Blockage-removing method for polymer flooding blocking wells

A polymer and mortar technology, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and mining, etc., can solve the problem of short plugging validity period, decreased production, and no consideration of the plugging characteristics of polymer injection wells near the wellbore, etc. problem, to achieve the effect of improving oil recovery, reducing impact, and high conductivity
CN106958438AActive Publication Date: 2017-07-18CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-07-18

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Abstract

The invention relates to a blockage-removing method for polymer flooding blocking wells, and belongs to the field of fracturing reformation of oil wells. The blockage-removing method includes the steps of conducting fracturing construction to an blocked oil layer caused by polymer injection and controlling the length of an artificial fracture to 40-60 m, and the height to no more than 20 m, specifically, the fracturing construction is small-scale fracturing construction by sequentially injecting stratum treating fluid with a volume of 10-35 m3, injecting ahead fluid with a volume of 10-30m3, injecting particle loaded fluid with a volume of 40-60 m3, and injecting displacing fluid with a volume of 8-16m3. By reasonable selection of the polymer flooding to block wells, the pertinency and effectiveness of subsequent fracturing measure reformation are improved; by control of the length and the height of the artificial fracture, not only the permeability of a polymer blocked oil layer in near bore zones and effectiveness of the measures are improved, but also wastes of materials and labor cost caused by an excessive large construction scale are avoided, the validity of fracturing blockage-removing measures is increasingly prolonged, and the reservoir recovery is improved.
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Description

technical field

[0001] The invention belongs to the field of fracturing reconstruction of polymer injection wells, and in particular relates to a plugging removal method for polymer flooding plugged wells. Background technique

[0002] In the process of oilfield water flooding development, the heterogeneity of reservoir and unfavorable mobility ratio lead to low sweep efficiency of water flooding. Polymer flooding is a commonly used technology to increase recovery in the process of secondary oil recovery in oilfields. The polymer used in polymer flooding is mostly high-molecular-weight polyacrylamide (molecular weight is about 15 million). The polymer solution first enters the high-permeability layer, and the subsequent injected water changes the flow direction around the polymer and enters the low-permeability layer, thereby increasing the sweep coefficient and achieving the purpose of enhancing oil recovery.

[0003] However, polymer injection wells often get blocked. Th...

Claims

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