Pressure transfer eccentric water distribution blanking plug

Abstract

The invention discloses a pressure transfer eccentric water distribution blanking plug. The blanking plug comprises a lower main body and an upper main body which is connected with the lower main body, wherein the upper main body is connected with the lower part of a fishing rod; the lower main body is provided with a pressure transfer hole I along the axial direction; the upper main body is provided with a pressure transfer hole II along the axial direction; the lower part of the fishing rod is provided with a central hole along the axial direction; the middle part of the fishing rod is provided with at least two seal rings between which a necking section is arranged; a pressure transfer hole III is formed in the necking section; the pressure transfer hole I, the pressure transfer hole II and the central hole are communicated with the pressure transfer hole III; a spring is sleeved outside the lower part of the fishing rod; the front end of the spring is provided with a pressure transfer sleeve; the front end of the pressure transfer sleeve is provided with a through hole III along the radial direction; the fishing rod is positioned in the pressure transfer sleeve; the front end of the fishing rod is connected with a pressure transfer joint in which a pressure transfer hole IV is formed; and the pressure transfer hole IV is communicated with the through hole III. Through the blanking plug, the aim of simultaneously performing underground layered flow testing and seal examination testing is fulfilled during normal water injection of an eccentric layered water injection well.

Description

technical field [0001] The invention relates to an eccentric water distribution tool for layered water injection wells in an oil field, in particular to a pressure-transmissible eccentric water distribution plug. Background technique [0002] At present, the eccentric layered water injection technology plays a dominant role in my country's oil development layered water injection because of its technical advantages such as convenient testing and fishing, high process success rate, no series limit and no influence on the water absorption profile test. During normal water injection, the packer divides the oil layers of different properties into several water injection intervals, and the plug in the eccentric hole of the eccentric water distributor in each water injection interval seals the liquid outlet hole of the eccentric hole by two groups of four packings on the upper and lower sides. After the water enters the annular space of the oil and casing through the filter screen,...

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Problems solved by technology

[0004] 1. The workload of sealing inspection is heavy, and it is necessary to fish and replace the plugging pressure gauge or install a special three-parameter flowmeter and test the sealing section, which takes a long time and is labor-intensive.

[0005] 2. The sealing inspection process has great limitations. Wells with different well conditions need to adopt different sealing inspection methods. For eccentric split injection wells with complex well conditions, it is necessary to use a variety of sealing inspection methods for comprehensive analysis and judgment

[0006] 3. It is necessary to change the working system of the test well, which cannot meet the requirements of stable water injection in separate injection wells, resulting in string creep and interlayer channeling (through the well washing channel of the packer), which artificially increases the probability of packer failure;

[0007] 4. At present, all sealing inspection processes cannot test and record the stratified flow pressure of the eccentric split injection well under the stratified flow state during normal water injection, and cannot quantitatively obtain the pressure difference between the front and rear of the stratified water nozzle-nozzle damage, which is qualitative Analytical method testing the technical scope of the test seal

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