东海低渗透储层水平井分段压裂实施及效果评价

doi:10.13809/j.cnki.cn32-1825/te.2023.05.017

Abstract

Abstract:

Staged fracturing technology for offshore horizontal wells is still in an exploratory phase due to operational limitations. The effectiveness of fracturing horizontal wells has a significant impact on their productivity. Therefore, evaluating the fracturing effect and guiding the fracturing development of horizontal wells is a pressing concern. This paper firstly introduced the geological situation of low permeability reservoir in the East China Sea in detail, and the process of stage fracturing of the first open hole horizontal well was described. Then the fracturing effect of the multi-stage fractured horizontal well was evaluated successfully using the latest fracturing effect evaluation method of SPEE（Society of Petroleum Evaluation Engineers）. By analyzing the fracturing operation parameters of the well and comparing EUR（Estimated Ultimate Recovery） before and after fracturing, the fracturing effect evaluation method is verified to prove the correctness and reliability. Finally, it is concluded that the gas recovery rate of this horizontal well after fracturing is increased by 9.3 % and the oil recovery rate is increased by 6.6 %. The successful implementation of staged fracturing and the subsequent evaluation of its effects on the first horizontal well in the East China Sea set the stage for future development of horizontal well staged fracturing in offshore low-permeability reservoirs.

Key words: offshore, low permeability reservoir, staged fracturing, horizontal wells, fracturing effect evaluation

CLC Number:

TE348

ZHANG Fengxi, NIU Congcong, ZHANG Yichi. Evaluation of multi-stage fracturing a horizontal well of low permeability reservoirs in East China Sea[J].Petroleum Reservoir Evaluation and Development, 2023, 13(5): 695-702.

Figures/Tables 17

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Table 1

Table 2

$A_{c}\sqrt{k_{m}}$ summary of Well-XS"

参数	压裂模拟软件TP-FracSim						TP-FracEva	误差/%
参数	第1段	第2段	第3段	第4段	均值	4段$A_{c}\sqrt{k_{m}}$	4段$A_{c}\sqrt{k_{m}}$	误差/%
裂缝半长/m	75.00	103.00	72.60	118.00	92.15
$A c k m / m 2 10 - 3 ? μ m 2$	21 904	26 285	10 677	20 113	19 744	78 979	73 825	6.5

Table 2

Fig. 10

Fig. 11

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Table 3

Table 4

References 19

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参数名称	解释结果
参数名称	第1段（趾端）	第2段	第3段	第4段
裂缝闭合应力/MPa	57.50	58.40	62.00	59.60
平方根曲线净压力估算/MPa	2.68	6.44	3.95	6.40
G-函数曲线净压力估算/MPa	3.10	5.98	3.47	6.26
双对数曲线净压力估算/MPa	3.00	6.73	4.21	5.33
净压力拟合值/MPa	3.14	7.02	4.16	5.80
裂缝半长/m	75.00	103.00	72.00	118.00
裂缝高度/m	28.00	34.60	52.00	38.90
裂缝无因次导流能力	0.25	0.36	0.52	0.32

方法	压裂前		压裂后
方法	气EUR/ 10? m3	油EUR/ 10? m3	气EUR/ 10? m3	油EUR/ 10? m3
Duong+双曲递减	0.176 5	0.769 4	0.353 9	1.224 0
YM-SEPD+双曲递减	0.166 0	0.734 1	0.204 6	0.926 9
修正双曲递减	0.165 7	0.733 3	0.217 1	1.004 0
归一化产量/累产量	0.192 4	0.820 7	0.262 4	1.121 5
双曲递减	0.194 0	0.825 7	0.225 8	0.939 8

概率	压裂前		压裂后
概率	气可采储量EUR/ 10? m3	油可采储量EUR/ 10? m3	气可采储量EUR/ 10? m3	油可采储量EUR/ 10? m3
P??	0.128 0	0.675 4	0.120 9	0.714 6
P??	0.146 8	0.719 2	0.163 8	0.829 6
P??	0.173 5	0.776 9	0.237 7	0.996 2
P??	0.205 1	0.839 2	0.345 0	1.196 4
P?	0.235 1	0.893 6	0.467 5	1.389 0
P??/P??	1.397 1	1.166 9	2.106 2	1.442 1
统计平均值	0.175 0	0.778 3	0.248 0	1.006 5
Swanson（斯万森）平均值	0.175 0	0.778 3	0.247 8	1.006 3

Evaluation of multi-stage fracturing a horizontal well of low permeability reservoirs in East China Sea

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