多价金属离子对有机硼胍胶压裂液的影响及对策

针对新疆油田环玛湖地区浅层地下水、稠油热采水、压裂返排液中存在多价金属离子（Ca²⁺、Mg²⁺、Fe³⁺、Fe²⁺），影响其配制的胍胶压裂液性能。通过模拟不同种类和浓度多价金属离子水溶液，分析多价金属离子对有机硼胍胶压裂液溶胀、交联及耐温耐剪切性能的影响规律，研究了NSA、EDTA、CA，3种络合剂对多价金属离子的屏蔽效果。研究表明，多价金属离子对有机硼胍胶压裂液影响程度依次为Fe²⁺ > Fe³⁺ > Mg²⁺ > Ca²⁺；3种络合剂对Mg²⁺屏蔽能力为CA>NSA>EDTA，对Ca²⁺屏蔽能力为NSA > EDTA > CA，对Fe³⁺屏蔽能力为EDTA > NSA。为不同水质配制有机硼胍胶压裂液选择络合剂提供了依据。

Influence of Multivalent Metal Ions on Organic Borate-crosslinked Guanidine Gum Fracturing Gluids: Analysis and Countermeasures

In this study, we investigate the influence of multivalent metal ions (such as Ca²⁺, Mg²⁺, Fe³⁺, and Fe²⁺) present in shallow groundwater, heavy oil thermal recovery-produced water, and fracturing flowback fluids in the periphery of the Mahu oilfield in Xinjiang, on the performance of organic borate-crosslinked guanidine gum fracturing fluids. Through the simulations of aqueous solutions containing different types and concentrations of multivalent metal ions, the influence patterns of multivalent metal ions on the swelling, crosslinking, thermal resistance, and shear resistance properties of organic boratecrosslinked guanidine gum fracturing fluids were analyzed. Furthermore, the shielding effects of three complexing agents (NSA, EDTA, and CA) toward various multivalent metal ions were investigated. The results indicated that the order of influence of the various multivalent metal ions on organic borate-crosslinked guanidine gum fracturing fluids is Fe²⁺ > Fe³⁺ > Mg²⁺ > Ca²⁺, and the order of shielding ability of the three complexing agents toward Mg²⁺, Ca²⁺, and Fe³⁺ are CA > NSA > EDTA, NSA > EDTA > CA, and EDTA>NSA, respectively.