Temperature-sensitive expandable microcapsule anti-gas channeling agent and anti-gas channeling cement slurry system
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A technology of expanding microcapsules and anti-gas channeling agent, applied in the field of cementing cement slurry, can solve the problems of demulsification, insufficient expansion performance, inability to use, etc., and achieve the effect of making up for volume shrinkage and ensuring safety
Active Publication Date: 2019-05-10
SOUTHWEST PETROLEUM UNIV
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But existing anti-gas channeling agent has the following problems: gas-generating class anti-gas-channeling agent (such as KQ series), has the uncontrollable defective of gas generation; agent and preparation method thereof CN103834374A) the addition amount is relatively large, and demulsification will also occur when the storage temperature is low, which affects the effect of preventing gas channeling; polyvinyl alcohol cannot be used in high-temperature and high-salt environments; (Zheng Guosheng et al. Research and Application of Plastic Expansion Anti-Channeling Cement Slurry System. [J]. Petroleum Drilling and Production Technology, 2013,35(5):52-55) The main component is calcium sulfate, and the main disadvantage is insufficient expansion performance , expansion time and expansion well depth are uncontrollable
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Embodiment 1
[0028] The preparation of temperature-sensitive expansion microcapsule anti-gas channeling agent (the following materials are all parts by weight), the process is as follows:
[0029] Formula 1: 3 parts of acrylonitrile, 0.4 parts of methyl acrylate, 2 parts of methyl methacrylate, 1 part of initiator lauroyl peroxide, 10 parts of foaming agent isobutane, crosslinking agent 1,4-butanediol Dissolve 0.1 part of dimethacrylate with electromagnetic stirring, transfer to a reaction glass kettle, add 20 parts of dispersant nano-silica, 300 parts of deionized water, stir at 1200r / min for 8-10min, and react in a constant temperature water bath at 62°C under nitrogen protection After 24 hours, cool down, wash and dry.
[0030] Formula 2: 15 parts of foaming agent isobutane, the others are the same as formula 1.
[0031] Formula 3: 20 parts of blowing agent isobutane, the others are the same as formula 1.
[0032] Formula 4: 25 parts of blowing agent isobutane, the others are the same...
Embodiment 2
[0036] Embodiment 2 (the following materials are parts by weight)
[0037] Blank sample: 100 parts of oil well cement, 2 parts of dispersant, mix and stir evenly to get dry mixed material; Wet mixing material; under the stirring condition of 4000 rpm, add the dry mixing material into the wet mixing material at a uniform speed (15s), then stir at 12000 rpm for 35s and defoam, and then get the cement slurry of the comparison group system.
[0038] A kind of preparation of temperature-sensitive expansion microcapsule anti-gas channeling cement slurry system, the process is as follows:
[0039] Formula A: 100 parts of oil well cement, 0.1 part of expansion microcapsules of anti-air channeling agent, 2 parts of dispersant, mix and stir evenly to obtain a dry blend material; 1.5 parts of fluid loss reducer, 1 part of retarder, 0.2 part of defoamer Dissolve in 44 parts of water and stir evenly to obtain the wet-mixed material; under the stirring condition of 4000 rpm, add the dry-m...
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Abstract
The present invention discloses a temperature-sensitive swelling microcapsule anti-gas-channeling agent and an anti-gas-channeling cement slurry system. The temperature-sensitive expansion microcapsule anti-gas-channeling agent preparation method comprises: adding 3-4 parts of acrylonitrile, 0.4-0.5 part of methyl acrylate and 2-3 parts of methyl methacrylate to a beaker, adding 1-2 parts of lauroyl peroxide as an initiator, 10-30 parts of a low boiling point solvent as a foaming agent, and 0.1-0.2 part of 1, 4-butanediol dimethacrylate as a cross-linking agent, carrying out stirring dissolving, transferring into a glass reaction kettle, adding 20-25 parts of nano-silica as a dispersant and 300-350 parts of deionized water, carrying out a constant temperature water bath reaction for 20-24 h at a temperature of 60-70 DEG C under nitrogen protection, cooling, washing, and drying. The anti-gas-channeling cement slurry system comprises 100 parts of oil well cement, 1.5-2 parts of a fluid loss additive, 2-3 parts of a dispersant, 0.1-1 part of an anti-gas-channeling agent, 0-3 parts of a retarder, 0.2 part of a defoamer, 0-50 parts of a density adjuster, and 44 parts of water. According to the present invention, with the temperature-sensitive expansion microcapsule anti-gas-channeling agent and the anti-gas-channeling cement slurry system, the cement stone volume shrinkage can be effectively made up, the stratum fluid can be sealed, the channeling can be prevented, the occurrence of the annulus pressure phenomenon can be prevented, and the service life of the oil well can be prolonged.
Description
technical field [0001] The invention relates to a temperature-sensitive expansion microcapsule anti-gas channeling agent in the field of well cementing slurry and its application in preparing an anti-gas channeling cement slurry system. Background technique [0002] The volume shrinkage in the cement hydration process of oil wells is the main reason for the poor bonding quality of the cement annulus interface, the channeling of oil, gas and water in the well, the pollution of the oil layer, and the pressure in the annular space after production. This has not yet been well resolved. Cementing technical problems. The volume shrinkage of the cement slurry in the plastic state will reduce the pore pressure of the cement slurry column (gelation weight loss), and the volume shrinkage after solidification will cause problems in the cement sheath, the formation and the casing, forming micro-gap, 95% of the shrinkage The volume shrinkage of the cement slurry is 2.6%-5.0% of the tota...
Claims
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Application Information
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