CN106967398B - Oil well plugging fluid - Google Patents
Oil well plugging fluid Download PDFInfo
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- CN106967398B CN106967398B CN201710260236.2A CN201710260236A CN106967398B CN 106967398 B CN106967398 B CN 106967398B CN 201710260236 A CN201710260236 A CN 201710260236A CN 106967398 B CN106967398 B CN 106967398B
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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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- 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
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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Abstract
The invention provides an oil well leakage-stopping liquid. The oil well leakage-stopping liquid provided by the invention comprises the following components in parts by weight: 10-20 parts of rigid plugging material, 20-35 parts of flexible plugging material, 1-5 parts of composite fiber material, 0.5-5 parts of strength regulator, 0.1-0.5 part of tackifier, 0.5-5 parts of surfactant and 45-55 parts of water. The oil well leakage-blocking liquid provided by the invention has the advantages of simple formula, small viscosity and low apparent viscosity of 35mPa & s, is beneficial to field preparation and construction, and can effectively inhibit the invasion of stratum fluid; after the leakage layer is injected, high strength can be formed, the temperature resistance is strong, and the pressure bearing capacity can reach 12MPa at 150 ℃; the leakage problem of the lost-return leakage well is solved, the one-time plugging success rate can be improved, and the leakage amount is as low as 5%. The preparation method of the oil well plugging fluid provided by the invention is simple and convenient, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of oil-gas engineering, in particular to an oil well leakage plugging liquid.
Background
At present, the exploitation of most oil fields enters middle and late stages, and the pressure of an oil-gas layer is greatly changed due to long-term oil extraction and water injection. Part of oil layers are exhausted, and the fracture pressure is reduced; part of the oil layer is suppressed to high pressure due to water injection, and even exceeds the pressure of an overlying stratum; portions of the hydrocarbon reservoir may increase permeability due to new fractures created by the fractures. A plurality of sets of pressure layer systems are formed in an open hole section of the same well, and complex accidents such as blowout, well leakage, well collapse, drill sticking and the like are easily caused. The lost circulation is a process that drilling fluid leaks into caves, holes, cracks and high-porosity stratums from a well hole and is lost in a large amount or completely, and is one of underground complex conditions frequently encountered in the drilling process.
The Chinese invention patent (application number: 201310078662.6) discloses a petroleum engineering fiber composite pressure-bearing leakage-stopping liquid and a preparation method thereof, which reduces the dosage of a conventional LCM leakage-stopping material by 30 percent, has the leakage-stopping success rate of a fractured leak layer of carbonate rock of more than 75 percent and the pressure-bearing capacity of more than 10 MPa; the Chinese invention patent (application number: 201310739772.2) discloses a static gelling leakage-stopping liquid for stopping malignant leakage, which can effectively slow down the leakage speed and form a steep wall at the leakage hole, and the success rate of leakage stopping is higher than or equal to 85%; the Chinese invention patent (application number: 200810147851.3) discloses a lost-return leakage cross-linking gel plugging process, which can truly improve the overall structural strength of gel by chemical cross-linking and coagulation promotion, and improve the one-time plugging success rate to be more than 50 percent; the Chinese invention patent (application number: 201610036982.9) discloses a crack-type leakage stoppage formula for oil-based drilling fluid, wherein the addition of a leakage stoppage liquid is less than 7% for 1-5 mm cracks, and the compressive strength can reach 7 MPa.
However, the plugging materials have the problems of low strength and incapability of bearing higher temperature, and are easy to crush and deform in the use process, so that a bridging and plugging layer is difficult to form in the drilling crack plugging process.
Disclosure of Invention
The invention aims to provide an oil well leakage blocking liquid which is low in viscosity, high in strength after being injected into a leakage layer, high in temperature resistance, capable of improving the bearing capacity of a stratum and capable of solving the leakage problem of an lost-return leakage well.
The invention provides an oil well leakage plugging fluid which comprises the following components in parts by weight:
20-35 parts of a flexible plugging material;
10-20 parts of rigid plugging material;
1-5 parts of a composite fiber material;
0.5-5 parts of a strength regulator;
0.5-5 parts of a surfactant;
0.1-0.5 part of tackifier;
45-55 parts of water.
Preferably, the flexible plugging material comprises one or more of modified phenolic resin, aromatic hydrocarbon petroleum resin and rubber.
