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Phase permeability modifying agent and method for improving recovery efficiency of crude oil by using same

A phase permeability and improving agent technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of lack of principled inventions, etc., and achieve the effect of improving oil displacement efficiency

Inactive Publication Date: 2005-06-29
DAQING OILFIELD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to further tap oil reserves, in recent years, a large number of researches and tests on enhanced oil recovery technologies have been actively carried out at home and abroad, mainly including polymer flooding technology, multi-component flooding technology, miscible flooding technology, deep profile control technology, etc., and good results have been obtained. However, in order to achieve better results and further increase the recovery rate, there is a lack of new principled inventions

Method used

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  • Phase permeability modifying agent and method for improving recovery efficiency of crude oil by using same
  • Phase permeability modifying agent and method for improving recovery efficiency of crude oil by using same
  • Phase permeability modifying agent and method for improving recovery efficiency of crude oil by using same

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specific Embodiment approach 1

[0012] Embodiment 1: The phase permeability improving agent of this embodiment is composed of polyacrylamide (PAM) and a cross-linking agent, wherein the concentration of polyacrylamide is 100-5000 ppm, and the concentration of cross-linking agent is 100-5000 ppm. The molecular weight of the polyacrylamide is 1 million to 40 million, and the degree of hydrolysis is 0 to 40%. The crosslinking agent is one or more of organic chromium, inorganic chromium, organic aluminum and inorganic aluminum.

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that it also includes a surfactant accounting for 0.001-0.2% of the total weight of the phase permeability improving agent, and the surfactant can be anionic, cationic or nonionic Surfactants such as petroleum sulfonates or alkylbenzene sulfonates. Other compositions and contents are the same as in Embodiment 1.

specific Embodiment approach 3

[0014] Specific embodiment 3: The difference between this embodiment and specific embodiments 1 and 2 is that it also includes a co-solvent accounting for 0.01-30.0% of the total weight of the phase permeability improving agent, and the co-solvent is ethanol, propanol, isopropyl One or more of alcohol, amyl alcohol, formaldehyde and acetaldehyde. Other compositions and contents are the same as those in Embodiments 1 and 2.

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Abstract

Disclosed are phase percolation rate improver and the method of increasing crude oil producing by it, relating to a chemical agent-percolation rate improver for increasing crude oil producing in crude oil employment, and the method to increase crude oil producing by phase percolation rate improver. The phase percolation rate improver is comprised of 100-5000ppm polyacrylamide and 100-5000ppm cross linking agent, and the method to increase the productivity is as follows: inject percolation rate improver in large dosage into the water well, then use other displacing fluid to make waterdisplacing, polymerdisplacing or poly. The invention has realized increasing the productivity by several effect, it has the following characteristics: increasing the edge-water encroachment efficiency of wave and volume while injecting the phase percolation rate improver, after that increasing the edge-water encroachment efficiency in the course of injecting the waterdisplacing or displacing of other liquid.

Description

Technical field: [0001] The invention relates to a chemical agent for improving oil recovery in oil reservoir development-phase permeability improving agent, and a method for improving oil recovery by using the phase permeability improving agent. Background technique: [0002] In the century of rapid development of the modern petroleum industry, petroleum has become a powerful booster to promote the rapid development of the world economy. At present, most of the oil fields in the world have entered the mature mining period one after another, and oil is a non-renewable (compared with the history of human evolution) extractive mineral deposits. How to obtain more oil energy to the greatest extent is of great importance to the sustainable development of the current world economy. decisive role. Therefore, enhanced oil recovery technology has received extensive attention worldwide. In order to further tap oil reserves, in recent years, a large number of researches and tests on...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 王德民韩松李庆松
Owner DAQING OILFIELD CO LTD
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