CN102504782B - Light-bead leakage-proof cement paste for well cementation and manufacturing technology - Google Patents
Light-bead leakage-proof cement paste for well cementation and manufacturing technology Download PDFInfo
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- CN102504782B CN102504782B CN2011103710719A CN201110371071A CN102504782B CN 102504782 B CN102504782 B CN 102504782B CN 2011103710719 A CN2011103710719 A CN 2011103710719A CN 201110371071 A CN201110371071 A CN 201110371071A CN 102504782 B CN102504782 B CN 102504782B
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Abstract
The invention relates to light-bead leakage-proof cement paste for well cementation and a manufacturing technology; the light-bead leakage-proof cement paste is characterized in that the light-bead leakage-proof cement paste is compounded by G-grade oil-well cement and light beads according to a weigh proportion, wherein the G-grade oil-well cement accounts for 60-90 parts, the light beads accounts for 10-40 pats and water accounts for 65-95 parts. The light-bead leakage-proof cement paste aims at overcoming the defects of the prior art. The volume of the light-bead leakage-proof cement paste system provided by the invention obviously changes along with the change of pressure so that the system density of the cement paste can be effectively reduced, and the cementation quality of cement stones can also be increased; when leakage happens, the light-bead leakage-proof cement paste has the effects of leakage slowdown and leaking stoppage.
Description
Technical field
The present invention relates to a kind of light-bead leakage-proof cement paste for well cementation and preparation technology.
Background technology
Existing mortar architecture can cause that leakage is serious, cement lowly returns, the sealing of part oil reservoir is of poor quality or oil reservoir leaks envelope, namely when cement slurry density when crushing the equal yield density on stratum, will press Lou the stratum to miss, make cement return not high, if but the density of this mortar architecture is when too low, the Behavior of Hardened Cement Paste bonding quality will variation, causes the cementing quality problem; Use Portland cement slurry system well cementation Main Problems to have:
1, the mortar architecture density of common sealing oil reservoir is high, all greater than 1.85 g/cm
3, easily press and leak bearing capacity lower stratum;
2, the volume of common low weight cement slurry along with pressure change is not obvious, can not effectively slow down and stop leakage in well cementing process;
3, fly ash low density cement mortar body poor stability, density are generally at 1.45 g/cm
3The left and right, the thickening time, condensate rate demixing phenomenon easily occurred in 10% left and right greater than 350min.
Summary of the invention
The invention provides a kind of light-bead leakage-proof cement paste for well cementation and preparation technology, to overcome the defective that exists in prior art.Use the volume of light pearl lost circulation prevention mortar architecture of the present invention along with pressure change is obvious, can not only effectively reduce mortar architecture density and improve the Behavior of Hardened Cement Paste bonding quality, and can play when leakage occurs and slow down leakage and leak stopping effect.
Technical solution of the present invention is: a kind of light-bead leakage-proof cement paste for well cementation is characterized in that:
By G level oil well cement and light pearl composite forming by weight proportion, wherein:
60-90 parts of G level oil well cements;
10-40 parts, light pearl;
65-95 parts, water.
70 parts of G level oil well cements;
30 parts, described light pearl.
75 parts of G level oil well cements;
25 parts, described light pearl.
Described light pearl is that particle diameter have larger specific surface area, and water-intake rate is low at 30-80 μ m by the composite lightening material that forms of sial super light material composition.
A kind of method for preparing as above-mentioned light-bead leakage-proof cement paste for well cementation is characterized in that, comprises following steps:
1) according to the performance requriementss such as density, thickening time, free-water and ultimate compression strength of required grout, determine dosage ratio and the weight of G level oil well cement and light pearl;
2) utilize dry mixing device, add G level oil well cement and light pearl according to the weight of determining, the dosage of light pearl is controlled at 15%-40% of gross weight carries out composite;
3) be dry mixed environment and will guarantee dry the ventilation, in case cement and light pearl suction are made moist and go bad;
Come the density of the hierarchy of control when 4) preparing grout by regulating pondage and ash amount.
The density of described mortar architecture is 1.24g/cm
3-1.60g/cm
3
The described thickening time is greater than 180min;
Described free-water volume ratio is 1.6%-4.1%;
Described ultimate compression strength is that 24 hours ultimate compression strength is greater than 4MPa;
Described water-solid ratio is 0.65-0.95;
The dosage of described light pearl accounts for 10%-40% of gross weight.
