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Preparation method of downhole oil tube sealing daub

A sealant, oil pipe technology, applied in the direction of adhesive types, amide/imide polymer adhesives, adhesive additives, etc., can solve the problems of low strength, affecting sealing performance, poor heat resistance, etc. The effect of gel forming density, reducing water loss and improving emulsifying performance

Inactive Publication Date: 2019-07-12
谭孝花
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide a downhole oil pipe seal for the defects that when the cement is applied to the threaded connection of the downhole oil pipe as a sealing material, the strength is low, the heat resistance is poor, and it is easy to lose water and crack to affect the sealing performance. The preparation method of cement

Method used

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Examples

Experimental program
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preparation example Construction

[0029] Preparation of soap-free emulsion: Methyl methacrylate and styrene are mixed in a mass ratio of 2:3 to obtain a mixed monomer. In parts by weight, 40 parts of a mixed monomer, 5 parts of a 30% mass fraction Sodium hydroxide solution and 30 parts of deionized water were added to a three-necked flask with a stirrer and a ventilation tube, heated to 75°C, nitrogen gas was introduced, the agitator was started, and the stirrer was stirred at a speed of 200r / min, and 1 part potassium thiosulfate, reacted for 1.5h to obtain monomer emulsion;

[0030] In parts by weight, after the above-mentioned three-necked flask was cooled to 68°C, 30 parts of butyl acrylate, 20 parts of methyl methacrylate, 2 parts of potassium thiosulfate, and 20 parts of carbonic acid with a mass fraction of 25% were added to the three-necked flask. Sodium solution, 3 parts of sodium lauryl sulfate, stirred and reacted for 3 hours, heated up to 80°C, kept for 30 minutes, cooled down to room temperature na...

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Abstract

The invention discloses a preparation method of downhole oil tube sealing daub and belongs to the technical field of daub. Coconut oil and ethylene glycol butyl ether react under the alkaline condition to obtain fatty acid salt, the emulsification performance of the daub is improved, the fatty acid salt can replace part of inorganic salt, and influence of underground mud with high degree of mineralization is reduced. After soap-free emulsion latex forms a film, an emulsion does not contain an emulsifier and a hydrophilic group is joined to the surface of latex particles in a chemical bond form, so that the water resistance and the cohesiveness of the soap-free latex film are improved. In the preparation method, a modified substance of a water-reducing high polymer is sodium silicate, the pH value of the polymer is controlled, the hydrolysis speed of the polymer is reduced, a physical crosslinking point of a copolymer is formed, the strength of the polymer is enhanced, the high-temperature resistance of the polymer is improved, the microstructure of plastic slurry and daub stone is improved, water loss is reduced, the compactness after curing of daub is increased, the permeability of the daub is reduced, and the application prospect is broad.

Description

technical field [0001] The invention discloses a preparation method of downhole oil pipe sealing mastic, which belongs to the technical field of mastic. Background technique [0002] Clay is a muddy plastic solid with strong adhesive properties. This type of plastic solid is generally composed of solid or liquid adhesives with adhesive properties and powder fillers with certain functions. Appropriate pigments and Accessories. Most of them play a sealing role. [0003] At present, the water accumulation at the bottom of the ship's internal tank, the upper vertical water accumulation, the water longitudinal seam, and the water accumulation under the drain head of the drainage system are prone to corrosion due to frequent contact with fresh water, sea water, and oil pollution, and are prone to collision and friction. and defaced. Cement mortar is usually used for treatment. Although it can play a certain role, the overall effect is not obvious. After a period of use, crackin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/26C09J133/08C09J103/02C09J11/04C08F220/56C08F220/58C08F220/18C08F220/14C08F212/08
CPCC08F220/18C08F220/1804C08F220/56C08L2205/03C09J11/04C09J133/26C08L33/08C08L3/02C08K3/34C08F220/585C08F220/14C08F212/08
Inventor 谭孝花
Owner 谭孝花
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