Abstract: An associative seawater⁃based fracturing fluids with temperature resistance of 180 ℃ was formed by thermostable and salt⁃resistant thickening agent containing hydrophobic groups, physical crosslinking agent with ionic surfactant, high temperature stabilizer and high efficiency chelating agent. The fracturing fluid forms a high⁃strength network structure through the physical association between the hydrophobic groups on the molecular chain of thickener and cross⁃linker, which enhances its viscoelasticity and takes elasticity as the dominant factor. The viscosity of the fracturing fluid can be maintained above 30 mPa•s for 90 minutes at 180 ℃ and 170 s-1, which has good static sand⁃carrying and wall⁃building properties. The viscosity of gel breaking fluid is 3.3 mPa•s, the residual content is 45 mg/L, and the damage rate of core permeability is less than 10%. The seawater⁃based fracturing fluid meets the requirements of fracturing for offshore ultra⁃high temperature deep reservoirs.

Key words: Ultra?high temperature, Associative, Seawater based fracturing fluid, Viscoelastic, Proppant carrying capacity； Low damage

摘要： 以含有疏水基团的耐温抗盐稠化剂为主剂，以离子型表面活性剂为交联剂，加入复配高温稳定剂和高效螯合剂，形成一套耐温180 ℃的缔合型超高温海水基压裂液。该压裂液通过稠化剂和交联剂分子链上的疏水基团间的物理缔合作用形成高强度的网络结构，增强其黏弹性，并以弹性为主导；在180 ℃、170 s-1下剪切90 min黏度保持30 mPa•s以上，具有良好的静态悬砂性和造壁性；破胶液黏度3.3 mPa•s，残渣质量浓度45 mg/L，岩心渗透率损害率小于10%。该海水基压裂液满足海上超高温深部储层压裂施工的要求。

关键词: 超高温, 缔合, 海水基压裂液, 黏弹性, 携砂性, 低伤害