Study on Filter Loss Reducer for High Density Clay-free Saturated Saltwater Drilling Fluids
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摘要: 针对当前石膏层、盐膏层和高压盐水层所用高密度饱和盐水钻井液土相堵塞、污染油气储层，高温导致黏度失控和大量磺化材料的使用使体系呈强凝胶状态，流变性优控不能解决的问题，通过合成改性淀粉和合成聚合物研制了具有"互穿聚合物网络"的无土相高密度饱和盐水钻井液用降滤失剂BH-HSF。BH-HSF抗温可达150℃，抗Ca、Mg可达4000 mg/L，在高密度无土相饱和盐水钻井液中，API滤失量低于4.0 mL，对加重材料悬浮能力强，静置后无硬沉，并可优化体系流变性，克服现用钻井液流变性优控不能解决的缺点。BH-HSF与同类国际先进产品HT-Starch性能相当，且与其他钻井液处理剂配伍性良好。Abstract: Clays used in high density saturated drilling fluids for drilling gypsum, salt formations and formations with high-pressure brines have some drawbacks, such as formation damage by the invasion of clay particles, and progressive gelling of the drilling fluids caused by uncontrollable viscosity uprising at elevated temperatures and overuse of sulfonates. Progressive gelling of drilling fluids with clays usually cannot be controlled by rheological optimization. To resolve this problem, a filter loss reducer, BH-HSF, for high density clay-free saturated drilling fluids has recently been developed through synthesis of modified starch and other polymers. BH-HSF is able to develop an "interpenetrating polymer network" in water solution, and performs well at 150℃ and Ca2+/Mg2+ concentration of 4,000 mg/L. High density clay-free saturated saltwater drilling fluids treated with BH-HSF have API filtration rate of less than 4.0 mL. They have good capacity for suspending weighting materials, and no weighting materials settlement has ever occurred after long period of standing. Deterioration of the rheology of BH-HSF treated drilling fluids can be controlled by rheological optimization. BHHSF has properties that are equivalent to HT-Starch (a well-known drilling starch with advanced performance) and is well compatible with other drilling fluid additives.
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