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Special high temperature-resistant thread grease for steam-injection insulated pipe and preparation method thereof

A heat-insulating pipe and high-temperature-resistant technology, applied in the field of high-temperature resistant thread grease, can solve the problems of increasing the development cost of heavy oil thermal recovery wells, casing string expansion, casing failure, etc. Auxiliary anti-adhesion effect

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature resistance of thread grease used in oil fields is currently limited. Generally, the high temperature resistance can only reach within 190°C. As the temperature rises, some components in the thread grease will be lost, and finally it will be powdery, unable to continue to play its role. Auxiliary sealing and anti-sticking effect, resulting in heat loss to the outside of the heat insulation tube, which will lead to heat loss on the one hand and increase the development cost of heavy oil thermal recovery wells; on the other hand, it will increase the temperature of the external casing, due to thermal expansion The effect of cold shrinkage will cause the casing string to expand as a whole, causing casing failure accidents

Method used

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  • Special high temperature-resistant thread grease for steam-injection insulated pipe and preparation method thereof
  • Special high temperature-resistant thread grease for steam-injection insulated pipe and preparation method thereof
  • Special high temperature-resistant thread grease for steam-injection insulated pipe and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0014] Preparation of component A: first add 7% of phenyltriethoxysilane and 5% of methylcyclohexyldimethoxysilane into the reaction kettle, heat it while stirring so that the temperature reaches 70°C, and react for 3 hours Then, in the process of stirring, add 52% E-51 epoxy resin, 12% ethyl acetate, 9% cyclohexanone and 0.7% dibutyltin dilaurate, 14.3% polytetrafluoroethylene powder, then raise the temperature to 150°C, stir, and heat to reflux for 3 hours to obtain component A.

[0015] Preparation of component B: Add 25% polyamide curing agent, 32% graphite powder, 39% talcum powder and 4% asbestos fiber into the reaction kettle in sequence, then turn on the low-speed stirring and high-speed shearing functions at the same time, stir After 3 hours, component B was obtained.

[0016] Finally, mix A and B components evenly according to the ratio of 2:1 by weight to obtain a paste-like high-temperature-resistant thread grease. Apply the thread grease to the surface of the hea...

example 2

[0021] Preparation of component A: first add 6% of phenyltriethoxysilane and 6% of methylcyclohexyldimethoxysilane into the reaction kettle, heat it while stirring so that the temperature reaches 70°C, and react for 3 hours Then, in the process of stirring, add 54% E-51 epoxy resin, 11% ethyl acetate, 10% cyclohexanone and 0.7% dibutyltin dilaurate, 12.3% polytetrafluoroethylene powder, then raise the temperature to 150°C, stir, and heat to reflux for 3 hours to obtain component A.

[0022] Preparation of component B: Add 26% polyamide curing agent, 28% graphite powder, 42% talcum powder and 4% asbestos fiber into the reaction kettle in sequence, then turn on the low-speed stirring and high-speed shearing functions at the same time, stir After 3 hours, component B was obtained.

[0023] Finally, mix A and B components evenly according to the ratio of 2:1 by weight to obtain a paste-like high-temperature-resistant thread grease. Apply the thread grease to the surface of the he...

example 3

[0028] Preparation of component A: first add 7% of phenyltriethoxysilane and 6% of methylcyclohexyldimethoxysilane into the reaction kettle, heat it while stirring so that the temperature reaches 70°C, and react for 3 hours Finally, in the process of stirring, add 50% E51 epoxy resin, 11% ethyl acetate, 10% cyclohexanone and 0.7% dibutyltin dilaurate, 15.3% PTFE powder, then raise the temperature to 150°C, stir, and heat to reflux for 3 hours to obtain component A.

[0029] Preparation of component B: Add 24% polyamide curing agent, 37% mica powder, 36% talc powder and 3% asbestos fiber into the reaction kettle in sequence, then turn on the low-speed stirring and high-speed shearing functions at the same time, stir After 3 hours, component B was obtained.

[0030] Finally, mix A and B components evenly according to the ratio of 2:1 by weight to obtain a paste-like high-temperature-resistant thread grease. Apply the thread grease to the surface of the heat-insulating pipe thre...

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Abstract

A special high temperature resistant thread grease for steam injection heat insulation pipes and a preparation method thereof. The thread grease is mainly used in heat insulation pipes of heavy oil thermal recovery wells, and still has good sealing and lubricating effects in high temperature environments. The present invention contains two components, A and B; among them, component A is: 5%~10% of phenyltriethoxysilane, 2%~7% of methylcyclohexyldimethoxysilane, E-51 ring Oxygen resin 45%~60%, ethyl acetate 7%~16%, cyclohexanone 5%~13%, dibutyltin dilaurate 0.2%~1.2%, polytetrafluoroethylene powder 10%~19%; group B It is divided into: polyamide curing agent 20%~30%, filler 59%~79%, asbestos fiber 1%~7%. The thread grease can meet the working condition requirements of heavy oil thermal recovery wells, can serve for a long time under the high temperature condition of 280°C, and play the role of auxiliary sealing; and has a good anti-sticking effect during breakout.

Description

technical field [0001] The invention relates to a high-temperature-resistant thread grease, which is mainly used in thermal insulation pipes of heavy oil thermal recovery wells, and still has good sealing and lubricating effects in high-temperature operating environments. Background technique [0002] my country is rich in heavy oil resources. At present, there are two main methods of heavy oil production: steam huff and puff and steam flooding. How to prevent heat loss during steam injection and ensure that high-temperature steam enters heavy oil reservoirs smoothly is a key issue in heavy oil production. Studies have shown that the threaded connection of the heat insulation pipe is the main part of heat loss. In order to prevent heat loss from the thread gap, thread grease will be applied to the surface of the thread before the heat insulation pipe is buckled to play the role of auxiliary sealing and lubrication. . However, the high temperature resistance of thread grease...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10C10M169/00C10N50/10C10N30/06
Inventor 贾江鸿陈明窦玉玲闫振来杨宁宁戴荣东姬丙寅王绪华
Owner CHINA PETROLEUM & CHEM CORP