Composite oil displacement agent for increasing recovery ratio of low-permeability reservoir and preparation method thereof

A low-permeability reservoir and composite flooding technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of unstable product performance, restricted performance, poor broad spectrum, etc., achieve good results and reduce use Concentration, cost reduction effect

Inactive Publication Date: 2020-06-16
东野升富 +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The currently used oil displacement agent products have poor broad-spectrum and are often suitable for one formation but not for another
Furthermore, the performance of the oil displacement agent is limited by the quality of pet...

Method used

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  • Composite oil displacement agent for increasing recovery ratio of low-permeability reservoir and preparation method thereof
  • Composite oil displacement agent for increasing recovery ratio of low-permeability reservoir and preparation method thereof
  • Composite oil displacement agent for increasing recovery ratio of low-permeability reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A composite oil displacement agent for enhanced oil recovery in low-permeability reservoirs, consisting of the following components in weight percent: polyacrylamide 12.5%, azobisisobutyronitrile 0.8%, styrene 18%, active polymer dispersant 5.5% %, ethanol 32% and water balance.

[0025] The structural formula (I) of the active polymer dispersant is:

[0026]

[0027]

[0028] Wherein, R is a β-hydroxyvinylsulfone sulfate active group.

[0029] The preparation method of the composite oil displacement agent for the enhanced recovery of the low permeability reservoir comprises the following steps:

[0030] Step 1, dissolving styrene in ethanol and stirring evenly to obtain solution A;

[0031] Step 2, dissolving azobisisobutyronitrile in 12 times of water to obtain solution B;

[0032] Step 3, dissolving polyacrylamide and active polymer dispersant in the remaining water to obtain solution C;

[0033] Step 4: Heat the container containing solution C in a water b...

Embodiment 2

[0035] A composite oil displacement agent for enhanced oil recovery in low-permeability reservoirs, consisting of the following components in weight percent: polyacrylamide 15%, azobisisobutyronitrile 0.5%, styrene 22%, active polymer dispersant 3 %, ethanol 35% and water balance.

[0036] The structural formula (I) of the active polymer dispersant is:

[0037]

[0038] Wherein, R is a s-triazine active group.

[0039] The preparation method of the composite oil displacement agent for the enhanced recovery of the low permeability reservoir comprises the following steps:

[0040] Step 1, dissolving styrene in ethanol and stirring evenly to obtain solution A;

[0041] Step 2, dissolving azobisisobutyronitrile in 15 times of water to obtain solution B;

[0042] Step 3, dissolving polyacrylamide and active polymer dispersant in the remaining water to obtain solution C;

[0043] Step 4: Heat the container containing solution C in a water bath at 70°C until the temperature is...

Embodiment 3

[0045] A composite oil displacement agent for enhanced oil recovery in low-permeability reservoirs, consisting of the following ingredients in weight percent: 8% polyacrylamide, 1% azobisisobutyronitrile, 15% styrene, and 6% active polymer dispersant %, ethanol 25% and water balance.

[0046] The structural formula (I) of the active polymer dispersant is:

[0047]

[0048] Wherein, R is an acrylamide active group.

[0049] The preparation method of the composite oil displacement agent for the enhanced recovery of the low permeability reservoir comprises the following steps:

[0050] Step 1, dissolving styrene in ethanol and stirring evenly to obtain solution A;

[0051] Step 2, dissolving azobisisobutyronitrile in 8 times of water to obtain solution B;

[0052] Step 3, dissolving polyacrylamide and active polymer dispersant in the remaining water to obtain solution C;

[0053] Step 4: Heat the container containing solution C in a water bath at 75°C until the temperature...

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Abstract

The invention discloses a composite oil displacement agent for increasing the recovery ratio of a low-permeability reservoir. The composite oil displacement agent comprises polyacrylamide, an initiator, styrene, an active polymer dispersing agent, ethanol and water. A preparation method comprises the following steps: dissolving the styrene in ethanol, and uniformly stirring to obtain a solution A;dissolving the initiator into 8-15 times of water to obtain a solution B; dissolving the polyacrylamide and the active polymer dispersing agent in the rest of water to obtain a solution C; putting acontainer containing the solution C into a water bath, heating until the temperature is stable, then adding the solution A, and uniformly stirring; and then dropwise adding the solution B at a constant speed in a nitrogen protection environment in a stirring state, and continuously stirring for 2-3 hours after dropwise adding is finished. The oil displacement agent can reduce the oil-water interfacial tension and change the oil reservoir wettability, and has the advantages of small adsorption capacity on the surface of oil reservoir rock, small adsorption loss, low use concentration, low cost,high oil displacement rate and the like.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a composite oil displacement agent for increasing recovery of low-permeability reservoirs. Background technique [0002] With the increasing global demand for oil and gas resources, the proportion of unconventional oil and gas resources in oil and gas resources is increasing, and the focus of exploration and development of oil and gas resources is gradually shifting to unconventional ultra-low permeability oil and gas reservoirs. At present, the proven reserves of low-permeability oil reservoirs in my country account for more than 70% of the total reserves, which is the focus and difficulty of future development. However, after long-term water injection development, the main oilfields in my country have entered the medium-high water-cut period. After entering the high-water-cut period, the decline in oil production has accelerated. The recovery rate of water flooding is ...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/584C08F112/08
CPCC09K8/588C09K8/584C08F112/08
Inventor 东野升富贾玲贾万录李多杨晓影张峰刘欣
Owner 东野升富
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