CN105271962B - The cement mortar and preparation method thereof of the big temperature difference saline bed well cementation of long cementing interval - Google Patents
The cement mortar and preparation method thereof of the big temperature difference saline bed well cementation of long cementing interval Download PDFInfo
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- CN105271962B CN105271962B CN201510617835.6A CN201510617835A CN105271962B CN 105271962 B CN105271962 B CN 105271962B CN 201510617835 A CN201510617835 A CN 201510617835A CN 105271962 B CN105271962 B CN 105271962B
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Abstract
The invention discloses a kind of cement mortars and preparation method thereof of the big temperature difference saline bed well cementation of long cementing interval, are related to casing and cementing field, solve the problems, such as that cement mortar comprehensive performance in the big temperature difference saline bed of long cementing interval is poor.The cement mortar of the present invention is by following material composition：100 parts of oil-well cement, 8 15 parts of high-temperature stabilizer, 10 20 parts of palliative, 14 parts of fluid loss agent, 0.5 2 parts of dispersant, 0.5 2 parts of suspension stabilizer, 13 parts of agent for anti gassing-out, 13 parts of intensity adjustment agent, 0.5 2 parts of fiber, 77 100 parts of the sodium chloride solution that mass concentration is 18%, 0.5 2 parts of retarder, 0.1 0.3 parts of antifoaming agent.Cement mortar using the present invention has the advantages that high temperature resistance, salt resistance and anti-gas channeling ability are strong in the big temperature difference saline bed well cementation of long cementing interval.
Description
Technical field
The present invention relates to reinforcing oil well engineering field more particularly to a kind of water of the big temperature difference saline bed well cementation of long cementing interval
Mud and preparation method thereof.
Background technology
Well cementation is an indispensable important link in drilling operation course, in order to Reinforcing Shaft, ensure after
Continuous drilling, packing oil, gas and water layer ensure that entire mining operations are smoothed out during exploration, need the tripping in casing into well thus,
And cement mortar is injected to the annular space between wellbore and casing, cement mortar is subsequently changed to Behavior of Hardened Cement Paste and consolidates casing and the borehole wall
Come, cement mortar not only acts as fixed and protection sleeve pipe effect in well cementing operation, and also act as protection high-pressure oil-gas layer and
The effect of severe leakage layer and other complicated bottoms is insulated, therefore the quality of cement mortar directly affects the quality of well cementation.
Part oil field is commonly encountered long cementing interval cementing quality problem not easy to control at present, is primarily due on long cementing interval
The lower temperature difference is big, and strength development is slow at the top of Behavior of Hardened Cement Paste, or even extra retarded set phenomenon occurs, and Formation bearing pressure is low, in well cementing process easily
It misses.Therefore to cement slurry property, more stringent requirements are proposed for long cementing interval well cementation, i.e., strength development is fast at the top of cement mortar, easily
Leakage generally prevents from missing using low-density cement mortar, uses plugging fiber when necessary.For long cementing interval well cementation problem, closely
Long cementing interval and the research of big temperature difference cementing technology are generally carried out within several years both at home and abroad.It is found by investigating, it is universal both at home and abroad at present
The long cementing interval of research and big temperature difference cementing technology mainly cover high density, low-density and the non-salt resistance anti-gas channeling of conventional density
Mortar architecture mainly designs high performance cement by the exploitation of the big temperature difference retarder of long cementing interval and theory of high packing
Stone has been formed simultaneously corresponding product and mortar architecture.
But the mortar architecture research for thick saline bed deep well cementing is still few, and same in the cementing technology of thick saline bed
There is above-mentioned problems for sample, and because the existing cement mortar salt-resistance used in well cementation is poor, the Salt water chlorination sodium in thick saline bed
Under the action of, the performance of cement additive can be caused to change even and failed, and additive cannot give full play to it
Effect in well cementation has seriously affected the performance of cement mortar, also affects cementing quality, and produce security risk.Cause
This, existing cement mortar is not suitable for the cementing technology of big temperature difference saline bed, can not preferably solve cement mortar in long sealing
The problem of cement slurry property difference in the presence of section saline bed.
