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High pressure-bearing blocking method for perforation shot hole

A high-pressure, perforating gun technology, applied in the field of high-pressure plugging, can solve the problems that cannot meet the pressure-bearing requirements of the fracturing process, and the pressure-bearing capacity of blasthole plugging is high.

Active Publication Date: 2017-05-10
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for multi-stage fracturing in the process of oil exploration, the pressure-bearing capacity of blast hole plugging is high, and the traditional plugging method cannot meet the pressure-bearing requirements of the fracturing process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Plugging of misperforated blastholes during fracturing in an oilfield, 2 blastholes, the blasthole section is 3726-3727m, and the accumulated fluid volume under 40MPa is 1.5m in the pressure test 3 , After plugging, the pressure drop is less than 0.5MPa within 30 minutes, and the temperature at the blasthole position is 90°C under the condition of a pressure of 90Mpa.

[0052] The annular space between coiled tubing and casing is 0.01m 2 , coiled tubing outer diameter 50.8mm, length 5200m, steel grade 90, inner volume 7.6m 3 .

[0053] The blocking steps are as follows:

[0054] Run two fully-sealed bridge plugs with an outer diameter of 100mm, run the first fully-sealed bridge plug to 3747m with coiled tubing, set the seal, and pull out the coiled tubing; run the second fully-sealed bridge plug with coiled tubing to 3747m 3737m, set the seal, and pull out the coiled tubing. Fill the annular space, pressurize the annular space back to 90MPa, stabilize the pressure f...

Embodiment 2

[0068] During the fracturing process of a shale gas well, misperforated blastholes were blocked. There were 4 blastholes. 3 , under the condition of pressure of 75Mpa after plugging, the pressure drop is less than 0.3MPa in 30 minutes, and the temperature of the blast hole is 90°C.

[0069] The annular space between coiled tubing and casing is 0.01m 2 , coiled tubing outer diameter 50.8mm, length 4200m, steel grade 90, internal volume 5.6m 3 .

[0070] Proceed as follows:

[0071] Run two fully-sealed bridge plugs with an outer diameter of 100mm, run the first fully-sealed bridge plug to 3340m with coiled tubing, set the seal, and pull out the coiled tubing; run the second fully-sealed bridge plug with coiled tubing to 3330m, set the seal, pull out the coiled tubing, fill the annular space, pressurize the annular space back to 75MPa, stabilize the pressure for 30min without dropping, and pass the seal inspection of the fully sealed bridge plug;

[0072] Clear water pressur...

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Abstract

The invention discloses a high pressure-bearing blocking method for a perforation shot hole. A leak source is determined firstly, two whole sealing bridge plugs are plugged into the lower portion of the leak source, clear water pressure testing is conducted, the pressure for opening a stratum is determined, and then blocking is conducted. Gelatin spacer fluid and leaking stoppage glue are pumped into a continuous oil pipe to enable the leaking stoppage glue to enter a to-be-blocked perforation shot hole, and the continuous oil pipe is uplifted. Clear water is injected into the continuous pipe through extruding, and pressure keeping down and cement setting waiting are conducted. Finally pressure relief is conducted, and the continuous oil pipe is pulled out. According to the high pressure-bearing blocking method for the perforation shot hole, the blocking effect is good, the perforation shot hole with a large aperture can be blocked, the pressure-bearing capacity reaches 70 MPa or more, and the requirement for subsequent fracturing operation can be met.

Description

technical field [0001] The invention relates to the technical field of plugging in petroleum fracturing engineering, in particular to a high pressure-bearing plugging method for perforating blastholes. Background technique [0002] The exploration and development of shale gas has gradually emerged in China, forming a certain scale of exploration and development, and entering a stage of rapid development. After oil and gas wells are drilled, perforation and fracturing operations are required to effectively exploit shale gas. Sometimes perforation may be misfired, resulting in wrong blasthole positions and effective fracturing operations. At this time, blastholes need to be drilled. The pressure of the fracturing operation is very high, and the pressure-bearing capacity of the blast hole plugging is very high. [0003] The existing blasthole plugging method is generally to use a plugging agent, and adjust the ratio according to the leakage situation and geological conditions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/42C09K8/44
CPCC09K8/424C09K8/426C09K8/44E21B33/13
Inventor 许明标陈侃符合杨洋
Owner JINGZHOU JIAHUA TECH
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