Construction process of multi-branch underground screen pipe

Abstract

The invention discloses a construction process of a multi-branch underground screen pipe, which comprises the following steps of: 1, preparing; 2, drilling in advance; and 3, drilling and laying the screen pipe: drilling a first section of horizontal main shaft hole and a first section of branch well hole and laying the screen pipe, drilling the next section of horizontal main shaft hole and the next section of branch well hole and laying the screen pipe, repeating the operation until completing the drilling of a plurality of branch well holes and the laying the screen pipe, the drilling of the last section of horizontal main well hole and the laying of the screen pipe of the horizontal main well holes. The invention has the advantages of reasonable design, high construction efficiency, low investment input and good use effect, is convenient for operation, can effectively increase the yield of a multi-branch horizontal well, and effectively solves the defects of high investment cost, larger construction risk, complex construction step and difficult realization of the steps, low yield of the multi-branch horizontal well subjected to the construction, and the like in the traditional construction process of the multi-branch horizontal well.

Description

technical field [0001] The invention belongs to the technical field of multi-branch horizontal well construction, and in particular relates to a multi-branch horizontal downhole screen pipe construction process. Background technique [0002] At present, the following technical and technological problems still exist in the existing drilling procedures and completion methods of multilateral horizontal wells, which need to be solved urgently. [0003] First, due to the current domestic coal seam instability is very common, even within 20 days of drilling, there will be different degrees of falling off, falling blocks, or even collapse. Once the drilled wellbore is blocked, production will be very difficult However, the later drainage should last as long as possible. How to solve the contradiction between the two has always been the bottleneck restricting the development of the coalbed methane industry. [0004] Second, because the drilling procedure of existing multi-branch ho...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a multi-branch horizontal downhole screen construction process for the above-mentioned deficiencies in the prior art, which has reasonable design, simple operation, high construction efficiency, low input cost, good use effect, and effective Increase the output of multi-branch horizontal wells, and effectively solve the defects of the existing multi-branch horizontal downhole screen technology, such as high input cost, high construction risk, complicated and difficult construction steps, and low production of multi-branch horizontal wells after construction.

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