新型水玻璃单液法耐酸硬性堵剂

NOVEL ACID RESISTANT HARD BLOCKING AGENT MADE OF WATER GLASS BY SINGLE FLUID METHOD

概述了新型水玻璃单液法耐酸硬性堵剂的堵水机理、室内试验及现场应用情况。该堵剂克服了以往该类堵剂强度低、封堵率低、耐温性差等缺点 ,因初凝与终凝时间长 ,能确保带工具施工的安全 ,同时添加剂的加入保证堵剂不突进 ,形成堵塞较均匀 ,强度高 ,耐酸性好 ,使用该堵剂可避免以后生产过程中对油井解堵施工需下封隔器保护堵层。该堵剂耐温性好 ,有效期长 ,粘度低 ,既适用于油井封堵水层 ,也可通过控制排量实现对底水油层选则性堵水。与其它堵剂相比施工压力低 ,这对于套管强度低的老井和薄夹层油井堵水更有特殊意义。该堵剂还具有耐酸性 ,可实现对层间矛盾突出的水井进行高渗层封堵和低渗层酸化增注 ,达到调整注水剖面的目的。

The working mechanism, laboratory test and field using of a novel water glass blocking agent is described, and it is made of water glass using single fluid method. In contrary to the conventional blocking agent, which has poor strength, low blocking rate and poor temperature tolerance, the new blocking agent has many advantages. It has long initial and terminal setting time, which ensures the safety operation with tools in the hole. by adding a certain kind of additive, the blocking agent can form even blocking without onrushing, and it has higher strength and good acid resistance, this eliminates the use of packer for formation protection during plugging resolving operation. Further more, it has high temperature tolerance, long valid period and low viscosity, thus it is suitable for sealing the water zones and can also be used for selective water blocking to bottom water production zones by controlling pumping rate. As compared with other water blocking agents, it needs lower operation pressure, which is good for water blocking in the depleted wells with casing of low strength and in the wells with thin bedded reservoirs. In addition, for wells of extrusive inter formation inconsistencies, the higher acid resistance of the blocking agent makes it possible to conduct water blocking operation to the high permeable formations and acidizing operation to the low permeable formations, thus realizes the aim of adjusting water injection profiles.