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A kind of consolidatable foam plugging agent

A foaming agent and blocking agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of high cost, difficulty in forming effective blocking strength, etc., and achieve low cost, simple and safe production, and sealing. Strong blocking effect

Active Publication Date: 2020-12-11
DAGANG OIL FIELD GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention aims to propose a consolidatable foaming plugging agent to solve the problem of high cost and difficulty in forming effective plugging strength for existing plugging agents for medium and low permeability formation seal water plugging in oil exploitation. technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of the condensable foaming plugging agent of the present invention comprises the following steps,

[0042] 1) Preparation of foaming agent aqueous solution: according to the ratio of raw materials, dissolve the foaming reaction raw materials ammonium chloride and sodium nitrite into tap water, and stir evenly at a low speed of 200 rpm for 20 minutes;

[0043] 2) Prepare epoxy resin low-viscosity solution: according to the ratio of raw materials, mix low-viscosity crude oil, triethylenetetramine, and surfactant in the epoxy resin in sequence, and stir evenly at a low speed of 200 rpm for 20 minutes;

[0044] 3) Preparation of emulsion type epoxy resin: Stir at a low speed of 200 rev / min for the epoxy resin low-viscosity solution prepared in step 2), add the foaming agent aqueous solution prepared in step 1) dropwise during the stirring process, and after the dropwise addition is completed, airtightly stir tank, and stir at a high speed of 8000 rpm ...

Embodiment 1

[0046] Raw materials (both commercially available industrial products): 30 kg of epoxy resin, 30 kg of low-viscosity crude oil, 5 kg of triethylenetetramine, 2.7 kg of ammonium chloride, 3.4 kg of sodium nitrite, 10 kg of tap water, surface Active agent 0.5 kg. The product of the present invention, the consolidated foaming plugging agent, is obtained strictly according to the preparation method described above. As the surfactant, Span-80 was used.

[0047] Indoor medium and low permeability artificial core plugging simulation test comparison: prepared permeability 220×10 -3 μm 2 The artificial cylindrical core has an outer diameter of 25.5mm and a core length of 200.4mm. Use a peristaltic pump to inject the consolidatable foaming plugging agent at a rate of 2mL / min, with an injection volume of 0.8PV and an injection permeability of 220×10 -3 μm 2 artificial core. The breakthrough pressure of the artificial core was tested to be 2.4 MPa after the artificial core was solid...

Embodiment 2

[0049]Raw materials (both commercially available industrial products): 50 kg of epoxy resin, 50 kg of low-viscosity crude oil, 10 kg of triethylenetetramine, 5.4 kg of ammonium chloride, 6.8 kg of sodium nitrite, 20 kg of tap water, and Active agent 1.0 kg. The product of the present invention, the consolidated foaming plugging agent, is obtained strictly according to the preparation method described above. As the surfactant, Span-60 was used.

[0050] Indoor medium and low permeability artificial core plugging simulation test comparison: prepared permeability 220×10 -3 μm 2 The artificial cylindrical core has an outer diameter of 25.3mm and a core length of 200.2mm. Use a peristaltic pump to inject the consolidatable foaming plugging agent at a rate of 2mL / min, the injection volume is 0.8PV, and the injection permeability is 215×10 -3 μm 2 artificial core. The breakthrough pressure of the artificial core was tested to be 3.5 MPa after the artificial core was solidified ...

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Abstract

The invention provides a curable foaming plugging agent. The curable foaming plugging agent is prepared from the following components in parts by weight: 25 to 55 parts of epoxy resin, 25 to 55 parts of low-viscosity crude oil, 3 to 12 parts of triethylenetetramine, 2.1 to 6 parts of ammonium chloride, 3 to 7.2 parts of sodium nitrite, 5 to 25 parts of water and 0.3 to 1.2 parts of a surfactant. The curable foaming plugging agent provided by the invention is a low-viscosity emulsion solution, the production is simple and safe and side reaction and byproducts are few. The raw materials including a foamable material and the like are adopted, so that the plugging capability is higher than that of common epoxy resin type plugging agents. The raw materials including the low-viscosity crude oil and the like are adopted so that the cost of the curable foaming plugging agent is less than that of the common epoxy resin type plugging agents.

Description

technical field [0001] The invention belongs to the technical field of petroleum engineering and oil field chemistry, and in particular relates to a condensable foaming plugging agent. Background technique [0002] In the late stage of oilfield development, during the development of multi-layer systems and the adjustment of layer systems, it is necessary to seal and water off high water-bearing layers and ineffective development layers, so as to ensure the normal production of other oil-bearing layers. The so-called water plugging of oil and water wells refers to injecting plugging agent into the target layer to block the seepage channel of the formation, so as to realize the complete isolation of the fluid and pressure inside the formation from the inside of the wellbore and other formations. [0003] The water plugging of oil and water well sealing layer requires high plugging strength of plugging agent. Oil well cement plugging agents are usually used to seal layers in h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/518C09K8/508
CPCC09K8/5086C09K8/518
Inventor 杨卫华葛红江雷齐玲曲岩程静徐佳妮雷齐松赵勇刚易博
Owner DAGANG OIL FIELD GRP
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