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Oil-displacing agent for binary oil displacement and binary oil displacement mining method of oil field

The technology of oil displacement agent and auxiliary agent is applied in the field of oil displacement agent for binary oil displacement and oil field binary oil displacement, and can solve the problem of high cost of oil displacement agent, and achieves good effect, obvious effect and simple and easy-to-obtain raw materials. Effect

Active Publication Date: 2014-02-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above two oil displacement agent systems contain more than 4 kinds of components, both of which use organic solvents, which basically represent the composition characteristics of the existing three-component compound oil displacement agent. The main agent is an anionic surfactant, and the cost of the oil displacement agent is relatively low. high

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  • Oil-displacing agent for binary oil displacement and binary oil displacement mining method of oil field

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Embodiment 1

[0039] This embodiment provides a kind of oil displacement agent for binary oil displacement, which is prepared through the following steps:

[0040] 0.3g sodium polyacrylate, 0.08g polyoxyethylene sorbitan monooleate, microdispersant (ATMP, 0.001g) are dissolved with appropriate amount of Daqing oil field water to obtain a solution, and it is the NaCl aqueous solution of 20wt% to adjust the mineral content of the solution. Then dilute it with Daqing oilfield water to a total weight of 100g to obtain four oil displacement agent solutions with salinity of 5630mg / L, 10630mg / L, 15630mg / L and 25630mg / L respectively.

[0041] Oil sand deoiling experiment:

[0042] Viscosity at 45°C is 10mPa·s, d=0.8294g / cm 3 The oil sand (40-80 mesh) prepared from crude oil in Daqing Oilfield, the specific preparation steps of oil sand: mix the mass ratio of quartz sand and crude oil according to the mass ratio of 8:2, then put it into an oven and age it at a formation temperature of 45°C 192 hou...

Embodiment 2

[0044] This embodiment provides a kind of oil displacement agent for binary oil displacement, which is prepared through the following steps:

[0045] 0.3g sodium polyacrylate, 0.05g polyoxyethylene sorbitan monooleate, and microdispersant (TH904, 0.002g) were dissolved with an appropriate amount of Daqing oilfield water to obtain a solution, and the concentration was 20wt% NaCl aqueous solution to adjust the mineral content of the solution. Then dilute it with Daqing oilfield water to a total weight of 100g to obtain four oil displacement agent solutions with salinity of 5200mg / L, 10200mg / L, 15200mg / L and 25200mg / L respectively.

[0046] Oil sand deoiling experiment:

[0047] Viscosity at 45°C is 10mPa·s, d=0.8294g / cm 3 The oil sands (80-100 mesh, aged at 45°C for 192 hours) prepared from crude oil from the Daqing Oilfield were subjected to atmospheric pressure static deoiling experiments on the above four oil displacement agent solutions, and the experiments were carried out...

Embodiment 3

[0050] This embodiment provides a kind of oil displacement agent for binary oil displacement, which is prepared through the following steps:

[0051] 0.3g sodium polyacrylate, 0.05g polyoxyethylene sorbitan monooleate, microdispersant (TH904, 0.002g) are dissolved with an appropriate amount of Dagang oil field water to obtain a solution, and the concentration is 20wt% NaCl aqueous solution to adjust the mineral content of the solution. Then dilute it with Dagang oilfield water to a total weight of 100g to obtain four oil displacement agent solutions with salinity of 8700mg / L, 13700mg / L, 18700mg / L and 28700mg / L respectively.

[0052] Oil sand deoiling experiment:

[0053] At 53.6°C, the viscosity is 9.9mPa·s, d=0.8603g / cm 3 The oil sands (100-160 mesh, aged at 53.6°C for 192 hours) prepared from crude oil in the Dagang Oilfield were subjected to atmospheric pressure static deoiling experiments on the above four oil displacement agent solutions, and the experiments were carried...

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Abstract

The invention relates to an oil-displacing agent for binary oil displacement and a binary oil displacement mining method of an oil field. The oil-displacing agent for binary oil displacement comprises the following materials by weight: 0.05-0.4% of a main agent, 0.01-0.2% of assistant, 0.001-0.005% of a dispersing agent and the balance of water, wherein the main agent is acrylate polymer, and the assistant is one or combination of polyoxyethylene sorbitan organic acid ester and alkyl polysaccharide anhydride. The binary oil displacement mining method of the oil field, provided by the invention, comprises a step of carrying out oil displacement work by injecting the oil-displacing agent for binary oil displacement into an oil well, wherein before the oil displacement work, the degree of mineralization of the oil-displacing agent for binary oil displacement is adjusted to a target oil deposit value by utilizing a regulator for degree of mineralization. The oil-displacing agent for binary oil displacement, provided by the invention, has the advantages of simple and easily obtained raw materials, less amount and higher recovery efficiency, especially under a low permeability condition.

Description

technical field [0001] The invention relates to an oil displacement agent for binary oil displacement and a recovery method for binary displacement in an oil field, and belongs to the technical field of petroleum exploitation. Background technique [0002] Tertiary oil recovery technology has become one of the most important oil recovery technologies in old oilfields in my country. Due to the presence of strong alkali in the ASP flooding system, a series of post-operation problems such as scaling, corrosion, and difficult oil-water separation of the produced fluid have caused the polymer / surfactant (P / S) binary composite flooding technology to It has become one of the main technologies of tertiary oil recovery. However, the requirements for the performance of the chemical agent in the binary compound flooding system are higher, and the interfacial tension of the oil displacement agent in the alkali-free medium is required to be ultra-low (10 -3 mN / m) is difficult. In the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584E21B43/22
Inventor 张翼朱友益马德胜蔡红岩侯庆锋
Owner PETROCHINA CO LTD
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