CN106947446A - A kind of anti-corrosion low-density well cementing cement mortar system and preparation method thereof - Google Patents
A kind of anti-corrosion low-density well cementing cement mortar system and preparation method thereof Download PDFInfo
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- CN106947446A CN106947446A CN201710200346.XA CN201710200346A CN106947446A CN 106947446 A CN106947446 A CN 106947446A CN 201710200346 A CN201710200346 A CN 201710200346A CN 106947446 A CN106947446 A CN 106947446A
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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
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
Abstract
The invention provides a kind of anti-corrosion low-density well cementing cement mortar system and preparation method thereof, include the component of following parts by weight：65 90 parts of G class g cements, 10~35 parts of lightening material of well cementation, 10 30 parts of impermeable agent, 1.8~2.2 parts of oil-well cement filtrate reducer, 1 1.5 parts of cement corrosion inhibiter, 55 90 parts of water, the invention well cementing mortar architecture is stable, the permeability of Behavior of Hardened Cement Paste can effectively be reduced, improve Behavior of Hardened Cement Paste high salinity Lip river river erosion resistance itself, cement corrosion inhibiter is introduced simultaneously, play a part of protecting sleeve pipe by suppressing sleeve pipe with anode or the electrochemical cathode reaction of cement stone interface porous formation water, meet the anti-corrosion low-density well cementing cement mortar system of sealing oil well top Lip river river layer, its application prospect is good.
Description
Technical field
The present invention relates to oilfield exploitation technical field, and in particular to a kind of anti-corrosion with low-density well cementing cement mortar system and its
Preparation method.
Background technology
With going deep into for Changqing oilfields exploration and development, oil well set damage problem is increasingly severe caused by the layer corrosion of Lip river river,
Casing damaged well, watered-out well increase year by year, have a strong impact on oil recovery rate, constrain development efficiency.Long Dong, Wuqi County, deckle part area
The pollution of waterhead of block upper formation is serious, causes Partial Block can not carry out exploration and development, Partial Block casing corrosion is serious, causes
Waterflooded reservoir, after set is broken every adopt and well workover after production capacity recovery effects it is unobvious, recovery ratio be greatly reduced (it is aqueous it is basic 90% with
On), mainly returning high and cementing quality by improving cement reduces the corrosion of Lip river river, existing cementing slurry in terms of well cementation
System does not carry out the design in terms of anti-corrosion, it is impossible to effectively prevent corrosion of the formation fluid to sleeve pipe, and without for Luo He stratum
Water corrosion-resistant oil-well cement is reported with corrosion inhibiter pertinent literature.
The content of the invention
The purpose of the present invention is with low close the problem of overcoming existing well cementing mortar architecture Shortcomings there is provided a kind of anti-corrosion
Spend well cementing mortar architecture and preparation method thereof.
The technical scheme is that there is provided a kind of anti-corrosion low-density well cementing cement mortar system, including following parts by weight
Component：65-90 parts of G class g cements, cement the well 10~35 parts of lightening material, 10-30 parts of impermeable agent, oil-well cement filtrate reducer
1.8~2.2 parts, 1-1.5 parts of cement corrosion inhibiter, 55-90 parts of water.
65 parts of the clear G class g cements, cement the well 35 parts of lightening material, 20 parts of impermeable agent, oil-well cement filtrate reducer 1.8
Part, 1.5 parts of cement corrosion inhibiter, 80 parts of water.
The well cementation lightening material is the one or more combination of expanded perlite, micro- silicon and flyash.Expanded perlite
Density is 0.6g/cm3, mesh number 60-80 mesh.
The impermeable agent is water-soluble epoxy resin emulsion.Solid concentration is more than 50%.
The oil-well cement filtrate reducer is polyvinyl alcohol.
The molecular weight of polyethylene is 1788.
The cement corrosion inhibiter is the one or more combination in natrium nitrosum, calcium nitrite, sodium phosphate and Sodium Benzoate.
