CN112625663A - Well cementation composite leaking stoppage isolation liquid system and application thereof - Google Patents
Well cementation composite leaking stoppage isolation liquid system and application thereof Download PDFInfo
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- CN112625663A CN112625663A CN201910906829.0A CN201910906829A CN112625663A CN 112625663 A CN112625663 A CN 112625663A CN 201910906829 A CN201910906829 A CN 201910906829A CN 112625663 A CN112625663 A CN 112625663A
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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
- C09K8/426—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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a composite plugging spacer fluid system for well cementation, which comprises water, temperature-sensitive expansion fine particles, temperature-sensitive expansion fibers, fine fibers and a weighting agent. The composite well cementation leaking stoppage isolating liquid system provided by the invention has the advantages that on the premise of ensuring the pumpability of fluid, the bridging and deformation filling capabilities of the isolating liquid are improved, the leaking stoppage effect is enhanced, the bearing capacity of a malignant leaking stratum is improved, a good shaft environment is provided for well cementation construction, and the composite well cementation leaking stoppage isolating liquid system has good application and popularization values.
Description
Technical Field
The invention belongs to the field of petroleum exploration, and particularly relates to a well cementation composite leaking stoppage isolation liquid system and application thereof.
Background
In the drilling engineering, when the drill encounters a natural crack development, a hole type or a broken stratum, because the pressure-bearing capacity of an open hole section of a shaft is low, in the process of injecting and replacing well cementation cement slurry, the loss of return leakage is easy to occur, so that the cement return height is insufficient, and the well cementation quality is seriously restricted. Aiming at the difficult problem of well cementation malignant leakage, on the basis of improving the bearing capacity of the stratum and optimizing the performance of the leaking stoppage cement slurry, a leaking stoppage front liquid system is further adopted to block the position of the easy leakage layer of the open hole section, and relatively good shaft conditions are provided for cement slurry injection replacement.
At present, the main method for preparing the plugging system of the plugging spacer fluid is to blend bridging plugging materials. The Losseal reinforced composite anti-leakage fiber system is developed by Schlumberger, and a network structure is formed on the well wall of a leakage layer through solid particle bridging and fiber accumulation to block cracks; an MS type high-temperature leaking stoppage spacer fluid system is developed by the Chinese petrochemical engineering institute, and a high-temperature leaking stoppage effect is formed by compounding high-temperature suspending agents, polypropylene or polypropylene fibers, vermiculite and other leaking stoppage particles; the thixotropic spacer fluid is developed by China university of Petroleum (east China), the thixotropy, the rheological property and the suspension stability of the system are good, and the plugging performance is further improved by compounding a bridging material; the curable leakage stoppage spacer fluid is prepared from materials such as slag powder, clay, bentonite and the like, has good fluidity, and can be cured together with cement paste and residual mud cakes, so that the formation can be effectively sealed.
In conclusion, the plugging pad fluid system has a good plugging effect on pores and fractured formations, but is limited by the particle size and the compound concentration of the plugging material, the plugging effect on pore-type or fractured formations is not obvious, and a well cementation composite plugging spacer fluid system based on a novel expansion material needs to be further developed.
Disclosure of Invention
Aiming at the difficult problems of natural crack development, hole type and fractured formation well cementation and leakage, the invention provides a well cementation composite leakage stoppage spacer fluid system based on a temperature sensitive expanded polymer, which improves the bridging and deformation filling capabilities of the spacer fluid, enhances the leakage stoppage effect and provides technical support for malignant lost formation well cementation on the premise of ensuring the pumpability of fluid.
In a first aspect, the invention provides a composite lost circulation material, which comprises temperature-sensitive expansion fine particles, temperature-sensitive expansion fibers, fine fibers and a weighting agent.
According to the invention, the temperature-sensitive expansion fine particles and the temperature-sensitive expansion fibers are a shape memory material which can be reversibly deformed along with the temperature change. It has two forms, one is an expanded form, i.e., an original memory state, and one is a compressed form, i.e., a deformed form. In the temperature range higher than the glass transition temperature, the temperature-sensitive material can be softened and can be compressed and changed by external force; in the temperature range below its glass transition temperature, the material gradually hardens, generally being processed at a temperature of 0-20 ℃ and at a pressure of 0.1MPa (atmospheric pressure).
According to some embodiments of the invention, the temperature-sensitive expanding fine particles are virgin fine particles at 60-150 ℃, preferably at 90-110 ℃, and after compression are deformed fine particles.
