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Solid-phase-free workover fluid as well as preparation method and application thereof

A solid-free, workover fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of settlement stability, temperature resistance and corrosion rate to be improved, and achieve high viscosity and density. Wide range, low corrosion rate effect

Active Publication Date: 2021-11-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a solid-free workover fluid and its preparation method and application, to at least solve the problems of the existing workover fluids in settlement stability, temperature resistance, etc. There are still issues to be improved in terms of performance and corrosion rate

Method used

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  • Solid-phase-free workover fluid as well as preparation method and application thereof
  • Solid-phase-free workover fluid as well as preparation method and application thereof
  • Solid-phase-free workover fluid as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] This embodiment provides a solid-free workover fluid and a preparation method thereof. The solid-free workover fluid includes 440g of HWJZ-1 weighting agent, 22g of shearing agent, 5g of corrosion inhibitor, 7g of waterproof locking agent, 17g of dispersant and 510g of clear water; wherein, the shearing agent is quaternary phosphorus Salt-modified montmorillonite; corrosion inhibitor is imidazoline; waterproof lock agent is perfluorooctane sulfonate; dispersant is sodium silicate;

[0041] The preparation method of the above-mentioned solid phase-free workover fluid comprises the following steps:

[0042](1) Measure clean water and add it to a high stirring cup, add a cutting agent to it, stir at a high speed of 12000r / min for 20min, after stirring well, let stand at room temperature 25°C for 24h to obtain the first mixed solution;

[0043] (2) Under the stirring action of 3000r / min, add waterproof lock agent, corrosion inhibitor and dispersant to the first mixed solut...

Embodiment 2

[0046] This embodiment provides a solid-free workover fluid and a preparation method thereof. The solid-free workover fluid includes 369g of HWJZ-1 weighting agent, 9g of shearing agent, 3.2g of corrosion inhibitor, 3g of waterproof locking agent, 10g of dispersant and 200g of clear water; wherein, the shearing agent is bentonite ; The corrosion inhibitor is sodium tungstate; the waterproof locking agent is trifluorocarboxylic acid; the dispersant is sodium alginate;

[0047] The preparation method of the above-mentioned solid phase-free workover fluid comprises the following steps:

[0048] (1) Measure clean water and add it to a high stirring cup, add a cutting agent to it, stir at a high speed of 12000r / min for 20min, after stirring well, let stand at room temperature 25°C for 24h to obtain the first mixed solution;

[0049] (2) Under the stirring action of 3000r / min, add waterproof lock agent, corrosion inhibitor and dispersant to the first mixed solution in sequence, and...

Embodiment 3

[0052] This embodiment provides a solid-free workover fluid and a preparation method thereof. The solid-free workover fluid includes 630g of HWJZ-1 weighting agent, 15g of shearing agent, 10g of corrosion inhibitor, 3g of waterproof locking agent, 13g of dispersant and 330g of clear water; wherein, the shearing agent is hydroxide Magnesium aluminum hydrotalcite; corrosion inhibitor is propynyl alcohol; waterproof lock agent is fluorinated quaternary ammonium salt surfactant; dispersant is potassium metasilicate;

[0053] The preparation method of the above-mentioned solid phase-free workover fluid comprises the following steps:

[0054] (1) Measure clean water and add it to a high stirring cup, add a cutting agent to it, stir at a high speed of 11000r / min for 25min, after stirring well, let stand at room temperature 22°C for 28h to obtain the first mixed solution;

[0055] (2) Under the stirring action of 2500r / min, add waterproof lock agent, corrosion inhibitor and dispersan...

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Abstract

The invention provides a solid-free workover fluid as well as a preparation method and application thereof. According to the solid-phase-free workover fluid, a solid-phase-free weighting agent, a shearing potentiator, a corrosion inhibitor, a water blocking preventing agent dispersing agent and water are adopted, the content of all the raw materials is limited, and the application density range of the solid-phase-free workover fluid can reach 1.5 g / cm < 3 >-1.82 g / cm < 3 > and the highest density can reach 1.80-1.82 g / cm < 3 > through interaction and synergistic interaction of all the raw materials; the solid-phase-free workover fluid provided by the embodiment of the invention has the characteristics of high density, low corrosion rate, small formation damage, strong sand carrying capacity, adjustable viscosity and the like, and can be used for workover operation of high-temperature, high-density and low-permeability reservoirs. According to the preparation method, by controlling the adding sequence of the raw materials in the preparation method, uniform mixing of the raw materials is facilitated, and the corresponding properties of the solid-phase-free workover fluid, such as temperature resistance and sedimentation stability, are improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas and completion / workover fluids, and in particular relates to a solid-free workover fluid and its preparation method and application. Background technique [0002] At present, China's onshore and offshore oil and gas drilling and production are extending to deep layers (under 4500m underground), ultra-deep layers (under 6000m underground) and shale gas fields, such as Xinjiang Tarim, Sichuan, South China Sea and other oil areas. The process needs to face special environments such as high pressure and high temperature. [0003] In the process of workover operations, the workover fluids with solid phase fluids are basically used at present, but the workover fluids with solid phase fluids often have long periods, poor stability of high-temperature settlement, and poor stability of workover fluids in reservoir workover operations. Medium-solid damage to the reservoir and other proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/528
CPCC09K8/52C09K8/528
Inventor 唐胜蓝孟祥娟彭建云王茜刘举杨宪民袁学芳刘明球吴红军张晖刘己全张宏强曾努王师张玫浩魏军会李美格
Owner PETROCHINA CO LTD
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