CN107129796B - Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof - Google Patents
Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof Download PDFInfo
- Publication number
- CN107129796B CN107129796B CN201610107763.5A CN201610107763A CN107129796B CN 107129796 B CN107129796 B CN 107129796B CN 201610107763 A CN201610107763 A CN 201610107763A CN 107129796 B CN107129796 B CN 107129796B
- Authority
- CN
- China
- Prior art keywords
- channeling
- nano
- cement
- agent
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C09K8/493—Additives for reducing or preventing gas migration
-
- 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
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a composite anti-channeling agent for well cementation cement slurry, which is characterized by comprising nano-silica anti-channeling emulsion and well cementation latex, and is characterized in that the particle size of nano-silica particles in the nano-silica anti-channeling emulsion is distributed in the range of 9nm and 310nm, and the average particle size is in the range of 80nm to 120 nm. The invention also relates to cement paste and a preparation method thereof.
Description
Technical Field
The invention relates to a channeling-preventing agent, in particular to a channeling-preventing agent for oil-gas well engineering. The invention also relates to cement paste and a preparation method thereof.
Background
At present, most of the gas channeling prevention well cementation cement slurry is added with latex to improve the channeling prevention performance of the cement slurry. Under the condition of ultrahigh temperature, the temperature far exceeds the glass transition temperature of latex, the physical properties of a film formed by the latex on two interfaces are poor, gas channeling cannot be effectively inhibited when cement slurry is subjected to 'weight loss', and the well cementation quality of a latex cement slurry system is not ideal. The statistical results of the field well cementation construction also show that when the temperature is higher than 130 ℃, the well cementation quality of the system applying the latex cement paste is obviously reduced, and the channeling prevention difficulty is increased. Therefore, there is a need in the art for a better performing anti-channeling agent, especially one that performs better under complex conditions such as ultra-high temperatures.
Disclosure of Invention
In order to solve the problems in the prior art, the inventor of the present invention unexpectedly finds out through a large number of experiments that a brand new composite anti-channeling agent for well cementing cement slurry can effectively prevent channeling.
An object of the present invention is to provide a composite anti-channeling agent for well cementing cement slurry, which comprises nano-silica anti-channeling emulsion in which nano-silica particles have a particle size distribution in the range of 9nm to 310nm and an average particle size in the range of 80nm to 120nm, and a well cementing latex.
The composite anti-channeling agent can effectively improve the well cementation quality of a gas well under the ultra-high temperature condition, and is characterized in that nanoscale hard ball nano silica particles and deformable soft ball latex particles can be filled among cement particles, so that the anti-channeling capacity of cement paste under the ultra-high temperature condition is improved. The gaps among cement particles are in micron level, the particle size distribution range of particles in the nano-silica anti-channeling emulsion is between 9nm and 310nm, the average particle size is only 80-120nm, the nano-silica anti-channeling emulsion can be tightly filled among the cement particles to reduce the diameter of the gaps, and then the latex particles are deformed into a film to block the fine gaps, namely, the nano-silica particles are filled to provide more stress supporting points for the latex film, so that the latex film is prevented from being damaged, the damage of the cement paste 'weightlessness' latex film can be effectively inhibited or slowed down, and the anti-channeling purpose is achieved.
In a preferred embodiment of the present invention, the nano-silica anti-channeling emulsion is composed of nano-silica having different particle diameters (10nm, 100nm, 200nm, 300nm), water, a dispersant, a surface coating agent, a stabilizer, a pH adjuster, and the content of the nano-silica having the different particle diameters is adjusted so that the particle diameters of nano-silica particles in the nano-silica anti-channeling emulsion are distributed in the range of 9nm to 310nm, and the average particle diameter is in the range of 80nm to 120 nm; preferably, the content of the nano-silica having different particle diameters is adjusted so that the particle diameter distribution of the nano-silica particles in the nano-silica anti-channeling emulsion is in the range of 9nm to 210nm and the average particle diameter is in the range of 95nm to 105 nm. In a preferred embodiment of the present invention, in the nano silica anti-channeling emulsion:
(1) the effective content of nanosilica is 40-50 wt%, preferably 44-46 wt%;
(2) the weight ratio of the dispersing agent, the surface coating agent, the stabilizing agent and the nano silicon dioxide in the nano silicon dioxide anti-channeling emulsion is as follows:
dispersing agent: 0.1-5% of nano silicon dioxide
Surface coating agent: 0.1-8% of nano silicon dioxide
A stabilizer: 0.1-5% of nano silicon dioxide;
(3) the addition amount of the pH regulator can enable the pH value of the primary pure water to reach 4-6;
(4) the viscosity of the product was <0.10Pa · s.
