CN102382633A - Silicate grout for deep water - Google Patents
Silicate grout for deep water Download PDFInfo
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- CN102382633A CN102382633A CN2010102687636A CN201010268763A CN102382633A CN 102382633 A CN102382633 A CN 102382633A CN 2010102687636 A CN2010102687636 A CN 2010102687636A CN 201010268763 A CN201010268763 A CN 201010268763A CN 102382633 A CN102382633 A CN 102382633A
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Abstract
The invention discloses silicate grout for deep water, which consists of the following ingredients in parts by mass: 100 parts of cement, 2 to 40 parts of lightening agents, 3 to 7 parts of filtrate or reduction agents, 1 to 5 parts of dispersant, 10 to 50 parts of reinforcing agents, 0.1 to 1.5 parts of retarder and 50 to 100 parts of water. The silicate grout has excellent low-temperature early strength and low-temperature approximately right-angle thickening performance, the defects of slow gel strength development of the silicate grout at low temperature and low density and low early strength are overcome, and the surface casing and cementing operation can be ensured under the conditions of low temperature and low cracking pressure in deep water and complicated air flows in shallow water.
Description
Technical field
The present invention relates to a kind of silicate cement mud, be specifically related to a kind of deep water and use silicate cement mud.
Background technology
Deep water is meant the depth of water greater than 350 meters marine site, and the deep water surface string is the outermost sleeve pipe of deep water hydrocarbon casing program, and its major function has: isolate the top sea water layer, do not make seawater and top layer underground water infiltration pit shaft; The protection well head is reinforced the borehole wall of top layer, mud line below well section; Bore down to run into high-pressure oil-gas layer for continuing, preventer prevention blowout is installed on surface string; During the oil-gas mining, extracting device of oil etc. under water is installed.Ocean deepwater top layer pipe well cementing operation environment has low temperature, low stratum parting pressure and has gas hydrate and shallow streamlined outstanding feature.
The technical difficulty of deep water cementing is mainly reflected in: (1) is sea water advanced to be lower than 4 ℃ greater than temperature behind the 1000m, and the aquation solidifiability of conventional cementing cement is difficult to satisfy low temperature hydrated requirement; (2) seabed mud line sub-surface parting pressure is low, needs the variation of low-density grout coupling formation-parting pressure; (3) fluidic such as mud line sub-surface high pressure shallow-layer salt solution exists, and needs grout to have good right angle and solidifies characteristic, suppresses the generation of shallow-layer stream disaster.Exploitation low-temperature low-density high strength cement slurry forms low temperature shallow and flows efficient packing structure sleeve water mud, is key and the difficult point place that guarantees that the ocean deepwater exploratory development is effectively carried out.
Because when offshore oilfield carries out well cementing operation at present; All adopt the mode of blowing ash that cement is blown on the drilling unit from cement tanker; After having blown mixed cement,, not so will influence the performance of other interval isolation grout if want the defeated ash can of the necessary cleaning in other temperature section stratum of sealing; Serious possibly cause the accident, and the defeated ash can of cleaning will increase workload for well cementing operation.At present, the domestic report that does not also have simple G level silicate cement mud to be used for the well cementation of deep water surface string.
Summary of the invention
The purpose of this invention is to provide a kind of deep water and use silicate cement mud.
Grout provided by the invention is made up of cement, light-weight additive, water retaining, dispersion agent, toughener, retardant and water; The ratio of quality and the number of copies of said cement, light-weight additive, water retaining, dispersion agent toughener, retardant and water can be 100: (2-40): (3-7): (1-6): (10-50): (0.1-1.5): (50-100).
In the grout of the present invention, the ratio of quality and the number of copies of said cement, light-weight additive, water retaining, dispersion agent, toughener, retardant and water specifically can be 100: (2.5-34): (3-4): (1-4): (10-30): (0.1-1.0): (50-80), 100: 2.5: 3: 1: 10: 0.1: 50,100: 5: 4: 2: 15: 0.2: 60,100: 13: 5: 3: 20: 0.5: 70,100: 18: 5: 4: 25: 0.8: 80 or 100: 40: 7: 5: 50: 1.5: 100.
