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Efficient self-healing agent for ultrahigh-temperature oil well cement based on crack response and application threof

An oil well cement and ultra-high temperature technology, which is applied in the field of oil drilling and cementing, can solve problems such as mechanical defects, low resin strength, and poor temperature resistance, and achieve the effects of small environmental dependence, small mechanical properties, and improved mechanical properties

Active Publication Date: 2020-03-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used resin has poor temperature resistance, and the strength of the expanded resin is low, and the poor adhesion to the cement matrix is ​​easy to form mechanical defects
Osmotic crystallization self-repair usually uses the crystal expansion reaction of minerals and water or the secondary hydration of cement to heal the cracks in the cement, but the repair process is slow, the efficiency is low, and the presence of water is necessary. The above methods are dependent on the environment. sex big

Method used

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  • Efficient self-healing agent for ultrahigh-temperature oil well cement based on crack response and application threof
  • Efficient self-healing agent for ultrahigh-temperature oil well cement based on crack response and application threof
  • Efficient self-healing agent for ultrahigh-temperature oil well cement based on crack response and application threof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Microencapsulated epoxy resins are prepared by:

[0027] Under stirring at 250r / min, add 20g of epoxy resin E44 and 20g of n-butyl glycidyl ether to 100g of distilled water, stir evenly; add 0.2g of Tween 60 and 1g of sodium dodecylbenzenesulfonate, stir and mix well, Obtain emulsion, under nitrogen atmosphere, put 24g styrene and 3g divinylbenzene into described emulsion, mix, be warming up to 60 ℃, add the benzoyl peroxide equivalent to epoxy resin E44 quality 0.5%, Raise the temperature to 80° C., react for 1 h; wash with acetone twice, deionized water twice, filter with suction, and dry to obtain a microencapsulated epoxy resin.

Embodiment 2

[0029] A high-efficiency self-healing agent for ultra-high temperature oil well cement based on fracture response, including microencapsulated epoxy resin (prepared in Example 1) and dicyandiamide with a mass ratio of 6:0.4.

[0030] The application of present embodiment self-healing agent:

[0031] Add 2%, 4%, and 6% self-healing agents of Jiahua G-grade oil well cement to 500g Jiahua G-grade oil well cement powder respectively, add water according to the water-cement mass ratio of 0.44, mix the slurry evenly, and then maintain it for 7 days to obtain cement blocks compressive strength see image 3 before the repair. Cracks were obtained by pre-compressing with 80% force, and then cured at 150°C (ultra-high temperature) for 7 hours to repair the cracks. See the compressive strength after repairing with different amounts of self-healing agent image 3 after repair.

Embodiment 3

[0033] Microencapsulated epoxy resins are prepared by:

[0034] Stir at 150r / min, 250r / min, and 350r / min respectively, add 30g of epoxy resin E51 and 35g of benzyl alcohol into 100g of distilled water, stir well; add 0.6g of Span 80 and 1.8g of dodecylsulfuric acid Sodium, stirred and mixed to obtain an emulsion, under a nitrogen atmosphere, put 38g of styrene and 4.8g of divinylbenzene into the emulsion, mixed, heated to 60°C, and added 1% by mass of epoxy resin E51 benzoyl peroxide, heated to 70°C, and reacted for 3 hours; washed with acetone twice, deionized water twice, suction filtered, and dried to obtain microencapsulated epoxy resin, see figure 1 .

[0035] figure 1 For the optical micrograph of the microencapsulated epoxy resin prepared in this embodiment 1, under the conditions of 150r / min, 250r / min, and 350r / min respectively at the stirring speed, the microencapsulated epoxy resin obtained is respectively figure 1 a. figure 1 b and figure 1 c, by figure 1 It c...

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Abstract

The invention discloses an efficient self-healing agent for ultrahigh-temperature oil well cement based on crack response and application thereof. The self-healing agent comprises microencapsulated epoxy resin and a curing agent. The microencapsulated epoxy resin is prepared by the following method: adding epoxy resin and a diluent into distilled water under stirring and stirring; and adding an emulsifier and a surfactant, stirring to obtain an emulsion, putting styrene and divinyl benzene into the emulsion in the presence of nitrogen, uniformly mixing, heating, adding benzoyl peroxide, heating and reacting to obtain the microencapsulated epoxy resin. The self-healing agent realizes self-healing of the oil well cement in an ultrahigh-temperature environment. The self-healing agent is low in dependence on the external environment, and cracks can be repaired in time when oil, gas and water channeling does not occur, internal tiny cracks can be repaired in time and the cracks can be restrained in the initial stage. The self-healing agent has little influence on the mechanical properties of a cement matrix and can improve the mechanical properties of cement after repair without causingmechanical defects or adverse effects on other cement admixtures.

Description

technical field [0001] The invention relates to high-efficiency self-healing and application of ultra-high temperature oil well cement based on fracture response, and belongs to the field of petroleum drilling and cementing. Background technique [0002] During the exploitation of oil and gas resources, the cement sheath plays a role in supporting the protective casing, restricting the movement of fluid between formations, and isolating the producing and unproducing areas. They are therefore required to withstand high pressures during their lifetime while resisting the attack of corrosive fluids encountered in the application. How to avoid cement cracking and ensure its structural and functional integrity is the key to prolonging the life of the cement sheath. Due to the particularity of the environment, it is difficult to detect or manually repair fractures during oil well operations, so self-repair technology is extremely important. [0003] At present, the research on t...

Claims

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Application Information

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IPC IPC(8): C04B24/28C04B20/02
CPCC04B20/0024C04B40/0039C04B24/281C04B24/125C04B24/121C04B24/04
Inventor 郭锦棠胡苗苗李鹏鹏刘明于永金张华张弛任相魁闫熙博
Owner TIANJIN UNIV
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