CN116496065A - Low-density high-strength shale gas well cementation cement paste - Google Patents
Low-density high-strength shale gas well cementation cement paste Download PDFInfo
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- CN116496065A CN116496065A CN202310560643.0A CN202310560643A CN116496065A CN 116496065 A CN116496065 A CN 116496065A CN 202310560643 A CN202310560643 A CN 202310560643A CN 116496065 A CN116496065 A CN 116496065A
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- 239000004568 cement Substances 0.000 title claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000011343 solid material Substances 0.000 claims abstract description 12
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 10
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 10
- 239000010440 gypsum Substances 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 5
- 239000011219 quaternary composite Substances 0.000 claims abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000006703 hydration reaction Methods 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 230000036571 hydration Effects 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- 235000012241 calcium silicate Nutrition 0.000 claims description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 3
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 claims description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000003129 oil well Substances 0.000 claims description 3
- 229910021534 tricalcium silicate Inorganic materials 0.000 claims description 3
- 235000019976 tricalcium silicate Nutrition 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 239000011324 bead Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 12
- 238000007667 floating Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000004575 stone Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011049 pearl Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/141—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
- C04B14/18—Perlite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A low-density high-strength shale gas well cementation cement slurry. Belongs to the technical field of oilfield chemistry. Wherein the solid materials comprise the following components in parts by weight: 20-30 parts of cement, 2-3 parts of early strength agent and 0-5 parts of water reducer; the solid material also comprises the following quaternary composite additives in parts by weight: 5-15 parts of micro silicon, 25-35 parts of ceramic particles, 10-15 parts of pearl powder and 25-30 parts of slag; gypsum dihydrate 5; the solid material is formed according to the water cement ratio of 1-1.2, and the well cementation cement paste is obtained. The cement is 800-1000 mesh superfine cement. The invention is suitable for low-pressure easy-to-leak stratum, and solves the problems of insufficient cement return height, well cementation leakage and the like; the well cementation cost of the oil field is greatly reduced; can be directly mixed with water in proportion, has simple operation and reduces the on-site mixing procedure.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and relates to low-density high-strength shale gas well cementation cement paste, and a preparation method and application thereof.
Technical Field
The leakage of the circulating fluid is a common phenomenon in the drilling and well completion engineering in the petroleum and natural gas industry, and is a main factor affecting the safety and quality of the drilling and well cementation operation. In the well cementation operation, a low-density cement slurry system is generated to solve the problems of low-pressure easy-to-leak stratum, unbalanced stratum pressure and the like and reduce the oil gas circulation loss. Oil and gas companies have designed a variety of low density cements such as ceramic particulate cements, hollow glass microsphere cements, and foam cements. The hollow glass bead cement has stable physical performance, so that the hollow glass bead cement has wide application in well cementation operation and can prevent the leakage of circulating liquid.
At present, the low-density cement slurry system commonly used in domestic oil fields mainly comprises ceramic microparticle low-density cement slurry and floating bead low-density cement slurry. However, ceramic particles are limited by the characteristics of the particles and have great influence on the cement paste performance, and the density of the ceramic particles is difficult to prepare to be less than 1.50g/cm 3 Is added to the cement paste. The floating bead low-density cement paste can reduce the density to 1.l 0g/cm 3 However, as the floating beads are used as industrial byproducts of the power plant, the state continuously increases the natural ecological system and the environmental protection force along with the deepening of the environmental protection concept, the improvement of the flue emission facilities of the power plant is gradually carried out, the yield of the floating beads is gradually reduced, and finally the production of the byproducts of the floating beads is stopped. Although the technology for producing the high-performance artificial hollow glass floating beads abroad is mature, the well cementation cost is greatly increased due to the high price of the artificial hollow glass floating beads. In addition, the floating beads are easy to break under the condition of higher pressure or higher shearing rate, so that well cementation accidents are caused, and the requirements of partial oil and gas fields are difficult to meet.
