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Microbubble workover fluid and preparation method thereof

A workover fluid and micro-bubble technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor thermal stability of micro-bubbles, and achieve improved foam stability, foaming ability, and large molecular weight Effect

Inactive Publication Date: 2017-10-24
PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microbubbles in this patent have poor thermal stability, and can only be used for pump inspection and sand flushing in low-pressure sandstone, low-pressure fractured oil and gas reservoirs, and low-pressure heavy oil reservoirs, but not for killing wells, replacing pipe strings, Workover operations such as layer transfer mining

Method used

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  • Microbubble workover fluid and preparation method thereof
  • Microbubble workover fluid and preparation method thereof
  • Microbubble workover fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Microbubble workover fluid in the present embodiment, by 200g clear water, 0.2g fatty alcohol polyoxyethylene ether AEO 18 , 0.4g Sapinberry extract, 1g xanthan gum, 0.3g thiourea.

[0030] The preparation method of the microbubble workover fluid in the present embodiment is:

[0031] 1) Accurately measure 200 ml of clear water with a graduated cylinder and place it in a 500 ml beaker. Slowly and evenly add 1 g of xanthan gum while stirring, then stir at high speed for 30 minutes at a stirring speed of 3000 r / min. During the stirring process, make xanthan gum Dissolve evenly, fully lift the viscosity, and obtain the mixed solution 1;

[0032] 2) Add 0.4g of Sapindus chinensis extract and 0.2g of fatty alcohol polyoxyethylene ether AEO to the mixed solution 1 obtained in step 1) while stirring 18 , stirred for 10 minutes, the stirring speed was 3000r / min, and mixed evenly to obtain the mixed solution 2;

[0033] 3) Add 0.3 g of thiourea to the mixed solution 2 obtaine...

Embodiment 2

[0035] The microbubble workover fluid in the present embodiment, by 200g clear water, 0.5g fatty alcohol polyoxyethylene ether AEO 18 , 1g Sapinberry extract, 2g xanthan gum, 0.6g thiourea.

[0036] The preparation method of the microbubble workover fluid in the present embodiment is:

[0037] 1) Accurately measure 200ml of water with a measuring cylinder and place it in a 500ml beaker, slowly and evenly add 2g of xanthan gum while stirring, then stir at high speed for 30min at a stirring speed of 3000r / min, during the stirring process, dissolve the xanthan gum Uniform, fully viscous, to obtain the mixed solution 1;

[0038] 2) Add 1g of Sapindus chinensis extract and 0.5g of fatty alcohol polyoxyethylene ether AEO to the mixed solution 1 obtained in step 1) while stirring 18 , stirred for 10 minutes, the stirring speed was 3000r / min, and mixed evenly to obtain the mixed solution 2;

[0039] 3) Add 0.6 g of thiourea to the mixed liquid 2 obtained in step 2) while stirring, ...

Embodiment 3

[0041] The microbubble workover fluid in the present embodiment, by 200g clear water, 1g fatty alcohol polyoxyethylene ether AEO 18 , 1.6g Sapinberry extract, 2g xanthan gum, 0.6g thiourea.

[0042] The preparation method of the microbubble workover fluid in the present embodiment is:

[0043]1) Accurately measure 200ml of water with a measuring cylinder and place it in a 500ml beaker, slowly and evenly add 2g of xanthan gum while stirring, then stir at high speed for 30min at a stirring speed of 3000r / min, during the stirring process, dissolve the xanthan gum Uniform, fully viscous, to obtain the mixed solution 1;

[0044] 2) Add 1.6g of Sapindus chinensis extract and 1g of fatty alcohol polyoxyethylene ether AEO to the mixed solution 1 obtained in step 1) while stirring 18 , stirred for 10 minutes, the stirring speed was 3000r / min, and mixed evenly to obtain the mixed solution 2;

[0045] 3) Add 0.6 g of thiourea to the mixed liquid 2 obtained in step 2) while stirring, s...

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Abstract

The invention relates to a microbubble workover fluid and a preparation method thereof and belongs to the field of workover treatment of petroleum and gas. The microbubble workover fluid provided by the invention is composed of the following components in parts by mass: 90-200 parts of water, 0.2-1.6 parts of soapberry extract, 0.1-1 part of fatty alcohol-polyoxyethylene ether AEO, 0.5-2 parts of xanthan gum and 0.3-0.8 part of thiourea. The microbubble workover fluid provided by the invention is high in viscosity, good in foam stability, high in oil resistance, high in capacity of resisting degree of mineralization and suitable for gas condensate-containing natural gas wells with high degree of mineralization and low pressure. The microbubble workover fluid provided by the invention is non-toxic and easy to degrade, and does not pollute the environment.

Description

technical field [0001] The invention relates to a microbubble workover fluid and a preparation method thereof, belonging to the field of oil and gas workover operations. Background technique [0002] Well workover is a work to eliminate faults and improve wellbore conditions to restore normal production of oil and gas wells. It is an important measure for oil and gas wells to increase single well production and recovery rate and extend production cycle, and it is also an important means to tap the potential of old wells, discover new layers, and expand exploration results. Before performing workover operations on production wells, it is usually necessary to fill the wellbore with workover fluid. Use the hydrostatic column pressure generated by the workover fluid to prevent the formation fluid from flowing into the wellbore, and help support the oil casing string, prevent the well wall from collapsing, and ensure the safety of construction operations. Well-killing fluid wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/518C09K8/514
CPCC09K8/514C09K8/518C09K8/584
Inventor 魏凯李国锋罗懿刘岳龙党冰华方彦明唐勤邱小庆王璇刘慧何荣华李雷
Owner PETROLEUM ENG TECH RES INST CHINA PETROLEUM & CHEM CORP NORTH CHINA OIL & GAS CO
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