苏里格气田小井眼套管开窗侧钻水平井钻完井技术

doi:10.13809/j.cnki.cn32-1825/te.2021.01.018

Abstract

Abstract:

Sidetracking horizontal wells can be used to control reserves, digging potentials and longitudinal residual oil and gas reservoirs. The researches at home and broad show that both restart production of long-time shutdown wells and increasing oil and gas production in low production wells need to imply sidetracking horizontal wells. The Sulige Gas Field, located in the Ordos Basin, is a giant gas field with reserves exceeded trillion, and in there an annual production capacity of 249×10⁸ m³ has been built. However, its single well yield is low, the rate of decline is fast, and the number of wells with daily production less than 3 000 m³ accounts for 50 %. To explore side drilling horizontal wells and to improve gas recovery are the technical directions to achieve the steady production, cost reduction and efficiency increase in development of Sulige Gas Field. In view of the difficulties of sidetracking horizontal wells with small holes in the research block, the researches are carried out on safe drilling, completion technology and economic benefit. Twelve sidetracking horizontal wells are tested in site, with an average horizontal segment length of 672 m and an average drilling cycle of 49 d. The initial average daily gas production of a single well after sidetracking was 2.7×10⁴ m³. The practice shows that it is technically feasible for the casing sidetracking horizontal well to improve gas recovery of low production and low efficiency wells in Sulige Gas Field.

Key words: Sulige Gas Field, enhanced oil recovery, $\phi$ 139.7 mm casing, sidetracking horizontal well, $\phi$ 88.9 mm non-standard drill pipe

CLC Number:

TE243

Yong Ouyang,Hanbin Liu,Mingna Bai, et al. Drilling and completion of sidetracking horizontal well with small hole casing in Sulige Gas Field[J]. Reservoir Evaluation and Development, 2021, 11(1): 129-134.

Figures/Tables 10

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References 17

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钻杆类型	节箍外径（mm）	管体外径（mm）	管体内径（mm）	节箍部分内径（mm）	加厚	抗拉强度（kN）	抗挤强度（MPa）	抗扭强度（kN/m）
$\phi$ 89 mm特制钻杆	102.0	88.9	70.2	58.0	IU	2 336	176.5	15.0
$\phi$ 88.9 mm非标准钻杆	104.8~127.0	88.9	66.1	57.2或49.2	EU、IU、IEU	944~2 175	74.9~175.1	19.5~35.1
$\phi$ 73 mm标准钻杆	104.8	73.0	50.0	47.0	EU、IU	741~1 334	83.7~193.6	15.7~28.2

井底井斜（°）	井眼曲率[（°）/hm]
10~20	0~3
20~40	-1~15
40~60	-1~18
60~90	9~24

样品号	层组	K_g1储层岩石气测渗透率（10^-3 μm²）	K_g2储层岩石气测渗透率（10^-3 μm²）	伤害率（%）
11	H8	0.41	0.38	5.8
61	H7	0.10	0.09	4.9
9	H8	0.12	0.11	6.7
13	H7	0.17	0.16	5.0

名称	主要技术	技术指标
装备、工具	ZJ40、PDC钻头、MWD、$\phi$ 88.9 mm非标准钻杆	钻速从2.0 m/h上升至3.9 m/h,钻井周期从100 d缩短至33 d
开窗工艺	一体式开窗工具	磨铣进尺提高79.6 %,最短开窗仅用8 h
钻井液	聚胺基防塌钻井液体系	井壁稳定,实钻摩阻降低30 %以上
压裂工艺	小直径裸眼封隔器分段压裂	实现88.9 mm裸眼6段12簇压裂;最高投产产量7.1×10⁴ m³/d

Drilling and completion of sidetracking horizontal well with small hole casing in Sulige Gas Field

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