CN104650836B - A kind of horizontal cementing slurry for well - Google Patents
A kind of horizontal cementing slurry for well Download PDFInfo
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- CN104650836B CN104650836B CN201410814124.3A CN201410814124A CN104650836B CN 104650836 B CN104650836 B CN 104650836B CN 201410814124 A CN201410814124 A CN 201410814124A CN 104650836 B CN104650836 B CN 104650836B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
Abstract
The invention provides a kind of horizontal cementing slurry for well, one to include consisting of composition：Cement+toughener GZR+GFC swelling agent+GH retarder, the percentage by weight of described each composition is toughener GZR0.5% 2.5%, GFC swelling agents 1% 3%, GH retarder 0.04% 0.08%, and remaining is cement, zero free water, low dehydration；The Behavior of Hardened Cement Paste of formation does not shrink, and has certain expansion rate；Good Mechanical Behavior of Hardened Cement Paste, show excellent toughness.Behavior of Hardened Cement Paste High anti bending strength, crumbly coefficient is small, and toughness coefficient increase, Behavior of Hardened Cement Paste Young's modulus reduces, and Poisson's ratio increase, Behavior of Hardened Cement Paste bending radius reduces, and triaxial stress strain curve shows good elastoplasticity；The raising of anti-channeling ability.Shorten the thickening time, reduce time and channelling amount that formation fluid is intruded into inside cement mortar；Slurry is uniform and stable, good fluidity, helps to reduce inventionannulus flow resistance, improves the horizontal cementing slurry for well of displacement efficiency.
Description
Technical field
The invention belongs to horizontal cementing field, especially designs a kind of horizontal cementing slurry for well.
Background technology
Profit horizontal well is commonly referred to as directional well of the hole angle more than 86 °, and its wellbore trajectory is not only worn in oil-gas Layer
The certain length of row, and the contact area between oil and gas reservoir is also add, change drainage area, reduce oil gas
Flow velocity and pressure, it is the effective measures and Main Means of low permeability oil and gas field exploitation volume increase stable yields.
Since twentieth century nineties, World Water horizontal well drilling technology Rapid Popularization and popularization, raising oil field prospecting is turned into
Develop the important channel of comprehensive benefit.Nineteen ninety, foreign countries were drilled to 1290 mouthfuls of horizontal well, were 5.2 times in 1989；Nineteen ninety-five is drilled to
2590 mouthfuls of horizontal well, and increase by more than 1 times than nineteen ninety.At present, horizontal well drilling technology is ripe day by day and perfect in the world,
With different surface conditions, oilbearing stratum situation and exploration and development requirement, applied geology guiding technique, rotary steerable drilling system
System has been drilled to diversified horizontal well.
China is one of earliest several countries of developing water horizontal well drilling technology, and twentieth century the mid-1960s are beaten in Sichuan
Into 3 wells of mill and bar 24 well, two mouthfuls of water horizontal wells, but it is limited to technical merit at that time, does not obtain due benefit.Twentieth century 90
After age, Chinese Petroleum Enterprises have organized extensive tackling key problem during " eight or five ", great achievement are achieved, China's Horizontal Well Drilling
Well technology has pushed ahead major step, can not only bore conventional horizontal well, and can bore staged horizontal well, horizontal branch
The highly difficult horizontal well such as well, branch horizontal well.Oil sheet staged horizontal well, oil reservoir is average thick 0.6 meter, most thin 0.4m.
With deepening continuously for horizontal well development, higher requirement, horizontal cementing are proposed to horizontal cementing technology
When, need to solve the problems, such as the problems such as sleeve pipe tripping in, placed in the middle and Cutting Disposal, cement slurry water loss and bleed.In net horizontal section, because of weight
Power acts on, and sleeve pipe common trend forms narrow side ring sky in being close to low-side well bore, causes the low-side well bore during noting for cement mortar
Mud cake and drilling fluid displacing it is less efficient, easily formed alter groove, influence cementing quality.In addition, if the cement mortar of net horizontal section is deposited
In bleed, caused bleed is easily built up on the upside of well, is formed section and is influenceed cementing quality.This water band is in horizontal well
To be that separate zone production waterproof and sand control cause larger difficulty in recovery process.The dehydration of cement mortar needs to control during horizontal cementing
It is lower, lot of documents is introduced cement slurry water loss and should controlled within 50ml, the cementing quality for the well that is so advantageous to improve the standard.
