High-Energy Gas Fracturing (HEGF) Technology: Research and Application
- Weiyu Yang (Xian Petroleum Inst.) | Chunhu Zhou (Xian Petroleum Inst.) | Fadong Qin (Xian Petroleum Inst.) | Dang Li (Xian Petroleum Inst.)
- Document ID
- Society of Petroleum Engineers
- European Petroleum Conference, 16-18 November, Cannes, France
- Publication Date
- Document Type
- Conference Paper
- 1992. Society of Petroleum Engineers
- 3 Production and Well Operations, 4.1.2 Separation and Treating, 5.4.2 Gas Injection Methods, 2.2.2 Perforating, 1.14 Casing and Cementing, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2.4.3 Sand/Solids Control, 3.2.4 Acidising
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HEGF is an oil/gas well stimulation technology by means of propellant inflamming in wells to produce multiple radial fractures in formation and hence to enhance the well production. The paper summarizes the achievements of our effort on research and application of the technology. For understanding the HEGF mechanism, laboratory and field experiments are conducted and numerical simulators are studied. The treatment design method and implementation techniques are discussed. A design software, which includes the content of propellant burn, perforation, stemming liquid motion, fracture propagation, fluid flow in fracture, and production increase prediction etc. , has been developed to serve as the basis of the design, optimization, and control of the technology. The application of the technology to exploratory, production and injection wells shows its great prospects in oil and gas industry.
The high energy gas fracturing (HEGF) is an oil/gas well stimulation technology by means of propellant inflamming in wells to produce multiple radial fractures in formation and hence to enhance the well production. Generally, the HEGF pressure histories only last tens or hundreds of milliseconds. Because of the high level of pressure rising rate, HEGF can produce a multiple radial fracture system which is not dominated by formation insitu stresses, as shown in figure 1. The mechanism that HEGF can enhance the well production lies in that the produced multiple radial fractures can:
* provide more chances to link with formation natural fissures; * eliminate the artificial pollution in the vicinity of wellbores; * increase the permeability of tight formation.
Compared with other stimulation technologies, such as hydraulic fracturing and acidizing. HEGF possesses merits of :
* cheapness in operation cost; * simpleness in implementation; * little pollution to formation.
The research on HEGF was initialized in the United States and former Soviet Union in 1970's and 1960's respectively and great achievements in the research and field application have been acquired since then. China began its research on HEGF in 1985. The early effort was put on naked wells. After gaining satisfactory benefit, the emphasis was shifted to cased holes. At present, HEGF is utilized in naked wells as a routine stimulation method and applied in more than 300 cased holes, with maximum depth over 3000 meters.
This paper will present a discussion the HEGF design and implementation techniques on the basis of outlining the achievements of our effort on research and application of the technology for years.
For understanding the HEGF mechanism. laboratory and field experiments are conducted and numerical simulators are studied.
Laboratory And Field Experiments
The initial goal of laboratory experiments is to seek the relationship between load rising rate and radial fracture pattern.
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