According to some embodiments of the invention, the as-received fine particles are porous networks or spheres.
According to some embodiments of the invention, the size of the as-received fine particles is from 10 to 20 mm.
According to some embodiments of the invention, the size of the morphable fine particles is 10 to 350 mesh.
According to some embodiments of the invention, the temperature-sensitive expanding fibers are virgin fibers at 60-150 ℃, preferably at 90-110 ℃, and are compressed into deformed fibers.
According to some embodiments of the invention, the as-spun fibers have a diameter of 5 to 400 μm and a length of 0.5 to 10 cm.
According to some embodiments of the invention, the metamorphic fiber has a diameter of 5 to 400 μm and a length of 5 to 10 mm.
According to some embodiments of the invention, the compression is at a temperature of 0-20 ℃ and a pressure of 0.1 MPa.
According to some embodiments of the invention, the thermo-sensitive point of the deformed fine particles is adjustable between 60 and 150 ℃. After reaching the measured temperature of the leakage layer of the open hole section, the porous structure can be expanded into an original state porous network structure or a sphere with the thickness of 10-20mm again so as to provide a skeleton structure for the leakage plugging isolation liquid.
According to some embodiments of the invention, the morphable fiber temperature sensitive point is tunable between 60 ℃ and 150 ℃. After reaching the measured temperature of the leakage layer of the open hole section, the fiber can be expanded to 0.5-10cm of original state fiber again so as to provide a bridging network for the leakage plugging isolation fluid.
In the invention, the temperature-sensitive point of the deformed fine particles and the temperature-sensitive point of the deformed fibers can be regulated and controlled by a specific preparation method according to field use conditions, for example, the glass transition temperature of the material is regulated by regulating the molar ratio of isocyanate to hydroxyl groups of the material, so that the temperature-sensitive points are regulated.
According to some embodiments of the invention, the thermo-sensitive expanding fine particles comprise one or more selected from the group consisting of epoxy, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene and polyamide.
According to some embodiments of the invention, the temperature-sensitive expandable fiber comprises one or more selected from the group consisting of epoxy, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene, and polyamide.
According to some embodiments of the invention, the microfine fibers comprise inorganic fibers and/or organic fibers.
According to a preferred embodiment of the present invention, the microfine fibers are selected from one or more of polyacrylamide, polypropylene, glass fiber, quartz glass fiber, boron fiber and ceramic fiber, and preferably, the microfine fibers have a diameter of 100 μm and a length of 5 to 10 mm.
According to some embodiments of the invention, the weighting agent is selected from one or more of slag, silica fume, iron ore fines and barite.
According to the preferred embodiment of the invention, the slag is 50-100 meshes, the silicon powder is 80-200 meshes, the iron ore powder is 300-400 meshes, and the barite is 300-400 meshes.
In a second aspect, the invention provides a composite plugging spacer fluid system for well cementation, which comprises water, temperature-sensitive expansion fine particles, temperature-sensitive expansion fibers, fine fibers and a weighting agent.
According to some embodiments of the invention, the composite lost circulation material comprises the following components: 100 parts of water, 2-5 parts of temperature-sensitive expanded fine particles, 1-2 parts of temperature-sensitive expanded fibers, 0.2-1.5 parts of fine fibers and 50-150 parts of weighting agent.
According to the invention, the temperature-sensitive expansion fine particles and the temperature-sensitive expansion fibers are a shape memory material which can be reversibly deformed along with the temperature change. It has two forms, one is an expanded form, i.e., an original memory state, and one is a compressed form, i.e., a deformed form. In the temperature range higher than the glass transition temperature, the temperature-sensitive material can be softened and can be compressed and changed by external force; in the temperature range below its glass transition temperature, the material gradually hardens, generally being processed at a temperature of 0-20 ℃ and at a pressure of 0.1MPa (atmospheric pressure).
According to some embodiments of the invention, the temperature-sensitive expanding fine particles are virgin fine particles at 60-150 ℃, preferably at 90-110 ℃, and after compression are deformed fine particles.
According to some embodiments of the invention, the as-received fine particles are porous networks or spheres.
According to some embodiments of the invention, the size of the as-received fine particles is from 10 to 20 mm.
According to some embodiments of the invention, the size of the morphable fine particles is 10 to 350 mesh.
