Construction method of integrated layered filling device

Abstract

The invention relates to a construction method of an integrated layered filling device. According to the technical scheme, the construction method includes the following steps that firstly, a tubularcolumn is installed; secondly, a first layer of ground filling and annular filling is conducted, specifically, steel balls are thrown into a releasing core pipe from a well mouth, a liquid circulationpassage is built, then liquid is injected from the well mouth, a casing pipe valve is closed, sand is injected to an oil layer, and ground filling is completed; and then the casing pipe valve is opened, and sand-carrying liquid is injected into the releasing core pipe, so that annular filling is completed; and thirdly, a second layer of ground filling and annular filling is conducted, and after ground filling and annular filling are completed, releasing operation is conducted. The construction method of the integrated layered filling device has the beneficial effects that the problem that layered filling can not be achieved through an existing single-layer filling tool is solved; the problem that an inner filling tubular column and an outer filling tubular column of an existing designed layered extrusion filling tool are difficult to move is also overcome; the problems of opening and closing failure and inaccurate positioning are avoided; layered ground filling and annular filling ofmultiple oil layers are realized easily; the work efficiency is improved; and the cost is lowered.

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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