CN110305641A - A kind of modified fluid loss agent - Google Patents
A kind of modified fluid loss agent Download PDFInfo
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- CN110305641A CN110305641A CN201910644209.4A CN201910644209A CN110305641A CN 110305641 A CN110305641 A CN 110305641A CN 201910644209 A CN201910644209 A CN 201910644209A CN 110305641 A CN110305641 A CN 110305641A
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- Prior art keywords
- fluid loss
- bentonite
- loss agent
- cement
- cement slurry
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
Abstract
The invention discloses a kind of modified fluid loss agents, are related to cement slurry outer-penetrating agent technical field.The present invention comprises the following components in parts by weight: polyamide polymers 40%-65%；Bentonite: 0-20%；Calcium carbonate superfine powder: 20%-45%；Aluminum sulfate: 5%-10%；The polyamide polymers are the copolymer of 2-acrylamide-2-methyl propane sulfonic acid and acrylamide (AMPS/AM).Easily mix that dehydration is low, intensity is high, anti-salt property and good rheological property, gel strength are high, the good cement slurry of thixotropic property using fluid loss agent of the present invention.
Description
Technical field
The present invention relates to cement slurry outer-penetrating agent technical fields, more particularly to one kind to cement the well for petroleum, gas drilling
The fluid loss agent that cement slurry water loss amount is reduced in journey, more specifically to a kind of modified fluid loss agent.
Background technique
Fluid loss agent is the very important additive of cementing concrete, in cementing operation, can improve cement filter cake texture
It is allowed to be formed filter cake fine and close, that permeability is low to reduce fluid loss, guarantees density, rheological characteristic, thickening time of cement slurry etc.
Meet design requirement, while cement slurry water loss being avoided to pollute and injure caused by oil reservoir.
The fluid loss agent that oil field uses at present has aqua and two kinds of pulvis, and cement consumption is bigger than normal, and the cost is relatively high, aqua
Type fluid loss agent is after mixed water, it usually needs carries out multiple cement slurry test, heavy workload and time-consuming；Mixed water process needs people
Work charging and water pump circulation are mixed, large labor intensity and energy consumption height.Powder-type fluid loss agent can be with cement when mixing ash at the scene
It is uniformly mixed, easy construction and effect is good；In addition the transportation cost of aqua fluid loss agent is higher.
In the fluid loss agent of powder-type, polyamide-based copolymer fluid loss agent is also usually occurred using relatively broad
Early strength and thickening time, the bad situation of thixotropic property are influenced, fluid loss agent of the invention was intended to reduce to the thickening time
And the influence of intensity, and the thixotropic property of cement slurry is improved, improve well cementation efficiency.It is easily deployed using fluid loss agent of the present invention
Dehydration is low out, intensity is high, anti-salt property and good rheological property, gel strength are high, the good cement slurry of thixotropic property.
Summary of the invention
In order to overcome above-mentioned defect existing in the prior art and deficiency, this application provides a kind of modified fluid loss agent,
The modification fluid loss agent of the application is intended to reduce the influence to thickening time and intensity, and improves the thixotropy of cement slurry
Can, improve well cementation efficiency.Using fluid loss agent of the present invention easily mix dehydration is low, intensity is high, anti-salt property and good rheological property,
Gel strength is high, the good cement slurry of thixotropic property.
In order to solve above-mentioned problems of the prior art, the application is achieved through the following technical solutions:
A kind of modified fluid loss agent, it is characterised in that: comprise the following components in parts by weight:
Polyamide polymers 40%-65%；
Bentonite: 0-20%；
Calcium carbonate superfine powder: 20%-45%;
Aluminum sulfate: 5%-10%；
The polyamide polymers are the copolymerization of 2-acrylamide-2-methyl propane sulfonic acid and acrylamide (AMPS/AM)
Object.
Further, bentonite is sodium bentonite, wherein smectite content > 75%.
Further, calcium carbonate superfine powder partial size is 1000-2000 mesh.
Fluid loss agent of the invention can reduce the influence to thickening time and intensity, and improve the thixotroping of cement slurry
Performance improves well cementation efficiency.
Compared with prior art, the beneficial technical effect that the fluid loss agent of the application has is shown:
1, make fluid loss agent that there is preferably drop dehydration and anti-salt property using bentonite in the copolymer of AMPS/AM.Bentonite
Enter filter cake with minimum particle and be embedded between cement granules, to keep filter cake texture fine and close, permeability reduction can be reduced
Dehydration can be used for 135 DEG C of high temperature；Behavior of Hardened Cement Paste after solidification has good resistance to the erosion of sulfate or other salts.