Invention content
In view of this, an embodiment of the present invention provides a kind of cement mortar of the big temperature difference saline bed well cementation of long cementing interval, it is main
Syllabus is to provide a kind of cement mortar suitable for the big temperature difference saline bed well cementation of long cementing interval better performances used.
In order to achieve the above objectives, invention broadly provides following technical solutions：
On the one hand, the present invention provides a kind of cement mortars of the big temperature difference saline bed well cementation of long cementing interval, by weight,
Its raw material is by following material composition：
100 parts of oil-well cement,
8-15 parts of high-temperature stabilizer,
10-20 parts of palliative,
1-4 parts of fluid loss agent,
0.5-2 parts of dispersant,
0.5-2 parts of suspension stabilizer,
1-3 parts of agent for anti gassing-out,
1-3 parts of intensity adjustment agent,
0.5-2 parts of fiber,
77-100 parts of the sodium chloride solution that mass concentration is 18%,
0.5-2 parts of retarder,
0.1-0.3 parts of antifoaming agent.
Preferably, by weight, raw material is by following material composition：100 parts of oil-well cement, high-temperature stabilizer 10-
15 parts, 12-16 parts of palliative, 1.0-2.5 parts of fluid loss agent, 0.5-1.0 parts of dispersant, 0.8-1.5 parts of suspension stabilizer, gas-tight
Alter 1.5-2.5 parts of agent, 1-1.5 parts of intensity adjustment agent, 0.5-1.5 parts of fiber, the sodium chloride solution 85- that mass concentration is 18%
0.15-0.25 parts of 100 parts, 0.5-1.0 parts of retarder and antifoaming agent.
Preferably, the oil-well cement is the oil well G class g cements for meeting API specification.
Preferably, the high-temperature stabilizer is the SiO 2 powder of purity >=98%, the SiO 2 powder
Grain size is 0.1 μm -0.3 μm.
Preferably, the agent for anti gassing-out is calcium oxide；The palliative is hollow glass micropearl.
Preferably, the fluid loss agent is the copolymer of Sodium Polyacrylate and -2 methyl propane sulfonic acid of 2- acrylamidos.
Preferably, the dispersant is aliphatic hydroxyl sulphonate condensation product；The intensity adjustment agent is sulfate.
Preferably, the suspension stabilizer is bentonite and/or cellulose；The fiber is basalt fibre.
Preferably, the retarder is -2 methyl propane sulfonic acid polymer of 2- acrylamidos；The antifoaming agent is phosphoric acid
Tributyl.
On the other hand, the present invention provides a kind of preparation sides of the cement mortar of the big temperature difference saline bed well cementation of long cementing interval
Method includes the following steps：
(1) formula rate is pressed by oil well G class g cements, high-temperature stabilizer, palliative, fluid loss agent, dispersant, suspending stabilized
Agent, agent for anti gassing-out, intensity adjustment agent and fiber are mixed and stirred for uniformly, dry-mixed material being made；
(2) retarder and antifoaming agent are dissolved in the sodium chloride solution that mass concentration is 18% by formula rate, stirring
Uniformly, wet mixing material is made；
(3) the wet mixing material is stirred with the speed of 4000r/min, simultaneously, the dry-mixed material is at the uniform velocity added for stirring
In the wet mixing material, the cement mortar of the big temperature difference saline bed well cementation of long cementing interval is obtained.
Compared with prior art, the beneficial effects of the invention are as follows：
For the well cementation of long cementing interval big temperature difference saline bed there are the problem of, by adjusting the ratio of each component in cement mortar
Example and the technological means by optimizing cement-slurry method, solve the additive due to cement mortar in big this spy of temperature difference saline bed
Additive impaired performance or failure under different environment and the technical issues of cause the comprehensive performance of cement mortar to weaken, reached cement mortar
Still there is the technique effect of preferable anti-gas channeling, salt resistance and high temperature resistance in the big temperature difference saline bed well cementing process of long cementing interval.
