Study on Low Damage Seawater Base Fracturing Fluids
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摘要: 为了降低海上油田压裂施工成本,研究海水基压裂液并实现连续混配是一条重要的途径。研究合成了一种适应直接用海水配制的耐盐稠化剂BCG-1S,其抗Ca2+、Mg2+离子能力分别达到4000和2000 mg/L。在10℃下0.55% BCG-1S能在10 min内起黏,复配0.3%增黏剂B-55后,4 min内压裂液的性能就达到海洋平台海水连续混配的要求,并具有较好的携砂性能,30℃下单颗粒的沉降速率为0.0324 mm/s。评价表明,该压裂液的静态携砂性、稳定性能良好、抗温能力达到140℃;破胶彻底,残渣含量小于5 mg/L,破胶液表面张力小于26 mN/m,破胶液对支撑裂缝导流能力的伤害低至8.45%。该稠化剂具有良好的应用前景。Abstract: A salt-resistant thickening agent, BCG-1S, was developed for use inseawater base fracturing fluids.The BCG-1S is made from acrylamide, unsaturated functional monomers DM16 and AMP1 through polymerization and hydrolysis, using ammonium persulfate-sodium bisulfite as initiator.Below 10℃ 0.55%BCG-1S viscosities in 10 min.Settlent rate of single particle is 0.0324mm/s at 30℃.The viscosified tap water or seawater can tolerate contamination of 4, 000 mg/L Ca2+ and 2, 000 mg/L Mg2+.A seawater base fracturing fluid is formulated with the BCG-1S, BCG-5(a metallic ion chelator), B-55(a viscosifier), B-13(a high temperature stabilizer) and BCG-10(an encapsulated gel breaker) etc.This fracturing fluid has good carrying capacity and high temperature stability(up to 140℃).No sedimentation of solid particles is found in the fracturing fluid sample at 25℃ after 7 d, and the viscosity of the fluid remains almost unchanged.The fracturingfluid, after gel breaking, has residue content of less than 5 mg/L and surface tension of less than 26 mN/m, indicating thorough gel breaking.The flow conductivity of the fractures generated by this fracturing fluid is only reduced by 8.45%by the gel breaker solution used, which is acceptable.
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