Preferably, the modified phenolic resin is obtained by copolymerization of phenolic resin and propylene oxide propylene ether.
Preferably, the rigid lost circulation material comprises one or more of calcium carbonate, silica, calcite, marble, and quartz sand.
Preferably, the rigid lost circulation material comprises calcium carbonate, silica and calcite.
Preferably, the composite fiber material includes two or three of carbon fiber, glass fiber and stainless steel fiber.
Preferably, the strength adjuster includes one or more of modified aromatic amine, dimethyl imidazole and tris- (dimethylaminomethyl) phenol.
Preferably, the modified aromatic amine is obtained by condensation reaction of raw materials including 2-ethyl-4-methylimidazole, diethyltoluenediamine, glycidyl ether, an initiator and water.
Preferably, the surfactant comprises one or more of polyoxyethylene octylphenol ether and polyoxyethylene sorbitan fatty acid ester.
Preferably, the tackifier comprises one or more of guar gum, xanthan gum and polyvinyl alcohol.
The invention provides an oil well leakage plugging fluid which comprises the following components in parts by weight: 20-35 parts of flexible plugging material, 10-20 parts of rigid plugging material, 1-5 parts of composite fiber material, 0.5-5 parts of strength regulator, 0.5-5 parts of surfactant, 0.1-0.5 part of tackifier and 45-55 parts of water. The oil well plugging fluid provided by the invention has the advantages of simple formula and low viscosity, is beneficial to field preparation and construction, and can effectively inhibit the invasion of stratum fluid; after the leak layer is injected, the high strength can be formed, the temperature resistance is strong, and the pressure bearing capacity of the stratum can be improved; the leakage problem of the lost-return leakage well is solved, and the success rate of primary leakage stoppage can be improved. The experimental result shows that the apparent viscosity of the oil well leakage-blocking liquid provided by the invention is as low as 35 mPa.s, the pressure-bearing capacity at 150 ℃ can reach 12MPa, and the leakage amount is as low as 5%.
Detailed Description
The invention provides an oil well leakage plugging fluid which comprises the following components in parts by weight: 20-35 parts of flexible plugging material, 10-20 parts of rigid plugging material, 1-5 parts of composite fiber material, 0.5-5 parts of strength regulator, 0.5-5 parts of surfactant, 0.1-0.5 part of tackifier and 45-55 parts of water.
The oil well leakage plugging liquid provided by the invention comprises 20-35 parts of flexible leakage plugging materials, preferably 25-30 parts. In the present invention, the flexible plugging material preferably comprises one or more of modified phenolic resin, aromatic petroleum resin and rubber.
In the present invention, the modified phenol resin is preferably obtained by copolymerization of a phenol resin and propylene oxide propylene ether. In the present invention, the modified phenolic resin is preferably prepared from raw materials including phenol, formaldehyde, water, concentrated sulfuric acid and propylene oxide propylene ether. In the invention, the raw materials preferably comprise the following components in parts by weight: 10-15 parts of phenol, 18-20 parts of formaldehyde, 20-35 parts of water, 0.1-0.5 part of concentrated sulfuric acid and 25-45 parts of propylene oxide propylene ether. In the invention, the mass concentration of the concentrated sulfuric acid is preferably 50-60%.
The preparation method of the modified phenolic resin is not particularly limited, and the technical scheme for preparing the modified phenolic resin, which is well known by the technical personnel in the field, can be adopted. In the present invention, the preparation of the modified phenolic resin preferably comprises the steps of:
(1) mixing phenol, water and concentrated sulfuric acid to obtain a mixed solution;
(2) heating the mixed solution obtained in the step (1), dripping formaldehyde, and performing polycondensation reaction to obtain phenolic resin;
(3) and (3) mixing the phenolic resin obtained in the step (2) with propylene oxide propylene ether, and carrying out copolymerization reaction to obtain the modified phenolic resin.
In the present invention, phenol, water and concentrated sulfuric acid are preferably mixed to obtain a mixed solution. The operation of the mixing is not particularly limited in the present invention, and a mixing technical scheme known to those skilled in the art may be adopted. In the present invention, the mixing is preferably performed under stirring conditions; the stirring speed is preferably 250-350 r/min, and more preferably 280-320 r/min; the stirring time is preferably 10-20 min, and more preferably 13-17 min.
