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Polymer gel, polymer and application thereof

A technology of polymers and gels, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of gel system strength, long-term stability of plugging integrity not meeting expectations, poor plugging integrity, suspension Poor performance and other problems, to achieve good long-term stability, high plugging success rate, high viscoelastic effect

Active Publication Date: 2017-07-07
SICHUAN GUANGYA POLYMER CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Granular plugging agents are generally organic / inorganic composite water-absorbing materials, which have good water-absorbing and swelling properties, and block pore channels through the principle of bridge plugs. However, due to their poor suspension, the particles are difficult to match well with the formation pores, resulting in poor injectivity. Poor plug integrity and low success rate
Most of the existing gel-type plugging regulators are water-soluble polymers added with different cross-linking agents. Through the chemical reaction between the polar groups on the polymer macromolecular chain and the cross-linking agent, a body-shaped cross-linking product-gel is formed. However, after the gel system is injected into the formation, the strength, plugging integrity, and long-term stability of the gel system cannot reach the expected results after shearing, retention adsorption, chromatographic separation, and water invasion dilution.

Method used

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  • Polymer gel, polymer and application thereof
  • Polymer gel, polymer and application thereof
  • Polymer gel, polymer and application thereof

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preparation example Construction

[0034] The present invention has no special limitation on the preparation method of the polymer, as long as the acrylamide monomer, the unsaturated hydrophobic monomer and the functional monomer are polymerized.

[0035] The invention mixes the polymer with water, and after stirring, the polymer gel can be obtained, which can be used as a profile control leakage plugging agent and a water blocking agent. Wherein, the mass concentration of the polymer in water is 0.3%-5%. The water can be clear water, salt water or on-site sewage.

[0036] After the polymer gel is obtained, it can be used as a profile control plugging agent and a water blocking agent.

Embodiment 1

[0039] According to the types and ratios of monomers shown in Table 1, acrylamide monomers, unsaturated hydrophobic monomers and functional monomers were used as raw materials to carry out polymerization reactions to obtain the random copolymers shown in Table 1.

[0040] Table 1 Types and proportions of polymer monomers

[0041]

[0042]

Embodiment 2

[0044] In the experiment, clean water was used to dissolve the 1# polymer in a water bath at a temperature of 45°C, and the polymer mass concentration was 0.3%, to obtain a gel.

[0045] Under low-speed stirring conditions, slowly add the gel into a beaker with 500ml of clear water. Laboratory experiments show that in clear water, the gel dissolves for 2 hours at 50°C; stand still for 4 hours, on the Brookfield DV-Ⅲ viscometer The viscosity of the test gel is 25260mPa.s, the solution can be picked up, and the 1min static shear force of the gel tested on a six-speed rotary viscometer (64# rotor, 6r / min) is 21Pa; its indoor aging stability is 180d viscosity retention The rate is 73%.

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Abstract

The invention provides a polymer gel. The polymer is formed in water via physical actions such as Van der Waals' force, hydrogen bond and electrostatic action, and the acrylamide monomer unit in the polymer is a hydrophilic group, so that the polymer has good water solubility; and by introducing a hydrophobic monomer unit and a functional monomer unit, the polymer has good hydrophobic property and good temperature and salt resistance. The polymer gel is low in viscosity under high speed shear, has good injection property, and can ensure large-dose injection of a plugging control system; and the polymer gel has good shear restoration and high visco-elasticity, is stable at the frontal slug of a near borehole zone, strong in water invasion resistance, unique in overall propulsion and high in plugging success rate, can effectively change the subsequent water flooding seepage path and improve the swept volume, has good temperature and salt resistance and long-term stability, and can be used as a profile control plugging agent.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a polymer gel, a polymer and applications thereof. Background technique [0002] The research and application of profile control and plugging at home and abroad has a history of nearly 60 years. With the deepening of theoretical understanding, there are more and more types of plugging agents. my country's oilfields generally adopt the water injection development method, and the geology is complex. In the middle and later stages of development, the contradiction between layers and layers caused by stratum heterogeneity is prominent, which leads to the reduction of energy storage for water driving of water injection wells, and the reduction of water breakthrough capacity of oil wells. Injection-production control difficulty. In this regard, the oil field injects plugging agent to plug the high-permeability zone, change the direction of water flooding, increase the wate...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/54C08F222/06C08F220/18C08F216/18C08F220/34C08F220/38C08F226/02C08F226/10C08F220/58C08J3/075C09K8/035C09K8/44C08L33/26
CPCC09K8/035C09K8/44C08F220/56C08J3/075C08J2333/26C08F220/382C08F216/18C08F226/10C08F220/1818C08F220/585C08F220/1812C08F220/34C08F222/06C08F226/02
Inventor 郭拥军张新民李华兵蔡术威樊力
Owner SICHUAN GUANGYA POLYMER CHEM
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