Specific implementation mode
It is of the invention to reach the technological means and effect that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Specific implementation mode, technical solution, feature and its effect applied according to the present invention is described in detail as after in preferred embodiment.
The special characteristic, structure or feature in multiple embodiments in following the description can be combined by any suitable form；The present invention is retouching
When stating the preparation method of the big temperature difference saline bed cementing slurry of long cementing interval, used serial number (1) (2) (3) (4) does not limit
The step of the method for the present invention, is sequentially；In embodiment, for the congener with same or similar property and performance same effect
Matter is only enumerated which part substance and is illustrated, and does not make all to enumerate, other unrequited substances, which equally have, has enumerated substance
Had technique effect；When having range of choice for the content of substance, the partial data only enumerated in range of choice is said
It is bright, do not make all to enumerate, other unrequited data equally have technique effect possessed by enumerated data in range of choice.
Embodiment 1
Weigh 100 parts of oil well G class g cements, 8 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm), 10
Part hollow glass micropearl, 1 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 0.5 part of aliphatic hydroxyl sulphonate condensation product,
Above-mentioned substance is mixed and stirred for uniformly by 0.5 part of bentonite, 1 part of calcium oxide, 1 part of sulfate and 0.5 part of basalt fibre, system
Obtain dry-mixed material；
It weighs 0.5 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.1 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 77 parts of mass concentrations are 18%, and wet mixing material is made；
Above-mentioned wet mixing material is stirred with the speed of 4000r/min, stirring simultaneously, above-mentioned dry-mixed material is at the uniform velocity added above-mentioned
In wet mixing material, the cement mortar of the big temperature difference saline bed well cementation of long cementing interval is obtained.The performance of above-mentioned cement mortar is measured, knot is measured
Fruit is shown in Table 2- tables 3.
Embodiment 2
Weigh 100 parts of oil well G class g cements, 15 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
20 parts of hollow glass micropearls, 4 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 2 parts of aliphatic hydroxyl sulphonate condensation products,
Above-mentioned substance is mixed and stirred for uniformly, being made dry by 2 parts of bentonites, 3 parts of calcium oxide, 3 parts of sulfate and 2 parts of basalt fibres
Mixed material；
It weighs 2 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.3 part of tributyl phosphate, and uniform dissolution
It in the sodium chloride solution that 100 parts of mass concentrations are 18%, stirs evenly, wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 3
Weigh 100 parts of oil well G class g cements, 10 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
13 parts of hollow glass micropearls, 2 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 0.8 part of aliphatic hydroxyl sulphonate condensation
Object, 0.9 part of bentonite, 1.5 parts of calcium oxide, 1.6 parts of sulfate and 0.8 part of basalt fibre, above-mentioned substance is mixed and stirred for
Uniformly, dry-mixed material is made；
It weighs 0.8 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.15 part of tributyl phosphate, and uniformly
It is dissolved in the sodium chloride solution that 83 parts of mass concentrations are 18%, stirs evenly, wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 4
Weigh 100 parts of oil well G class g cements, 12 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
16 parts of hollow glass micropearls, 3 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 1 part of aliphatic hydroxyl sulphonate condensation product,
1.3 portions of swelling great soil group suspension stabilizers, 2 parts of calcium oxide, 2 parts of sulfate and 1.2 parts of basalt fibres mix above-mentioned substance simultaneously
It stirs evenly, dry-mixed material is made；
It weighs 1.6 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.25 part of tributyl phosphate, and uniformly
It is dissolved in the sodium chloride solution that 91 parts of mass concentrations are 18%, stirs evenly, wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 5
Weigh 100 parts of oil well G class g cements, 13 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