The presence of cutting bed is inevitable that this not only influences the safety of wellbore construction in drilling process, also influences well cementation matter
Amount.The well preparatory stage before well cementation, it is necessary to remove cutting bed clean.With reference to stratum characteristic and technical capability, take
High angle and net horizontal section, per drilling well 50-60m, short by pumping for drilling tool, is destroyed cutting bed next time, and
High flow rate washover, landwaste is discharged, improve drilling fluid ratio of dynamic shear force/yield value to plastic viscosity, strengthened its suspension, prop-carrying capacity, to be carried than common straight well or inclined shaft
High 30-50%.It is smooth that frequent short trip also helps the borehole wall, is created conditions for later setting of casing.Because Action of Gravity Field,
In horizontal segment drilling process, drilling cuttings, which will be deposited on low-side well bore and be accumulated as thicker false mud cake, forms cutting bed, if not removing
Totally, then after sealing, this cutting bed also will be oil, gas and water alter and passage is provided, for horizontal well separate zone production leave it is larger
Hidden danger, serious causes horizontal well engineering to be scrapped.
Generally practical traditional cements poor toughness at present, it is impossible to elastic flow occurs, it is impossible to preferably after resistance well cementation
The perforation and fracturing work of phase, it is impossible to the integrality of cement sheath is maintained, in addition, the stabilization of horizontal cementing mortar architecture
Property it is poor, it is impossible to enable cement granules in mortar architecture effectively dispersed without settling, so as to prevent horizontal segment cement
Slurry forms passage in flash, and then prevents mutual the problems such as altering between the fluid of horizontal segment.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of cement mortar of stabilization, zero free water, low dehydration；The Behavior of Hardened Cement Paste of formation
Do not shrink, and there is certain expansion rate；Good Mechanical Behavior of Hardened Cement Paste, show excellent toughness.The anti-folding of Behavior of Hardened Cement Paste is strong
Degree is high, and crumbly coefficient is small, and toughness coefficient increase, Behavior of Hardened Cement Paste Young's modulus reduces, and Poisson's ratio increase, Behavior of Hardened Cement Paste bending radius subtracts
Small, triaxial stress strain curve shows good elastoplasticity；The raising of anti-channeling ability.Shorten the thickening time, reduce ground laminar flow
The time and channelling amount that body is intruded into inside cement mortar；Slurry is uniform and stable, good fluidity, helps to reduce inventionannulus flow resistance
Power, improve the horizontal cementing slurry for well of displacement efficiency.
To achieve the above object, the present invention uses following technical scheme, and a kind of horizontal cementing slurry for well, one includes consisting of
Composition：Cement+toughener GZR+GFC swelling agent+GH retarder, the percentage by weight of described each composition is toughener
GZR0.5%-2.5%, GFC swelling agent 1%-3%, GH retarder 0.04%-0.08%, remaining is cement.
Also include GSJ fluid loss agents and USZ dispersants, the percentage by weight shared by described GSJ fluid loss agents is
0.2%-0.4%, the percentage by weight shared by the USZ dispersants is 0.04%-0.08%.
Described GZR toughener is made up of resilient particulate materials, anti-fracture material and impervious material, described elasticity
Grain material, anti-fracture material and impervious material are according to 20:1.5:1.5 ratios mix.
Described swelling agent is percentage by weight composition sodium chloride 1.2%, the sodium thiosulfate according to following composition
1.5%th, Nekal BX 0.3%, water reducer JN0.4%, ammonium chloride 0.8%, aluminium powder 0.005%, iron powder 95%.
Described GH retarder is sucrose, glucose, toramil B or sodium salt, sodium carboxymethylcellulose, carboxyethyl
The one or two or more kinds of mixture of cellulose.
Described GSJ fluid loss agent carboxymethyl vitamins or ethoxy vitamin or carboxy methyl hydroxyethyl vitamin.
The percentage by weight of described cement+toughener GZR+GFC swelling agent+GH retarder each components is toughener
GZR2.0%+GFC swelling agent 2%+GH retarder 0.06%, remaining is cement.
