Research and Field Test of Deflagration Fracturing Technology in Offshore Oilfields

There are technical challenges in the safety and high-efficiency stimulation by blasting fracturing in offshore oilfields, and in response a high temperature, low firepower and low burning rate propellant has been developed, and in addition, we have established a deflagration fracturing simulation model. By utilizing safety string components and conducting safety calibration, a wellhead pressure relief method for the offshore oilfields has been formed. Through the enhanced software simulation and combined acidizing operation, it can improve the technical safety and enhance the stimulation effect, so as to form the deflagration fracturing technology for offshore oilfields. This technology has been tested in 8 wells in offshore oilfields. In those offshore fields, the peak pressure of the test well was 22.4–71.3 MPa. There was no safety problem in the string, and the average daily oil increment per well was up to 43.1 m³/d. The research showed that this deflagration fracturing technology had good adaptability in offshore oilfields, which is suitable for a variety of well conditions, with the advantages of safety control and high-efficiency stimulation technology in deflagration fracturing in offshore oilfield, it can improve the application safety and optimize the results from stimulation.