In the grout of the present invention, said cement can be silicate cement, like the good magnificent G class g cement of 1.20-1.80.
In the silicate cement mud of the present invention, said light-weight additive can be hollow glass micropearl; Said hollow glass micropearl can be the silicic-boric acid calcium salt; The density of said hollow glass micropearl is 0.44g/cm
3The residual motility rate of said glass microballon is more than 90% under 70MPa pressure, and is water insoluble and oily, has incompressibility, is low alkalinity, with most resene material compatibility arranged, and has to reduce viscosity and the function that improves liquidity.
In the silicate cement mud of the present invention, said water retaining can be high molecular weight water soluble polymer; Said high molecular weight water soluble polymer can be 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer or acrylic amide-acrylic sodium multipolymer; The number-average molecular weight of said 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer is 100000～1000000g/mol, and the number-average molecular weight of said acrylic amide-acrylic sodium multipolymer is 200000～2000000g/mol.
In the silicate cement mud of the present invention, said dispersion agent can be in modified lignin mahogany sulfonate and the following substances any mixture: any mixture in Lewatit, yellow soda ash, water glass, sodium aluminate and Sodium Tetraborate or acetonformaldehyde condenses and the following substances: Lewatit, yellow soda ash, water glass, sodium aluminate and Sodium Tetraborate.
In the silicate cement mud of the present invention, said modified lignin mahogany sulfonate can be calcium lignin sulphonate or sodium lignosulfonate; Said acetonformaldehyde condenses can be formaldehyde and 2: 1 polymerisate of acetone mol ratio.
In the silicate cement mud of the present invention, said toughener can be in mixture and the following substances of mixture or slag powders and cement of slag powders and cement any mixture: sodium sulfate, Repone K, SODIUMNITRATE, sodium metaaluminate, potassium silicate and quicklime; Said slag powders specifically can be following ultrafine slag powder: mass percent greater than the particle diameter of 90% slag powders less than 20 μ m; Said cement can be superfine cement, and said superfine cement specifically can be following G class g cement: mass percent greater than the particle diameter of 90% ultra-fine G class g cement less than 7 μ m.
In the silicate cement mud of the present invention, said retardant can be in soluble tartrate, sodium tartrate, boric acid and the organophosphate at least a.
In the silicate cement mud of the present invention, said water can be fresh water or seawater, and this seawater can be arbitrary deep sea water in South China Sea, the East Sea and the Bohai Sea.
Silicate cement mud of the present invention has the following advantages:
What 1) use is common G level silicate cement, has lower cost, and other source, component market is comparatively extensive, with low cost, has broad application prospects;
2) the used cement of grout is to use maximum a kind of cement with the scene well cementation at present sea, and the flexibility of grout and equipment is better, does not need special equipment, and cement operations is convenient;
3) on-the-spot well cementation is the same with the working method of common shallow well cementing slurry, convenient working personnel construction;
4) grout has the superior safety ability, and cement slurry thickening time is insensitive for temperature variation;
5) density of grout and thickening time controllable, good fluidity, WL is less, can satisfy the deep water cementing job requirements;
6) grout has excellent nearly " right angle multiviscosisty " performance, for anti-shallow-layer stream excellent effect is arranged;
7) early anti pressured intension that the time of coagulation under the low temperature is short and cement stone has excellence can effectively reduce the well cementation Hou Ning time (WOC), shortens construction cycle;
8) grout has lower hydration heat amount and can reduce gas hydrate effectively and decompose the influence to the oil gas well.
It is reliable to the invention provides a kind of technology, and site operation is simple and convenient, with low cost; Can satisfy low temperature, low stratum parting pressure, shallow-layer stream; Deepwater well cementing mortar under the gas hydrate condition is filled up the blank of domestic deep water surface string silicate cement mud.
Embodiment
Employed experimental technique is ordinary method like no specified otherwise among the following embodiment.
Used material, reagent etc. like no specified otherwise, all can obtain from commercial sources among the following embodiment.
The good magnificent G class g cement of the used 1.20-1.80 of the following embodiment of the present invention is silicate cement, buys the good magnificent cement mill in Sichuan; Ultrafine slag powder is bought the Jia Hua Science and Technology Ltd. in Jing Zhou; Ultra-fine G class g cement is bought in the cement mill, Ge Zhou Ba; Hollow silicic-boric acid calcium microballon is bought in Minnesota Mining and Manufacturing Company.
