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Modified sulphurized asphalt used for drilling fluid and preparation method thereof,

A technology of sulfonated asphalt and drilling fluid, which is applied in the direction of chemical instruments and methods, processing tar asphalt/petroleum asphalt/natural asphalt, drilling compositions, etc., which can solve unfavorable drilling operations, drilling fluid foaming, In order to improve the performance of high temperature and high pressure fluid loss, increase lubricity, inhibit expansion and dispersion, etc.

Active Publication Date: 2013-07-03
河南金马石油科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of sulfonated asphalt is small, the effect of reducing high-temperature and high-pressure fluid loss is poor; when the amount is large, the drilling fluid is prone to foaming, which is not conducive to drilling operations

Method used

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  • Modified sulphurized asphalt used for drilling fluid and preparation method thereof,

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preparation example Construction

[0025] The present invention also provides a preparation method of modified sulfonated asphalt for drilling fluid, comprising the following steps:

[0026] a) mixing medium temperature coal tar pitch, kerosene and fuming sulfuric acid to obtain sulfonated medium temperature coal tar pitch after reaction;

[0027] b) mixing the sulfonated medium-temperature coal tar pitch and high-temperature hard coal tar pitch to obtain a modified sulfonated pitch for drilling fluid.

[0028] The invention uses medium-temperature coal tar pitch and high-temperature hard coal pitch as raw materials to prepare modified sulfonated pitch, and the obtained modified sulfonated pitch has good high-temperature and high-pressure fluid loss reduction performance.

[0029] In the present invention, the softening point of the medium temperature coal tar pitch is preferably 75°C to 95°C, more preferably 80°C to 90°C; the dissolution rate of the medium temperature coal tar pitch in carbon tetrachloride is ...

Embodiment 1

[0043] Add 14g of benchmark sodium bentonite to 350mL of distilled water, stir at a speed of 11000r / min for 20min, scrape off the adherents adhering to the container wall with a glass rod during the stirring process; after stirring, seal the obtained mixture for 24h, and then Add 7.0g of iron-chromium lignosulfonate and 7.0g of evaluation soil, stir for 30min, adjust the pH value to 10 with 20% sodium hydroxide solution, stir at 11000r / min for 20min to obtain the base slurry.

Embodiment 2

[0045] Pulverize the medium-temperature coal tar pitch to 20 mesh, and pass through a 20-mesh standard inspection sieve to obtain medium-temperature coal tar pitch particles; add 150 g of the medium-temperature coal tar pitch to the kneader, add 5 g of kerosene under stirring, and knead for 10 minutes; Add 45gSO under the condition 3 Fuming sulfuric acid with a content of 25wt%, kneading for 30min; the obtained reaction mixture was naturally air-dried and crushed to 20 mesh, and passed through a 20 mesh standard inspection sieve to obtain acidic sulfonated asphalt particles; Add the acidic sulfonated asphalt particles into the sodium hydroxide solution, stir and neutralize for 30 minutes to obtain the sulfonated asphalt colloid; dry the sulfonated asphalt colloid in a drying room at 140°C for 48 hours, crush it to 40 mesh, pass 40-mesh standard inspection sieve to obtain sulfonated asphalt particles;

[0046] Crush the high-temperature hard coal tar pitch to 40 mesh, and pass...

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Abstract

The invention provides modified sulphurized asphalt used for drilling fluid, and the sulphurized asphalt comprises the high temperature hard coal-based asphalt and the sulphurized medium temperature coal-tar asphalt, The invention also provides a preparation method of the modified sulphurized asphalt used for drilling fluid, and the method comprises the following steps: a) mixing the medium temperature coal-tar asphalt, kerosene and fuming sulfuric acid, reacting a mixture to obtain the sulphurized medium temperature coal-tar asphalt; b) mixing the sulphurized medium temperature coal-tar pitch with high temperature hard coal-based asphalt to obtain the modified sulfonated asphalt used for drilling fluid. wherein the colloid content in the medium temperature coal-tar asphalt is low so thatthe medium temperature coal-tar asphalt is easy to be sulphurized by a sulfonating agent, the obtained the by-product such as sodium sulfate and the like in the sulphurized asphalt is little and the filtrate reduction effect is good. The high temperature resistance performance and stability of the high temperature hard coal-based asphalt is good which is capable of raising the filtrate reduction property of the modified sulphurized asphalt. Experiments show that 2% of the drilling fluid prepared by the modified sulphurized asphalt added in basic slurry enables 10mL-12mL of the filtrate reduction amount under high-temperature and high-pressure, the filtrate reduction amount of the modified sulphurized asphalt under high-temperature and high-pressure is lower than that of the sulphurized asphalt and emulsified asphalt.

Description

technical field [0001] The invention belongs to the technical field of sulfonated asphalt, in particular to a modified sulfonated asphalt for drilling fluid and a preparation method thereof. Background technique [0002] In the process of oil drilling, in order to keep the well diameter regular and prevent collapse, it is necessary to add mud treatment agent with anti-slump function to the mud to improve the performance of the mud and achieve the purpose of stabilizing the well wall, especially in complex formations, deep wells and hot wells In drilling, the mud treatment agent should not only have anti-slump performance but also high temperature resistance. Modified asphalt has the functions of preventing collapse, reducing the high-temperature and high-pressure filtration loss of drilling fluid, and improving the high-temperature stability of mud, and is widely used as a mud treatment agent. [0003] The prior art discloses a variety of modified asphalts for drilling flui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C10C3/02C09K8/035
Inventor 马礼俊赵善波雷恒永姚杰王忠交
Owner 河南金马石油科技有限责任公司
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