A kind of anti-corrosion preparation method of low-density well cementing cement mortar system, it is characterised in that：At least comprise the following steps：
Step 1) prepare the components of following parts by weight：65-90 parts of G class g cements, cement the well 10~35 parts of lightening material, impermeable
10-30 parts of agent, 1.8~2.2 parts of oil-well cement filtrate reducer, 1-1.5 parts of cement corrosion inhibiter, 55-90 parts of water；
Step 2) 10-30 parts of impermeable agent and 55-90 parts of mixing of water are stirred, in 4000 turns per minute of stirring speed
Under degree, 65-90 parts of G class g cements are added in 20s, cement the well 10~35 parts of lightening material, oil-well cement filtrate reducer 1.8~2.2
Part, 1-1.5 parts of cement corrosion inhibiter；
Step 3) under 12000 turns per minute of speed, stir 40s~50s, you can obtain well cementing mortar architecture.
Beneficial effects of the present invention：This anti-corrosion of the present invention is with low-density well cementing cement mortar system according to electrochemistry inhibition
Deposition theory, mainly introduces two kinds of materials of impermeable agent and cement corrosion inhibiter in the layer light-weight cement slurry system of existing Lip river river
Material, on the premise of cementing operation technique is not changed, is improved in Behavior of Hardened Cement Paste high salinity Lip river river erosion resistance itself, protection
Portion water source, ensure the old block oil well life-span, adapt to safety and environmental protection demand；Meanwhile, the invention well cementing mortar architecture is stable, can have
The permeability of effect reduction Behavior of Hardened Cement Paste.Wherein, the cement corrosion inhibiter of introducing is by suppressing sleeve pipe and cement stone interface porous formation
The anode or electrochemical cathode of water react to play a part of protecting sleeve pipe, meet the anti-corrosion of sealing oil well top Lip river river layer
Use low-density well cementing cement mortar system.The density of the well cementing mortar architecture is 1.35-1.65g/cm3, compression strength >=10MPa
(48h/45 DEG C), sedimentation stability is good, density contrast<0.01g/cm3, Behavior of Hardened Cement Paste corrosion resistance is good, and gas phase permeability is less than 0.08
×10-3um2, corrosion inhibition rate >=85%.
Embodiment
Embodiment 1：
The problem of in order to overcome existing well cementing mortar architecture Shortcomings, a kind of anti-corrosion is present embodiments provided with low close
Well cementing mortar architecture is spent, includes the component of following parts by weight：65-90 parts of G class g cements, 10~35 parts of lightening material of cementing the well is non-
10-30 parts of bleeding agent, 1.8~2.2 parts of oil-well cement filtrate reducer, 1-1.5 parts of cement corrosion inhibiter, 55-90 parts of water.
Wherein, the well cementation lightening material is the one or more combination of expanded perlite, micro- silicon and flyash, and expansion is precious
Pearl rock density is 0.6g/cm3, mesh number 60-80 mesh.
The impermeable agent is water-soluble epoxy resin emulsion, and the solid concentration of water-soluble epoxy resin emulsion is more than
50%.
The oil-well cement filtrate reducer is polyvinyl alcohol, and polyvinyl alcohol molecule amount is 1788.
The cement corrosion inhibiter is the one or more combination in natrium nitrosum, calcium nitrite, sodium phosphate and Sodium Benzoate.
This anti-corrosion preparation method of low-density well cementing cement mortar system, it is characterised in that：At least comprise the following steps：
Step 1) prepare the components of following parts by weight：65-90 parts of G class g cements, cement the well 10~35 parts of lightening material, impermeable
10-30 parts of agent, 1.8~2.2 parts of oil-well cement filtrate reducer, 1-1.5 parts of cement corrosion inhibiter, 55-90 parts of water；
Step 2) 10-30 parts of impermeable agent and 55-90 parts of mixing of water are stirred, in 4000 turns per minute of stirring speed
Under degree, 65-90 parts of G class g cements are added in 20s, cement the well 10~35 parts of lightening material, oil-well cement filtrate reducer 1.8~2.2
Part, 1-1.5 parts of cement corrosion inhibiter；
Step 3) under 12000 turns per minute of speed, stir 40s~50s, you can obtain well cementing mortar architecture.
