南川常压页岩气田高效开发关键技术进展

doi:10.13809/j.cnki.cn32-1825/te.2021.03.011

摘要/Abstract

摘要：

针对南川页岩气田开发中存在的地质条件复杂、钻井漏失垮塌、压裂改造效果不理想、缺少有效人工举升等问题,通过对钻完井技术、压裂技术及采气技术进行深入研究,完成了开发工艺技术的优选、集成与改进,形成了常压页岩气高效钻完井技术、高效压裂技术和页岩气井排水采气技术等一体化开发技术。其中常压页岩气高效钻完井技术,主要包括井身结构优化、钻头与螺杆一体化提速工艺、极限参数钻井工艺、高效完井工艺;高效压裂技术主要包括一体化全电压裂工艺、一体化滑套完井压裂工艺、组合暂堵转向工艺等;适用的常压页岩气井排水采气技术主要包括单管射流泵和机抽排采两种工艺。通过上述技术推广应用,在南川区块形成了完整的针对不同区域、不同井深的常压页岩气田高效开发工艺技术系列,推进了常压页岩气田降本增效开发。

关键词: 常压页岩气, 南川地区, 一体化工艺技术, 钻完井, 电动压裂, 人工举升

Abstract:

In order to solve the problems existing in the development of Nanchuan Shale Gas Field, such as complex geological conditions, drilling leakage collapse, unsatisfactory fracturing effect and lack of effective artificial lifting, the optimization, integration and improvement of development technologies have been completed through in-depth research on drilling and completion technology, fracturing technology and gas production technology, and integration development technologies such as high-efficiency drilling and completion technology, high-efficiency fracturing technology and shale gas well drainage and gas production technology have been formed. Among them, the high-efficiency drilling and completion technology of normal-pressure shale gas mainly includes wellbore structure optimization, bit and screw integrated speed-up technology, limit parameter drilling technology and high-efficiency completion technology; high-efficiency fracturing technology mainly includes integrated all-electric pump fracturing technology, integrated sliding sleeve completion fracturing technology, combined temporary plugging steering technology, etc.; the applicable drainage and gas recovery technology of normal pressure shale gas well mainly includes two processes: single pipe jet pumping and mechanical pumping. Through the popularization and application of the above technologies, Nanchuan Block has formed a complete series of high-efficiency development technologies for normal-pressure shale gas fields in different areas and different well depths has been formed in Nanchuan Block, which has promoted the development of normal-pressure shale gas fields with reduced costs and increased efficiency.

Key words: normal-pressure shale gas, Nanchuan area, drilling and completion, integration technology, electric fracturing, artificial lifting

中图分类号:

TE25

张国荣,王俊方,张龙富,陈士奎. 南川常压页岩气田高效开发关键技术进展[J]. 油气藏评价与开发, 2021, 11(3): 365-376.

ZHANG Guorong,WANG Junfang,ZHANG Longfu,CHEN Shikui. Key technical progress in efficient development of Nanchuan normal-pressure shale gas field[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 365-376.

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排量范围（L/s）	额定压降（MPa）	额定扭矩（N·m）	最大推荐钻压（kg）	动力段配置
排量范围（L/s）	额定压降（MPa）	额定扭矩（N·m）	最大推荐钻压（kg）	级数	头数
37.9~75.7	10.69	55 101	57 600	4.8	7/8

钻头尺寸（mm）	钻压（t）	较常规提高（%）	排量（L/s）	较常规提高（%）
311.2	16~20	43	59~64	8
215.9	14~16	60	33~34	13

轨迹控制方式	平均机械钻速（m/h）	段长（m）	周期（d）	单价（万元/d）	测量零长（m）	复合钻进比例（%）	井眼光滑度
LWD+ 水力振荡器	9	1 500	12	5	16~20	70~90	中
近钻头+ 水力振荡器	8.3	1 500	14	7.8	1.0~1.5	40~60	中
旋转导向	10	1 500	11	12.5	2.0~3.5	100	高

序号	井号	平均日产气（m³）		平均日产水（m³）		日均增产（m³）	累计增产（m³）	备注
序号	井号	措施前	措施后	措施前	措施后	日均增产（m³）	累计增产（m³）	备注
1	PY3HF	1 000	4 974	1	14	3 974	2 006 870
2	PY4HF	8 489	11 078	9.28	14.4	2 589	59 547
3	PY5HF	4 402	5 490	9.2	55.4	1 088	68 544
4	SY3HF	0	13 575	0	76			产能下降,难以自喷生产后上射流泵复产
5	LY3HF		10 472		110			直接射流泵投产
6	PD1HF		8 600		38.1			直接射流泵投产
7	JY211-4HF	15 731	20 929	8.25	74.1	5 198	1 003 214
合计							3 138 175