Flushing liquid, preparation method thereof, and flushing liquid for deepwater cementing

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

Active Publication Date: 2019-10-18
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 liquid, preparation method thereof, and flushing liquid for deepwater cementing
  • Flushing liquid, preparation method thereof, and flushing liquid for deepwater cementing
  • Flushing liquid, preparation method thereof, and flushing liquid for deepwater 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 flushing liquid, a preparation method thereof, and flushing liquid for deepwater cementing, and belongs to the field of cementing operation. The flushing liquid is prepared from a diluent and a cleaning agent, wherein the mass ratio of the diluent to the cleaning agent is (75 to 95):(18 to 24); the diluent is prepared from water, sulfonated sodium tannin, sodium hexametaphosphate and hydroxyethyl cellulose, wherein the mass ratio of the water to the sulfonated sodium tannin to the sodium hexametaphosphate to the hydroxyethyl cellulose is (75 to 85):(8 to 12):(6 to 10):(1 to 4); and the cleaning agent is prepared from ethylene glycol, fatty alcohol-polyoxyethylene ether and octaphenyl polyoxyethyiene, and the mass ratio of the ethylene glycol to the fatty alcohol-polyoxyethylene ether to the octaphenyl polyoxyethyiene is (65 to 75):(15 to 25):(5 to 15). When being applied to the flushing liquid for deepwater cementing, the flushing liquid can dilute a mixed section of the flushing liquid for deepwater cementing and drilling liquid and/or cement slurry, slurry mixing of the cement slurry and the drilling liquid is effectively prevented, flocculation of the cement slurry is avoided, the thickening time is shortened, it is ensured that the mixed section has the good rheological property, false filter cakes of the drilling liquid, a casing and a well wall annulus are effectively flushed, and the flushing liquid can be applied to deepwater cementing operation at 0-30 DEG 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 Applications(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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