Chemical additive for improving recovery ratio of high-deep thickened oil CO2 gas flooding process

A technology of chemical additives and oil recovery, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult oil recovery, unsatisfactory results, and viscous crude oil, etc., to achieve enhanced heavy oil recovery, Good solubilization and viscosity reduction properties, the effect of reducing the viscosity of heavy oil

Active Publication Date: 2018-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on these factors, the development of deep heavy oil has always been a problem that plagues oil production. Crude oil is viscous and has poor fluidity, and the flow near the bottom of the well and the well wall is very poor, which brings many difficulties to oil produ

Method used

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  • Chemical additive for improving recovery ratio of high-deep thickened oil CO2 gas flooding process
  • Chemical additive for improving recovery ratio of high-deep thickened oil CO2 gas flooding process
  • Chemical additive for improving recovery ratio of high-deep thickened oil CO2 gas flooding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 prepares chemical additive and measures its viscosity-reducing performance

[0019] The chemical additive is composed of a solubilizer propyl p-methoxybenzoate and a viscosity reducer lauryl methacrylate-styrene-vinyl acetate copolymer, and the mass ratio of the two is 4:1. Add the solubilizer and the viscosity reducer into the beaker, stir at room temperature for more than 1 hour to make them fully mixed, and then the chemical additives are obtained.

[0020] The preparation method of the viscosity reducer lauryl methacrylate-styrene-vinyl acetate copolymer is as follows: in a 150ml three-necked bottle equipped with a mechanical stirrer and a condenser tube, add 80ml of toluene as a solvent, and then add total The amount is 10g, and the molar ratio is 10:8:1 methyl methacrylate, styrene and vinyl acetate, and the initiator azobisisobutyronitrile of 5% of the total weight of raw materials, generally N 2 After replacing the air in the bottle, stir and reflu...

Embodiment 2

[0026] Embodiment 2 tests chemical additive to promote CO 2 Solubility in heavy oil

[0027] Devices used such as figure 1 Shown, used chemical additive is consistent with embodiment 1. The airtightness of the instrument needs to be checked before the experiment, and CO is introduced into the autoclave 2 , kept at 25MPa for 2h, if the pressure fluctuation does not exceed 1%, it can be considered that the airtightness is good. During the experiment, first weigh 25g of heavy oil in the balance kettle, turn on the CO 2 Injection valve and gas phase sampling valve, with 100 ~ 200ml / min of CO 2Air purging for 10 minutes, the air in the kettle was exhausted, and then all valves were closed. Turn on the constant temperature water bath, increase the pressure to 15MPa, stir and balance for more than 1 hour to achieve gas-liquid equilibrium. After that, slightly open the liquid phase sampling valve, take out about 20mg of liquid phase sample, and measure the amount of released gas...

Embodiment 3

[0030] Embodiment 3 prepares chemical additive and measures its performance

[0031] The chemical additive is composed of a solubilizer propyl p-methoxybenzoate and a viscosity reducer stearyl methacrylate-styrene-vinyl acetate copolymer, and the mass ratio of the two is 4:1. Add the solubilizer and the viscosity reducer into the beaker, stir at room temperature for more than 1 hour to make them fully mixed, and then the chemical additives are obtained.

[0032] The preparation method of the viscosity reducer stearyl methacrylate-styrene-vinyl acetate copolymer is as follows: in a 150ml three-necked bottle equipped with a mechanical stirrer and a condenser tube, add 80ml of toluene as a solvent, and then add total The amount is 10g, and the molar ratio is 10:8:1 methyl methacrylate, styrene and vinyl acetate, and the initiator azobisisobutyronitrile of 5% of the total weight of raw materials, generally N 2 After replacing the air in the bottle, stir and reflux at 70°C for 8 h...

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Abstract

The invention discloses a chemical additive for improving the recovery ratio of a high-deep thickened oil CO2 gas flooding process. The chemical additive consists of a solubilizer and a viscosity reducer, and the weight ratio of the solubilizer to the viscosity reducer is (1-6):1, wherein wherein the solubilizer is a p-methyl benzoate compound and the viscosity reducer is a long-chain methacrylate-styrene-vinyl acetate copolymer. The chemical additive disclosed by the invention not only can enhance the capacity of CO2 of dissolving in thickened oil, reduce the minimum mixed-phase pressure between the thickened oil and the CO2, and form CO2 mixed-phase displacement, but also can greatly reduce the viscosity of the thickened oil, and improve the flowing property of the thickened oil, so thatthe recovery ratio of the thickened oil can be improved. The chemical additive has the advantages of high efficiency, high economical efficiency, low energy consumption and the like, and is especially suitable for high-deep low-permeability reservoirs with high formation pressure, high crude oil viscosity and low permeability, and has a wide application prospect.

Description

technical field [0001] The invention relates to a method for improving deep heavy oil CO 2 Chemical additives for recovery during gas flooding to enhance CO 2 The ability to be miscible in heavy oil and reduce the viscosity of heavy oil belongs to the technical field of oil field development. Background technique [0002] Deep heavy oil refers to heavy oil reservoirs with a large burial depth (900-1300m). Compared with general shallow heavy oil, deep heavy oil not only has the characteristics of high viscosity and poor underground fluidity, but also has the characteristics of reservoir High steam injection pressure at deep burial, large heat loss of steam injection, thin oil layer, strong reservoir sensitivity, loose cementation, and difficulty in selecting development methods are unfavorable factors for production, which belong to hard-to-recover heavy oil. Based on these factors, the development of deep heavy oil has always been a problem that plagues oil production. Cru...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/588
CPCC09K8/588C09K8/594
Inventor 孙业恒许坚吴光焕王胜邓宏伟孙宝泉贾丽华张以根张礼臻于春磊隋永婷李培伦
Owner CHINA PETROLEUM & CHEM CORP
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