摘要
为了应对新的环境保护形势，保护环境和水资源，解决压裂返排液难处理的问题，2013--2015年长庆油田开展了可回收压裂液研发与现场试验。研发了满足不同井深、不同温度储层改造需求的可回收重复利用的生物清洁压裂液体系、EM50聚合物压裂液体系和RP120低聚物压裂液体系，3种压裂液具有低伤害、高携砂、易返排、易回收处理、成本低的特点，实现了压裂液连续混配、返排液多次回收重复利用和压裂“清洁化”生产作业模式。2014—2017年在苏里格气田规模试验600多口井，生物清洁压裂液首次实现了回收复配液在气井的高砂比、全过程施工，首次实现了回收液再利用率100％。探索形成了返排液回收处理简易工艺流程，实现了返排液不落地处理，回收再利用，降低了废液处理成本，具有良好的推广应用前景。试验井累计回收再利用返排液32800m^3，回收液重复利用率迭75％以上，大大降低了压裂液配液及压裂返排液处理成本，实现了单井增产约2×104m^3／d，实现了经济效益大幅提高。
In order to cope with the new environmental protection situation, protect the environment and water resources, and solve the problem that the fracturing and drainage of liquids is difficult to handle, during 2013-2015 Changqing Oilfield Company carried out research and development and field tests of recyclable fracturing fluids. A renewable biologically-clean fracturing fluid system, an EM50 polymer fracturing fluid system, and an RP120 oligomer fracturing fluid system were developed to meet the needs of reservoir stimulation at different well depths and temperatures. The three types of fracturing fluids have the characteristics of low damage, high sand-carrying capacity, easy flowback, easy recycling, and low cost, enabling the continuous mixing and preparation of fracturing fluids, multiple recycling and reuse of returning fluids, and the ＂cleaning＂ operation pattern of fracturing. From 2014 to 2017, large-scale experiments were performed on more than 600 wells in the Sulige Gasfield. The bio-cleaning fracturing fluid realized for the first time the high sand-proportion and the whole process of the recycling and repetitive dosing in the gas wells, and achieved first-time the 100% reutilization of the recovered liquid. A simple process of backflow liquid recycling treatment is formed through probing. The not-fall-to-the-ground treatment of the backflow liquid is achieved for recycling and reuse. This reduces the waste liquid treatment costs, and has good promotion and application prospects. The cumulative recycling of baekflow liquid of experimental wells was 32,800m^3, and the reutilization rate of recycled fluids was more than 75%. The costs fracturing fluid preparation and fracturing backflow fluid treatment were greatly reduced. An individual well production was increased by approximately 2×10^4 m^3/d. The economic benefits have been greatly improved.
作者
牟春国
邝聃
衣德强
何平
MOU ChunGuo;KUANG Dan;Yi DeQiang;HE Ping(Petroleum Technology Research Institute of PetroChina Changqing Oilfield Company;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil/Gas Fields)
关键词
苏里格气田
可回收压裂液
重复利用
低成本
环保
Sulige Gasfield
recyclable fracturing fluid
reutilization
low cost
environment protection
