Synthetic base fluid for drilling fluid and its processing method

Abstract

The application provides a base fluid for synthetic base drilling fluid and a processing method thereof, and belongs to the technical field of drilling fluid base fluid preparation, and solves the technical problems of low preparation efficiency and poor performance of the base fluid for synthetic base drilling fluid. The processing method comprises the following steps: step one, production preparation; step two, preliminary mixing; step three, first mixing; step four, second mixing; step five, neutral cleaning; and step six, vacuum distillation, removal of solvent and unreacted 1-decene, collection of heavy components, and obtaining of the base fluid for synthetic base drilling fluid. The base fluid for synthetic base drilling fluid has appearance, density, freezing point, flash point and fluorescence level meeting technical indexes. The processing method realizes pipeline stirring and mixing, has high mixing efficiency, fast reaction speed, stable and accurate injection material ratio, stable and adjustable temperature, ensures reaction effect, and integrates and installs each component through a pry base, is convenient to hoist, and is convenient to load, unload and move, and has high purity.

Description

Technical Field

[0001] This invention belongs to the field of drilling fluid preparation technology, and relates to a base fluid for synthetic drilling fluid, and more particularly to a processing method for a base fluid for synthetic drilling fluid. Background Technology

[0002] Synthetic-based drilling fluids emerged to address the limitations of water-based drilling fluids in meeting the performance requirements of complex downhole conditions, and the inability of oil-based and mineral oil-based drilling fluids to meet environmental protection requirements. From their inception, synthetic-based drilling fluids have shown promising development prospects and achieved significant environmental and economic benefits.

[0003] With the increasing number of complex wells and increasingly stringent environmental regulations, higher demands are being placed on the performance of drilling fluids. Synthetic-based drilling fluids are developed to meet the performance requirements of water-based drilling fluids in complex downhole conditions.

[0004] The base fluid is the main component in drilling fluid production, and its performance indicators determine most of the drilling fluid's performance parameters, such as flash point, viscosity, and freezing point. Currently, synthetic drilling fluids are generally made with ester-based and ether-based base fluids.

[0005] Its main drawbacks are as follows: First, the active carboxyl groups in the base fluid molecules are easily destroyed by alkaline or acidic substances to generate alcohols and carboxylic acids. Therefore, during the drilling process, the intrusion of acidic gases can lead to ester hydrolysis, thereby affecting the stability of the drilling fluid. Second, when drilling offshore wells, the drilling fluid may drop to around 4°C after the pump is stopped due to the cooling effect of seawater. At such a low temperature, the drilling fluid will become too thick, which will lead to an increase in pump pressure and cause complex downhole conditions such as formation fracturing and wellbore instability.

[0006] Existing base liquid processing and preparation methods are inefficient, and their properties such as flash point, viscosity, and freezing point do not meet technical requirements.

[0007] A search revealed that Chinese patent documents disclose a base fluid for synthetic drilling fluids [Application No.: 201110297207.6; Publication No.: CN102443381A]. This base fluid's raw material composition includes: limonene, dipentene, ethylene glycol monobutyl ether, alkyl glycosides, alcohol ether carboxylates, white oil, and dimethyl silicone oil. While this base fluid overcomes the shortcomings of single-component solutions, its flash point, viscosity, and freezing point do not meet technical requirements, and no processing method is disclosed.

[0008] Based on this, we propose a synthetic-based drilling fluid base liquid and its processing method. The synthetic-based drilling fluid base liquid meets the technical specifications in terms of appearance, density, pour point, flash point, and fluorescence level. The processing method achieves automated mixing, resulting in high mixing efficiency, fast reaction speed, and stable and accurate injection ratio. The temperature is stable and adjustable, ensuring the reaction effect. The components are integrated and installed on a skid-mounted base, facilitating lifting, loading, unloading, and movement, and ensuring high purity. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a synthetic-based drilling fluid base liquid and its processing method. The technical problem to be solved by this invention is: how to achieve stable and efficient automated production of synthetic-based drilling fluid base liquid while ensuring that properties such as appearance, density, pour point, flash point, and fluorescence level meet technical specifications.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A synthetic-based drilling fluid base fluid and its processing method are disclosed. The processing method for the synthetic-based drilling fluid base fluid includes the following processing steps:

[0012] Step 1, Production Preparation: Clean up the production site, determine the product process and formula, check whether the machinery and equipment can operate normally, and prepare raw materials according to the proportions.