18 parts of hollow glass micropearls, 3.5 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 1.8 parts of aliphatic hydroxyl sulphonate contractings
Object, 1.7 parts of bentonites, 2.7 parts of calcium oxide, 2.8 parts of sulfate and 1.7 parts of basalt fibres are closed, above-mentioned substance is mixed and stirred
It mixes uniformly, dry-mixed material is made；
It weighs 1.8 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.2 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 97 parts of mass concentrations are 18%, and wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 6
Weigh 100 parts of oil well G class g cements, 12 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
14 parts of hollow glass micropearls, 1.7 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 0.5 part of aliphatic hydroxyl sulphonate contracting
Object, 1 part of bentonite, 2 parts of calcium oxide, 1 part of sulfate and 1 part of basalt fibre are closed, above-mentioned substance is mixed and stirred for uniformly, system
Obtain dry-mixed material；
It weighs 0.5 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.2 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 86 parts of mass concentrations are 18%, and wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 7
Weigh 100 parts of oil well G class g cements, 12 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
14 parts of floating beads (chemical analysis is mainly silica and alundum (Al2O3)), 1.7 parts of -2 methyl propane sulfonic acids of 2- acrylamidos are poly-
Close object, 0.5 part of aliphatic hydroxyl sulphonate condensation product, 1 part of bentonite, 2 parts of calcium oxide, 1 part of sulfate and 1 part of basalt fibre
Above-mentioned substance is mixed and stirred for uniformly, dry-mixed material being made by dimension；
It weighs 0.5 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.2 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 86 parts of mass concentrations are 18%, and wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Embodiment 8
Weigh 100 parts of oil well G class g cements, 12 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
14 parts of hollow glass micropearls, 1.7 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 0.5 part of aliphatic hydroxyl sulphonate contracting
Object, 1 part of bentonite, 2 parts of aluminium powders, 1 part of sulfate and 1 part of basalt fibre are closed, above-mentioned substance is mixed and stirred for uniformly, being made
Dry-mixed material；
It weighs 0.5 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.2 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 86 parts of mass concentrations are 18%, and wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Comparative example 1
Weigh 100 parts of oil well G class g cements, 5 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm), 5
Part hollow glass micropearl, 0.5 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 0.3 part of aliphatic hydroxyl sulphonate condensation
Object, 0.3 part of bentonite, 0.5 part of calcium oxide, 0.5 part of sulfate and 0.3 part of basalt fibre, above-mentioned substance is mixed and stirred for
Uniformly, dry-mixed material is made；
It weighs 0.3 part of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.1 part of tributyl phosphate, and uniformly molten
Solution stirs evenly in the sodium chloride solution that 70 parts of mass concentrations are 18%, and wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
Comparative example 2
Weigh 100 parts of oil well G class g cements, 20 parts of SiO 2 powders (purity >=98%, grain size are 0.1 μm -0.3 μm),
25 parts of hollow glass micropearls, 8 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos, 3 parts of aliphatic hydroxyl sulphonate condensation products,
Above-mentioned substance is mixed and stirred for uniformly, being made dry by 3 parts of bentonites, 4 parts of calcium oxide, 4 parts of sulfate and 3 parts of basalt fibres
Mixed material；
It weighs 3 parts of -2 methyl propane sulfonic acid polymer of 2- acrylamidos and 0.4 part of tributyl phosphate, and uniform dissolution
It in the sodium chloride solution that 110 parts of mass concentrations are 18%, stirs evenly, wet mixing material is made；
Wet mixing material is stated so that the speed stirring of 4000r/min is above-mentioned, simultaneously, above-mentioned dry-mixed material is at the uniform velocity added for stirring
It states in wet mixing material to get to the cement mortar of the big temperature difference saline bed well cementation of long cementing interval.The performance of above-mentioned cement mortar is measured, is tied
Fruit is shown in Table 2- tables 3.
