A ball-throwing temporary plugging layered fracturing method for heterogeneous reservoirs
A technology for heterogeneous reservoirs and layered fracturing, which is used in earth-moving drilling, wellbore/well components, and production fluids. It can improve the success rate of setting, increase the degree of vertical production, and increase the production of a single well.
Active Publication Date: 2020-04-10
PETROCHINA CO LTD
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Problems solved by technology
[0003] Ball-throwing temporary plugging layered fracturing is an economical and easy method, but at present it is mainly based on experience, there is no effective systematic method to guide on-site construction, the success rate of plugging is low, and it cannot reach the goal of improving profile producing degree and single well production. Purpose, has caused certain hindrance to the popularization of this technology, is the technical problem that needs to be solved urgently
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[0040] This embodiment takes a specific oil and gas well as an example for the heterogeneous reservoir ball throwing temporary plugging layered fracturing method provided by the present invention (flow chart and schematic diagram as shown in Figure 1-2 shown in ) for illustration, where the logging interpretation results and perforation layer data of this oil and gas well are shown in Table 1.
[0041] Table 1
[0042]
[0043]According to the results in Table 1, and according to the fracture pressure calculation method, that is, formula (1), the calculated fracture pressure values of A, B, and C perforation sections are 62MPa, 48MPa, and 54MPa, respectively. Therefore, the sequence of fracturing initiation is B, C, and A, and the corresponding interval numbers are 1, 2, and 3, respectively.
[0044] According to the production situation of this well, its cumulative oil production is 4,490 tons, and the average cumulative oil production of adjacent wells is more than 10...
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The invention provides a ball-throwing temporary plugging layered fracturing method for a heterogeneous reservoir. The method includes: successively numbering reservoir sections to be fractured to m according to the fracture starting sequence, wherein the m is an integer and is greater than or equal to 2; determining if a number 1 reservoir section is fractured or not, and determining a target reservoir section, if packers or bridge plugs and sealing positions thereof are arranged or not, the number of temporary plugging balls to be thrown in each section, the ball throwing manner, and the desired construction discharge; firstly fracturing the number 1 reservoir section if the number 1 reservoir section needs to be fractured, throwing the temporary plugging balls to the number 1 reservoirsection so as to seal perforations, allowing a fracturing fluid to no longer enter the number 1 reservoir section, achieving increase in the pressure of a shaft, pressing a number 2 reservoir section,and fracturing the number 2 reservoir section; and throwing the temporary plugging balls to the number 1 reservoir section if the number 1 reservoir section does not need to be fractured so as to seal the perforations in the number 1 reservoir section, and allowing the later fracturing fluid to no longer enter the number 1 reservoir section, achieving increase in the pressure of a shaft, pressinga number 2 reservoir section, fracturing the number 2 reservoir section and so no, and completing fracturing of the m reservoir section.
Description
technical field [0001] The invention relates to a ball-throwing temporary plugging layered fracturing method for heterogeneous reservoirs, which belongs to the technical field of exploration and development of oil and gas fields, and specifically belongs to the technical field of well-type layered transformation of exploration wells, development wells, water injection wells and the like. Background technique [0002] Fracturing technology is an important offensive stimulation technology in the development of oil and gas fields, especially for difficult-to-produce reservoirs with low natural productivity, strong reservoir heterogeneity, and poor physical properties. Layered fracturing is a technique of "one layer, one strategy" proposed for different intervals of the same well, which includes tool layering, liquid performance shifting layering and other methods. The ball-throwing temporary plugging layered fracturing technology is one of a kind. [0003] Ball-throwing tempor...
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IPC IPC(8): E21B43/26
Inventor 张合文鄢雪梅崔明月蒋卫东赫安乐梁冲
Owner PETROCHINA CO LTD