Composite polyol phase change microcapsule for cooling drilling fluid and preparation method thereof

Abstract

The invention relates to the technical field of drilling fluid cooling, and discloses a drilling fluid cooling composite polyol phase change microcapsule and a preparation method thereof.The drilling fluid cooling composite polyol phase change microcapsule comprises a composite phase change material core material and a composite high-molecular polymer wall material, and the composite phase change material core material comprises composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride; the composite high-molecular polymer wall material comprises polyurea, polyamide, polyurea formaldehyde, polymethyl methacrylate and polystyrene, and the composite phase change material core material and the composite high-molecular polymer wall material in the microcapsule have high phase change latent heat and thermal stability and can effectively absorb and release heat, so that cooling of the drilling fluid is achieved, and the drilling fluid is prevented from falling off. The cooling effect of the drilling fluid is improved, the drilling efficiency is improved, and normal production of enterprises is met.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling fluid cooling, and particularly to a composite polyol phase change microcapsule for drilling fluid cooling and a preparation method thereof. Background Art

[0002] Drilling operation is an important process for the exploitation of underground resources such as oil and natural gas. As a key medium in the drilling process, drilling fluid plays a crucial role in maintaining wellbore stability, carrying cuttings, reducing frictional resistance, and cooling the drill bit. However, as the drilling depth increases, the friction between the drill bit and the formation generates a large amount of heat, causing the temperature of the drilling fluid to gradually rise. This not only affects the drilling efficiency but also may lead to problems such as wellbore instability and increased drill bit wear. Therefore, how to effectively reduce the temperature of the drilling fluid and improve the drilling efficiency has become one of the urgent problems to be solved in the current drilling technology field.

[0003] Traditional methods for cooling drilling fluid mainly involve adding coolants or refrigerants to reduce the temperature of the drilling fluid. However, this method has certain limitations, with limited cooling effect, resulting in a significant reduction in the efficiency of the entire drilling device and being unable to meet the production requirements of enterprises.

[0004] Therefore, we propose a composite polyol phase change microcapsule for drilling fluid cooling and a preparation method thereof. Summary of the Invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a composite polyol phase change microcapsule for drilling fluid cooling and a preparation method thereof.

[0006] To achieve the above object, the present invention adopts the following technical scheme. A composite polyol phase change microcapsule for drilling fluid cooling includes a composite phase change material core and a composite polymer wall material. The composite phase change material core includes composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil, and fluoride. The composite polymer wall material includes polyurea, polyamide, urea-formaldehyde resin, polymethyl methacrylate, and polystyrene.

[0007] Preferably, the composite polyol is composed of a mixture of diethylene glycol, glycerol, dipropylene glycol, tripropylene glycol, triethanolamine, sodium fatty acid, and water.

[0008] Preferably, the composite phase change material core has phase change characteristics, with high thermal stability and phase change latent heat, and can effectively absorb and release heat, thereby achieving the cooling of the drilling fluid.

[0009] Preferably, the composite polymer wall material has good chemical stability and thermal stability, which can effectively protect the core material and prevent its leakage. At the same time, it can also improve the mechanical strength and durability of the microcapsules.

[0010] A preparation method of composite polyol phase change microcapsules for cooling drilling fluid specifically includes the following steps:

[0011] The first step: First, mix composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride evenly and dissolve them in the first organic solvent to obtain a composite phase change material solution;

[0012] The second step: Then, mix polyurea, polyamide, urea-formaldehyde resin, polymethyl methacrylate and polystyrene evenly and dissolve them in the second organic solvent to form a composite polymer solution;

[0013] The third step: Next, mix the composite phase change material solution with the composite polymer solution, and form microcapsules through processes such as emulsification, stirring and curing;

[0014] The fourth step: Finally, perform drying, screening and other treatments on the prepared microcapsules to obtain composite polyol phase change microcapsules.

[0015] Preferably, in the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules.

[0016] Preferably, in the first step, the first organic solvent is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules.

[0017] Preferably, in the second step, the second organic solvent is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules.

[0018] Preferably, in the fourth step, the drying process should be carried out in an environment with low temperature and low humidity to prevent the thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the particle size distribution of the required microcapsules to obtain microcapsule products that meet the use requirements.

