CN103510910B - A kind of high temperature high voltage resistant foam slurry intensity curing system and method thereof - Google Patents
A kind of high temperature high voltage resistant foam slurry intensity curing system and method thereof Download PDFInfo
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Abstract
The invention belongs to low-density well cementing field, oil field, particularly relate to the foam slurry intensity curing system of a kind of artificial ground, described system includes foam slurry high temperature high voltage resistant intensity maintenance slurry cup, foam slurry mixture slurry cup and pipeline with pressure；Described mixture slurry cup carries out foam slurry foaming and slurry under described pipeline with pressure；After premixing afterwards in foam slurry input with pressure described maintenance slurry cup, foam slurry is carried out intensity maintenance；Described maintenance slurry cup is set to band laminated structure, is used for simulating down-hole high temperature and high pressure environment；Described band laminated structure arranges piston structure in using slurry cup.The problem solving the rule of laboratory evaluation simulation down-hole complex condition foam water mudstone strength development trend, for preferred physical blowing agent with carry out now foam slurry well cementation effect and have directive function.
Description
Technical field
The invention belongs to low-density well cementing field, oil field, particularly relate to the foamed cement of a kind of artificial ground
Slurry intensity maintenance of equipment.
Background technology
Foamed cement refers to be mixed into a certain amount of foam in conventional cement slurries, forms solid, liquid, gas three-phase
And there is the heterogeneous system of high dispersion.Foamed cement well cementation mainly reduces cement slurry density, thus drops
The head of liquid of low annular space cement mortar section, to solve the well cementation leakage problem of low pressure and easy leaking oil reservoir, and plays guarantor
Protect the effect of oil reservoir.Although foam slurry was used for building trade with regard to oneself before more than 50 years, but oil well steeps
Foam cement mortar was still proposed by Aldrich and Mitchell of the U.S. first in 1975,1984, Smith
Et al. Canada east coast deep water area, use foamed cement cement the well, be successfully realized long sealing,
The disposable well cementing operation on leakage stratum.At home, the research to using foamed cement to carry out cementing operation is begun
In 1985, the most in succession it is able to research and development in each oil field, in addition along with foaming and steady bubble technology
Development, and the raising of cementing equipment performance so that foamed low density cementing technique is developed rapidly.
Foam slurry specifically includes that the mixing of physical blowing machinery and chemical reaction foam now.Physical mechanical foams
Be divided into again foam is sent out in advance then with mix before cement slurrypump and after cementing truck pump nitrogen charging foaming both side
Formula, chemical blowing is to be mixed in ash sample and water with slurry, foaming agent and foam stabiliser in cementing operation respectively
Bubble is produced because of chemical reaction both during.Compared with generating nitrogen with chemical reaction, mechanical nitrogen charging foam
The intensity of cement is substantially higher.Because containing strong oxidizer in the cement mortar of chemical blowing, whole to Behavior of Hardened Cement Paste
Body performance can produce destruction.And owing to chemical agent nitrite and the ammonia of chemical blowing have corrosivity and poison
Property, nitrite and oxidant are complicated with cement additive interactively each other, so not pushing away
Set up in a wide range.
Along with the development of foam cementing technology, although domestic foam cementing technology is launched the most at the scene, but indoor
Research to foam slurry is also only limitted to grind the performance impact rule of foam slurry theoretically
Study carefully, to the laboratory research of the physical blowing of foam slurry it is crucial that the High Temperature High Pressure of simulation down-hole
Condition, during foam cementing cementing practice, all there is certain pressure in the flowing of foam slurry, and
And the impact that the volume of foam slurry and variable density are all stressed, therefore to measure on-the-spot foam really
The performance of cement mortar, need to airtight with pressure under the conditions of carry out.The machinery note nitrogen mode of the most indoor employing produces
The mode of foam mostly is mechanical agitation foaming, and it is to be poured into by expanding foam solution in stirring slurry cup, then uses blender
Blade shear expanding foam solution, by agitation liquid in the gas (referring generally to nitrogen), gas is stirred into liquid
In and produce foam, by cement mortar and the relevant apparatus of foams mix, use foam in the case of with pressure
Producing, with cement mortar mix homogeneously in airtight container, and injection this patent is mentioned under the effect of the pressure
High Temperature High Pressure maintenance slurry cup, put into and the high temperature and pressure protective cauldron of hardened oilwell cement intensity evaluation carry out maintenance
Mode, foam slurry is maintenance molding within certain age, then the demoulding, measure foam water mudstone strong
Degree and permeability variation rule, the application promoting foam slurry for scene has guiding effect.