The performance requirement of cement mortar prepared by 1 embodiment 1-8 of table
| Project | Cement mortar |
| Density, g/cm3 | 1.40-1.65 |
| Fluidity, cm | 21-23 |
| API fluid losses, ml (6.9MPa*30min) | ≤50 |
| Free liquid, % | ≤0.8 |
| BP settled densities are poor, g/cm3 | ≤0.02 |
| Initial consistency, Bc | ≤25 |
| 100Bc thickening times, min | 200-300 |
| 48 hours 60 DEG C of compression strength, MPa | ≥5.0 |
| 48 hours 36 DEG C of compression strength, MPa | ≥2.5 |
Thickening time：Water reaches the time needed for 100Bc with consistency after cement mixing.
The performance measurement of the cement mortar of the big temperature difference saline bed well cementation of long cementing interval of table 2 embodiment 1-8 and comparative example 1-2
As a result
The compression strength of the cement mortar of the big temperature difference saline bed well cementation of long cementing interval of table 3 embodiment 1-8 and comparative example 1-2
Measurement result
Proportion relation of each additive in the cement mortar of the big temperature difference saline bed well cementation of long cementing interval is comprehensive to the cement mortar
Close the influence of performance：
The additive all same of six kinds of cement mortars prepared by embodiment 1-6, but weight of each additive in cement mortar
Ratio is different.By several performances for measuring embodiment 1-6 cement mortars, it can be seen that embodiment 1-6, with each group distribution ratio
Adjustment, the performance of cement mortar change.Wherein, the cement mortar comprehensive performance of embodiment 6 is optimal, the fluidity of slurry under room temperature
Good, fluidity 22cm is live easy to operate；The slurry stability is good under high temperature, and difference of densities is zero and free water is zero；
API fluid losses are 36ml, and the thickening time is adjustable；Behavior of Hardened Cement Paste compression strength is high simultaneously and quickly grows, which is in temperature
Its compression strength is surveyed as 7.5MPa after conserving 48h under the conditions of 60 DEG C, is that compression strength is highest in 6 embodiments, in temperature 36
Its compression strength is surveyed as 5.0MPa and highest after conserving 48h under the conditions of DEG C.By above-mentioned measurement result and comparison, can see
Go out using weight proportion of each additive in cement mortar in embodiment 6, the optimal mesh of the comprehensive performance of cement mortar may be implemented
's.
By comparative example 7 and embodiment 6, embodiment 7 is identical with the weight proportion of each additive in embodiment 6, no
It is with place, compared with Example 6, palliative uses oxide-based floating bead rather than hollow glass micropearl to embodiment 7, leads to
The measurement result of observation embodiment 7 and 6 is crossed, it is found that the settled density difference of the cement mortar prepared by embodiment 7 increases, fluid loss increases
Greatly, the thickening time greatly shortens, and compression strength reduces, and illustrates that the cement mortar of oxide-based floating bead used by embodiment 7 is comprehensive
Closing performance does not have hollow glass micropearl cement mortar effect used by embodiment 6 good.
By comparative example 8 and embodiment 6, embodiment 8 is identical with the weight proportion of each additive in embodiment 6, no
It is with place, compared with Example 6, agent for anti gassing-out uses aluminium powder and gets angry type agent for anti gassing-out rather than calcium oxide embodiment 8
Agent for anti gassing-out, by observe embodiment 8 and 6 measurement result, find embodiment 8 prepared by cement mortar settled density it is poor
Raising, fluid loss increase, the thickening time shortens, and compression strength reduces, because the stability of slurry is adjusted in calcium oxide, reduce
Cement mortar high temperature fluid loss, to improve the anti-gas channeling performance of cement mortar, and aluminium powder belongs to the agent for anti gassing-out for the type of getting angry, by swollen
Swollen principle achievees the purpose that anti-gas channeling, is had no significant effect to the stability and fluid loss of slurry, illustrates aluminium used by embodiment 8
Powder does not have the effect of 6 used calcium oxide agent for anti gassing-out of embodiment good in the comprehensive performance of cement mortar.
