Blocking method adopting fluid gel for producing blocking valve by formation temperature to block gas reservoir
A technology of formation temperature and gel, which is applied in sealing/seal, chemical instruments and methods, earthwork drilling and mining, etc., can solve problems such as uneven gel, high gel cost, and poor water retention performance, so as to avoid premature Low consumption, simple process, good water retention performance
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[0044] As the best implementation mode of the present invention, its method is as follows:
[0045] S1: Mix the gel cross-linking system and the gel initiator evenly without fish eyes in the solution to form a fluid solution; there are no restrictions on the device used for mixing, and any device commonly used in this field can be used, such as a stirring pump .
[0046]S2: After the fluid solution is prepared, the fluid solution is pumped into the wellbore. Under the surface temperature, the gel is not gelled, so it is easy to pump in. Pump in according to the design amount of the construction well, and the fluid reaches the required wellbore depth. Or stop the pump near the formation, because the temperature of the formation is much higher than that of the surface, when the reaction temperature of the gel initiator is reached, the copolymerization and crosslinking of the monomer and the cross-linking agent will be initiated to form a gel, which will seal the connection betwe...
Embodiment 2
[0079] As another preferred embodiment of the present invention, its components and proportioning ratio are:
[0080] 6% of acrylamide and 2% of sodium acrylate, and 0.5% of N,N'-methylenebisacrylamide, using the gel initiator azobis(dimimidylpropane) dihydrochloride (V44), the rest is For water, at 70°C, the gelling viscosity is 30,000 mPa.s after 30 minutes, and the maximum sealing pressure is 2.5MPa / 100m after gelling in a 5-inch casing. All the other are with embodiment 1. After the gel is formed, inject 2.5% ammonium persulfate breaker aqueous solution into the casing. The total amount of ammonium persulfate breaker is 1% of the total weight of the gel crosslinking system. At 70°C, break the gel after 1 hour. The apparent viscosity of the breaking liquid is 20mPa.s.
Embodiment 3
[0082] As another preferred embodiment of the present invention, its components and proportioning ratio are:
[0083] Acrylamide 8% and acryloyloxyethyltrimethylammonium chloride 2%, and N,N'-methylenebisacrylamide 0.5%, using water-soluble oxidation-reduction gel initiator potassium persulfate 0.3% and Sodium bisulfite is 0.2%, and the rest is water. At 40°C, after 40 minutes, the gelling viscosity is 20,000mPa.s. After gelling in a 5-inch casing, the maximum plugging pressure is 2.4MPa / 100m. All the other are with embodiment 1. After gelling, inject 2.0% SUN-Y100 bio-enzyme breaker solution into the casing, the total amount of SUN-Y100 bio-enzyme breaker is 1% of the total weight of the gel cross-linking system, at 40°C , After 1.5 hours, the gel is broken, and the apparent viscosity of the broken gel is 10mPa.s.
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