Horizontal Well Segmented Setting Wellhead Flow Method for Finding Water String and Its Water Finding Method
A technology of finding water pipe string and flow method, applied in wellbore/well components, measurement, drilling pipe, etc., can solve the difficulty of unsealing the horizontal section of the Y441 two-way slip packer, the inability to run the cup packer, Complex construction process and other problems, to achieve the effect of short water search cycle, rapid water search, and simple construction process
Active Publication Date: 2017-09-01
PETROCHINA CO LTD
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Problems solved by technology
However, because some high water-cut horizontal wells often communicate with the corresponding water injection wells, the wellheads of high water-cut horizontal wells are self-flowing (casing back), which makes it impossible to run the cup packer. The horizontal section of the Y441 two-way slip packer is unsealed Difficult and complex construction process
Method used
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Embodiment
[0010] refer to figure 1 Embodiments of the present invention are further described:
[0011] The water finding string is connected with guide plug 1, liner 2, K344 hydraulic packer 3 and tubing 4 in the downhole horizontal section from the toe to the heel. The tubing 4 is connected to the tubing cock 5 at the wellhead, and the wellhead casing is connected Through the ground single volume device 6.
[0012] The specific steps of the method for finding water in the water pipe column are as follows:
[0013] 1) Run in the construction process string: After combining the water-seeking string, run it into the well, close the tubing cock 5, lower the K344 packer 3 to the predetermined position, and seal it between the first section and the second section. Make sure the return fluid comes out of the cannula.
[0014] 2) Combined layer production: continue to keep the oil pipe cock 5 closed, and connect the production process in the annular space. After 2-3 days of production, rec...
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The invention discloses a water finding tubular column of horizontal well section seat sealing wellhead flow method and a water finding method thereof. The water finding tubular column and the water finding method are designed for the water controlling and oil increasing measure for the horizontal well. A lead plug, a tail pipe, K344 fluid pressure type packer and an oil pipe are connected between the toe and the heel of the horizontal section in the well of the water finding tubular column, the oil pipe is connected with an oil pipe rotary plug at the wellhead and the wellhead sleeve is connected with a ground single measuring device. The water finding tubular column finds the water through the processes as follows: tripping in the tubular column, producing the composite layer, sealing via the seat sealing device, finding the water in sections and taking out the technology tubular column. The water layer section is confirmed according to the wellhead liquid production rate and water content change status, if the wellhead liquid production rate rapidly reduces or there is no water at the wellhead, the water section is found, if the wellhead liquid production rate does not change, the water point is on the perforation section, the tubular column is lifted upwards to the upper side of the upper perforation section for finding the water again until that the water layer section is found. The high water content blowing (returning) horizontal well test water finding technology can be achieved, the water finding period is short and the construction technology is simple.
Description
technical field [0001] The invention relates to a water finding pipe string and a water finding method of a horizontal well segmental setting well head flow method, and belongs to the technical field of oil production in oilfields. Background technique [0002] At present, intelligent switches are used to regularly control the production of each layer in the segmented water detection test string of casing completion horizontal wells, and the water layer is judged through ground testing and analysis of water content in each segment. Each interval of this process is separated by a cup packer or a Y441 packer. However, because some high water-cut horizontal wells often communicate with the corresponding water injection wells, the wellheads of high water-cut horizontal wells are self-flowing (casing back), which makes it impossible to run the cup packer. The horizontal section of the Y441 two-way slip packer is unsealed Difficult and complex construction process. Contents of ...
Claims
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IPC IPC(8): E21B17/00E21B33/12E21B47/10
CPCE21B47/10
Inventor 朱洪征吕亿明牛彩云王百李大建崔文昊
Owner PETROCHINA CO LTD