Controllable degradable terpolymer temporary plugging agent, preparation method and use method

A technology of terpolymer and propylene carbonate terpolymer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of difficulty in uniform distribution of acid, unreachable acid solution, and poor effect of acidification transformation and other problems, to achieve the effect of high plugging strength, simple use method and good market promotion value

Active Publication Date: 2021-09-28
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of acidizing heterogeneous reservoirs, the acid liquid preferentially acidifies the reservoirs with small flow resistance and high permeability, while the reservoirs with large flow resistance and low permeability are caused by poor acid liquid entry. Its acidification transformation effect is not good
Therefore, the conventional acidizing technology can only solve the pollution and permeability problems near the wellbore area due to the violent acid-rock reaction and a large amount of acid consumption.

Method used

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  • Controllable degradable terpolymer temporary plugging agent, preparation method and use method
  • Controllable degradable terpolymer temporary plugging agent, preparation method and use method
  • Controllable degradable terpolymer temporary plugging agent, preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Pour caprolactone, 0.1% lactide and 0.1% glycolide with a mole fraction of 99.8% into a three-necked flask, and heat the oil bath to 80°C to make the three reaction monomers in a molten state. Vacuum for 15 minutes, the vacuum degree in the bottle is 1-2 Torr, and dry nitrogen gas is passed at the same time to remove the oxygen and moisture in the bottle; then add 0.01% ethylene glycol and 0.01 % stannous octoate, the oil bath was heated to 150°C, and the reaction was continued for 4h to obtain a crude product; the crude product was completely dissolved in dichloromethane, and excess ethanol was added thereto, and the upper solvent was poured off to obtain a precipitate I, which was Precipitate I was dissolved in dichloromethane again, and excess ethanol was added again, the upper solvent was poured off, the precipitate was collected, and the above dissolution-precipitation process was repeated to finally obtain precipitate II, which was vacuum-dried at room temperature ...

Embodiment 2

[0059] Pour mole fractions of 33.3% caprolactone, 33.3% lactide and 33.4% glycolide into a three-necked flask, and heat the oil bath to 80°C so that the three reaction monomers are in a molten state, and stir Vacuumize for 15 minutes, the vacuum in the bottle is 1-2 Torr, and dry nitrogen at the same time to remove the oxygen and moisture in the bottle; then add 0.5% of dipentaerythritol and 0.1 % stannous octoate, the oil bath was heated to 120°C, and the reaction was continued for 8 hours to obtain a crude product; the crude product was completely dissolved in dichloromethane, and excess ethanol was added thereto, and the upper solvent was poured off to obtain a precipitate I. Precipitate I was dissolved in dichloromethane again, and then excess ethanol was added again, the upper solvent was poured off, the precipitate was collected, and the above dissolution-precipitation process was repeated to finally obtain Precipitate II, which was vacuum-dried at room temperature for 48...

Embodiment 3

[0065] Pour mole fractions of 0.1% caprolactone, 0.1% lactide and 99.8% glycolide into a three-necked flask, and heat the oil bath to 80°C to make the three reaction monomers in a molten state, stirring Vacuumize for 15 minutes, the vacuum degree in the bottle is 1-2 Torr, and dry nitrogen at the same time to remove the oxygen and moisture in the bottle; then add 0.1% trimethylol to the three-necked flask, accounting for the total molar weight of the three reaction monomers Propane and 0.05% stannous octoate, the oil bath is warmed up to 130 ° C, and the reaction is continued for 6 hours to obtain a crude product; the crude product is completely dissolved in dichloromethane, and excess ethanol is added thereto, and the upper solvent is poured off to obtain Precipitate I, dissolve the precipitate I in dichloromethane again, then add excess ethanol again, pour off the upper solvent, collect the precipitate, repeat the above dissolution-precipitation process, finally obtain the pr...

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Abstract

The invention discloses a controllable degradable terpolymer temporary plugging agent, which comprises any three monomers in caprolactone, lactide, glycolide and polypropylene carbonate diol in any molar ratio A terpolymer formed by copolymerization. The copolymer is sequentially melted by heating the reaction monomer, adding a catalyst, or a catalyst and an initiator to initiate a copolymerization reaction, repeating precipitation-dissolution to purify the copolymerization product, and breaking into components with different particle sizes according to Proportionally formulated; when in use, the degradation time can be further adjusted by adding crystal breakers and / or degradation accelerators; the controllable degradability terpolymer temporary plugging agent has non-toxic, strong pressure, and 100% in aqueous environment Complete degradation, no residue after complete degradation, and no damage to the reservoir; at a well temperature of 80-150°C, the complete degradation time can be adjusted between 0.5h-60d; and the preparation method of the temporary plugging agent and the regulation of degradation The method of using time is simple and easy to implement, and has good marketing value.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oil and gas field exploration and development, in particular to a controllable degradable terpolymer temporary plugging agent, a preparation method and a use method. Background technique [0002] With the deepening of oil and gas field development, the construction is becoming more and more difficult, and the requirements for downhole operation technology are getting higher and higher, such as temporary plugging diversion fracturing technology, acid fracturing and uniform acid distribution technology, and oil and gas layer temporary plugging technology. Among them, the temporary plugging and diverting fracturing technology is to pump a temporary plugging and diverting agent into the target layer under certain conditions, and use the difference in permeability in the layer to change the inflow direction of the original liquid to achieve the purpose of generating new fractures. The co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/08C08G63/06C08G63/64C09K8/508
CPCC08G63/06C08G63/08C08G63/64C09K8/5086
Inventor 邹鹏张曙光胡永雄杨兴其王文山徐庆祥杨津李博刘林
Owner CNPC BOHAI DRILLING ENG
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