After the mixed solution is obtained, the mixed solution is preferably heated, formaldehyde is dripped, and the phenolic resin is obtained through polycondensation reaction. In the invention, the heating rate is preferably 12-18 ℃/h, and more preferably 13-16 ℃/h. In the invention, the dripping speed is preferably 18-22 kg/h, and more preferably 19-21 kg/h. In the invention, the temperature of the polycondensation reaction is preferably 50-80 ℃, more preferably 60-70 ℃, and most preferably 63-68 ℃; the time of the polycondensation reaction is preferably 4-5 h.
After the phenolic resin is obtained, the phenolic resin and propylene oxide propylene ether are preferably mixed and subjected to copolymerization reaction to obtain the modified phenolic resin. In the invention, the temperature of the copolymerization reaction is preferably 60-70 ℃, and more preferably 64-66 ℃; the time of the copolymerization reaction is preferably 4-5 h.
In the invention, the flexible plugging material has certain toughness and deformability, and can fill pores formed by bridging of the rigid plugging material, thereby reducing the leakage of drilling fluid.
The oil well leakage blocking liquid provided by the invention comprises 10-20 parts of rigid leakage blocking materials, preferably 14-16 parts. In the present invention, the rigid lost circulation material includes one or more of calcium carbonate, silica, calcite, marble, and quartz sand, and preferably includes calcium carbonate, silica, and calcite. In the invention, when the rigid plugging material is calcium carbonate, silicon dioxide and calcite, the mass ratio of the calcium carbonate to the silicon dioxide to the calcite is preferably (1-3): 1-4): 1-3, and more preferably (1.5-2.5): 2-3): 1.5-2.5. In the invention, the particle size of the calcium carbonate is preferably 60-80 meshes; the particle size of the silicon dioxide is preferably 100-200 meshes, and more preferably 120-160 meshes; the particle size of the calcite is preferably 40-60 meshes. In the invention, the rigid plugging material adopts a large-particle bridging and small-particle filling mode, so that the plugging strength is improved.
The oil well leakage plugging liquid provided by the invention comprises 1-5 parts of composite fiber material, preferably 3-4 parts. In the present invention, the composite fiber material preferably includes two or three of carbon fiber, glass fiber and stainless steel fiber, and more preferably includes carbon fiber and glass fiber. In the invention, when the composite fiber material comprises carbon fibers and glass fibers, the mass ratio of the carbon fibers to the glass fibers is preferably 1-2: 1. In the invention, the length of the composite fiber material is preferably 2-4 mm; the diameter of the composite fiber material is preferably 0.01-0.03 mm.
The oil well leakage-blocking liquid provided by the invention comprises 0.5-5 parts of strength regulator, preferably 2-4 parts. In the present invention, the strength adjuster preferably includes one or more of modified aromatic amine, dimethyl imidazole, and tris- (dimethylaminomethyl) phenol.
In the present invention, the modified aromatic amine is preferably obtained by condensation reaction of raw materials including 2-ethyl-4-methylimidazole, diethyltoluenediamine, glycidyl ether, an initiator and water. In the invention, the raw materials preferably comprise the following components in parts by weight: 20-25 parts of 2-ethyl-4-methylimidazole, 10-20 parts of diethyltoluenediamine, 25-35 parts of glycidyl ether, 1-2 parts of an initiator and 20-45 parts of water. The kind of the initiator is not particularly limited in the present invention, and any initiator known to those skilled in the art may be used. In the present invention, the initiator is preferably one or more of potassium persulfate, azobisisobutyronitrile, and azobisisoheptonitrile.
The method for preparing the modified aromatic amine is not particularly limited in the present invention, and the technical scheme for preparing the modified aromatic amine known to those skilled in the art can be adopted. In the present invention, the modified aromatic amine is preferably prepared by mixing 2-ethyl-4-methylimidazole, diethyltoluenediamine, glycidyl ether, an initiator and water, and performing a condensation reaction. In the invention, the condensation reaction temperature is preferably 50-80 ℃, and more preferably 60-70 ℃; the time of the condensation reaction is preferably 5-10 h, and more preferably 6-8 h.