The national intellectual property office has an authorized bulletin number of CN112723822B, which is named as a low-hydration heat low-density cement slurry system for well cementation and a preparation method and application thereof, and the low-hydration heat low-density cement slurry system comprises the following components in parts by weight: 60-70 parts of low-heat silicate cement; 30-40 parts of composite lightening material; 2-3 parts of a fluid loss agent; 0 to 0.15 portion of retarder; 0 to 1.5 portions of reinforcing agent; 70-85 parts of water. The prepared low-hydration heat low-density cement paste system has a wider temperature application range: 40-85 ℃, moderate density application range: 1.25-1.45g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Compared with a G-level cement low-density system under the same condition, the cement has longer thickening time (prolonged by 40-80 min) and higher 24/48h setting strength (improved by 15-30%). At the same time, the performance of the formula system is adjustedA reasonable unidirectional adjustment space is reserved, the contradiction and the difficult problem that the retarder and the reinforcing agent are used simultaneously in the existing system are solved, and the using amount of the additive is greatly reduced.
However, its low-heat Portland cement main mineral is C 2 S, the early hydration rate of which is often less than that of C 3 S1/10, the early hydration rate of cement is lower, and although the hydration heat release is reduced to a certain extent, the early strength development and performance exertion are not facilitated.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
The technical scheme of the invention is as follows: the low-density high-strength shale gas well cementation cement paste comprises the following solid materials in parts by weight:
20 to 30 percent of cement,
2 to 3 portions of early strength agent,
0-5% of water reducer;
the solid material also comprises the following quaternary composite additives in parts by weight: 5-15 parts of micro silicon, 25-35 parts of ceramic particles, 10-15 parts of pearl powder and 25-30 parts of slag;
gypsum dihydrate 5;
the solid material is formed according to the water cement ratio of 1-1.2, and the well cementation cement paste is obtained.
The cement is 800-1000 mesh superfine cement.
The superfine cement comprises the following mineral components in percentage by mass: 15% -35% of tricalcium silicate; 17% -45% of dicalcium silicate; 20% -24% of tricalcium aluminate; 15% -24% of tetracalcium aluminoferrite; 0.1-0.3% of calcium oxide, and the balance of mixed mineral impurities;
the density of the superfine cement is 3.18g/cm 3 The heat release rate 3d hydration heat is less than 210kJ/kg.
The density of the micro silicon is 2.80g/cm 3 SiO in micro silicon 2 The mass content is more than or equal to 85 percent.
The density of the ceramic particles is 2.44g/cm 3 。
The chemical components of the pearl powder comprise SiO 2 70～76%，Al 2 O 3 13～15% ，Fe 2 O 3 0.5-1%, caO 1-2%, mgO 0.5-1%, and the balance of mixed mineral impurities.
The early strength agent is G204 oil well cement early strength agent.
The water reducer is a polycarboxylic acid type water reducer.
Compared with the prior art, the invention has the following beneficial effects:
1. the low-density high-strength cement slurry system is suitable for low-pressure easily-lost stratum, and solves the problems of insufficient cement return height, well cementation leakage and the like;
2. the invention replaces floating beads with composite lightening materials (micro silicon, ceramic particles and pearl powder), thus greatly reducing the cementing cost of oil field;
3. the early strength agent used in the invention is a product which is publicly sold in the market by Wei Hui chemical industry limited company, is easy to obtain, and improves the economic benefit of small and medium-sized enterprises;
4. the cement of the invention can be directly mixed with water in proportion, the operation is simple, and the on-site mixing procedure is reduced.
Detailed Description
The invention provides a low-density high-strength shale gas well cementation cement slurry, which comprises the following solid materials in parts by weight:
20 to 30 percent of cement,
2 to 3 portions of early strength agent,
0-5% of water reducer;
the solid material also comprises the following quaternary composite additives in parts by weight: 5-15 parts of micro silicon, 25-35 parts of ceramic particles, 10-15 parts of pearl powder and 25-30 parts of slag;
gypsum dihydrate 5; the dihydrate gypsum is an alkali excitant, activates slag and improves strength.
