海上致密砂岩气藏体积酸压技术研究

doi:10.13809/j.cnki.cn32-1825/te.2020.05.018

Abstract

Abstract:

The stimulation of offshore tight sandstone gas reservoirs is influenced by several factors. In order to promote the efficient development of offshore tight sandstone gas reservoirs, volumetric acid fracturing technology of offshore tight sandstone gas reservoirs is studied. And then, considering 3 problems of acid fracturing in sandstone reservoirs, 6 requirements for geology and engineering are put forward. Based on the analysis of reservoir lithological characteristics, brittleness index, stress characteristics and natural fracture development of the offshore gas field, the geological and engineering conditions of sandstone reservoir volume acid pressure are summarized. Aiming at the problems of abnormal high temperature, high breakdown pressure, water lock damage and serious water sensitivity damage, an acid liquid system is developed. The formula was 8 %HCl+5 %SA702+60 %NaBr+1 %WD-12+5 %SA601+1.5 %HJF+10 %ethanol+1 %SA1-1+1 %WD-5B+1.5 %SA1-7. Acid pretreatment can effectively reduce reservoir fracture pressure, and 9.5 MPa is reduced when applied. Volume acid fracturing is reformed by the interlayer temporary plugging steering technology using 1.5 % fibre with the length of 6 mm+0.8 % small particle+1.2 % large particle. The single well increased production ratio was 7.1, and the yield increasing effect was remarkable. This technology can provide theoretical basis and technical support for the development of tight sandstone gas reservoirs.

Key words: offshore gas field, tight sandstone, volumetric acid fracturing, acid system, acid pretreatment, temporary plugging steering

CLC Number:

TE357

CHEN Xiang,ZHAO Liqiang,LI Xiaofan,HU Binghua,HU Zhongtai,YAO Fengsheng. Volumetric acid fracturing technology of offshore tight sandstone gas reservoirs[J].Reservoir Evaluation and Development, 2020, 10(5): 120-126.

Figures/Tables 11

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References 22

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岩心编号	矿物百分含量/%
岩心编号	黏土总量	石英	斜长石	钾长石	方解石	白云岩
5#	18.7	60.4	6.3	8.9	5.2	0.5
38#	25.1	56.3	11.5	2.3	3.3	1.6
62#	13.3	62.8	13.1	3.3	5.6	1.9

酸液类型	溶蚀率/%
12 %HCl	7.20
12 %HCl+3 %HF	31.90
研制的酸液	23.50

裂缝宽度/mm	封堵强度/（MPa·m^-1）
裂缝宽度/mm	0.5 %纤维	1 %纤维	1.5 %纤维
1.0	7.8	12.7	16.4
2.0	5.3	9.8	14.1

Volumetric acid fracturing technology of offshore tight sandstone gas reservoirs

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