By comparative example 1-6 and comparative example 1, each additive selected species are homogeneous in embodiment 1-6 and comparative example 1
Together, the difference is that, weight proportion of each additive in cement mortar is different, by observing embodiment 1-6 and comparative example 1
Measurement result finds that the settled density difference of the cement mortar prepared by comparative example increases, fluid loss increases, the thickening time shortens, by
It is reduced in mitigating dosage, so compression strength has certain increase, but its comprehensive performance is much worse than prepared by embodiment 1-6
Cement mortar.
It is also poor by cement mortar its comprehensive performance prepared by 2 comparative example 2 of comparative example 1-6 and comparative example.
Described above, the weight proportion of each additive plays very important effect to the performance of cement mortar in cement mortar,
Additive weight proportion in cement mortar is different, and the performance for the cement mortar prepared is also multifarious, therefore ideal to obtain
The cement mortar of the big temperature difference saline bed well cementation of long cementing interval also needs other than selecting suitable high-temperature resisting and salt-resisting additive to water
The weight proportion of each additive is adjusted optimization in mud.
Effect of each additive in the cement mortar of the big temperature difference saline bed well cementation of long cementing interval is as follows：
Retarder：For extending cement setting time and reducing cement slurry viscosity, the thickening time of cement mortar is adjusted, directly
Affect the high-temperature resisting and salt-resisting performance of cement mortar；Retarder generally uses high molecular polymer, lignin sulfonate and organic
One kind in phosphoric acid salt substance, two or more；According to practical application effect and additive development trend, above-mentioned implementation
In preferred high-temperature resisting and salt-resisting retarder of -2 methyl propane sulfonic acid polymer of 2- acrylamidos as above-mentioned cement mortar, i.e. AMPS
Polymer retarder.
Palliative：Help to prevent to make the static pressure of cementing slurry column decline for reducing mortar architecture density
The only leakage caused by the rupture of weak formation, ensure that cementing quality；Palliative can be divided into that adsorption capacity is strong and pulping
The high swelling earthen materia of rate, floating bead and the microballon class material including hollow glass micropearl Yu Lauxite microballon；Wherein, pass through
The palliative of the test result of embodiment 6 and embodiment 7, preferably hollow glass micropearl as above-mentioned cement mortar.
Dispersant：For reducing the ratio of mud of cement mortar, the rheological characteristic of cement mortar is improved, after making cement slurry sets
Aperture becomes smaller, and is evenly distributed, and to improve the later strength of Behavior of Hardened Cement Paste, directly affects the fluidity of cement mortar；Dispersant
It is typically chosen acetone and formaldehyde condensation products, naphthalene series substance matter, Sulfonates or the poly- polysaccharose substance of hydroxyl；It is imitated according to practical application
Fruit, above-described embodiment preferred aliphat hydroxy sulfonate are condensed dispersant of the substance of species as above-mentioned cement mortar.
Fluid loss agent：It is missed to bottom for controlling cement mortar water phase, increases the resistance to bottom leak-off, increase cement mortar
The viscosity of filtrate reduces cement slurry water loss amount, directly affects the high-temperature resisting and salt-resisting performance of cement mortar；Fluid loss agent is typically chosen
High molecular polymer, microparticle material or cellulose substances then use polymer-like substances as drop the well cementation of thick saline bed
Dehydration agent；The percentage of water loss of cement mortar is generally weighed by filter loss API；According to practical application effect, above-described embodiment is preferred
Fluid loss agent of the copolymer of Sodium Polyacrylate and -2 methyl propane sulfonic acid of 2- acrylamidos as above-mentioned cement mortar.
Agent for anti gassing-out：Gas channeling phenomenon refers to gas in high-pressure gas reservoir along between Behavior of Hardened Cement Paste and the borehole wall or Behavior of Hardened Cement Paste and casing
Gap enter low pressure layer or on the phenomenon that altering to ground, the fluid loss API of agent for anti gassing-out adjustable water mud；Agent for anti gassing-out one
As selection semi-hydrated gypsum, aluminium powder or oxide-based substance；Pass through the measurement result of embodiment 6 and embodiment 8, preferably calcium oxide
Agent for anti gassing-out of the substance as above-mentioned cement mortar.
