Self-adaptive flow control system and application thereof to high-temperature and high-salinity oil reservoir

A high-temperature, high-salt, self-adaptive technology, applied in the fields of production fluids, drilling compositions, wellbore/well components, etc., can solve the problems of low emulsion sweep efficiency, achieve outstanding economic benefits, improve oil recovery, Promising effects

Active Publication Date: 2019-03-01
SOUTHWEST PETROLEUM UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some researchers believe that the larger the permeability difference, the lower the sweep efficiency of the emulsion with the same properties

Method used

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  • Self-adaptive flow control system and application thereof to high-temperature and high-salinity oil reservoir
  • Self-adaptive flow control system and application thereof to high-temperature and high-salinity oil reservoir
  • Self-adaptive flow control system and application thereof to high-temperature and high-salinity oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The oil-water interfacial tension of embodiment 1 adaptive fluidity control system

[0031] The mineralization degree of preparation is 30000mg / L (Ca 2+ , Mg 2+ The concentration is 500mg / L) and 210236mg / L (Ca 2+ , Mg 2+ Mineralized water with a concentration of 11324 mg / L), add 0.2% N, N-bishydroxyethyl alkylamide, 0.15% C12 / C14 glycoside surfactant, 0.05% glycerin, and stir for 1 to 3 hours. Obtain an adaptive fluidity control system; use a TX500C rotating interfacial tensiometer to measure the relationship between the adaptive fluidity control system and two degassed crude oils (viscosities at 80°C are 25.1mPa·s and 8.3mPa·s respectively) at 80°C. Interfacial tension, measuring time 2h, to obtain a stable interfacial tension value. The self-adaptive fluidity control system is 3.0~22×10 4 The high salinity condition of mg / L can keep the interfacial tension of oil and water at 10 -2 ~10 -3 mN / m order of magnitude, showing excellent oil washing performance, the r...

Embodiment 2

[0034] Embodiment 2 Self-adaptive fluidity control system forms the viscosity of emulsion with crude oil

[0035] The mineralization degree of preparation is 30000mg / L (Ca 2+ , Mg 2+ The concentration is 500mg / L) and 210236mg / L (Ca 2+ , Mg 2+ Mineralized water with a concentration of 11324mg / L), sequentially add 0.2% N-hydroxyethyl alkylamide, 0.15% C12 / C14 glycoside surfactant, 0.05% glycerin, and stir for 1 to 3 hours to obtain self-adaptive Mobility control system; configure and seal the adaptive fluidity control system and crude oil according to the oil-water ratio of 5:5, 4:6, 3:7, 2:8, 1:9, and place them in an oil tank with a magnetic stirring device. in a bath; then in an oil bath at 95°C, stir magnetically for 1 hour, and observe the emulsification. After stirring, use a high-temperature and high-pressure Haake rheometer to measure the viscosity of the emulsion, crude oil, and salinity water at 140°C. See the table 2. Table 3. At high temperature and high salinity,...

Embodiment 3

[0042] Example 3 Enhanced Oil Recovery Performance of Adaptive Mobility Control System

[0043] The mineralization degree of preparation is 30000mg / L (Ca 2+ , Mg 2+ The concentration is 500mg / L) and 210236mg / L (Ca 2+ , Mg 2+ Mineralized water with a concentration of 11324 mg / L), add 0.2% N, N-bishydroxyethyl alkylamide, 0.15% C12 / C14 glycoside surfactant, 0.05% glycerin, and stir for 1 to 3 hours. Obtain an adaptive fluidity control system; in the displacement experiment of artificial simulated core (45×45×300mm, three-layer heterogeneity, average porosity 19.4%, gas permeability 100 / 200 / 500mD), temperature 104°C , the viscosity of crude oil is 18.1mPa s (104°C), and the original oil-bearing water saturation is 70.3%. In the water flooding stage, it is affected by heterogeneity and unfavorable water-oil mobility ratio. The oil recovery degree of water flooding is low, and the water cut The 98% oil recovery rate is 31.2%, and the remaining (residual) oil saturation is 48.4%...

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Abstract

The invention discloses a self-adaptive flow control system and application thereof to a high-temperature and high-salinity oil reservoir. The self-adaptive flow control system is composed of, by weight percentage, 0.1-0.4% of alkylolamides, 0.05-0.3% of glucoside surfactant, 0.01-0.1% of polyols and water as balance. According to application of the self-adaptive flow control system to the high-temperature and high-salinity oil reservoir, the properties of the high-temperature and high-salinity oil reservoir comprise that the temperature is 90-140 DEG C, the degree of mineralization of water is 3.0-22*10<4> mg/L, and the content of divalent ions is higher than 500 mg/L. With the content of water higher than 90% and an oil-water ratio of 1:1-1:9, the self-adaptive flow control system can for water-in-oil (W/O) emulsion or oil-in-water (O/W) emulsion of W/O and O/W mixed emulsion under shear induction, and the viscosity of the emulsion is 10 or more times as much as that of water in oilreservoir conditions to achieve automatic control of flow of displacement medium. The self-adaptive flow control system can significantly improve the recovery efficiency of the high-temperature and high-salinity oil reservoir, and is reliable in principle, outstanding in economic benefits and broad in application prospect.

Description

technical field [0001] The invention relates to an adaptive fluidity control system and its application in high-temperature and high-salt oil reservoirs, belonging to the technical fields of oilfield chemistry and oilfield exploitation. Background technique [0002] Reservoirs in the middle and late stages of waterflood development are adversely affected by oil-water mobility. Water is fingered along the high-permeability layer and flows around high oil-bearing areas. A large amount of crude oil is not swept, and the recovery degree of water flooding is low. According to statistics, my country's onshore oilfields have undergone elastic energy recovery and water flooding, and the recovery rate of crude oil is less than 40% (He Jiangchuan et al., Oilfield Development Strategy and Replacement Technology [J], Acta Petroleum Sinica, 2012, 33(3): 519 -525). Among these high-water-cut oilfields, high-temperature (higher than 90°C) high-salt (formation water salinity higher than 30,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60E21B43/22
CPCC09K8/584C09K8/602E21B43/16
Inventor 蒲万芬刘锐杜代军金发扬杨洋李亮
Owner SOUTHWEST PETROLEUM UNIV
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