渝东南地区茅口组气藏大石1HF井酸压工艺技术研究

doi:10.13809/j.cnki.cn32-1825/te.2020.05.012

Abstract

Abstract:

Significant advances has been made in the exploration and development of deep gas reservoirs in the southeastern Chongqing, especially the deep shale gas. While the shallow gas exploration is on the contrary, especially the shallow fracture-matrix limestone gas reservoir, Maokou Formation, with low porosity, low permeability, low fracture development, low reservoir temperature, low pressure coefficient, and mediocre fracture development. During the acid fracturing process, as the gel is hard to break by acid and the flow back is difficult, then the effect is poor, and it is difficult to make breakthrough. Taking the characteristics of carbonate reservoir, Maokou Formation in well-Dashi-1HF, as the example, the difficulties in reservoir acid fracturing have been analyzed, the self-degradation gelling acid has been synthesized, the mechanism of degradation has been introduced, and the optimization of the acid-liquid system has been carried out. The horizontal well acid fracturing pipe string has been optimized to form acid fracturing technology of self-degradation gelling acid and multilevel packer, at the same time, the segmented acid fracturing parameters have been optimized. 4 stages acid fracturing of well-Dashi-1HF has been completed, and the total acid dosage is 2 129.2 m³. The test gas production after acid fracturing is 22.6×10⁴ m³/d. The results show that this new technology has a good effect in the shallow limestone of southeastern Chongqing, and provides useful reference for the acid fracturing of similar layers in the future.

Key words: shallow gas in southeastern Chongqing, limestone, horizontal well, self-degradation gelling acid, staged acid fracturing

CLC Number:

TE357.2

Lin LEI,Longsheng ZHANG,Wei XIONG. Acid fracturing technology of Maokou Formation in well-Dashi-1HF, southeastern Chongqing[J]. Reservoir Evaluation and Development, 2020, 10(5): 84-90.

Figures/Tables 15

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References 21

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稠化剂代号	加量/（g·L^-1）	酸溶时间/min	黏度/（mPa?s）
BFC-13	0.3	30	34
	0.4	35	43
	0.5	46	50
	0.6	58	56
	0.7	72	61
CX-208	0.3	40	23
	0.4	60	31
	0.5	80	37
YLG-1（乳液）	0.7	20	21
	1.0	25	26
	1.3	30	31

缓蚀剂	加量/（g·L^-1）	腐蚀速度/[g?（m²?h）^-1]	是否发生点蚀
BFC-17	1	0.35	否
BFC-17	2	0.18	否
YLH-1	1	0.40	否
YLH-1	2	0.20	否
YHS-2	1	1.00	否
YHS-2	2	0.80	否
SD-820	1	0.90	否
SD-820	2	0.70	否

铁离子稳定剂	加量/（g?L^-1）	稳定Fe³⁺能力/（mg?mL^-1）
TW-15	10	136
HAC	10	86
YLF-1	10	130
FCA	10	85

名称	加量/（g·L^-1）	表面张力/（mN?m^-1）
BZP-03	0.3	26.5
	0.4	23.2
	0.5	22.1
AM-C	0.3	27.9
	0.4	25.0
	0.5	23.1
CF-5A	0.3	27.8
	0.4	23.3
	0.5	22.6

温度/℃	流态指数	稠度系数/（mPa?sⁿ）	黏度/（mPa·s）
温度/℃	流态指数	稠度系数/（mPa?sⁿ）	40 s^-1	100 s^-1	170 s^-1
25	0.460	0.009 51	82.5	58.1	48.0
50	0.459	0.007 62	68.9	50.5	36.0
60	0.473	0.005 21	36.8	22.3	17.6
75	0.560	0.002 76	26.9	17.2	14.8

Acid fracturing technology of Maokou Formation in well-Dashi-1HF, southeastern Chongqing

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温度/ ℃	酸浓度/ （mol?L^-1）	岩心直径/ cm	摩尔浓度/ （mol?L^-1）	反应时间/ s	酸液体积/ cm³	反应速度/ [mol?（s?cm²）^-1]	氢离子传质系数/ （cm²?s^-1）
50	5.625 4	3.815	0.069 8	180	500.1	3.176 1×10^-5	6.50×10^-6
	4.517 3	3.812	0.067 5	180	500.1	2.457 9×10^-5	7.13×10^-6
	3.695 1	3.816	0.036 9	180	500.3	1.949 0×10^-5	5.64×10^-6
	2.483 7	3.810	0.035 1	180	500.0	1.230 7×10^-5	3.15×10^-6

性能参数	参数值
酸液黏度（25 ℃）/（mPa·s）	≥25
酸液密度/（g·cm^-3）	1.09~1.11
滤失系数/（10^-4 m·min^-0.5）	3.08
缓速率/%	≥85.0
残酸表面张力/（mN·m^-1）	≤30
残酸界面张力/（mN·m^-1）	≤5
腐蚀速度（45 ℃）/[g·（m²·h）^-1]	≤3.0
铁离子稳定能力/（mg·L^-1）	≥1 600
配伍性	无絮凝、不分层、无沉淀

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岩心号	伤害前渗透率K₁/10^-3 μm²	伤害后渗透率K₂/10^-3 μm²	伤害率/ %	平均伤害率/ %
1	0.135	0.105	22.22	21.55
2	0.091	0.072	20.88