Percentage by weight shared by described GSJ fluid loss agents is 0.3%, the weight percent shared by the USZ dispersants
Than being 0.06%.
The present invention uses above-mentioned technical proposal, has advantages below：
1. stable mortar architecture, zero free water, low dehydration.
2. the Behavior of Hardened Cement Paste formed does not shrink, and has certain expansion rate.
3. good Mechanical Behavior of Hardened Cement Paste, show excellent toughness.Behavior of Hardened Cement Paste High anti bending strength, crumbly coefficient is small,
Toughness coefficient increases, and Behavior of Hardened Cement Paste Young's modulus reduces, and Poisson's ratio increase, Behavior of Hardened Cement Paste bending radius reduces, and triaxial stress strain is bent
Line shows good elastoplasticity.
4. the raising of anti-channeling ability.Shorten the thickening time, the time and alter that reduction formation fluid is intruded into inside cement mortar
Flow.
5. slurry is uniform and stable, good fluidity, helps to reduce inventionannulus flow resistance, improve displacement efficiency.
Brief description of the drawings
Fig. 1 is the Behavior of Hardened Cement Paste stress-strain diagram that dosage of the present invention is 0%GZR-1；
Fig. 2 is the Behavior of Hardened Cement Paste stress-strain diagram that dosage of the present invention is 1.0%GZR-1；
Fig. 3 is the Behavior of Hardened Cement Paste stress-strain diagram that dosage of the present invention is 1.5%GZR-1；
Fig. 4 is the Behavior of Hardened Cement Paste stress-strain diagram that dosage of the present invention is 2.0%GZR-1；
Fig. 5 is the relation of swelling agent dosage of the present invention and net linear expansion rate；
Fig. 6 is the expansion rate and the relation of time of " crystal " swelling agent in the present invention；
Fig. 7 is 55 DEG C of thickening time curves of microdilatancy anti fluid channeling cement slurry system of the present invention；
Fig. 8 is 60 DEG C of thickening time curves of microdilatancy anti fluid channeling cement slurry system of the present invention；
Fig. 9 is toughness leakage-proof mud anti-channeling performance appraisal curve of the present invention.
Embodiment
Further a kind of horizontal cementing slurry for well is described in detail for example below.
Embodiment 1
A kind of shown horizontal cementing slurry for well, including consisting of composition：Cement+toughener GZR+GFC swelling agents+GH delays
Solidifying agent, the percentage by weight of described each composition is toughener GZR0.5%-2.5%, GFC swelling agent 1%-3%, GH slow setting
Agent 0.04%-0.08%, remaining is cement.Also include GSJ fluid loss agents and USZ dispersants, described GSJ fluid loss agents institute
The percentage by weight accounted for is 0.2%-0.4%, and the percentage by weight shared by the USZ dispersants is 0.04%-0.08%.Using
This formula, following performance evaluation is made to this cement mortar
1st, toughness evaluation：
The toughness anti fluid channeling cement slurry system traditional performance of table 1 is evaluated：
2nd, expansion character is evaluated
Table 2 mixes the expansion test of different dosage GFC swelling agents at different temperatures
From Table 2, it can be seen that lattice dilatation material GFC is different (0.5%~1.5%) in dosage, (40 DEG C of different temperatures
~70 DEG C) certain expansion effect is shown, and it is more obvious with the increase of dosage, the rise of temperature, expansion effect.
Embodiment 2
On the basis of embodiment 1, described GZR toughener is by resilient particulate materials, anti-fracture material and antiseepage material
Material composition, described resilient particulate materials, anti-fracture material and impervious material are according to 20:1.5:1.5 ratios mix, institute
The resilient particulate materials stated select TPR property material of thermoplastic elastomer (TPE) of Dongguan Jea Plastic Technology Co., Ltd., described
Anti-fracture material is waste rubber grain, and described impervious material is polyethylene；
It is the performance evaluation to individual increasing tougheness material below, the Behavior of Hardened Cement Paste Young's modulus Poisson's ratio under different dosages
It is cement slurry main material to determine toughening material GZR-1, changes its dosage in cement, measures Behavior of Hardened Cement Paste
It can see the table below：
Cement properties are tested under 3 different dosages of table
Experiment condition：60℃/24h；The ratio of mud：0.44.
