CN105315979A - Well cementation oil-based slurry flushing liquid and preparation method thereof - Google Patents
Well cementation oil-based slurry flushing liquid and preparation method thereof Download PDFInfo
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- CN105315979A CN105315979A CN201410363939.4A CN201410363939A CN105315979A CN 105315979 A CN105315979 A CN 105315979A CN 201410363939 A CN201410363939 A CN 201410363939A CN 105315979 A CN105315979 A CN 105315979A
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Abstract
The invention discloses a well cementation oil-based slurry flushing liquid and a preparation method thereof. The flushing liquid comprises the following components, by weight: 100 parts of water, 1-4 parts of a polymeric surfactant, and 1-3 parts of nano-grade attapulgite powder. The polymeric surfactant has a structural formula as show in the description. The particle diameter of the nano-grade attapulgite powder is 2-50nm. The preparation method comprises a step of well mixing the above components according to the formula. With the method, the well cementation oil-based slurry flushing liquid is obtained. The flushing liquid provided by the invention has good cleaning and displacement effects upon white-oil-based and diesel-based drilling fluids used in drilling. The oil-based drilling fluids for well drilling have high viscosity, such that an oil film is hard to clean during well cementation, and annulus displacement cannot be thoroughly performed. With the flushing liquid, the above problems can be effectively solved. The flushing liquid especially has good flushing effects upon drilling fluids with high plastic viscosity.
Description
Technical field
The present invention relates to petroleum drilling well cementation field, furtherly, relate to a kind of well cementation oil-based mud flushing liquor and preparation method.
Background technology
Borehole well instability brings certain difficulty to operations such as drilling well, geological logging, well logging and well cementation.Oil base drilling fluid is usually used in solving Mathematical Model sex chromosome mosaicism, and achieves good wellbore construction effect.But with regard to cementing operation, oil base drilling fluid can be trapped in interface and form slurry oil and oil film, this will have a strong impact on the interface cementing strength of cement mantle, reduce the sealing quality of cement mantle, therefore the washing fluid of high-efficiency rinsing effect will be injected with time before cementing operation, for cleaning the slurry oil, oil film and the mud cake that stick to interface, improving the cementing environment at annular space interface, ensureing the sealing quality of cement mantle.
More for the washing fluid kind of oil base drilling fluid at present.Application number be 02148985.8 Chinese patent " oil-based mud flushing liquor and preparation method thereof " disclose a kind of washing fluid comprising 2.5 ~ 3.5 parts of sodium hydroxide and 4.0 ~ 5.0 parts of ethylenediamine tetraacetic acid (EDTA)s and add 12.0 ~ 12.5 parts of oleic acid again, added in clear water and stirred 20-30 minute, and then add 2.0 ~ 2.2 parts of sodium lauryl sulphate and 5.0 ~ 5.5 parts of alkyl fatty polyoxyethylenated alcohol stir 55 ~ 65 minutes, finally add silicone antifoam agent again.
Application number be 01115908.1 Chinese patent " oil base mud well-cementing flushing fluid " disclose the washing fluid be made up of a kind of base oil and the Surfactant of two kinds of different molecular weights and a kind of Soxylat A 25-7 of alkylphenol, this washing fluid has good rinse capability to oil-base mud and mud cake, has significantly dilution viscosity reduction effect to oil-base mud simultaneously.
Washing fluid described by above prior art mainly adopts the tensio-active agent of small-molecular-weight as the main component of rinsing oil-base mud, and composition is comparatively complicated.This kind of washing fluid at high temperature its developing result is limited, and the surfactant-viscosified of small-molecular-weight, carries and cut DeGrain, can not effectively replace oil-base mud and rinse.
Summary of the invention
For solving produced problem in prior art, the invention provides a kind of well cementation oil-based mud flushing liquor and preparation method.Washing fluid of the present invention has certain shear force and viscosity, and composition is simple, plays the drag interaction to slurry oil and oil film under water conservancy machinery effect; Simultaneously washing fluid has very strong emulsifying effect, can effectively emulsification oil film and Residual oil, reaches the object of effectively cleaning toughening oil base drilling fluid.
