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High-strength sealing plugging agent

A sealing and high-strength technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems affecting the consolidation strength of the plugging agent and the large resistance to diffusion, etc., and achieve improved thermal stability and resistance to heat and humidity properties, acceleration of curing, and effects of reducing thermal stress

Active Publication Date: 2019-12-20
新疆艾瑞克石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after calcium oxide absorbs water, it is easy to agglomerate to form large particles, and the calcium carbonate formed with carbon dioxide coats the surface layer of calcium oxide particles, which increases the resistance of carbon dioxide to the interior of the particles, causing a large amount of carbon dioxide to stay inside the plugging agent, forming a large amount of carbon dioxide. Pores affect the consolidation strength of the plugging agent

Method used

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  • High-strength sealing plugging agent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The preparation method of modified calcium-based degassing agent is as follows:

[0025] (1) Dissolve 0.2mol magnesium nitrate, 0.1mol aluminum nitrate, 0.1mol iron nitrate, 0.2mol calcium acetate in 1500ml deionized water to obtain a transparent solution; (2) add 150ml polyethylene glycol to the transparent solution as a dispersant , put the reaction solution in a constant temperature water bath at 80°C, under the condition of mechanical stirring, slowly add a mixture of sodium carbonate and sodium hydroxide with a molar ratio of 1:2 to adjust the pH=12, the solution is in the state of white sol, and continue to stir for 30 minutes (3) After the reaction is completed, let it stand and age for 12 hours, then heat and evaporate to dryness until it becomes a paste, then wash it with alcohol in a centrifuge, dry it in an oven at 120°C, and grind it to a particle size of 120-160 mesh; (4) Grind the The powder is calcined at 800°C for 30 minutes to obtain a modified calcium-...

Embodiment 2

[0028] Fluorenyl epoxy resin (9,9-bis[(2,3-epoxypropoxy)phenyl]fluorene), epoxy resin E-51, basic phenolic resin F-51, solvent iso Propanol, coupling agent octadecyltrimethoxysilane, filler, modified calcium-based degassing agent, and curing agent are mixed according to the mass ratio of 15:10:10:30:5:20:5:5 to prepare a High-strength sealing and plugging agent. Wherein, the filler is a compound of superfine cement powder and PVA fiber in a mass ratio of 4:1. The curing agent is a mass ratio compound of benzophenone imine and 9,9 bis(4-aminophenyl)fluorene. The modified calcium-based degasser uses the degasser prepared in Example 1. The application temperature of the high-strength sealing and plugging agent is 100°C.

[0029]Inspection of consolidation strength: The prepared plugging agent consolidation body was measured for 12 hours at 80°C, 90°C, and 100°C for 12 hours at 80°C, 90°C, and 100°C without closure pressure. The compressive strength of the body varies from 40....

Embodiment 3

[0032] Fluorenyl epoxy resin (9,9-bis[(2,3-epoxypropoxy)phenyl]fluorene), epoxy resin E-51, basic phenolic resin F-51, solvent iso Propanol, coupling agent octadecyltrimethoxysilane, filler, modified calcium-based degasser, and curing agent are mixed according to the mass ratio of 20:12:12:21:5:20:5:5 to form a High-strength sealing and plugging agent. Wherein, the filler is a compound of superfine cement powder and PVA fiber in a mass ratio of 3:1. The curing agent is a mass ratio compound of benzophenone imine and 9,9 bis(4-aminophenyl)fluorene. The modified calcium-based degasser uses the degasser prepared in Example 1. The application temperature of the high-strength sealing and plugging agent is 150°C.

[0033] Inspection of consolidation strength: Measure the compressive strength of the prepared plugging agent consolidation body after curing at 130°C, 140°C, and 150°C for 12 hours at constant temperature without closing pressure. The compressive strength of the forme...

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Abstract

The invention discloses a high-strength sealing plugging agent, which comprises, by mass, 15-20% of a fluorenyl epoxy resin, 10-12% of an epoxy resin, 10-12% of an alkaline phenol formaldehyde resin,20-30% of a solvent, 4-5% of a coupling agent, 15-20% of a filler, 4-5% of a degassing agent and 4-5% of a curing agent, wherein the degassing agent is a modified calcium-based degassing agent, the fluorenyl epoxy resin is 9,9-bis[(2,3-epoxypropoxy)phenyl]fluorene, the filler is a compounding agent prepared from superfine cement powder and PVA fibers according to a mass ratio of 4:1-3:1, and the curing agent is prepared by compounding benzophenone imine and 9,9-bis(4-aminophenyl)fluorene according to a mass ratio of 1:1. According to the invention, the plugging agent can effectively plug crackand micro-crack leakage layers of oil wells, gas wells and water wells, has characteristics of good sealing property, high compressive strength, strong scouring resistance, good operability and highplugging success rate, and particularly has outstanding effect in gas well micro-crack plugging treatment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a high-strength sealing and plugging agent for effectively plugging fractured leakage layers of oil, gas and water wells. Background technique [0002] In some oil and gas reservoirs with well-developed natural fractures, due to their special accumulation conditions, a large number of fractures, dissolved pores and vugs of various sizes coexist, which is conducive to oil and gas accumulation. Generally, oil and gas wells in such formations have the characteristics of high and stable production. However, fractured reservoirs have strong heterogeneity, complex storage and seepage systems, and the loss of working fluid occurs frequently. During the workover process, once the workover fluid leaks into formation fractures, it will take a long time to discharge the intruded working fluid to restore productivity, which will affect the economic benefits of oil and g...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/44
CPCC09K8/426C09K8/44
Inventor 曾斌徐太平李栓袁发明
Owner 新疆艾瑞克石油技术有限公司
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