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Polymer, temporary plugging agent and preparation method thereof
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A technology of temporary plugging agent and polymer, applied in the field of polymer, temporary plugging agent and its preparation, can solve the problems of difficulty in breaking glue, incomplete breaking of glue, formation damage, etc., and achieve the effect of breaking glue easily
Inactive Publication Date: 2021-01-15
四川晨瑞石油化工有限责任公司 +2
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However, temporary plugging agents with higher viscosity generally have a higher degree of cross-linking, resulting in more difficult or incomplete gel breaking, remaining in the formation and causing damage to the formation
Method used
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preparation example Construction
[0038] see figure 1 , the present invention also provides a preparation method of temporary plugging agent, comprising:
[0039] S1, providing the polymer;
[0040] S2, mixing the polymer and the solvent to obtain a polymer solution; and
[0041] S3, adding the breaker and the crosslinking agent into the polymer solution.
[0042] In step S1, the polymer can be obtained by free radical polymerization of the first monomer and the second monomer under the action of an initiator.
[0043] In step S2, the polymer may be added into the solvent for stirring, so that the polymer is dissolved in the solvent, thereby obtaining the polymer solution.
[0044] In step S3, the gel breaker may be firstly added to the polymer solution to dissolve the gel breaker, and then the crosslinking agent is added to crosslink the polymer to form a gel. The solvent in which the breaker is dissolved is filled in the gel network, making the gel elastic and viscous. After the gel is gelled, the break...
Embodiment 1
[0046] The first polymer is provided, and the first polymer is obtained by free radical polymerization reaction of acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, styrene, and ammonium chloride in an aqueous solution, wherein , the molar ratio of the acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and styrene is 3:4.5:2.3:0.2, and the molecular weight of the polymer is 4,530,000.
[0047] Weigh 99g of tap water and pour it into a beaker, put it on a stand mixer, start stirring, weigh 1g of the polymer and slowly add it to tap water, dissolve for 40 minutes, stop stirring, and obtain a polymer solution with a solubility of 1%. .
[0048] Add 4ml of gel breaker and 0.6ml of crosslinking agent to the above polymer solution, stir evenly, put them in an oven at 85°C, observe the gelation, and test the viscosity with an NDJ-80 viscometer. Viscosity was measured with a Pinn capillary viscometer after the gel was hydrated.
[0049] The tempo...
Embodiment 2
[0051] Example 2 is basically the same as Example 1, except that the mass percentage of the polymer solution is 1.5%.
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Abstract
The invention relates to a polymer for preparing a temporary plugging agent; the polymer is a copolymer of a first monomer and a second monomer, wherein the first monomer is an aliphatic compound, andthe second monomer is an aromatic compound or a aromatic heterocyclic compound; the polymer can be cross-linked by means of molecular segments formed by the first monomer so as to form gel. The invention also provides the temporary plugging agent prepared from the polymer, and a preparation method of the temporary plugging agent. By introducing a rigid benzene ring structure or an aromatic heterocyclic ring structure into the polymer which can form the gel, a gel network formed by the polymer is enabled to have non-uniformity because of the introduction of the rigid structure; therefore, thegel can more easily realize gel breaking, and gel breaking also can be very rapidly realized even under the condition of higher crosslinking degree of the gel network.
Description
technical field [0001] The invention relates to the field of oil field technology, in particular to a polymer, a temporary plugging agent and a preparation method thereof. Background technique [0002] Temporary plugging agents are often used in construction operations such as workover, well killing, and plugging in oil fields. After the construction operations are completed, the temporary plugging agents are broken and discharged to resume normal production operations. The temporary plugging agent needs to have a higher viscosity to realize the plugging function during the plugging period, and it should be easier to break the gel for discharge after the plugging is completed. However, temporary plugging agents with higher viscosity generally have a higher degree of cross-linking, resulting in more difficult or incomplete gel breaking, remaining in the formation and causing damage to the formation. Contents of the invention [0003] Based on this, it is necessary to provi...
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Application Information
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