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Blockage removing acid solution for removing blockage of high-temperature and high-pressure gas well shaft

An acid solution and plugging removal technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large formation damage, difficult dredging operation of coiled tubing, and corroded tubing, etc., to achieve small corrosion and strong industry Maximize the application value and the effect of small damage

Pending Publication Date: 2021-10-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The wellbore of the gas field with deep reservoir (5000-8038m), high temperature (120-190℃) and high formation pressure (105-136MPa) is used for plugging removal. The downhole coiled tubing dredging operation is even more difficult, and if conventional acidification and plugging removal is used to remove plugging, the corrosion rate of the acid solution to the high temperature and high pressure wellbore tubing will be greatly increased while the plugging is dissolved, which will not only severely corrode the tubing, but also damage the The formation damage is greater

Method used

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  • Blockage removing acid solution for removing blockage of high-temperature and high-pressure gas well shaft
  • Blockage removing acid solution for removing blockage of high-temperature and high-pressure gas well shaft
  • Blockage removing acid solution for removing blockage of high-temperature and high-pressure gas well shaft

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A well is a production Gas, depth of 7116m, the original formation pressure 123 MPa, bottom temperature 170 ℃. The initial oil production well 97.69MPa, Nissan gas 78.01 × 10 4 M 3 ; Production process due to the wellbore pressure and clogging declining yields, plugging off the wellbore before construction of acidizing, the well hydraulic 22.8MPa, Nissan gas 12.70 × 10 4 M 3 . Take the wellbore plug analysis showed that the main component was blocked for the scum and sand.

[0053] Using an acid of the present invention to resolve the block for plugging acid, acid composition: 9% hydrochloric acid, hydrofluoric acid 1%, 2% clay stabilizer, corrosion inhibitor 5.1% (3.4% + 1.7% main agent adjuvant) , drainage aid 2%, 2% ferric ion stabilizer, 5% methanol, 1% demulsifier. Wherein: said fracturing the clay stabilizer is poly acidified clay stabilizing cationic quaternary ammonium BD1-13, the corrosion inhibitor is acidified with inhibitor cyclohexanone ZX-09, as the drainage a...

Embodiment 2

[0059] B is a production Gas wells, depth 5100M, for the screen completion, 105MPa original formation pressure, bottom hole temperature 136 ℃. The initial oil production well 82MPa, Nissan gas 82.81 × 10 4 M 3 ; Production process due to the wellbore pressure and clogging declining yields, plugging off the wellbore before construction of acidizing, the well hydraulic 14.4MPa, Nissan gas 31.27 × 10 4 M 3 . Take the wellbore plug analysis showed that the main component was blocked for the scum and sand.

[0060]For the above B well, the acidified solution of the acidified solution of the present invention is displaced. The specific composition of the chromatic acid solution is: 9% hydrochloric acid, 1% hydrofluoric acid, 2% clay stabilizer, 4.5% corrosion inhibitor (3.0% main agent, 1.5% adjuvant), 2% boost agent, 2% iron ion stabilizer, 5% methanol, 1% demulsifier. Among them: The clay stabilizer is a clay stabilizer quaternary ammonium salt and high polymer XH-F, the corrosion inh...

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Abstract

The invention provides a blockage removing acid solution for removing blockage of a high-temperature and high-pressure gas well shaft. The blockage removing acid solution is prepared from 5-10 wt% of hydrochloric acid, 0-2.0 wt% of hydrofluoric acid, 1-3 wt% of a clay stabilizer, 3.0-6.0 wt% of a corrosion inhibitor, 1-3 wt% of a cleanup additive, 1-3 wt% of an iron ion stabilizer, 5-20 wt% of a waterproof blocking agent, 1-3 wt% of a demulsifier, and the balance of water . The blockage removing acid solution can effectively unblock the high-temperature and high-pressure shaft on the premise that a shaft oil pipe is not corroded basically and damage to a stratum is small.

Description

Technical field [0001] The present invention relates to the field of oil and gas field treatment, and more particularly to an interpolation for relieved high temperature and high pressure air well wellbore. Background technique [0002] In recent years, with the efficient development of gas fields, single well wellbore blockage and other problems gradually appear, most of the gas wells have a wellbore blockage problem, which will cause a sharp decline in gastrointestinal volume, in safety considerations, and even Guan Yizhi, to the gas field It is very difficult to stabilize. The uninterrupted treatment of the wellbore is an important part of the gas field production, usually using an acid-liquid dissolution, and performs a continuous tubing wellbore to achieve uninterrupted. [0003] A wellbore for the reservoir buried deep (5000 to 8038m), high temperature (120 ~ 190 ° C), high temperature high-temperature high-voltage gas well, such as the talli gas field, due to the reservoir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/52
CPCC09K8/528C09K8/52
Inventor 吴红军王茜刘举孙涛
Owner PETROCHINA CO LTD
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