CN116023086A - Thermosetting resin gel plugging composition and preparation method thereof - Google Patents
Thermosetting resin gel plugging composition and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of drilling fluid plugging, in particular to a thermosetting resin gel plugging composition and a preparation method thereof, wherein the thermosetting resin gel plugging composition comprises G-level cement, silica fume, floating beads, a fluid loss agent, a dispersing agent, thermosetting resin, a gel plugging agent, a coagulant, mixed fibers and water, and is prepared according to the following method: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, filtrate reducer and water to obtain mixed liquid, and pouring the mixed powder into the mixed liquid to uniformly stir to obtain the composite material. The thermosetting resin gel plugging composition has adjustable thickening time, initial solidification time after 4-6 hours of mixed materials, can complete solidification within 24 hours, has adjustable density, and has compressive strength and elastic modulus performance meeting drilling requirements.
Description
Technical Field
The invention relates to the technical field of drilling fluid plugging, in particular to a thermosetting resin gel plugging composition and a preparation method thereof.
Background
In the petroleum drilling construction process, the existence of pores, cracks or karst cave in the rock of the underground stratum makes the drilling fluid flow in the underground stratum. When the pore pressure of the underground stratum is smaller than the column pressure of the drilling fluid, the drilling fluid can enter the stratum to leak under the action of positive pressure difference; when the formation fracture pressure is less than the liquid column pressure of the drilling fluid, the formation is fractured, and larger leakage occurs. In addition, when the old oil field drills an adjusting well and an encrypting well, the pressure of a production layer is reduced due to long-term exploitation of the oil field, the stratum is further broken after the fracturing operation, and lost circulation is more likely to occur when the drilling well meets the stratum. When well drilling is lost, conventional (cotton seed hulls and crude fibers) plugging drilling fluid is generally prepared for plugging, but most of the effects are not obvious, and larger and more complex occurrence is easy to cause. The well leakage can cause the pause or interruption of drilling work, and the serious leakage can lead to the failure of long production time, and consume a great deal of manpower, material resources and financial resources. The well drilling lost circulation can not be treated in time, and well drilling collapse, blowout and drill sticking accidents can be caused, so that the prevention and the timely treatment of the lost circulation are very important work in the well drilling process.
In the field of petroleum drilling, a section of resin pipe is formed at an unstable position of a well wall in a well during plugging by utilizing the high strength characteristic of a gel composition mainly comprising thermosetting resin and a gel plugging agent after solidification, so that the temporary casing is realized. The thermosetting resin gel plugging composition system used in the process needs to be mixed at the surface, then pumped to the corresponding position in the well through a drill rod, and cured after being pumped to the response position. However, the existing thermosetting resin has a high curing speed, the phenomenon of thickening and solidification generally occurs 30min to 1h after mixing, and the drill rod generally needs 4 hours to 6 hours of operation time for pumping the thermosetting resin gel system to the underground response position, which results in the fact that the thermosetting resin does not reach the target position and begins to solidify in the pumping process, and the final solidification effect is affected.
Disclosure of Invention
The invention provides a thermosetting resin gel plugging composition and a preparation method thereof, which overcome the defects of the prior art, the thickening time is adjustable, the initial solidification time is after 4 to 6 hours of mixed materials, solidification can be completed within 24 hours, the density is adjustable, and the compression strength and the elastic modulus performance meet the drilling requirements.
One of the technical schemes of the invention is realized by the following measures: the thermosetting resin gel plugging composition is prepared from 200 parts of G-grade cement, 20 to 25 parts of silica fume, 30 to 40 parts of floating beads, 2 to 3 parts of fluid loss agent, 2.0 to 2.5 parts of dispersing agent, 25 to 30 parts of thermosetting resin, 20 to 30 parts of gel plugging agent, 2 parts of coagulant, 0.2 part of mixed fiber and 100 to 120 parts of water according to the weight parts, and is prepared by the following steps: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, fluid loss agent and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid, and uniformly stirring to obtain the thermosetting resin gel plugging composition.
The following are further optimizations and/or improvements to one of the above-described inventive solutions:
the G-grade cement is sulfur-resistant silicate cement in the G grade of an oil well.
The thermosetting resin is prepared from epoxy resin and organic silicon resin according to the weight ratio of 10 to 15:1 are compounded.
The water loss reducing agent is terpolymer water loss reducing agent, and the terpolymer water loss reducing agent is 2-acrylamido-2-methylpropanesulfonic Acid (AMPS).
The gel plugging agent is prepared by compounding, by weight, 4-8% of sodium polyacrylate, 15-25% of cotton threads, 0.05-0.10% of ammonium persulfate, 1-5% of methacryloyloxyethyl trimethyl ammonium chloride, 15-25% of wood powder and the balance of acrylamide.
The coagulant is compounded with 5-15 wt% calcium chloride, 5-10 wt% calcium aluminate and water.
The mixed fiber is compounded by 45 to 55 weight percent of carbon fiber, 20 to 30 weight percent of polypropylene fiber and the balance of polyester fiber.
The grain size of the micro silicon powder is 300 meshes, the average grain size is 0.1 mu m to 0.3 mu m, the floating bead grain size is 5 mu m to 30 mu m, and the surface area is 150 mu m 2 /g to 200m 2 /g。
The stirring speed is 150r/min to 300r/min.
The second technical scheme of the invention is realized by the following measures: the preparation method of the thermosetting resin gel plugging composition comprises the following raw materials, by weight, 200 parts of G-grade cement, 20 to 25 parts of silica fume, 30 to 40 parts of floating beads, 2 to 3 parts of fluid loss agent, 2.0 to 2.5 parts of dispersing agent, 25 to 30 parts of thermosetting resin, 20 to 30 parts of gel plugging agent, 2 parts of coagulant, 0.2 part of mixed fiber and 100 to 120 parts of water, and the preparation method is as follows: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, fluid loss agent and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid, and uniformly stirring to obtain the thermosetting resin gel plugging composition.
The following is a further optimization and/or improvement of the second technical scheme of the invention:
the G-grade cement is sulfur-resistant silicate cement in the G grade of an oil well.
The thermosetting resin is prepared from epoxy resin and organic silicon resin according to the weight ratio of 10 to 15:1 are compounded.
The water loss reducing agent is terpolymer water loss reducing agent, and the terpolymer water loss reducing agent is 2-acrylamido-2-methylpropanesulfonic Acid (AMPS).
The gel plugging agent is prepared by compounding, by weight, 4-8% of sodium polyacrylate, 15-25% of cotton threads, 0.05-0.10% of ammonium persulfate, 1-5% of methacryloyloxyethyl trimethyl ammonium chloride, 15-25% of wood powder and the balance of acrylamide.
The coagulant is compounded with 5-15 wt% calcium chloride, 5-10 wt% calcium aluminate and water.
The mixed fiber is compounded by 45 to 55 weight percent of carbon fiber, 20 to 30 weight percent of polypropylene fiber and the balance of polyester fiber.
The grain size of the micro silicon powder is 300 meshes, the average grain size is 0.1 mu m to 0.3 mu m, the floating bead grain size is 5 mu m to 30 mu m, and the surface area is 150 mu m 2 /g to 200m 2 /g。
The stirring speed is 150r/min to 300r/min.
The invention has the beneficial effects that:
compared with the prior art, the thermosetting resin gel plugging composition has adjustable thickening time, the initial solidification time is 4 to 6 hours after being mixed, the solidification can be completed within 24 hours, and the density is 1.4g/cm 3 To 1.5g/cm 3 The pressure resistance of the consolidated body can reach 22MPa/48h, the elastic modulus can reach 8.47GPa, and the drilling requirement is met.
The thermosetting resin gel plugging composition utilizes the high strength property of the G-level cement and the thermosetting resin after solidification, the plugging property of the gel plugging agent, the coagulation accelerating effect of the coagulant at low temperature (below 50 ℃), the lightening effect of the floating beads, the water loss reducing effect of the fluid loss agent and the micro silicon powder which can keep the slurry stable, and after being uniformly mixed with water according to an optimized proportion, the initial solidification time of the thermosetting resin gel plugging composition is kept between 4 and 6 hours, the density is controllable, the slurry stability is excellent, and the compressive strength and the elastic modulus of the consolidated body all meet the downhole drilling requirements.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention. The chemical reagents and chemical products mentioned in the invention are all commonly used chemical reagents and chemical products known in the prior art unless otherwise specified, and the percentages in the invention are all mass percentages unless otherwise specified.
The invention is further described below with reference to examples:
example 1: the thermosetting resin gel plugging composition comprises, by weight, 200 parts of G-grade cement, 20 to 25 parts of silica fume, 30 to 40 parts of floating beads, 2 to 3 parts of fluid loss agent, 2.0 to 2.5 parts of dispersing agent, 25 to 30 parts of thermosetting resin, 20 to 30 parts of gel plugging agent, 2 parts of coagulant, 0.2 part of mixed fiber and 100 to 120 parts of water, and is prepared by the following steps: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, fluid loss agent and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid, and uniformly stirring to obtain the thermosetting resin gel plugging composition.
The G-grade cement is sulfur-resistant silicate cement in the G grade of an oil well.
The thermosetting resin is prepared from epoxy resin and organic silicon resin according to the weight ratio of 10 to 15:1 are compounded.
The water loss reducing agent is terpolymer water loss reducing agent, and the terpolymer water loss reducing agent is 2-acrylamido-2-methylpropanesulfonic Acid (AMPS).
The gel plugging agent is prepared by compounding, by weight, 4-8% of sodium polyacrylate, 15-25% of cotton threads, 0.05-0.10% of ammonium persulfate, 1-5% of methacryloyloxyethyl trimethyl ammonium chloride, 15-25% of wood powder and the balance of acrylamide.
The coagulant is compounded with 5-15 wt% calcium chloride, 5-10 wt% calcium aluminate and water.
The mixed fiber is compounded by 45 to 55 weight percent of carbon fiber, 20 to 30 weight percent of polypropylene fiber and the balance of polyester fiber.
The grain size of the micro silicon powder is 300 meshes, the average grain size is 0.1 mu m to 0.3 mu m, the floating bead grain size is 5 mu m to 30 mu m, and the surface area is 150 mu m 2 /g to 200m 2 /g。
The stirring speed is 150r/min to 300r/min.
In the invention, the raw material dispersing agent is a graft copolymer made of allyl ether ester monomer, and the dispersing agent adopted in the invention is a cement dispersing agent obtained by a preparation method of cement dispersing agent in China patent application No. 200610005049.1 and patent name of cement dispersing agent.
Example 2: the thermosetting resin gel plugging composition is prepared from the following raw materials in parts by weight: uniformly stirring required amounts of sulfur-resistant silicate cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid at a stirring speed of 150r/min to 300r/min, uniformly stirring to obtain the thermosetting resin gel plugging composition,
the thermosetting resin comprises epoxy resin and organic silicon resin according to the weight ratio of 10:1, compounding;
the gel plugging agent is prepared by compounding, by weight, 4% of sodium polyacrylate, 15% of cotton threads, 0.05% of ammonium persulfate, 1% of methacryloyloxyethyl trimethyl ammonium chloride, 15% of wood flour and the balance of acrylamide;
the coagulant is compounded by 5 weight percent of calcium chloride, 5 weight percent of calcium aluminate and the balance of water;
the mixed fiber is formed by compounding 45 weight percent of carbon fiber, 20 weight percent of polypropylene fiber and the balance of polyester fiber;
the granularity of the micro silicon powder is 300 meshes, and the average grain diameter0.1 μm, a floating bead particle diameter of 5 μm and a surface area of 150 μm 2 /g; the stirring speed was 150r/min.
Example 3: the thermosetting resin gel plugging composition is prepared from 200 parts of sulfur-resistant silicate cement, 20 parts of silica fume, 35 parts of floating beads, 2.5 parts of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS), 2.5 parts of dispersing agent, 30 parts of thermosetting resin, 25 parts of gel plugging agent, 2 parts of coagulant, 0.2 part of mixed fiber and 110 parts of water according to the following method: uniformly stirring required amounts of sulfur-resistant silicate cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid at a stirring speed of 150r/min to 300r/min, uniformly stirring to obtain the thermosetting resin gel plugging composition,
the thermosetting resin is prepared from epoxy resin and organic silicon resin according to the weight ratio of 12:1, compounding;
the gel plugging agent is prepared by compounding 6% of sodium polyacrylate, 20% of cotton thread, 0.08% of ammonium persulfate, 2% of methacryloyloxyethyl trimethyl ammonium chloride, 20% of wood flour and the balance of acrylamide in percentage by weight;
the coagulant is compounded by 10 weight percent of calcium chloride, 8 weight percent of calcium aluminate and the balance of water;
the mixed fiber is formed by compounding 50 weight percent of carbon fiber, 25 weight percent of polypropylene fiber and the balance of polyester fiber;
the granularity of the micro silicon powder is 300 meshes, the average grain diameter is 0.2 mu m, the grain diameter of the floating beads is 15 mu m, and the surface area is 150m 2 /g; the stirring speed was 200r/min.
Example 4: the thermosetting resin gel plugging composition is prepared from the following raw materials in parts by weight: uniformly stirring required amounts of sulfur-resistant silicate cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid at a stirring speed of 150r/min to 300r/min, uniformly stirring to obtain the thermosetting resin gel plugging composition,
the thermosetting resin comprises epoxy resin and organic silicon resin according to the weight ratio of 15:1, compounding;
the gel plugging agent is prepared by compounding 8% of sodium polyacrylate, 25% of cotton thread, 0.10% of ammonium persulfate, 5% of methacryloyloxyethyl trimethyl ammonium chloride, 25% of wood flour and the balance of acrylamide;
the coagulant is compounded by 15 percent of calcium chloride, 10 percent of calcium aluminate and the balance of water in percentage by weight;
the mixed fiber is formed by compounding 55 weight percent of carbon fiber, 30 weight percent of polypropylene fiber and the balance of polyester fiber;
the granularity of the micro silicon powder is 300 meshes, the average grain diameter is 0.3 mu m, the grain diameter of the floating beads is 30 mu m, and the surface area is 200m 2 /g; the stirring speed was 300r/min.
The thermosetting resin gel plugging composition obtained in the embodiment 2 to the embodiment 4 of the invention has adjustable thickening time, the initial solidification time is 4 to 6 hours after being mixed, solidification can be completed within 24 hours, the density is adjustable, the performance meets the drilling requirement, and the following is the performance test of the thermosetting resin gel plugging composition.
The test method comprises the following steps: the thermosetting resin gel plugging compositions obtained in examples 2 to 4 of the present invention were subjected to performance tests, the performance test items comprising a thickening time, a strength test and a comprehensive performance test, wherein the strength test comprises a compressive strength (MPa), a flexural strength (MPa) and a cohesive strength (MPa), the comprehensive performance test comprises a thickening start time (min) in an environment of 80 ℃, a curing end time (h) in an environment of 80 ℃, a consolidated body compressive strength (MPa/48 h), an elastic modulus (GPa) and a density (g/cm) 3 ) Methods specified in the respective Performance tests with reference to GB/T19139-2003 method for testing oil well CementIs carried out.
Test results: the thickening time test results are shown in tables 1 to 3, wherein table 1 is the thickening time after adding retarder to the thermosetting resin gel plugging composition obtained in example 2 of the present invention, table 2 is the thickening time after adding retarder to the thermosetting resin gel plugging composition obtained in example 3 of the present invention, the thickening time after adding retarder to the thermosetting resin gel plugging composition obtained in example 4 of the present invention, the retarder is the retarder of model TW302 or GH-9 manufactured by Tianjin Walder chemical Co., ltd., strength test results are shown in table 4, the comprehensive performance test results are shown in table 5, and it is clear from tables 1 to 5 that the thermosetting resin gel plugging composition of the present invention has a density of 1.4g/cm 3 To 1.5g/cm 3 The initial setting time is adjustable, after 4 to 6 hours of the mixed composition is mixed, the thermosetting resin gel plugging composition is pumped to a corresponding position in the well through a drill rod after the mixed composition is fully mixed by operators, and the thermosetting resin gel plugging composition is solidified after reaching a target position, can be solidified within 24 hours, has the compressive strength of 22MPa/48 hours, has the elastic modulus of 8.47GPa, has the compressive strength and elastic modulus performance meeting the drilling requirements, and can be popularized and used.
In summary, the thickening time of the thermosetting resin gel plugging composition is adjustable, the initial solidification time is 4 to 6 hours after the thermosetting resin gel plugging composition is well mixed, solidification can be completed within 24 hours, the density is adjustable, and the compressive strength and the elastic modulus performance meet the drilling requirements.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (9)
1. The thermosetting resin gel plugging composition is characterized by comprising 200 parts of G-grade cement, 20 to 25 parts of silica fume, 30 to 40 parts of floating beads, 2 to 3 parts of fluid loss agent, 2.0 to 2.5 parts of dispersing agent, 25 to 30 parts of thermosetting resin, 20 to 30 parts of gel plugging agent, 2 parts of coagulant, 0.2 part of mixed fiber and 100 to 120 parts of water according to the weight parts, and is prepared by the following steps: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, fluid loss agent and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid, and uniformly stirring to obtain the thermosetting resin gel plugging composition.
2. The thermosetting resin gel plugging composition according to claim 1, wherein the class G cement is a sulfur resistant portland cement in class G of oil well; or/and, the thermosetting resin is prepared from epoxy resin and organic silicon resin according to the weight ratio of 10 to 15:1 are compounded.
3. The thermosetting resin gel plugging composition according to claim 1 or 2, wherein the fluid loss agent is a terpolymer fluid loss agent, and the terpolymer fluid loss agent is 2-acrylamido-2-methylpropanesulfonic acid; or/and, the gel plugging agent is compounded by 4 to 8 weight percent of sodium polyacrylate, 15 to 25 weight percent of cotton thread, 0.05 to 0.10 weight percent of ammonium persulfate, 1 to 5 weight percent of methacryloyloxyethyl trimethyl ammonium chloride, 15 to 25 weight percent of wood powder and the balance of acrylamide.
4. The thermosetting resin gel plugging composition according to claim 1 or 2, wherein the coagulant is compounded from 5 to 15% by weight of calcium chloride, 5 to 10% by weight of calcium aluminate and the balance of water; or/and the mixed fiber is compounded by 45 to 55 weight percent of carbon fiber, 20 to 30 weight percent of polypropylene fiber and the balance of polyester fiber.
5. The thermosetting resin gel plugging composition according to claim 3, wherein the coagulant is compounded from 5 to 15% by weight of calcium chloride, 5 to 10% by weight of calcium aluminate and the balance of water; or/and the mixed fiber is compounded by 45 to 55 weight percent of carbon fiber, 20 to 30 weight percent of polypropylene fiber and the balance of polyester fiber.
6. The thermosetting resin gel plugging composition according to claim 1, 2 or 5, wherein the silica fume has a particle size of 300 mesh, an average particle diameter of 0.1 μm to 0.3 μm, a floating bead particle diameter of 5 μm to 30 μm, and a surface area of 150m 2 /g to 200m 2 /g; or/and the stirring speed is 150r/min to 300r/min.
7. A thermosetting resin gel plugging composition according to claim 3 wherein the microsilica has a particle size of 300 mesh, an average particle size of 0.1 μm to 0.3 μm, a floating bead size of 5 μm to 30 μm and a surface area of 150m 2 /g to 200m 2 /g; or/and the stirring speed is 150r/min to 300r/min.
8. The thermosetting resin gel plugging composition according to claim 4, wherein the silica fume has a particle size of 300 meshes, an average particle diameter of 0.1 μm to 0.3 μm, a floating bead particle diameter of 5 μm to 30 μm, and a surface area of 150m 2 /g to 200m 2 /g; or/and the stirring speed is 150r/min to 300r/min.
9. A method for preparing the thermosetting resin gel plugging composition according to any one of claims 2 to 8, which is characterized in that the raw materials comprise 200 parts by weight of class G cement, 20 to 25 parts by weight of silica fume, 30 to 40 parts by weight of floating beads, 2 to 3 parts by weight of fluid loss additive, 2.0 to 2.5 parts by weight of dispersing agent, 25 to 30 parts by weight of thermosetting resin, 20 to 30 parts by weight of gel plugging agent, 2 parts by weight of coagulant, 0.2 parts by weight of mixed fiber and 100 to 120 parts by weight of water, and the method is as follows: uniformly stirring required amounts of G-grade cement, silica fume, floating beads, dispersing agent, gel plugging agent, coagulant and mixed fiber to obtain mixed powder, uniformly stirring required amounts of thermosetting resin, fluid loss agent and water to obtain mixed liquid, pouring the mixed powder into the mixed liquid, and uniformly stirring to obtain the thermosetting resin gel plugging composition.
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