Summary of the invention
The present invention is to solve technical problem present in prior art, it is proposed that a kind of high temperature high voltage resistant foam
Strength of cement grout curing system and method thereof, this device can solve laboratory evaluation simulation down-hole complex condition
The problem of the rule of foam water mudstone strength development trend, for preferred physical blowing agent with carry out now foam
Cement slurry cementing effect has directive function.
The technical scheme is that
A kind of high temperature high voltage resistant foam slurry intensity curing system, described system includes the resistance to height of foam slurry
Temperature high voltage intensity maintenance slurry cup, foam slurry mixture slurry cup and pipeline with pressure；Described mixture slurry cup is in institute
State and under pipeline with pressure, carry out foam slurry foaming and slurry；Foam slurry input with pressure after premixing afterwards
In maintenance slurry cup, Behavior of Hardened Cement Paste is carried out intensity maintenance；
Described maintenance slurry cup is set to band laminated structure, is used for simulating down-hole high temperature and high pressure environment；Described knot with pressure
Structure arranges piston structure in using slurry cup.
Described pipeline with pressure includes elevated pressure nitrogen gas tank, high pressure line and control valve；Described mixture slurry cup is described
Carry out under the pressure environment of pipeline with pressure foaming and slurry.
In concrete invention, described maintenance slurry cup includes slurry cup 1, base 2, threeway valve rod 8, piston
3, piston seat 10 and standby pressure screw rod 12；Described threeway valve rod 8 is arranged in base 2, and at described valve rod 8
On be provided with horizontal inlet and base sealing screw 13；Described piston 3 is arranged in described slurry cup 1 inner chamber；
Described standby pressure screw rod 12 one end is connected with piston 3 contact by I shape piston seat 10, and the other end passes through
Spiral shell button passes connecting rod 4, and handle is arranged on outside described slurry cup 1, is used for controlling pressure.
For mating band laminated structure, described maintenance slurry cup also includes one group of fixture and one group of sealing member；Described
Fixture includes base 2, base sealing screw 13, piston blot 9, piston baffle ring 11, connecting rod 4 and company
Bar screw 5；Described sealing member includes base sealing screw 13, O RunddichtringO 15, and the O type of base 2 is close
The O RunddichtringO 7 of seal 6 and piston 3；
Described slurry cup 1 is tightly connected with base 2 screw thread, and is sealed by the O RunddichtringO 6 of base 2；
Described threeway valve rod 8 is arranged in described base 2, and described threeway valve rod 8 is arranged in described base 2,
And the opening and closing of described threeway valve rod 8, described O RunddichtringO 15 is controlled by described base sealing screw 13
Seal described threeway valve rod 8；Described piston blot 9 is tightly connected with described piston 3 spiral shell button, and described piston
By O RunddichtringO 7 and described slurry cup 1 inner wall sealing of piston 3；Described piston baffle ring 11 is arranged on slurry
The top of cup 1, and be fixed in slurry cup 1 by screw thread, described connecting rod 4 passes through connecting rod screw 5 with described
Slurry cup 1 wall is affixed.
Described system also includes that a high temperature and high pressure kettle, described maintenance slurry cup are put into described high temperature and high pressure kettle and entered
Row intensity maintenance.
In concrete application, described pressure limit controls at 0.3-0.5MPa.
Described piston 3 diameter 30-60mm；The height 150-250mm of slurry cup 1；Thickness 12-20mm,
And described slurry cup proof pressure is 25-35MPa.