[0013] Step 2, preliminary mixing: Nitrogen gas is generated by a nitrogen generator and injected into the first, second, and third reaction vessels to replace the oxygen inside them. The stirring component of the first reaction vessel is turned on, and a fixed amount of C10 α-olefin liquid and cyclohexane liquid are injected into the first reaction vessel through two liquid injectors. The mixture is stirred and mixed to obtain a preliminary mixture. During the injection, nitrogen gas overflows and is released into the air.

[0014] Step 3, primary mixing: The stirring component of the second reactor is turned on, and the preliminary mixture inside the first reactor is injected into the second reactor through the injection pump. CHCl3 liquid is injected into the second reactor through the liquid injector, and a certain amount of EtAlCl2 solid and FeCl3 solid are injected into the second reactor through the solid injector. The mixture is stirred and mixed to obtain mixture I. Nitrogen gas overflows during injection and is discharged into the air.

[0015] Step 4, secondary mixing: The stirring component of the third reactor is turned on, and the No. I mixture inside the second reactor is injected into the third reactor through the injection pump. 1-decene liquid is added dropwise into the third reactor through the dripping mechanism. The mixture is stirred and mixed to obtain the No. II mixture. Nitrogen gas overflows during injection and is discharged into the air.

[0016] Step 5, Neutral cleaning: Water and sodium hydroxide solid are injected into the third reaction vessel in sequence to obtain sodium hydroxide aqueous solution;

[0017] The mixture from reactor II in the third reactor is injected into the washing tank using a feed pump and washed until neutral to obtain a washing solution.

[0018] Step 6, vacuum distillation: The washing liquid inside the cleaning tank is injected into the distillation unit through the injection pump to carry out vacuum distillation, remove the solvent and unreacted 1-decene, collect the heavy components, and obtain the base fluid for synthetic drilling fluid.

[0019] In step two, the weight ratio of C10 α-olefin liquid to cyclohexane liquid is 5:1.

[0020] In step three, the weight mixing ratio of CHCl3 liquid, EtAlCl2 solid, and FeCl3 solid is 120:25:1.

[0021] In step four, the weight mixing ratio of mixture I and 1-decene liquid is 1:2.

[0022] In step five, the sodium hydroxide aqueous solution is a 10% sodium hydroxide aqueous solution.

[0023] In step two, the first, second, and third reactors are connected to the hot water circulation mechanism via pipes. The reaction temperature of the first reactor is 25°C, the reaction temperature of the second reactor is 60°C, and the reaction temperature of the third reactor is 40°C.

[0024] In step four, the 1-decene liquid was added dropwise over 15 minutes, and the stirring reaction time was 60 minutes.

[0025] An auxiliary emulsifier for synthetic-based drilling fluids includes a synthetic-based drilling fluid base prepared by the above-described processing method for synthetic-based drilling fluid base.

[0026] The processing method for the base fluid used in this synthetic drilling fluid includes a skid-mounted base. A nitrogen generator, three reaction vessels, a hot water circulation mechanism, a cleaning tank, a distillation mechanism, and a liquefied gas tank are mounted on top of the skid-mounted base. The nitrogen generator is connected to each of the three reaction vessels via pipelines. The three reaction vessels, the cleaning tank, and the distillation mechanism are arranged sequentially. Each reaction vessel is equipped with a circulating hot water hood, and each circulating hot water hood is connected to the hot water circulation mechanism by a water pump. Injection pumps are installed between the three reaction vessels, between the third reaction vessel and the cleaning tank, and between the cleaning tank and the distillation mechanism. The nitrogen generator is located on the side of the reaction vessel, and the hot water circulation mechanism is located on the side of the cleaning tank. Two mounting brackets are fixed on top of the skid-mounted base. Three liquid injectors, a solid injector, and a dripping mechanism are sequentially mounted on one of the mounting brackets. The first two liquid injectors are located on the side of the first reaction vessel, and the solid injector is located on the mounting bracket on the other side. The last liquid injector and two solid injectors are located on the side of the second reaction vessel, and the dripping mechanism is located on the side of the third reaction vessel.

[0027] Nitrogen gas is produced by a nitrogen generator and injected into three reaction vessels to replace the oxygen inside the three reaction vessels. The stirring component of the first reaction vessel is turned on, and a certain amount of C10 α-olefin liquid and cyclohexane liquid are injected into the first reaction vessel through two liquid injectors. The mixture is stirred and mixed to obtain a preliminary mixture. Nitrogen gas overflows during injection and is discharged into the air.

