CN109180084B - Active self-repairing cement slurry system responding to oil gas - Google Patents
Active self-repairing cement slurry system responding to oil gas Download PDFInfo
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- CN109180084B CN109180084B CN201811192946.7A CN201811192946A CN109180084B CN 109180084 B CN109180084 B CN 109180084B CN 201811192946 A CN201811192946 A CN 201811192946A CN 109180084 B CN109180084 B CN 109180084B
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- 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
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- 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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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- 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
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- 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
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Abstract
The invention relates to an active self-repairing cement slurry system responding to oil gas, which comprises oil well cement, fresh water, a self-repairing agent, a fluid loss agent, a dispersing agent, a retarder and a defoaming agent, wherein the proportion of the active self-repairing cement slurry system is based on the weight of the oil well cement: 100 parts of oil well cement, 43.0-47.0 parts of fresh water, 2.0-4.0 parts of self-repairing agent, 1.0-2.0 parts of fluid loss additive, 0.2-0.5 part of dispersing agent, 0.2-1.0 part of retarder and 0.2-0.5 part of defoaming agent. The active self-repairing cement slurry system responding to oil and gas has the characteristics of good rheological property, strong self-repairing capability, good elastic toughness, randomly adjustable thickening time, stable performance, simple formula composition and field construction and the like, can automatically block an oil and gas channeling channel without ground manual intervention when a wellbore cement ring has microcracks and microannulus gaps, recovers the integrity and interfacial cementation capability of the cement ring, and achieves the purpose of preventing casing annulus pressure.
Description
Technical Field
The invention relates to the technical field of well cementation of unconventional oil and gas drilling and completion engineering, in particular to an active self-repairing cement slurry system responding to oil and gas.
Background
The casing annulus pressure is a phenomenon commonly existing in the production process of oil and gas wells at home and abroad, particularly shale gas wells are affected by yield increasing measures such as large-scale segmented fracturing transformation and the like, the casing annulus pressure problem is more prominent, and the safe production and efficient exploration and development of shale gas fields are seriously damaged. At present, measures for solving the problem of casing annulus pressure after well cementation are few, the cost is high, the research on the casing annulus pressure prevention technology is always in the exploration stage, and the method has wide research value and application prospect.
Pressure and temperature excitation operations such as pressure testing, plug drilling, perforation, fracturing transformation, test gas production and the like can cause a shaft cement sheath to generate micro cracks and micro annular gaps, the shaft integrity of the cement sheath is damaged, and interlayer packing failure is caused. Aiming at the problem of casing annulus pressure in the production process of a gas well, from the perspective of cement stones, a novel response scheme, namely an active self-repairing cement slurry system responding to oil gas is provided, so that the ground manual intervention is not needed when micro cracks and micro annular gaps appear on a cement ring, when stratum oil gas flows between layers, hydrocarbon triggers an active material to respond, a flow channel is automatically blocked, the integrity of a body and the interface cementation capability of the cement ring are recovered, the purpose of secondary sealing of the cement ring on a shaft is achieved, and the risk of casing annulus pressure is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an active self-repairing cement slurry system responding to oil gas, which can self-heal micro cracks and micro annular gaps of a cement ring when stratum oil gas flows between layers, so that the aim of secondary sealing of the cement ring on a shaft is fulfilled, and the risk of casing annulus pressure is reduced.
The technical scheme adopted by the invention for solving the technical problems is as follows: an active self-repairing cement slurry system which responds to oil gas is constructed, and comprises oil well cement, fresh water, a self-repairing agent, a fluid loss agent, a dispersing agent, a retarder and a defoaming agent, wherein the weight of the oil well cement is taken as a reference in the ratio of: 100 parts of oil well cement, 43.0-47.0 parts of fresh water, 2.0-4.0 parts of self-repairing agent, 1.0-2.0 parts of fluid loss additive, 0.2-0.5 part of dispersing agent, 0.2-1.0 part of retarder and 0.2-0.5 part of defoaming agent.