The solid material is formed according to the water cement ratio of 1-1.2, and the well cementation cement paste is obtained.
The well cementation cement paste can reach the density of 1.25-1.35 g/cm 3 The non-floating bead incompressible low-density cement slurry system can reduce the well cementation cost and ensure the construction safety.
The micro silicon, slag and pearl powder in the invention act synergistically. According to a cement paste composition material particle stacking theoretical model, cementing materials (microsilicon, slag and pearl powder) with different particle sizes are selected for close stacking. On one hand, the cement paste is fully distributed in the gaps of the cement paste in the cement paste hydration process, so that a good filling effect is achieved; on the other hand, the compactness of the cement stone can be improved, and the early strength development of the cement stone is effectively promoted.
The cement is 800-1000 mesh superfine cement. The components have small particle size, can improve the filling property and compactness of the cement stone, has quick hydration reaction, and can improve the early strength of the cement stone.
The superfine cement comprises the following mineral components in percentage by mass: 15% -35% of tricalcium silicate; 17% -45% of dicalcium silicate; 20% -24% of tricalcium aluminate; 15% -24% of tetracalcium aluminoferrite; 0.1-0.3% of calcium oxide, and the balance of mixed mineral impurities;
the density of the superfine cement is 3.18g/cm 3 The heat release rate 3d hydration heat is less than 210kJ/kg.
The density of the micro silicon is 2.80g/cm 3 SiO in micro silicon 2 The mass content is more than or equal to 85 percent. The density is reduced, the water-cement ratio is reduced, free water is reduced, the content of solid phase particles in unit volume is improved, and the strength development of the cement stone is promoted. Meanwhile, the material is also a material for ensuring the stability of the slurry.
The density of the ceramic particles is 2.44g/cm 3 . In this way, while reducing the slurry density, the pozzolan is reactive in an alkaline environment, providing strength.
The chemical components of the pearl powder comprise SiO 2 70～76%，Al 2 O 3 13～15% ，Fe 2 O 3 0.5-1%, caO 1-2%, mgO 0.5-1%, and the balance of mixed mineral impurities. The density of the slurry is reduced, the water-cement ratio is reduced, free water is reduced, the bleeding phenomenon of cement slurry is prevented, and instability is avoided.
The early strength agent is G204 oil well cement early strength agent, is formed by mainly combining inorganic early strength materials, and is a product which is sold in the market by Wei Hui market chemical industry limited company, and the 24-hour strength is more than 6MPa.
The water reducer is SD105, and is a polycarboxylic acid type water reducer. The consistency of the cement paste is reduced, so that the cement is more easily and uniformly distributed in water, and the fluidity of the cement paste is improved.
The preparation method of the well cementation cement paste comprises the following steps: mixing the superfine cement, the micro-silicon, the slag, the ceramic particles, the pearl powder, the dihydrate gypsum, the early strength agent and the water reducing agent according to the weight parts, and then mixing according to the water-cement ratio of 1.00-1.20.
Because the superfine cement has small particle size, large specific surface area and large water demand for wetting the particle surface, the cement slurry has larger water demand and higher water cement ratio (weight percent of water in the cement slurry and cement) under the condition that the cement slurry reaches the same rheological property, and the porosity of the cement stone after the cement slurry is hardened is increased.
The invention will now be further described with reference to specific examples. It will be clear that the invention is not limited thereby to the described embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The low-density high-strength shale gas well cementation cement paste comprises the following components in parts by weight: 20 parts of superfine cement, 25 parts of slag, 10 parts of micro silicon, 25 parts of ceramic particles, 15 parts of pearl powder, 5 parts of dihydrate gypsum, 204 parts of G2 and 0.5 part of water reducing agent, and uniformly mixing the raw materials according to a water-cement ratio of 1:1 configuration. The physical properties of the cements of this example are shown in Table 1.
