Temperature-sensitive plugging colloid for oil and gas fields, preparation method and use method thereof

Abstract

The invention discloses a temperature-sensitive plugging colloid for oil and gas fields, a preparation method and a use method thereof, wherein the plugging colloid comprises, by weight, 55-75 parts of modified polyacrylamide, 10-25 parts of a trivalent cross-linking agent, 5-20 parts of a water-soluble slow-release agent, and 45-65 parts of a water phase. According to the present invention, the modified polyacrylamide, the trivalent cross-linking agent, the water-soluble slow-release agent and the water phase are subjected to multi-phase physical adsorption and chemical pre-cross-linking wrapping granulation to obtain the product, such that the prepared temperature-sensitive plugging colloid has the delayed slow release and controllable cross-linking characteristics of temperature-sensitive swelling and temperature-controlled cross-linking, meets the intellectualization design requirement, has characteristics of low-temperature delayed adhesion and medium-high temperature control cross-linking, has characteristics of high strength and unblocking resistance after cross-linking, and has good theoretical research and practical value in the comprehensive treatment of leakage layers with a well temperature of 60-90 DEG C.

Description

technical field [0001] The invention belongs to the technical field of plugging agents for oil and gas fields, and in particular relates to a temperature-sensitive plugging colloid for oil and gas fields and its preparation and use methods. Background technique [0002] Lost circulation is an important factor that increases the cost of drilling. Traditional plugging materials and methods (such as bridge plugging, cement slurry plugging) have their own weaknesses when dealing with fissures and porosity. It is difficult to stay in the leaking layer around the wellbore, and it is easy to mix with the formation fluid and be washed away after being diluted. Therefore, it is difficult for the plugging slurry to form a sealing zone of sufficient strength around the wellbore. Polymer gel and cross-linked polymer plugging materials can better overcome the above-mentioned difficulties, but the current polymer materials are still insufficient in plugging, and the uncross-linked polymer...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a temperature-sensitive plugging colloid for oil and gas fields and its preparation and use method, which overcomes the problems in the prior art 1: bridge plugging, cement slurry plugging, etc. In the case of pertinent or porous malignant leakage, it is difficult to stay in the leaking layer around the wellbore, and it is easy to mix with the formation fluid and be washed away after being diluted. Therefore, it is difficult for the plugging slurry to form a sealing zone of sufficient strength around the wellbore; 2: The uncrosslinked polymer solution is easily mixed with the formation fluid when it is sheared by the drill bit and enters the leakage zone. Most polymer materials need to be crosslinked to achieve the purpose of plugging, and some polymers need to be injected with mud cake before plugging Scavenger eliminates mud cake; 3: The current polymer gel plugging materials have problems such as uncontrollable crosslinking time and gel strength, complicated construction process and high cost of plugging

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