According to the scheme, the density of the cement paste is 1.87g/cm3-1.90g/cm3。
According to the scheme, the self-repairing agent is one or a mixture of two of modified polyvinyl alcohol polymer, fumaric acid-vinyl acetate copolymer and styrene-butadiene copolymer in any proportion. Wherein the modified polyvinyl alcohol polymer is obtained by carrying out high molecular polymerization reaction on polyvinyl alcohol, dodecyl alcohol and sodium dodecyl sulfate according to the molar ratio of 0.5-0.8:1: 0.1-0.3; the self-repairing agent is gray powder, and the particle density is 1.35g/cm3-1.55g/cm3The fineness is 0.900mm square hole sieve, the sieve allowance is less than or equal to 5.0 percent, and the volume expansion rate in kerosene medium is more than or equal to 15 percent.
According to the scheme, the fluid loss agent is one or a mixture of two of carboxymethyl cellulose and polyacrylamide according to any proportion. Wherein the carboxymethyl cellulose is prepared by etherification reaction of cotton cellulose, propylene oxide and methyl chloride at 60-80 ℃ under the alkaline condition according to the molar ratio of 1-2:1:0.3-0.5, and has good hydrophilicity. In addition, other conventional cement fluid loss additives, such as polyvinyl alcohol or anionic polymer fluid loss additives, may also be used in the present invention. Fluid loss additives of the present invention are commercially available, for example, as the product designated FLO-S from carhua, vitex.
According to the scheme, the dispersing agent is one or a mixture of two of polycarboxylic acid polymer or naphthalene sulfonate according to any proportion. Wherein the polycarboxylic acid is obtained by etherification reaction of carboxylic acid, ethylene oxide and propylene oxide according to the molar ratio of 1:0.2-0.5: 0.2-0.4. Conventional organic or inorganic salt dispersants may be used in the present invention. The dispersants of the present invention are commercially available, for example, as the dispersant product USZ from Henan Weihui.
According to the scheme, the retarder is one or a mixture of two of sodium gluconate and sodium carboxymethyl cellulose in any proportion. The retarder of the invention can be purchased from the market, for example, the retarder with the product code of BS200 is carried and spread in Sichuan.
According to the scheme, the defoaming agent is one or a mixture of two of polyvinyl ether and higher alcohol in any proportion. The antifoam agent of the present invention is commercially available, for example, as the product of Henan Celhui under the designation XP-1.
According to the scheme, the oil well cement is G-grade oil well cement, belongs to Portland portland cement, mainly comprises tricalcium aluminate, tetracalcium aluminoferrite, tricalcium silicate and dicalcium silicate in chemical components, and requires that the specific surface area is not less than 300m2The grain size is 5um-20um per kg, and the screen residue of 80um sieve pores is not more than 10%. Grade G well cement produced by, for example, carhua or sanxia, may be used in the present invention.
According to the scheme, the oil gas is a stratum hydrocarbon fluid and comprises alkane or aromatic hydrocarbon gas and liquid, and the number of carbon atoms is 1-22.
The invention relates to a preparation method of an oil-gas response active self-repairing cement slurry system, which comprises the following steps: under the condition of room temperature, sequentially mixing and stirring the self-repairing agent, the fluid loss additive and the dispersing agent with oil well cement in a sample bag to form slurry blending ash, wherein when one additive is added, the next additive needs to be added after the additive is uniformly stirred; sequentially adding fresh water, a retarder and a defoaming agent into a slurry cup to form slurry preparation medicine water, wherein after each additive is added, the next additive needs to be added after the additives are uniformly stirred; under the condition of low-speed stirring, adding the prepared slurry ash into the drug water within 10-15s, and uniformly stirring and mixing, wherein the stirring speed is 3500-4000 RPM; then stirring at 10000-12000RPM for 30-35 s.
The implementation of the oil-gas response active self-repairing cement slurry system has the following beneficial effects:
(1) the active self-repairing material has good physical and chemical properties, the 0.900mm screen allowance is less than or equal to 5.0 percent, the construction of mixing and stirring is easy, the volume expansion rate in oil is more than or equal to 15 percent, and the good response capability in oil gas is shown;
(2) the active self-repairing material has good compatibility with other additives such as a fluid loss agent, a dispersing agent and the like, a thickening curve is smooth, no bulge exists, the thickening time can be adjusted within 90-360min at will, and the safe construction requirement of well cementation is met;
(3) the thickening time of the cement paste is randomly adjustable within 90-360min, the conversion time is less than or equal to 10min, the SPN is less than 3, and the cement paste has excellent gas channeling prevention performance;
(4) the compression strength of the set cement is more than 20MPa/24h, the elastic modulus is less than 8GPa, and the set cement has better rock mechanical property;
(5) the recovery rate of the compression strength of the set cement is more than 50 percent, the recovery rate of the interfacial cementation strength is more than 60 percent, and the cement mortar has better secondary sealing effect on the well shaft annulus.