The specification of the used ultrafine slag powder of the following embodiment of the present invention is: mass percent greater than the particle diameter of 90% slag powders less than 20 μ m; The specification of ultra-fine G class g cement is: mass percent greater than the particle diameter of 90% G class g cement less than 7 μ m.
The preparation of embodiment 1, silicate cement mud
Prescription is: the mixture 25Kg of 1.20 good magnificent G class g cement 100Kg, South China Sea deep-sea water 100Kg, ultrafine slag powder and ultra-fine G class g cement (wherein; The ratio of quality and the number of copies of ultrafine slag powder and ultra-fine G class g cement is 2: 3), (number-average molecular weight is 5000g/mol for soluble tartrate 0.1Kg, calcium lignin sulphonate (Jing Zhou Jia Hua Science and Technology Ltd.) and Lewatit; Jing Zhou Jia Hua Science and Technology Ltd.) mixture 3Kg (wherein, the ratio of quality and the number of copies of calcium lignin sulphonate and Lewatit is 2: 1), (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 34Kg, 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer (number-average molecular weight is 100000g/mol) 5Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
The preparation of embodiment 2, silicate cement mud
Prescription is: the mixture 20Kg of 1.40 good magnificent G class g cement 100Kg, deep-sea, Chinese Bohai Sea water 70Kg, ultrafine slag powder, ultra-fine G class g cement and sodium sulfate (wherein; The ratio of quality and the number of copies of ultrafine slag powder, ultra-fine G class g cement and sodium sulfate is 2: 3: 1), the mixture 2Kg (wherein, the ratio of quality and the number of copies of calcium lignin sulphonate and yellow soda ash is 1: 1) of calcium lignin sulphonate (Jing Zhou Jia Hua Science and Technology Ltd.) and yellow soda ash, (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 18Kg, acrylic amide-acrylic sodium multipolymer (number-average molecular weight is 2000000g/mol) 4Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
The preparation of embodiment 3, silicate cement mud
Prescription is: the mixture 10Kg of 1.50 good magnificent G class g cement 100Kg, fresh water 60Kg, ultrafine slag powder, ultra-fine G class g cement and Repone K (wherein; The ratio of quality and the number of copies of ultrafine slag powder, ultra-fine G class g cement and Repone K is 2: 3: 1), the mixture 1Kg (wherein, the ratio of quality and the number of copies of calcium lignin sulphonate and water glass is 1: 1) of calcium lignin sulphonate (Jing Zhou Jia Hua Science and Technology Ltd.) and water glass, (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 13Kg, acrylic amide-acrylic sodium multipolymer (number-average molecular weight 200000g/mol) 3Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
The preparation of embodiment 4, silicate cement mud
Prescription is: the mixture 30Kg of 1.60 good magnificent G class g cement 100Kg, fresh water 50Kg, ultrafine slag powder, ultra-fine G class g cement and SODIUMNITRATE (wherein; The ratio of quality and the number of copies of ultrafine slag powder, ultra-fine G class g cement and SODIUMNITRATE is 2: 3: 1), the mixture 4Kg of HEDP sodium (Jing Zhou Jia Hua Science and Technology Ltd.) 0.8Kg, sodium lignosulfonate (Jing Zhou Jia Hua Science and Technology Ltd.) and water glass (wherein; The ratio of quality and the number of copies of sodium lignosulfonate and water glass is 1: 1), (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 9Kg, 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer (number-average molecular weight 1000000g/mol) 6Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
The preparation of embodiment 5, silicate cement mud
Prescription is: the mixture 50Kg of 1.70 good magnificent G class g cement 100Kg, Chinese Bohai Sea deep sea water 80Kg, ultrafine slag powder, ultra-fine G class g cement and sodium metaaluminate (wherein; The ratio of quality and the number of copies of ultrafine slag powder, ultra-fine G class g cement and sodium metaaluminate is 2: 3: 1.2); The compound 3Kg (wherein, the ratio of quality and the number of copies of sodium lignosulfonate and sodium aluminate is 1: 1) of HEDP sodium 1.0Kg, sodium lignosulfonate (Jing Zhou Jia Hua Science and Technology Ltd.) and sodium aluminate, (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 5Kg, 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer (number-average molecular weight 500000g/mol) 5Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
The preparation of embodiment 6, silicate cement mud
Prescription is: mixture 15Kg (wherein, the ratio of quality and the number of copies of ultrafine slag powder, ultra-fine G class g cement and Sodium Tetraborate is 2: 2: 1.2), soluble tartrate 0.1Kg, acetonformaldehyde condenses (formaldehyde and 2: 1 polymerisate of the acetone mol ratio) 3Kg of 1.80 good magnificent G class g cement 100Kg, South China Sea deep sea water 50Kg, ultrafine slag powder, ultra-fine G class g cement and Sodium Tetraborate, (its density is 0.44g/cm to hollow silicic-boric acid calcium microballon
3) 2.5Kg, acrylic amide-acrylic sodium multipolymer (number-average molecular weight 1000000g/mol) 5Kg.