An object of the present invention is to provide a kind of well cementation oil-based mud flushing liquor.
Comprise the following component with weight parts:
Water 100 weight part;
Polymeric surfactant 1 ~ 4 weight part; Be preferably 1-3 weight part;
Nano-attapulgite powder 1 ~ 3 weight part; Be preferably 1 ~ 2 weight part.
Described polymeric surfactant structural formula is
r group is-O (EO)
x(PO)
yr
1, n=5000 ~ 60000, x=2 ~ 10, y=2 ~ 10, R
1for-CH
2cH
2sO
3na or-CH
2cOONa; Preferred n=10000 ~ 30000, x=6 ~ 10, y=6 ~ 10, R
1for-CH
2cOONa;
The particle diameter of described nano-attapulgite powder in the middle of 2 ~ 50nm, between preferred 2-30nm.
Polymeric surfactant, as the tensio-active agent of a family macromolecule amount, has very strong emulsifying effect, can effectively emulsification oil film and Residual oil, significantly reduces its oil water interfacial tension; Meanwhile, higher molecular weight, makes its solution viscosity large, is beneficial to the replacement of slurry oil and pulling oil film, reach the effect of effectively rinsing oil-base mud.But not all polymeric surfactant can be applied to cementing operation as the composition of washing fluid.This mainly due to, during cementing operation, washing fluid can contact with cementing slurry, this require both consistency good, there will not be grout thickening, flocculation, dodge solidifying etc., affect the situation generation of safe construction.This just requires that polymeric surfactant is while performance washing action, and conventional with the existing cementing slurry admixture compatibleness of its structure type has conflicts, and affects cementing slurry traditional performance (not slow setting is not urged solidifying, do not affected dehydration etc.); Its molecular weight is in rational scope simultaneously, to grout not thickening.The present invention, through great many of experiments, filters out the polymeric surfactant of applicable casing and cementing feature, and forms well cementation oil-based mud flushing liquor as main component.
Described nano-attapulgite powder footpath is less, and suspension stability is good, makes washing fluid have certain shear force, further increases the drag interaction to slurry oil and oil film under water conservancy machinery effect.
Two of object of the present invention is to provide a kind of well cementation by the preparation method of oil-based mud flushing liquor.
Comprise:
Described component to be stirred obtained described well cementation oil-based mud flushing liquor by described consumption.
Washing fluid of the present invention, cleaning Flooding Efficiency preferably to using white oil base and diesel oil based drilling fluid to have in drilling well, effectively can clean oil base drilling fluid.Effectively can solve drilling well with this washing fluid uses oil base drilling fluid viscosity high, and oil film cleaning difficulty during well cementation, annular space replaces sordid problem, especially more obvious to the drilling fluid developing result that plastic viscosity is larger.
Embodiment
Below in conjunction with embodiment, further illustrate the present invention.
Nano-attapulgite powder: Changzhou Jiuchuan Nano Material Technology Co., Ltd.'s " high-purity Nano-class attapulgite clay ".
Polymeric surfactant: national fishing shelf, Dezhou, Shandong petroleum engineering technology company " poly table agent " DZB-151 (n=5000 ~ 10000, x=8 ~ 10, y=8 ~ 10, R
1=-CH
2cOONa), DZB-161 (n=10000 ~ 30000, x=6 ~ 8, y=6 ~ 8, R
1=-CH
2cOONa), DZB-171 (n=30000 ~ 60000, x=2 ~ 6, y=2 ~ 6, R
1=-CH
2cH
2sO
3na)
Example 1:
In the water of 100 weight parts, add the polymeric surfactant DZB-171 of 1 weight part, the nano-attapulgite powder (between particle diameter 30 ~ 50nm) of 2 weight parts, stir 60min, form uniform suspension liquid.
Example 2:
In the water of 100 weight parts, add the polymeric surfactant DZB-161 of 2.6 weight parts, the nano-attapulgite powder (between particle diameter 30 ~ 50nm) of 1 weight part, stir 60min, form uniform suspension liquid.