The active self-repairing cement slurry system responding to oil and gas has the characteristics of good rheological property, strong self-repairing capability, good elastic toughness, randomly adjustable thickening time, stable performance, simple formula composition and field construction and the like, can automatically block an oil and gas channeling channel without ground manual intervention when a wellbore cement ring has microcracks and microannulus gaps, recovers the integrity and interfacial cementation capability of the cement ring, and achieves the purpose of preventing casing annulus pressure.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a graph of reactive self-healing cement slurry thickening (thickening time 185 min);
fig. 2 is an electron microscope micrograph (SEM 5000X) of the reactive self-healing set cement repairing microcracks.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The invention relates to an active self-repairing cement paste system responding to oil gas, which is prepared according to the cement paste density of 1.88g/cm3The cement is prepared from 800G of Jiahua G-grade oil well cement, 360mL of fresh water, 20G of modified polyvinyl alcohol polymer self-repairing agent, 18G of carboxypropyl methyl cellulose fluid loss agent, 4G of polycarboxylic acid dispersing agent, 6mL of sodium gluconate retarder and 4mL of polyvinyl ether defoaming agent.
The preparation method of the active self-repairing cement slurry system responding to oil gas comprises the following steps: weighing 800G of Jiahua G-grade oil well cement in a sample bag, adding 20G of modified polyvinyl alcohol polymer self-repairing agent, and uniformly mixing; then adding 18g of carboxymethyl cellulose fluid loss agent and uniformly mixing; then adding 4g of polycarboxylic acid dispersant, and uniformly mixing to form slurry blending ash; measuring 360mL of fresh water by using a pulp cup, adding 6mL of sodium gluconate retarder under the condition of low-speed stirring (500r/min), and stirring for 5 s; then adding 4mL of polyvinyl ether defoaming agent, and stirring for 5 s; after uniformly mixing, adding the prepared slurry ash in the sample bag into a slurry cup within 15s, and stirring at 4000 RPM; and then stirring at high speed for 35s at 12000RPM to obtain the self-repairing cement paste system responding to oil and gas.
The performance of the self-repairing cement paste system which is prepared by the embodiment and responds to oil gas is shown in table 1, and all parameters are measured indoors, wherein the compressive strength test is that after the cement paste is prepared, the cement paste is poured into a square mould with the thickness of 50.4mm multiplied by 50.4mm, and is subjected to water bath curing for 48 hours in a high-temperature high-pressure strength curing kettle at the temperature of 21MPa multiplied by 75 ℃; initial consistency: the consistency of the cement paste within 10min after preparation is finished; thickening transition time: under the conditions of high temperature and high pressure, the time required by the consistency of the cement paste from 30BC to 100BC reflects the speed of the strength development of the cement paste; free liquid: simulating the amount of free liquid of cement slurry formed by standing the cement slurry under the condition of a shaft, and reflecting the sedimentation stability of the cement slurry; water loss: the amount of free water lost by the cement slurry under the conditions specified by API (6.9MPa, 30 min); and (3) rock mechanical testing: drilling, coring, cutting and polishing to prepare a standard cylindrical sample with the diameter of 25mm x 50mm from the set cement, and testing the mechanical property of the rock on an RMT multifunctional rock mechanical testing system; compressive strength recovery rate: after the cement stone is subjected to prestress damage, the compressive strength is measured after the diesel oil medium is maintained for a certain time, and the sealing recovery performance of the cement stone body is reflected; interface bond strength recovery rate: and after the interface cementation test die is sheared and damaged, maintaining the diesel medium for a certain time, and then measuring the interface cementation strength to react the cement-stone cementation sealing recovery performance.