In a preferred embodiment of the invention, the dispersant is a polymeric dispersant, typically a polyacrylate dispersant (gillin chemical).
In a preferred embodiment of the present invention, the surface coating agent is one or more of polyoxyethylene glycol with a molecular weight of 200, 400, 1000, 1500, 2000, 4000, 6000, 10000, 20000.
In a preferred embodiment of the invention, the stabilizer is preferably carbamide.
In a preferred embodiment of the present invention, the pH adjuster is an acidic substance, preferably one or more of hydrochloric acid, sulfuric acid, citric acid, and nitric acid.
In a preferred embodiment of the present invention, the nano silica anti-channeling emulsion is prepared as follows:
a, adding a pH regulator into distilled water to regulate the pH value of the water to be between 4 and 6.
b, adding a dispersing agent into the aqueous solution a;
c, fully mixing and dispersing the aqueous solution b and the nano silicon dioxide in a dispersion mixer;
d, adding a surface coating agent into the mixture c, and uniformly stirring;
e stabilizer in mixture d and stirring homogeneously.
In a preferred embodiment of the invention, the nano-silica anti-channeling emulsion is used by directly adding the nano-silica anti-channeling emulsion and other additives (such as fluid loss additive, dispersant, retarder and the like) of the oil-well cement into the slurry preparation water of the oil-well cement. The addition amount of the nano silicon dioxide anti-channeling emulsion is 10 percent.
The nano silicon dioxide anti-channeling emulsion is characterized in that the average particle size is adjustable, the highest storage temperature can reach 70 ℃, and the validity period can reach more than one year.
In a preferred embodiment of the present invention, the particle size distribution of the nano-silica particles in the nano-silica channeling-preventing emulsion may be, for example, in the range of 9nm to 310nm, in the range of 9nm to 300nm, in the range of 9nm to 250nm, in the range of 9nm to 200nm, in the range of 9nm to 150nm, in the range of 9nm to 100nm, in the range of 9nm to 500nm, in the range of 10nm to 300nm, in the range of 10nm to 250nm, in the range of 10nm to 200nm, in the range of 10nm to 150nm, in the range of 10nm to 100nm, in the range of 10nm to 500nm, in the range of 20nm to 300nm, in the range of 20nm to 200nm, in the range of 20nm to 100nm, in the range of 50nm to 300nm, in the range of 50nm to 200nm, in the range of 50nm to 100nm, in the range of 100nm to 300nm, in the range of 100nm to 200nm, In the range of 100nm to 150nm, in the range of 150nm to 300nm, in the range of 150nm to 200nm, in the range of 200nm to 300nm, or in the range of 200nm to 250 nm.
In a preferred embodiment of the present invention, the average particle diameter of the nano silica particles in the nano silica channeling-preventing emulsion may be, for example, in the range of 80nm to 120nm, in the range of 80nm to 110nm, in the range of 80nm to 100nm, in the range of 80nm to 90nm, in the range of 80nm to 85nm, in the range of 90nm to 120nm, in the range of 90nm to 110nm, in the range of 90nm to 100nm, in the range of 90nm to 95nm, in the range of 100nm to 120nm, in the range of 100nm to 110nm, in the range of 100nm to 105nm, in the range of 110nm to 120nm, in the range of 115nm to 120nm, or in the range of 98nm to 102 nm.
In a preferred embodiment of the present invention, the nano silica particles in the nano silica anti-channeling emulsion have a particle size distribution in the range of 9nm to 210nm and an average particle size in the range of 95nm to 105 nm.
In a preferred embodiment of the present invention, the nano silica anti-channeling emulsion and the well cementing latex are in a mass ratio of (4-7): (2.5-7).
In a preferred embodiment of the present invention, the nanosilica anti-channeling emulsion has an effective solids content of 40-50 wt%, preferably 44-46 wt%.
In a preferred embodiment of the present invention, the nano silica particles in the nano silica anti-channeling emulsion are spherical particles. In a preferred embodiment of the present invention, the surface of the nano silica particles has high activity and can participate in the hydration reaction of cement.
In a preferred embodiment of the present invention, the well cementing latex is styrene-butadiene latex and/or styrene-acrylic latex.
