Plug for sand control

Abstract

The invention relates to a blanking plug for sand prevention. The blanking plug is characterized by comprising a fishing rod, an upper mandrel in threaded connection with the fishing rod, a lower mandrel connected with the upper mandrel and a connecting cylinder sleeved at the outside of the fishing rod and fixed with the upper mandrel through a shear pin; the other end of the upper mandrel is fixedly connected with the lower mandrel through a fastener, a centralizing sleeve and a sliding sleeve are sequentially sleeved at the outside of the connecting cylinder from left to right, and an elastic claw is connected in the centralizing sleeve through inner threads; an assembly hole used for mounting a projection is processed on the sliding sleeve, and the projection is installed in the assembly hole; and an assembly sleeve is sleeved at the outside of the sliding sleeve, the assembly sleeve is in threaded connection with a lower joint, and a sealing module and a limiting sleeve are installed on the assembly sleeve. The blanking plug for sand prevention is reasonable in structural design and is capable of being cooperatively connected with the current packer to be directly applied in temporary blockage for sand prevention, but also avoiding such risks as sand blockage, and the like, after burying sand for a long time and conveniently recycling the blanking plug used for a long time through a circulating passage and a pressure balancing hole in the blanking plug to prevent large risks of working at special well segments having lost well bottom or large voidage.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas well completion and exploitation, and in particular designs a sand control plug used for converting a packer and a supporting production packer into a temporary bridge plug. Background technique [0002] At present, in the oil production and completion industry of oilfields, it is necessary to carry out workover and tubing. For the sand control operation of some adjacent long-distance oil layer sections, it is generally necessary to use a plug to seal off the top of the adjacent single-layer gravel-packed sand control string. The production packer and supported production packer are temporarily converted into bridge plugs for sand control. In traditional similar sand control operations, when the plug is not used for pressure testing, perforation, and well cleaning on the upper layer of the packer, the following problems will occur: 1. It will pollute the lower oil layer of the packer a...

AI Technical Summary

Problems solved by technology

In traditional similar sand control operations, when the plug is not used for pressure testing, perforation, and well cleaning on the upper layer of the packer, the following problems will occur: 1. It will pollute the lower oil layer of the packer and cause a great impact on the lower oil layer ; 2. Due to the limitation of its structure, the traditional plug cannot be connected with the existing packer, and cannot be directly used for temporary plugging for sand control; 3. The plug for sand control is often buried in sand and gravel in actual work. Risks such as sand sticking and obstruction after burying sand; 4. The traditional plug has no pressure balance mechanism. For special well sections with large bottom hole leakage or shortfall, long-term use of the traditional plug may cause unrecoverable, which brings great harm to the operation. risk

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