| 摘要: |
| 随着苏里格气田水平井改造、体积压裂工艺、混合水压裂方式、工厂化作业等实现推广应用,返排液量剧增,尤其是新环保法实施后,不允许挖建防渗排污坑,环保形势异常严峻。急需研发返排液不落地回收处理技术,实现其重复再利用。针对返排液中含有大量天然气、压裂砂、悬浮物,压力高、分离处理难度大等难题,优化形成了压裂返排液在线连续处理技术,主要包括管线节流控制模块、高压除气模块、低压除气除砂模块、精细化过滤模块和浓残液蒸发模块,经过10 μm精细过滤,得到纯净的压裂返排液。进一步化学处理后,添加稠化剂等重新配液用于下次压裂施工,重复利用率达到90%以上,少量浓残液采用蒸发处理。现场先导性试验23井次,回收液体44 649 m3,取得了显著的社会、经济效益,为国内压裂返排液环保处理技术的创新发展提供了借鉴。 |
| 关键词: 苏里格气田 致密气藏 压裂返排液 不落地 回收 |
| DOI：10.3969/j.issn.1007-3426.2017.05.020 |
| 分类号:TE992 |
| 基金项目: |
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| Application of on-line recycling technology on fracturing flowback in Sulige gas field |
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Yang Boli
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CCDC Changqing Downhole Technology Company,Xi′an,Shaanxi,China
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| Abstract: |
| With the in-depth exploration and development, horizontal well technology, volume fracturing technology, mixing water fracturing, and factory fracturing have been large-scale popularized and applied in Sulige gas field. These fracturing technologies use large amounts of sand and fracturing fluid, resulting in dramatic increase of fracturing flowback fluid. In particular, after the implementation of the new environmental laws, conventional sewage impermeable pits are prohibited. It is urgent to study and develop the non-landing flowback processing technology to achieve fast and efficient recycling. This article introduced the fracturing flowback recycling technology applied in Sulige gas field. Considering fracturing flowback fluid that often contains natural gas, fracturing sand and other solid particles, and known for elevated pressure and difficult to separate, on-line continuous processing technology on fracturing flowback fluid was optimized, which was composed of pipeline buck control module, high-pressure degassing module, low pressure degassing and desanding module, and fine filter module. These modules were filtered through the finest 10 μm filter to obtain the pure fracturing flowback fluid. After further chemical treatment, thickener was added for the next fracturing operation. The reusing ratio of flowback fluid could attain more than 90%, leaving the residual concentrate for evaporation process. The pilot field tests were carried out for 23 times and 44 649 cubic meters of flowback fluid was recovered, showing remarkable social and economic benefits. This technique provided a reference for the domestic innovation of fracturing flowback recycling technology innovation. |
| Key words: Sulige gas field tight gas reservoir fracturing flowback fluid non-landing processing recycling |