Another object of the present invention is to provide a channeling-preventing cement slurry for well cementation, which is characterized in that the cement slurry comprises the above composite channeling-preventing agent.
In a preferred embodiment of the invention, the cement slurry comprises the following:
oil well cement, preferably grade G oil well cement,
according to the above-mentioned composite channeling-preventing agent,
the silicon powder is mixed with the silicon powder,
the water loss reducing agent is a water loss reducing agent,
a retarder which is formed by mixing a water-soluble polymer,
a dispersant which is a mixture of a dispersant and a surfactant,
a defoaming agent, and
and (3) water.
In a preferred embodiment of the invention, the cement slurry consists of:
oil well cement, preferably grade G oil well cement,
according to the above-mentioned composite channeling-preventing agent,
the silicon powder is mixed with the silicon powder,
the water loss reducing agent is a water loss reducing agent,
a retarder which is formed by mixing a water-soluble polymer,
a dispersant which is a mixture of a dispersant and a surfactant,
a defoaming agent, and
and (3) water.
In a preferred embodiment of the invention, the cement slurry comprises the following:
45-56 parts by mass of oil well cement, preferably G-grade oil well cement,
6.5 to 14 parts by mass of the composite anti-channeling agent according to any one of claims 1 to 5,
15-20 parts by mass of silicon powder, preferably silica accounts for more than 96 parts by mass of the silicon powder, the particle size of the silicon powder is 80-200 meshes,
1-2.5 parts by mass of fluid loss agent,
0.1 to 0.5 mass part of retarder,
0.2 to 1 part by mass of a dispersant,
0.2 to 1 part by mass of an antifoaming agent, and
14.5 to 16 parts by mass of water.
In a preferred embodiment of the invention, the cement slurry consists of:
45-56 parts by mass of oil well cement, preferably G-grade oil well cement,
6.5 to 14 parts by mass of the composite anti-channeling agent according to any one of claims 1 to 5,
15-20 parts by mass of silicon powder, preferably silica accounts for more than 96 parts by mass of the silicon powder, the particle size of the silicon powder is 80-200 meshes,
1-2.5 parts by mass of fluid loss agent,
0.1 to 0.5 mass part of retarder,
0.2 to 1 part by mass of a dispersant,
0.2 to 1 part by mass of an antifoaming agent, and
14.5 to 16 parts by mass of water.
In a preferred embodiment of the invention, the cement slurry has a density of 1.85 to 1.95g/cm3In the range of (1), the cement paste has an API water loss of less than 50mL, the static gel strength transition time of the cement paste is less than 10min, and the anti-channeling factor SPN value is less than 2.
In a preferred embodiment of the present invention, the fluid loss additive is an AMPS-based copolymer.
In a preferred embodiment of the invention, the dispersant is a ketone aldehyde condensate.
In a preferred embodiment of the present invention, the retarder is an organic acid.
In a preferred embodiment of the invention, the anti-foaming agent is a silicone oil.
Still another object of the present invention is to provide a method for preparing the above cement slurry, comprising the steps of:
1) respectively putting 14.5-16 parts by mass of water, 4-7 parts by mass of nano-silica anti-channeling emulsion, 2.5-7 parts by mass of latex for well cementation, 1-2.5 parts by mass of fluid loss additive, 0.1-0.5 part by mass of retarder, 0.2-1 part by mass of dispersant and 0.2-1 part by mass of defoaming agent into a storage tank, and pumping and circulating for at least two hours to obtain stock solution for later use, wherein the particle size distribution of nano-silica particles in the nano-silica anti-channeling emulsion is in the range of 9nm and 310nm, and the average particle size is in the range of 80nm to 120 nm;
2) dry-mixing 45-56 parts by mass of oil well cement, preferably G-grade oil well cement and 15-20 parts by mass of silicon powder by using dry mixing equipment to obtain mixed ash for later use;
3) mixing the feed liquid prepared in the step 1) and the mixed ash prepared in the step 2) according to the ratio of (0.35-0.5): 1, preparing cement slurry by using well cementation equipment.
In a preferred embodiment of the invention, said steps 1) -3) may be performed in any logically feasible order, for example step 1) may precede step 2), or steps 1) and 2) may be performed simultaneously.
In a preferred embodiment of the present invention, the fluid loss additive is an AMPS-based copolymer.
In a preferred embodiment of the invention, the dispersant is a ketone aldehyde condensate.
