温度响应地下自生成支撑剂研究

为了在超深储层中构建全缝长、全缝网的有效支撑，研制了一种由相变液体和非相变液体组成的温度响应地下自生成支撑剂（液体支撑剂）。该支撑剂在地面低温条件下呈液态，在储层高温条件下发生相变，经过一定时间可转变为固体颗粒，从而支撑裂缝，并在高温和高闭合压力下始终保持较高的裂缝导流能力。室内性能试验表明，该支撑剂在不同搅拌速度下可以形成不同粒径的固体颗粒；相变前的液体支撑剂是一种黏性流体，滤失量低、配伍性良好；相变后形成的地下自生成支撑剂具有较好的承压能力，且粒径大小可控、相变时间可调，60 MPa闭合压力下不同粒径组合的有效导流能力可达9.21 D·cm。温度响应地下自生成支撑剂的研制，为超深储层的油气高效开发提供了一种新的改造方式。 

Research of Temperature-Responsive Subsurface Self-Generated Proppant

A liquid proppant comprised of a phase-change liquid and a non-phase-change liquid was developed to effectively support the full fracture length and network in ultra-deep reservoirs. The developed proppant is liquid under the ground temperature, while it undergoes phase change under the high temperature in reservoirs and transforms into solid particles after a while to support fractures. In addition, it could maintain high fracture conductivity under high temperature and high closing pressures. The test results revealed that the liquid proppant could transform into solid particles of different sizes under different mixing speeds. Before the phase change, it was a viscous fluid, with low filtration loss and good compatibility. After the phase change, the subsurface self-generated proppant had a good pressure-bearing capacity, and the particle size and phase change time could be controlled. Under the closing pressure of 60 MPa, the combinations of proppants of different particle sizes could have an effective conductivity of 9.21 D·cm. The development of the temperature-responsive subsurface self-generated proppant can provide a new efficient stimulation method for oil and gas development in ultra-deep reservoirs.