Another inventive point of the present invention is the method utilizing foam slurry intensity curing system to carry out maintenance, institute
The method of stating includes:
Slurry step, described slurry step includes cement based slurry and foam mixture；It is close that described cement based is starched
Degree encloses for 1.88-1.91g/cm3；Foam is the requirement according to foaming agent foam multiple, by the foaming of foaming agent
Liquid high speed shear produces；Described mixed ratio is 0.3-0.5%；
Slurry input maintenance slurry cup step, described step include pre-mixed serosity by band pressure pipeline by foam
Cement mortar enters in maintenance slurry cup by the horizontal access of described threeway valve rod 8, during input, and foam slurry
Understand in entering, by threeway valve rod 8, the slurry cup sealed and promote piston 3 to move up, in order to control piston 3
The retrogressing speed of rate travel Non-follow control standby pressure screw rod 12, described retrogressing speed is mixed according to foam and cement mortar
Join the difference of pressure, control at 1-3mm/s, it is ensured that foam slurry is uniformly injected in slurry cup, when piston 3
When the position of described piston baffle 11 is arrived on top, disconnect quickly connecing outside described threeway valve rod 8 threeway horizontal access
Threeway valve rod 8 bottom end seal nut screwing clamping is also closed three-way valve by head；Turn on nut 5 and will for pressure screw rod
12 and connecting rod 4 take off.
High Temperature High Pressure curing step, puts into High Temperature High Pressure by the maintenance slurry cup taking off standby pressure screw rod 12 and connecting rod 4
Still, carries out High Temperature High Pressure maintenance；Temperature 50-90 DEG C of maintenance, pressure limit is: 10-20MPa.
Described method also includes detecting step, and foam slurry injects maintenance slurry cup in the case of with pressure to be passed through
Behavior of Hardened Cement Paste is formed, it is therefore desirable to the intensity of mensuration and the Behavior of Hardened Cement Paste of permeability are one after High Temperature High Pressure maintenance molding
Directly it is placed in this slurry cup, Behavior of Hardened Cement Paste to be measured is taken out from maintenance slurry cup, measures its intensity and permeability
Concrete cement is G level oil-well cement, and water is general tap water, cement mortar after preparation
Between n=0.3-0.5, K=0.9-1.5.N value is flow index, and K is consistency coefficient, and both of which is reflection water
The parameter of mud rheology, n value is the least, and it is more weak that K value gets over large cement fluidity of slurry, reduces foam surface
Tension force is conducive to foam uniformly to mix in cement mortar, thus reaches the effect surely steeped.Foaming agent is protein
Class I liquid I foaming agent, sending out bubble multiple under normal pressure is 18-25, and the height change half-life after formation of foam is 1800s
Left and right；Standby pressure screw rod is bearing steel, and pitch is 4.8-6.0mm；
The high temperature high voltage resistant foam slurry curing means of the present invention is by cylinder, bottom, piston with sealing ring
Upper cover and rapid conversion joint composition added with standby pressure.
The feature of the present invention is as follows:
(1) cup cylinder all uses stainless steel material corrosion-resistant, anti abrasive, with energy high temperature high voltage resistant；
(2) upper and lower bowl cover feature: many screw threads, is resistant to the pressure of 25-35MPa, and upper bowl cover is hollow to withstand piston
Baffle ring, lower bowl cover has a stainless steel cover grabbing base with three；
(3) piston material is selected added with the stainless steel material of upper-lower seal circle, piston diameter 30-60mm, slurry cup
Bottom and moving piston all use O to seal, and piston have employed dual sealing manner especially to ensure to live
Filling in the sealing row during motion, slurry cup can be effectively ensured can be high pressure resistant, and what sealing ring used equally
It it is the modified rubber of high temperature resistance.
(4) pressure preparation system is by piston seat, standby pressure screw rod, and connecting rod forms, and applies to the cement mortar in slurry cup stable
Standby pressure, by walking bar rod, exit screw mandrel, the standby pressure of slow release, screw mandrel rate travel 1-3mm/s, make
Foam slurry can slowly be uniformly injected in sampler；
(5) straight cup cylinder height 150-250mm；Thickness 12-20mm, the design height of piston to top is exactly
The height that thermocouple can contact, when carrying out High Temperature High Pressure maintenance, can guarantee that temperature and slurry that thermocouple records
In cup, the temperature of foam slurry maintenance is consistent；
(6) with the use of compression system consisted of bubble by high-pressure nitrogen bottle, high pressure line, vent valve and stop valve
Foam cement mortar provides environment with pressure.
Complete by the foam water mudstone volume after foam slurry High Temperature High Pressure maintenance slurry cup maintenance, do not go out
The phenomenon of existing volume contraction, is the Behavior of Hardened Cement Paste of 1.5g/cm3 for density, and measuring its 48h comprcssive strength is
12.4MPa, corresponding permeability is 0.058md, relative to the foam water mudstone of ordinary pressure curing, High Temperature High Pressure
The comprcssive strength of the Behavior of Hardened Cement Paste after maintenance is relatively big, and permeability is relatively low, can truly reflect the Behavior of Hardened Cement Paste property in down-hole
Energy.
