威荣深层页岩长水平段工程钻探能力延伸极限研究

doi:10.13809/j.cnki.cn32-1825/te.2022.03.013

Abstract

Abstract:

The vertical depth of Weirong deep shale gas reaches 3 800 m, and the formation collapse pressure coefficient is above 1.95. The ultra-long horizontal wells in the region are increasing year by year, and the ultra-long horizontal wells have become an important development means for stable production in the later stage of the gas field. Based on the research of rotary steerable drilling method, the hydraulic open-hole evaluation model and Landmark software are used to comprehensively analyze the influencing factors of geological parameters, trajectory profile, drill string mechanics, hydraulic parameters and surface equipment. The extension limits of the ultra-long horizontal section were different under different rig conditions and working conditions. The optimized profile type is beneficial to prevent collision between wells and safe running of pipe string. The stress intensity of the drill string in 3D trajectory profile is twice that of 2D trajectory profile, and both the density and viscosity of drilling fluid will affect the extension of ultra-long horizontal section. The evaluation results show that the theoretical limit of open hole horizontal section is 5 840 m without considering the drilling capacity, while the maximum horizontal section extension of 70 drilling rig is 3 500 m due to the drilling depth limit. The larger the pump displacement, the lower the drilling fluid density, and the longer the elongation capacity.

Key words: Weirong, deep shale gas, ultra-long horizontal section, extension limit, rotary steering drilling

CLC Number:

TE242

Huashu ZHU,Xiyong WANG,Xiaoling XU, et al. Extendability limit of engineering drilling in long horizontal section of Weirong deep shale gas[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(3): 506-514.

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References 21

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地层	地压梯度（MPa/hm）	破压梯度（MPa/hm）
遂宁组—新田沟组	1.00~1.10	1.8左右
自流井组—须家河组	1.10~1.30	大于1.8
雷口坡组—飞仙关组	1.30~1.50	大于2.0
长兴组—龙潭组	1.40~1.50	大于2.0
茅口组—石牛栏组	1.40~1.60	大于2.3
龙马溪组—五峰组	1.60~1.90	2.2~3.2

剖面类型	斜井段长（m）	井下摩阻（kN）
二维剖面	400~450	200~250
双二维剖面	630~750	260~280
三维剖面	1 600~1 850	300~330

井眼曲率 [（°）/hm]	最短靶前距（m）	井眼曲率 [（°）/hm]	最短靶前距（m）
16	358	21	272
17	337	22	260
18	318	23	249
19	302	24	239
20	286

类型	常规取值		威荣地区
类型	油基	水基	油基	水基
套管	0.23	0.29	0.24	0.32
裸眼	0.32	0.37	0.35	0.41

井号	塑性黏度（mPa·s）	摩阻（kN）	井号	塑性黏度（mPa·s）	摩阻（kN）
WY26-6	68~70	100	WY31-2	71~80	150
WY26-1	60~70	80	WY31-7	75~85	180
WY23-8	60~77	180	WY34-1	80~95	230
WY35-2	65~77	150	WY29-8	75~95	250

Extendability limit of engineering drilling in long horizontal section of Weirong deep shale gas

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井眼直径（mm）	钻具直径（mm）	柱数（柱）	共计（柱）	剩余空间（柱）
215.9	139.7	43	254	-4（4柱不能摆放）
215.9	127.0	211	254	-4（4柱不能摆放）
165.1	139.7	36	270	0
	127.0	95
	101.6	139

井眼直径（mm）	直井段段长（m）	斜井段段长（m）	70钻机最大钻深（m）	裸眼水力延伸极限（m）	受钻机限制水平段长（m）	不考虑钻机限制总井深（m）
215.9	3 400	400	7 300	5 840	3 500	9 640
165.1	3 400	400	7 500	5 840	3 700	9 840

钻机类型	最大起重量（kN）	绞车功率（hp）	泵组功率（hp）
70钻机	4 500	2 000	1 600
7 500 m所需升级钻机	3 664	2 137	2 567

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