Laboratory study and field application of self-propping phase-transition fracturing technology

被引：0

作者：

Zhao L. ^{[1
]}

Zhang N. ^{[1
]}

Zhang Y. ^{[2
]}

Luo Z. ^{[1
]}

Yu D. ^{[2
]}

Liu P. ^{[1
]}

Chen W. ^{[1
]}

Liu G. ^{[2
]}

Du J. ^{[1
]}

Li N. ^{[1
]}

Chen X. ^{[1
]}

机构：

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

[2] PetroChina Huabei Oilfield Company, Renqiu

来源：

Natural Gas Industry | 2020年 / 40卷 / 11期

关键词：

Chemical-phase-transition proppant; Field application; Hydraulic fracturing; Performance test; Self-propping phase-transition fracturing technology; Solid-free;

D O I：

10.3787/j.issn.1000-0976.2020.11.007

中图分类号：

学科分类号：

摘要：

Conventional hydraulic fracturing technology generally has the problems of sand plugging, residue damage, equipment wear and difficult effective propping at the far end of the fracture. In this paper, a kind of self-propping phase-transition fracturing technology (SPFT) is proposed to solve these problems. That is to inject the phase-transition fracturing fluid system (PFFS) composed of phase-transition fluid (PF) and non-phase-transition fluid (NPF) into the reservoir. Under the action of formation temperature, phase transition from liquid to solid of PF occurs, and chemical-phase-transition proppant (CP) particles are generated to prop the hydraulic fractures. After NPF flows back, its occupied space serves as a high-speed flow channel of oil and gas. Finally, material performance evaluation, technological parameter optimization and field application were carried out. And the following research results were obtained. First, at 30℃, PFFS is a kind of solid-free liquid with good fluidity. And with the increase of temperature, CP particles are formed gradually. Second, the phase transition time of PF is adjustable, so it is suitable for reservoirs with different temperatures. Third, PFFS can generate CP with a particle size of 0.1-5.0 mm under the conditions of different formulas and different shear speed. Fourth, the fracture conductivity is directly proportional to the particle size, and the conductivity of CP is higher than that of quartz sand and ceramsite. Field application results show that the supporting means (such as fracture length and conductivity optimization, injection rate design, and temperature field simulation and calculation) further improve the SPFT system and can provide effective guidance for the field application of self-propping phase-transition fracturing. In conclusion, the success of field application confirms the feasibility of SPFT and it can be used as a new fracturing technology for reservoir stimulation. © 2020, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：60 / 67

页数：7

共 25 条

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