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High-temperature foam profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof

A technology of flooding agent and steam flooding, which is applied in the direction of production fluid, wellbore/well components, drilling composition, etc. It can solve the problem of high concentration, foam agent can not meet high temperature resistance, and it is difficult to withstand above 300 °C High temperature and other problems, to achieve the effect of increasing the viscosity of the liquid film, good foam stability, and improving the sweep coefficient

Active Publication Date: 2021-05-28
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Foam agents that meet the requirements of offshore heavy oil steam flooding with injection need to withstand temperatures of 300°C to 350°C while maintaining good foam performance, while general foam agents cannot meet the requirements of high temperature resistance
Chinese patent CN107903886A discloses a foam agent for high temperature resistant auxiliary steam flooding. The foam stabilizer polyacrylamide, polyvinyl alcohol and alkanolamide in the foam agent are difficult to withstand high temperatures above 300°C, and the use concentration is relatively high, which is not suitable for For steam flooding with injection requirements

Method used

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  • High-temperature foam profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof
  • High-temperature foam profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof
  • High-temperature foam profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The mass percentage composition of raw material is as follows:

[0033] Foaming agent 1.0%, nano-modified bentonite (100-300nm particle size) 2%, sodium metaborate 0.05%, water 96.95%;

[0034] Among them, the foaming agent is long carbon chain α-olefin sulfonate sodium (C 20 ~C 24 ) and nonylphenol polyoxyethylene ether carboxylate sodium APEC-10 (in formula (1), n=10) in a mass ratio of 3:1.

[0035] Prepare as follows:

[0036] (1) Weigh 2g of nano-modified bentonite, slowly add 96.95g of water under the condition of stirring at 500r / min, increase the speed of rotation at 2000r / min and stir for 2h, so that the nano-modified bentonite is fully expanded and dispersed to form a homogeneous suspension solution, and placed for 10h spare.

[0037] (2) Add 1.0g of foaming agent and 0.05g of sodium metaborate into the nano-modified bentonite particle suspension solution obtained in step (1), and continue to stir at a stirring rate of 100r / min for 30min to obtain high-tem...

Embodiment 2

[0039] The mass percentage composition of raw material is as follows:

[0040] Foaming agent 0.8%, nano-modified bentonite (100-300nm particle size) 1.5%, sodium carbonate 0.05%, water 97.65%;

[0041] Among them, the foaming agent is long carbon chain α-olefin sulfonate sodium (C 20 ~C 24 ) and sodium nonylphenol polyoxyethylene ether carboxylate APEC-15 (in formula (1), n=15) in a mass ratio of 2:1.

[0042] Prepare as follows:

[0043] (1) Weigh 1.5g of nano-modified bentonite, slowly add 97.65g of water under 500r / min stirring condition, increase the rotating speed of 1500r / min and stir for 2h, make the nano-modified bentonite fully expand and disperse, form a homogeneous suspension solution, place 12h standby.

[0044] (2) Add 0.8g of foaming agent and 0.05g of sodium carbonate into the nano-modified bentonite particle suspension solution obtained in step (1), and continue to stir at a stirring rate of 150r / min for 20min to obtain a high-temperature foam control agent...

Embodiment 3

[0046] The mass percentage composition of raw material is as follows:

[0047] Foaming agent 0.5%, nano-modified bentonite (100-300nm particle size) 1.0%, sodium bicarbonate 0.05%, water 98.45%;

[0048] Among them, the foaming agent is long carbon chain α-olefin sulfonate sodium (C 20 ~C 24 ) and nonylphenol polyoxyethylene ether carboxylate sodium APEC-20 (in formula (1), n=20) in a mass ratio of 1:1 compound.

[0049]Prepare as follows:

[0050] (1) Weigh 1.0g of nano-modified bentonite, slowly add 98.45g of water under 500r / min stirring condition, increase the rotating speed of 1800r / min and stir for 2h, so that the nano-modified bentonite is fully expanded and dispersed to form a homogeneous suspension solution, place 8h standby.

[0051] (2) Add 0.5g foaming agent and 0.05g sodium bicarbonate to the nano-modified bentonite particle suspension solution obtained in step (1), and continue to stir at a stirring rate of 200r / min for 10min to obtain high-temperature foam c...

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Abstract

The invention discloses a high-temperature profile controlling and flooding agent for offshore thickened oil steam flooding, and application thereof. The high-temperature profile controlling and flooding agent comprises, by mass, 0.5-1% of a foaming agent, 1-2% of a nano-particle foam stabilizer, 0.01-0.05% of an interface synergist, and the balance of water. The foaming agent is a compound of an anionic surfactant and an anionic-nonionic surfactant in a mass ratio of (1-3): 1; the anionic surfactant is long-carbon-chain alpha-olefin sodium sulfonate, and the carbon chain length of the anionic surfactant is 20-24; and the anionic-nonionic surfactant is sodium nonylphenol polyoxyethylene ether carboxylate. The high-temperature foam profile controlling and flooding system has good stability at the temperature of 300-350 DEG C, the resistance factor can reach 35 or above, the high-temperature foam profile controlling and flooding system can be used for steam flooding accompanying injection, the problems of steam overlapping and steam channeling can be effectively solved, and the sweep efficiency and displacement efficiency of offshore thickened oil steam flooding can be greatly improved, so the development effect of thickened oil steam flooding thermal recovery is improved.

Description

technical field [0001] The invention relates to a high-temperature foam flooding agent for heavy oil steam flooding in the sea and its application, belonging to the technical field of oil field chemistry. Background technique [0002] Steam injection thermal recovery is currently the main way to exploit heavy oil. When the heavy oil thermal recovery block enters the multi-round huff and puff stage and switches to steam flooding, due to the heterogeneity of the formation, the difference in mobility ratio and steam overlay, etc. The influence of factors leads to the reduction of periodic oil production, the reduction of oil-steam ratio, the increase of water content, and the deterioration of economic benefits. Steam overlay and steam channeling are the main reasons for the low longitudinal and lateral steam sweeping efficiency. Research and practice at home and abroad have shown that high-temperature-resistant foam control and displacement agents can effectively solve the pro...

Claims

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Application Information

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IPC IPC(8): C09K8/592C09K8/584E21B43/24E21B43/22E21B43/01
CPCC09K8/592C09K8/584E21B43/24E21B43/16E21B43/01C09K2208/10
Inventor 郑伟谭先红谢昊君王泰超王旭东张利军白玉婷梁斌田波裴海华单景玲张贵才
Owner CNOOC TIANJIN BRANCH
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