CN103045215B - Aluminate cement-based carbon dioxide corrosion resistant cement system for cementing of well - Google Patents
Aluminate cement-based carbon dioxide corrosion resistant cement system for cementing of well Download PDFInfo
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- CN103045215B CN103045215B CN201310030129.2A CN201310030129A CN103045215B CN 103045215 B CN103045215 B CN 103045215B CN 201310030129 A CN201310030129 A CN 201310030129A CN 103045215 B CN103045215 B CN 103045215B
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Abstract
The invention relates to an aluminate cement-based carbon dioxide corrosion resistant cement system for cementing of a well. The aluminate cement-based carbon dioxide corrosion resistant cement system comprises the following components in parts by weight: 100 parts of aluminate cement, 40 parts of water, 8-12 parts of sodium phosphate, 0.4-0.6 part of oil well cement defoamer and 0-3.5 parts of retarder. The aluminate cement-based carbon dioxide corrosion resistant cement system disclosed by the invention has excellent CO2 corrosion resistance under the conditions of high temperature, high pressure and high-concentration CO2, and has good strength performance under high temperature. The compressive strength of the set cement 3d can reach 39.8 MPa, and the set cement can be used for an oil-gas well which is used for sealing high-concentration CO2 corrosion for a long time, thereby not only plugging a leakage zone to a certain extent, but also reducing the occurrence of gas channeling.
Description
Technical field
The present invention relates to the resistance to CO that a kind of oil gas well drilling field is used
2corrosion cementing cement system is that one is specially adapted to height containing CO
2hydrocarbon-bearing pool exploitation, CO
2the displacement of reservoir oil, Depleted Reservoirs CO
2to bury etc. in technology application containing high concentration CO
2the aluminate cement base cement system of oil gas well cementing operation.
Background technology
At present, the cement that oil gas well cementing operation uses mostly is silicate cement system.In recent years, the CO of well cementation silicate cement mudstone
2etching problem receives much attention.This is because stratum middle and high concentration CO
2the associated gas of source no longer just oil and natural gas, also comprise CO
2the displacement of reservoir oil and CO
2the CO that the technology such as to bury is injected in a large number
2, which greatly enhances CO in stratum
2concentration.Under down-hole high temperature, high pressure and wet environment, the CO of high density
2heavy corrosion will be produced to silicate cement mudstone at short notice, show as the rate of permeation increase, intensity reduction etc. of Behavior of Hardened Cement Paste, make Behavior of Hardened Cement Paste lose sealing performance, cause the packing performance failure of sealing system, and then cause rate of oil and gas recovery reduction, CO
2bury the serious consequence such as unsuccessfully.So silicate cement mudstone can not meet containing high concentration CO
2the requirement of the long-term sealing of the Oil/gas Well in stratum, needs to study novel resistance to CO
2corrosion cementing cement system replaces silicate cement system, to improve the resistance to CO of well-cementing cement
2corrosive nature, ensures high containing CO
2hydrocarbon-bearing pool exploitation, CO
2the displacement of reservoir oil and CO
2the successful Application of technology such as to bury.
In the past few decades, along with height is containing CO
2hydrocarbon-bearing pool exploitation, CO
2displacement technology and Depleted Reservoirs CO
2the investigation and application of technology such as to bury, in succession carried out resistance to CO both at home and abroad
2the research of corrosion cementing cement system, achieves some achievements.
Article " effect analysis of slag micropowder in cement " relates to a kind of resistance to CO of low density mixing a certain amount of micro-silicon and make with drift pearl in silicate cement
2corrosion silicate cement system, effect of field application is good.The Corrosion Resistant Mechanism of system has 2 explanations: the pozzolanic action of micro-silicon changes the phase composition of Behavior of Hardened Cement Paste, can with the CH(Ca (OH) in hydrated product
2) react generation hydrated calcium silicate gel, greatly reduces the CH composition in Behavior of Hardened Cement Paste, enhances the anti-CO of Behavior of Hardened Cement Paste
2corrosive attack ability; Reacting remaining micro-silicon with CH can be filled in the space and Behavior of Hardened Cement Paste microfracture mixing solid phase accumulation body, improve the microtexture of Behavior of Hardened Cement Paste, optimize the pore size distribution of Behavior of Hardened Cement Paste, greatly reduce comparatively macrovoid, fine porosity is increased, and pore connectivity is deteriorated, and reduces Behavior of Hardened Cement Paste rate of permeation, be unfavorable for the intrusion of stratum corrosive fluid to Behavior of Hardened Cement Paste, improve the corrosion resistance nature of Behavior of Hardened Cement Paste.
