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Compound plug removal technological method for offshore oil field injection well

A process method and technology for offshore oil fields, which are applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and mining, etc., can solve the problems of blockage of polymer injection wells, restore normal production of formation permeability, and achieve the purpose of removing formation blockage, The effect of restoring the normal production of the oilfield and restoring the formation permeability

Active Publication Date: 2013-10-09
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of composite plugging removal process for polymer injection wells, which can be used to completely and thoroughly remove plugging forms of polymer injection wells in which organic matter and inorganic scale are mixed with each other, so as to effectively solve the above polymer flooding process The plugging problem of the medium injection well can be solved, so as to restore the formation permeability and the normal production of the oil field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] On March 3, 2012, the B06 polymer injection well in Bohai SZ36-1 oilfield was unblocked. Firstly, 12 cubic meters of formation pretreatment agent was injected and the well was shut down for 24 hours. The pump injection method is to squeeze 90 cubic meters of oxidation plugging remover and shut down the well for 24 hours, forwardly squeeze 30 cubic meters of treatment fluid, forward squeeze 10 cubic meters of post fluid, and forward squeeze 30 cubic meters of replacement fluid. In the above plugging removal process, the formation pretreatment agent is a polymer extender solution, and the ingredients (the following ingredients are all in percent by mass) are: 10% strong negative charge treatment agent, 5% emulsifier; the oxidation plugging removal agent is a compound Oxidation system, the ingredients are: 20% oxidant, 10% oxidation aid, 5% oil layer protection agent; the main component of the pre-fluid and post-fluid is 10% hydrochloric acid solution, and the spacer fluid ...

Embodiment 2

[0014] On May 5, 2012, A30 polymer injection well in Bohai SZ36-1 oilfield was unplugged. First, 9 cubic meters of formation pretreatment agent was injected and the well was shut down for 24 hours. The pump injection method is to squeeze 75 cubic meters of oxidation plugging remover and shut down the well for 24 hours, to squeeze 18 cubic meters of treatment fluid, to squeeze 16 cubic meters of post fluid, and to squeeze 30 cubic meters of replacement fluid. In the above plugging removal process, the formation pretreatment agent is a polymer extender solution, the composition is: 10% strong negative charge treatment agent, 5% emulsifier; the oxidation plugging removal agent is a compound oxidation system, the composition is: 20% Oxidant, 10% oxidation aid, 5% oil reservoir protection agent; the main components of pre-fluid and post-fluid are hydrochloric acid solution with a concentration of 10%, the isolation fluid is a polycarboxylic acid solution with a concentration of 45%,...

Embodiment 3

[0016] On December 2, 2011, the A5 injection well of LD10-1 oilfield in Bohai Sea was unplugged. Firstly, 10 cubic meters of formation pretreatment agent was injected and the well was shut down for 24 hours. The pump injection method is to squeeze 90 cubic meters of oxidation plugging remover and shut down the well for 24 hours, to squeeze 18 cubic meters of treatment fluid, to squeeze 12 cubic meters of post fluid, and to squeeze 30 cubic meters of replacement fluid. In the above plugging removal process, the formation pretreatment agent is a polymer extender solution, the composition is: 10% strong negative charge treatment agent, 5% emulsifier; the oxidation plugging removal agent is a compound oxidation system, the composition is: 20% Oxidant, 10% oxidation aid, 5% oil reservoir protection agent; the main components of the pre-fluid and post-fluid are 10% hydrochloric acid solution, the spacer fluid is a polycarboxylic acid solution with a concentration of 45%, and the main...

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Abstract

The invention discloses a compound plug removal technological method for an offshore oil field injection well. The compound plug removal technological method for the offshore oil field injection well is characterized by comprising the following steps of forwards extruding stratum pretreating agent, closing the well for 24 hours, forwards extruding prepad fluid, forwards extruding spacer fluid, forwards extruding oxidative plug removable agent, closing the well for 24 hours, forwards extruding processing agent, forwards extruding postpad fluid, forwards extruding displacing liquid, and finishing construction. The stratum pretreating agent comprises cocoamidopropyl betaine, coconut diethanol amine and sodium lignin sulfonate, the mass ratio among cocoamidopropyl betaine, coconut diethanol amine and sodium lignin sulfonate is 1:1:1, and the use mass concentration is 15%. The prepad fluid is hydrochloric acid, and the mass concentration is 10%. The spacer fluid comprises a compound of tartaric acid, fatty alcohol ether sulfosuccinic acid solution, the mass ratio between tartaric acid and fatty alcohol ether sulfosuccinic acid solution is 2:1, and the mass concentration is 45%. The oxidative plug removal agent comprises a compound of calcium oxide and tert-Butyl hydroperoxide, the mass ratio of calcium oxide and tert-Butyl hydroperoxide is 3:1, and the mass concentration is 35%. The processing agent comprises fluoboric acid, wherein the mass concentration is 13%. The postpad fluid comprises hydrochloric acid, wherein the mass concentration is 10%. The displacing liquid is water injected and allocated on site.

Description

technical field [0001] The invention belongs to the technical field of increasing production and injection of oil-water wells in the petroleum industry, and relates to a process for removing plugging of polymer injection wells in offshore oil fields. Background technique [0002] In recent years, the tertiary oil recovery technology in my country's offshore oilfields has developed rapidly, among which polymer flooding has been widely promoted in my country's offshore oilfields due to its simple technology, large range of enhanced oil recovery and good economic benefits. However, polymers are easily affected by formation adsorption, mechanical trapping, formation clay expansion and particle migration, and are easily trapped in porous media, resulting in reduced pore flow cross-sections, increased liquid flow resistance, and reduced permeability. At the same time, due to incomplete dissolution, incompatibility between the molecular weight and the pore throat radius of the form...

Claims

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Application Information

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IPC IPC(8): E21B37/06C09K8/524C09K8/528
Inventor 赵迎秋靳晓霞滕厚开卢大艳吴威
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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