The component of said ratio mixed obtain silicate cement mud, according to deep water cementing touchstone API10B-3-2004 standard it is carried out performance test, The performance test results is as shown in table 1.
Table 1 surface casing cementing embodiment 1-6 silicate cement mud The performance test results
The mensuration of " 15 ℃ of temperature change value that adiabatic environment grout aquation produces " is carried out in 15 ℃ of airtight adiabatic isoperibols in the table 1.
Can know by data shown in the table 1:
(1) deep water of the present invention has stability and multiviscosisty controllability preferably with silicate cement mud, is convenient to working design, helps practicing thrift the wellsite operation time;
(2) deep water of the present invention has good low temperature early strength and low filtration loss with silicate cement mud, can fully satisfy deep water surface casing cementing job requirements.
Claims (9)
1. a grout is made up of cement, light-weight additive, water retaining, dispersion agent, toughener, retardant and water; The ratio of quality and the number of copies of said cement, light-weight additive, water retaining, dispersion agent toughener, retardant and water is 100: (2-40): (3-7): (1-5): (10-50): (0.1-1.5): (50-100).
2. grout according to claim 1 is characterized in that: said cement is silicate cement.
3. grout according to claim 1 and 2 is characterized in that: said light-weight additive is a hollow glass micropearl; Said hollow glass micropearl is the silicic-boric acid calcium salt; The density of said hollow glass micropearl is 0.44g/cm
3
4. according to arbitrary described grout among the claim 1-3, it is characterized in that: said water retaining is a high molecular weight water soluble polymer; Said high molecular weight water soluble polymer is 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer or acrylic amide-acrylic sodium multipolymer; The number-average molecular weight of said 2-acrylic amide-2-methyl propane sulfonic acid-acrylamide copolymer is 100000g/mol～1000000g/mol, and the number-average molecular weight of said acrylic amide-acrylic sodium multipolymer is 200000g/mol～2000000g/mol.
5. according to the described grout of claim 1-4, it is characterized in that: said dispersion agent is any mixture in modified lignin mahogany sulfonate and the following substances: any mixture in Lewatit, yellow soda ash, water glass, sodium aluminate and Sodium Tetraborate or acetonformaldehyde condenses and the following substances: Lewatit, yellow soda ash, water glass, sodium aluminate and Sodium Tetraborate.
6. grout according to claim 5 is characterized in that: said modified lignin mahogany sulfonate is calcium lignin sulphonate or sodium lignosulfonate; Said acetonformaldehyde condenses is formaldehyde and 2: 1 polymerisate of acetone mol ratio.
7. according to arbitrary described grout among the claim 1-6, it is characterized in that: said toughener is any mixture in mixture and the following substances of mixture or slag powders and cement of slag powders and cement: sodium sulfate, Repone K, SODIUMNITRATE, sodium metaaluminate, potassium silicate and quicklime.
8. according to arbitrary described grout among the claim 1-7, it is characterized in that: said retardant is at least a in soluble tartrate, sodium tartrate, boric acid and the organophosphate.
9. according to arbitrary described grout among the claim 1-8, it is characterized in that: said water is fresh water or seawater.
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