关键词: 页岩气；泡沫排水；评价方法；工艺流程；标准规范

Abstract: Drainage foam gas production process is an important integral part of drainage gas production measure and has been used on a large scale on the shale gas block in the Sichuan-Chongqing region. To further clarify the technological requirements on shale gas foam drainage, the methods for comparative analysis and experience analysis were adopted to compare and analyze the adaptability of the current standards and specifications on shale gas foam drainage technology. The study indicates that the current foam drainage process effectively specify the technological contents, such as inspection of foam drainage chemical agents, design of process plan and the related on-the-site process facilities. However, some problems exist among the current standards, such as overlapping, differences, contradiction and singularity of content. Therefore, it is possible to clarify complete execution of foam drainage process by means of any single standard. Focusing on the overall foam water drainage gas production process characteristics of the Sichuan-Chongqing shale gas platform well patterns, the NB/T 11045.3—2023 “Shale gas—Specification for drainage gas recovery technique—Part 3:Water drainage by foam” was formulated in 2023 to solve the differences and contradictions among the current standards and cover the main technological points in overall foam drainage process execution of the shale gas platform well pattern in shale gas development process. So far as the current standards and specifications are concerned, those standards still have something unsatisfactory. It is proposed to add the technical indexes of “storage stability” to functional evaluation of defoaming agents. It is also proposed to add secondary defoaming to the single-well foaming and concentrated defoaming process and the thrower injection technical process on the concentrated measurement platform of foam additional injection technical process, thus further perfecting the content of the foam drainage technological specifications.

Key words: shale gas; foam drainage; evaluation method; technical process; standards and specifications