In order to separate the reaction product from water, it is preferable in the present invention that the modified aromatic amine is obtained by centrifugal separation after the condensation reaction is completed. The operation of the centrifugal separation in the present invention is not particularly limited, and a centrifugal separation technique known to those skilled in the art may be employed. In the invention, the speed of centrifugal separation is preferably 4500-5500 r/min, more preferably 4800-5200 r/min; the time for centrifugal separation is preferably 5-15 min, and more preferably 8-12 min.
In the invention, the strength regulator can perform a crosslinking reaction with the flexible plugging material, so that the strength and the toughness are improved.
The oil well leakage blocking liquid provided by the invention comprises 0.5-5 parts of surfactant, preferably 2-4 parts. In the present invention, the surfactant includes one or more of polyoxyethylene octylphenol ether and polyoxyethylene sorbitan fatty acid ester. In the present invention, the octylphenol polyoxyethylene ether is preferably OP-10 and/or OP-20. In the present invention, the polyoxyethylene sorbitan fatty acid ester is preferably tween 80.
The oil well leakage-blocking liquid provided by the invention comprises 0.1-0.5 part of tackifier, preferably 0.2-0.3 part. In the present invention, the tackifier preferably includes one or more of guar gum, xanthan gum, and polyvinyl alcohol.
The method for preparing the oil well plugging fluid is not particularly limited, and the method for preparing the composition, which is well known to those skilled in the art, can be adopted. In the invention, the preparation method of the oil well plugging fluid is preferably as follows: firstly, mixing water, a tackifier and a surfactant to obtain mixed slurry; and mixing the mixed slurry with a rigid plugging material, a flexible plugging material, a composite fiber material and a strength regulator to obtain the oil well plugging fluid.
For further illustration of the invention, the oil well plugging fluids provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the invention.
Example 1:
mixing 45 parts by weight of water, 0.5 part by weight of guanidine gum and 5 parts by weight of OP-10 to obtain mixed slurry;
and mixing the mixed slurry with 10 parts by weight of rigid plugging material, 35 parts by weight of flexible plugging material, 1 part by weight of composite fiber material and 3 parts by weight of strength adjusting material to obtain the oil well plugging fluid.
The rigid plugging material is formed by combining calcium carbonate, silicon dioxide and calcite according to the following proportion:
30 parts by weight of calcium carbonate
10 parts by weight of silica
Calcite 30 parts by weight
The particle size of the calcium carbonate is 60 meshes, the particle size of the silicon dioxide is 100 meshes, and the particle size of the calcite is 40 meshes.
The flexible plugging material is prepared according to the following scheme: adding 10 parts by weight of phenol and 20 parts by weight of water into a reaction kettle, stirring for 15min at the speed of 300r/min, adding 0.1 part by weight of concentrated sulfuric acid with the mass concentration of 50%, heating to 80 ℃ at the speed of 15 ℃/h, dropwise adding 20 parts by weight of formaldehyde at the dropping speed of 20kg/h, reacting for 5 hours at 80 ℃, adding 45 parts by weight of propylene oxide propylene ether, and continuing to react for 5 hours; standing, naturally cooling to room temperature, and filtering to obtain the flexible plugging material.
The composite fiber material is formed by combining carbon fibers and glass fibers according to the weight ratio of 1: 1.
The strength regulator is prepared according to the following scheme: 20 parts by weight of 2-ethyl-4-methylimidazole, 10 parts by weight of diethyltoluenediamine, 25 parts by weight of glycidyl ether, 1 part by weight of initiator and 20 parts by weight of deionized water are proportionally added into a closed reaction kettle, the reaction is carried out for 10 hours at 80 ℃, the reaction is naturally cooled after the reaction is completed, and the centrifugal dehydration treatment is carried out for 10 minutes at the speed of 5000r/min, so that the strength regulator is obtained.
Example 2:
mixing 0.3 part by weight of xanthan gum, 2 parts by weight of OP-20 and 45 parts by weight of water to obtain mixed slurry;
and (3) mixing the mixed slurry with 20 parts by weight of rigid plugging material, 25 parts by weight of flexible plugging material, 1 part by weight of composite fiber material and 3 parts by weight of strength adjustment to obtain the oil well plugging fluid.