According to some embodiments of the invention, the temperature-sensitive expanding fibers are virgin fibers at 60-150 ℃, preferably at 90-110 ℃, and are compressed into deformed fibers.
According to some embodiments of the invention, the as-spun fibers have a diameter of 5 to 400 μm and a length of 0.5 to 10 cm.
According to some embodiments of the invention, the metamorphic fiber has a diameter of 5 to 400 μm and a length of 5 to 10 mm.
According to some embodiments of the invention, the compression is at a temperature of 0-20 ℃ and a pressure of 0.1 MPa.
According to some embodiments of the invention, the thermo-sensitive point of the deformed fine particles is adjustable between 60 and 150 ℃. After reaching the measured temperature of the leakage layer of the open hole section, the porous structure can be expanded into an original state porous network structure or a sphere with the thickness of 10-20mm again so as to provide a skeleton structure for the leakage plugging isolation liquid.
According to some embodiments of the invention, the morphable fiber temperature sensitive point is tunable between 60 ℃ and 150 ℃. After reaching the measured temperature of the leakage layer of the open hole section, the fiber can be expanded to 0.5-10cm of original state fiber again so as to provide a bridging network for the leakage plugging isolation fluid.
In the invention, the temperature-sensitive point of the deformed fine particles and the temperature-sensitive point of the deformed fibers can be regulated and controlled by a specific preparation method according to field use conditions, for example, the glass transition temperature of the material is regulated by regulating the molar ratio of isocyanate to hydroxyl groups of the material, so that the temperature-sensitive points are regulated.
According to some embodiments of the invention, the thermo-sensitive expanding fine particles comprise one or more selected from the group consisting of epoxy, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene and polyamide.
According to some embodiments of the invention, the temperature-sensitive expandable fiber comprises one or more selected from the group consisting of epoxy, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene, and polyamide.
According to some embodiments of the invention, the microfine fibers comprise inorganic fibers and/or organic fibers.
According to a preferred embodiment of the present invention, the microfine fibers are selected from one or more of polyacrylamide, polypropylene, glass fiber, quartz glass fiber, boron fiber and ceramic fiber, and preferably, the microfine fibers have a diameter of 100 μm and a length of 5 to 10 mm.
According to some embodiments of the invention, the weighting agent is selected from one or more of slag, silica fume, iron ore fines and barite. The density of the spacer fluid is 1.30-1.80g/cm along with the change of the adding amount of the weighting agent3The range is adjustable. After the leakage stoppage spacer fluid loses water, slag and other fine solid-phase particles are beneficial to forming mud cakes, and the pores of the leakage stoppage bridging network are further filled.
According to the preferred embodiment of the invention, the slag is 50-100 meshes, the silicon powder is 80-200 meshes, the iron ore powder is 300-400 meshes, and the barite is 300-400 meshes.
According to some embodiments of the invention, the cementing cement slurry system further comprises other additives comprising at least one selected from the group consisting of high temperature suspension stabilizers, high temperature retarders and defoamers.
According to a preferred embodiment of the present invention, the other additives include 8 to 15 parts by weight of a high temperature suspension stabilizer, 0.5 to 3 parts by weight of a high temperature retarder, and 0.2 to 1.5 parts by weight of an antifoaming agent.
According to some embodiments of the invention, the high temperature suspension stabilizer is selected from one or more of xanthan gum, guar gum, microsilica and bentonite. The high-temperature suspension stabilizer resists temperature of more than 150 ℃ and is used for suspending the temperature-sensitive expansion material and the weighting agent to keep the stability of slurry.
According to some embodiments of the invention, the high temperature slow release agent is selected from one of hydroxycarboxylic acids, organophosphates, inorganic acids, and AA multipolymers. The addition of the high-temperature retarder can enhance the similarity of the isolation fluid, the drilling fluid and cement paste and improve the anti-pollution performance of the isolation fluid.
The defoaming agent is at least one selected from tributyl esters and organic silicone oil, and can inhibit or eliminate bubbles in the spacer fluid.
In a third aspect, the invention provides a preparation method of the well cementation composite leaking stoppage spacer fluid system according to the second aspect, which comprises the following steps:
(1) mixing and stirring the temperature-sensitive expanded fine particles, the temperature-sensitive expanded fibers, the fine fibers and a weighting agent to obtain a solid mixture;
(2) stirring water and the other additives into a liquid mixture;
(3) and adding the solid mixture into the liquid mixture and stirring to obtain the well cementation cement slurry system.
