in the three wells, and ROP was remarkably increased compared with wells drilled nearby.

关 键 词：防塌钻井液 仿生固壁剂 井眼稳定 胶结 泥页岩 苏里格气田 

分 类 号：TE254.3[石油与天然气工程—油气井工程]