[0028] The stirring component of the second reactor is turned on, and the preliminary mixture inside the first reactor is injected into the second reactor through the injection pump. CHCl3 liquid is injected into the second reactor through the liquid injector, and a certain amount of EtAlCl2 solid and FeCl3 solid are injected into the second reactor through the solid injector. The mixture is stirred and mixed to obtain mixture I. Nitrogen gas overflows during injection and is discharged into the air.

[0029] The stirring component of the third reactor is turned on, and the No. I mixture inside the second reactor is injected into the third reactor through the injection pump. ☐-decene liquid is added dropwise into the third reactor through the dripping mechanism. After stirring and mixing, the No. II mixture is obtained. Nitrogen gas overflows during injection and is discharged into the air.

[0030] Neutral cleaning: Water and sodium hydroxide solid were injected into the third reactor sequentially to obtain an aqueous sodium hydroxide solution;

[0031] The mixture from reactor II in the third reactor is injected into the washing tank using a feed pump and washed until neutral to obtain a washing solution.

[0032] The washing liquid inside the cleaning tank is injected into the distillation unit by the injection pump for vacuum distillation to remove the solvent and unreacted 1-decene. The heavy components are collected to obtain the base fluid for synthetic drilling fluid.

[0033] Several lifting lugs are fixed on both sides of the skid-mounted base. The hot water circulation mechanism includes a hot water tank and a heater. The hot water tank is fixed on the skid-mounted base, the heater is installed on the hot water tank, and a hot water pump is installed on the hot water tank. The outlet of the hot water pump is equipped with a multi-port connector. The multi-port connector is connected to the corresponding circulating hot water cover through water pipes. Each water pipe is equipped with an electric control valve.

[0034] The lifting lugs facilitate the lifting of this device, making it easy to load, unload, and move. The heater heats the clean water inside the hot water tank to obtain hot water. The hot water pump injects the hot water into the corresponding circulating hot water hoods through multi-port connectors to ensure the reaction temperature of the reactor. The electric control valve is used to control the water injection volume.

[0035] The liquid feeder includes a fixed base, which is fixed to the upper end of the mounting frame. A distributor, a retracting push rod, and a piston discharge pipe are fixed to the upper end of the fixed base. The telescopic end of the retracting push rod is fixedly connected to the piston rod of the piston discharge pipe. The distributor and the piston discharge pipe are connected. A connecting rod is fixed to the end of the feed rod of the distributor. A feed push rod is hinged between the end of the connecting rod and the fixed base. A liquid hopper is fixedly connected to the upper end of the distributor. A liquid outlet valve is fixedly connected to the side of the distributor. A liquid outlet push rod is fixedly connected to the upper end of the liquid outlet valve. The telescopic end of the liquid outlet push rod is fixedly connected to the valve stem of the liquid outlet valve. A liquid outlet pipe is provided at the lower end of the liquid outlet valve. The liquid outlet pipe is connected to the feed pipe of the corresponding reaction vessel through a pipeline.

[0036] Liquid raw materials are injected into the liquid hopper. The feeding push rod and connecting rod work together to move the feeding rod, connecting the liquid hopper to the distributor and the piston discharge pipe. The retractable end of the push rod pulls the piston rod of the piston discharge pipe outward, injecting liquid raw materials into the piston discharge pipe. The feeding push rod and connecting rod work together to move the feeding rod, connecting the liquid discharge valve to the distributor and the piston discharge pipe. The retractable end of the liquid discharge push rod pulls the valve rod of the liquid discharge valve, adjusting the liquid discharge rate. The retractable end of the push rod pushes the piston rod of the piston discharge pipe inward, injecting liquid raw materials into the liquid discharge valve and discharging them from the liquid discharge pipe. The liquid then enters the reactor through the reactor's feed pipe.

[0037] The solid feeder includes a housing fixed to the top of a mounting frame. A fixing rod is fixed to the housing, and a solid material hopper is fixed to the side of the fixing rod. A guide pipe is located at the lower end of the solid material hopper. A rotating shaft is rotatably mounted on the upper end of the housing, and a connecting plate is fixed to the upper end of the housing. The rotating shaft passes through the center of the connecting plate, and a turntable is fixed to the upper end of the rotating shaft. Several circumferentially distributed metering sleeves are located at the lower end of the turntable. One metering sleeve is positioned directly below the guide pipe, with the lower end of the guide pipe abutting against the turntable. Springs are fitted around the outside of each metering sleeve. The upper and lower ends of the metering sleeve abut against the turntable and the metering sleeve respectively. The lower end of the metering sleeve abuts against the upper end of the connecting plate. The lower end of the connecting plate is provided with a metering sleeve located directly above the discharge pipe. The discharge pipe is connected to the feed pipe of the corresponding reactor through a pipe. The discharge motor and the speed controller are fixed inside the machine box. A pulley pair is provided between the output shaft of the discharge motor and the input shaft of the speed controller. The upper end of the output shaft of the speed controller is fixed with a drive gear, and the lower end of the rotating shaft is fixed with a driven gear. The driven gear meshes with the drive gear.