The resistance to CO of Portland cement base
2corrosion cementing cement system improves the resistance to CO of Behavior of Hardened Cement Paste to a certain extent
2corrosive nature, but owing to determining the resistance to CO of Behavior of Hardened Cement Paste
2hydrated product-the hydrated calcium silicate gel (CSH) of corrosive nature still can continue and CO with certain speed
2corrosion reaction occurs, and still there is great risk in prolonged application, so the resistance to CO of Portland cement base
2corrosion cementing cement system can not meet high containing CO
2the requirement of the long-term sealing of Oil/gas Well.
Article " Advanced Cement Systems Used to Improve Geothermal Well Reliability in Java " relate to a kind of silicate cement and high-alumina cement composite and pass into the obtained low weight cement slurry of a certain amount of nitrogen, resistance to CO
2corrosive nature is good, but heat resistance and antifouling property are all poor.
Patent " oil gas well cementing operation carbon dioxide corrosion resistant cement system " (publication number CN102559161A) relates to the resistance to CO of a kind of phosphor aluminate cement base
2corrosion cement system, this system has good resistance to CO
2corrosive nature, but the mineral facies of phosphoaluminate clinker are calcium aluminate sosoloid, calcium phosphate sosoloid mainly, the product mainly phosphorite crystal mineral that aquation generates, Behavior of Hardened Cement Paste ultimate compression strength is maximum only can reach 21MPa, for a long time for having potential safety hazard under the Oil/gas Well environment of high temperature, high pressure.
The aluminate cement that the present invention uses is different from the phosphor aluminate cement mineral facies component that patent " oil gas well cementing operation carbon dioxide corrosion resistant cement system " uses, and hydrated product is also not identical, is special cement of different nature.Can there is crystal transition in aluminate cement at high temperature (> 50 DEG C), strength retraction is serious, as in casing and cementing, need improve its high-temperature behavior.
The resistance to CO of aluminate cement base carbon dioxide corrosion resistant cement system of the present invention
2corrode excellent, the Behavior of Hardened Cement Paste ultimate compression strength of at high temperature maintenance can reach 39.8MPa, solves the strength retraction problem of alone aluminate cement, and mechanical property is much better than the resistance to CO of phosphor aluminate cement base
2corrosion cement system.
Summary of the invention
The object of the invention is the deficiency solving existing aluminate cement high-temperature behavior, provide a kind of well cementation aluminate cement base carbon dioxide corrosion resistant cement system, the Behavior of Hardened Cement Paste of this cement system is at high temperature, high pressure and high concentration CO
2there is under condition excellent corrosion resistance nature, can meet high containing CO
2the requirement of the long-term sealing of Oil/gas Well, for exploratory development, High-efficient Production and environment protection provide safeguard.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of well cementation aluminate cement base carbon dioxide corrosion resistant cement system, its weight part ratio consists of: aluminate cement 100 parts, 40 parts, water, sodium phosphate salt 8 ~ 12 parts, oil well cement defoamer 0.4 ~ 0.6 part, retardant 0 ~ 3.5 part.
Described well cementation aluminate cement base carbon dioxide corrosion resistant cement system, its weight part ratio composition is preferably: aluminate cement 100 parts, 40 parts, water, sodium phosphate salt 10 parts, oil well cement defoamer 0.5 part, retardant 3 parts.
Above-mentioned aluminate cement mineral facies are monocalcium aluminate (CA) mainly, calcium dialuminate (CA
2), gehlenite (C
2aS), tricalcium aluminate (C
3and the ferro-aluminate of trace, sulfide etc. A).Aluminate cement preferred weight part ratio consists of: monocalcium aluminate 50 ~ 60 parts, calcium dialuminate 10 ~ 15 parts, gehlenite 8 ~ 15 parts, and tricalcium aluminate 3 ~ 5 parts.
Described sodium phosphate salt is phosphoric acid salt or its mixture of any processable, one or more in preferably phosphoric acid sodium, Sodium hexametaphosphate 99, trisodium phosphate, tripoly phosphate sodium STPP, SODIUM PHOSPHATE, MONOBASIC.
