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Rubber plug for stabilizing well wall of limestone deep well and preparation method thereof

A well wall stability and rubber plug technology, which is applied to chemical instruments and methods, adhesives, epoxy resin glue, etc., can solve the problems of short gelation time of liquid rubber plugs, early gelation and curing, unfavorable deep well operations, etc., to achieve solidification Controllable time, good toughness, and long effective period of operation

Inactive Publication Date: 2019-06-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gelation time of the liquid rubber plug in this patent document is too short, which may lead to gelation and solidification in advance during the injection process of the rubber plug, which is not conducive to deep well operations

Method used

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  • Rubber plug for stabilizing well wall of limestone deep well and preparation method thereof
  • Rubber plug for stabilizing well wall of limestone deep well and preparation method thereof
  • Rubber plug for stabilizing well wall of limestone deep well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 20g of butyl glycidyl ether was added to 100g of epoxy resin, and after stirring uniformly, 25g of diaminodiphenyl sulfone and 3g of titanate coupling agent were added to the above system and stirred at 70°C for 0.5h after stirring uniformly. The prepared liquid was placed under a high-speed mixer with a stirring speed of 200 r / min, and 2 g of modifier microsilica powder was weighed and slowly added to the prepared liquid and stirred for 20 min. That is, the high-strength well-wall-stabilizing rubber plug of the present invention is obtained. It was placed in a sample bottle and sealed, placed in a constant temperature oil bath at 100°C, aged for 30h, the volume shrinkage was less than 1%, and the formed cured product had high strength and good adhesion.

[0060] Wellbore Stability Simulation Test:

[0061] The cementing ability of the high-strength resin rubber plug provided in this example to rock debris was investigated. The specific implementation process is as fo...

Embodiment 2

[0063] First add 20g of butyl glycidyl ether to 100g of epoxy resin, stir evenly, add 25g of diaminodiphenyl sulfone and 3g of titanate coupling agent to the above system, stir at 70°C for 0.5h and stir evenly . The prepared liquid was placed under a high-speed mixer with a stirring speed of 200 r / min, and 2 g of nano-calcium carbonate particles were weighed and slowly added to the prepared liquid and stirred for 20 min. That is, the high-strength well-wall-stabilizing rubber plug of the present invention is obtained. It was placed in a sample bottle and sealed, placed in a constant temperature oil bath at 130°C, aged for 30h, the volume shrinkage was less than 1%, and the formed cured product had high strength and good adhesion.

[0064] Wellbore Stability Simulation Test:

[0065] The cementing ability of the high-strength resin rubber plug provided in this example to rock debris was investigated. The specific implementation process is as follows: put an appropriate amoun...

Embodiment 3

[0067] First add 20g of butyl glycidyl ether to 100g of epoxy resin, stir evenly, add 25g of diaminodiphenyl sulfone and 3g of titanate coupling agent to the above system, stir at 70°C for 0.5h and stir evenly . The prepared liquid was placed under a high-speed mixer with a stirring speed of 200 r / min, and 2 g of fumed silica was weighed and slowly added to the prepared liquid and stirred for 20 min. That is, the high-strength well-wall-stabilizing rubber plug of the present invention is obtained. It was placed in a sample bottle and sealed, placed in a constant temperature oil bath at 150°C, aged for 30h, the volume shrinkage was less than 1%, and the formed cured product had high strength and good adhesion.

[0068] Wellbore Stability Simulation Test:

[0069] The cementing ability of the high-strength resin rubber plug provided in this example to rock debris was investigated. The specific implementation process is as follows: put an appropriate amount of limestone rock f...

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Abstract

The invention relates to a rubber plug for stabilizing a well wall of a limestone deep well and a preparation method thereof. The rubber plug is prepared from raw materials of epoxy resin, diluents, curing agents, modifying agents and coupling agents; the diluents account for 20 to 30 mass percent of the resin; the curing agents account for 15 to 40 mass percent of the resin; the modifying agentsaccount for 2 to 3 mass percent of the resin; the coupling agents account for 1 to 5 mass percent of the resin. The rubber plug provided by the invention is adjustable at the temperature of 100 to 150DEG C within 4 to 9 hours; the high pressure-resistant intensity and the well wall stabilizing effects are achieved; the long-time stability is high; the rubber plug is applicable to the well wall stabilizing operation of well wall collapse wells.

Description

Technical field: [0001] The invention relates to a high-temperature-resistant and high-strength limestone deep well wall-stabilizing rubber plug and a preparation method thereof, belonging to the technical field of oilfield chemistry. Background technique: [0002] During the drilling process, the open-hole completion sections of Tahe Oilfield and Tuha Oilfield in western my country have broken strata that are easy to collapse, and frequent tripping encounters obstacles, which seriously affects drilling and causes serious collapse. The well section will lead to problems such as reaming, sticking, sticking in electrical testing, and plugging in cementing. Due to the complex causes of wellbore instability and many influencing factors, it has become a technical problem that has not been completely solved in drilling and completion projects at home and abroad. After the wellbore instability occurs, the determination of the workover and consolidation wellbore plan and the quality...

Claims

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Application Information

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IPC IPC(8): C09J163/00C09J11/04C09J11/06C08G59/50C09K8/50C09K8/44
Inventor 葛际江李鹏郭洪宾吴千慧吴昊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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