低温覆膜树脂砂在煤层压裂中的应用

针对煤层压后易出砂的情况,提出了低温覆膜树脂砂技术。该技术是在携砂液阶段后期尾追覆膜树脂砂,随后注入固化剂使树脂缩聚并固化,把分散的砂粒变成一个有机的整体,阻止支撑剂随地层流体运移而导致地层出砂。根据固结、渗流速度测试、抗压强度等实验结果,证明低温覆膜树脂砂具有固结效果好、导流能力强、抗压强度高等特点,能很好的解决支撑剂回流的问题。通过现场应用,进一步验证了低温覆膜树脂砂的防砂效果。截至到2009年11月,采用该技术现场施工15井次,施工成功率100%,防砂有效率达93.3%。

Application of Low Temperature Resin-coated Sand in Coal Seam Fracturing

Aimed at the fact of sand production after coal seam fracturing, a sand controlling method by using low temperature resin- coated sand has proposed. In the late stage of proppant laden slurry injected resin-coated sand, soon afterwards injected solidifying agent to make resin-coated sand polycondensation and harden. It can put disperse sand into an organic whole, therefore prevent proppant translate with stratum fluid causing sand production. According to the concretion, seeping speed and compressive strength experiments etc, illustrated that resin-coated sand have good consolidation, flow conductivity and higher compressive resistance, and proppant back rush has perfectly solved. Through the application on the spot, this technique has been used 15 well times by the end of November 2009.The mission success rate is 100% and the effective rate 93.3%, thus gains a good sand controlling benefit.