Example 2
The low-density high-strength shale gas well cementation cement paste comprises the following components in parts by weight: the preparation method comprises the steps of mixing 20 parts of superfine cement, 30 parts of slag, 15 parts of micro silicon, 35 parts of ceramic particles, 10 parts of pearl powder, 5 parts of dihydrate gypsum and 204 parts of G3 uniformly, and then mixing the raw materials according to a water-cement ratio of 1:1.2 configuration. The physical properties of the cements of this example are shown in Table 1.
Example 3
The low-density high-strength shale gas well cementation cement slurry comprises the following components in parts by weight: 30 parts of superfine cement, 25 parts of slag, 10 parts of micro silicon, 30 parts of ceramic particles, 10 parts of pearl powder, 5 parts of dihydrate gypsum, 204 parts of G2 and 0.5 part of water reducing agent, and uniformly mixing the raw materials according to a water-cement ratio of 1:1 configuration. The physical properties of the cements of this example are shown in Table 1.
Example 4
The low-density high-strength shale gas well cementation cement paste comprises the following components in parts by weight: the superfine cement 25, slag 30, micro silicon 15, ceramic particles 30, pearl powder 15, dihydrate gypsum 5 and G204 3 are uniformly mixed according to the water-cement ratio of 1:1.2 configuration. The physical properties of the cements of this example are shown in Table 1.
Table 1 physical and chemical Property index of examples
The low-density high-strength shale gas well cementation cement slurry system provided by the invention has the characteristics of low density, high strength, good rheological stability and the like, can meet the well cementation requirements of low-leakage pressure wells in different areas in China, has lower cost, and meets the oilfield requirements.
It should be noted that the above-described embodiments are only for explaining the present invention and do not constitute any limitation of the present invention. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (8)
1. The low-density high-strength shale gas well cementation cement paste comprises the following solid materials in parts by weight:
20 to 30 percent of cement,
2 to 3 portions of early strength agent,
0-5% of water reducer;
the solid material is characterized by further comprising quaternary composite additives in parts by weight: 5-15 parts of micro silicon, 25-35 parts of ceramic particles, 10-15 parts of pearl powder and 25-30 parts of slag;
gypsum dihydrate 5;
the solid material is formed according to the water cement ratio of 1-1.2, and the well cementation cement paste is obtained.
2. The low-density high-strength shale gas cementing slurry of claim 1, wherein said cement is 800-1000 mesh ultra-fine cement.
3. The low-density high-strength shale gas cementing slurry as claimed in claim 2, wherein the ultra-fine cement comprises the following mineral components in percentage by mass: 15% -35% of tricalcium silicate; 17% -45% of dicalcium silicate; 20% -24% of tricalcium aluminate; 15% -24% of tetracalcium aluminoferrite; 0.1-0.3% of calcium oxide, and the balance of mixed mineral impurities;
the density of the superfine cement is 3.18g/cm 3 The heat release rate 3d hydration heat is less than 210kJ/kg.
4. The low-density high-strength shale gas cementing slurry as claimed in claim 1, wherein said micro-silicon has a density of 2.80g/cm 3 SiO in micro silicon 2 The mass content is more than or equal to 85 percent.
5. The low-density high-strength shale gas cementing slurry of claim 1, wherein said ceramic particles have a density of 2.44g/cm 3 。
6. The low-density high-strength shale gas well cementation cement paste as claimed in claim 1, wherein the chemical components of the pearl powder comprise SiO 2 70～76%，Al 2 O 3 13～15% ，Fe 2 O 3 0.5-1%, caO 1-2%, mgO 0.5-1%, and the balance of mixed mineral impurities.
7. The low-density high-strength shale gas cementing slurry of claim 1, wherein the early strength agent is a G204 oil well cement early strength agent.
8. The low-density high-strength shale gas cementing slurry of claim 1, wherein the water reducer is a polycarboxylate water reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310560643.0A CN116496065B (en) | 2023-05-18 | 2023-05-18 | Low-density high-strength shale gas well cementation cement paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310560643.0A CN116496065B (en) | 2023-05-18 | 2023-05-18 | Low-density high-strength shale gas well cementation cement paste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116496065A true CN116496065A (en) | 2023-07-28 |
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