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API oil sleeve thread sealing grease composite and preparation method thereof

A technology of thread sealing and composition, which is applied in the field of API oil casing thread sealing grease composition and its preparation, which can solve the problems of easy blockage of pipelines, difficulty in painting operation, and easy corrosion of threads, etc., and achieves good effect and good sealing effect. Excellent performance and high anti-rust performance

Active Publication Date: 2009-10-28
TIANJIN PIPE GROUP CORP
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

At the end of the 1990s, my country successfully developed thread sealant with independent intellectual property rights, but the following shortcomings were exposed in the long-term use process: it is easy to block the pipeline at low temperature, and it is difficult to paint; Prone to rust, resulting in annual economic losses of more than ten million yuan

Method used

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  • API oil sleeve thread sealing grease composite and preparation method thereof

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preparation example Construction

[0023] The preparation method of the above-mentioned API oil casing thread sealant composition comprises the following steps:

[0024] ① Preparation of base fat

[0025] The base grease includes 91% of low-temperature synthetic lithium complex grease and 9% of anti-rust additives by weight. The low-temperature synthetic lithium complex grease includes 12-hydroxystearic acid, 0.93% sebacic acid, 0.17% boric acid, 0.98% lithium hydroxide, and 85.15% α-olefin oil accounting for 3.77% of the base fat weight, of which saponification oil accounts for 28.39% %, thickening oil accounts for 28.39%, blending oil accounts for 28.37%, and is prepared by one-step pressurized saponification process. Add 3.77% 12-hydroxystearic acid, 0.93% sebacic acid, 0.17% boric acid, 0.98% lithium hydroxide aqueous solution and 28.39% α-olefin oil into the saponification tank, control the saponification pressure to 294kPa, and the temperature to 145-150°C. The saponification time is 2.5 to 3 hours. Ad...

Embodiment

[0034] The API oil casing thread sealant of the present invention is made of 00# base grease accounting for 42% of the sealant composition weight, 5% of 201-350# dimethyl silicone oil, 20% of 325 order flake graphite powder, and 8% 400 mesh polytetrafluoroethylene, 0.7% expanded graphite powder (expansion factor is 200 times), 1.3% 325 mesh white carbon black, 4% 325 mesh sericite powder, 4% 400 mesh light calcium carbonate, 15 % of 325 mesh tin bronze powder composition. The preparation method is as follows: as mentioned above, first add 28% of 00# base grease, 0.7% expanded graphite powder, and 5% simethicone oil, stir and mix in a mixer for 15-20 minutes, and filter through a colloid mill. Then add 20% flake graphite powder, 8% polytetrafluoroethylene, 1.3% white carbon black, 4% sericite powder, 4% light calcium carbonate, 15% tin bronze powder and 14% 00# base grease, and continue stirring 80-90 minutes. Grind and filter through a colloid mill, and pack to obtain the pr...

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Abstract

The invention provides an API oil sleeve thread sealing grease composite. The components of the composite include 40-50 percent of basic grease, 5-10 percent of dimethyl silicon oil, 16.5-20 percent of crystalline graphite powder, 6-9 percent of polyfluortetraethylene, 0.5-1.0 percent of expansion graphite powder, 1-2 percent of white carbon black, 3-4 percent of sericite in powder, 3-4 percent oflight calcium carbonate and 10-15 percent of tin bronze powder according to the percentage accounting for in the weight of the sealing grease composite. The invention also provides a preparation method of the API oil sleeve thread sealing grease composite. The invention has the beneficial effects that among the components of the sealing grease composite, synthetic oil is taken as a substitute formineral oil, and therefore the low temperature fluidity of the basic grease is improved to facilitate the brush application in winter. The addition of high performance antirust to the basic grease ensures that pipe threading does not rust when oil sleeves and pipes are stored outside in long term. Without zinc powder added but with the consumption of copper powder increased and other wear-resistant materials added, the high temperature lubricity of the grease is guaranteed and the pipe threading of the oil sleeves and pipes is prevented from thread gluing when screwing together. With novel high efficiency sealing materials added in the components of the sealing grease composite, the leak tightness of the grease is guaranteed.

Description

technical field [0001] The invention relates to the petroleum and natural gas industry, and relates to an API thread sealing grease composition for oil casing and a preparation method thereof. Background technique [0002] Oil casing tubing is the main consumable pipe material for oil production. When the oil casing tubing is connected, the end threads must be coated with thread sealant to ensure the tightness and connection strength of the oil casing connection. At the end of the 1990s, my country successfully developed the thread sealant with independent intellectual property rights, but the following shortcomings were exposed in the long-term use process: it is easy to block the pipeline at low temperature, and the brushing operation is difficult; the thread of the oil casing oil pipe It is prone to rust, and the economic loss caused by it is more than ten million yuan every year. [0003] So far, my country still needs to import part of thread sealant and storage grease....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10M105/80C10M141/08C09K3/10C10N30/06C10N30/12C10N50/10
Inventor 李霞荣连泉迟玮封紫艳陈冬良于凤云
Owner TIANJIN PIPE GROUP CORP
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