Long well section sectional gravel filling tubular column for horizontal well and technique of long well section sectional gravel packing tubular column

Abstract

The invention relates to a long well section sectional gravel filling tubular column for a horizontal well and a process of the long well section sectional gravel packing tubular column. The long well section sectional gravel packing tubular column includes an inner tubular column and an outer tubular column, the inner tubular column includes a drill pipe string, a streaming device, an upper washpipe, a middle washpipe and a lower washpipe which are successively connected in a screw mode from left to right, the front end and the rear end of the middle washpipe are connected with the upper washpipe and the lower washpipe correspondingly through a filling valve mechanism, the filling valve mechanism includes an outer sleeve and an open valve core, the outer sleeve is connected with the upper washpipe, the middle washpipe and the lower washpipe in a screw mode, the outer sleeve is provided with filling holes in radial symmetry, and the filling holes form a mortar filling channel by regulating and controlling the open valve core; and the outer tubular column includes a drilling casing string, a suspension device, an upper screen pipe, an upper sealing pipe, a middle screen pipe, an lower sealing pipe and a lower screen pipe which are successively connected in a screw mode from left to right, the inner tubular column is arranged in an inner cavity of the outer tubular column, and the inner tubular column and the outer tubular column are fixedly connected into a whole through reverse threads. The long well section sectional gravel filling tubular column has the beneficial effects that regulation and control of an upper-lower filling valve mechanism is fully utilized for realizing sectional gravel filling operation.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a sectioned gravel-packing pipe column for a long section of a horizontal well and a process method thereof. Background technique [0002] In the process of gravel packing in the long section of a horizontal well, the efficiency of gravel packing plays a vital role in the sand control life and production life of the oil well. At present, the sand control completion method of general packing is mainly used for gravel packing with a horizontal section length of more than 300 meters. This kind of packing method is difficult to pack the gravel pack compactly, and cannot achieve effective packing and effective sand control in long well sections. The current solution one is to use pre-packed screens for sand control. This process pre-processes and installs a filling gravel layer outside the screens, and then runs them into the well together with the screens....

AI Technical Summary

Problems solved by technology

The above-mentioned patented technology is applicable to the completion of gravel-packed screens in horizontal wells and highly-inclined wells. In order to overcome the shortcomings of existing horizontal wells with insufficient gravel packing or insufficient packing, which leads to poor development effects of horizontal wells

However, this technology mainly has the following deficiencies: 1. This technology adopts a general packing method, which cannot carry out segmental gravel packing construction on long well sections of horizontal wells, and the gravel packing efficiency is not high

2. The process uses medium-density gravel filling, which is easy to be blocked during the construction process, resulting in construction failure

3. With this technology, the upper part of the sand retaining pipe is cemented after the construction is completed, and the sand retaining pipe cannot be fished out of the oil well when it needs to be operated later.

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