Well-washing sand prevention integrated technique tubular pile

Abstract

The invention provides an integrated well cleaning and sand controlling technology string, comprising an upper ball valve and a suspending mechanism, a lower adapter, a collar, a sand-controlling screen, a flushing pipe, a centralizer, a connecting sleeve, a sealing body, a seal plug, a well cleaning valve and a plug, the upper ball valve comprises a valve body as well as the upper valve ball, a hole ball board, an upper spring and a plug arranged in the valve body, the well cleaning valve comprises a well cleaning valve body and a lower spring, a spring seat and a lower valve ball arranged in the well valve body, the upper valve ball and the suspending mechanism are connected with the lower adapter, the collar, the sand-controlling screen, the connecting sleeve, the well cleaning valve body and the plug below in sequence outwards, and are connected with the flushing pipe, the centralizer and the sealing plug of the well cleaning valve in sequence inwards; the sealing body is arrangedbetween the seal plug and the well cleaning valve body; the lower valve ball, the lower spring and the spring seat are arranged under the sealing plug in sequence. The technology string has double functions of sand controlling and well cleaning, can be widely applied in sand-controlling technology of oil exploitation.

Description

1. Technical field [0001] The invention relates to an oil production downhole operation pipe string, in particular to an integrated process pipe string for well washing and sand control. 2. Background technology [0002] The following disadvantages or deficiencies are found in the traditional well cleaning and sand control string during operation and construction: ①The sand control string has no well washing function, and another well cleaning string needs to be lowered during well flushing, which complicates the construction operation and wastes manpower and material resources , financial resources, and prolong the operation time; ②Especially in horizontal wells with serious sand production and high-inclination wells, when running large-diameter screens, sand plugging and sand sticking often occur, making it difficult for the sand control string to be in place smoothly, and even causing The damage to the sand control pipe string will be lost halfway until the salvage operat...

AI Technical Summary

Problems solved by technology

[0002] The following shortcomings or deficiencies have been found in the traditional well cleaning and sand control string during operation and construction: ①The sand control string has no well washing function, and another well cleaning string needs to be lowered during well flushing, which complicates the construction operation and wastes manpower and material resources , financial resources, and prolong the operation time; ②Especially in horizontal wells with serious sand production and high-inclination wells, when running large-diameter screens, sand plugging and sand sticking often occur, making it difficult for the sand control string to be in place smoothly, and even causing The damage to the sand control pipe string will be lost halfway until the salvage operation, which increases the difficulty of the operation and increases the operation cost

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