Controlling factors of morphology and flow capacity of acid-etched fracture system: A case study of the reservoir in the Ma55 sub-member of Ordovician Majiagou Formation in the Daniudi Gasfield of the Ordos Basin

被引：0

作者：

Guo J. ^{[1
]}

Chen F. ^{[1
,2
]}

Gou B. ^{[1
,3
]}

Li J. ^{[2
]}

Wang S. ^{[1
]}

Xiao H. ^{[4
]}

Ren J. ^{[1
]}

机构：

[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan

[2] Sinopec North China E & P Company, Zhengzhou, 450000, Henan

[3] Post-doctoral Research Center, Southwest Petroleum University, Chengdu, 610500, Sichuan

[4] School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing

来源：

Natural Gas Industry | 2020年 / 40卷 / 06期

关键词：

Acid-etched fracture system; CT scanning; Daniudi Gasfield; Fracture flow capacity; Fracture morphology; Ordos Basin; Physical simulation experiment; Three-dimensional acid fracturing; Tight carbonate rock;

D O I：

10.3787/j.issn.1000-0976.2020.06.007

中图分类号：

学科分类号：

摘要：

Three-dimensional stimulation technology is one of the key technologies in the three-dimensional development of heterogeneous carbonate oil and gas reservoirs, and its core lies in controlling the morphology and flow capacity of acid-etched fracture system. In order to reveal the main factors controlling the morphology and flow capacity of acid-etched fracture, outcrop samples from the Ma55 sub-member of Majiagou Formation, Lower Ordovician in the Daniudi Gasfield of the Ordos Basin were studied to conduct laboratory physical simulation experiments on the acid fracturing technology of "slick water + high-concentration acid" by using the true triaxial coupling system of rock mechanics. CT scanning technology was employed to characterize the morphology of acid-etched fracture system and calculate fracture width. Based on this, the main factors controlling the morphology of acid-etched fracture system were studied along with the factors controlling the flow capacity of acid-etched fracture system by testing the permeability of the fracture system. The average horizontal principle stress difference coefficient of the reservoir in the Ma55 sub-member of Majiagou Formation in the Daniudi Gasfield was 0.25, thus, a complex fracture system can be generated after acid fracturing. The influence of acid on the number of fractures was not obvious, but its dissolution and communication action on hydraulic fractures increased the fracture width. The width of acid-etched fractures was the competitive flow and reaction result of acid between the main hydraulic fractures and the branches and between the hydraulic fractures near the acid injection entrance and the ones far away. As for the reservoir in the Ma55 sub-member of Majiagou Formation in the Daniudi Gasfield, the reasonable acid injection volume per reservoir thickness of acid fracturing was 12 cu m/min and the acid injection rate shall be no less than 6 cu m/min. When designing three-dimensional acid fracturing, the reasonable range of acid injection volume and the minimum reasonable acid injection rate for a specific reservoir to be stimulated should be determined, and then optimized the acid injection scale to fully stimulate the reservoir.

引用

页码：69 / 77

页数：8

共 20 条

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