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Flushing fluid and preparation method thereof, flushing fluid for deep water well cementing

A technology of flushing fluid and cleaning agent, which is applied in the field of deepwater cementing flushing fluid, which can solve the problems of poor cleaning effect of drilling fluid, achieve good dilution and flushing effect, good rheology, and quality assurance

Active Publication Date: 2021-09-28
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The flushing fluid provided by related technologies has poor cleaning effect on drilling fluid at 0-30°C

Method used

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  • Flushing fluid and preparation method thereof, flushing fluid for deep water well cementing
  • Flushing fluid and preparation method thereof, flushing fluid for deep water well cementing
  • Flushing fluid and preparation method thereof, flushing fluid for deep water well cementing

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preparation example Construction

[0042] On the other hand, an embodiment of the present invention provides a method for preparing a flushing solution, the preparation method is applied to any of the above-mentioned flushing solutions, and the preparation method includes:

[0043] According to the mass ratio of each component, water is added into the first reactor, and then in the stirring state, sulfonated tannin, sodium hexametaphosphate, and hydroxyethyl cellulose are sequentially added to the first reactor to control the second reactor. The temperature of a reactor is the first preset temperature, and the diluent is obtained by stirring for the first preset time.

[0044] In the second reactor, add ethylene glycol, then in the stirring state, add fatty alcohol polyoxyethylene ether and octylphenol polyoxyethylene ether in the second reactor, control the temperature of the second reactor to be the second preset Set the temperature and stir for a second preset time to obtain a cleaning agent.

[0045] Stir ...

Embodiment 1

[0065] This embodiment provides a flushing solution, which is prepared by the following method:

[0066] Add 75 parts by weight of water into the first reaction kettle, open the agitator, then add 8 parts by weight of sulfonated tannin, 6 parts by weight of sodium hexametaphosphate, and 1 part by weight of hydroxyl Ethyl cellulose was stirred at 37°C for 35 minutes to obtain a diluent.

[0067] Add the ethylene glycol of 65 weight parts in the second reactor, open agitator, then add the fatty alcohol polyoxyethylene ether of 15 weight parts and the octylphenol polyoxyethylene ether of 5 weight parts in the second reactor, Stir at 32°C for 35 minutes to obtain a cleaning agent.

[0068] Stir the above diluent and cleaning agent evenly to obtain the rinsing solution provided in this embodiment.

Embodiment 2

[0070] This embodiment provides a flushing solution, which is prepared by the following method:

[0071] Add 80 parts by weight of water to the first reactor, start the agitator, and then add 10 parts by weight of sulfonated tannin, 8 parts by weight of sodium hexametaphosphate, and 2 parts by weight of hydroxyl Ethyl cellulose was stirred at 40°C for 40 minutes to obtain a diluent.

[0072] Add 70 parts by weight of ethylene glycol in the second reactor, open the agitator, then add 20 parts by weight of fatty alcohol polyoxyethylene ether and 10 parts by weight of octylphenol polyoxyethylene ether in the second reactor, Stir at 35°C for 40 minutes to obtain a cleaning agent.

[0073] Stir the above diluent and cleaning agent evenly to obtain the rinsing solution provided in this embodiment.

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Abstract

The invention discloses a flushing fluid, a preparation method thereof, and a flushing fluid for deep water well cementing, which belong to the field of well cementing operations. The flushing solution includes: diluent and cleaning agent; the mass ratio of diluent to cleaning agent is 75-95:18-24; the diluent includes: water, sulfonated tannin, sodium hexametaphosphate, and hydroxyethyl cellulose; The mass ratio of water, sulfonated tannin, sodium hexametaphosphate, and hydroxyethyl cellulose is 75-85:8-12:6-10:1-4; cleaning agents include: ethylene glycol, fatty alcohol polyoxyethylene Ether, octylphenol polyoxyethylene ether; mass ratio of ethylene glycol, fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether is 65-75:15-25:5-15. When the flushing fluid is applied to the flushing fluid for deepwater well cementing, it can dilute the mixing section with drilling fluid and / or cement slurry, effectively prevent cement slurry and drilling fluid from mixing, avoid cement slurry flocculation, shorten the thickening time, and ensure mixing The section has good rheological properties, effectively flushes the virtual mud cake of drilling fluid, casing and borehole wall annulus, and can be applied in deepwater cementing operations at 0-30°C.

Description

technical field [0001] The invention relates to the field of cementing operations, in particular to a flushing fluid, a preparation method thereof, and a flushing fluid for deepwater well cementing. Background technique [0002] Oil and gas resources in the deep water field account for a large proportion of the total oil and gas reserves, such as the hydrate layer (such as methane) deposited on the bottom of the deep water. However, the ambient temperature in deep water is low, the formation is soft, the fracture pressure is low, and fluid movement is easy to occur. Therefore, deep water cementing operation is a key link in oil and gas production. In deepwater cementing operations, it is necessary to use cement slurry to displace the drilling fluid. After the cement slurry solidifies, it can support the casing and seal the formation between the well wall and the casing. Moreover, before pumping the cement slurry, the drilling fluid needs to be cleaned with flushing fluid to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 谢飞燕邹建龙涂思琦曾建国张其滨宋有胜辛海鹏邹双敖康伟杨昆鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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