[0019] Beneficial effects

[0020] The present invention provides a composite polyol phase change microcapsule for cooling drilling fluid and its preparation method. It has the following beneficial effects:

[0021] (1) This composite polyol phase change microcapsule for cooling drilling fluid and its preparation method. The composite phase change material core and composite polymer wall material in the microcapsules of the present invention have high phase change latent heat and thermal stability, can effectively absorb and release heat, thus achieving the cooling of drilling fluid, improving the cooling effect of drilling fluid, enhancing the drilling efficiency, and meeting the normal production of enterprises.

[0022] (2) This composite polyol phase change microcapsule for cooling drilling fluid and its preparation method. The wall material of the microcapsules of the present invention is selected from polymer materials with good coating performance and stability, which can effectively protect the core material and prevent its leakage. At the same time, it can also improve the mechanical strength and durability of the microcapsules.

[0023] (3) This composite polyol phase change microcapsule for cooling drilling fluid and its preparation method. The preparation method of the microcapsules of the present invention is simple and easy to implement, convenient to operate, can be mass-produced, has broad application prospects, can effectively improve the drilling efficiency, reduce the impact on the environment, and has important practical significance and application value. Detailed implementation mode

[0024] Example 1: A composite polyol phase change microcapsule for cooling drilling fluid, comprising a composite phase change material core and a composite polymer wall material. The composite phase change material core includes composite polyols, paraffin wax, fatty acids, polyesters, polyethylene glycols, silicone oils, and fluorides. The composite polymer wall material includes polyureas, polyamides, urea-formaldehyde resins, polymethyl methacrylate, and polystyrene. The composite polyols are formed by mixing and compounding diethylene glycol, glycerol, diglycerol, triglycerol, triethanolamine, sodium fatty acid, and water. The composite phase change material core has phase change characteristics, high thermal stability, and latent heat of phase change, and can effectively absorb and release heat, thereby achieving the cooling of drilling fluid. The composite polymer wall material has good chemical stability and thermal stability, can effectively protect the core material and prevent its leakage, and can also improve the mechanical strength and durability of the microcapsules. A preparation method of a composite polyol phase change microcapsule for cooling drilling fluid is characterized by specifically including the following steps: First step: First, uniformly mix and dissolve composite polyols, paraffin wax, fatty acids, polyesters, polyethylene glycols, silicone oils, and fluorides in a first organic solvent to obtain a composite phase change material solution; Second step: Then, uniformly mix and dissolve polyureas, polyamides, urea-formaldehyde resins, polymethyl methacrylate, and polystyrene in a second organic solvent to form a composite polymer solution; Third step: Next, mix the composite phase change material solution with the composite polymer solution, and form microcapsules through processes such as emulsification, stirring, and curing. The emulsification process in the third step is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules. The first organic solvent in the first step is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules. The second organic solvent in the second step is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules. The drying process in the fourth step should be carried out in an environment with low temperature and low humidity to prevent thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the particle size distribution of the required microcapsules to obtain microcapsule products that meet the usage requirements. The composite phase change material core and the composite polymer wall material in the microcapsules of the present invention have high latent heat of phase change and thermal stability, can effectively absorb and release heat, thereby achieving the cooling of drilling fluid, improving the cooling effect of drilling fluid, improving drilling efficiency, and meeting the normal production of enterprises.

[0025] Example 2: On the basis of Example 1, the composite phase change material core has phase change characteristics, high thermal stability and latent heat of phase change, and can effectively absorb and release heat, thereby realizing the cooling of drilling fluid. The composite polymer wall material has good chemical stability and thermal stability, can effectively protect the core material and prevent its leakage, and can also improve the mechanical strength and durability of the microcapsules. A preparation method of composite polyol phase change microcapsules for cooling drilling fluid specifically includes the following steps: First step: First, mix composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride evenly and dissolve them in the first organic solvent to obtain a composite phase change material solution; Second step: Then, mix polyurea, polyamide, urea-formaldehyde resin, polymethyl methacrylate and polystyrene evenly and dissolve them in the second organic solvent to form a composite polymer solution; Third step: Next, mix the composite phase change material solution with the composite polymer solution and form microcapsules through processes such as emulsification, stirring and curing; Fourth step: Finally, perform drying, screening and other treatments on the prepared microcapsules to obtain composite polyol phase change microcapsules. In the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules. In the first step, the first organic solvent is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules. In the second step, the second organic solvent is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules. In the fourth step, the drying process should be carried out in an environment of low temperature and low humidity to prevent thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the particle size distribution of the required microcapsules to obtain microcapsule products that meet the usage requirements. The wall material of the microcapsules of the present invention is selected from polymer material with good coating performance and stability, which can effectively protect the core material and prevent its leakage, and can also improve the mechanical strength and durability of the microcapsules.