This anti-corrosion of present invention low-density well cementing cement mortar system foundation electrochemistry inhibition deposition theory, mainly existing
Have in the layer light-weight cement slurry system of Lip river river and introduce two kinds of materials of impermeable agent and cement corrosion inhibiter, applied not changing well cementation
On the premise of work technique, Behavior of Hardened Cement Paste high salinity Lip river river erosion resistance itself is improved, top water source is protected, ensures old block
In the oil well life-span, adapt to safety and environmental protection demand；Meanwhile, the invention well cementing mortar architecture is stable, can effectively reduce oozing for Behavior of Hardened Cement Paste
Saturating rate.Wherein, the cement corrosion inhibiter of introducing is the anode or negative electrode by suppressing sleeve pipe and cement stone interface porous formation water
Electrochemical reaction plays a part of protecting sleeve pipe, meets the anti-corrosion low-density well cementing cement of sealing oil well top Lip river river layer
Slurry system.
Embodiment 2：
A kind of anti-corrosion low-density well cementing cement mortar system is present embodiments provided, by the material group of following parts by weight
Into：65 parts of G class g cements, 35 parts of expanded perlite, 20 parts of water-soluble epoxy resin emulsion, polyvinyl alcohol (molecular weight 1788) 1.8
Part, 0.75 part of natrium nitrosum, 0.75 part of sodium phosphate, 80 parts of water.
Its preparation process is as follows：
20 parts of water-soluble epoxy resin emulsion and 80 parts of mixing of water are stirred, in 4000 turns per minute of mixing speed
Under, 65 parts of G class g cements, 35 parts of expanded perlite, 1.8 parts of polyvinyl alcohol (molecular weight 1788), natrium nitrosum are added in 20s
0.75 part, 0.75 part of sodium phosphate under 12000 turns per minute of speed, stirs 40s~50s, you can obtain cementing concrete slurry
System.
The performance evaluation of the well cementing mortar architecture is as follows：
(1) density of the well cementing mortar architecture is tested with digital display liquid densimeter, density is 1.35g/cm3, choose Ф
20mm × 50cm high temperature resistant PVC hollow pipe, the well cementing mortar architecture is poured into hollow pipe, sealing two ends, is supported in high temperature
45 DEG C of maintenance 2h are carried out in protecting box, are taken out after solidification, three sections of average intercept weighs quality, surveys its volume respectively using drainage,
Behavior of Hardened Cement Paste three sections of density differences of upper, middle and lower are calculated, density contrast is 0.01g/cm3；
(2) 45 DEG C of maintenance 48h are carried out in High Temperature Curing case together with the well cementing mortar architecture with testing mould, then
Its compression strength is tested using pressure testing machine, compression strength is 10.4MPa；
(3) gas phase permeability of the well cementing mortar architecture is tested using Behavior of Hardened Cement Paste permeability analyzer, permeability is
0.07×10-3um2；
(4) by the well cementing mortar architecture with carrying out 45 DEG C of maintenances in High Temperature Curing case together with mortar architecture at present
48h, takes out Behavior of Hardened Cement Paste, is positioned over 45 DEG C of maintenance 168h in the river solution of Lip river, tests its front and rear mass loss, commented with below equation
The antiseptic property of valency cement mortar：
Wherein：η is corrosion inhibition rate, %；The corrosion inhibition rate of the well cementing mortar architecture is 90%；
Δm0For at present with the mass loss of mortar architecture Behavior of Hardened Cement Paste, g；
Δm1For the mass loss of the well cementing mortar architecture Behavior of Hardened Cement Paste, g.
Embodiment 3：
A kind of anti-corrosion low-density well cementing cement mortar system is present embodiments provided, by the material group of following parts by weight
Into：80 parts of G class g cements, 20 parts of expanded perlite, 15 parts of water-soluble epoxy resin emulsion, polyvinyl alcohol 1788 (molecular weight 1788)
2 parts, totally 1.2 parts of natrium nitrosum and sodium phosphate, and natrium nitrosum and Sodium Benzoate ratio are 1.5:1,80 parts of water.
Its preparation process is as follows：
20 parts of water-soluble epoxy resin emulsion and 80 parts of mixing of water are stirred, in 4000 turns per minute of mixing speed
Under, add 65 parts of G class g cements in 20s, 35 parts of expanded perlite, 1.8 parts of polyvinyl alcohol (molecular weight 1788), natrium nitrosum with
Totally 1.2 parts of sodium phosphate, under 12000 turns per minute of speed, stirs 40s~50s, you can obtain well cementing mortar architecture.