In a fourth aspect, the invention provides the use of the composite lost circulation spacer fluid system for cementing in accordance with the second aspect in natural fracture development, in hole-type and fractured formation cementing.
The cementing composite leaking stoppage spacer fluid system based on the temperature-sensitive expanded polymer provided by the invention has the following beneficial effects: at low temperature, the slurry is convenient to mix, easy to pump and good in slurry fluidity; under high temperature, a large-size and multi-scale bridging leaking stoppage network structure can be formed; the system temperature sensitive point is adjustable between 60 ℃ and 150 ℃, and the high temperature resistance is realized; the density is 1.30-1.80g/cm3The adjustable well plugging agent is adjustable, and indoor experiments prove that the agent can effectively plug 4mm cracks, has the pressure bearing capacity of more than 7MPa, is beneficial to improving the pressure bearing capacity of a malignant leakage stratum, provides a good shaft environment for well cementing construction, and has good application and popularization values.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Used in the following examples and comparative examples:
the fresh water refers to water with salt content less than 0.5 g/L;
the weighting agent is slag;
the high temperature suspension stabilizer was xanthan gum, available from continental shelf, texas;
the high temperature retarder is organic phosphate (2-phosphoryl-1, 2, 4-tricarboxylic acid) purchased from continental shelf, texas;
the defoamer is a latex defoamer with the model number of DZX-2, purchased from Dahurian, Tex;
polypropylene microfiber, model SFP-2, available from texas continental shelf.
The preparation method of the raw materials comprises the following steps:
1. preparation method of polyethylene temperature-sensitive expansion material with temperature-sensitive point of 150 DEG C
Mixing 50mL of liquid paraffin and 3mL of composite emulsifier, and stirring at room temperature until the emulsifier and the oil-soluble solvent are completely mixed to prepare an oil phase; putting 0.5g of polyvinyl alcohol and 1g N-isopropyl acrylamide into 10mL of deionized water, stirring at room temperature for 10min until the polyvinyl alcohol and the N-isopropyl acrylamide are completely dissolved, and adding 0.25mL of hydrochloric acid and 0.25mL of glutaraldehyde to prepare a water phase; slowly dropping the water phase into the oil phase under stirring at room temperature, and stirring for 10min until the water phase is uniformly dispersed in the oil phase. Heating at 150 ℃ for 30min, slowly dropwise adding 0.1mL of tetraethylenepentamine into the oil phase, adding 0.04g of dibenzoyl peroxide, continuing to react for 3h, centrifuging after the reaction, cleaning with ethanol, drying in a vacuum oven at 80 ℃ for 48 h, and drying to obtain the final product.
2. Polyethylene thermo-sensitive expanded fine particles with thermo-sensitive points of 150 ℃:
the polyethylene temperature-sensitive expansion material with the temperature-sensitive point of 150 ℃ is selected, processed into an original state porous network structure or a sphere with the thickness of 10-20mm at the temperature of 150 ℃ (the glass transition temperature), and frozen and compressed at the temperature of 0 ℃ to form the morphotropic fine particles with the size of 10-350 meshes. The material can be re-stretched into a 10-20mm net structure or a sphere under the condition of 150 ℃.
3. Polyethylene temperature-sensitive expansion fiber with temperature-sensitive point of 150 ℃:
the polyethylene temperature-sensitive expansion material with the temperature-sensitive point of 150 ℃ is selected, processed into original fibers with the diameter of 5-400 mu m and the length of 0.5-10cm at the temperature of 150 ℃ (glass transition temperature), and frozen and compressed at the low temperature of 0 ℃ into deformed fibers with the diameter of 5-400 mu m and the length of 5-10 mm. The material can be re-stretched into fiber with diameter of 5-400 μm and length of 0.5-10cm at 150 deg.C.
4. Preparation method of polyethylene temperature-sensitive expansion material with temperature-sensitive point of 60 DEG C
Mixing 50mL of liquid paraffin and 3mL of composite emulsifier, and stirring at room temperature until the emulsifier and the oil-soluble solvent are completely mixed to prepare an oil phase; putting 0.5g of polyvinyl alcohol and 1g N-isopropyl acrylamide into 10mL of deionized water, stirring at room temperature until the polyvinyl alcohol and the N-isopropyl acrylamide are completely dissolved, and adding 0.25mL of hydrochloric acid and 0.25mL of glutaraldehyde to prepare a water phase; slowly dropping the water phase into the oil phase under stirring at room temperature, and stirring for 10min until the water phase is uniformly dispersed in the oil phase. Heating at 60 ℃ for 30min, slowly dropwise adding 0.1mL of tetraethylenepentamine into the oil phase, adding 0.016g of dibenzoyl peroxide, continuing to react for 3h, centrifuging after the reaction, cleaning with ethanol, drying in a vacuum oven at 80 ℃ for 48 h, and drying to obtain the final product.