[0026] Example 3: Based on Example 1 and Example 2, a preparation method of a composite polyol phase change microcapsule for cooling drilling fluid is characterized by specifically including the following steps: The first step: First, mix composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride and dissolve them evenly in a first organic solvent to obtain a composite phase change material solution; The second step: Then, mix polyurea, polyamide, urea formaldehyde, polymethyl methacrylate and polystyrene and dissolve them evenly in a second organic solvent to form a composite polymer solution; The third step: Next, mix the composite phase change material solution with the composite polymer solution, and form microcapsules through processes such as emulsification, stirring and curing; The fourth step: Finally, perform drying, screening and other treatments on the prepared microcapsules to obtain composite polyol phase change microcapsules. In the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules. In the first step, the first organic solvent is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules. In the second step, the second organic solvent is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules. In the fourth step, the drying process should be carried out in an environment with low temperature and low humidity to prevent thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the particle size distribution of the required microcapsules to obtain microcapsule products that meet the usage requirements. The microcapsule preparation method of the present invention is simple and easy to implement, convenient to operate, can be mass-produced, has broad application prospects, can effectively improve drilling efficiency, reduce the impact on the environment, and has important practical significance and application value.

[0027] Example 4: Based on Example 1, Example 2 and Example 3, a preparation method of a composite polyol phase change microcapsule for cooling drilling fluid is characterized in that it specifically includes the following steps: First step: First, mix composite polyol, paraffin wax, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride and dissolve them evenly in a first organic solvent to obtain a composite phase change material solution; Second step: Then, mix polyurea, polyamide, urea-formaldehyde resin, polymethyl methacrylate and polystyrene and dissolve them evenly in a second organic solvent to form a composite polymer solution; Third step: Next, mix the composite phase change material solution with the composite polymer solution, and form microcapsules through processes such as emulsification, stirring and curing; Fourth step: Finally, perform drying, screening and other treatments on the prepared microcapsules to obtain composite polyol phase change microcapsules. In the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules. In the first step, the first organic solvent is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules. In the second step, the second organic solvent is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules. In the fourth step, the drying process should be carried out in an environment of low temperature and low humidity to prevent thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the required particle size distribution of the microcapsules to obtain a microcapsule product that meets the usage requirements.

[0028] Example 5: Based on Example 1, Example 2, Example 3 and Example 4, in the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling temperature and pressure to ensure the formation and stability of the microcapsules. In the first step, the first organic solvent is toluene organic solvent with good solubility for the core material. After the preparation is completed, sufficient washing and drying are required to remove the residual toluene organic solvent on the surface of the microcapsules. In the second step, the second organic solvent is xylene organic solvent with good solubility for the wall material. After the preparation is completed, sufficient washing and drying are required to remove the residual xylene organic solvent on the surface of the microcapsules. In the fourth step, the drying process should be carried out in an environment of low temperature and low humidity to prevent thermal deformation and moisture absorption of the microcapsules. The screening process is carried out according to the required particle size distribution of the microcapsules to obtain a microcapsule product that meets the usage requirements.

