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High mineralization oil reservoir composite oil displacement agent

A high salinity, compound flooding technology, applied in drilling compositions, chemical instruments and methods, production fluids, etc. The effect of apparent viscosity and viscoelasticity, good environmental protection and economic benefits

Active Publication Date: 2014-10-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to solve the defects of high-salinity reservoir oil-displacing agents in the above-mentioned prior art that are not high in temperature and salt resistance, and provides a composite oil-displacing agent made of high-salinity formation water

Method used

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  • High mineralization oil reservoir composite oil displacement agent
  • High mineralization oil reservoir composite oil displacement agent
  • High mineralization oil reservoir composite oil displacement agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Composite oil displacement agent for high salinity reservoirs at a temperature of 55°C

[0026] Total salinity 100000mg / L, Ca 2+ , Mg 2+ More than 2000mg / L formation water: 99.4%, biopolymer xanthan gum: 0.1%, fatty alcohol polyoxyethylene ether sodium sulfate: 0.5%, stir with a stirrer at high speed for 10 minutes to obtain a uniform and transparent composite oil displacement agent . At the same time, after sealing in a 50ml ampule bottle, observe the long-term thermal stability experiment in a 55°C water bath for 6 months, and measure the apparent viscosity and interfacial tension of the solution.

[0027] The apparent viscosity was measured by a BROODFIELD II viscometer from Brookfield Corporation of the United States at a speed of 6 rpm. The interfacial tension was measured by a TX500 spinning drop interfacial tensiometer produced by the University of Texas, and the crude oil sample was crude oil from the Baiyinchagan Dalqi Oilfield in Inner Mongolia. ...

Embodiment 2

[0030] Example 2 Composite oil displacement agent for high salinity reservoirs at a temperature of 85°C

[0031] Total salinity 200000mg / L, Ca 2+ , Mg 2+ More than 4000mg / L formation water: 99.4%, xanthan gum: 0.1%, sodium fatty alcohol polyoxyethylene ether sulfonate: 0.5%, stir with a stirrer at high speed for 10 minutes to obtain a uniform and transparent composite oil displacement agent. At the same time, after sealing in a 50ml ampule bottle, observe the long-term thermal stability experiment for 6 months at a constant temperature in a water bath at 85°C, and measure the apparent viscosity and interfacial tension of the solution.

[0032] The apparent viscosity was measured by a BROODFIELD II viscometer from Brookfield Corporation of the United States at a speed of 6 rpm. The interfacial tension was measured by a TX500 spinning drop interfacial tensiometer produced by the University of Texas in the United States, and the crude oil sample was crude oil from Shaer Shang, ...

Embodiment 3

[0036] Example 3 Composite oil displacement agent for high salinity reservoirs at a temperature of 90°C

[0037] Total salinity 250000mg / L, Ca2+, Mg2+ greater than 5000mg / L formation water: 99.3%, xanthan gum: 0.2%, nonylphenol polyoxyethylene ether sulfonate: 0.25%, aliphatic amine polyoxyethylene ether sulfonic acid Salt: 0.25%, stir with a mixer at high speed for 10 minutes to obtain a uniform and transparent composite oil displacing agent. At the same time, after sealing in a 50ml ampule bottle, observe the long-term thermal stability experiment at a constant temperature of 90°C for 6 months, and measure the apparent viscosity and interfacial tension of the solution.

[0038] time (days)

1

180

Solution apparent viscosity (mPa.s)

30.8

25.5

Oil-water interfacial tension (mN / m)

0.05

0.09

[0039] Apparent viscosity is measured by RS-600 rheometer of German Huck Company, and the rotating speed is 6rmp. The interfacial ten...

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Abstract

The invention relates to a kind of high mineralization oil reservoir composite oil displacement agent comprising the following components by mass: 97.5%-99.9% of highly mineralized formation brine with the salt content of 32000mg / L-360000mg / L and the Ca2 + and Mg2 + content of being greater than 1000mg / L, 0-0.5% of xanthan gum, 0.1%-1% of a negative-non ampholytic surfactant and 0%-1% of a negative-positive ampholytic surfactant, and by use of the synergistic effect among metal monovalent and divalent cations, biological polymers and amphoteric surfactant molecules, the oil displacement agent not only has higher viscosity, low interfacial tension, and long-term stability, and can meet the requirements of great improvement of recovery efficiency, technical oil displacement system wave and volume enlargement, and improvement of oil displacement efficiency of a high mineralization oil reservoir.

Description

Technical field: [0001] The invention relates to a composite oil displacement agent for developing high-salinity oil reservoirs in oilfields, and belongs to the technical field of oilfield chemistry. Background technique [0002] Oilfield chemical flooding enhances oil recovery technology, often using polymer flooding, polymer and surfactant binary composite flooding. [0003] In polymer flooding and composite flooding technologies at home and abroad, polymers are mostly synthesized from high-molecular polyacrylamide. The effect of adding polymers is to increase the viscosity of the displacement system and expand the swept volume of water flooding. Viscosification performance is very poor in medium and high salinity solutions, and it can only be used in oil reservoirs with a salinity of less than 30,000 mg / L, and the thermal stability cannot meet the needs of fluidity control, and the application temperature is less than 93°C. When synthetic polymers and temperature-resista...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K8/588
Inventor 莫冰李中超张还恩张金灵许先华杨瑞敏谢立新刘建红
Owner CHINA PETROLEUM & CHEM CORP
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