Accompanying drawing explanation
Fig. 1 is the external structure schematic diagram of foam slurry high temperature high voltage resistant intensity maintenance slurry cup；
Fig. 2 is the external elevational structural representation of foam slurry high temperature high voltage resistant intensity maintenance slurry cup；
Fig. 3 is the internal structure schematic diagram of foam slurry high temperature high voltage resistant intensity maintenance slurry cup.
To be illustrated in conjunction with summary of the invention and detailed description of the invention
In figure, 1-slurry cup；2-base；3-piston；4-connecting rod；5-screw；6-O type circle；7-O type circle；8-tri-
Logical valve rod；9-screw；10-piston seat；11-piston baffle ring；12-standby pressure screw rod；13-base sealing screw；
14-base holding nut；15-O type circle.
Detailed description of the invention
Described maintenance slurry cup includes slurry cup 1, threeway valve rod 8, piston 3, piston seat 10 and standby pressure screw rod
12；Described threeway valve rod 8 is arranged in described slurry cup base 2, and is provided with on described threeway valve rod 8
Horizontal inlet and bottom end seal mouth；Described piston 3 is arranged in described slurry cup 1 inner chamber；Described standby pressure spiral shell
Piston 3 and standby pressure screw rod 12 contact are connected by bar 12 one end by I shape piston seat 10, and the other end leads to
Crossing spiral shell button and pass connecting rod 4, handle is arranged on outside described slurry cup 1, is used for controlling pressure.
For mating band laminated structure, described maintenance slurry cup also includes one group of fixture and one group of sealing member；Described
Fixture includes base 2, base sealing screw 13, piston blot 9, piston baffle ring 11, connecting rod 4 and company
Bar screw 5；Described sealing member includes the O RunddichtringO 15 of base sealing screw 13, and the O type of base 2 is close
The O RunddichtringO 7 of seal 6 and piston 3；
Described slurry cup 1 is tightly connected with base 2 screw thread, and is sealed by the O RunddichtringO 6 of base 2；
Described threeway valve rod 8 is arranged in described base 2, and close by the O RunddichtringO 15 of threeway valve rod 8
Envelope；Piston blot 9 and piston 3 are tightly connected by spiral shell button, and described piston seat 10 passes through drum by piston 3
Connecting with standby pressure screw rod contact, convenient standby pressure screw rod rotates without unscrewing piston blot 9 at piston seat 10.
And described piston is by the O RunddichtringO 7 of piston 3 and described slurry cup 1 inner wall sealing；Described piston baffle ring
11 tops being arranged on slurry cup 1, and be fixed in slurry cup 1 by screw thread, described connecting rod 4 is by connecting rod spiral shell
Nail 5 is affixed with described slurry cup 1 wall spiral shell button.
Described piston 3 diameter 30-60mm；The height 150-250mm of slurry cup 1；Thickness 12-20mm,
And described slurry cup proof pressure is 25-35MPa.
Foam slurry high temperature high voltage resistant intensity maintenance slurry cup is to cooperate with foam slurry mixture slurry cup and uses
, additionally need and consisted of foam slurry by high-pressure nitrogen bottle, high pressure line, vent valve and stop valve and carry
For environment with pressure, foam slurry mixture slurry cup carries out foaming and slurry under the pressure that compression system improves,
In advance 2-base and 11-piston baffle all being tightened good seal, 4-connecting rod is fixed with 1-slurry cup by 5-screw
Good, that 2-base utilizes screw thread and 1-slurry cup good seal, the bottommost being positioned at slurry cup of piston when experiment starts.
Pre-mixed after by band pressure pipeline, foam slurry is entered maintenance by the horizontal access of threeway 8-valve rod
In slurry cup, because the pressure in slurry cup can be entered in slurry cup by valve rod less than compression system, foam slurry
And promote piston to move up, want the retrogressing of Non-follow control 12-standby pressure screw rod in order to control piston rate travel
Rate guarantee foam slurry can be uniformly injected in slurry cup, when 3 piston tops to the position of 11-piston baffle,
Disconnect the snap joint outside described threeway valve rod (8) horizontal access and bottom end seal nut screwing clamping is closed threeway
Valve；Turn on nut (5) and will take off for pressure screw rod (12) and connecting rod (4).
