深层页岩气套损井全通径无级滑套水平井分段压裂投产技术——以WY9-2HF井为例

doi:10.13809/j.cnki.cn32-1825/te.2021.02.011

摘要/Abstract

摘要：

页岩气尤其是深层页岩气水平井套损一直是困扰页岩气分段压裂开发的难题,常规的套管补贴、化学封堵等方法无法同时满足页岩气高压裂压力、大排量施工和小桥塞通过,导致页岩气常规泵送桥塞分段工艺难以实施;而采用常规多封隔器分段工艺,由于投球滑套极差限制,分段数、排量受限,难以满足页岩气压裂排量、规模等要求。针对深层页岩气井WY9-2HF套损问题,通过风险论证、管柱力学分析及结构优化、工具研发与改进、井筒模拟试验等研究,采用悬挂封隔器管柱隔离套管破损井段,通过上部套管注入结合下部油管注入方式以提高排量;采用全通径无级滑套,增加分段级数同时提高施工排量,配套多封隔器下入工艺、套损井井控安全措施、大排量分段压裂工艺,在WY9-2HF页岩气井实现大排量、大规模31级分段压裂,达到预期压裂目标,获投产日产气8.75×10⁴ m³/d,该技术对类似页岩气套损井分段压裂投产具有借鉴意义。

关键词: 页岩气, 套损, 全通径, 无级滑套, 悬挂封隔器

Abstract:

The casing damage of horizontal wells for shale gas, especially for deep shale gas, has always been a problem that troubles the staged fracturing development of shale gas. The conventional methods, such as casing patching and chemical plugging, cannot simultaneously meet the demands of high pressure, high flow rate and small bridge plug passing during fracturing, resulting in the difficult implementation of the staged fracturing technology through pumping of bridge plugs. Besides, the staged fracturing technology with multi-packer is difficult to meet the requirements of pumping rate and scale due to the limited number of segments and limited displacement, resulting from the limited range of the ball-drop sliding sleeve. Taking Well-WY9-2HF as an example, by conducting the researches such as risk demonstration, pipe string mechanical analysis and structural optimization, tool development and improvement, and wellbore simulation test, the following conclusions are drawn: the string with suspension packer is suitable for isolating the casing-damaged sections; the combination of the upper casing and the lower tubing for injection can raise the pump rate; the full bore infinite sliding sleeve can increase the number of segments and the pump rate; together with multi-packer, well control safety measures and high-rate segmented fracturing technique, the full bore infinite sliding sleeve is used to realize a large-scale and high-rate fracturing with 31 stages in Well-WY9-2HF, which achieves the expected targets and obtains a commissioning production of 8.75×10⁴ m³/d. This technology can be used as a reference for the fracturing and commissioning of such wells.

Key words: shale gas, casing damage, full bore, infinite sliding sleeve, suspension packer

中图分类号:

TE357

龙刚,薛丽娜,杨晓莉. 深层页岩气套损井全通径无级滑套水平井分段压裂投产技术——以WY9-2HF井为例[J]. 油气藏评价与开发, 2021, 11(2): 219-222.

Gang LONG,Lina XUE,Xiaoli YANG. Staged fracturing technology with full bore infinite sliding sleeve of casing-damaged horizontal wells for deep shale gas: A case study of Well-WY9-2HF[J]. Reservoir Evaluation and Development, 2021, 11(2): 219-222.

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工艺对比		排量（m³/min）	液量（m³）	砂量（m³）
泵送桥塞单簇	设计	4 ~ 5.3	1 133.3 ~ 1 246.7	19.4~22.87
封隔器分段单段	实际	4 ~ 6.0	927.8 ~ 1 558.3	36.1~83.50