Horizontal well refracturing device and method based on open hole preset pipe string completion

Abstract

The invention relates to a horizontal well refracturing device and method based on open hole preset pipe string completion. Firstly, mill the ball seat of the original fracturing sliding sleeve in the preset pipe string to realize the full diameter of the wellbore and provide a channel for the repeated fracturing device to run in; through two well-passing procedures, the residual ball seat after the milling ball seat on the casing wall is removed steel slag and other sundries to reduce the risk of refracturing equipment being blocked; since the sandblasting port in the casing is already open after the initial fracturing, the gap between the tubing and the liner is blocked by the tubing packer , the tailpipe is blocked by the packer, and the tubing packer and the packer are respectively located on both sides of the same nozzle, so that the liquid outlet of the tubing is located in the space separated, and the back of the packer is sealed Complete repeated fracturing according to the pump injection procedure; after that, the tool will be unsealed when the pressure difference between the inside and the outside is the same, and the pipe string will be lifted up. The method realizes the purpose of repeated fracturing stimulation under the condition of completion of the open-hole prefabricated pipe string, prolongs the life of the oil well, and increases the production.

Description

technical field [0001] The invention relates to a horizontal well refracturing device and method based on open hole preset pipe string completion. Background technique [0002] At present, the staged fracturing technology of horizontal wells has become an important means for the development of tight and low-permeability oil and gas reservoirs. For different completion methods of horizontal wells, such as open hole prefabricated string or casing cementing, there are corresponding mature fracturing technologies. Among them, the open-hole packer staged fracturing process matched with the prefabricated string completion method, as shown in the attached figure 1 As shown, a three-stage wellbore structure is adopted, only the vertical section a is cemented, and the horizontal section b is not cemented. The liner 4, the packer 3 and the ball sliding sleeve 1 are combined in the horizontal section of the open hole, and the liner is used. 4. Suspension way to complete the well. Dur...

AI Technical Summary

Problems solved by technology

However, if the production condition of the horizontal well deteriorates and you want to refracture the horizontal section, due to the variable diameter of the ball seat of the sliding sleeve in the well, it is difficult to run conventional fracturing tools, which brings difficulties to the refracturing

[0004] The refracturing technology of horizontal wells in the prior art is generally used in cementing and completion horizontal wells, but the refracturing technology under the condition of open hole prefabricated string completion has not yet appeared

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