5. Polyethylene temperature sensitive expansion fine particles with temperature sensitive points of 60 ℃:
the polyethylene temperature-sensitive expansion material with the temperature-sensitive point of 60 ℃ is selected, processed into an original state porous network structure or a sphere with the thickness of 10-20mm at the temperature of 60 ℃ (glass transition temperature), and frozen and compressed at the temperature of 0 ℃ to form the morphotropic fine particles with the size of 10-350 meshes. The material can be re-stretched into a 10-20mm net structure or a sphere under the condition of 60 ℃.
6. Polyethylene temperature-sensitive expansion fiber with temperature-sensitive point of 60 ℃:
the polyethylene temperature-sensitive expansion material with the temperature-sensitive point of 60 ℃ is selected, processed into original fibers with the diameter of 5-400 mu m and the length of 0.5-10cm at the temperature of 60 ℃ (glass transition temperature), and frozen and compressed at the low temperature of 0 ℃ into deformed fibers with the diameter of 5-400 mu m and the length of 5-10 mm. The material can be re-stretched into fiber with diameter of 5-400 μm and length of 0.5-10cm at 60 deg.C.
Example 1
(1) Weighing 500g of fresh water, 15g of polyethylene temperature-sensitive expansion fine particles (the temperature-sensitive point of the particles is 150 ℃, the mesh number is 4-400 meshes), 7.5g of polyethylene temperature-sensitive expansion fibers (the temperature-sensitive point of the fibers is 150 ℃, the length is 0.05-10cm, and the diameter is 5-300 mu m), 1.5g of polypropylene fine fibers, 300g of weighting agent, 50g of high-temperature suspension stabilizer, 5g of high-temperature retarder and 1.5g of defoaming agent.
(2) And uniformly mixing the weighed temperature-sensitive expanded fine particles, temperature-sensitive expanded fibers, fine fibers and weighting agent to obtain mixed powder.
(3) And uniformly mixing the weighed fresh water, the high-temperature suspension stabilizer, the high-temperature retarder and the defoaming agent to obtain a mixed liquid.
(4) Adding the mixed liquid into a mixing container, rotating a stirrer at a low speed (4000 +/-200 revolutions per minute), uniformly mixing the mixed liquid within 15 seconds to obtain mixed powder, covering a cover of the stirrer, continuously stirring the mixed powder at a high speed (12000 +/-500 revolutions per minute) for 35 seconds, and uniformly stirring to obtain a well cementation composite plugging spacer fluid system based on the temperature sensitive expanded polymer, wherein the density of the well cementation composite plugging spacer fluid system is 1.30g/cm3。
Examples 2 to 3
The only difference from example 1 was that the slag weighting agents used were 475g and 725g, respectively, giving densities of 1.40g/cm, respectively3And 1.50g/cm3The well cementation composite leaking stoppage spacer fluid system.
Examples 4 to 6
The only difference from example 1 is that the weighting agent used was heavy diamond, the contents of which were 550g, 675g and 750g, respectively, giving densities of 1.60g/cm, respectively3、1.70g/cm3And 1.80g/cm3The well cementation composite leaking stoppage spacer fluid system.
Examples 7 to 9
The difference from example 1 was only that the addition amounts of the polyethylene temperature-sensitive expanded fine particles were 20, 10g and 0g, respectively, to give a density of 1.30g/cm3The well cementation composite leaking stoppage spacer fluid system.
Examples 10 to 12
The difference from example 1 was only that the addition amounts of the polyethylene temperature-sensitive expanded fibers were 10, 5g and 0g, respectively, to obtain a density of 1.30g/cm3The well cementation composite leaking stoppage spacer fluid system.
Examples 13 to 15
The difference from example 1 was only that the polypropylene microfine fibers were added in amounts of 2g, 1g and 0g, respectively, to give a density of 1.30g/cm3Well cementation composite plugAnd (4) leakage spacer fluid system.
