环保型抗高温复合抗泥包润滑剂的制备及应用

Preparation and Performance Evaluation of Environment-friendly Anti-high Temperature Composite Anti-mud-bag Lubricant

在深井、超深井和超长水平段井的开发过程中,钻进时摩阻高、扭矩波动大和托压频繁等难题严重影响了施工进度。随着环保法的深入实施,对水基钻井液的抗温、环保和润滑性能要求也日益提高。为解决以上技术难题,通过胶束共聚法合成了一种具有多识别位点的共聚物,并通过插层纳米石墨,研发出一种新型的微纳米石墨-高分子复合抗泥包润滑减阻剂,该产品兼具防泥包和润滑的双重性能,产品抗温不小于160℃,荧光级别小于2,润滑系数降低率达85.0%,钻井液滤液的表面张力低于25 mN·m。接触角和X-射线光电子能谱结果表明,该润滑剂相比于水会优先吸附在钢片表面呈现疏水状态,并与Fe元素形成稳定的配位作用,从而提高润滑性能。

With the development of exploration and development in the direction of deep well,ultra-deep well and ultra-long horizontal section,the formation is complex during drilling.In view of the technical difficulties such as the formation with high mud content and strong hydration easily producing bit mud pack,as well as the high frictional resistance,high torque fluctuation and frequent supporting pressure during drilling in long horizontal section,which seriously affect the construction progress,a kind of copolymer with multiple recognition sites was synthesized by micellar copolymerization,and a new type of micro-nano graphitepolymer composite anti-mud-bag lubricant and drag reducer was developed by intercalating nano-graphite,the results of contact angle and x-ray photoelectron spectroscopy show that the lubricant adsorbs on the surface of the steel sheet preferentially than water,and has a stable coordination with Fe,to improve lubrication.The temperature resistance is more than 160℃,the fluorescence grade is less than 2,the lubricating coefficient of base mud with 0.5%lubricant is reduced by 80.0%,and the surface tension of filtrate of drilling fluid is lower than 25 mN/m.The product has significant potential application value in the exploration and development of deep oil and gas.