Oil-field largest swept volume chemical-flooding oil production method

A chemical flooding, the largest technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of shortening crude oil production time, long water flooding development time, and reducing oil production cost, so as to achieve low cost, free The effect of using polymer and alkali and short operation period

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AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a new method of maximum swept volume chemical flooding oil recovery in an oil field. Changing the oil field development sequence needs to go through primary oil recovery, secondary oil recovery, and finally enter the traditional method of tertiary oil recovery. The most suitable timing for injecting chemical agents is namely Inject surfactants or add a small amount of additives to enhance oil recovery at the maximum swept volume to improve oil washing efficiency and maximize oil recovery, reduce the type and amount of chemical agents used, greatly reduce oil recovery costs, and greatly shorten crude oil recovery. production time, to maximize oil production; to overcome the existing oil field development method after water flooding oil recovery, most of the crude oil still remains in the ground; Cause water channeling and large channels, making subsequent oil recovery extremely difficult, etc.

Method used

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  • Oil-field largest swept volume chemical-flooding oil production method
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  • Oil-field largest swept volume chemical-flooding oil production method

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Embodiment 1

[0064] Embodiment 1: Using the natural rock core of Changqing Oilfield, adopting the reservoir conditions such as crude oil, formation water, temperature, crude oil saturation of Changqing Oilfield, using the maximum sweep volume chemical flooding recovery method, to carry out indoor physical simulation oil displacement test as an example, The invention is described in further detail.

[0065] A. Changqing Oilfield has not been developed for a long time. There are many newly added geological reserves every year, as well as newly drilled oil production wells and new development blocks. The new blocks are very suitable for the use of maximum swept volume chemical flooding. These new blocks are sandstones with low permeability, all of which can be developed by water flooding but have not yet been developed by water flooding. Firstly, the energy of the reservoir formation itself is used for oil recovery by swabbing. When the oil field for oil extraction by swabbing reaches the eco...

Embodiment 2

[0081] Example 2: In the initial stage of a certain oil reservoir exploitation, the self-spraying oil production is carried out by using the energy of the reservoir formation itself. When no oil is produced by the self-spraying oil production, the self-spraying oil production is terminated, and the conventional water flooding oil recovery is not carried out, but directly Enhanced oil recovery by flooding with injected surfactant solution.

[0082] The injected surfactant used is: a surfactant with emulsifying properties (water-in-oil or oil-in-water emulsification), specifically nonylphenol polyoxyethylene ether. The concentration of nonylphenol polyoxyethylene ether is 0.2% (w / w), and the solvent used is water.

Embodiment 3

[0083] Embodiment 3: When exploiting a certain oil reservoir, first use the energy of the reservoir formation itself to carry out oil extraction by swabbing, and when the oil field for oil extraction by swabbing reaches the limit of economic benefits of extraction, that is, when the input production cost is close to or equal to the output cost, the process ends Swabbing oil recovery does not carry out conventional water flooding oil recovery, but directly uses the displacement fluid injected with surfactant and added a small amount of additives for enhanced oil recovery.

[0084]The displacement fluid used to inject a surfactant and add a small amount of auxiliary agent is: two kinds of surfactants with different oil recovery properties are compounded and a small amount of alkali is added. The weight percentage of each component is:

[0085] Betaine: 86% (w / w)

[0086] Petroleum Sulfonate: 12% (w / w)

[0087] Alkali - sodium carbonate: 2% (w / w)

[0088] When in use, two kinds...

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Abstract

The invention relates to an oil-field largest swept volume chemical-flooding oil production method, which is applied to the technical field of oil production in oil fields. The method is applicable to all reservoirs which can be exploited by water flooding but are not exploited by water flooding. When oil is exploited, the self energy of the strata of a reservoir is first utilized to carry out flowing production or swabbing production; when an oil field adopting flowing production or swabbing production reaches the economic benefit limit of production, flowing production or swabbing production is ended, subsequent water-flooding production is not carried out any more, but chemical flooding injecting surfactant as main agent is directly adopted to intensify oil production. The method has the following advantages that: at the moment, the swept volume of the displacement of the chemical displacing fluid is the largest, which is best favorable for the exertion of the oil-washing effect ofthe surfactant, and thereby the yield of oil production can be increased to the max.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to an oilfield development method, which is suitable for oil reservoirs that can be developed by water flooding but not developed by water flooding. When the maximum swept volume is reached, a surfactant that improves the oil washing efficiency is injected to make the Oilfield development methods for maximizing oil recovery. Background technique [0002] At present, the sequence of oil recovery methods used in the development of conventional oilfields is firstly to use the energy of the reservoir formation itself to carry out spontaneous oil recovery or swabbing oil recovery, which is generally called primary oil recovery; after the energy of the reservoir is attenuated, water is injected from the injection well to replenish energy and displace crude oil. At the same time, the production well is swabbed and produced, which is commonly referred to as secondary oil r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/22
Inventor 楼诸红封永强王强
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