The technology of the present invention effect is:
1, add light pearl that this system has been possessed and slow down in well cementing process and stop the ability of missing, during on-the-spot the use, can effectively control cement slurry density directly by controlling water-solid ratio, avoid pressure to leak the stratum.
2, the grain composition between cement and light pearl makes and realizes tightly packedly between particle, improves the solid phase amount in the unit volume grout, thereby has increased paste structure intensity;
3, the nominal particle size of light pearl is tightly packed with forming of cement granules, has improved the pore texture of Behavior of Hardened Cement Paste, makes the porosity reduction;
4, the hydroxy water soluble polymer that contains in light pearl component is adsorbable in cement particle surface, forms the absorption hydration layer, makes cement granules generation bridge joint and forms reticulated structure, thereby fettered more free water;
5, silica fiber tissue and the hydroxy polymer hydration layer in mortar architecture formed liquid barrier and infiltrated film, effectively limited the motion of liquid phase in slurry, and the homogeneity of Behavior of Hardened Cement Paste is improved, and perviousness reduces.
Description of drawings
The invention will be further described below in conjunction with embodiment, but not as a limitation of the invention:
Fig. 1 is the tentative module Electronic Speculum;
Fig. 2 is the tentative module Electronic Speculum;
Fig. 3 is that cement granules generation bridge joint forms the reticulated structure schematic diagram.
Embodiment
The present invention relates to a kind of mortar architecture, particularly light pearl lost circulation prevention mortar architecture.It is by G level oil well cement and light pearl composite forming by weight proportion, wherein:
60-90 parts of G level oil well cements;
10-40 parts, light pearl;
65-95 parts, water.
this system stable performance, degree of mobilization 20-23cm, viscosity is low, consistency index K value＜1, thermostability and erosion resistance are good, control cement slurry density and cement strength by dosage and the water-solid ratio of regulating light pearl, utilize simultaneously light pearl volume with pressure to change telescopic characteristic, make grout in the process of being missed to low pressure end by high-pressure side, reduce to make volume to produce a certain amount of expansion with pressure, make this system possess to slow down and stop the ability of leakage, can " alleviate " in force and the combination in addition of " leak stopping " two technology, form a kind of novel lost circulation prevention mortar architecture.
G level oil well cement and light pearl are carried out composite obtaining according to a certain percentage; Dosage by regulating light pearl and water ash solid than, can control mud density at 1.24g/cm
3-1.60g/cm
3Between, utilize simultaneously light pearl volume with pressure to change telescopic characteristic, make grout in the process of being missed to low pressure end by high-pressure side, reduce with pressure, light pearl volume produces a certain amount of expansion, thereby plays the effect that slows down and stop leakage, improve Formation bearing pressure, guarantee cementing quality.
The dosage of light pearl accounts for 15%-40% of gross weight, use the grain composition principle, optimize the weight proportion of size fractionated, make realize between particle tightly packed, improve the solid load in the unit volume grout, guaranteeing under the stable prerequisite of mortar architecture that density and thickening time that the dosage by regulating light pearl and water-solid ratio are controlled grout are improved cement strength.
The present invention controls the density of mortar architecture and the intensity of Behavior of Hardened Cement Paste by regulating dosage and the water-solid ratio of light pearl.When light pearl dosage constantly increased, water consumption also increased thereupon, and cement slurry density constantly descends, and intensity also reduces thereupon, and therefore according to the difference of working conditions, the dosage with light pearl when composite is controlled at 10%-40% of total amount.
Embodiment 1: this light-bead leakage-proof cement paste for well cementation, by G level oil well cement and light pearl composite forming by weight proportion, wherein:
70 parts of G level oil well cements;
30 parts, light pearl;
80 parts, water;
G level oil well cement (this cement, national cement producer has, and is general purpose material), light pearl is buied from Qingyang District, Gansu Province illuminate brightness building materials raw material company limited, phone: 0934-6659691 mobile phone: 15109342598.
Described light pearl is by the composite lightening material that forms of sial super light material composition, and particle diameter have larger specific surface area, and water-intake rate is low at 60 μ m.So the cement slurry of preparation has good mobility and stability, it can improve the high thermal resistance of Behavior of Hardened Cement Paste simultaneously, prevented the decline of cement strength under hot conditions, thermostability and the erosion resistance of Behavior of Hardened Cement Paste have been improved, undertaken composite by grain composition principle (belonging to industry known technology) G level oil well cement and light pearl during use, be about to two kinds of different-grain diameter materials and mix in proportion, form an organic whole.The inside of light pearl is porous organization's structure, and marshalling, not connected, its volume with pressure variation has certain scalability, and grout to miss in the stratum be to be missed to low pressure end by high-pressure side, therefore along with external pressure reduces, light pearl volume produces a certain amount of expansion, constantly pile up to form at leakage crack place and stop up, make this mud possess to slow down and stop the ability of missing.
