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Throwing type washable downhole pressure-bearing plugging device and plugging method thereof

A plugging device and drop-in technology, which is applied in the directions of sealing/isolation, earthwork drilling, wellbore/well parts, etc., can solve the problems of increasing production costs, difficult washing out of steel balls, and many construction procedures, and achieves improvement Construction speed, improvement of judgment of construction reliability, effect of reducing construction process

Inactive Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the pipe string pressure test tools currently used in underground construction sites have the defects of inconvenient operation and difficult washing out of steel balls, resulting in many construction procedures, environmental pollution, and increased production costs

Method used

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  • Throwing type washable downhole pressure-bearing plugging device and plugging method thereof
  • Throwing type washable downhole pressure-bearing plugging device and plugging method thereof

Examples

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings. see figure 1 and figure 2 , the downhole part of the drop-in type washable downhole pressure-bearing plugging device is connected with the surface part through the tubing, the downhole part is provided with a leather bowl assembly, the ground part is provided with a fishing assembly, and the fishing rod 2 of the leather bowl assembly is connected to the fishing assembly The fishing cap 14 that is formed cooperates, realizes the salvage to the leather bowl assembly by the fishing cap 14. The downhole part includes a leather cup assembly, a sealing tube 1 and a valve seat 7, one end of the sealing tube 1 is connected to the valve seat 7, and the other end is connected to the oil pipe, and the leather cup assembly is seated in the valve seat 7. The plugging method of the drop-in type washable downhole pressure-bearing plugging device is: the cup assembly is man...

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Abstract

The invention relates to a throwing type washable downhole pressure-bearing plugging device and a plugging method thereof. The throwing type washable downhole pressure-bearing plugging device and the plugging method thereof are applicable to constructions such as oil-water well tubular pile pressure testing, monolayer positioning and acidifying, layering acidifying, cementing and sand prevention. A downhole portion and a ground portion of the device are connected through an oil pipe, the downhole portion is provided with a cup assembly, the ground portion is provided with a fishing assembly, a fishing rod of the cup assembly is matched with a fishing cap of the fishing assembly so as to realize fishing the cup assembly. The cup assembly is manually placed into an oil pipe below a three-way barrel of the ground portion from the ground, is conveyed to a valve seat through an oil pipe pump, and can be fished by the fishing assembly of the ground portion when being washed. The throwing type washable downhole pressure-bearing plugging device can be used with a packer, a throttler and the like to realize acidifying, cementing and plugging construction of determining layers, and also can realize multilayer acidifying, plugging and sand prevention constructions through a tubular lifting pile. Whether the cup assembly is washed out or not is judged by observing moving positions of indicating screws, downhole working conditions can be conveniently judged, and construction is facilitated.

Description

technical field [0001] The invention relates to downhole plugging construction tools in the petroleum industry, in particular to a drop-in washable downhole pressure-bearing plugging device and a plugging method thereof, which are suitable for oil-water well string pressure testing, single-layer positioning acidification, layered acidification, injection Cement, sand control and other construction. Background technique [0002] In the process of petroleum development, pipe strings are used to realize production, and tools such as packers and throttles are also connected to pipe strings to realize acidification, cement injection, and sand control. The pipe string is often used for a long time, and it is difficult to determine the pressure difference resistance capacity, which brings difficulties to formulate production measures and determine construction parameters. At present, there are two main methods for testing the pressure difference of the pipe string in the well: one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12E21B31/12
Inventor 陈兴泉殷家富张培东黄建生朱庆利吴艳华孙毅然张威
Owner CHINA PETROLEUM & CHEM CORP
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