The rigid plugging material is formed by combining calcium carbonate, silicon dioxide and calcite according to the following proportion:
10 parts by weight of calcium carbonate
Silicon dioxide 30 parts by weight
10 parts by weight of calcite, and the like,
the particle size of the calcium carbonate is 70 meshes, the particle size of the silicon dioxide is 150 meshes, and the particle size of the calcite is 50 meshes.
The flexible plugging material is prepared according to the following scheme: adding 15 parts by weight of phenol and 25 parts by weight of water into a reaction kettle, stirring for 15min at the speed of 300r/min, adding 0.1 part by weight of concentrated sulfuric acid with the mass concentration of 50%, heating to 80 ℃ at the speed of 15 ℃/h, dropwise adding 15 parts by weight of formaldehyde at the dropping speed of 20kg/h, reacting for 5 hours at 80 ℃ after the addition is finished, adding 45 parts by weight of propylene oxide propylene ether, and continuing to react for 5 hours; standing, naturally cooling to room temperature, and filtering to obtain the flexible plugging material.
The composite fiber material is formed by combining carbon fibers and glass fibers according to the weight ratio of 2: 1.
The strength regulator is prepared according to the following scheme: 22 parts by weight of 2-ethyl-4-methylimidazole, 15 parts by weight of diethyltoluenediamine, 25 parts by weight of glycidyl ether, 1 part by weight of initiator and 20 parts by weight of deionized water are proportionally added into a closed reaction kettle, the reaction is carried out for 8 hours at 80 ℃, the reaction is naturally cooled after the reaction is completed, and the centrifugal dehydration treatment is carried out for 10 minutes at the speed of 5000r/min, so that the strength regulator is obtained.
Example 3:
mixing 0.5 part by weight of polyvinyl alcohol, 3 parts by weight of tween 80 and 45 parts by weight of water to obtain mixed slurry;
and mixing the mixed slurry with 15 parts by weight of rigid plugging material, 30 parts by weight of flexible plugging material, 2 parts by weight of composite fiber material and 4 parts by weight of strength adjustment to obtain the oil well plugging fluid.
The rigid plugging material is formed by combining calcium carbonate, silicon dioxide and calcite according to the following proportion:
10 parts by weight of calcium carbonate
Silicon dioxide 30 parts by weight
10 parts by weight of calcite, and the like,
the particle size of the calcium carbonate is 70 meshes, the particle size of the silicon dioxide is 150 meshes, and the particle size of the calcite is 50 meshes.
The flexible plugging material is prepared according to the following scheme: adding 15 parts by weight of phenol and 25 parts by weight of water into a reaction kettle, stirring for 15min at the speed of 300r/min, adding 0.1 part by weight of concentrated sulfuric acid with the mass concentration of 50%, heating to 80 ℃ at the speed of 15 ℃/h, dropwise adding 15 parts by weight of formaldehyde at the dropping speed of 20kg/h, reacting for 5 hours at 80 ℃ after the addition is finished, adding 45 parts by weight of propylene oxide propylene ether, and continuing to react for 5 hours; standing, naturally cooling to room temperature, and filtering to obtain the flexible plugging material.
The composite fiber material is formed by combining carbon fibers and glass fibers according to the weight ratio of 2: 1.
The strength regulator is prepared according to the following scheme: 22 parts by weight of 2-ethyl-4-methylimidazole, 15 parts by weight of diethyltoluenediamine, 25 parts by weight of glycidyl ether, 1 part by weight of initiator and 20 parts by weight of deionized water are proportionally added into a closed reaction kettle, the reaction is carried out for 8 hours at 80 ℃, the reaction is naturally cooled after the reaction is completed, and the centrifugal dehydration treatment is carried out for 10 minutes at the speed of 5000r/min, so that the strength regulator is obtained.
Rheological property tests were performed on the oil well plugging fluids prepared in examples 1 to 3 of the present invention, and the test results are shown in table 1.
The pressure-bearing capacity of the oil well plugging liquid prepared in the embodiment 1-3 of the invention is tested, and 2000mL of the plugging liquid is tested under the cracks of 2mm, 5mm and 10mm respectively, and the results are respectively shown in tables 2-4.