Antifoaming agent：For eliminating or inhibiting the foam in cement mortar, predominantly polyethers, organic silicon or polyether-modified class
Substance；According to practical application effect, antifoaming agent of the preferred tributyl phosphate of above-described embodiment as above-mentioned cement mortar.
High-temperature stabilizer：Stability, intensity and drop percentage of water loss, the sedimentation of adjustable water mud for improving cement mortar is close
Degree；Generally select high-temperature stabilizer of the SILICA FUME as cement mortar；According to practical application effect, the preferred purity of above-described embodiment >=
The high-temperature stabilizer of 98% silica and average grain diameter in 0.1-0.3 μm of powder as above-mentioned cement mortar.
Suspension stabilizer：The settled density of thermal stability for improving cement mortar, adjustable water mud is poor；It is typically chosen
One kind in bentonite, cellulose and high molecular polymer, two or more；Preferred bentonite conduct in above-described embodiment
The suspension stabilizer of above-mentioned cement mortar.
The sodium chloride solution that mass concentration is 18%：Consolidate gypsum-salt bed using conventional cement slurries, due to Behavior of Hardened Cement Paste and stratum glue
Tie of poor quality, easily cause crossflow, gypsum-salt bed aquation and cause formation creep, generating huge reservoir stress makes casing become
Shape, or even casing collapse or bad break occurs, shorten oil/gas well service life.So needing to be added in cement mortar a certain amount of
Salt, i.e., 18% semi-saturation sodium chloride solution, improves the saline-alkaline tolerance of cement mortar.
Cement slurry density is adjusted by palliative, if palliative dosage is bigger than normal, Behavior of Hardened Cement Paste compression strength reduces, and dosage is too
Few, the cement mortar ratio of mud increases, and slurry stability is difficult to ensure；Cement slurry thickening time is adjusted by retarder, if retarder
Dosage is bigger than normal, and cement mortar stability and Behavior of Hardened Cement Paste top intensity are difficult to ensure under high temperature, if the very little cement slurry thickening time of dosage
It is too short, then it cannot meet construction requirement；Cement mortar API fluid losses are adjusted by fluid loss agent, if fluid loss agent dosage is bigger than normal,
Cement mortar mixes that slurry is difficult, and fluidity of slurry is poor, if dosage very little if be difficult to ensure fluid loss, influence construction safety；Pass through dispersion
Agent adjusts the mobility of cement mortar, and dosage is bigger than normal, and cement mortar is mixed slurry and is easy, and fluidity of slurry is good, but cement mortar sedimentation stability
Be difficult to ensure, if dosage very little if cement mortar mix that slurry is difficult, and fluidity of slurry is poor, cannot meet site operation requirement；Pass through height
Warm stabilizer and suspension stabilizer adjust cement mortar high stability, and dosage is bigger than normal will to cause cement mortar to mix slurry difficulty, slurry flowing
Property is poor, but then cement mortar sedimentation stability is difficult to ensure dosage very little；Behavior of Hardened Cement Paste resistance to compression is adjusted by intensity adjustment agent and fiber
Intensity and ductile strength, if dosage it is bigger than normal cement mortar will be caused to mix slurry is difficult, and fluidity of slurry is poor, if dosage very little if cannot carry
The compression strength and ductile strength of high Behavior of Hardened Cement Paste, cement properties cannot meet construction requirement.
