渝东南常压页岩气压裂关键技术研究与应用

doi:10.13809/j.cnki.cn32-1825/te.2020.05.010

摘要/Abstract

摘要：

为了解决渝东南常压页岩气储层因水平应力差大和高角度裂缝发育等地质特点难以形成复杂缝网体系,进而难以实现经济开发这一问题,开展了常压页岩气藏压裂关键技术应用研究。通过对彭水区块常压页岩气水平井压裂技术分析,借鉴国外海相页岩气压裂成功经验的基础上,不断探索,对压裂改造规模、连续加砂工艺和段内暂堵转向优化等关键技术不断优化,从而提高裂缝的复杂程度,增大单段改造体积形成大型复杂缝网。在LY2HF井和JY10HF井的现场应用分别取得了日产气9.6×10⁴ m³ 和16.7×10⁴ m³的良好效果,从而实现常压页岩气的经济开发。

关键词: 常压页岩气藏, 复杂缝网体系, 压裂改造规模, 连续加砂, 段内暂堵转向

Abstract:

The normal pressure shale gas reservoir in Southeastern Chongqing is characterized by large horizontal stress difference and high angle fracture development, so that it is difficult to form the complex fracture network and further realize the economic development. In order to solve these problems, key technologies of fracturing in normal pressure shale gas reservoir is studied. Based on the analysis of the fracturing technology of normal pressure shale gas horizontal wells in the Pengshui block, and by drawing on the successful experience of foreign marine shale gas fracturing, the scale of fracturing transformation, continuous sanding process and interim period have been continuously explored and optimized to improve the complexity of fractures and increase the volume of single section reconstruction to form a large-scale complex fracture network. Good results have been achieved in the current application in well-LY2HF and well-JY10HF of daily gas production of 9.6×10⁴ m³ and 16.7×10⁴ m³ respectively, thus realizing the economic development of normal pressure shale gas.

Key words: normal pressure shale gas reservoir, complex seam net system, fracturing transformation scale, continuous sanding, temporary block steering

中图分类号:

TE357

岑涛,夏海帮,雷林. 渝东南常压页岩气压裂关键技术研究与应用[J]. 油气藏评价与开发, 2020, 10(5): 70-76.

CEN Tao,XIA Haibang,LEI Lin. Research and application of key technologies for fracturing of normal pressure shale in Southeastern Chongqing[J]. Reservoir Evaluation and Development, 2020, 10(5): 70-76.

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液量/ m³	砂量/ m³	波及半缝长/ m	支撑半缝长/ m	缝高/ m	波及宽度/ m
1 400	50	240	200	54	60
1 600	60	245	220	59	64
1 800	70	286	240	61	75
2 000	80	310	265	65	80

直径/ mm	抗压强度（130 ℃）/ MPa	开始溶解时间/ h	完全溶解时间/ d
5.5	30	15	3~5
5.5	40
9.0	50
11.0	60
13.0	60

井名	施工周期	压裂段长/m	压裂段数	平均段长/m	平均段间距/m	总液量/ m³	总砂量/ m³	平均单段液量/m³	平均单段砂量/m³	排量/ （m³·min^-1）	最高日产气量/ m³	主要特征
PY2HF井	20150104 —20150115	905	9	101	100.0	20 896	620	2 322	69	14~16	12 000	中等规模大段间距
PY1HF井	20120501 —20120508	1 020	12	85	85.0	16 212	823	1 351	69	8~10	25 000	小规模中等段间距
PY4HF井	20140102 —20140108	1 400	12	117	117.0	21 388	814	1 782	68	12~14	27 000	中等规模大段间距
PY3HF井	20130106 —20130125	1 280	22	58	58.0	46 542	2 108	2 115	96	10~14	38 000	大规模小段间距
LY1HF井	20151115 —20151126	1 328	17	78	37.0	34 133	1 192	2 008	70	14~16	62 000	中等规模中等段间距
LY2HF井	20171122 —20171208	1 700	20	85	34.9	45 719	2 576	2 286	129	14~18	96 000	大规模小段间距
JY10井	20180318 —20180401	1 542	21	73	33.3	45 941	2 032	2 188	97	16~18	167 100	大规模小段间距

裂缝类型	裂缝占比/%		G函数曲线特征
裂缝类型	LY2HF井	JY10HF井	G函数曲线特征
主缝+分支缝	9.7	10	近似一条直线,斜率为常数
复杂裂缝	40.1	42	逐步上升后在高位,发生多次微小波动
剪切网缝	50.2	48	快速上升后在高位,发生多次较大波动,斜率不断变化