The performance evaluation of the well cementing mortar architecture is as follows：
(1) density of the well cementing mortar architecture is tested with digital display liquid densimeter, density is 1.48g/cm3, choose Ф
20mm × 50cm high temperature resistant PVC hollow pipe, the well cementing mortar architecture is poured into hollow pipe, sealing two ends, is supported in high temperature
45 DEG C of maintenance 2h are carried out in protecting box, are taken out after solidification, three sections of average intercept weighs quality, surveys its volume respectively using drainage,
Behavior of Hardened Cement Paste three sections of density differences of upper, middle and lower are calculated, density contrast is 0.01g/cm3；
(2) 45 DEG C of maintenance 48h are carried out in High Temperature Curing case together with the well cementing mortar architecture with testing mould, then
Its compression strength is tested using pressure testing machine, compression strength is 13MPa；
(3) gas phase permeability of the well cementing mortar architecture is tested using Behavior of Hardened Cement Paste permeability analyzer, permeability is
0.07×10-3um2；
(4) by the well cementing mortar architecture with carrying out 45 DEG C of maintenances in High Temperature Curing case together with mortar architecture at present
48h, takes out Behavior of Hardened Cement Paste, is positioned over 45 DEG C of maintenance 168h in the river solution of Lip river, tests its front and rear mass loss, commented with below equation
The antiseptic property of valency cement mortar：
Wherein：η is corrosion inhibition rate, %；The corrosion inhibition rate of the well cementing mortar architecture is 92%；
Δm0For at present with the mass loss of mortar architecture Behavior of Hardened Cement Paste, g；
Δm1For the mass loss of the well cementing mortar architecture Behavior of Hardened Cement Paste, g.
Embodiment 4：
A kind of anti-corrosion low-density well cementing cement mortar system is present embodiments provided, by the material group of following parts by weight
Into：85 parts of G class g cements, 15 parts of expanded perlite, 15 parts of water-soluble epoxy resin emulsion, polyvinyl alcohol 1788 (molecular weight 1788)
2 parts, totally 1.2 parts of natrium nitrosum and Sodium Benzoate, and natrium nitrosum and Sodium Benzoate ratio are 1.6:1,85 parts of water.
Its preparation process is as follows：
15 parts of water-soluble epoxy resin emulsion and 85 parts of mixing of water are stirred, in 4000 turns per minute of mixing speed
Under, 85 parts of G class g cements, 15 parts of expanded perlite, 2 parts of polyvinyl alcohol (molecular weight 1788), natrium nitrosum and benzene are added in 20s
Totally 1.2 parts of sodium formate, under 12000 turns per minute of speed, stirs 40s~50s, you can obtain well cementing mortar architecture.
The performance evaluation of the well cementing mortar architecture is as follows：
(1) density of the well cementing mortar architecture is tested with digital display liquid densimeter, density is 1.56g/cm3, choose Ф
20mm × 50cm high temperature resistant PVC hollow pipe, the well cementing mortar architecture is poured into hollow pipe, sealing two ends, is supported in high temperature
45 DEG C of maintenance 2h are carried out in protecting box, are taken out after solidification, three sections of average intercept weighs quality, surveys its volume respectively using drainage,
Behavior of Hardened Cement Paste three sections of density differences of upper, middle and lower are calculated, density contrast is 0g/cm3；
(2) 45 DEG C of maintenance 48h are carried out in High Temperature Curing case together with the well cementing mortar architecture with testing mould, then
Its compression strength is tested using pressure testing machine, compression strength is 15MPa；
(3) gas phase permeability of the well cementing mortar architecture is tested using Behavior of Hardened Cement Paste permeability analyzer, permeability is
0.06×10-3um2；
(4) by the well cementing mortar architecture with carrying out 45 DEG C of maintenances in High Temperature Curing case together with mortar architecture at present
48h, takes out Behavior of Hardened Cement Paste, is positioned over 45 DEG C of maintenance 168h in the river solution of Lip river, tests its front and rear mass loss, commented with below equation
The antiseptic property of valency cement mortar：
Wherein：η is corrosion inhibition rate, %；The corrosion inhibition rate of the well cementing mortar architecture is 93%；
Δm0For at present with the mass loss of mortar architecture Behavior of Hardened Cement Paste, g；
Δm1For the mass loss of the well cementing mortar architecture Behavior of Hardened Cement Paste, g.
