Method and device for evaluating contribution degree of chemical system in-situ emulsification to improvement of crude oil recovery ratio

A technology of contribution degree and recovery factor, which is applied in the field of evaluating the contribution degree of chemical system in-situ emulsification to enhanced oil recovery factor, and can solve problems such as the lack of quantitative contribution test methods

Active Publication Date: 2020-12-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to overcome the lack of quantitative contribution test methods of chemical system in-situ emulsification to EOR in the prior art, and to provide a method for evaluating the contribution of chemical system in-situ emulsification to EOR This method can more directly, simply and accurately evaluate the contribution of chemical system in-situ emulsification to enhanced oil recovery

Method used

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  • Method and device for evaluating contribution degree of chemical system in-situ emulsification to improvement of crude oil recovery ratio
  • Method and device for evaluating contribution degree of chemical system in-situ emulsification to improvement of crude oil recovery ratio
  • Method and device for evaluating contribution degree of chemical system in-situ emulsification to improvement of crude oil recovery ratio

Examples

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Embodiment 1

[0089] This example is to illustrate the use of the device of the present invention to evaluate the contribution of chemical system in-situ emulsification to enhanced oil recovery.

[0090] use figure 1 device shown.

[0091] In the chemical system: the polymer is partially hydrolyzed polyacrylamide with a relative molecular weight of about 19 million, the concentration is 1500mg / L; the surfactant is petroleum sulfonate KPS used in Xinjiang Oilfield, the concentration is 0.5%; the crude oil is taken from Xinjiang Oilfield, stored Viscosity 18mPa at layer temperature 43°C . s; the interfacial tension between the chemical system and crude oil is 8×10 -3 mN / m. The first core model uses an artificial core model of 4.5cm×4.5cm×30cm, with an average permeability of 500mD and a porosity of 21.5%; the second core model is a cylindrical natural core with a gas permeability of 282mD, a diameter of 2.5cm, and a length of 7.5cm , and its porosity is 20.8%.

[0092] (1) Vacuumize the ...

Embodiment 2

[0104] This example is to illustrate the use of the device of the present invention to evaluate the contribution of chemical system in-situ emulsification to enhanced oil recovery.

[0105] use figure 1 device shown.

[0106] In the chemical system: the polymer is partially hydrolyzed polyacrylamide with a relative molecular weight of about 25 million, the concentration is 1500 mg / L, the surfactant is petroleum sulfonate DPS used in Dagang Oilfield, the concentration is 0.5%, and the crude oil is taken from Dagang Oilfield. Viscosity 51mPa at layer temperature 53°C . s, the interfacial tension between the chemical system and crude oil is 4×10 -3 mN / m. The first part uses an artificial core model of 4.5cm×4.5cm×30cm, with an average permeability of 500mD and a porosity of 21.3%; the second part uses an artificial homogeneous flat sandstone model with a size of 4.5cm×30cm×30cm and a permeability of 2000× 10 -3 mD, the schematic diagram of the model is shown in Figure 5 As...

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Abstract

The invention relates to the technical field of oilfield development, and discloses a method and device for evaluating the contribution degree of chemical system in-situ emulsification to improvementof the crude oil recovery ratio. The method comprises the steps that (I) a first core model and a second core model are vacuumized and then injected into formation water, then the formation water is driven by oil, and the saturated oil mass Vo1 of a second core is calculated; (II) after the first core is driven by water, produced liquid is obtained through driving by a chemical system; (III) the second core is driven by the produced liquid, and the oil displacement Vo3 after emulsification of the chemical system is calculated; (IV) the steps (I) - (II) are repeated, and the saturated oil massVo2 of the second core is calculated; and (V) the produced liquid of the first core is subjected to demulsification treatment and then drives the second core, and the oil displacement Vo4 of non-emulsification of the chemical system is calculated. The contribution degree of chemical system in-situ emulsification to improvement of the crude oil recovery ratio is calculated according to the formula(a), wherein W = (Vo3 / Vo 1-Vo 4 / Vo2) * %; and formula (a) sees the description.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method and a device for evaluating the contribution degree of chemical system in-situ emulsification to enhanced oil recovery. Background technique [0002] Most of the water-flooded reservoirs in my country have entered a period of high water cut or even ultra-high water cut, the heterogeneity of reservoirs has intensified, the distribution of remaining oil is more scattered, and development is difficult. The annual oil production of chemical flooding technology, which is the main technology of enhanced oil recovery in medium and high permeability reservoirs, has reached 8% of my country's annual crude oil production, which is an important guarantee for the stable production of many mature oil fields. During the application of chemical composite flooding with surfactants, the production wells in many blocks have observed obvious emulsification phenomenon. Petroleu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/28E21B43/22
CPCE21B43/16G01N33/2823
Inventor 刘哲宇李宜强徐泉邴旭
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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