Example 1:
In foam slurry slurry cup, cement based pulp density 1.88g/cm3, foam by containing 0.3% foaming agent
Expanding foam solution high speed shear produce.Foam and cement mortar, with mass ratio for 5:100 mixture, pass through compression system
Foam slurry in slurry cup is injected high temperature height by rapid conversion joint by the pressure improving 0.3-0.5MPa
In pressure maintenance slurry cup, during injecting, regulation standby pressure screw rod simultaneously, it is ensured that enter High Temperature High Pressure maintenance
In slurry cup, foam slurry is uniform, does not has free gas to enter, it is ensured that the integrity of the Behavior of Hardened Cement Paste after maintenance.
Example 2
In foam slurry slurry cup, cement based pulp density 1.89g/cm3, foam by containing 0.3% foaming agent
Expanding foam solution high speed shear produce.Foam and cement mortar, with mass ratio for 3:100 mixture, pass through compression system
Foam slurry in slurry cup is injected high temperature height by rapid conversion joint by the pressure improving 0.3-0.5MPa
In pressure maintenance slurry cup, during injecting, regulation standby pressure screw rod simultaneously, it is ensured that enter High Temperature High Pressure maintenance
In slurry cup, foam slurry is uniform, does not has free gas to enter, it is ensured that the integrity of the Behavior of Hardened Cement Paste after maintenance.
Table 1: example 1 contrast and experiment
Table 2: example 2 contrast and experiment
Claims (7)
1. a high temperature high voltage resistant foam slurry intensity curing system, it is characterised in that: described system includes foam
Cement mortar high temperature high voltage resistant intensity maintenance slurry cup, foam slurry mixture slurry cup and pipeline with pressure；Described mixed
Cup with slurry carries out foam slurry foaming and slurry under described pipeline with pressure；Foamed cement after premixing afterwards
Starch in input with pressure described maintenance slurry cup, Behavior of Hardened Cement Paste is carried out intensity maintenance；
Described maintenance slurry cup is set to band laminated structure, is used for simulating down-hole high temperature and high pressure environment；Described knot with pressure
Structure arranges piston structure in using slurry cup；
Described maintenance slurry cup includes slurry cup (1), threeway valve rod (8), piston (3), piston seat (10)
With standby pressure screw rod (12)；Described threeway valve rod (8) is arranged in described slurry cup base (2), and described
Horizontal inlet and bottom end seal mouth it is provided with on threeway valve rod (8)；Described piston (3) is arranged on described
In slurry cup (1) inner chamber；Described standby pressure screw rod (12) one end is by described piston seat (10) and piston (3)
Contact connects；
Described maintenance slurry cup also includes one group of fixture and one group of sealing member；Described fixture includes base (2),
Base holding nut (14), piston blot (9), piston baffle ring (11), connecting rod (4) and connecting rod screw (5)；
Described sealing member includes base sealing screw (13), the O RunddichtringO (15) of threeway valve rod (8), base
(2) O RunddichtringO (6) and the O RunddichtringO (7) of piston (3)；
Described slurry cup (1) is tightly connected with base (2) screw thread, and by the O RunddichtringO of base (2)
(6) seal；Described threeway valve rod (8) is arranged in described base (2), and is sealed by described base
Screw (13) controls the opening and closing of described threeway valve rod (8), and described O RunddichtringO (15) seals described three
Logical valve rod (8)；Described piston blot (9) and piston (3) are affixed by spiral shell button, and described piston passes through
The O RunddichtringO (7) of piston (3) and described slurry cup (1) inner wall sealing；Described piston baffle ring (11)
Being arranged on the top of slurry cup (1), and be fixed in slurry cup (1) by screw thread, described connecting rod (4) passes through
Connecting rod screw (5) is affixed with described slurry cup (1) wall；
Described standby pressure screw rod (12) one end is connected by described piston seat (10) and piston (3) contact,
The other end is by spiral shell button through connecting rod (4), and the handle of described standby pressure screw rod (12) is arranged on described slurry cup (1)
Outward, it is used for controlling pressure；
Described system also includes that a high temperature and high pressure kettle, described maintenance slurry cup are put into described high temperature and high pressure kettle and carried out
Intensity maintenance.
