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Solid corrosion inhibition capsule and preparation method and application method thereof

A corrosion-inhibiting, capsule-based technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as excessive downhole residue, poor stability, and uncontrollable slow-release rate of corrosion inhibitors

Active Publication Date: 2020-02-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a solid corrosion inhibitor capsule and its preparation method and application method. The first purpose is to solve the problems of poor natural settlement, many downhole residues, poor durability and poor stability existing in existing solid corrosion inhibitors; The second is to solve the problem of uncontrollable slow release rate of corrosion inhibitors

Method used

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preparation example Construction

[0041] The present invention also protects a preparation method of a solid corrosion-inhibiting capsule, which is prepared according to the following steps:

[0042] Step S1, taking the inorganic nano-skeleton and the corrosion inhibitor, mixing according to the mass ratio of 1: (50-80), stirring with a high-speed stirrer for 4-8 hours, forming a uniform and stable viscous liquid;

[0043] Step S2, take the weighting agent, add it into the viscous liquid in step S1 according to the mass ratio of the corrosion inhibitor and the weighting agent at a ratio of 1: (0.2-0.8), and stir for 1-12 hours until the weighting agent is evenly dispersed in the viscous liquid , forming a homogeneous liquid;

[0044] Step S3, according to the proportion, add the homogeneous liquid of step S2, PVAC-4, sodium cetyl sulfonate, sorbitan monostearate, lauryl ether phosphate into the stirring tank, and mix uniformly to obtain PVAC- 5;

[0045] Step S4, extruding PVAC-5 into strips using a twin-screw...

no. 1 approach

[0059] This embodiment protects a solid corrosion-inhibiting capsule, which includes an inner core and an outer covering film covering the inner core. The inner core is composed of inorganic nano-skeleton, weighting agent and corrosion inhibitor in proportion.

[0060] Wherein, the inorganic nano-skeleton is composed of inorganic nanoparticles and surface treatment liquid mixed according to the mass ratio of 1:10; 0.01 part of hydrogen, 0.5 part of pH regulator, and 1 part of water.

[0061] The inorganic nano-skeleton is prepared according to the following steps:

[0062] Step 1, preparing the surface treatment liquid: according to the proportion, 1 part of organosilane, 0.01 part of hydrogen peroxide, 0.5 part of pH regulator, and 1 part of water are mixed and stirred evenly to prepare the surface treatment liquid;

[0063] Step 2, according to the mass ratio of 1:10, mix the inorganic nanoparticles and the surface treatment solution, and stir at 65°C-85°C for 1-2h with a ...

no. 2 approach

[0079] This embodiment protects a solid corrosion-inhibiting capsule, which includes an inner core and an outer covering film covering the inner core. The inner core is composed of inorganic nano-skeleton, weighting agent and corrosion inhibitor in proportion.

[0080] Wherein, the inorganic nano-skeleton is composed of inorganic nanoparticles and surface treatment liquid mixed according to the mass ratio of 1:15; 1.5 parts of hydrogen, 1 part of pH regulator, and 0 parts of water.

[0081] The inorganic nano-skeleton is prepared according to the following steps:

[0082] Step 1, prepare the surface treatment liquid: according to the proportion, 4 parts of organosilane, 1.5 parts of hydrogen peroxide, 1 part of pH regulator, 0 part of water are mixed and stirred evenly to prepare the surface treatment liquid;

[0083] Step 2, according to the mass ratio of 1:20, mix the inorganic nanoparticles and the surface treatment liquid, and stir them with a magnetic ion stirrer at 65 ...

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Abstract

The invention provides a solid corrosion inhibition capsule and a preparation method and an application method thereof. The solid corrosion inhibition capsule comprises an inner core and an outer coating film wrapping the inner core, wherein the inner core consists of an inorganic nanometer framework, a weighting agent and a corrosion inhibitor in proportion; and the outer coating film is a naturally degradable high-molecular polymer film, can realize slow release of the corrosion inhibitor, and can finally realize thorough degradation in oil well produced liquid, and the dissolution rate of the outer coating film meets the requirement for slow release of corrosion inhibition particles at the bottom of a well for 3 months. According to the preparation method, a twin-screw extruder and a granulator are employed for processing so as to obtain spherical particles with diameters in a range of 1-3 mm; the water content of the particles is controlled between 3% and 8%, so the strength of theparticles can be kept; and the particles can be stably released in water under the condition of a pressure of 10 MPa in indoor evaluation. The corrosion inhibitor is slowly released by utilizing micropores in the solid microcapsules, and the released corrosion inhibitor can be gradually diffused into crude oil of a shaft, so the purpose of long-term corrosion prevention through one-time injectionis achieved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical additives, and in particular relates to a solid corrosion-inhibiting capsule, a preparation method and an application method thereof. Background technique [0002] Most of my country's onshore oilfields have entered the middle and late stages of development, and the water content in the produced fluid is quite high. Due to geological reasons, these produced water have dissolved different degrees of CO 2 、H 2 S, O 2 Substances that are corrosive to metals, such as bacteria and dissolved salts, can easily cause serious corrosion to related equipment and pipelines. According to literature reports, the average loss due to corrosion in the petroleum and petrochemical industry accounts for about 6% of the output value. If proper protective measures are taken, 30% to 40% of the corrosion loss can be recovered. Therefore, anticorrosion of oilfield equipment and pipelines can not only reduce safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C23F11/10
CPCC09K8/54C23F11/10C23F11/08
Inventor 苑慧莹杨立华李琼玮杨会丽姜毅刘宁戚建晶李慧何淼周佩
Owner PETROCHINA CO LTD
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