An Improved CO₂-Crude Oil Minimum Miscibility Pressure Correlation

Abstract

According to the PVT high pressure physical parameters of oil and gas, Using the PVTI in reservoir numerical simulation software Eclipse to determine the phase characteristics of the fluid, fitting the basic parameters and building component model, using the GEM modular program of CMG to calculate the oil displacement efficiency under different inject pressure, according to oil displacement efficiency and injection pressure relationship curve presents two lines before and after the inflection point, regressing the equation of two lines, and the intersection of the pressure be determined the minimum miscibility pressure of carbon dioxide-crude oil; in order to confirm the results, at the same time using slim tube experiment method and empirical formula methods to determine the minimum miscibility pressure of carbon dioxide-crude oil, and the slim tube experiment should be treated as the reference standard, Calculating the relative error of CMG method and the empirical formula method which are compared with the measured value of slim tube method. The results show that when the reservoir temperature are 90℃and 108℃, the carbon dioxide-crude oil minimum miscibility pressure of Shu 101 block in Yushulin oilfield is predicted by CMG, comparing with measured value of slim tube method, the relative error are 1.54% and 0.72%, the average relative error is 1.13%, which is less than the commonly used empirical formula of relative error average value, showing that carbon dioxide-oil minimum miscibility pressure is accurate and reliable by CMG.

Sử dụng thuật toán di truyền để xây dựng phương trình thực nghiệm xác định giá trị áp suất hòa trộn tối thiểu (MMP) trong bơm ép khí CO2 vào vỉa dầu khí

“…Trong Bảng 2, số liệu có thứ tự từ 1 -28 được trích dẫn từ bài báo của Emera và Sarma [13]; từ 29 -39 được trích dẫn từ bài báo của Li và nnk [14]; từ 40 -44 được trích dẫn từ bài báo của Zhang và nnk [15].…”

A Nonconventional CO₂-EOR Target in the Illinois Basin: Oil Reservoirs of the Thick Cypress Sandstone

“…The mole fractions of the pseudocomponents (Table 5.12) were adjusted in Desktop-PVT until the EOS-derived fluid properties matched the observed density and viscosity of crude oil at initial reservoir pressure (approximately 7,984 kPa [1,158 psi]) and temperature (~31.7°C (~89°F)). The MMP of CO2 and oil at a reservoir temperature of 31.7°C (89°F) ranged from 6,895-7,585 kPa (1,000-1,100 psi) using correlations from Yellig and Metcalfe (1980), Chen et al (2013), andZhang et al (2015); this estimation compared favorably with the laboratory-determined estimate of 7,585-8274 kPa (1,100-1,200 psi) at reservoir temperature (33°C (91.4°F)) for a crude oil sample from Noble Field (see Section 5.3.1). The Lohrenz-Bray-Clark correlation was used to calculate the viscosity of the crude oil.…”

Integrating support vector regression with genetic algorithm for CO2-oil minimum miscibility pressure (MMP) in pure and impure CO2 streams

“…Generally, CO 2 can be injected as miscible or immiscible flooding but miscible flooding is far more effective than immiscible flooding for light and medium crude oil mostly because of the capillary pressure involved in multiphase flow in porous rock. The successful design and operation of CO 2 miscible flooding depends greatly on the so-called minimum miscible pressure (MMP) at which the local displacement efficiency may approach to 100% [4,5]. Consequently, accurate knowledge of CO 2 -oil MMP has become a key factor for CO 2 miscible flooding.…”