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Oil-gas blocking and sealing material

A plugging material and oil and gas technology, applied in the field of oil drilling, can solve problems such as the inability to block and block oil and gas, and the lack of sensitive properties of gas

Active Publication Date: 2018-07-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the materials provided in the above-mentioned schemes have certain effects on oil and water, they lack good sensitivity to gases (especially small molecular gaseous hydrocarbons), and cannot achieve gas-triggered oil and gas blocking and plugging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 1.1 Sample preparation

[0065] Hexadecyl methacrylate, undecylenic acid, and styrene were dissolved in xylene to prepare a monomer solution with a mass concentration of 40 wt%, wherein the mass fraction of cetyl methacrylate was 30.0%, and undecyl The mass fraction of alkenoic acid is 7.0%, the mass fraction of styrene is 3.0%, and the rest is xylene. Ethylene-propylene rubber particles with a median diameter of 5 mm were swelled in a monomer solution for 6 hours in a diffusion-controlled manner to obtain a prepolymer. After adding 50wt% white carbon black to the obtained prepolymer, high-energy electron irradiation is carried out at room temperature to initiate the monomer to carry out graft polymerization reaction inside and on the surface of the rubber particle, and the irradiation intensity is 120kGy; After drying under vacuum for 12 hours at °C, it was pulverized to obtain an oil-gas blocking and plugging material with a particle size of 30-60 mesh.

[0066] 1.2...

Embodiment 2

[0075] Dissolve octadecyl acrylate, hexenoic acid, and styrene in dichloromethane to prepare a monomer solution with a mass concentration of 52.5 wt%, wherein the mass fraction of octadecyl acrylate is 45.30%, and the mass fraction of hexenoic acid The fraction is 4.35%, the mass fraction of styrene is 2.85%, and the rest is dichloromethane. Diffusion-controlled swelling of isoprene rubber particles with a median diameter of 8 mm in the monomer solution for 8 hours to obtain a prepolymer. After adding 30wt% magnesium stearate to the resulting prepolymer, Co 60 Irradiation is used to initiate the graft polymerization reaction of monomers in the interior and surface of rubber particles, and the irradiation intensity is 180kGy; after that, the product is vacuum-dried at 80°C for 8 hours, and then pulverized to obtain an oil-gas blocking seal with a particle size of 20-80 meshes. blocking material.

[0076] According to the test method of Example 1, the oil and gas sensitivity t...

Embodiment 3

[0080]Dissolve lauryl methacrylate, undecylenic acid, and styrene in benzene to prepare a monomer solution with a mass concentration of 20 wt%, wherein the mass fraction of lauryl methacrylate is 12.5%, undecylenic acid The mass fraction of acid is 4.70%, the mass fraction of styrene is 2.80%, and the rest is benzene. The butyl rubber particles with a median diameter of 2 mm were subjected to diffusion-controlled swelling in the monomer solution for 36 hours to obtain a prepolymer. After adding 80wt% silicon dioxide to the obtained prepolymer, add 0.1wt% initiator 2-hydroxyl-methylphenylpropane-1-ketone that accounts for the total amount of the system, and initiate the monomer to carry out in the inside and surface of the rubber particle The graft polymerization reaction was irradiated with an ultraviolet light source with a wavelength of 264nm, and the reaction lasted for 12 hours; after that, the product was vacuum-dried at 50°C for 12 hours, and then pulverized to obtain an...

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Abstract

The invention provides an oil-gas blocking and sealing material. The oil-gas blocking and sealing material is obtained by the following mode with the steps of: a) mixing acrylate monomer, alkyl olefine acid monomer, styrene monomer and a solvent to obtain monomer solution; b) swelling non-polar or weakly-polar rubber particles in the monomer solution to obtain prepolymer; c) mixing the prepolymerand a separating agent, and carrying out grafting polymerization reaction under the initiated polymerization condition to obtain the oil-gas blocking and sealing material. The oil-gas blocking and sealing material provided by the invention not only has excellent sensitive responding characteristic for oils, but also has sensitive responding characteristic for short-chain gaseous hydrocarbon (the number of carbon atoms is less than or equal to 4), and swells self under the triggering condition of oil or gas so as to block or seal oil-gas channels in microcracks.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to an oil and gas blocking and plugging material. Background technique [0002] At present, there is a huge demand for the development of gas wells such as natural gas and shale gas in China, and the extremely high underground oil and gas pressure makes the cementing annulus under pressure and workover under pressure often occur. A large number of oil and gas passages are easily formed at various working interfaces and micro-fractures related to the interface. These oil and gas channeling channels will bring huge damage and hidden dangers to the integrity of the wellbore after completion and the recovery and post-processing work after completion. Therefore, it is of great significance to block and block oil-gas channeling and oil-water plugging for micro-fracture oil-gas channels at the downhole interface. [0003] At present, the problem of oil-gas channeling and oil-water pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/04C08K3/04C08F255/04C08F220/18C08F220/04C08F212/08C09K8/42
CPCC08F255/04C08K3/04C09K8/426C08L51/04C08F220/1818
Inventor 徐昆谭颖王丕新张文德裴晓鹏邓裕坤翟侃侃梁学称
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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