In a preferred embodiment of the present invention, the retarder is an organic acid.
In a preferred embodiment of the invention, the anti-foaming agent is a silicone oil.
In a preferred embodiment of the invention, the water is tap water.
In the present invention, unless otherwise specifically indicated, the proportions herein are mass ratios and the percentages are mass percentages.
The invention has the beneficial effects that: the density range of the cement paste prepared by the invention is 1.85-1.95g/cm3Meanwhile, the API water loss is less than 50mL, the thickening time is good in adjustability, cement paste is easy to prepare, the static gel strength transition time is less than 10min, the anti-channeling factor SPN value is less than 2, particularly less than 0.6, the anti-channeling effect can be effectively achieved, the cement paste can be used for cementing under the ultra-high temperature condition, the highest temperature can reach 200 ℃, and the cementing quality under the ultra-high temperature condition is improved.
Detailed Description
The invention is further illustrated by the following non-limiting examples, but the scope of the invention is not limited to the examples.
The fluid loss additive, retarder, dispersant, defoamer, sand powder, nano-silica anti-channeling emulsion and latex used in the examples are all conventional commercial products in the field.
Example 1
Adding hydrochloric acid into 250Kg of distilled water to make the pH value of the solution 5.0, adding 12Kg of sodium polyacrylate, adding 145Kg of silicon dioxide with the average particle size of 10nm, 40Kg of silicon dioxide with the average particle size of 100nm, 40Kg of silicon dioxide with the average particle size of 200nm and 25Kg of silicon dioxide with the average particle size of 300nm, stirring and dispersing for 2 hours in a stirring and dispersing machine at the rotating speed of 1400r/min, adding 5Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 200, 10Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 400 and 5Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 1000, stirring and dispersing for 10 minutes at the rotating speed of 1400r/min, adding 2Kg of carbamide, stirring and dispersing machine at the rotating speed of 1400r/min for 5 minutes to prepare the anti-channeling-proof emulsion of nano silicon dioxide with the solid content of 45% (wt%) and the particle size distribution of 9-310nm, the average particle size was 80 nm. The density of the nano silicon dioxide anti-channeling emulsion is 1.37g/cm3, the average particle size is 80nm, and the viscosity is 0.058 Pa.s. The silica dispersion did not precipitate and remained fluid within one year of gravity settling at room temperature. The nanometer silicon dioxide anti-channeling emulsion is not precipitated and still has fluidity after being settled by gravity for 6 months at 70 ℃.
The density is 1.85g/cm3The preparation method of the nano-silica emulsion and latex composite anti-channeling cement slurry (calculated by 10 cubic cement slurry) comprises the following steps:
1) 2.71 tons of tap water, 0.04 ton of defoaming agent, 1.35 tons of nano-silica anti-channeling emulsion, 1.35 tons of latex for well cementation, 0.18 ton of water loss reducer for oil well cement slurry, 0.03 ton of retarder for oil well cement and 0.09 tons of dispersant for oil well cement are respectively put into a storage tank and pumped for circulating for at least two hours to form stock solution for standby application, wherein the particle size distribution of nano-silica particles in the nano-silica anti-channeling emulsion is between 9nm and 310nm, and the average particle size is between 80nm and 120 nm;
2) dry-mixing 9 tons of G-grade oil well cement and 3.6 tons of silicon powder by using dry mixing equipment to obtain mixed ash, and storing the mixed ash in a cement ash tank for later use;
3) mixing the feed liquid prepared in the step 1) and the mixed ash prepared in the step 2) according to a ratio of 0.47: 1, the mass ratio of the cement paste is prepared into the density of 1.85g/cm by using well cementation equipment3The cement paste is prepared.
The prepared cement paste has strong thixotropy, and loses fluidity after the cement paste is kept still for 5min under the conditions of normal temperature and normal pressure. Thickening time of the cement paste is 156min, API dehydration is 12mL, static gelation transition time is 4min, the cement paste anti-channeling factor SPN value is 0.33, and the cement paste permeability is 0.003 x 10 under the conditions of 145 ℃ and 102Mpa for 60min-3μm2And a strength of 26MPa for 24 hours.
