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Polymer with selective water plugging function as well as preparation method and application of polymer

A polymer and selective technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor selectivity, lower oil phase permeability, low liquid, etc., and achieve excellent temperature and salt resistance and expansion properties, reduce water phase permeability, and increase the effect of water phase plugging

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, most of the selective plugging agents used in oil well water plugging are water-soluble polymers such as polyacrylamide and its derivatives to generate gel or jelly in the formation to plug the formation water, or use oil-based plugging agents. However, due to its poor selectivity, it will greatly reduce the oil phase permeability while blocking water, resulting in low liquid after plugging, which restricts the application of oil well water plugging technology

Method used

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  • Polymer with selective water plugging function as well as preparation method and application of polymer
  • Polymer with selective water plugging function as well as preparation method and application of polymer
  • Polymer with selective water plugging function as well as preparation method and application of polymer

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specific Embodiment approach

[0058] According to a preferred embodiment, the preparation method of the polymer with selective water blocking function comprises the following steps:

[0059] Step 1: adding monomer D, monomer E and monomer F into a polymerization reaction bottle to prepare an aqueous solution, and adjusting the pH value of the aqueous solution to 6-10 with alkali;

[0060] Step 2: Add chelating agent, crosslinking agent and tetramethylethylenediamine to the aqueous solution of step 1, and stir evenly;

[0061] Step 3: After bubbling nitrogen gas for 5-60 minutes at a temperature of 0-30°C, add an initiator to the aqueous solution in step 2, and after bubbling nitrogen gas to make it evenly mixed, seal polymerization for 2-15 hours to obtain a polymer colloid;

[0062] Step 4: Take out the colloid and then granulate, dry, pulverize, and sieve to obtain a polymer product with selective water blocking function.

[0063] third aspect , the present invention provides the polymer with selective...

Embodiment 1

[0076] Example 1: Preparation of a polymer with selective water blocking function

[0077] 1. 14.0g acrylamide (accounting for 70% by weight of the total amount of monomers), 2.0g of 2-acrylamido-2-methylpropanesulfonic acid represented by formula (11) (accounting for 10% by weight of the total amount of monomers) % by weight) and 4.0g of zwitterionic monomers shown in formula (12) (wherein, n=1, accounting for 20% by weight of the total amount of monomers) are added in the insulation polymerization reaction bottle (i.e. polymerization bottle), add Dissolve 60.0g of ionized water to form an aqueous solution, then add sodium hydroxide to adjust the pH to 7.0;

[0078] 2. Add 1.0 g of 1% by weight EDTA-2Na aqueous solution, 10 mg of N,N'-methylenebisacrylamide, and 10.0 mg of tetramethylethylenediamine in sequence, and stir evenly;

[0079] 3. Control the temperature of the aqueous solution at 5°C, and then add 2.0 g of 0.2% by weight potassium persulfate aqueous solution and 2...

Embodiment 2

[0082] Example 2: Preparation of a polymer with selective water blocking function

[0083] 1. 13.0g acrylamide (accounting for 65% by weight of the total amount of monomers), 4.0g of 2-acrylamido-2-methylpropanesulfonic acid represented by formula (11) (accounting for 20% by weight of the total amount of monomers) % by weight) and 3.0g of zwitterionic monomers shown in formula (12) (wherein, n=2, accounting for 15% by weight of the total amount of monomers) are added in the insulation polymerization reaction bottle (i.e. polymerization bottle), add to Dissolve 60.0g of ionized water to form an aqueous solution, then add sodium hydroxide to adjust the pH to 6.5;

[0084] 2. Add 1.0 g of 1% by weight EDTA-2Na aqueous solution, 4.0 mg of N,N'-methylenebisacrylamide, and 10.0 mg of tetramethylethylenediamine in sequence, and stir evenly;

[0085] 3. Control the temperature of the aqueous solution at 0° C., and then add 3.0 g of 0.2% by weight potassium persulfate aqueous solution...

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Abstract

The invention relates to the field of crude oil recovery and discloses a polymer with a selective water plugging function as well as a preparation method and application of the polymer. The polymer comprises a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit with a structure shown by a formula (1); the structural unit B is a structural unit with a structure shown by a formula (2); the structural unit C is a structural unit with a structure shown by a formula (3). The polymer disclosed by the invention has a high-selectivity water plugging function; by adopting a water plugging material formed by the polymer, an effect of plugging water rather than oil can be obtained with high selectivity; moreover, the polymer disclosed bythe invention has high heat resistance and salt tolerance and expansibility, and thus can reduce the water phase permeability and enhance the water phase plugging effect. The formula (1), the formula(2) and the formula (3) are shown in the description.

Description

technical field [0001] The invention relates to the field of crude oil recovery, in particular to a polymer with selective water shutoff function, a method for preparing a polymer with selective water shutoff function and a selective water shutoff polymer prepared by the method. Functional polymers and polymers with selective water shutoff function are used as selective water shutoff agents. Background technique [0002] Polymer water shutoff agents are currently widely used water shutoff agents, mainly divided into polymer relative permeability regulators (also known as phase permeability regulators) and polymer gel water shutoff agents. The main difference between the two is that the interpenetration modifier is mainly a long-chain polymer molecule, relying on the polymer molecular chain to stretch in the water phase and shrink in the oil phase, forming a dragging effect on the water phase and reducing the water phase penetration rate, the system will not cause physical p...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/38C08F222/38C09K8/575
CPCC08F220/56C09K8/5756C08F220/585C08F220/385C08F222/385
Inventor 赵方园杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP