合成基钻井液堵漏剂BSD-II的研究

Research on a Synthetic-Based Drilling Fluid Plugging Agent BSD-II

摘要: 合成基钻井液漏失问是石油钻探作业过程中一直未能解决的技术难题。目前现场用堵漏材料存在形变能力差、与合成基钻井液相容性不好、在漏失层滞留时间短、不能够形成有效封堵等，在处理井漏时易造成反复漏失，严重时引起堵漏失败。室内配制了一种合成基钻井液，制备了一种合成基钻井液可酸化固结型堵漏剂BSD-II，其基本组成如下：65%~70%强度调节剂B，10%~15%活化剂S，15%~20%密度调节剂D。性能评价表明，该堵漏剂可以抗15%的合成基钻井液污染，酸溶性能好，可以与其它膨胀性聚合物复配使用。BSD-II单独使用可封堵2.0 mm × 1.0 mm裂缝和2.0 mm × 2.0 mm裂缝，承压能力为15 MPa和12 MPa；BSD-II与遇水膨胀性聚合物复配使用，可封堵3.0 mm × 2.0 mm裂缝，保证堵漏后的承压能力至15 MPa，具有一定的应用前景。

Abstract: The leakage of synthetic-based drilling fluid is a technical problem that has not been solved in the process of oil drilling operations. At present, the plugging materials used in the field have poor deformation ability, poor compatibility with synthetic-based drilling fluids, short retention time in the leakage layer, and inability to form effective plugging, etc., which are easy to cause repeated leakage when dealing with well leakage, and cause leak plugging failure in serious cases. A synthetic-based drilling fluid was prepared in the laboratory, and a synthetic-based drilling fluid acidifying and consolidating plugging agent BSD-II was prepared, and its basic composition is as follows: 65%~70% strength condition agent B, 10%~15% activator S, 15%~20% density regulator D. The performance evaluation shows that the plugging agent can resist 15% of the pollution of synthetic drilling fluid, has good acid solubility, and can be used in combination with other expansive polymers. BSD-II can plug 2.0 mm × 1.0 mm cracks and 2.0 mm × 2.0 mm cracks alone, and the pressure bearing capacity is 15 MPa and 12 MPa; BSD-II can be used in combination with water-exposed expansive polymer, which can seal 3.0 mm × 2.0 mm cracks and ensure the pressure bearing capacity of 15 MPa after plugging, which has certain application prospects.