中低温水井清洁型凝胶压裂液设计与研究

Design and research of clean gel fracturing fluid for medium and low temperature wells

摘要:

基岩水井压裂增水技术自研发以来取得较为良好的增产效果，但该技术目前仍存在适用性差、增产效果不确定等问题。基于压裂增水过程中流体流态和裂缝宽度影响因素分析的结果，确定了提高压裂液粘度是较为经济、有效的增产技术措施。开展了水井和中低温地热井清洁型凝胶压裂液配方的设计工作，进行了稠化剂、pH值调节剂、交联剂和破胶剂选配与性能实验，研发了适用于水井和中低温地热井（30~80 ℃）清洁型凝胶压裂液体系并开展现场试验。对凝胶压裂液配液应用难点与使用成本进行了分析，进一步补充完善了水井压裂增水技术在压裂液方向的研究。

Abstract:

Since bedrock water well fracturing technology was developed， it has achieved good stimulation effect， but there are still some problems such as poor adaptability and uncertainty in stimulation performance. Based on the analysis results of the factors influencing the fluid flow pattern and the fracture width in fracturing stimulation， it is determined that increasing the viscosity of fracturing fluid is a more economic and effective stimulation technical measure. The design of clean gel fracturing fluid formulations for water wells and middle and low temperature geothermal wells has been carried out； and the thickener， pH regulator， crosslinking agent and gel breaker have been selected and tested. A clean gel fracturing fluid system suitable for water wells and medium and low temperature geothermal wells （30 to 80℃） has been developed and field tested. Analysis is conducted of the application difficulties and cost of gel fracturing fluid， which supplements the research on fracturing technology for water well fracturing stimulation.