The present invention in cement mortar by adding salt-resisting high-temperature-resisting retarder, salt-resisting high-temperature-resisting filtration-reducing agent and agent for anti gassing-out
Equal oil well cement additives and proportioning of each additive of adjusting and optimizing in cement mortar make entire mortar architecture have preferable
Comprehensive performance is particularly suitable for the well cementation of the big temperature difference saline bed of long cementing interval；This cement mortar is applied to big temperature difference saline bed
Its preferable comprehensive performance has been given full play to when well cementation, and still there is stronger saline-alkaline tolerance, high-temperature resistance and anti-gas channeling ability,
And extra retarded set ability is strong, high temperature filter loss is low, slurry sedimentation stability is good and Behavior of Hardened Cement Paste early stage with preventing for the cement mortar
The high advantage of compression strength, cement mortar using the present invention can effectively improve the big temperature difference saline bed deep well cementing matter of long cementing interval
Amount protects oil-gas Layer, extends the production life of well of oil/gas well, while the cement-slurry method is simple, field application operability is strong, can
It is promoted and applied in thick saline bed deep-well and Complex Blocks well.
Disclosed above is only the specific implementation mode of the present invention, but scope of protection of the present invention is not limited thereto, is appointed
What those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with above-mentioned scope of the claims
It is accurate.
Claims (9)
1. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval, which is characterized in that by weight, raw material is by following object
Matter forms：
100 parts of oil-well cement,
8-15 parts of high-temperature stabilizer,
10-20 parts of palliative,
1-4 parts of fluid loss agent,
0.5-2 parts of dispersant,
0.5-2 parts of suspension stabilizer,
1-3 parts of agent for anti gassing-out,
1-3 parts of intensity adjustment agent,
0.5-2 parts of fiber,
77-100 parts of the sodium chloride solution that mass concentration is 18%,
0.5-2 parts of retarder,
0.1-0.3 parts of antifoaming agent；
Wherein, the agent for anti gassing-out is calcium oxide；The palliative is hollow glass micropearl,
The retarder is 2- acrylamide-2-methylpro panesulfonic acid polymer.
2. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1, which is characterized in that by weight
Part meter, raw material is by following material composition：100 parts of oil-well cement, 10-15 parts of high-temperature stabilizer, 12-16 parts of palliative, drop are lost
1.0-2.5 parts of aqua, 0.5-1.0 parts of dispersant, 0.8-1.5 parts of suspension stabilizer, 1.5-2.5 parts of agent for anti gassing-out, intensity adjustment
1-1.5 parts of agent, 0.5-1.5 parts of fiber, mass concentration be 18% 85-100 parts of sodium chloride solution, 0.5-1.0 parts of retarder and
0.15-0.25 parts of antifoaming agent.
3. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
It is the oil well G class g cements for meeting API specification to state oil-well cement.
4. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
The SiO 2 powder that high-temperature stabilizer is purity >=98% is stated, the grain size of the SiO 2 powder is 0.1 μm -0.3 μm.
5. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
State the copolymer that fluid loss agent is Sodium Polyacrylate and 2- acrylamide-2-methylpro panesulfonic acids.
6. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
It is aliphatic hydroxyl sulphonate condensation product to state dispersant；The intensity adjustment agent is sulfate.
7. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
It is bentonite and/or cellulose to state suspension stabilizer；The fiber is basalt fibre.
8. the cement mortar of the big temperature difference saline bed well cementation of long cementing interval according to claim 1 or 2, which is characterized in that institute
It is tributyl phosphate to state antifoaming agent.
9. the preparation method of the cement mortar of the big temperature difference saline bed well cementation of long cementing interval described in claim 3, which is characterized in that
Include the following steps：
(1) press formula rate by oil well G class g cements, high-temperature stabilizer, palliative, fluid loss agent, dispersant, suspension stabilizer,
Agent for anti gassing-out, intensity adjustment agent and fiber are mixed and stirred for uniformly, dry-mixed material being made；
(2) retarder and antifoaming agent are dissolved in the sodium chloride solution that mass concentration is 18% by formula rate, are stirred evenly,
Wet mixing material is made；
(3) the wet mixing material is stirred with the speed of 4000r/min, described in stirring is at the uniform velocity added simultaneously, by the dry-mixed material
In wet mixing material, the cement mortar of the big temperature difference saline bed well cementation of long cementing interval is obtained.
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