多级交替注入酸压工艺优化研究——以磨溪龙女寺构造龙王庙组储层改造为例

Abstract

Abstract:

In order to improve the accuracy of the acid fracturing by the multistage alternative injection in Longwangmiao Formation of Moxi-Longnvsi area, we studied the conservation rate of the conductivity of the acid corrosion fractures and the fracture surface morphology influence of different injection rounds, fluid groups and injection rate by the experiment and the numerical scanning. The results showed that the 3rd injection round obtained higher conservation rate of the conductivity of the acid etched fractures, and formed the acid corrosion groove through rock plate. With the increasing of the injection round, the increment of the conservation rate of the conductivity decreased gradually. With the same closing pressure and main acid, little different existed in the 3rd injection round when it took the gel and the authigenic acid as the preflush. With the increasing of the injection rate, the conservation rate of the conductivity of the acid etched fracture was more ideal. The optimized technology has been used in Longwangmiao Formation of Moxi-Longnvsi area. The acid-fracturing curves and fitting data indicate that the technology can realize the engineering purpose. It also provides an effective technical mean for the transformation of the low permeability reservoir.

Key words: multistage alternating injection, acid fracturing, conductivity of the acid corrosion fracture, rock beam scanning, technology optimizatio

CLC Number:

TE357

Jiexiao Ye,Li Li,Huifen Han, et al. Optimization research of multistage alternating acid fracturing: A case study of reservoir reconstruction for Longwangmiao Formation in Moxi-Longnvsi area[J]. Reservoir Evaluation and Development, 2018, 8(3): 46-50.

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References 15

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不同液体组合	酸导前后变化	R_y（轮廓最大高度）/mm	R_c（轮廓微观不平整的平均高度）/mm	R_a（轮廓算术平均偏差）/mm	L₀（轮廓展开长度）/mm	l₀（轮廓长度比）
冻胶前置液+胶凝酸三级交替注入	酸导前	0.137	0.024	0.025	149.335	1
	酸导后	1.738	0.317	0.195	210.576	1.006
	变化值	1.601	0.292	0.17	61.241	0.006
自生酸前置液+胶凝酸三级交替注入	酸导前	0.05	0.032	0.031	146.906	1
	酸导后	0.31	0.075	0.055	207.915	1.001
	变化值	0.26	0.043	0.024	61.009	0.001

不同注入速度	酸导前后变化	R_y（轮廓最大高度）/mm	R_c（轮廓微观不平整的平均高度）/mm	R_a（轮廓算术平均偏差）/mm	L₀（轮廓展开长度）/mm	l₀（轮廓长度比）
40 mL/min自生酸前置液+胶凝酸三级交替注入	酸导前	0.107 1	0.011	0.017 6	149.319 3	1.000 1
	酸导后	0.551 9	0.061 6	0.053 2	211.948 3	1.001 8
	变化值	0.444 8	0.050 6	0.035 6	62.629 1	0.001 7
150 mL/min自生酸前置液+胶凝酸三级交替注入	酸导前	0.066	0.01	0.014 9	148.804 7	1
	酸导后	2.577 8	0.838 6	0.243 3	221.354 6	1.046 3
	变化值	2.511 8	0.828 6	0.228 4	72.549 9	0.046 3

Optimization research of multistage alternating acid fracturing: A case study of reservoir reconstruction for Longwangmiao Formation in Moxi-Longnvsi area

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