A coiled tubing segmental fracturing string and string fracturing method
A technology for staged fracturing and oil tubing, which is applied in the field of staged fracturing and coiled tubing staged fracturing string to achieve the effects of improving the complexity, improving the fracturing stimulation effect, and making the staged fracturing method simple and convenient.
Active Publication Date: 2022-05-20
中石化石油工程技术服务有限公司 +1
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Problems solved by technology
[0004] However, the two coiled tubing fracturing methods are ordinary continuous sanding, relying on static pressure to open fractures and then extend the fractures. This construction method is not easy to form complex fractures and fracture networks, and it is not conducive to improving the recovery of tight oil and gas reservoirs. there are certain limits
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0038] Such as figure 1 As shown, the coiled tubing staged fracturing string 100 of the present invention includes a safety joint 3, a hydraulic injector 4, a centralizer 5 and a mechanical positioner 8 that are sequentially connected to the coiled tubing 1, and the centralizer 5 and the mechanical positioner A controllable switch-type pulse sand blaster 6 and a mechanical packer 7 are also connected between the devices 8, and a guide head 9 is provided at the other end of the mechanical positioner 8, and the components are connected through oil pipe threads.
[0039] Such ...
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The present invention proposes a segmental fracturing string of coiled tubing, including a safety joint, a hydraulic injector, a centralizer and a mechanical positioner sequentially connected to the coiled tubing, between the centralizer and the mechanical positioner It is also connected with a controllable switch type pulse sand blaster and a mechanical packer. The segmented coiled tubing fracturing string of the present invention has a simple structure, quick layer-changing construction, high reliability and safety of the string, and can realize multi-stage and multi-stage sandblasting perforation, The multi-stage fracturing operation combined with bottom-hole sand mixing fracturing and annular large-volume fracturing can form a complex fracture network, increase the swept volume of tight reservoir stimulation, and improve the staged fracturing operation of tight oil and gas reservoirs. Efficiency, reduce development cost and improve fracturing development effect. The invention also provides a segmented fracturing method using the coiled tubing segmented fracturing string.
Description
technical field [0001] The invention relates to the technical field of downhole fracturing operations, in particular to a coiled tubing segmental fracturing string and a segmental fracturing method using the fracturing string. Background technique [0002] In recent years, studies at home and abroad have shown that increasing the complexity of fractures during fracturing operations can effectively increase the single-well production of low-permeability oil and gas reservoirs, and ultimately improve the recovery of oil and gas reservoirs. At present, volume fracturing is the main technical means to develop and construct complex fracture networks in unconventional shale gas reservoirs. Expansion and brittle rocks produce shear slip, forming a fracture network in which natural fractures and artificial fractures intersect. However, the construction cost of this technology is high, and it is not suitable for the development of tight oil and gas reservoirs. The general method of ...
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IPC IPC(8): E21B43/26E21B43/114E21B43/267E21B43/14
CPCE21B43/26E21B43/114E21B43/267E21B43/14
Inventor 李洪春李奎为蒋廷学陈作贾长贵刘红磊周珺周林波侯磊
Owner 中石化石油工程技术服务有限公司