Example 3:
In the water of 100 weight parts, add the polymeric surfactant DZB-151 of 4 weight parts, the nano-attapulgite powder (particle diameter 2 ~ 30nm) of 2 weight parts, stir 60min, form uniform suspension liquid.
Example 4:
In the water of 100 weight parts, add the polymeric surfactant DZB-161 of 1 weight part, the nano-attapulgite powder (between particle diameter 2 ~ 30nm) of 3 weight parts, stir 60min, form uniform suspension liquid.
White oil base drilling fluid basic components is: base oil+2.8% primary emulsion+0.7% auxiliary emulsifying agent+2% organophilic clay+1% viscosity increaser+25%CaCl2 solution+2.5%CaO+2% fluid loss agent+3 ~ 5% plugging agent+water.
Diesel oil based drilling base is filled a prescription: auxiliary emulsifying agent+1% viscosity increaser+20%CaCl of base oil+3.5% organophilic clay+2.5% primary emulsion+0.9%
2solution+2%CaO+3% fluid loss agent+0.2% flow pattern regulator+2% plugging agent.
Be mixed with water oil ratio 90:10,80:20 and 70:30 tri-kinds of oil-base mud carry out irrigation tests.
The rheological data of table 1 different water oil ratio white oil base drilling fluid
The rheological data of table 2 different water oil ratio diesel oil based drilling fluid
Table 3 washing fluid is to the cleaning performance of different water oil ratio white oil base drilling fluid
Table 4 washing fluid is to the cleaning performance of different water oil ratio diesel oil based drilling fluid
From the experimental results, example 1 ~ 4, all effectively can rinse oil base drilling fluid well in a short period of time, along with the reduction of water oil ratio, the viscosity of oil base drilling fluid and shear force increase, and reach and oil base drilling fluid 100% is rinsed well, the time needing washing fluid to rinse is also longer.But can developing result be met based on the well cementation oil-based mud flushing liquor of polymeric surfactant.
Claims (4)
1. a well cementation oil-based mud flushing liquor, is characterized in that described washing fluid comprises the following component with weight parts:
Water 100 weight part;
Polymeric surfactant 1 ~ 4 weight part;
Nano-attapulgite powder 1 ~ 3 weight part;
Described polymeric surfactant structural formula is
r group is-O (EO)
x(PO)
yr
1, n=5000 ~ 60000, x=2 ~ 10, y=2 ~ 10, R
1for-CH
2cH
2sO
3na or-CH
2cOONa;
The particle diameter of described nano-attapulgite powder is in the middle of 2 ~ 50nm.
2. well cementation oil-based mud flushing liquor as claimed in claim 1, is characterized in that:
Described polymeric surfactant 1 ~ 3 weight part;
Described nano-attapulgite powder 1 ~ 2 weight part.
3. well cementation oil-based mud flushing liquor as claimed in claim 1, is characterized in that
N=10000 ~ 30000 in described polymeric surfactant, x=6 ~ 10, y=6 ~ 10, R
1for-CH
2cOONa;
The particle diameter of described nano-attapulgite powder is between 2 ~ 30nm.
4. a preparation method for the well cementation oil-based mud flushing liquor as described in one of claims 1 to 3, is characterized in that described method comprises:
Described component to be stirred obtained described well cementation oil-based mud flushing liquor by described consumption.
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| CN110484221A (en) * | 2019-09-16 | 2019-11-22 | 中国石油集团西部钻探工程有限公司 | Consolidate well oil-base mud insulating liquid and preparation method thereof |
| CN115141617A (en) * | 2021-03-31 | 2022-10-04 | 中国石油化工股份有限公司 | Tackifying and cutting-off agent, oil-based mud flushing fluid, and preparation method and application thereof |
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| CN110484221A (en) * | 2019-09-16 | 2019-11-22 | 中国石油集团西部钻探工程有限公司 | Consolidate well oil-base mud insulating liquid and preparation method thereof |
| CN115141617A (en) * | 2021-03-31 | 2022-10-04 | 中国石油化工股份有限公司 | Tackifying and cutting-off agent, oil-based mud flushing fluid, and preparation method and application thereof |
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| CN105315979B (en) | 2018-05-29 |
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