Example 16
The difference from the example 1 is only that the temperature sensitive point of the particle of the polyethylene temperature sensitive expansion fine particle is controlled to be 60 ℃, the temperature sensitive point of the fiber of the polyethylene temperature sensitive expansion fiber is controlled to be 60 ℃, and the density is 1.30g/cm3The well cementation composite leaking stoppage spacer fluid system.
The rheometer shear stress reading and fluidity of the well cementation composite leaking stoppage spacer system obtained in the embodiment 1-15 are respectively carried out at the temperature of 20 ℃ and 150 ℃; and a spacer fluid plugging experiment was performed on the well cementation composite plugging spacer fluid system obtained in examples 1-15 at 150 ℃.
The rheometer shear stress reading and fluidity of the well cementation composite leaking stoppage spacer fluid system obtained in example 16 are carried out at 20 ℃ and 60 ℃; and a spacer fluid plugging experiment was performed on the well cementation composite plugging spacer fluid system obtained in example 16 at 60 ℃, and the rheological and plugging properties thereof are shown in table 1.
In the examples of the application, the slurry rheological properties, fluidity test and API fluid loss test were carried out according to the standard GB/T19139-.
In the embodiment of the application, the concrete method for the fracture pressure-bearing plugging capability experiment comprises the following steps:
(1) filling a leakage blocking and isolating liquid into a 12L container, wherein a crack with the width of 4mm is designed at the outlet of the container, and a constant-flow servo pump is designed at the bottom of the container;
(2) and pumping the isolation liquid in the container out of the outlet through a constant flow pump (with the flow rate of 200-.
TABLE 1
As can be seen from Table 1, after the temperature-sensitive plugging pre-liquid system is maintained at the temperature of 20 ℃ and the normal temperature for 20min, the shear stress reading of a rheometer is small, and the measured fluidity is not less than 22cm, which indicates that the pumpability is good and the temperature-sensitive plugging material is not expanded; after the high-temperature-resistant high. From the example 1 and the examples 7 to 15, it can be known that the addition amounts of the polyethylene temperature-sensitive expanded fine particles, the polyethylene temperature-sensitive expanded fibers and the polypropylene fibers are in negative correlation with the slurry fluidity, and are in positive correlation with the API filtration loss and the pressure-bearing plugging capability. Under the conditions of 60 ℃ and 150 ℃, the isolation liquid leakage stoppage experiment shows that the pressure bearing capacity of a 4mm crack filled with the isolation liquid is generally greater than 7MPa, and a good leakage stoppage effect is embodied.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A composite leakage-stopping material is composed of the temp-sensitive expandable microparticles, temp-sensitive expandable fibres, microfine fibres and weighting agent.
2. The composite lost circulation material of claim 1, wherein the temperature-sensitive expandable fine particles are virgin fine particles at 60-150 ℃, preferably at 90-110 ℃, and are deformed fine particles after compression; preferably, the original state fine particles are porous network structures or spheres; further preferably, the size of the original state fine particles is 10 to 20mm, and/or the size of the morphable fine particles is 10 to 350 mesh; and/or
The temperature-sensitive expansion fiber is an original fiber at 60-150 ℃, preferably 90-110 ℃, and is a deformed fiber after being compressed, preferably, the diameter of the original fiber is 5-400 μm, the length of the original fiber is 0.5-10cm, and/or the diameter of the deformed fiber is 5-400 μm, and the length of the deformed fiber is 5-10 mm; and/or
The temperature sensitive point of the deformation state fine particles is adjustable between 60 and 150 ℃, and/or
The temperature sensitive point of the deformed fiber is adjustable between 60 and 150 ℃;
preferably, the compression temperature is 0-20 ℃ and the pressure is 0.1 MPa.
3. The composite lost circulation material of claim 1 or 2, wherein the temperature-sensitive expanded fine particles comprise one or more selected from the group consisting of epoxy resin, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene, and polyamide; and/or
The temperature-sensitive expansion fiber comprises one or more of epoxy resin, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorinated sulfonic acid ionic polymer, polyethylene, polyisoprene and polyamide; and/or
The microfine fibers comprise inorganic fibers and/or organic fibers, preferably the microfine fibers are selected from one or more of polyacrylamide, polypropylene, glass fibers, quartz glass fibers, boron fibers and ceramic fibers, more preferably the microfine fibers have a diameter of 100 μm and a length of 5-10 mm; and/or
The weighting agent is selected from one or more of slag, silicon powder, iron ore powder and barite, preferably, the slag is 50-100 meshes, the silicon powder is 80-200 meshes, the iron ore powder is 300-400 meshes, and the barite is 300-400 meshes.