2, further select bentonite for sodium bentonite, the degree of scatter of sodium bentonite is high, and water absorption rate is high, expands
Multiple is big, the sodium ion adsorbed water molecule between bentonitic synusia, and is full of hydrone between layer and layer, makes these synusia
It separates, forms expansion, after a certain amount of hydrone of bentonite surface Cation adsorption of aquation, bentonite forms gel, energy
Enough improve is that filter cake is finer and close, reduces permeability, controls dehydration.Bentonitic expansion character and the content of wherein montmorillonite have
It closes, smectite content > 75% can preferably realize bentonitic expansion character.
3, AMPS/AM copolymer itself has deferred action, and aluminum sulfate is a kind of common coagulant, drops dehydration in pulvis
It is suitably added aluminum sulfate in agent, can play the role of adjusting cement slurry thickening time, this is because ionic effect, coagulant changes
The solubility of cementing material, and it is not involved in chemical reaction, mortar architecture intermediate ion concentration increases, and changes cement particle surface
Adsorption layer reduces zeta potential, and cohesiveness increases, and accelerates the aquation of cement.Under same concentrations, high-valence cationic can be swapped out
Cation at a low price, if ion concentration is high, cation can also be swapped out high-valence cationic at a low price.It is such as added sufficient concentrations of low
Valence cationic polyelectrolyte can make Al+ be swapped out the Ca+ of adsorption layer, to accelerate hydrated cementitious, reach blood coagulation enhancing effect to avoid
There is the phenomenon that slow setting after fluid loss agent is added.And it can be improved the early Qiang Qiangdu of Behavior of Hardened Cement Paste.
4, aluminum sulfate is also common thixotropic agent in cement slurry, after aluminum sulfate is added in cement slurry, the touching of cement slurry
Denaturation greatly increases, and gel strength increases.I.e. cement slurry is dilute fluid in mixing and displacement process, after pumping stops, and energy
Quickly form a kind of special cement of the jelling structure of rigidity (itself can support).
5, AMPS/AM copolymer itself has stronger drag reduction, and the calcium carbonate superfine powder of 1000-2000 mesh is mixed into pulvis drop
After dehydration agent product, in the identical ratio of mud, water requirement of the fluid loss agent in cement slurry can be increased, it is heavy to increase
Stability is dropped, free liquid is reduced, avoids the lamination generated because cement slurry is excessively dilute, guarantee that cementing operation is normally carried out.
6, in addition the incorporation of superfine CaCO-3 promotes the hydration heat rate of cement, and hydration heat also increases therewith, with
Superfine CaCO-3 volume increases, and 2 content of Ca (OH) that silicate cement hydration generates all increases with chemically combined water content, mixes
The anti-folding and compression strength of superfine CaCO-3 cement-based material improve.Result of study shows that superfine CaCO-3 accelerates portland cement
Aquation.It avoids the occurrence of after cement slurry is added in fluid loss agent and the phenomenon that strength retraction occurs.
7, calcium carbonate superfine powder can also improve the anti-salt property of fluid loss agent, since calcium carbonate can absorb Cl- in salt water,
The content of Cl- is reduced, while reducing brine strength, it can be in the anti-salt property for increasing fluid loss agent to a certain degree.
8, the AMPS/AM copolymer-bentonite-aluminum sulfate system of the application, can preferably control dehydration: polyamide-based
Polymer one end is adsorbed on bentonite clay particle surface by bentonitic gap, and the other end, which is dissolved in water, makes bentonite clay particle and moisture
A kind of indirectly connection is produced between son.A kind of bridge linking effect is formd, reduces the Free water in mud, changes mud
Performance parameter, achieve the purpose that reduce leak-off rate.
9, after bentonite-aluminum sulfate-water mixing, the variation of bentonite microparticles surface charge, aluminium ion replaces sodium ion
So that the surface charge of soil becomes more negative.Followed by aluminium salt and water formation Al-OH key, partial insertion sodium bentonite interlayer,
Lamella the phenomenon that digging is generated, and most of instead of sodium, has been connected to bentonite surface, by the stirring with cement slurry, from
Son exchange, crack and the hole of sodium bentonite increase.The increase of the variation of surface charge, crack and interlamellar spacing, can be more preferable
The bentonitic physics of system, chemical adsorption capacity, make polymer adsorbed close in particle surface, form bridge linking effect.