As can be seen from Table 3, with the increase of GZR-1 dosages, the toughness that Behavior of Hardened Cement Paste is shown gradually strengthens, but works as dosage
When >=3.0%, cement strength is too low.
(2) Behavior of Hardened Cement Paste ess-strain performance comparision under different dosages
Interior is respectively that 0%, 1.0%, 1.5%, 2.0% Behavior of Hardened Cement Paste compares to GZR-1 dosages,
As the increase of GZR-1 dosages, Behavior of Hardened Cement Paste ess-strain performance gradually strengthen it can be seen from figure Fig. 1 to Fig. 4,
Show good elastoplasticity.When dosage is 2.0%, Behavior of Hardened Cement Paste elastic deformation has reached 0.95%, and Behavior of Hardened Cement Paste plastic deformation reaches
To more than 5.0%.
Anti-fracture material is preferred
The anti-fracture material of the excellent band branched high molecular of swellability is added in cement mortar, it is uniformly divided in cement mortar
Cloth, network structure is formed, to improve Behavior of Hardened Cement Paste rupture strength.
Interior has carried out performance comparision test to different preventing breakable material, is shown in Table 4：
The different preventing breakable material performance comparision of table 4
As can be seen from Table 4, anti-fracture material GZR-2 is obviously improved to Behavior of Hardened Cement Paste rupture strength, Behavior of Hardened Cement Paste crumbly coefficient
It is low, show good anti-fracture ability.
Anti-fracture material GZR-2 performance evaluations
The indoor performance to anti-fracture material GZR-2 is evaluated, and evaluation result is shown in Table 5：
Table 5GZR-2 performance evaluations
As can be seen from Table 5, as GZR-2 increase, Behavior of Hardened Cement Paste rupture strength improve constantly, GZR-2 optimum add amount
For 0.15%.
Impervious material is preferred
To improve Behavior of Hardened Cement Paste body complete seal, Behavior of Hardened Cement Paste permeability is reduced, prevents stratum and downhole well fluid in water
Channelling in mudstone matrix, ultra-fine impervious material is introduced into mortar architecture, according to theory of high packing and grain composition principle,
Improve Behavior of Hardened Cement Paste compactness.Interior compares to 3 kinds of ultra-fine impervious materials, and performance is as follows：
The ultra-fine impervious material performance comparision of table 6
Impervious material GZR-3 is best to improvement Behavior of Hardened Cement Paste permeability effect it can be seen from upper table 6, the Behavior of Hardened Cement Paste of formation
Permeability is minimum, reaches 0.038mD.
Impervious material GZR-3 performance evaluations
Different amounts of GZR-3 is added in mortar architecture, test GZR-3 influences on cement properties：
The impervious material performance evaluation of table 7
As can be seen from Table 7, as the increase of impervious material dosage, Behavior of Hardened Cement Paste permeability reduction, impervious material most preferably add
Measure as 0.15%.
Embodiment 3
Described swelling agent is percentage by weight composition sodium chloride 1.2%, the sodium thiosulfate according to following composition
1.5%th, Nekal BX 0.3%, water reducer JN0.4%, ammonium chloride 0.8%, aluminium powder 0.005%, iron powder 95%, sodium chloride are
Industrial salt；Sodium thiosulfate；It is used as alkalinity additive in this agent, Nekal BX hair dye, is used as dispersant in this agent；Diminishing
Agent JN also known as methyl naphthalene sulfonate formaldehyde condensate, chocolate brown powder；Soluble in water, stable chemical performance is non-ignitable, nontoxic.With
Make cement additire, there is strong peptizaiton to cement granules, expand the contact area of cement and water, promote aquation anti-
Should, water consumption is reduced, improves the intensity, density and impermeability of concrete.From industrial goods.Ammonium chloride dairy equipment cleans
Agent.Used as stabilizers is used in this agent；Aluminium powder anti-corrosive paint of epoxy resin, it is used as gas-forming agent in this agent；Iron powder silvery white non-ferrous metal,
Powdery is ground into by pure iron, is soluble in hydrochloric acid, sulfuric acid and dust technology, has reproducibility, is used as gas-forming agent in this agent.
