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却勒储层属于碎屑岩孔隙型,储层胶结差,易造成井壁不稳定,所采用的钻井液其井底液柱压力必须大于地层孔隙压力才能保持井壁稳定。由于在储层钻井时形成了高压差,为了保证正常钻井,并减少储层伤害,确定合适的高压差钻井液体系是很有必要的。通过研究,在聚磺钾基钻井液体系的基础上,对高分子量聚合物增粘剂、降滤失剂、加重剂进行了优选试验,确定出适合却勒储层的聚磺氯化钾钻井液配方。对所确定的钻井液进行抗温性评价和岩心抗污染试验表明,该钻井液具有较好的抗高温能力和屏蔽暂堵功能,能够满足却勒地区高压差条件下对钻井液的要求。
The Bayer reservoir belongs to the clastic rock pore type. The poor cementing of the reservoir can easily lead to instability of the borehole wall. The pressure of the liquid column in the drilling fluid used at the bottom of the well must be greater than the pore pressure of the formation to maintain the stability of the borehole wall. Due to the formation of high pressure drop during reservoir drilling, in order to ensure normal drilling and reduce reservoir damage, it is necessary to determine suitable high pressure differential drilling fluid system. Based on the research, based on the polysulfide potassium drilling fluid system, the high molecular weight polymer thickener, fluid loss reducer and weighting agent were tested in order to determine the appropriate Korla reservoir of potassium polysulfate drilling Liquid formula. The evaluation of temperature resistance and core anti-fouling of the determined drilling fluid show that the drilling fluid has better capability of high temperature resistance and shielding temporary blocking, and can meet the requirement of drilling fluid under the conditions of high pressure difference in the Korla region.