Construction method of an integral layered filling device

Abstract

The invention relates to a construction method of an integral layered filling device. Its technical plan includes the following steps: 1. Lower the pipe string; 2. Carry out the first layer of ground filling and ring filling; put steel balls into the core pipe from the wellhead to establish a liquid circulation channel; then inject liquid from the wellhead and close the Fill the casing valve with sand to the oil layer to complete the ground filling; then open the casing valve and inject the sand-carrying liquid into the core pipe to complete the ring filling; 3. Carry out the second layer of ground filling and ring filling, ground filling and ring filling After the filling is completed, the hand-losing operation is performed; the beneficial effect of the present invention is that the present invention solves the problem that the existing single-layer filling tool cannot be filled in layers, and also overcomes the internal problems in the layered extrusion filling tool of the existing design. The problem of difficult movement of the filling string and the external filling string avoids the problems of switch failure and inaccurate positioning, and realizes the layered ground filling and ring filling of multiple oil layers more easily, which improves the operation efficiency and reduces the cost.

Description

technical field [0001] The invention relates to a construction method of a petroleum workover tool, in particular to a construction method of an integral layered filling device. Background technique [0002] Oil well sand filling is one of the urgent problems to be solved in oilfield development. The main reason for oil well sand production is that the reservoir is loose cemented sandstone. In addition, in the middle and late stages of oilfield development, long-term water injection or gas injection production will also greatly damage the reservoir framework, resulting in sand production in oil wells. The hazards of sand production in oil wells are mainly manifested in three aspects: 1. The sand buries the production layer, causing the oil well to reduce or stop production; Casing damage makes the oil well scrapped, etc. Sand production in oil wells causes a large reduction in oil well production, a sharp increase in operating costs, and serious economic losses. In order ...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned defects in the prior art, to provide a construction method of an integral layered filling device, which solves the problem that a single-layer filling tool cannot be filled in layers, and also overcomes the problem of the existing design of the inner filling pipe. There is a problem that the column and the outer packing string are difficult to move, and at the same time, the ground filling and ring filling of the oil layer are realized, which improves the efficiency

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