[0029] Working principle of the present invention: During the drilling process, due to the friction of the drill bit and the influence of geothermal heat, the temperature of the drilling fluid will continuously rise, which not only affects the drilling efficiency but also may damage the drill bit. The composite polyol phase change microcapsules of the present invention can effectively absorb and release heat, thereby achieving the cooling of the drilling fluid. When the temperature of the drilling fluid rises, the phase change materials such as composite polyols in the microcapsules will absorb heat and change from solid state to liquid state, thus absorbing a large amount of heat and reducing the temperature of the drilling fluid. When the ambient temperature drops, the composite polyols will change from liquid state to solid state again, releasing the heat absorbed before, thus realizing the storage and release of heat. In addition, the wall material of the microcapsules of the present invention is made of a polymer material with good coating performance and stability, which can effectively protect the core material and prevent its leakage. At the same time, it can also improve the mechanical strength and durability of the microcapsules, which enables the microcapsules to work stably in the drilling fluid for a long time, improves the drilling efficiency, and reduces the impact on the environment. Generally speaking, the present invention provides a composite polyol phase change microcapsule for cooling drilling fluid and its preparation method. By utilizing the thermal phase change characteristics of the composite polyol phase change microcapsule, the cooling of the drilling fluid is achieved, the drilling efficiency is improved, and it has important practical significance and application value.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite polyol phase change microcapsule for cooling drilling fluid, characterized in that: It includes a composite phase change material core material and a composite high molecular polymer wall material. The composite phase change material core material includes composite polyols, paraffin, fatty acids, polyesters, polyethylene glycol, silicone oil and fluorides, and the composite high molecular polymer wall material includes polyurea, polyamide, polyurea-formaldehyde, polymethyl methacrylate and polystyrene.

2. The composite polyol phase-change microcapsule for cooling drilling fluid according to claim 1, characterized in that: The composite polyol is prepared by mixing and compounding diethylene glycol, glycerol, dipropylene glycol, trimerpropylene glycol, triethanolamine, sodium fatty acid and water.

3. The composite polyol phase-change microcapsule for cooling drilling fluid according to claim 1, characterized in that: The composite phase change material core has phase change characteristics, high thermal stability and phase change latent heat, and can effectively absorb and release heat, thereby achieving cooling of the drilling fluid.

4. The composite polyol phase-change microcapsule for cooling drilling fluid according to claim 1, characterized in that: The composite high molecular polymer wall material has good chemical stability and thermal stability, can effectively protect the core material and prevent it from leaking, and can also improve the mechanical strength and durability of the microcapsule.

5. A method for preparing composite polyol phase change microcapsules for cooling drilling fluid, characterized in that: The specific steps include: Step 1: First, the composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride are uniformly mixed and dissolved in a first organic solvent to obtain a composite phase change material solution; Step 2: Then, polyurea, polyamide, polyurea-formaldehyde, polymethyl methacrylate and polystyrene are mixed and uniformly dissolved in a second organic solvent to form a composite high molecular polymer solution; Step 3: Next, the composite phase change material solution is mixed with the composite high molecular polymer solution, and microcapsules are formed through emulsification, stirring, curing and other process processes; Step 4: Finally, the prepared microcapsules are dried, sieved, and processed to obtain composite polyol phase change microcapsules.

6. The method for preparing composite polyol phase-change microcapsules for cooling drilling fluid according to claim 5, characterized in that: In the third step, the emulsification process is carried out using a high-speed emulsifier, the stirring process is carried out using a high-speed stirrer, and the curing process is achieved by controlling the temperature and pressure to ensure the formation and stability of the microcapsules.

7. The method for preparing composite polyol phase-change microcapsules for cooling drilling fluid according to claim 5, characterized in that: In the first step, the first organic solvent is toluene organic solvent which has good solubility for the core material. After the preparation is completed, it needs to be fully washed and dried to remove the toluene organic solvent residue on the surface of the microcapsule.

8. The method for preparing composite polyol phase-change microcapsules for cooling drilling fluid according to claim 5, characterized in that: The second organic solvent in the second step is a xylene organic solvent having good solubility for the wall material. After the preparation is completed, it needs to be fully washed and dried to remove the xylene organic solvent residue on the surface of the microcapsule.

9. The method for preparing composite polyol phase-change microcapsules for cooling drilling fluid according to claim 5, characterized in that: The drying process in the fourth step should be carried out in a low temperature and low humidity environment to prevent thermal deformation and moisture absorption of the microcapsules, and the screening process is carried out according to the particle size distribution of the desired microcapsules to obtain a microcapsule product that meets the use requirements.