Example 2
Adding hydrochloric acid into 260Kg of distilled water to make the pH value of the solution be 4.0, adding 8Kg of sodium polyacrylate, 80Kg of nano-silica with average particle size of 10nm, 100Kg of silica with average particle size of 100nm and 70Kg of nano-silica with average particle size of 200nm, stirring and dispersing for 2 hours in a stirring disperser at the rotating speed of 1400r/min, adding 5Kg of glycol polyoxyethylene ether with the molecular weight of 200, 5Kg of glycol polyoxyethylene ether with the molecular weight of 2000 and 1Kg of glycol polyoxyethylene ether with the molecular weight of 4000, stirring for 10 minutes in the stirring disperser at the rotating speed of 1400r/min, 6Kg of carbamide is added, and the mixture is stirred for 5min by a stirring disperser at the rotating speed of 1400r/min, thus obtaining the nano silicon dioxide anti-channeling emulsion with the effective solid content of 45 percent (wt percent), the average grain diameter of 100nm and the viscosity of 0.053 Pa.s. The density of the nano silicon dioxide anti-channeling emulsion is 1.38g/cm3The particle size distribution is 9-210nm, and the average particle size is 100 nm. After the nano silicon dioxide anti-channeling emulsion is settled by gravity at room temperature for one year, the nano silicon dioxide anti-channeling emulsion still has fluidity. The nanometer silicon dioxide anti-channeling emulsion is not precipitated and still has fluidity after being settled by gravity for 6 months at 70 ℃.
7in tail pipe cementing of 5-2 wells in the south of Xinjiang, wherein the bottom temperature of the well reaches 183 ℃, and the density of the designed cement slurry is 1.91g/cm3. The well construction accounts for 25 cubic cement slurry in the well, the well cementation quality is excellent, and the problem of serious after-effect after 7in liner cementing and plug sweeping in the area is successfully solved.
The density of the well is 1.91g/cm3The preparation method of the nano-silica emulsion and latex composite anti-channeling cement slurry (calculated by 10 cubic cement slurry) comprises the following steps:
1) 3.04 tons of tap water, 0.1 ton of defoaming agent, 1.03 tons of nano-silica anti-channeling emulsion, 1.03 tons of latex for well cementation, 0.31 ton of water loss reducer for oil well cement slurry, 0.05 ton of retarder for oil well cement and 0.05 ton of dispersant for oil well cement are respectively put into a storage tank and pumped for circulating for at least two hours to form stock solution for standby application, wherein the particle size distribution of nano-silica particles in the nano-silica anti-channeling emulsion is between 9nm and 310nm, and the average particle size is between 80nm and 120 nm;
2) dry-mixing 10.2 tons of G-grade oil well cement and 3.6 tons of silicon powder by using dry mixing equipment to obtain mixed ash, and storing the mixed ash in a cement ash tank for later use;
3) mixing the feed liquid prepared in the step 1) and the mixed ash prepared in the step 2) according to a ratio of 0.43: 1, the mass ratio of the cement paste is prepared into the density of 1.90g/cm by using well cementation equipment3The cement paste is prepared.
The prepared cement paste has strong thixotropy, and loses fluidity after the cement paste is kept still for 7min under the conditions of normal temperature and normal pressure. Under the conditions of 145 ℃ and 102Mpa for 60min, the thickening time of the cement paste is 166min, the API loses 18mL, the static gelling transition time is 4min, the cement paste anti-channeling factor SPN value is 0.47, and the cement paste permeability is 0.006 to 10-3μm2And a strength of 25.5MPa for 24 hours.
Example 3
Adding hydrochloric acid into 265Kg of distilled water to make the pH value of the solution 6.0, adding 2Kg of sodium polyacrylate, 25Kg of nano-silica with the average particle size of 10nm, 100Kg of silica with the average particle size of 100nm, 100Kg of nano-silica with the average particle size of 200nm and 25Kg of nano-silica with the average particle size of 300nm, stirring and dispersing for 2 hours in a stirring and dispersing machine at the rotating speed of 1400r/min, adding 1Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 400, 2Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 6000 and 2Kg of ethylene glycol polyoxyethylene ether with the molecular weight of 20000, stirring and dispersing for 10 minutes in the stirring and dispersing machine at the rotating speed of 1400r/min, adding 12Kg of carbamide, stirring and dispersing machine at the rotating speed of 1400r/min to prepare the nano-silica anti-channeling emulsion with the effective solid content of 45% (wt%), the particle size distribution is 9-310nm, the average particle size is 150nm, and the viscosity is 0.041 Pa.s. The density of the nano silicon dioxide anti-channeling emulsion is 1.38g/cm3Average particle size 150 nm. After the nano silicon dioxide anti-channeling emulsion is settled by gravity at room temperature for one year, the nano silicon dioxide anti-channeling emulsion still has fluidity. The nanometer silicon dioxide anti-channeling emulsion is not precipitated and still has fluidity after being settled by gravity for 6 months at 70 ℃.
