Polymer flooding alternating injection method of heterogeneous oil reservoir

An alternate injection and heterogeneous technology, applied in the direction of drilling composition, chemical instruments and methods, earth drilling and production, etc., to achieve good oil displacement effect, increase recovery rate, and control inefficiency

Inactive Publication Date: 2012-08-01
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the many factors that affect the polymer flooding effect, there are relatively few studies on the optimization of injection methods, and most of them focus on the research on polymer injection parameters.

Method used

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  • Polymer flooding alternating injection method of heterogeneous oil reservoir
  • Polymer flooding alternating injection method of heterogeneous oil reservoir
  • Polymer flooding alternating injection method of heterogeneous oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] Example: The first slug injects 0.14PV polymer with a molecular weight of 2500×10 4 , a polymer solution (high viscosity slug) with a concentration of 2000mg / L, the polymer molecular weight of 0.14PV injected into the second slug is 1200×10 4 1. A polymer solution (low-viscosity slug) with a concentration of 2000mg / L, so circulated for two cycles, and a total of 4 polymer slugs were injected, totaling 0.56PV.

[0042] 4. Experimental results

[0043] When the comparative example adopts a single slug injection method, the cumulative liquid absorption ratio of the low-osmotic layer is 27.3%, and when the embodiment adopts the alternate injection method, the cumulative liquid absorption ratio of the low-osmotic layer is 36.7%. The provided method of adopting the alternate injection method obviously increases the liquid absorption capacity of the hypotonic layer, and the increase range is relatively obvious.

[0044] Calculation method of cumulative liquid absorption rati...

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Abstract

The invention relates to a polymer flooding alternating injection method of a heterogeneous oil reservoir, which comprises the step of alternatively injecting high-viscosity slug and low-viscosity slug into the heterogeneous oil reservoir, wherein the step of alternating injection is carried out at least for one time. The high-viscosity slug and the low-viscosity slug are solutions provided with different concentrations and obtained by mixing polymers with different molecular weights and saline water. By means of the polymer flooding alternating injection method, the polymer flooding operation in an alternating injection method can inhibit profile reverse rotation, increase liquid absorption amount of a low-permeability layer, control low-efficiency and ineffective circulation, effectively utilize the reserve volume of the low-permeability layer, improve the yield rate and reduce polymer using amount.

Description

technical field [0001] The invention relates to a polymer flooding method used in oil flooding and recovery operations in oil fields, in particular to an alternate injection method for polymer flooding in heterogeneous oil layers, and belongs to the technical field of petroleum exploitation. Background technique [0002] In the initial stage of oil field development, water flooding is usually used for production, that is, the crude oil is driven to flow and produced by injecting water into the formation. When the oil field is developed in the middle and later stages, with the increase of water cut in the oil field, the production of water flooding gradually decreases, and the recovery rate of water flooding generally only reaches about 40%. In order to further enhance oil recovery, polymer flooding is usually used. The oil displacement mechanism is to increase the viscosity of injected water, improve the water-oil mobility ratio, and expand the swept volume of the oil displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/588
Inventor 韩培慧曹瑞波孙刚
Owner PETROCHINA CO LTD
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