Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover

A technology of plugging agent and well section, applied in the field of tertiary oil recovery, can solve the problem of difficult effective contact and reaction between chemical agents and corresponding blockages, ignore the characteristics of deep plugging in polymer injection plugged wells, and the plugging removal effect is far from indoor test results and other problems, to achieve the effect of improving plugging removal efficiency, removing oily dirt plugging, and good fluidity

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, an effective polymer injection well usually injects polymer solution for 3 to 4 years or even longer. During the long injection process, the adsorption, retention and mechanical trapping of polymer in the formation porous Penetrating deep into the formation, causing deep formation plugging, at the same time, the whole process profile control measures widely used in the process of polymer flooding to inhibit polymer channeling further aggravated the deep formation plugging, which requires the solution of polymer injection plugged wells The blocking radius must reach a certain depth
[0005] At present, the plugging removal technology of polymer injection wells adopted in China generally has the following technical problems: First, the complexity of plugging in polymer injection wells is ignored, and

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  • Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover

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Example Embodiment

[0033] Example 1

[0034] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 5%, ammonium chloride 2%, the balance is water; oxidized gel breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 20%, active agent 2%, JHS-1 steel anti-oxidation corrosion inhibitor 2%, ethanol 5%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 10%, citric acid 20%, fluoboric acid 6%, ammonium bifluoride 3%, ammonium chloride 1%, JHB-1 type high-efficiency oil washing agent 3%, JHS-1 steel anti-oxidation corrosion ...

Example Embodiment

[0040] Example 2

[0041] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 2%, ammonium chloride 1%, the balance is water; oxidizing gel-breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 10%, active agent 1%, JHS-1 steel anti-oxidation corrosion inhibitor 0.5%, ethanol 2%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 5%, citric acid 10%, fluoboric acid 5%, ammonium bifluoride 2%, ammonium chloride 1%, JHB-1 type high-efficiency oil washing agent 2%, JHS-1 steel anti-oxidation corrosio...

Example Embodiment

[0043] Example 3

[0044] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 3.5%, ammonium chloride 1.5%, the balance is water; oxidizing gel-breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 15%, active agent 1.5%, JHS-1 steel anti-oxidation corrosion inhibitor 1.2%, ethanol 3.5%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 7.5%, citric acid 15%, fluoboric acid 5.5%, ammonium bifluoride 2.5%, ammonium chloride 1.5%, JHB-1 type high-efficiency oil washing agent 2.5%, JHS-1 steel anti-...

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Abstract

The invention discloses a combined blocking remover for a polymer injection blocking well section plug and a preparation method and application of the combined blocking remover, belonging to the technical field of tertiary oil recovery. The blocking remover comprises a blocking remover for an oxidizing and gel breaking section plug consisting of the following components in percentage by weight: 10-20 percent of sodium percarbonate, 1-2 percent of active agent, 0.5-2 percent of corrosion inhibitor, 2-5 percent of mutual solvent and the balance of water. According to the combined blocking remover for the polymer injection blocking well section plug, the blocking remover for the oxidizing and gel breaking section plug has the characteristics of high oxidizing and gel breaking rate, low corrosion and high safety. The oxidative decomposition and gel breaking rate on polyacrylamide and a cross-linking polymer gel system thereof which are commonly used in oilfield polymer flooding is over 96 percent, and the corrosion rate detected by adopting an N80 steel sheet standard test piece is 1g/m2.h below. After the polymer injection well blockage is decomposed and subjected to gel breaking, the original viscous black blockage is changed into a transparent aqueous solution, the blocking remover is high in liquidity and low in residue rate, the polymer injection well formation plugging can be efficiently removed, and the aims of removing blockage and increasing injection are achieved.

Description

technical field [0001] The invention specifically relates to a polymer injection blocked well slug combined plugging removal agent, and a preparation method and application of the combined plugging removal agent, belonging to the technical field of tertiary oil recovery. Background technique [0002] Polymer flooding technology is the leading technical measure to suppress the decline of crude oil production and further enhance the oil recovery in the later stage of oilfield water flooding development. However, in the process of polymer flooding, due to the adsorption, retention and mechanical trapping of polymers in the formation porous media, it is very easy to cause formation blockage of polymer injection wells. In order to suppress polymer channeling and expand the swept volume of polymer during polymer flooding, polymer gel is usually used for profile control at different stages such as before, during and after polymer flooding, which further aggravates the The formatio...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528E21B43/22
CPCC09K8/524C09K8/528C09K8/532C09K2208/26C09K2208/32E21B37/06
Inventor 陈渊李飞鹏温栋良黄春燕杨安国赵明儒尹晓静
Owner CHINA PETROLEUM & CHEM CORP
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