石油树脂钻井液用页岩抑制剂的研制

Preparation of Petroleum Resin Shale Inhibitors for Drilling Fluid

以C9石油树脂和芳烃油为主要调和原料,采用沥青类页岩抑制的制备工艺,经过调和、乳化和稳定化的制备步骤,获得了石油树脂钻井液用页岩抑制剂。结果表明,石油树脂页岩抑制剂在不增加钻井液黏度的同时,可有效抑制黏土膨胀和分散、降低滤失量、增强抗盐污染能力,且与不同钻井液的配伍性好;常温下当抑制剂添加质量分数为2%时,钻井液失水量减少18%,岩心膨胀量相对降低率较乳化沥青提高7.4%。表明石油树脂钻井液用页岩抑制剂是一种性能优良的石油天然气钻井中上部地层的页岩抑制剂。

The emulsified asphalt products have many disadvantages when being used as shale inhibitors for drilling fluid,such as high colloid content,poor stability,serious pollution,poor dispersion and poor anti-collapse.In this work,a C9 petroleum resin and an aromatic oil were used as the main blending raw materials.The preparation procedure is similar to the conventional preparation method of asphaltic-type shale stabilizer.After the sequential steps of blending,emulsification and stabilization,a new type petroleum resin shale inhibitor(PRSI)was obtained.Results showed that PRSI could inhibit shale swelling,dispersion,and reduce the filtration loss.In addition,PRSI had good compatibility with other additives and did not affect the rheological properties of drilling fluid.When the mass fraction of PRSI was 2%,the water loss of drilling fluid decreased by 18%,and the relative reduction rate of core expansion was 7.4%higher than that of the emulsified asphalt.As a shale stabilizer,it has a good application prospect in oil and gas drilling.