Embodiment 4
It is preferred to expand agent material
Utilize the linear expansion rate of cement and expanded test apparatus measure " crystal " swelling agent.Result of the test shows, suitable
Dosage in the range of, mixed with GP1, GP2, GP3, GFC cement mortar compared with the magma with the conditions of, there is good expansion to imitate
Fruit, " chemical shrinkage " after effective compensation cement slurry sets." crystal " swelling agent dosage is generally 1.0%~3.0%, cement
The net linear expansion rate of stone (is shown in Table 8, Fig. 6) more than 2.5%.With the increase of swelling agent dosage, cement linear expansion rate increases,
When swelling agent is added to a certain degree, its trend expanded is intended to gently.Swelling agent dosage is when within 3.0%, GFC expansions
Effect is better than GP1, GP2, GP3.
Influence of the oil well cement swelling agent dosage of table 8 to cement and expanded performance
Swelling agent performance evaluation
(1) influence of the time to swelling agent expansion rate
For influence of the minute to swelling agent expansion rate, filled using the cement volume swelling rate test voluntarily developed
Put.Experiment shows, mixed with swelling agent cement mortar with the extension of time, its expansion effect is different.Expanded mixed with " crystal "
For the cement mortar of agent before initial set, its cement mortar is in the trend for first expanding after-contraction, but is theed cement solidifies in initial set between final set
Transition stage is in contraction state, and magma shrinkage ratio is shunk added with the cement mortar of swelling agent wants greatly to refer to Fig. 6 more.
(2) influence of the swelling agent to compression strength
Influence result of the test of the swelling agent to compression strength is shown in Table 3-10, and GP1, GP2, GP3, GFC energy are understood by table 3-10
The compression strength of Behavior of Hardened Cement Paste is increased substantially, 70 DEG C/24h of normal pressure intensity is more than 21MPa, compared with the magma with the conditions of, its
Intensity level can improve more than 15%, even as high as 70%.
Influence of the swelling agent of table 9 to compression strength
(3) influence of the swelling agent to cement mortar initial consistency and Free water：
Experiment proves, slightly has thickening behavior mixed with the cement mortar of swelling agent, its fluidity also accordingly reduces, but initial consistency
It can be controlled within 20Bc.In general, swelling agent is seldom used alone in cement-slurry method, generally with fluid loss additive, scattered
Agent etc. is used in combination, and can make the superior mortar architecture of combination property.
" crystal " swelling agent GP1, GP2, GP3, GFC can reduce the precipitation of cement mortar Free water, and its free water content is less than
0.5%, even 0 (being shown in Table 3-11).This explanation swelling agent can effectively reduce cement mortar free water content, help to improve cement
The settlement stability performance of slurry, has a wide range of applications in horizontal well and high angle hole.
Influence of the swelling agent dosage of table 10 to Free water
It can be seen that by above-mentioned data：
(1) " crystal " swelling agent dosage is generally 1%~3%, and the net linear expansion rate of Behavior of Hardened Cement Paste can be made to be more than 4%.
(2) " crystal " swelling agent can effectively reduce cement mortar free water content (less than 0.5%, even 0).
(3) " crystal " swelling agent GFC properties under same experimental conditions are better than GP1, GP2, PG3.
Embodiment 5
The percentage by weight of described cement+toughener GZR+GFC swelling agent+GH retarder each components is toughener
GZR2.0%+GFC swelling agent 2%+GH retarder 0.06%, remaining is cement.Weight shared by described GSJ fluid loss agents
Percentage is 0.3%, and the percentage by weight shared by the USZ dispersants is 0.06%.GH retarder is sucrose, glucose, wood
Matter sulfonic acid calcium salt or sodium salt, sodium carboxymethylcellulose, the mixture of carboxyethyl cellulose one or two or more kinds.Described GSJ
Fluid loss agent carboxymethyl vitamin or ethoxy vitamin or carboxy methyl hydroxyethyl vitamin, described dispersant are allyl ethers
Ester monomer
Formula and performance evaluation
By the preferred lattice dilatation agent material GFC of Lab-evaluation, stable expansion is kept in the different phase of hydrated cementitious,
Continue to produce small expansion in Cheng Shihou, effectively reduce because the contraction of Behavior of Hardened Cement Paste volume causes the risk of annular space oil gas water breakthrough.