10, the application with cement slurry in use, fluid loss can control in 50ml or less；It is 15% He in mass concentration
It, can be by Filtrate Loss Control within 50ml when fluid loss agent volume is 2.0% and 2.5% in 25% sodium chloride solution；This Shen
Fluid loss agent adaptive temperature range please is wide, can use within the scope of 40-95 DEG C；The fluid loss agent of the application has good
Anti-salt property, salinity reach 0 ~ 40000mg/L；The thickening curve smoothing of the cement slurry of the fluid loss agent of the application is added, it is thick
The change time is adjustable, and transit time is shorter, nearly short transient time, and fluid loss agent will not adversely affect cement strength.
Compared with AMPS/AM copolymer fluid loss agent, early strength can be improved, and can be improved gel strength.
At the scene in use process, single use inorganic material fluid loss additive or organic material fluid loss additive all exist
Some problems.In the fluid loss agent of powder-type, AMPS/AM copolymer fluid loss agent is also usually occurred using relatively broad
Influence early strength and thickening time, the bad situation of thixotropic property；Using the inorganic fluid loss additive such as swelled ground, cost is relatively low, energy
High temperature resistant, but the effect for controlling dehydration does not have organic material obvious.The present invention uses inorganic material in conjunction with organic material,
AMPS/AM copolymer one end is adsorbed on bentonite clay particle surface by bentonitic gap, and the other end, which is dissolved in water, makes bentonite
A kind of indirectly connection is produced between grain and hydrone.A kind of bridge linking effect is formd, reduces the Free water in mud, changes
The performance parameter for having become mud achievees the purpose that reduce leak-off rate.
AMPS/AM copolymer-bentonite-aluminum sulfate-calcium carbonate system fluid loss additive, is an entirety, single component
It can not achieve advantages of the present invention.Bentonite, aluminum sulfate, calcium carbonate can be used as extra material or outer as single component
Add agent to be added in cement, realizes that cement slurry is early strong, the performances such as expansion.It is used alone and the mechanism of action is applied in combination with of the invention
It is different.1) bentonite, aluminum sulfate, calcium carbonate are added in cement or concrete as one-component, usually with cement
Grain is had an effect, and is brought about the desired effect.2) bentonite, aluminum sulfate, calcium carbonate as single component be added to cement or
In concrete, the mechanism of action from be applied in combination it is different using mechanism.After aluminum sulfate can be used as coagulant incorporation concrete, with
Gypsum in portland cement combines, and hampers the generation of calcium sulphoaluminate around cement particle, to keep tricalcium aluminate rapid
Rapid hardening is played the role of in condensation, improves early strength.In the filtrate reducing system of the invention, the not only system rush of aluminum sulfate
Solidifying effect, it is often more important that after bentonite-aluminum sulfate-water mixing, the variation of bentonite microparticles surface charge, aluminium ion replaces
Sodium ion makes the surface charge of soil become more negative.Followed by aluminium salt and water form Al-OH key, partial insertion Na-bentonite
Between soil layer, generate lamella the phenomenon that digging, and most of instead of sodium, be connected to bentonite surface, by with cement slurry
Stirring, ion exchange, crack and the hole of sodium bentonite increase.The increase of the variation of surface charge, crack and interlamellar spacing, energy
It is enough preferably to embody bentonitic physics, chemical adsorption capacity, make polymer adsorbed close in particle surface, forms bridging and make
With.Bridge linking effect reduces the Free water in mud, changes the performance parameter of mud, achievees the purpose that reduce leak-off rate.3)
Calcium carbonate superfine powder is added in cement, can be improved intensity, but is not in the present invention only to use ultra-fine carbonic acid
Calcium improves the performance of intensity, and mainly calcium carbonate superfine powder can also improve the anti-salt property of fluid loss agent, since calcium carbonate can
Cl- in salt water is absorbed, reduces the content of Cl-, while reducing brine strength, it can be in the salt resistance for increasing fluid loss agent to a certain degree
Performance.
Detailed description of the invention
Fig. 1 is the thickening experimental result of the cement slurry of embodiment 7.
Specific embodiment
Experiment condition: cement-slurry method: cement-slurry method be all made of cement-slurry method be good magnificent G-level high oil-resistant well cement+
2% retarder SD210+0.2% defoaming agent SD52+ fluid loss agent, the ratio of mud 0.44.Fluid loss agent is suitable according to different proportion relationship
Match, adjust volume, retarder, defoaming agent depending on the temperature, fluid loss agent, which is all made of outside fixed, mixes percentage.
Experimental method: cement strength, fluid loss are tested using GB/T 19139-2012.It is surveyed using gel strength method
Determine the thixotropy of cement slurry.Cement slurry is prepared according to experimental standard GB/T 19139-2012, normal pressure thickening is put into after the completion of preparing
It is carried out in instrument prefabricated.After the completion of cement slurry is prefabricated, tested using gel strength method.
