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Magnetorheological fluid-based oil-gas well temporary plugging agent as well as preparation method and application thereof

A magnetorheological fluid and temporary plugging agent technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problem of damage to reservoir or fracture permeability, production decline, and poor operation effect, etc. problems, to achieve the effects of easy flowback to the ground, little pollution impact, and low toxicity

Active Publication Date: 2014-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of temporary plugging agent needs to break the gel and flow back after operation. However, there are many insoluble substances in the gel breaker. Their existence will seriously damage the permeability of the reservoir or fracture, resulting in a decrease in production and poor operation effect.

Method used

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  • Magnetorheological fluid-based oil-gas well temporary plugging agent as well as preparation method and application thereof
  • Magnetorheological fluid-based oil-gas well temporary plugging agent as well as preparation method and application thereof
  • Magnetorheological fluid-based oil-gas well temporary plugging agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The preparation of the temporary plugging agent for oil and gas wells based on magnetorheological fluid, the steps are as follows:

[0058] (1) Add 124g of carbonyl iron powder into 92ml of deionized water, add it into a three-necked bottle heated by a water bath, add 7.4g of sodium dodecylbenzenesulfonate; keep the temperature of the water bath at 50°C, and mechanically stir at a speed of 500r / min 1h, the mixture was obtained;

[0059] (2) Let the mixed solution stand still, and remove the supernatant after the solid particles have settled completely; put the solid particles in a vacuum drying oven, dry at 50°C for 5 hours, and vacuum degree 0.01MPa; take out the solid particles after complete drying, and use a mortar Grinding to a particle size of 4-6 μm to obtain abrasive particles;

[0060] (3) Mix the abrasive particles with white oil at a solid phase concentration of 50wt%, stir at 500r / min for 5h, and disperse evenly to obtain a temporary plugging agent for oil ...

Embodiment 2

[0062] The preparation of the temporary plugging agent for oil and gas wells based on magnetorheological fluid, the steps are as follows:

[0063] (1) Add 140g of carbonyl iron powder into 104ml of deionized water, add it into a three-necked bottle heated by a water bath, add 10g of sodium lauryl sulfate; keep the temperature of the water bath at 50°C, and mechanically stir at a speed of 500r / min for 2h to obtain mixed solution;

[0064] (2) Let the mixed solution stand still, and remove the supernatant after the solid particles have settled completely; put the solid particles in a vacuum drying oven, dry at 50°C for 5 hours, and vacuum degree 0.01MPa; take out the solid particles after complete drying, and use a mortar Grinding to a particle size of 4-6 μm to obtain abrasive particles;

[0065] (3) Mix the abrasive particles with white oil at a solid phase concentration of 60wt%, stir at 500r / min for 7h, and disperse evenly to obtain a temporary plugging agent for oil and ga...

Embodiment 3

[0067] The preparation of the temporary plugging agent for oil and gas wells based on magnetorheological fluid, the steps are as follows:

[0068] (1) Add 100g of carbonyl iron powder into 73ml of deionized water, add it into a three-necked bottle heated by a water bath, add 6g of Tween80; keep the temperature of the water bath at 50°C, and mechanically stir at a speed of 500r / min for 1h to obtain a mixed solution;

[0069] (2) Let the mixed solution stand still, and remove the supernatant after the solid particles have settled completely; put the solid particles in a vacuum drying oven, dry at 50°C for 5 hours, and vacuum degree 0.01MPa; take out the solid particles after complete drying, and use a mortar Grinding to a particle size of 4-6 μm to obtain abrasive particles;

[0070] (3) Stir the abrasive particles at a solid phase concentration of 70wt% at 500r / min for 5h, and disperse them evenly to obtain a temporary plugging agent for oil and gas wells based on magnetorheolo...

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Abstract

The invention relates to a magnetorheological fluid-based oil-gas well temporary plugging agent as well as a preparation method and an application thereof. The temporary plugging agent is prepared from carbonyl iron powder modified by a surface modifier as magnetic particles and white oil as a carrier liquid. The invention also provides a preparation method and an application of the temporary plugging agent. The temporary plugging agent disclosed by the invention is good in stability, friendly to environment, low in raw material, simple in preparation technology, and applicable to industrial production, and can be applied to the temporary plugging occasion in development and production processes of oil and gas fields.

Description

technical field [0001] The invention relates to the application of magnetorheological fluid in the development of oil and gas fields as a temporary plugging agent in the operation process of oil and gas wells, and belongs to the technical field of material preparation. Background technique [0002] In the process of oil and gas field development, downhole operation of oil and gas wells is a common work. In some cases of downhole operations, it is necessary to inject a temporary plugging agent into the formation or fractures to isolate the wellbore and reservoirs or fractures. [0003] In some shallow low-pressure gas wells, when workover and potential tapping operations are performed, it is often necessary to fill the wellbore with killing fluid, and use the hydrostatic column pressure generated by the killing fluid to prevent formation fluid from flowing into the wellbore. However, these old wells are under low pressure due to long-term mining. If conventional downhole ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502E21B33/138
CPCC09K8/502E21B33/13E21B33/138
Inventor 罗明良孙涛温庆志刘飞郭烨杨国威吕子龙李楠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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