Oil extraction method and CO<2> injection amount determination method and device used for assisting huff-puff oil increase

A technology to determine the method and injection rate, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of excessive or too little injection rate, low oil recovery efficiency, etc., and achieve cycle production time extension, High oil production efficiency and enhanced oil recovery effect

Inactive Publication Date: 2020-10-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides an oil recovery method, a CO 2 The method and device for determining the injection volume are used to solve the problem of low oil recovery efficiency caused by too much or too little injection of carbon dioxide

Method used

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  • Oil extraction method and CO&lt;2&gt; injection amount determination method and device used for assisting huff-puff oil increase
  • Oil extraction method and CO&lt;2&gt; injection amount determination method and device used for assisting huff-puff oil increase
  • Oil extraction method and CO&lt;2&gt; injection amount determination method and device used for assisting huff-puff oil increase

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Embodiment 1

[0035] A method for determining the injection amount of carbon dioxide for assisting throughput and increasing oil according to the present invention, the method considers the physical parameters of the oil layer and the solubility of carbon dioxide in oil and water to determine the injection amount of carbon dioxide. Combine below figure 1 , to describe the method in detail.

[0036] First, according to the following relationship: pore volume V p and carbon dioxide injection Positively correlated, crude oil density ρ 0 and carbon dioxide injection Positively correlated, the gas-oil ratio R 0 and carbon dioxide injection Positively correlated, air-water ratio R w and carbon dioxide injection Positively correlated, crude oil compressibility B 0 and carbon dioxide injection Negatively correlated, build a carbon dioxide injection model, the model is:

[0037]

[0038] In the formula, is the amount of carbon dioxide injected, t; V p is the pore volume, m 3 ;S...

Embodiment 2

[0050] In implementation 1 of the method for determining the amount of carbon dioxide injection used to assist throughput increase, in the carbon dioxide injection amount model, the set coefficient k is set to 509. In this implementation, the set coefficient k is no longer 509, and adjustments are made on the basis of 509 to increase or decrease appropriately.

[0051] Embodiment of the device for determining the amount of carbon dioxide injection used to assist throughput and increase oil:

[0052] A device for determining the amount of carbon dioxide injection for assisting throughput increase of the present invention, such as Figure 4 As shown, the device includes a memory, a processor and an internal bus, and the processor and the memory communicate with each other through the internal bus.

[0053] The processor may be a processing device such as a microprocessor MCU or a programmable logic device FPGA.

[0054] The memory can be a high-speed random access memory, or a...

Embodiment 3

[0109] In oil recovery method implementation 1, in order to avoid damage to the insulated oil pipe caused by steam injection after injection of low-temperature liquid carbon dioxide, nitrogen gas is also injected at the same time as carbon dioxide injection. In this embodiment, nitrogen gas is not injected together.

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Abstract

The invention belongs to the technical field of oilfield chemistry, and particularly relates to an oil extraction method and a CO<2> injection amount determination method and device used for assistinghuff-puff oil increase. The oil extraction method comprises the following steps that firstly, pore volume, oil saturation, crude oil density, gas-oil ratio, gas-water ratio and crude oil compressioncoefficient are acquired, and substituting the pore volume, the oil saturation, the crude oil density, the gas-oil ratio, the gas-water ratio and the crude oil compression coefficient into a carbon dioxide injection amount model is carried out to obtain carbon dioxide injection amount; the carbon dioxide injection amount model is constructed according to the relationship between the carbon dioxideinjection amount and the pore volume, the oil saturation, the crude oil density, the gas-oil ratio, the gas-water ratio and the crude oil compression coefficient; then the carbon dioxide injection speed is determined; and finally, carbon dioxide is injected to assist huff and puff according to the determined carbon dioxide injection amount and injection speed so that oil extraction can be carriedout. According to the model, the physical parameters of an oil layer and the solubility of the carbon dioxide in oil and water are fully considered, the obtained carbon dioxide injection amount is proper, the oil extraction efficiency is high, and the crude oil yield is high.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to an oil recovery method, a CO 2 Method and device for determining injection volume. Background technique [0002] The global heavy oil and oil sand resources are huge, and their geological reserves are higher than the sum of conventional oil and gas resources. In recent years, due to the progress of heavy oil development technology, the supply of conventional crude oil is tight, which brings opportunities for the development of super heavy oil, which has the potential to replace conventional oil. The strategic position of energy. [0003] Heavy oil is a complex, multi-component homogeneous organic mixture, mainly composed of alkanes, aromatics, colloids, and asphaltenes. There are some special differences between heavy oil and ordinary crude oil. Among them, the content of colloid and asphalt in heavy oil is high, the light fraction is less, and the densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16G06F17/15
CPCE21B43/164E21B43/168G06F17/15
Inventor 袁光喜罗全民顾宇鹏宋增亮徐星光
Owner CHINA PETROLEUM & CHEM CORP
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