Abstract
In the development of the Fuling shale gas field, for the first time, Well R9-2 was selected for a test of time-phased staged fracturing and refracturing treatments to study the effectiveness of fracturing at each stage for a novel development approach exploration. This paper introduces the design of the experiments, analyzes the results, and provides a follow-up evaluation of the entire development process. As of 9 August 2020, the well had gone through three phases of development. Phase I: time-phased staged fracturing and development for Stages 1–2, 3–4, 5–6, and co-development for Stages 1–6; Phase II: Stages 1–6 were developed once more after refracturing; Phase III: sealing the sections in Stages 1–6, then fracturing and development of Stages 7–19. Pressure build-up tests were conducted during the development of Stages 1–2 and 3–4, and gas production profile logging and microseismic monitoring were performed during the co-development of Stages 1–6. The results show that the combination of time-phased staged fracturing and refracturing treatments can fracture each stage more effectively. The pressure build-up test can effectively obtain the reservoir parameters of developed shale gas wells. The potential of refracturing treatment in a developed well can be identified from the gas production profile logging and microseismic monitoring. The findings are of this study productive for enhanced shale gas recovery; the combined pattern of time-phased staged fracturing and refracturing acts as a direct guideline to future shale gas production.
Highlights
Shale gas reservoirs are characterized by low porosity, extremely low permeability, and no natural productivity [1], [2]
Well R9-2 is a horizontal well used for a development test in this shale gas field, and worldwide is the first to undergo time-phased staged fracturing and refracturing tests
In the early stage of development in the study area, to understand the actual development of shale gas horizontal wells after fracturing in each stage and explore the possibility of a new development pattern, Well R9-2 was selected for the time-phased staged fracturing test
Summary
Shale gas reservoirs are characterized by low porosity, extremely low permeability, and no natural productivity [1], [2]. Horizontal well fracturing is usually required to establish commercial productivity, which depends on the development of hydraulic fracturing in long horizontal wells for a long time afterward [3], [4]. The development of shale gas horizontal well technology has led to staged fracturing technology in horizontal wells. To improve the efficiency of shale gas development, the "multi-well pad" fracturing pattern is adopted in the development of horizontal well fracturing technology [6], [9]. The pattern is characterized by continuous operation, which can greatly improve the utilization rate of fracturing equipment and reduce the frequency of equipment movement and installation, VOLUME XX, 2021
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