Described light pearl has two kinds of effects: the firstth, regulate the density of mortar architecture and the intensity of Behavior of Hardened Cement Paste; The secondth, utilize light pearl volume with pressure to change telescopic characteristic, the leakproof of refinforced cement slurry system, plugging effect; The dosage of light pearl requires to add according to the industry known technology.
Prepare the method for above-mentioned light-bead leakage-proof cement paste for well cementation, comprise following steps:
1) selecting the density of required grout is 1.4g/cm
3Thickening time 280min;
The free-water volume ratio is 2.6%; Ultimate compression strength is 24 hours ultimate compression strength 5MPa;
Water-solid ratio is 0.75; The dosage of light pearl accounts for 30% of gross weight.
2) utilize dry mixing device, (equipment adopt the industry general-purpose equipment) adds G level oil well cement and light pearl, the dosage of light pearl is controlled at 30% of gross weight carries out composite;
3) be dry mixed environment and will guarantee dry the ventilation, in case cement and light pearl suction are made moist and go bad;
Come the density of the hierarchy of control when 4) preparing grout by regulating pondage and ash amount.
Light pearl is extra material in this system, when being dry mixed, G level oil well cement and light pearl are added according to the above ratio, the dosage of light pearl is controlled at 30% of total amount, during the preparation grout, the water-solid ratio of system is controlled at 0.75, (being 0.75 consistent with above-mentioned water-solid ratio) regulates cement slurry density at 1.4 ± 0.03g/cm
3Scope in; Use simultaneously indoor assay device to check check to the performance of mortar architecture, whether the performance index such as test system density, cement strength, thickening time, mobility can satisfy the cementing technology requirement, confirm can use after indices reaches design requirements.
During site operation, use the mixed slurry equipment in ground according to industry known technology require the water ash (Gu) than carrying out with slurry, by the water supply of adjustment equipment with for the ash amount, cement slurry density is controlled in the scope of technical requirements, avoid pressing in well cementing process and leak the stratum, and by surface pipeline with design discharge capacity turbulence replacement, will carry out well cementing operation in the grout Injection Well.
Allotment test and performance measurement:
On the basis of satisfying the required cement slurry density value of equilibrium pressure well cementation, satisfy water mudrock structure intensity 〉=3.5 Mpa/48h * 55 ℃, and can keep under the prerequisite of slurry performance relative stability, optimize the major subjects that has just become laboratory study with screening cement and the best compatibility relationship that alleviates the pearl material, the laboratory formula test is as follows, sees Table 1, table 2.
Light bead low-density cement mortar formula test table 1
Light bead low-density cement mortar screening formulation test card 2
Experiment conclusion:
1, when light pearl dosage constantly increases, cement slurry density constantly descends, and intensity also reduces thereupon.
2, to reduce cement slurry density, not only will increase light pearl dosage, will increase water cement ratio simultaneously.
3, when light pearl light-weight additive dosage reaches 35%, cement slurry density drops to 1.32 g/cm
3The time, water mudrock structure intensity＞3.5 Mpa/48h * 55 ℃, free-water＜4%.
4, grout is inserted in the Glass tubing of diameter 25 mm, long 250 mm, Glass tubing is in plumbness after maintenance 48h under normal pressure, 55 ℃ of conditions, test specimen is divided into 5 sections test densitys respectively, judged the stability of grout by each section density difference, result shows the poor 0.02g/ of the only having cm of maximum density on vertical direction
3, being evenly distributed, mortar architecture is stable.
Tentative module Electronic Speculum Fig. 1 and Fig. 2 have proved that further the grain composition between cement and light pearl has strengthened paste structure intensity, silica fiber tissue and hydroxy polymer hydration layer have limited the motion of liquid phase in slurry effectively, and the homogeneity of Behavior of Hardened Cement Paste is improved.
5, the thickening time＞180min of light bead low-density cement mortar can be found out from above thickening time testing data, site safety workability parameter request can be satisfied fully.
6, light bead low-density cement system stable performance, good fluidity, viscosity and consistency index are all lower, easily replace.The nominal particle size of light pearl and the good grating effect of cement granules, improved the pore texture of Behavior of Hardened Cement Paste, porosity is reduced, and the hydroxy water soluble polymer that contains in light pearl component is adsorbable in cement particle surface, forms the absorption hydration layer, make cement granules generation bridge joint and form reticulated structure, thereby fettered more free water, stopped up space between cement granules, reduced the perviousness of cement filter cake, rate of permeation is significantly descended, see Fig. 3 for details.