Gel strength method: with the blade of special shape, (the about 1s- when shear rate is close to zero
1) static 10 s and 10 min of cement slurry, is measured, slurry starts the gel strength τ of flowing1And τ10, with its difference DELTA τ=τ10-
τ1Indicate the thixotropy size of cement slurry.
Specific embodiment is as follows:
Embodiment 1
AMPS/AM copolymer 45%, bentonite 15%, calcium carbonate superfine powder 35%, aluminum sulfate 5%, drop dehydration by 40 DEG C of test temperature temperature
Agent volume 1.5%.
Embodiment 2
Dehydration drops in AMPS/AM copolymer 45%, bentonite 8%, calcium carbonate superfine powder 42%, aluminum sulfate 5%, test temperature temperature 60 C
Agent volume 1.5%.
Embodiment 3
Dehydration drops in AMPS/AM copolymer 40%, bentonite 20%, calcium carbonate superfine powder 37%, aluminum sulfate 3%, test temperature temperature 60 C
Agent volume 1.5%.
Embodiment 4
AMPS/AM copolymer 65%, bentonite 8%, calcium carbonate superfine powder 20%, aluminum sulfate 7%, drop dehydration by 80 DEG C of test temperature temperature
Agent volume 1.5%.
Embodiment 5
AMPS/AM copolymer 55%, bentonite 4%, calcium carbonate superfine powder 36%, aluminum sulfate 5%, drop dehydration by 80 DEG C of test temperature temperature
Agent volume 1.5%.
Embodiment 6
AMPS/AM copolymer 65%, calcium carbonate superfine powder 25%, aluminum sulfate 10%, 100 DEG C of test temperature temperature, fluid loss agent volume
2.0%。
Embodiment 7
AMPS/AM copolymer 50%, bentonite 18%, calcium carbonate superfine powder 22%, aluminum sulfate 10%, 100 DEG C of test temperature temperature, drop is lost
Aqua volume 2.0%.
The experimental data are shown in the following table:
By experimental data it is found that the fluid loss agent of the application is added in cement according to a certain percentage, in 40 DEG C of -95 DEG C of ranges
Interior, intensity is higher for 24 hours, and fluid loss < 100ml can be improved the gel strength of cement slurry, and cement slurry thixotropic property is preferable, is entirely capable of
Enough meets the needs of scene well cementation.
Referring to attached drawing 1, attached drawing 1 is the thickening experimental result of the present embodiment cement slurry, and experimental temperature is 100 DEG C, experiment pressure
Power is 60.5 MPa, and the heating-up time is 48 min.As seen from the figure, the thickening curve smoothing of cement slurry, thickening time are 265 min
And the thickening time is adjustable, transit time is shorter, nearly short transient time, shows the curing time section after cement slurry is pumped to pit shaft, by force
Degree development is fast, is conducive to quick sealing wellbore.
Claims (3)
1. a kind of modified fluid loss agent, it is characterised in that: comprise the following components in parts by weight:
Polyamide polymers 40%-65%；
Bentonite: 0-20%；
Calcium carbonate superfine powder: 20%-45%;
Aluminum sulfate: 5%-10%；
The polyamide polymers are the copolymerization of 2-acrylamide-2-methyl propane sulfonic acid and acrylamide (AMPS/AM)
Object.
2. a kind of modified fluid loss agent as described in claim 1, it is characterised in that: bentonite is sodium bentonite, wherein covering
De- stone content > 75%.
3. a kind of modified fluid loss agent as claimed in claim 1 or 2, it is characterised in that: calcium carbonate superfine powder partial size is 1000-
2000 mesh.
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| CN201910644209.4A CN110305641A (en) | 2019-07-17 | 2019-07-17 | A kind of modified fluid loss agent |
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Cited By (3)
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| CN111139041A (en) * | 2019-12-06 | 2020-05-12 | 山东祺龙海洋石油钢管股份有限公司 | DTF mud |
| CN111718149A (en) * | 2020-07-28 | 2020-09-29 | 中海石油(中国)有限公司湛江分公司 | Oil well cement low-viscosity thixotropic agent and preparation method thereof |
| CN111807747A (en) * | 2020-07-27 | 2020-10-23 | 中国石油大学(华东) | Cement water replenishing shrinkage-proof agent and preparation method and application thereof |
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| CN111807747A (en) * | 2020-07-27 | 2020-10-23 | 中国石油大学(华东) | Cement water replenishing shrinkage-proof agent and preparation method and application thereof |
| CN111718149A (en) * | 2020-07-28 | 2020-09-29 | 中海石油(中国)有限公司湛江分公司 | Oil well cement low-viscosity thixotropic agent and preparation method thereof |
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