4. A composite well cementation leaking stoppage spacer fluid system comprises water, temperature-sensitive expansion fine particles, temperature-sensitive expansion fibers, fine fibers and a weighting agent, preferably, the composite leaking stoppage material comprises the following components: 100 parts of water, 2-5 parts of temperature-sensitive expanded fine particles, 1-2 parts of temperature-sensitive expanded fibers, 0.2-1.5 parts of fine fibers and 50-150 parts of weighting agent.
5. The well cementation composite leakage stoppage spacer fluid system according to claim 4, wherein the temperature sensitive expansion fine particles are original state fine particles at 60-150 ℃, preferably 90-110 ℃, and are deformed state fine particles after being compressed; preferably, the original state fine particles are porous network structures or spheres; further preferably, the size of the original state fine particles is 10 to 20mm, and/or the size of the morphable fine particles is 10 to 350 mesh; and/or
The temperature-sensitive expansion fiber is an original fiber at 60-150 ℃, preferably 90-110 ℃, and is a deformed fiber after being compressed, preferably, the diameter of the original fiber is 5-400 μm, the length of the original fiber is 0.5-10cm, and/or the diameter of the deformed fiber is 5-400 μm, and the length of the deformed fiber is 5-10 mm; and/or
The temperature sensitive point of the deformation state fine particles is adjustable between 60 and 150 ℃, and/or
The temperature sensitive point of the deformed fiber is adjustable between 60 and 150 ℃;
preferably, the compression temperature is 0-20 ℃ and the pressure is 0.1 MPa.
6. A well cementation composite lost circulation spacer fluid system according to claim 4 or 5, wherein the temperature sensitive expanded fine particles comprise one or more selected from epoxy resin, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorosulfonic acid ionomer, polyethylene, polyisoprene and polyamide; and/or
The temperature-sensitive expansion fiber comprises one or more of epoxy resin, polystyrene, polycaprolactone, polyurethane, racemic polylactic acid, perfluorinated sulfonic acid ionic polymer, polyethylene, polyisoprene and polyamide; and/or
The microfine fibers comprise inorganic fibers and/or organic fibers, preferably the microfine fibers are selected from one or more of polyacrylamide, polypropylene, glass fibers, quartz glass fibers, boron fibers and ceramic fibers, more preferably the microfine fibers have a diameter of 100 μm and a length of 5-10 mm; and/or
The weighting agent is selected from one or more of slag, silicon powder, iron ore powder and barite, preferably, the slag is 50-100 meshes, the silicon powder is 80-200 meshes, the iron ore powder is 300-400 meshes, and the barite is 300-400 meshes.
7. The well cementation composite leakage blocking spacer fluid system according to any one of claims 4 to 6, wherein the well cementation cement slurry system further comprises other additives, wherein the other additives comprise at least one selected from a high temperature suspension stabilizer, a high temperature retarder and an antifoaming agent, preferably the other additives comprise 8 to 15 parts by weight of the high temperature suspension stabilizer, 0.5 to 3 parts by weight of the high temperature retarder and 0.2 to 1.5 parts by weight of the antifoaming agent.
8. The well cementing composite lost circulation spacer fluid system according to any one of claims 4 to 7, wherein the high temperature suspension stabilizer is selected from one or more of xanthan gum, guar gum, microsilica and bentonite; and/or
The high-temperature slow release agent is selected from one of hydroxycarboxylic acids, organic phosphates, inorganic acids and AA multipolymers; and/or
The defoaming agent is at least one selected from tributyl esters and organic silicone oil.
9. A method for preparing a well cementation composite leakage stoppage spacer fluid system according to any one of claims 4 to 8, comprising the following steps:
(1) mixing and stirring the temperature-sensitive expanded fine particles, the temperature-sensitive expanded fibers, the fine fibers and a weighting agent to obtain a solid mixture;
(2) stirring water and the other additives into a liquid mixture;
(3) and adding the solid mixture into the liquid mixture and stirring to obtain the well cementation cement slurry system.
10. Use of a cementing composite lost circulation spacer fluid system according to any one of claims 4 to 8 in natural fracture development, hole-type and fractured formation cementing.
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