TABLE 1 rheological Properties of the oil well plugging fluids prepared in the examples of the present invention
| Examples | Apparent viscosity AV (mPa. s) | Plastic viscosity PV (mPa. s) | Dynamic cutting force YP (Pa) |
| 1 | 35 | 27 | 8 |
| 2 | 39 | 28 | 11 |
| 3 | 36 | 26 | 10 |
Table 2 test results of pressure-bearing capacity of the oil well plugging fluid prepared in the embodiment of the present invention at a crack width of 2mm
| Examples | Test temperature (. degree. C.) | Leakage (mL) | Bearing capacity (MPa) | Leakage stopping effect |
| 1 | 150 | 100 | 12 | Plugging up |
| 2 | 150 | 150 | 10 | Plugging up |
| 3 | 150 | 120 | 11 | Plugging up |
TABLE 3 test results of pressure-bearing capacity of oil well plugging fluid prepared by the embodiment of the invention at 5mm crack width
| Examples | Test temperature (. degree. C.) | Leakage (mL) | Bearing capacity (MPa) | Leakage stopping effect |
| 1 | 130 | 240 | 10 | Plugging up |
| 2 | 125 | 220 | 9.5 | Plugging up |
| 3 | 140 | 250 | 10.5 | Plugging up |
TABLE 4 test results of pressure-bearing capacity of oil well plugging fluid prepared by the embodiment of the invention at 10mm crack width
| Examples | Test temperature (. degree. C.) | Leakage (mL) | Bearing capacity (MPa) | Leakage stopping effect |
| 1 | 130 | 360 | 9 | Plugging up |
| 2 | 130 | 450 | 9.5 | Plugging up |
| 3 | 140 | 420 | 8.8 | Plugging up |
The oil well leakage plugging fluid provided by the invention has the advantages of simple formula, low viscosity, contribution to field preparation and construction and capability of effectively inhibiting the invasion of stratum fluid; after the leak layer is injected, the high strength can be formed, the temperature resistance is strong, and the pressure bearing capacity of the stratum can be improved; the leakage problem of the lost-return leakage well is solved, and the success rate of primary leakage stoppage can be improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. The oil well leakage-stopping liquid consists of the following components in parts by weight:
20-35 parts of a flexible plugging material;
10-20 parts of rigid plugging material;
1-5 parts of a composite fiber material;
0.5-5 parts of a strength regulator;
0.5-5 parts of a surfactant;
0.1-0.5 part of tackifier;
45-55 parts of water;
the flexible plugging material comprises one or more of modified phenolic resin, aromatic hydrocarbon petroleum resin and rubber;
the modified phenolic resin is obtained by copolymerization reaction of phenolic resin and propylene oxide propylene ether;
the rigid plugging material comprises one or more of calcium carbonate, silicon dioxide, calcite, marble and quartz sand;
the strength regulator is modified aromatic amine;
the modified aromatic amine is obtained by condensation reaction after mixing 2-ethyl-4-methylimidazole, diethyl toluenediamine, glycidyl ether, an initiator and water.
2. The oil well plugging fluid of claim 1, wherein said rigid plugging material comprises calcium carbonate, silica and calcite.
3. The oil well plugging fluid of claim 1, wherein said composite fiber material comprises two or three of carbon fiber, glass fiber and stainless steel fiber.
4. The oil well plugging fluid of claim 1, wherein said surfactant comprises one or more of an octylphenol polyoxyethylene ether and a polyoxyethylene sorbitan fatty acid ester.
5. The oil well plugging fluid of claim 1, wherein said viscosifying agent comprises one or more of guar gum, xanthan gum, and polyvinyl alcohol.
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| CN108300434B (en) * | 2018-04-04 | 2019-02-22 | 北京科麦仕油田化学剂技术有限公司 | A kind of high density oil base drilling fluid leakage-stop liquid and the preparation method and application thereof |
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| CN112980408B (en) * | 2019-12-13 | 2023-09-19 | 中国石油化工股份有限公司 | High-pressure saline layer crack type leakage plugging agent and preparation method and application thereof |
| CN112592703B (en) * | 2020-12-16 | 2022-10-21 | 湖南科技大学 | Elastic cementing breathable material for preventing and treating instability of hole wall of drilled hole and preparation method thereof |
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Denomination of invention: A type of oil well plugging fluid Effective date of registration: 20230530 Granted publication date: 20201120 Pledgee: Bank of China Limited Jingzhou Branch Pledgor: JINGZHOU JIAHUA TECHNOLOGY Co.,Ltd. Registration number: Y2023420000213 |