Chemical sealing rubber plug in snubbing operation string as well as preparation method and application of chemical sealing rubber plug

A pressurized operation and chemical technology, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve problems such as the limitation of the perfection of the plug, poor sealing effect, and inability to pass through

Inactive Publication Date: 2014-04-16
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing plugs have many structures and different effects, but there are defects such as "the insertion of the plug is limited by the perfection of the tubing string" and "the entire tubing string cannot be fully sealed"
The slip-type mechanical plug adopts an arc-shaped slip positioning device, which has a small contact area with the inner wall of the oil pipe, poor sealing effect, and inaccurate plug positions, and sometimes needs to deliver multiple or multiple plugs; the gravity-pressed rotary plug is adopted, When the diameter of the tubing string shrinks, it will cause the plug to be stuck in the middle and set in the middle; the st...

Method used

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  • Chemical sealing rubber plug in snubbing operation string as well as preparation method and application of chemical sealing rubber plug
  • Chemical sealing rubber plug in snubbing operation string as well as preparation method and application of chemical sealing rubber plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 20kg of acrylamide, 1kg of azobisisobutylamidine hydrochloride, 1kg of cross-linking agent N'N-methylenebisacrylamide, 49kg of carboxymethyl guanidine with a molecular weight of 1 million and 3kg of sodium montmorillonite Add it into 900kg of water, stir and mix evenly, and then add the above mixture together with 20kg of ammonium persulfate microcapsules into the pressurized operation column. After waiting for 60 minutes, the chemical plugging rubber plug will be formed in the pressurized operation column.

[0025] Experiments have measured that the pressure bearing capacity of the chemical plugging rubber plug of this embodiment is 20 MPa, and the rubber plug degrades after 5 days.

Embodiment 2

[0027] 49kg of acrylamide, 1.9kg of azodicyanovaleric acid, 3kg of N'N-methylenebisacrylamide, 30kg of xanthan gum with a molecular weight of 1 million and 4kg of sodium montmorillonite were added to 860kg of water and stirred, Then above-mentioned mixture and 49kg ammonium persulfate microcapsules are joined in the working column under pressure. After waiting for 120 minutes, the chemical plugging plug is formed in the working string under pressure.

[0028] Experiments have measured that the pressure bearing capacity of the chemical plugging rubber plug of this embodiment is 40 MPa, and the rubber plug degrades after 7 days.

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Abstract

The invention discloses a chemical sealing rubber plug in a snubbing operation string as well as a preparation method and application of the chemical sealing rubber plug. The chemical sealing rubber plug is prepared by uniformly dispersing 1-5wt% of acrylamide, 0.5-5wt% of vegetable gelatin, 0.01-0.2wt% of azo initiator, 0.1-0.5wt% of N', N-methylene bisacrylamide and 0.1-1wt% of montmorillonoid in water, and adding 0.2-1wt% of ammonium persulfate microcapsule. The ammonium persulfate microcapsule is added when pumping the chemical sealing rubber plug to an oil tube in a use process and after the process stops for 30-120min, thus obtaining the chemical sealing rubber plug in a snubbing operation string. Maximum compression strength of the cross-linked and solidified chemical sealing rubber plug liquor can reach 40MPa under well temperature of 50-120 DEG C, and automatic degradation and gel breaking can be realized after 2-7 days.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a chemical plugging rubber plug in a pressure operation pipe string and its preparation method and application. Background technique [0002] Snubbing operation refers to the downhole operation technology that uses special workover equipment to implement pipe and rod tripping, wellbore repair and production stimulation measures under the condition of pressure at the wellhead of oil, gas, and water wells. Compared with conventional operation technology, snubbing operation technology has three advantages. One is to avoid damage to the oil and gas layers during the production process and better protect the original state of the formation; the other is to reduce the damage to the reservoir in the middle and later stages of development and better maintain the productivity of the formation; the third is to avoid the pressure relief problem of the water injection well operat...

Claims

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Application Information

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IPC IPC(8): C09K8/44C08F220/56C08F222/38E21B33/13E21B33/134
CPCC09K8/512C08F220/56E21B33/12
Inventor 周涛徐克彬杨昱王中泽屈兴华王燕声提云高飞徐昊洋
Owner CNPC BOHAI DRILLING ENG
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