一种低伤害海水基压裂液体系  

Study on Low Damage Seawater Base Fracturing Fluids

作　　者：刘通义[1,2] 于毅[1] 赵众从[1] 林波 陈江明[1] 兰昌文 

机构地区：[1]西南石油大学化学化工学院 [2]成都佰椿石油科技有限公司

出　　处：《钻井液与完井液》2015年第6期68-71,108,共4页Drilling Fluid & Completion Fluid

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4 000和2 000 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0.032 4 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 m N/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。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 Ca^(2+) and 2,000 mg/L Mg^(2+).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.

关 键 词：海水基压裂液 稠化剂 耐温 耐盐 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]