The density was 1.95g/cm3The preparation method of the nano-silica anti-channeling emulsion cement slurry (calculated by 10 cubic cement slurry) comprises the following steps:
1) 3.1 tons of tap water, 0.16 tons of defoaming agent, 0.87 tons of nano-silica anti-channeling emulsion, 0.54 tons of latex for well cementation, 0.43 tons of oil well cement slurry fluid loss agent, 0.09 tons of oil well cement retarder and 0.16 tons of oil well cement dispersant are respectively put into a storage tank and pumped for circulating for at least two hours to form stock solution for standby use, wherein the particle size distribution of nano-silica particles in the nano-silica anti-channeling emulsion is between 9nm and 310nm, and the average particle size is between 80nm and 120 nm;
2) dry-mixing 10.9 tons of G-grade oil well cement and 3.3 tons of silicon powder by using dry mixing equipment to obtain mixed ash, and storing the mixed ash in a cement ash tank for later use;
3) mixing the feed liquid prepared in the step 1) and the mixed ash prepared in the step 2) according to a ratio of 0.38: 1, the mass ratio of the cement paste is prepared into the density of 1.95g/cm by using well cementation equipment3The cement paste is prepared.
The prepared cement paste has stronger thixotropy, and loses fluidity after the cement paste is kept still for 10min under the conditions of normal temperature and normal pressure. Under the conditions of 145 ℃ and 102Mpa for 60min, the thickening time is 159min, the API loses 21mL, the static gelling transition time is 4min, the cement slurry anti-channeling factor SPN value is 0.53, and the cement stone permeability is 0.01 and 10-3μm2And a strength of 27MPa for 24 hours.
Through detection, the anti-channeling cement slurry prepared in the embodiment 1-3 can meet the density range of 1.85-1.95g/cm3The cementing construction of the cement has the design requirement, the water loss of API is less than 50mL, the thickening time is good in adjustability, the cement slurry is easy to prepare, the static gel strength transition time is less than 10min, the channeling-preventing factor SPN value is less than 2, and the channeling-preventing effect is good.
Comparative example 1
The other conditions were the same as in example 1 except that the anti-channeling agent used was not a composite anti-channeling agent comprising a nano-silica anti-channeling emulsion and a well-cementing latex, but a single anti-channeling agent comprising only a nano-silica anti-channeling emulsion and no well-cementing latex.
The detection shows that the prepared cement paste has stronger thixotropy, and loses fluidity after the cement paste is kept still for 5min under the conditions of normal temperature and normal pressure. Thickening time of cement paste at 145 ℃ and 102Mpa for 60min, API dehydration of 17mL, static gelation transition time of 6min, cement paste anti-channeling factor SPN value of 0.93, and cement stone permeability of 0.05 and 10-3μm2And a strength of 25MPa for 24 hours.
Comparative example 2
The other conditions were the same as in example 1 except that the anti-channeling agent used was not a composite anti-channeling agent comprising a nano-silica anti-channeling emulsion and a well-cementing latex, but was a single anti-channeling agent comprising only a well-cementing latex and not a nano-silica anti-channeling emulsion.
Through detection, the prepared cement paste has weak thixotropy, and still has fluidity after standing for 20min under the conditions of normal temperature and normal pressure. Thickening time of the cement paste is 189min, API dehydration is 26mL, static gelation transition time is 7min, the cement paste anti-channeling factor SPN value is 0.89, and the cement paste permeability is 0.06 x 10 under the conditions of 145 ℃ 102Mpa 60min-3μm2And a strength of 23MPa for 24 hours.
Comparative example 3
The other conditions were the same as in example 1 except that the composite channeling-preventing agent was used in which the particle size of the nano-silica particles in the nano-silica channeling-preventing emulsion was too small (the particle size distribution was in the range of 5nm to 8nm, and the average particle size was less than 7 nm).
It can not be prepared into cement paste by this method.
Comparative example 4
The other conditions were the same as in example 1 except that the composite channeling-preventing agent was used in which the particle size of the nano-silica particles in the nano-silica channeling-preventing emulsion was excessively large (the particle size distribution was in the range of 320nm to 400nm, and the average particle size was larger than 350 nm).
