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A Prediction Method of Minimum Miscibility Pressure in CO2 Flooding

A miscible pressure and prediction method technology, applied in earthwork drilling, wellbore/well components, instruments, etc., can solve the problems of high cost, cumbersome calculation, and low prediction accuracy

Active Publication Date: 2018-09-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, such as time-consuming, expensive, cumbersome calculations, and low prediction accuracy, and provide a fast, economical and accurate CO 2 Prediction Method of Minimum Miscible Pressure in Flooding

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  • A Prediction Method of Minimum Miscibility Pressure in CO2 Flooding
  • A Prediction Method of Minimum Miscibility Pressure in CO2 Flooding
  • A Prediction Method of Minimum Miscibility Pressure in CO2 Flooding

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Embodiment Construction

[0024] The Qiaokou Oilfield in the Dongpu Sag was the first to use CO in the Zhongyuan Oilfield. 2 It is one of the low-permeability reservoirs with enhanced oil recovery. Combined with Qiaokou Oilfield CO 2 The prediction examples and accompanying drawings of flooding minimum miscibility pressure, the present invention is described in detail, by figure 1 As can be seen, the concrete steps of the present invention are as follows:

[0025] 1. Determination of basic characteristic parameters of formation crude oil: including dead oil volume V d , Excluded formation crude oil volume V of , dead oil quality W d , the volume V of flash off gas under standard conditions g , Density ρ of flash offgas under standard conditions g .

[0026] 1.1 Use the downhole sampler to extract formation crude oil samples in the wellbore separator of the oil production well;

[0027] 1.2 Use the extracted formation crude oil samples to determine the basic characteristic parameters of formatio...

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Abstract

The invention relates to a CO2 flooding minimum miscrible pressure prediction method, and belongs to the technical field of increasing the recovery ratio through CO2 flooding. The method includes the steps of firstly, determining basic characteristic parameters of in-place oil, wherein the basic characteristic parameters include the size of dead oil, the size of discharged in-place oil, the mass of the dead oil, the size of gas discharged through flashing under the standard condition and the density of the gas discharged through flashing under the standard condition; predicting parameters by determining the CO2 minimum miscrible pressure, wherein the parameters include the size coefficient of the in-place oil, the density of the in-place oil and the temperature of the in-place oil; predicting the CO2 flooding minimum miscrible pressure through the combination with the CO2 minimum miscrible pressure empirical constant. According to the method, the CO2 flooding minimum miscrible pressure is predicted only through the size coefficient and the density of the in-place oil and the temperature parameter of the in-place oil, the number of required experimental data is small, calculation is easy, and the CO2 flooding minimum miscrible pressure of a target oil deposit can be rapidly, economically and accurately predicted.

Description

technical field [0001] The present invention relates to a CO 2 A method for predicting the minimum miscible pressure in flooding, which belongs to CO 2 Flooding enhanced oil recovery technical field. Background technique [0002] CO 2 Oil flooding has the advantages of not being limited by reservoir temperature and salinity, wide application range, low oil flooding cost, and significant recovery improvement. It has become the field of enhanced recovery, especially in low permeability reservoirs. One of the most promising methods. According to miscible conditions, CO 2 Flooding can be divided into immiscible flooding and miscible flooding, and the oil displacement efficiency of miscible flooding is much higher than that of immiscible flooding. CO 2 Miscibility mainly depends on the displacement pressure, only when the displacement pressure is higher than the minimum miscibility pressure can miscible flooding be achieved. Therefore, the minimum miscibility pressure is C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00E21B43/16
Inventor 聂法健国殿斌李中超杜利王秋语郭立强戴厚柱乔勇
Owner CHINA PETROLEUM & CHEM CORP
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