[0038] Solid granular material is poured into the solid hopper and falls into the feed pipe, then into the metering sleeve. The output shaft of the discharge motor drives the input shaft of the regulator to rotate intermittently via a pulley pair. The output shaft of the regulator drives the drive gear to rotate intermittently. The driven gear meshes with the drive gear, driving the driven gear to rotate intermittently, thus causing the turntable to rotate intermittently. The lower end face of the metering sleeve abuts against the upper end face of the connecting plate and rotates intermittently. As the discharge pipe rotates, the solid granular material inside the metering sleeve falls into the discharge pipe and enters the reactor through the feed pipe of the reactor.

[0039] The dripping mechanism includes several mounting rods, which are fixed to the upper end of the mounting frame. Each mounting rod has a second adjusting push rod fixed to its upper end. A fixing rod is fixed to the telescopic end of the second adjusting push rod. A first connecting seat is adjustablely provided on the fixing rod. An adjusting push rod is provided on the first connecting seat. A dripping tube is fixed to the telescopic end of the adjusting push rod. The dripping tube is directly above the feed pipe of the corresponding reactor.

[0040] The telescopic end of the second adjusting push rod drives the fixed rod to move, thereby adjusting the position of the drip tube outlet. The telescopic end of the adjusting push rod drives the drip tube to move, thereby adjusting the angle of the drip tube outlet so that the drip tube is directly above the corresponding reactor feed pipe.

[0041] The distillation unit includes a liquefied gas tank, a heating vaporization tank, a condenser, a circulating pump, a receiving box, and a collection bottle. The liquefied gas tank, heating vaporization tank, condenser, circulating pump, and receiving box are all fixed to the upper end of the skid-mounted base. The collection bottle is placed on the upper end of the skid-mounted base and is located below the light component pipe of the condenser. The condenser and the cleaning tank are connected by a pipeline, the liquefied gas tank and the heating vaporization tank are connected by a pipeline, the heating vaporization tank and the condenser are connected by a pipeline, and the condenser and the receiving box are connected by a pipeline. The circulating pump is connected to the condenser and the receiving box by pipelines.

[0042] The liquefied gas tank provides liquefied gas to the heating vaporization tank. The heating vaporization tank distills the neutral washing liquid under reduced pressure to obtain gas. The gas enters the condenser for condensation treatment. The condensed light components flow out from the light component pipe and are collected in the collection bottle to remove solvent and unreacted decene. The heavy components are introduced into the receiving box to obtain the base fluid for synthetic drilling fluid. The circulation pump re-injects the receiving box into the condenser for repeated condensation to ensure the purity of the base fluid for synthetic drilling fluid.

[0043] Compared with existing technologies, the synthetic-based drilling fluid and its processing method have the following advantages:

[0044] The appearance, density, pour point, flash point, and fluorescence level of this synthetic drilling fluid all meet the technical specifications.

[0045] The processing method for this synthetic drilling fluid base liquid utilizes three reaction vessels and injection pumps to achieve continuous stirring and mixing, resulting in high mixing efficiency and fast reaction speed. A hot water circulation mechanism, in conjunction with a circulating hot water hood, controls the reaction temperature of the reaction vessels, ensuring optimal reaction results. Liquid raw materials are quantitatively injected through a liquid injector, solid raw materials through a solid injector 7, and an initiator is quantitatively added through a dropping mechanism, ensuring accurate proportions of each material. All components are integrated and mounted on a skid-mounted base, facilitating lifting, loading, unloading, and relocation. A distillation mechanism performs stable and efficient vacuum distillation to remove solvents and unreacted 1-decene, collecting heavy components to obtain a high-purity synthetic drilling fluid base liquid. Attached Figure Description

[0046] Figure 1 This is a process flow diagram of the present invention.

[0047] Figure 2 This is a schematic diagram of the front three-dimensional structure of some devices in this invention.

[0048] Figure 3 This is a schematic diagram of the rear three-dimensional structure of some devices in this invention.

[0049] Figure 4 This is a three-dimensional structural diagram of the liquid injector in this invention.

[0050] Figure 5 This is a three-dimensional structural diagram of the solid feeder in this invention.