The detection shows that the prepared cement paste has stronger thixotropy, and loses fluidity after the cement paste is kept still for 12min under the conditions of normal temperature and normal pressure. Thickening time of 172min, API dehydration of 36mL, static gelation transition time of 9min, channeling-preventing factor SPN value of 1.39 and cement permeability of 0.1 × 10 of cement paste under the conditions of 145 ℃ and 102Mpa for 60min-3μm2And a strength of 21MPa for 24 hours.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (13)
1. A composite anti-channeling agent for well cementing cement slurry comprises nano-silica anti-channeling emulsion and well cementing latex, wherein the particle size distribution of nano-silica particles in the nano-silica anti-channeling emulsion is in the range of 9nm and 310nm, and the average particle size is in the range of 80nm to 120 nm.
2. The composite anti-channeling agent according to claim 1, wherein the nano silica anti-channeling emulsion and the latex for well cementation are in a mass ratio of (4-7): (2.5-7).
3. The composite anti-channeling agent according to claim 1 or 2, wherein an effective solid content of said nano-silica anti-channeling emulsion is 40-50 wt%.
4. The composite channeling-preventing agent as defined in claim 3 wherein said nanosilica channeling-preventing emulsion has an effective solids content of 44-46% by weight.
5. The composite channeling agent as defined in claim 1 or 2, wherein said nano silica particles are spherical and have surface activity to participate in hydration reaction of cement.
6. The composite channeling agent as defined in claim 1 or 2, wherein said well-cementing latex is styrene-butadiene latex and/or styrene-acrylic latex.
7. A channeling-preventing cement slurry for well cementation, characterized in that the cement slurry comprises the composite channeling-preventing agent according to any one of claims 1 to 6.
8. A cement slurry according to claim 7, characterized in that it comprises the following:
the cement of an oil well,
the composite channeling-preventing agent according to claim 1 or 2,
the silicon powder is mixed with the silicon powder,
the water loss reducing agent is a water loss reducing agent,
a retarder which is formed by mixing a water-soluble polymer,
a dispersant which is a mixture of a dispersant and a surfactant,
a defoaming agent, and
and (3) water.
9. The cement slurry of claim 8, wherein the oil well cement is a grade G oil well cement.
10. A cement slurry according to claim 7, characterized in that the density of the cement slurry is between 1.85 and 1.95g/cm3In the range of (1), the cement paste has an API water loss of less than 50mL, the static gel strength transition time of the cement paste is less than 10min, and the anti-channeling factor SPN value is less than 2.
11. A cement slurry according to claim 8,
the fluid loss agent is AMPS copolymer,
the dispersing agent is a ketone-aldehyde condensate,
the retarder is an organic acid, and the retarder is an organic acid,
the defoaming agent is organic silicone oil.
12. A method of preparing a cement slurry according to any of claims 7 to 11, comprising the steps of:
1) respectively putting 14.5-16 parts by mass of water, 4-7 parts by mass of nano-silica anti-channeling emulsion, 2.5-7 parts by mass of latex for well cementation, 1-2.5 parts by mass of fluid loss additive, 0.1-0.5 part by mass of retarder, 0.2-1 part by mass of dispersant and 0.2-1 part by mass of defoaming agent into a storage tank, and pumping and circulating for at least two hours to obtain stock solution for later use, wherein the particle size of nano-silica particles in the nano-silica anti-channeling emulsion is distributed in the range of 9nm and 310nm, and the average particle size is in the range of 80nm to 120 nm;
2) dry-mixing 45-56 parts by mass of oil well cement and 15-20 parts by mass of silicon powder by using dry mixing equipment to obtain mixed ash for later use;
3) mixing the feed liquid prepared in the step 1) and the mixed ash prepared in the step 2) according to the ratio of (0.35-0.5): 1, preparing cement slurry by using well cementation equipment.
