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针对聚合物钻井液体系低剪切速率下粘度偏低的问题,室内通过实验,优选了提切剂的加量、膨润土的含量、润滑剂的加量以及降失水剂的含量,最终确定了保护储层的高效低伤害钻井液配方为:4%土浆+0.2%PF-Plus+0.2%Drispac(HV)+0.5%TQJ+3%RHJ+1.5%DFD+0.5%NH4-HPAN+4%KCl,并进行了储层保护性能评价,实验结果表明:岩心经优选的钻井液体系污染后,渗透率恢复值高于75%,同时将污染端面切去1cm左右后,渗透率恢复值基本恢复到原始状态,平均渗透率恢复值达到93.8%。
In view of the problem of low viscosity at low shear rate of polymer drilling fluid system, experiments were conducted indoors to determine the optimal amount of additive, bentonite, lubricant, and fluid loss additive High-performance and low-harm drilling fluid formulations for reservoir protection are as follows: 4% slurry + 0.2% PF-Plus + 0.2% Drispac (HV) + 0.5% TQJ + 3% RHJ + 1.5% DFD + 0.5% NH4- HPAN + 4% KCl, and the reservoir protection performance was evaluated. The experimental results show that after the core is contaminated by the preferred drilling fluid system, the permeability recovery value is higher than 75% and the permeability recovery value basically restores after cutting the contaminated end face about 1cm To the original state, the average permeability recovery value reached 93.8%.