G level oil-well cement+2.0%GZR+2.0%GFC swelling agent+0.3%GSJ fluid loss agent+0.3%USZ dispersants+
0.06%GH
The toughness anti fluid channeling cement slurry system traditional performance of table 11 is evaluated
Expansion character is evaluated
Table 12 mixes the expansion test of different dosage GFC swelling agents at different temperatures
Lattice dilatation material GFC is different (0.5%~1.5%) in dosage it can be seen from the evaluating data of table 12, not equality of temperature
Degree (40 DEG C~70 DEG C) shows certain expansion effect, and brighter with the increase of dosage, the rise of temperature, expansion effect
It is aobvious.
Anti-channeling performance is evaluated
Anti-channeling performance evaluation is carried out to toughness anti fluid channeling cement slurry formula, using thousand De Le companies oil gas water breakthrough sunykatuib analysis instrument
Evaluated.
It is short that toughness anti fluid channeling cement slurry system transition time is can be seen that from Fig. 7,8 and Fig. 9, can effectively resist extraneous current
The invasion of body；
1. stable mortar architecture, zero free water, low dehydration.
2. the Behavior of Hardened Cement Paste formed does not shrink, and has certain expansion rate.
3. good Mechanical Behavior of Hardened Cement Paste, show excellent toughness.Behavior of Hardened Cement Paste High anti bending strength, crumbly coefficient is small,
Toughness coefficient increases, and Behavior of Hardened Cement Paste Young's modulus reduces, and Poisson's ratio increase, Behavior of Hardened Cement Paste bending radius reduces, and triaxial stress strain is bent
Line shows good elastoplasticity.
4. the raising of anti-channeling ability.Shorten the thickening time, the time and alter that reduction formation fluid is intruded into inside cement mortar
Flow.
5. slurry is uniform and stable, good fluidity, helps to reduce inventionannulus flow resistance, improve displacement efficiency.
Claims (2)
1. a kind of horizontal cementing slurry for well, it is characterised in that including consisting of composition：Cement+toughener GZR+GFC swelling agents+
GH retarder, the percentage by weight of described each composition are toughener GZR0.5%-2.5%, GFC swelling agent 1%-3%, GH
Retarder 0.04%-0.08%, remaining is cement；Also include GSJ fluid loss agents and USZ dispersants, described GSJ drop dehydrations
Percentage by weight shared by agent is 0.2%-0.4%, and the percentage by weight shared by the USZ dispersants is 0.04%-0.08%；
Described GZR toughener is made up of resilient particulate materials, anti-fracture material and impervious material, described elastic granule material
Material, anti-fracture material and impervious material are according to 20:1.5:1.5 ratios mix；
Described GH retarder is sucrose, glucose, toramil B or sodium salt, sodium carboxymethylcellulose, carboxyethylcellulose
Plain one or two or more kinds of mixture；
Described GSJ fluid loss agents are carboxymethyl vitamin or ethoxy vitamin or carboxy methyl hydroxyethyl vitamin.
2. horizontal cementing slurry for well according to claim 1, it is characterised in that the weight shared by described GSJ fluid loss agents
Percentage is 0.3%, and the percentage by weight shared by the USZ dispersants is 0.06%.
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| CN103361041A (en) * | 2013-08-09 | 2013-10-23 | 卫辉市化工有限公司 | Preparation method of high-density anti-gas-channeling well-cementing cement slurry |
| CN103980871A (en) * | 2014-05-29 | 2014-08-13 | 中国石油集团渤海钻探工程有限公司 | Low-elastic-modulus temperature-resistant tough oil-well cement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022221659A1 (en) * | 2021-04-15 | 2022-10-20 | Saudi Arabian Oil Company | Lignosulfonate and hydrolyzed carbohydrate retarder additive for cement mixture |
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Effective date of registration: 20201030 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: Company No. 151 Changqing building cementing Weiyang road 710021 Shaanxi city of Xi'an Province Patentee before: Changqing cementing company of CNPC Chuanqing Drilling Engineering Co.,Ltd. |