Polymer flooding method for secondary oil layer

An oil layer and polymer technology, which is applied in chemical instruments and methods, earth-moving drilling and production, and fluid production, etc., can solve problems such as the need for injection and polymerization of second-class oil layers that are not applicable

Inactive Publication Date: 2007-04-11
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of polymer flooding method for the second type of oil layer to solve the problem...

Method used

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Experimental program
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specific Embodiment approach 1

[0004] Specific embodiment 1: The method of this embodiment is: inject polymer into the second type oil layer, the concentration of injected polymer is 600mg / L~1200mg / L, the molecular weight of injected polymer is 8 million~19 million, the injected polymer For polyacrylamide. The preparation method of the polymer in this embodiment is as follows: the polymer and clear water are mixed and stirred evenly at a concentration ratio of 600 mg / L-1200 mg / L, and the molecular weight of the polymer is 8 million-19 million.

specific Embodiment approach 2

[0005] Embodiment 2: In the method of this embodiment, the concentration of the injected polymer is 650 mg / L, and the molecular weight of the injected polymer is 8.2 million. The polymer with this concentration and molecular weight is suitable for core permeability at 0.11μm 2 Inject when left or right to prevent clogging of the oil layer. Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0006] Embodiment 3: In the method of this embodiment, the concentration of the injected polymer is 1000 mg / L, and the molecular weight of the injected polymer is 17.5 million. The polymer with this concentration and molecular weight is suitable for core permeability at 0.3μm 2 Injection at the above time can prevent the oil layer from clogging. Other methods are the same as in Embodiment 1

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Abstract

The present invention relates to polymer flooding method in oil field, and is especially polymer flooding method for secondary oil layer. The method is to inject polymer solution of polyacrylamide of molecular weight 8,000-19,000 KD and concentration 600-1200 mg/L into secondary oil layer. The polymer solution is compounded through mixing polymer with clear water via stirring. The present invention has the beneficial effect of lowering the relative water injectivity, lowering the water content and raising the oil recovering rate from secondary oil layer.

Description

technical field [0001] The invention relates to a polymer flooding method in an oil field. Background technique [0002] With the large-scale popularization and application of polymer flooding technology in the main oil layers of oilfields, the area and reserves of the main oil layers that can be developed by polymer flooding are becoming less and less. Permeable layer, the effective permeability is 0.2-0.3μm 2 , the rock particles are relatively fine, the median particle size is 0.09-0.16mm; the median pore size is 0.06mm) has become the main target of polymer flooding to tap the potential. There are great differences in the adjustment of measures and measures from those in the first-class oil layers, and the original polymer flooding method for the first-class oil layers is no longer suitable for the needs of polymer injection in the second-class oil layers. Contents of the invention [0003] The object of the present invention is to provide a kind of polymer flooding ...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/588
Inventor 苏延昌程富莉魏守芳石志成吴赞校
Owner DAQING OILFIELD CO LTD
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