页岩气全生命周期气举排水采气技术研究与应用

doi:10.3969/j.issn.1002-302x.2022.02.006

摘要/Abstract

摘要： 页岩气等非常规气藏是我国“十四五”天然气上产的重要领域，其主体开发工艺是“水平井+体积压裂”。在排采技术中，气举由于不受井斜、井深等限制，在水平井中应用优势突出。基于此，研究提出了贯穿整个排采期的全生命周期气举排水采气技术。该技术以多级气举阀为核心，通过改进设计方法和完井工具，实现连续气举与柱塞气举、泡沫排水采气、负压回注排水采气、喷射气举等技术的集成，并配套智能化管理平台，形成气举复合排水采气技术，可利用一趟完井管柱将气井开采至废弃。建立贯穿全生命周期的技术策略，满足了页岩气藏不同生产阶段排水采气技术需求，减少了排采方式变更带来的修井作业量，达到降低技术成本、减少储层伤害的目的，预计可提高采收率3%~6%，页岩气井开采成本大幅降低。

关键词: 页岩气, 全生命周期, 气举排水采气, 一趟完井管柱

Abstract: The unconventional gas reservoir like shale gas is an important area for China’s natural gas production in the 14th Five-year Plan period. The main development process is “horizontal well + volumetric fracturing”. As for drainage and production technologies, gas lift is used for horizontal well because it is free from limitations of well deviation and well depth. Therefore, this paper put forward the gas lift drainage and production technology that runs through the full life cycle of the drainage and production period. This technology is concentrated on the multi-stage gas lift valve. Based on improvement of the design method and completion tools, continuous gas lift is integrated with intermittent gas lift, foam discharge, negative-suction gas recovery and jet gas lift. Equipped with the intelligent management platform, it is the gas lift compound drainage and production technology that can use one-trip completion string to keep the gas well producing until it is abandoned. The technological plan for full life cycle satisfies the demand for drainage and production technology of shale gas reservoirs at the different production stages, reduce workover services caused by change of the drainage and production method, lower the technological cost and reduce damage of reservoirs. The productivity is estimated to improve by 3 precent to 6 percent, substantially reducing the production cost of a shale gas well.

中图分类号:

TE377

方志刚　王振松　马斌　王伟　齐韦林　李南星. 页岩气全生命周期气举排水采气技术研究与应用[J]. 石油科技论坛, 2022, 41(2): 45-52.

Fang Zhigang, Wang Zhensong, Ma Bin, Wang Wei, Qi Weilin, Li Nanxing. Research and Application of Life-cycle Gas-lift Drainage and Production Technology for Shale Gas[J]. Petroleum Science and Technology Forum, 2022, 41(2): 45-52.

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