Described oil well cement defoamer is organic polyethers defoamer, and as the SWX-1 type defoamer that Tianjin Zhongyou Boxing Engineering Technology Co., Ltd. produces, described retardant is one or more in water glass, sodium tetraborate, sodium lignosulfonate.
In aluminate cement, add a certain amount of soluble phosphate, solve the strength retraction problem under aluminate cement high temperature on the one hand, reduce being subject to CO on the other hand
2corrode the generation of mineral and promote resistance to CO
2the generation of corrosion mineral, optimizes the mineral composition of Behavior of Hardened Cement Paste, adds the bubble amt of the defoamer hierarchy of control and improve slurry dispersiveness, adds the thickening time that retardant extends cement system where necessary.Retardant not only has delayed coagulation, can also improve the rheological of cement system, enhances the pumpability of grout.
Well cementation aluminate cement base carbon dioxide corrosion resistant cement system of the present invention has the excellent properties of following three aspects:
(1) the resistance to CO of aluminate cement base of the present invention
2corrosion cement system is at high temperature, high pressure and high concentration CO
2there is under condition excellent resistance to CO
2corrosive nature, can slow down stratum high concentration CO for oil gas well cementing operation
2to the corrosion of cement mantle, extend Oil/gas Well work-ing life.
(2) the resistance to CO of aluminate cement base of the present invention
2corrode cement system optimization aluminate cement strength property at high temperature, Behavior of Hardened Cement Paste 3d ultimate compression strength can reach 39.8MPa, can be used for long-term sealing high concentration CO
2the Oil/gas Well corroded.
(3) the resistance to CO of aluminate cement base of the present invention
2corrosion cement system has certain thixotropic property, can either carry out certain shutoff, can reduce again the generation of has channeling to weak zone.This success being conducive to cementing operation operation is carried out and improves cementing quality.
Embodiment
Further illustrate below in conjunction with embodiment.
Embodiment 1
A kind of well cementation aluminate cement base carbon dioxide corrosion resistant cement system: aluminate cement 100 parts, 40 parts, water, Sodium hexametaphosphate 99 10 parts, oil well cement defoamer 0.5 part, without retardant.Cement system sample number is 1#.Wherein, aluminate cement sends out the production of special cement melt company limited by Zhengzhou the second month in a season, and model is CA-50, and do not test the impact of Sodium hexametaphosphate 99 on aluminate cement, this system does not add retardant.
Embodiment 2
A kind of well cementation aluminate cement base carbon dioxide corrosion resistant cement system: aluminate cement 100 parts, 40 parts, water, Sodium hexametaphosphate 99 10 parts, oil well cement defoamer 0.5 part, water glass 3 parts.Cement system sample number is Z1#.The same embodiment 1 of this system contrasts, in order to test the impact of retardant on 1# system ultimate compression strength.
Comparative example 1
Cement system is filled a prescription: aluminate cement 100 parts, 40 parts, water, oil well cement defoamer 0.5 part.Cement system sample number is 2#.The same embodiment 1 of this system contrasts, in order to test the impact of Sodium hexametaphosphate 99 on aluminate cement ultimate compression strength.
Comparative example 2
Cement system is filled a prescription: good magnificent G class g cement 100 parts, 44 parts, water, Sodium hexametaphosphate 99 10 parts, oil well cement defoamer 0.5 part.Cement system sample number is 3#.This system combines with embodiment 1, compared for the carbon dioxide corrosion resistant performance of two kinds of cement systems.