A kind of high temperature high voltage resistant foam slurry intensity curing system the most according to claim 1, its feature exists
In:
Described pipeline with pressure includes elevated pressure nitrogen gas tank, high pressure line and control valve；Described mixture slurry cup is described
Carry out under the pressure environment of pipeline with pressure foaming and slurry.
A kind of high temperature high voltage resistant foam slurry intensity curing system the most according to claim 2, its feature exists
In:
The pressure limit of described pressure environment controls at 0.3-0.5MPa.
A kind of high temperature high voltage resistant foam slurry intensity curing system the most according to claim 1, its feature exists
In:
Described piston (3) diameter 30-60mm；The height 150-250mm of slurry cup (1)；Thickness 12-20
At mm, and described slurry cup (1) and screwed connection, proof pressure is 25-35MPa.
5. the method that the foam slurry intensity curing system using one of claim 1-4 described carries out maintenance, its
Being characterised by, described method includes:
Slurry step, described slurry step includes cement based slurry and foam mixture；It is close that described cement based is starched
Degree scope is 1.88-1.91g/cm3；Foam is the requirement according to foaming agent foam multiple, sending out by foaming agent
Bubble liquid high speed shear produces；Described mixed ratio is 0.3-0.5%；
Slurry input maintenance slurry cup step, described step include pre-mixed serosity by band pressure pipeline by foam
Cement mortar enters in maintenance slurry cup by the threeway horizontal access of threeway valve rod (8), during input, and foamed cement
Slurry can upwards migrate by valve rod and promote piston (3) to move up, mobile in order to control piston (3)
Rate hand controls the retrogressing speed of standby pressure screw rod (12), and described retrogressing speed is mixed according to foam and cement mortar
Join the difference of pressure, control at 1-3mm/s, it is ensured that foam slurry is uniformly injected in slurry cup, when piston (3)
When top is to the position of described piston baffle ring (11), disconnect outside threeway valve rod (8) threeway horizontal access is quick
The base sealing screw (13) of threeway lower end is also tightened closedown three-way valve by joint；Turn on connecting rod screw (5)
And will take off for pressure screw rod (12) and connecting rod (4), facilitate follow-up High Temperature High Pressure maintenance；
High Temperature High Pressure curing step, puts into height by the maintenance slurry cup taking off standby pressure screw rod (12) and connecting rod (4)
Temperature autoclave, carries out High Temperature High Pressure maintenance；Temperature 50-90 DEG C of maintenance, pressure limit is: 10-20MPa.
Method the most according to claim 5, it is characterised in that described method includes:
Cement is G level oil-well cement, and the n=0.3-0.5 of cement mortar after preparation, between K=0.9-1.5；Wherein,
N value is flow index, and K is consistency coefficient；Foaming agent is protein-based liquid blowing agent, sends out bubble times under normal pressure
Number is 18-25, and the height change half-life after formation of foam is about 1800s；The pitch of standby pressure screw rod is
4.8-6.0mm。
Method the most according to claim 5, it is characterised in that described method includes:
Described method also includes detecting step, and cement mortar injects maintenance slurry cup in the case of with pressure and passes through high temperature
After high-pressure curing molding formed Behavior of Hardened Cement Paste, Behavior of Hardened Cement Paste to be measured is taken out from maintenance slurry cup, measure its intensity and
Permeability.
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| CN109400205A (en) * | 2017-08-16 | 2019-03-01 | 中国石油化工股份有限公司 | A kind of cement slurry and its application, foamed cement system and its preparation |
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| CN110579424B (en) * | 2018-06-11 | 2021-10-22 | 中国石油化工股份有限公司 | Foam cement slurry pressure densimeter and slurry density measuring method |
| CN109025897B (en) * | 2018-10-22 | 2021-05-18 | 吉林大学 | Foaming type volume leaking stoppage device in well |
| CN109854286B (en) * | 2019-01-09 | 2021-06-04 | 三峡大学 | Visual test equipment and experimental method for ultrasonic-assisted pressure grouting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109400205A (en) * | 2017-08-16 | 2019-03-01 | 中国石油化工股份有限公司 | A kind of cement slurry and its application, foamed cement system and its preparation |
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| CN103510910A (en) | 2014-01-15 |
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