Embodiment 5：
A kind of anti-corrosion low-density well cementing cement mortar system is present embodiments provided, by the material group of following parts by weight
Into：90 parts of G class g cements, 10 parts of expanded perlite, 10 parts of water-soluble epoxy resin emulsion, polyvinyl alcohol 1788 (molecular weight 1788)
1.8 parts, totally 1.2 parts of natrium nitrosum and Sodium Benzoate, and natrium nitrosum and Sodium Benzoate ratio are 2:1,55 parts of water.
Its preparation process is as follows：
10 parts of water-soluble epoxy resin emulsion and 55 parts of mixing of water are stirred, in 4000 turns per minute of mixing speed
Under, add 90 parts of G class g cements in 20s, 10 parts of expanded perlite, 1.8 parts of polyvinyl alcohol (molecular weight 1788), natrium nitrosum with
Totally 1.2 parts of Sodium Benzoate, under 12000 turns per minute of speed, stirs 40s~50s, you can obtain well cementing mortar architecture.
The performance evaluation of the well cementing mortar architecture is as follows：
(1) density of the well cementing mortar architecture is tested with digital display liquid densimeter, density is 1.65g/cm3, choose Ф
20mm × 50cm high temperature resistant PVC hollow pipe, the well cementing mortar architecture is poured into hollow pipe, sealing two ends, is supported in high temperature
45 DEG C of maintenance 2h are carried out in protecting box, are taken out after solidification, three sections of average intercept weighs quality, surveys its volume respectively using drainage,
Behavior of Hardened Cement Paste three sections of density differences of upper, middle and lower are calculated, density contrast is 0g/cm3；
(2) 45 DEG C of maintenance 48h are carried out in High Temperature Curing case together with the well cementing mortar architecture with testing mould, then
Its compression strength is tested using pressure testing machine, compression strength is 16MPa；
(3) gas phase permeability of the well cementing mortar architecture is tested using Behavior of Hardened Cement Paste permeability analyzer, permeability is
0.06×10-3um2；
(4) by the well cementing mortar architecture with carrying out 45 DEG C of maintenances in High Temperature Curing case together with mortar architecture at present
48h, takes out Behavior of Hardened Cement Paste, is positioned over 45 DEG C of maintenance 168h in the river solution of Lip river, tests its front and rear mass loss, commented with below equation
The antiseptic property of valency cement mortar：
Wherein：η is corrosion inhibition rate, %；The corrosion inhibition rate of the well cementing mortar architecture is 93%；
Δm0For at present with the mass loss of mortar architecture Behavior of Hardened Cement Paste, g；
Δm1For the mass loss of the well cementing mortar architecture Behavior of Hardened Cement Paste, g.
In above example 1~5, perseverance of the agitator from the CHANDLER3260 models of CHANDLER companies of the U.S.
Fast agitator, the digital densitometer for the YMS1-5 models that digital display liquid densimeter is produced using the sensible instrumentation factory in Qingdao sea,
High Temperature Curing case is from the High Temperature Curing case of the OWC-118 models of Institute for Applied Technology of Shenyang Aerospace University, pressure examination
The microcomputer Automatic Control pressure testing machine for the WHY-300/10 models that machine is Shanghai Hualong Test Instruments Corporation is tested,
Behavior of Hardened Cement Paste permeability analyzer is the Behavior of Hardened Cement Paste Permeability tester of the CTE3020 models of Shi Defu international corporation of the U.S..
In summary, this anti-corrosion that the present invention is provided is 1.35-1.65g/ with low-density well cementing cement mortar system density
cm3, compression strength >=10MPa (48h/45 DEG C), sedimentation stability is good, density contrast<0.01g/cm3, Behavior of Hardened Cement Paste corrosion resistance is good,
Gas phase permeability is less than 0.08 × 10-3um2, corrosion inhibition rate >=85%.The well cementing mortar architecture is stable, can effectively reduce Behavior of Hardened Cement Paste
Permeability, improve Behavior of Hardened Cement Paste high salinity Lip river river erosion resistance itself, while introducing cement corrosion inhibiter, pass through and suppress set
Pipe reacts to play a part of protecting sleeve pipe with the anode or electrochemical cathode of cement stone interface porous formation water, meets sealing
The anti-corrosion low-density well cementing cement mortar system of oil well top Lip river river layer, assigns the anti-height of Regular low density well cementing mortar architecture
Salinity Lip river river corrosion function, protects top water source, ensures the old block oil well life-span, adapt to safety and environmental protection demand, it is applied
Have good prospects.A kind of Lip river river anti-corrosion low-density well cementing cement mortar system that the present invention is provided and preparation method thereof.
