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Workover fluid tackifier and preparation method of same

A technology of viscosifier and workover fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., which can solve the problems of low high temperature resistance and achieve the effect of improving high temperature stability

Inactive Publication Date: 2016-01-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a workover fluid viscosifier and a manufacturing method to solve the technical problem of low high temperature resistance in the prior art when xanthan gum is used as a viscosifier

Method used

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  • Workover fluid tackifier and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The temperature at the bottom of a certain well was 133°C, and sand was produced. The xanthan gum sand flushing fluid prepared by conventional methods could not carry the sand out smoothly. Take 95.65 parts of water and add it to the liquid mixing tank with agitator as the base liquid, add 3 parts of potassium formate and stir for 5 minutes; 10 to 20 minutes, the feeding speed and stirring time shall be subject to the full dissolution of xanthan gum; add 0.2 parts of thiourea and stir for 5 minutes; add 0.15 parts of fungicide and stir for 5 minutes; finally add 0.5 parts of ethylenic monomer polymer Stir for about 10 minutes until the solution is uniform to obtain the solution of the workover fluid viscosity enhancer described in the embodiment of the present invention.

[0073] 40 cubic meters of the above solution was transported to a well with a tank truck and used as a sand-carrying fluid. The bottom of the well was flushed with 35 meters of sand. The operation was...

Embodiment 2

[0075] The temperature at the bottom of a well was 137°C, and sand was produced. The xanthan gum sand flushing fluid prepared by conventional methods could not carry the sand out smoothly. Take 96.1 parts of water and add it into the liquid mixing tank with agitator as the base liquid, add 2 parts of potassium formate and stir for 5 minutes; 10 to 20 minutes, the feeding speed and stirring time shall be subject to ensuring that the xanthan gum is fully dissolved; add 0.2 parts of thiourea and stir for 5 minutes; add 0.2 parts of fungicide and stir for 5 minutes; finally add 1 part of ethylenic monomer polymer Stir for about 10 minutes until the solution is uniform to obtain the solution of the workover fluid viscosity enhancer described in the embodiment of the present invention.

[0076] 60 cubic meters of the above-mentioned solution was transported to a well (bottom hole temperature 137°C) by tank truck, and used as a sand-carrying fluid. The bottom-hole sand washing was 25...

Embodiment 3

[0078] The temperature at the bottom of a well was 135°C, and sand was produced. The xanthan gum sand flushing fluid prepared by conventional methods could not carry the sand out smoothly. Take 97.5 parts of water and add it to the liquid mixing tank with agitator as the base liquid, add 1 part of potassium formate and stir for 5 minutes; 10 to 20 minutes, the feeding speed and stirring time shall be subject to the full dissolution of xanthan gum; add 0.1 part of thiourea and stir for 5 minutes; add 0.1 part of fungicide and stir for 5 minutes; finally add 0.8 part of ethylenic monomer polymer Stir for about 10 minutes until the solution is uniform to obtain the solution of the workover fluid viscosity enhancer described in the embodiment of the present invention.

[0079] 40 cubic meters of the above solution was transported to a well (bottom hole temperature 135°C) by a tank truck, and used as a sand-carrying fluid. The bottom-hole sand washing was 25 meters, and the operati...

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Abstract

The invention relates to the field of oil field workover and discloses a workover fluid tackifier and a preparation method of same. The invention solves the technical problem that when xanthan gum is employed as the tackifier in the prior art, the anti-high-temperature capability is poor. The workover fluid tackifier includes, by weight, 95.1-98.05 parts of water, 0.3-0.5 parts of xanthan gum, 1-3 parts of potassium formate, 0.05-0.2 parts of thiourea, 0.1-0.2 parts of a sterilizing agent and 0.5-1 part of an olefin monomer polymer. The workover fluid tackifier is enhanced in high-temperature stability of the xanthan gum.

Description

technical field [0001] The invention relates to the field of oil field workover operations, in particular to a workover fluid viscosity increaser and a manufacturing method thereof. Background technique [0002] Xanthan gum is more viscosifying, thickening, anti-salt, anti-pollution, etc., especially in suspension than other polymers. It is used in mud treatment, drilling and completion fluids and workover The effect of well fluid and other aspects is remarkable, and it has obvious effects on accelerating drilling speed, preventing oil well collapse, protecting oil and gas fields, preventing blowout and greatly improving oil recovery. [0003] Xanthan gum aqueous solution is heated and frozen repeatedly within a certain temperature range (4°C to 93°C), and its viscosity is hardly affected. Some studies have pointed out that adding low-priced organic salts such as potassium formate to xanthan gum aqueous solution can restore its viscosity to more than 70% after cooling at a ...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 刘福鹏韩芳樊松林郭元庆辉建超王小芳周小平张晓春柴希军
Owner PETROCHINA CO LTD
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