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Composite modifying and flooding agent

A compound technology of adjusting and flooding agent, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of under-injection of water injection wells, the water injection volume cannot reach the daily water injection volume, and the production decline of effective oil wells and well groups, etc. problems, to achieve the effect of improving the oil displacement effect, increasing the amount of water injection, and reducing the amount of injected water

Active Publication Date: 2018-10-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, low-permeability oilfields will face another problem, which is the problem of "under-injection" of water injection wells, that is, the actual water injection volume cannot reach the "daily water injection volume" set for oilfield development, so that the reservoir energy for oilfield development cannot be effectively utilized. Supply and replenishment affect the decline in production of the affected oil wells and well groups. The most effective technology is the pressure reduction and injection technology, which reduces the water injection pressure of the water injection well and increases the water injection volume.

Method used

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Embodiment 1

[0038] The invention provides a composite control and flooding agent, which comprises 20-50 parts of a surfactant-type plugging agent, 30-70 parts of a pressure-reducing and increasing injection agent, and 5 parts of a particle plugging agent in parts by weight. -20 parts; wherein, the surfactant-type blocking agent is composed of polyacrylamide, water, composite crosslinking agent, modified cyclodextrin, m-phenylenediamine, oxygen scavenger and carboxylate gemini surfactant by weight Ratio 1: (110-131): (0.05-0.12): (0.2-0.8): (0.1-0.3): (0.05-0.2): (0.3-1) ratio prepared.

[0039] The present invention utilizes three key materials for coupling regulation and displacement of surfactant-type plugging agent, pressure-reducing and increasing injection agent, and granular plugging agent to carry out an effective combination of water plugging and profile control technology and pressure-reducing and increasing-injection technology to realize water plugging and profile control, reduc...

Embodiment 2

[0041] On the basis of Example 1, the raw materials for the preparation of the surfactant-type plugging agent include polyacrylamide, composite crosslinking agent, modified cyclodextrin, m-phenylenediamine, oxygen scavenger, carboxylate gemini surfactant agent. Among them, the polyacrylamide is a widely used raw material for conventional water plugging and profile control agents. When its molecules meet the oil phase, they shrink and curl, while when they meet the water phase, their molecular chains stretch, expand and stagnate water, with good selectivity. However, since this type of polymer and the formation mainly rely on hydrogen bond adsorption, the adsorption strength is weak, and it cannot withstand the erosion of water. In addition, the formation water has a high degree of salinity, and the polyacrylamide has a weak anti-salt effect, and the salt neutralizes the polyacrylamide group. The charge on the polyacrylamide ion group is shielded, the electrostatic repulsion be...

Embodiment 3

[0047] On the basis of embodiment 2, described carboxylate gemini surfactant comprises carboxylate gemini surfactant A and carboxylate gemini surfactant B, and described carboxylate gemini surfactant A consists of 1,3 - propane sultone, absolute ethanol, p-phenylenediamine, methanol, anhydrous potassium carbonate, bromododecane, acetone by weight ratio 1: (4-8): (0.3-0.7): (8- 12): (1-1.3): (0.8-1.2): (3-6) ratio prepared; the preparation method of the carboxylate gemini surfactant A comprises the following steps: first add Stir the formulated amount of 1,3-propane sultone, absolute ethanol, and p-phenylenediamine, heat up to 55-60°C, keep the temperature for 20-25 hours, and concentrate to dryness under reduced pressure; then add the formulated amount of methanol in sequence , anhydrous potassium carbonate, bromododecane, heated up to 60-70°C, kept warm for 30-35h, filtered, and the filtrate was concentrated to dryness under reduced pressure; finally, recrystallization was ca...

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Abstract

The invention provides a composite modifying and flooding agent. The composite modifying and flooding agent comprises 20-50 parts of a surfactant-type plugging agent, 30-70 parts of a decompression and augmented injection agent and 5-20 parts of a particle blocking agent. The surfactant-type plugging agent is prepared from polyacrylamide, water, a composite crosslinking agent, modified cyclodextrin, m-phenylenediamine, an oxygen scavenger and a carboxylate dimeric surfactant according to a weight ratio of 1: (110-131): (0.05-0.12): (0.2-0.8): (0.1-0.3): (0.05-0.2): (0.3-1). The surfactant-typeplugging agent, the decompression and augmented injection agent and the particle blocking agent are coupling and flooding key materials. Through the combination of a water shut-off and profile control technology and a decompression and augmented injection technology, the water shut-off and profile control, decompression and augmented injection, and oil displacement are effectively unified.

Description

technical field [0001] The invention relates to the technical fields of profile control, depressurization and injection enhancement and oil displacement used in oil exploitation, and in particular relates to a composite control and displacement agent. Background technique [0002] Low-permeability oilfields refer to oilfields with low permeability, low abundance and low single-well productivity. Low-permeability oil and gas fields are of great significance in my country's oil and gas development. The distribution of low-permeability oil and gas resources in my country has the characteristics of rich oil and gas, various types of oil and gas reservoirs, and wide distribution areas. Among the proven reserves, the proportion of low-permeability oil reserves is very high, accounting for more than 2 / 3 of the national reserves, and the development potential is huge. [0003] In the development process of low-permeability oilfields, water flooding is the most successful and economi...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/514
CPCC09K8/5045C09K8/5083C09K8/512C09K8/514
Inventor 高燕张冕兰建平李泽锋王亚军邵秀丽王改红宇文昔涵齐加德李志杰杨敏高红平
Owner BC P INC CHINA NAT PETROLEUM CORP
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