吉木萨尔页岩油井区CO2前置压裂工艺参数优化及现场实践

doi:10.13809/j.cnki.cn32-1825/te.2024.01.012

Abstract

Abstract:

The shale oil of Lucaogou Formation in Jimsar Sag has the characteristics of extremely low original permeability and high viscosity of crude oil, making it uneconomical to produce under natural conditions. Field practices have demonstrated that dense drilling combined with high-intensity volume fracturing is one of the most effective means to achieve large-scale development of shale oil. However, how to slow down the decline rate of oil wells and improve the recovery rate per well remains a pressing issue to be addressed. From 2019 to 2022, the researches and field tests of CO₂pre-fracturing assisted production technology were carried out in Jimsar shale oil block. The application effect of CO₂ pre-storage fracturing and CO₂ huff and puff in Jimsar shale oil block was systematically studied and analyzed. The results indicate that supercritical CO₂ has the effects of miscible energy increase, dissolution to improve reservoir conditions, improve imbibition replacement efficiency, and increase the complexity of fracture network. The optimal injection volume, injection speed, and injection methods were determined, and a preliminary technological system for CO₂ pre-fracturing in shale oil reservoirs was established. According to the prediction of production data, the CO₂ pre-fracturing process can increase the final recovery rate by about 20%, which provides a reference for realizing the benefit development of shale oil and improving the development effect of other types of shale reservoirs.

Key words: CO₂ pre-energizing fracturing, reservoir modification, crack propagation law, parameter optimization, Jimsar shale oil

CLC Number:

TE357

ZHAO Kun,LI Zeyang,LIU Juanli,HU Ke,JIANG Ranran,WANG Weixiang,LIU Xiuzhen. Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block[J].Petroleum Reservoir Evaluation and Development, 2024, 14(1): 83-90.

Figures/Tables 11

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样品编号	地层温度/ ℃	地层压力/ MPa	饱和压力/MPa	气油比/（m³/t）	驱替速度/ （mL/min）
A	89.2	39.3	5.6	20	0.2
B	98.1	44.4	5.8	23	0.2
C	82.8	36.7	3.3	14	0.2

层位	样品深度/m	岩性	黏土矿物含量/ %	常见非黏土矿物含量/%
层位	样品深度/m	岩性	黏土矿物含量/ %	石英	钾长石	斜长石	方解石	铁白云石
芦草沟组上“甜点”	3 146.54	砂质砂屑云岩	1.79	10.34		26.88	5.17	55.82
芦草沟组下“甜点”	3 264.65	白云质砂屑砂岩	0.91	10.32		17.55		71.22
	6 267.19	泥质粉砂岩	1.91	14.77	12.66	42.19	21.09	7.38
	3 300.17	云质粉砂岩	3.22	13.35	11.12	38.93	3.34	30.04

井号	工艺参数
井号	油藏中部深度/m	水平段长度/m	油层钻遇率/m	改造段长度/m	簇间距/m	总液量/m³	总砂量/m³	加砂强度/（m³/m）
试验井A	3 810	1 510	90.00	1 433	15.9	42 608.7	2 900	2.0
对比井B	3 663	2 012	76.38	2 012	15.1	59 377.2	4 050	2.0
对比井C	3 563	2 015	96.18	1 300	15.3	35 615.6	2 710	2.1
对比井D	3 471	1 540	63.73	982	14.7	29 015.0	1 980	2.0

Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block

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Parameter optimization and field practice of CO2 pre-fracturing process in Jimsar shale oil block

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Parameter optimization and field practice of CO₂ pre-fracturing process in Jimsar shale oil block