The cement slurry performance determination method is executed according to the following petroleum industry standards:
1. oil well cement application Performance test method SY/T5546-
2. Oil well cement slurry Performance requirements SY/T6544-2003 (the cement slurry Performance requirements are carried out in accordance with the present standards)
TABLE 1 Experimental data on the Performance of the Cement slurry System
As can be seen from Table 1, the active self-repairing cement slurry system responding to oil gas has the characteristics of good rheological property, strong repairing capability, good elastic toughness, randomly adjustable thickening time, stable performance, simple formula composition, simple field construction and the like, can automatically block an oil gas channeling channel without ground manual intervention when a wellbore cement ring has microcracks and microannulus, recovers the integrity and interface cementing capability of the cement ring, and achieves the purpose of preventing the annulus pressure of a casing.
The active self-repairing cement paste responding to oil and gas has the excellent performances of low initial consistency, smooth curve and short thickening transition time, and the thickening curve is shown in figure 1. After the active self-repairing set cement meets oil gas, the crack is covered by a large amount of three-dimensional network-shaped gelled substances, the set cement on two sides of the crack is organically connected together, and the microcrack is effectively repaired, as shown in figure 2.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention. While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. An active self-repairing cement slurry system responding to oil gas is characterized by comprising oil well cement, fresh water, a self-repairing agent, a fluid loss agent, a dispersing agent, a retarder and a defoaming agent, wherein the weight of the oil well cement is taken as a reference in the proportioning: 100 parts of oil well cement, 43.0-47.0 parts of fresh water, 2.0-4.0 parts of self-repairing agent, 1.0-2.0 parts of fluid loss additive, 0.2-0.5 part of dispersing agent, 0.2-1.0 part of retarder and 0.2-0.5 part of defoaming agent; the self-repairing agent is a modified polyvinyl alcohol polymer, and the modified polyvinyl alcohol polymer is obtained by carrying out high-molecular polymerization reaction on polyvinyl alcohol, dodecyl alcohol and sodium dodecyl sulfate according to a molar ratio of 0.5-0.8:1: 0.1-0.3.
2. The hydrocarbon-gas responsive active self-healing cement slurry system of claim 1, wherein the cement slurry density is 1.87g/cm3-1.90g/cm3。
3. The oil-gas responsive active self-repairing cement slurry system as claimed in claim 1, wherein the self-repairing agent is gray powder, and the particle density is 1.35g/cm3-1.55g/cm3A square-hole sieve with fineness of 0.900mm and the sieve residue of less than or equal to 5.0 percent, in keroseneThe volume expansion rate in the medium is more than or equal to 15 percent.
4. The oil-gas responsive active self-repairing cement slurry system as claimed in claim 1, wherein the fluid loss agent is one or a mixture of two of carboxymethyl cellulose and polyacrylamide in any proportion.
5. The oil-gas responsive active self-repairing cement slurry system as claimed in claim 4, wherein the carboxypropylmethyl cellulose is prepared by etherification reaction of alkali fiber, propylene oxide and methyl chloride at 60-80 ℃ under an alkaline condition according to a molar ratio of 1-2:1: 0.3-0.5.
6. The oil-gas responsive active self-repairing cement slurry system as claimed in claim 1, wherein the dispersant is one or a mixture of two of polycarboxylic acid polymer or naphthalene sulfonate in any proportion.
7. The oil-gas responsive active self-repairing cement slurry system as claimed in claim 6, wherein the polycarboxylic acid is obtained by etherification reaction of carboxylic acid, ethylene oxide and propylene oxide according to a molar ratio of 1:0.2-0.5: 0.2-0.4.
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| CN109912792B (en) * | 2019-03-29 | 2019-11-08 | 西南石油大学 | A kind of hardened oilwell cement water-swellable self-repair material and preparation method thereof |
| CN112540025A (en) * | 2019-09-23 | 2021-03-23 | 中国石油化工股份有限公司 | Testing device and method for simulating gas self-repairing performance of shaft and cement sheath |
| CN111072328B (en) * | 2019-12-30 | 2022-03-04 | 中国海洋石油集团有限公司 | Oil well micro-crack self-healing material and preparation method thereof |
| CN111153650B (en) * | 2020-01-08 | 2022-02-22 | 太原理工大学 | MICP technology-based mining plugging material |
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