It is exemplified as above be only to the present invention for example, do not constitute the limitation to protection scope of the present invention, it is all
It is to be belonged to the same or analogous design of the present invention within protection scope of the present invention.
Claims (8)
1. a kind of anti-corrosion low-density well cementing cement mortar system, it is characterised in that：Include the component of following parts by weight：G class g cements
65-90 parts, cement the well 10~35 parts of lightening material, 10-30 parts of impermeable agent, 1.8~2.2 parts of oil-well cement filtrate reducer, cement
1-1.5 parts of corrosion inhibiter, 55-90 parts of water.
2. anti-corrosion as claimed in claim 1 low-density well cementing cement mortar system, it is characterised in that：65 parts of the G class g cements,
35 parts of lightening material of well cementation, 20 parts of impermeable agent, 1.8 parts of oil-well cement filtrate reducer, 1.5 parts of cement corrosion inhibiter, 80 parts of water.
3. anti-corrosion as claimed in claim 1 or 2 low-density well cementing cement mortar system, it is characterised in that：The well cementation mitigates
Material is the one or more combination of expanded perlite, micro- silicon and flyash.
4. anti-corrosion as claimed in claim 1 or 2 low-density well cementing cement mortar system, it is characterised in that：The impermeable agent
For water-soluble epoxy resin emulsion.
5. anti-corrosion as claimed in claim 1 or 2 low-density well cementing cement mortar system, it is characterised in that：The oil-well cement
Fluid loss agent is polyvinyl alcohol.
6. anti-corrosion as claimed in claim 5 low-density well cementing cement mortar system, it is characterised in that：The molecular weight of polyethylene
For 1788.
7. anti-corrosion as claimed in claim 1 or 2 low-density well cementing cement mortar system, it is characterised in that：The cement inhibition
Agent is the one or more combination in natrium nitrosum, calcium nitrite, sodium phosphate and Sodium Benzoate.
8. a kind of anti-corrosion preparation method of low-density well cementing cement mortar system, it is characterised in that：At least comprise the following steps：
Step 1) prepare the components of following parts by weight：65-90 parts of G class g cements, cement the well 10~35 parts of lightening material, impermeable agent
10-30 parts, 1.8~2.2 parts of oil-well cement filtrate reducer, 1-1.5 parts of cement corrosion inhibiter, 55-90 parts of water；
Step 2) 10-30 parts of impermeable agent and 55-90 parts of mixing of water are stirred, in 4000 turns per minute of mixing speed
Under, 65-90 parts of G class g cements are added in 20s, 10~35 parts of lightening material of cementing the well, 1.8~2.2 parts of oil-well cement filtrate reducer,
1-1.5 parts of cement corrosion inhibiter；
Step 3) under 12000 turns per minute of speed, stir 40s~50s, you can obtain well cementing mortar architecture.
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| CN108102621A (en) * | 2017-11-20 | 2018-06-01 | 中石化石油工程技术服务有限公司 | A kind of oil-well cement high pressure-bearing low-density palliative and its preparation, application process |
| CN109517589A (en) * | 2017-09-19 | 2019-03-26 | 中国石油化工股份有限公司 | A kind of oil gas well cementing operation dry method light-weight cement slurry and preparation method |
| CN112832714A (en) * | 2021-03-01 | 2021-05-25 | 陕西延长石油（集团）有限责任公司 | Method for preventing secondary damage of oil-gas well casing |
| CN115678524A (en) * | 2022-10-11 | 2023-02-03 | 中国石油天然气集团有限公司 | Casing anticorrosion complexing agent and capsule for oil and gas well cementation and preparation method and application thereof |
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| CN115678524A (en) * | 2022-10-11 | 2023-02-03 | 中国石油天然气集团有限公司 | Casing anticorrosion complexing agent and capsule for oil and gas well cementation and preparation method and application thereof |
| CN115678524B (en) * | 2022-10-11 | 2023-10-10 | 中国石油天然气集团有限公司 | Casing anti-corrosion complexing agent and capsule for well cementation of oil and gas well, and preparation method and application thereof |
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