A Completion Method with Embedded Window Sealing for Six-level Branch Wells
A branch well, built-in technology, applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., can solve problems such as failure to reach the six-level completion level of branch wells, insufficient sealing, etc., to improve The effect of single well production, enhanced adaptability, and high strength
Active Publication Date: 2017-01-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
It overcomes the insufficient hydraulic sealing of the existing window and cannot reach the six-level completion level of branch wells
Method used
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[0021] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 As shown, a six-level branch well embedded window sealing completion method, the method steps are as follows:
[0022] 1. After the drilling of the second branch hole is completed, the directional hollow deflector 2 is lowered into the main wellbore first, and the slope of the directional hollow deflector 2 is aligned with the direction of the window, and then the lower end is connected to the completion string The mechanical hanger 1 is lowered into the branch wellbore, and the convex key 11 on the upper end of the directional hollow deflector 2 cooperates with the groove 10 on the upper part of the mechanical hanger 1 to form a self-lock, and forms a mechanical support at the bifurcation of the window;
[0023] 2. In-pipe anchor 7, directional nipple 8, and expansion bifurcation device are connected sequentially from top to bottom. The expansion bifurcation device is composed of main pipe...
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The invention relates to the technical field of branching well drill well completion technologies, in particular to a six-level branching well built-in window sealing well completion method. The method includes the following steps that after a second branching well is drilled, firstly an orienting hollow deflector is put in a main well, the inclined face of the orienting hollow deflector is aligned with a window in direction, the lower end of the deflector is connected with a mechanical hanging device with the lower end connected with a well completion pipe column is put in a branching well, a protruding key at the upper end of the orienting hollow deflector is matched with a groove in the upper portion of the mechanical hanging device to form self-locking, and mechanical supporting is formed at the crotch of the window. By means of the six-level branching well built-in window sealing well completion method, high-strength mechanical supporting and good waterpower airtightness are provided for the window, the branching well six-level well completion level is achieved, technical support is provided for large-scale application of branching wells, a branching well technology is made to be combined with a later fracturing and stimulation means, single-well yield is further increased, and the adaptability of the branching well technology is improved.
Description
[0001] Technical field: [0002] The invention relates to the technical field of drilling and completion of branch wells, in particular to an embedded window sealing completion method for six-level branch wells. [0003] Background technique: [0004] The key technology of branch wells lies in the hydraulic sealing and mechanical support performance of the windows connecting the main wellbore and branch wellbore. At present, the branch well technologies in various domestic oilfields have solved the mechanical support of the window, and can perform four-stage well completion. However, with the popularization and application of branch well technology, the problem of single stimulation measures in the later stage has gradually come to light. The level of the well is raised to level six, so that the branch well fracturing technology can get a breakthrough. The six-level branch well technology in foreign countries is to drill the branch at the branch, first through reaming, then ru...
Claims
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IPC IPC(8): E21B33/13
CPCE21B23/00E21B29/06E21B29/10
Inventor 李虎尚宪飞李敏赵云刘延强孔栋梁高扬曹雪峰周阳强卫东
Owner BC P INC CHINA NAT PETROLEUM CORP