7, thermostability, the erosion resistance of light bead low-density cement system.Because light pearl contains the super light materials such as sial, improved the high thermal resistance of Behavior of Hardened Cement Paste, particularly be applied to the sealing of high temperature deep well section, can effectively prevent the decline of the cement strength that high temperature causes, reduce that Behavior of Hardened Cement Paste is passed in time and the strength retrogression that causes, greatly improved weather resistance and the erosion resistance of Behavior of Hardened Cement Paste.
Embodiment 2:
Concrete preparation process difference identical from embodiment 1 is to select parameter different:
60 parts of G level oil well cements;
10 parts, light pearl;
65 parts, water.
Light bead footpath is at 30 μ m,
The density of described mortar architecture is 1.24g/cm
3
Described thickening time 180min;
Described free-water volume ratio is 1.6%;
Described ultimate compression strength is 24 hours ultimate compression strength 4MPa;
Described water-solid ratio is 0.65;
The dosage of described light pearl accounts for 10% of gross weight.
Embodiment 3:
Concrete preparation process is identical with embodiment 1, and difference is to select parameter different:
90 parts of G level oil well cements;
40 parts, light pearl;
95 parts, water;
Light bead footpath is at 80 μ m,
The density of mortar architecture is 1.60g/cm
3
Described thickening times 300 min;
Described free-water volume ratio is 4.1%;
Described ultimate compression strength is that 24 hours ultimate compression strength is greater than 7MPa;
Described water-solid ratio is 0.95;
The dosage of described light pearl accounts for 10%-40% of gross weight.
Embodiment 4:
Concrete preparation process is identical with embodiment 1, and difference is to select parameter different:
Light bead footpath is at 40 μ m,
75 parts of G level oil well cements;
25 parts, described light pearl;
78 parts, water.
The density of described mortar architecture is 1.5g/cm
3
The described thickening time is greater than 400min;
Described free-water volume ratio is 3%;
Described ultimate compression strength is that 24 hours ultimate compression strength is greater than 6MPa;
Described water-solid ratio is 0.75;
The dosage of described light pearl accounts for 30% of gross weight.
Embodiment 5:
Concrete preparation process is identical with embodiment 1, and difference is to select parameter different:
60 parts of G level oil well cements;
40 parts, light pearl;
85 parts, water;
Light bead footpath is at 70 μ m,
The density of described mortar architecture is 1.24g/cm
3
Described thickening time 180min;
Described free-water volume ratio is 4.1%;
Described ultimate compression strength is that 24 hours ultimate compression strength is greater than 4MPa;
Described water-solid ratio is 0.65;
The dosage of described light pearl accounts for 10% of gross weight.
Claims (1)
1. light-bead leakage-proof cement paste for well cementation is characterized in that:
Formed by following part by weight is composite by G level oil well cement and light pearl, wherein:
75 parts of G level oil well cements;
25 parts, light pearl;
78 parts, water;
The light bead footpath of this light-bead leakage-proof cement paste for well cementation is at 40 μ m; The density of mortar architecture is 1.5g/cm
3Thickening time is greater than 400min; The free-water volume ratio is 3%; Ultimate compression strength is that 24 hours ultimate compression strength is greater than 6MPa; Water-solid ratio is 0.75.
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| US7543642B2 (en) * | 2003-01-24 | 2009-06-09 | Halliburton Energy Services, Inc. | Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations |
| CN101962530A (en) * | 2010-10-15 | 2011-02-02 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Oil and gas field region well-prospecting and well-cementing cement secondary slurry process |
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| US6889767B2 (en) * | 2003-02-28 | 2005-05-10 | Halliburton E{umlaut over (n)}ergy Services, Inc. | Cementing compositions and methods of cementing in a subterranean formation using an additive for preventing the segregation of lightweight beads. |
| US20050241538A1 (en) * | 2004-04-28 | 2005-11-03 | Vargo Richard F Jr | Methods of making cement compositions using liquid additives containing lightweight beads |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7543642B2 (en) * | 2003-01-24 | 2009-06-09 | Halliburton Energy Services, Inc. | Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations |
| CN101962530A (en) * | 2010-10-15 | 2011-02-02 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Oil and gas field region well-prospecting and well-cementing cement secondary slurry process |
Non-Patent Citations (4)
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