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

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...

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