13. The method of claim 12, wherein the oil well cement is a grade G oil well cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610107763.5A CN107129796B (en) | 2016-02-26 | 2016-02-26 | Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610107763.5A CN107129796B (en) | 2016-02-26 | 2016-02-26 | Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107129796A CN107129796A (en) | 2017-09-05 |
| CN107129796B true CN107129796B (en) | 2020-02-18 |
Family
ID=59721075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610107763.5A Active CN107129796B (en) | 2016-02-26 | 2016-02-26 | Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107129796B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108516756A (en) * | 2018-05-17 | 2018-09-11 | 中国石油化工股份有限公司 | High temperature resistance anti-gas channeling cement system and preparation method thereof |
| CN110937857A (en) * | 2018-09-21 | 2020-03-31 | 中国石油化工股份有限公司 | High-temperature-resistant anti-channeling emulsion elastic and tough cement slurry and preparation method thereof |
| CN111704389A (en) * | 2020-07-02 | 2020-09-25 | 中国海洋石油集团有限公司 | Nano channeling-preventing agent, preparation method thereof and channeling-preventing cement slurry |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338184A (en) * | 2007-07-04 | 2009-01-07 | 中国石油集团工程技术研究院 | Water-dispersible oil well cement adulterant |
| CN104610949A (en) * | 2015-02-02 | 2015-05-13 | 中国海洋石油总公司 | Supersaturated potassium chloride cement paste for well cementation |
| CN105038745A (en) * | 2015-05-19 | 2015-11-11 | 成都欧美克石油科技有限公司 | Novel liquid silicon anti-channeling cement slurry used in well cementation |
-
2016
- 2016-02-26 CN CN201610107763.5A patent/CN107129796B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338184A (en) * | 2007-07-04 | 2009-01-07 | 中国石油集团工程技术研究院 | Water-dispersible oil well cement adulterant |
| CN104610949A (en) * | 2015-02-02 | 2015-05-13 | 中国海洋石油总公司 | Supersaturated potassium chloride cement paste for well cementation |
| CN105038745A (en) * | 2015-05-19 | 2015-11-11 | 成都欧美克石油科技有限公司 | Novel liquid silicon anti-channeling cement slurry used in well cementation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107129796A (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107129198B (en) | Weighting agent for anti-channeling well cementation cement slurry, cement slurry and preparation method thereof | |
| CN101326258B (en) | Solvent free fluidized polymer suspensions for oilfield servicing fluids | |
| US9528041B2 (en) | Bionic drilling fluid and preparation method thereof | |
| EP1781754B1 (en) | Fluid loss concentrate for hydraulic cement | |
| US4537918A (en) | Cement compositions for cementing wells, allowing pressure gas-channeling in the cemented annulus to be controlled | |
| CN107129796B (en) | Composite anti-channeling agent, anti-channeling cement slurry for well cementation and preparation method thereof | |
| CN106554766B (en) | Anti-channeling lotion, well cementation leakage-proof mud and preparation method thereof | |
| CN107010890B (en) | Environment-friendly polymer cement wall waterproof slurry and preparation method thereof | |
| CN109266318B (en) | High-temperature-resistant tackifying and shearing-improving agent for water-based drilling fluid, preparation method of high-temperature-resistant tackifying and shearing-improving agent and drilling fluid | |
| CN116218491B (en) | Hydrogel plugging agent, preparation method of hydrogel plugging agent and water-based drilling fluid | |
| CN111433313A (en) | Method and material for converting drilling mud into solid gel type plugging material | |
| CN115043621A (en) | High-density cement slurry resistant to high temperature and carbon dioxide corrosion and preparation method and application thereof | |
| CN110028810A (en) | A kind of preparation method and applications of composite modified nano yttrium oxide | |
| US5898072A (en) | Aqueous suspension of a cellulose ether, method for the production thereof, and composition | |
| CN111040747A (en) | Long horizontal section horizontal well cementing curable pad fluid and application thereof | |
| CN113621355A (en) | Liquid lightening agent and preparation and application thereof | |
| CN112408845A (en) | Dispersion liquid for cement paste, cement paste and preparation method thereof | |
| EP2121868B1 (en) | Stable sodium thiosulfate based fluidized polymer suspensions of hydroxyethyl cellulose for oilfield services | |
| CN110228975B (en) | Preparation process of cement paste | |
| CN110229589B (en) | Anti-corrosion treatment coating suitable for direct-buried heat-insulating pipe and construction process thereof | |
| WO2021225626A1 (en) | Method and materials to convert a drilling mud into a solid gel based lost circulation material | |
| CN109865794B (en) | Production method for preparing casting coating from industrial dust | |
| CN112390564B (en) | Water-based composite emulsion and preparation method and application thereof | |
| CN111704389A (en) | Nano channeling-preventing agent, preparation method thereof and channeling-preventing cement slurry | |
| CN111690154A (en) | Oil-based solvent system with efficient suspension performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |