CN-121991649-A - Wen Minjiao adhesive polymer applied to water-based and oil-based drilling fluid for improving formation pressure-bearing plugging and preparation method thereof

Abstract

A Wen Minjiao adhesive polymer for improving the pressure-bearing plugging of a stratum, which is applied to water-based and oil-based drilling fluids, relates to the technical field of oilfield drilling and solves the problems of lost circulation leakage, repeated leakage and poor plugging efficiency of the drilling fluid caused by insufficient pressure-bearing capacity of a plugging material in the existing method. The Wen Minjiao adhesive polymer for pressure-bearing plugging comprises the following components in percentage by mass, namely, bridging particles, mica, polyurethane foam, functional adhesive materials, branched epoxy resin, graphite and superfine calcium carbonate in a mass ratio of 30-35:10-15:1-2:1-2:2-4:2-4:40-45, and the preparation method comprises the following steps of proportionally mixing the bridging particles, the mica, the polyurethane foam, the branched epoxy resin, the graphite, the superfine calcium carbonate and the functional adhesive materials, adding the mixture into soil slurry/drilling fluid, and uniformly stirring and mixing the mixture to prepare the Wen Minjiao adhesive polymer. The Wen Minjiao adhesive polymer has strong bearing capacity and wider crack blocking range.

Inventors

• YAN JING
• ZHU XIUYU
• JIA XINPENG
• WANG HAIMIAO
• ZHAO YATAO
• ZHANG DONGMING
• Duan Zun
• ZHU GUANGYU
• XIA MENGYING
• ZHANG YANG
• XU YUNLONG
• ZHANG ZHENHUA
• ZHANG KUN
• PAN YONGQIANG
• LI HAODONG
• ZHANG YUWEN
• GUO DONG

Assignees

• 大庆钻探工程有限公司
• 中国石油天然气集团有限公司

Dates

Publication Date

20260508

Application Date

20250627

Claims (10)

1. 1. The Wen Minjiao-viscosity polymer for improving the pressure-bearing plugging of the stratum is applied to water-based and oil-based drilling fluid, and is characterized by comprising the following components in mass ratio of bridging particles, mica, polyurethane foam, functional adhesive materials, branched epoxy resin, graphite and superfine calcium carbonate of 30-35:10-15:1-2:1-2:2-4:2-4:40-45.
2. 2. The Wen Minjiao-viscosity polymer for improving formation pressure-bearing plugging applied to water-based and oil-based drilling fluids according to claim 1, wherein the polymer is characterized by: the bridging particles are any one of walnut shells and vermiculite; The mesh number range of the walnut shells, the vermiculite and the mica is 2-40 meshes; typical particle sizes of the graphite and ultra-fine calcium carbonate are 800 mesh and 1250 mesh.
3. 3. The Wen Minjiao-adhesive polymer for improving formation pressure-bearing plugging applied to water-based and oil-based drilling fluids according to claim 1, wherein the functional adhesive material is any one of a thermoplastic adhesive material, a thermosetting adhesive material, an elastomer adhesive material and a composite adhesive material.
4. 4. The Wen Minjiao-viscosity polymer for improving formation pressure-bearing plugging for water-based and oil-based drilling fluids according to claim 3, wherein the thermoplastic adhesive material is at least one of ethylene vinyl acetate, polyethylene, polypropylene, polyurethane, polyamide and polyacrylamide; the thermosetting adhesive material is at least one of epoxy resin, urea resin and phenolic resin; The elastomer type adhesive material is at least one of nitrile rubber, thermoplastic elastomer and organic silicon rubber; The composite adhesive material is at least one of aldehyde-nitrile rubber, epoxy-nitrile rubber and epoxy-polyurethane rubber.
5. 5. The Wen Minjiao-sticky polymer for improving formation pressure-bearing plugging for water-based and oil-based drilling fluids according to claim 1, wherein the branched epoxy resin synthesis raw materials comprise phenols containing amino groups, nitriles containing benzene rings, epichlorohydrin, zirconium dioxide and silane coupling agents; The molar ratio of the amino-containing phenolic substance to the benzene ring-containing nitrile substance to the epichlorohydrin is 1 (0.3-2) to 3-6.
6. 6. The Wen Minjiao-viscosity polymer for improving formation pressure-bearing plugging applied to water-based and oil-based drilling fluids according to claim 5, wherein the branched epoxy resin is prepared by the following steps: S1, adding epichlorohydrin into a three-necked flask, heating to 30-50 ℃, adding an amino-containing phenolic substance, adding NaOH to adjust the pH to be alkaline, adding a catalyst benzyl triethyl ammonium chloride, stirring for 0.5-4 hours at 40-60 ℃, heating to 80-100 ℃ to react for 4-8 hours, cooling the solution to 40-50 ℃, dripping a sodium hydroxide aqueous solution, stirring for 2-4 hours, and purifying to obtain an epoxy-containing substance; S2, adding nitrile substances containing benzene rings and deionized water into a round-bottom flask, adding CuFe2O4, stirring for 2-5 hours, adding NaBH4, refluxing, stirring for 0.5-4 hours, cooling to room temperature, separating a catalyst by using an external magnet, adding ethyl acetate, extracting a reaction mixture, drying on anhydrous sodium sulfate, evaporating a solvent under reduced pressure, and washing for 3 times to obtain benzene substances containing amino groups; S3, placing zirconium dioxide in a vacuum drying oven for drying for 8-12 hours, accurately weighing the dried zirconium dioxide in a three-necked flask, adding absolute ethyl alcohol into the three-necked flask for ultrasonic dispersion for 30-50 minutes, placing the three-necked flask into a water bath, mounting a reflux condensing device, slowly dripping HCl to adjust the pH value of a solution to 3-4, slowly adding a silane coupling agent, heating to 70-90 ℃ for stirring for 60-80 minutes, carrying out suction filtration and washing for 3-5 times, and carrying out vacuum drying for 24-26 hours at 60-70 ℃ to obtain silane coupling agent modified zirconium dioxide; And S4, mixing the epoxy group-containing substance prepared in the step S1 and the amino group-containing benzene substance prepared in the step S2, heating to 120-180 ℃ for reaction for 5-8 hours to obtain a branched epoxy resin polymer, and mixing the branched epoxy resin polymer and the silane coupling agent modified zirconium dioxide prepared in the step S3 to obtain the pressure-bearing plugging branched epoxy resin.
7. 7. The Wen Minjiao adhesive polymer for improving formation pressure-bearing plugging of water-based and oil-based drilling fluids according to claim 5, wherein the silane coupling agent is any one of 3- (2, 3-glycidoxy) propyl trimethoxy silane and 3- (2, 3-glycidoxy) propyl triethoxy silane.
8. 8. The polymer Wen Minjiao for improving the pressure-bearing plugging of a stratum by applying the polymer to water-based and oil-based drilling fluids according to claim 5, wherein the amino-containing phenolic substance is at least one of 4-amino-1-naphthol, 1-amino-4-hydroxyanthraquinone, 1, 8-diamino-4, 5-dihydroxy-9, 10-anthracenedione and 1, 5-diamino-4, 8-dihydroxy-9, 10-anthracenedione; The nitrile substance containing benzene ring is at least one of triphenylene-1, 3-dicyanonitrile, 5-phenoxy-1, 3-phthalonitrile and 5- [3- [ (3, 5-dicyanophenoxy) methyl ] phenoxy ] -1, 3-phthalonitrile.
9. 9. A method for preparing Wen Minjiao viscosity polymer for improving formation pressure-bearing plugging applied to water-based and oil-based drilling fluid according to any one of claims 1-8, which is characterized by comprising the following steps: weighing bridging particles, mica, polyurethane foam, branched epoxy resin, graphite, superfine calcium carbonate and functional adhesive materials according to a certain proportion, mixing, adding into soil slurry/drilling fluid, and stirring and mixing uniformly to prepare Wen Minjiao adhesive polymer.
10. 10. The method of claim 9, wherein the stirring speed is 8000r/min and the stirring time is 20min.

Description

Wen Minjiao adhesive polymer applied to water-based and oil-based drilling fluid for improving formation pressure-bearing plugging and preparation method thereof Technical Field The invention relates to the technical field of drilling of oil and gas fields, in particular to Wen Minjiao adhesive polymer for improving formation pressure-bearing plugging applied to water-based and oil-based drilling fluids and a preparation method thereof. Background Lost circulation is a phenomenon that drilling fluid leaks into a drilled stratum in a large amount in the drilling construction process, and is one of the most common and difficult-to-handle complex accidents of drilling engineering of complex stratum. Once the crack development, the fragility and the complicated stratum of the pressure system are lost, the loss of drilling fluid, the extension of drilling period and the increase of drilling cost are caused, and the improper treatment can cause the complex of lost return of the drilling fluid, blowout, overflow and leakage, stratum collapse and the like, and simultaneously, the life safety of operators is also threatened to a certain extent. The common drilling fluid leakage adopts the principle of 'mainly preventing and blocking-preventing combination'. Reasonable well structure, reduced drilling fluid pressure agitation, safe mechanical drilling speed implementation, drilling fluid performance adjustment, drilling fluid density reduction, and leakage-proof plugging material addition to the drilling fluid in advance to realize the prevention of lost circulation. After the leakage occurs, firstly reducing the displacement observation leakage speed, then selecting leakage blocking modes such as while-drilling leakage blocking, static leakage blocking, solidification leakage blocking and the like according to the leakage condition, and reducing the leakage amount of the drilling fluid until the drilling fluid stops leaking. Typically, while drilling lost circulation is used to treat low and medium lost circulation, static lost circulation and cured lost circulation is used to treat medium lost circulation, severe lost circulation and lost circulation. The static plugging material is susceptible to stratum pressure in the aspects of cracking, fragility, complex pressure system and the like, and the plugging effect is influenced by factors such as bridging material grading, bridging slurry concentration, extrusion-replacement pressure during construction and the like, so that the problems of 'sealing a door', infirm plugging, repeated leakage and the like are easily caused, and the plugging efficiency is influenced. The safety risk of the solidification plugging construction is high, and the solidification plugging construction is easy to be polluted or diluted by high-mineralization stratum water, so that the drilling sticking or detention capability is poor. The existing plugging material can solve the problem of conventional drilling fluid leakage in site, however, along with the continuous widening of the drilling field, the problems of cracking stratum, broken stratum, complicated stratum of a pressure system, abnormally high pressure wells and narrow/negative safety density window wells, poor drilling fluid leakage, repeated leakage, poor plugging efficiency and the like caused by insufficient bearing capacity of the plugging material in the drilling construction process can be solved. Therefore, developing plugging materials for improving the bearing capacity of the stratum to cope with the above well leakage is a problem to be solved urgently. Disclosure of Invention The invention provides a Wen Minjiao adhesive polymer for improving the pressure-bearing plugging of a stratum, which is applied to water-based and oil-based drilling fluids, aiming at the problems of drilling fluid return loss, repeated loss and poor plugging efficiency caused by insufficient pressure-bearing capacity of plugging materials when the conventional plugging method in the background technology drills a complex stratum. The Wen Minjiao adhesive polymer for improving the pressure-bearing plugging of the stratum is applied to water-based and oil-based drilling fluid, a functional adhesive material with sensitive characteristic to temperature is introduced, branched epoxy resin capable of improving the pressure-bearing capacity is synthesized, the pressure-bearing capacity of the plugging material is strong, the range of plugging cracks is wider, and the problem of drilling fluid leakage can be better solved. The invention solves the problems by the following technical scheme that the Wen Minjiao adhesive polymer for improving the pressure-bearing plugging of the stratum is applied to water-based and oil-based drilling fluid, and the mass ratio of the components to each other is 30-35:10-15:1-2:1-2:2-4:2-4:40-45. Preferably, the bridging particles are any one of walnut shells and vermiculite; The mesh number range of the walnut shells, t