Performance test:
1. high temperature compression strength evaluation
By oil-well cement test method standard GB/T19139-2003 standard system for grout, wherein water is respectively with phosphor aluminate cement total weight proportioning by mass percentage; Then pouring the grout prepared into length, width and height is in the mould of 5cm, is placed in maintenance under 75 DEG C of water baths, condition of normal pressure, takes out the demoulding, measure often kind of cement-slurry method wherein 1 piece of Behavior of Hardened Cement Paste ultimate compression strength respectively after certain length of time.Test result is in table 1.Experimental result shows, the resistance to CO of aluminate cement base of the present invention
2corrosion cement system at high temperature has higher ultimate compression strength, and the aluminate cement with contrast sample 2# is compared, and the middle and later periods ultimate compression strength of 1# cement system formula does not occur retraction.The resistance to CO of aluminate cement base of the present invention
2the high temperature compression strength evaluation of corrosion cement system
The ultimate compression strength of table 11# cement system and 2# cement system contrasts
2. corrosion resistance nature evaluation
By oil-well cement test method standard GB/T19139-2003 standard system for grout, wherein water is respectively with phosphor aluminate cement, silicate cement total weight proportioning by mass percentage; Then the grout prepared being poured into diameter is in 2.6cm, the high mould for 5cm, be placed in maintenance under 75 DEG C of water baths, condition of normal pressure, take out the demoulding after 12h, then Behavior of Hardened Cement Paste (post) is put into the maintenance of equipment of High Temperature High Pressure acid-alkali-corrosive-resisting and carry out maintenance, curing condition is 130 DEG C, CO
2dividing potential drop is about 5MPa; After maintenance 3d, 7d, 21d and 40d, take out test block and measure ultimate compression strength and depth of corrosion, test result is in table 2.Experimental result shows, the resistance to CO of well cementation aluminate cement base of the present invention
2corrosion cement system is compared with silicate cement, and the Behavior of Hardened Cement Paste ultimate compression strength that the former corrodes front and back remains unchanged substantially, and depth of corrosion is little, illustrates that the corrosion that this Behavior of Hardened Cement Paste is subject to is less; The Behavior of Hardened Cement Paste ultimate compression strength that the latter corrodes front and back significantly reduces, and depth of corrosion obviously increases, and illustrates that the corrosion that this Behavior of Hardened Cement Paste is subject to is larger.Contrast can be found out, the resistance to CO of well cementation aluminate cement base of the present invention
2corrosion cement system has good corrosion resistance nature.
The resistance to CO of table 21# cement system and 3# cement system
2corrosive nature contrasts
3. comprehensive performance evaluation
By oil-well cement test method standard GB/T19139-2003 standard system for grout, the thickening time of modified aluminophosphate grout under assigned temperature adding sample is measured by People's Republic of China (PRC) oil and gas industry standard SY/T5546-92 " oil well cement application performance test method ", test condition is normal pressure, and test result is in table 3.
By oil-well cement test method standard GB/T19139-2003 standard system for grout, the grout prepared being poured into diameter is in 2.6cm, the high mould for 5cm, be placed in maintenance under 75 DEG C of water baths, condition of normal pressure, the demoulding is taken out after 12h, then Behavior of Hardened Cement Paste (post) is put into the maintenance of equipment of High Temperature High Pressure acid-alkali-corrosive-resisting and carry out maintenance, curing condition is 130 DEG C, CO
2dividing potential drop is about 5MPa; After maintenance 7d, 21d and 40d, take out test block and measure ultimate compression strength and depth of corrosion, test result is in table 3.
The resistance to CO of table 3 aluminate cement of the present invention base
2the over-all properties table of corrosion cement system
Claims (1)
1. a well cementation aluminate cement base carbon dioxide corrosion resistant cement system, its weight part ratio consists of: aluminate cement 100 parts, 40 parts, water, Sodium hexametaphosphate 99 10 parts, oil well cement defoamer 0.5 part, water glass 3 parts, described aluminate cement weight part ratio consists of: monocalcium aluminate 50 ~ 60 parts, calcium dialuminate 10 ~ 15 parts, gehlenite 8 ~ 15 parts, and tricalcium aluminate 3 ~ 5 parts.
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| CN105199691A (en) * | 2014-06-23 | 2015-12-30 | 天津中油渤星工程科技有限公司 | Well cementation cement paste used for aquo-complex-containing stratum |
| CN105623638A (en) * | 2014-10-31 | 2016-06-01 | 中国石油天然气股份有限公司 | Resin coated hollow glass beads and preparation method therefor |
| CN106747130B (en) * | 2016-11-09 | 2019-08-02 | 嘉华特种水泥股份有限公司 | A kind of high temperature resistant oil well sealing agent |
| CN106947446A (en) * | 2017-03-30 | 2017-07-14 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of anti-corrosion low-density well cementing cement mortar system and preparation method thereof |
| CN116535169A (en) * | 2023-05-24 | 2023-08-04 | 中建西部建设北方有限公司 | Carbon-absorbing carbon-fixing concrete and preparation method thereof |
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| US7381263B2 (en) * | 2005-10-24 | 2008-06-03 | Halliburton Energy Services, Inc. | Cement compositions comprising high alumina cement and cement kiln dust |
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