MMH钻井液能提高机械钻速、保持井壁稳定,解决了复杂地层及特殊井的钻井及保护油气层等问题。但传统的降滤失剂对MMH钻井液的降滤失效果不理想,尤其是在华北油田南部地区,地层中含有丰富的石膏层,用CMC、CMS和SPNH等虽然能降低滤失量,但这些降滤失剂带有很强的负电性,对MMH钻井液会产生一定的影响。为此,研制出了BXJ降滤失剂。通过在3口井中试用,取得了良好的效果,满足了该地区的钻井施工要求。 MMH drilling fluid can increase ROP, keep the borehole stable, and solve complex formation and special well drilling and oil and gas reservoir protection. However, the traditional fluid loss reducer is not ideal for the filtration loss of MMH drilling fluid. Especially in the southern part of Huabei Oilfield, the formation contains abundant gypsum layers. Although CMC, CMS and SPNH can reduce the fluid loss, These fluid loss additives are highly negatively charged and can have an impact on MMH drilling fluids. To this end, developed a BXJ filtrate reducer. Through the three wells in the trial, and achieved good results, to meet the drilling requirements in the region.