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Plugging agent for oil field gas driving

A technology for oil field gas and plugging agent, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of gas escaping, unsuitable profile control and water plugging, etc., and achieves improved efficiency, convenient preparation, and gel strength. big effect

Inactive Publication Date: 2015-03-25
四川晨瑞石油化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the nature of these reservoirs, there will be obvious problems such as gas escape during the carbon dioxide flooding process, and due to the technical characteristics of carbon dioxide flooding itself, the original profile control and water shutoff agents are no longer suitable for profile control of carbon dioxide flooding wells water blocking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: Take a 1000ml beaker, measure 498ml of tap water, and start stirring. Weigh 2g of blocking agent and thickener, and evenly sprinkle it into the stirring tap water. After adding the thickener, continue to stir for 30 minutes, and let it stand for 30 minutes, waiting for use. Take 100ml of the dissolved tackifier, add 1.0g of cross-linking agent, stir evenly, and place it in an oven at 45°C.

[0008] After 5 hours, the mixture of Example 1 was taken out, and its viscosity was measured at 75° C. using a six-speed rotational viscometer to be 235 mPa.S. The mixture was placed again in the oven at 75°C.

[0009] After 43 hours, the mixture of Example 1 was taken out. At 75°C, a six-speed rotational viscometer was used to test its viscosity to be 15300 mPa.S. The crosslinking time and the viscosity after 48 hours could meet the requirements of profile control and water shutoff.

example 2

[0010] Example 2: Take a 1000ml beaker, measure 497.5ml of tap water, and start stirring. Weigh 2.5g of blocking agent tackifier, sprinkle it evenly into the tap water being stirred, after adding the tackifier, continue to stir for 30 minutes, let it stand for 30 minutes, and wait for use. Take 100ml of dissolved tackifier, add 1.25g of cross-linking agent, stir evenly, and place it in an oven at 75°C.

[0011] After 5 hours, the mixture of Example 1 was taken out, and its viscosity was measured at 75° C. using a six-speed rotational viscometer to be 368 mPa.S. The mixture was placed again in the oven at 75°C.

[0012] After 43 hours, take out the mixture of Example 1, and use a six-speed rotary viscometer to test its viscosity at 75°C, and its viscosity is 13820mPa.S. The crosslinking time and the viscosity after 48 hours can meet the requirements of profile control and water shutoff.

example 3

[0013] Example 3: Take a 1000ml beaker, measure 497ml of tap water, and start stirring. Weigh 3.0g of blocking agent and thickener, and evenly sprinkle it into the stirring tap water. After adding the thickener, continue to stir for 30 minutes, let it stand for 30 minutes, and wait for use. Take 100ml of dissolved tackifier, add 1.5g of cross-linking agent, stir evenly, and place it in an oven at 90°C.

[0014] After 5 hours, the mixture of Example 1 was taken out, and its viscosity was measured at 90° C. using a six-speed rotational viscometer to be 168 mPa.S. The mixture was placed again in the oven at 75°C.

[0015] After 43 hours, take out the mixture of Example 1, and use a six-speed rotary viscometer to test its viscosity at 75°C, and its viscosity is 11600mPa.S. The crosslinking time and the viscosity after 48 hours can meet the requirements of profile control and water shutoff.

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PUM

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Abstract

The invention discloses a plugging agent for oil field gas driving, and the plugging agent is mainly applied to profile control and water plugging employing a carbon dioxide flooding well in an oil field. The plugging agent comprises the following components in percentage by weight: 0.2%-0.7% of a plugging agent tackifier for oil field gas driving, 0.2%-1.5% of a cross-linking agent and the balance of water. The plugging agent is prepared by the following steps: firstly, adding clear water to a liquid dispensing tank at the ratio, starting stirring, and evenly scattering the plugging agent tackifier for oil field gas driving; and stopping stirring, so as to prepare the plugging agent for use after a thickening agent is completely dissolved and dispersed. The cross-linking agent is added according to the actual requirement ratio during fracturing construction. The plugging agent is convenient to prepare, and large in gelling viscosity when used by matching with the cross-linking agent; gas escape is relatively well prevented; and the plugging agent can play a good role in profile control and water plugging by using the carbon dioxide flooding well.

Description

Technical field: [0001] The invention relates to the field of profile control and water shutoff in oil fields. The patent of the invention belongs to the profile control and water shutoff of carbon dioxide flooding wells in oil fields, and is an efficient profile control water shutoff agent. technical background: [0002] Carbon dioxide flooding technology is mainly used in high water-cut reservoirs, heterogeneous reservoirs, and heavy oil reservoirs that are not suitable for thermal recovery in the late stage of oilfield production. Due to the nature of these reservoirs, there will be obvious problems such as gas escape during the carbon dioxide flooding process, and due to the technical characteristics of carbon dioxide flooding itself, the original profile control and water shutoff agents are no longer suitable for profile control of carbon dioxide flooding wells Water blocking. Invention content: [0003] The purpose of the present invention is to overcome the existin...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/512
Inventor 倪望青闫旭君刘冬冬
Owner 四川晨瑞石油化工有限责任公司
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