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在盐膏层等复杂地层钻探过程中 ,常规钻井液易受到盐、膏等的污染 ,导致钻井液性能恶化 ,维护处理复杂 ,甚至引发钻井事故。针对此类地层 ,研制了抗盐、抗钙能力强的高密度有机盐钻井液。通过大量的试验 ,优选与有机盐相配伍的处理剂 ,优化处理剂加量 ,确定了有机盐钻井液配方为 :水 +0 .5 %Na2 CO3 +(3%～ 4 % )抗盐粘土 +(0 .15 %～ 0 .2 % )XC +(1.5 %～ 2 .5 % )降滤失剂 +(5 0 %～ 130 % )复合有机盐 +2 %无荧光防塌剂 +1.0 %聚合醇 +加重剂。并对该钻井液体系的流变性、抑制性、抗温性、抗盐、抗钙能力、固相容量等进行了评价。结果表明 ,该钻井液体系性能稳定 ,抑制性、抗污染能力强 ,固相容量限高。 2 0 0 3年该高密度有机盐钻井液在家 5 9井现场应用中 ,钻井液性能稳定 ,携砂能力强 ,维护处理简单 ,解决了盐膏层钻进中的钻井液技术难题 ,避免了复杂及事故的发生 ,安全顺利钻穿了该井沙二段 341m的复杂盐膏层。
Conventional drilling fluids are easily contaminated with salts, ointments and the like during the drilling of complex formations such as salt-gypsum layers, leading to deterioration of drilling fluid properties, complex maintenance and even drilling accidents. For such strata, developed salt and calcium-resistant high-density organic salt drilling fluid. Through a large number of experiments, preferably with the organic salt compatible treatment agent, optimizing the amount of treatment agent, to determine the organic salt drilling fluid formula is: water +0 .5% Na2 CO3 + (3% to 4%) salt-resistant clay + (0 .15% ~ 0 .2%) XC + (1.5% ~ 2 .5%) Fluid loss + (50% ~ 130%) Composite organic salts + 2% Alcohol + weighting agent. The rheology, inhibition, temperature resistance, salt resistance, calcium resistance, solid phase capacity and other properties of the drilling fluid system were also evaluated. The results show that the drilling fluid system is stable, inhibitory, anti-pollution ability, high solid phase capacity limit. In 2003, the high-density organic salt drilling fluid used in the field has good stability of drilling fluid, strong sand carrying capacity and simple maintenance and treatment, which solved the technical problem of drilling fluid in the drilling of salt-and-paste layer and avoided the problems Complex and accident occurred, safe and smooth drilling piercing the second section of sand 341m complex salt layer.