[0051] Figure 6 This is a three-dimensional structural diagram of the dripping mechanism in this invention.

[0052] In the diagram: 1. Skid-mounted base; 2. Mounting frame; 3. Nitrogen generator; 4. Circulating hot water cover; 5. Reactor; 6. Liquid feeder; 7. Solid feeder; 8. Dropping mechanism; 9. Feed pump; 10. Hot water tank; 11. Cleaning tank; 12. Heater; 13. Distillation mechanism; 14. Liquefied gas tank; 15. Lifting lug; 16. Heated vaporization tank; 17. Condenser; 18. Circulating pump; 19. Receiving box; 20. Collection bottle; 21. Connecting rod; 22. Diverter; 23. Liquid outlet pipe; 24. Liquid outlet valve; 25. Liquid outlet push rod; 26. Material pusher. 27. Rod; 28. Chassis; 29. ​​Fixing rod; 30. Solid hopper; 31. Guide pipe; 32. Turntable; 33. Metering sleeve; 34. Rotating shaft; 35. Discharge pipe; 36. Connecting plate; 37. Spring; 38. Driven gear; 39. Pulley pair; 40. Discharge motor; 41. Adjuster; 42. Drive gear; 43. Dropping pipe; 44. Adjusting push rod; 45. First connecting seat; 46. Fixing rod; 47. Second adjusting push rod; 48. Mounting rod; 49. Liquid hopper; 50. Fixing seat; 51. Closing push rod; 52. Piston discharge pipe. Detailed Implementation

[0053] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0054] like Figure 1 As shown, the processing method for the base fluid used in this synthetic drilling fluid includes the following processing steps:

[0055] Step 1, Production Preparation: Clean up the production site, determine the product process and formula, check whether the machinery and equipment can operate normally, and prepare raw materials according to the proportions.

[0056] Step 2, preliminary mixing: Nitrogen gas is prepared by nitrogen generator 3 and injected into the first reactor 5, the second reactor 5 and the third reactor 5 to replace the oxygen inside the first reactor 5, the second reactor 5 and the third reactor 5. The stirring component of the first reactor 5 is turned on and a certain amount of C10 α-olefin liquid and cyclohexane liquid are injected into the first reactor 5 through two liquid injectors 6. The mixture is stirred and mixed to obtain a preliminary mixture. During the injection, nitrogen gas overflows and is discharged into the air.

[0057] Step 3, primary mixing: The stirring component of the second reactor 5 is turned on, and the preliminary mixture inside the first reactor 5 is injected into the second reactor 5 through the injection pump 9. CHCl3 liquid is injected into the second reactor 5 through the liquid injector 6, and a certain amount of EtAlCl2 solid and FeCl3 solid are injected into the second reactor 5 through the solid injector 7. The mixture is stirred and mixed to obtain mixture I. Nitrogen gas overflows during injection and is discharged into the air.

[0058] Step 4, secondary mixing: The stirring component of the third reactor 5 is turned on, and the No. I mixture inside the second reactor 5 is injected into the third reactor 5 through the injection pump 9. 1-decene liquid is added dropwise into the third reactor 5 through the dripping mechanism 8. After stirring and mixing, the No. II mixture is obtained. Nitrogen gas overflows during injection and is discharged into the air.

[0059] Step 5, Neutral cleaning: Water and sodium hydroxide solid are injected into the third reaction vessel 5 in sequence to obtain sodium hydroxide aqueous solution;

[0060] The mixture II from the third reactor 5 is injected into the cleaning tank through the injection pump 9 and washed until neutral to obtain the washing liquid.

[0061] Step 6, vacuum distillation: The washing liquid inside the cleaning tank 11 is injected into the distillation unit 13 through the injection pump 9 to carry out vacuum distillation, remove the solvent and unreacted 1-decene, collect the heavy components, and obtain the base fluid for synthetic drilling fluid.

[0062] In step two, the weight ratio of C10 α-olefin liquid to cyclohexane liquid is 5:1.

[0063] In step three, the weight mixing ratio of CHCl3 liquid, EtAlCl2 solid, and FeCl3 solid is 120:25:1.

[0064] In step four, the weight ratio of mixture I and 1-decene liquid is 1:2.

[0065] In step five, the sodium hydroxide aqueous solution is a 10% sodium hydroxide aqueous solution.

[0066] In step two, the first reactor 5, the second reactor 5, and the third reactor 5 are connected to the hot water circulation mechanism through pipes. The reaction temperature of the first reactor 5 is 25℃, the reaction temperature of the second reactor 5 is 60℃, and the reaction temperature of the third reactor 5 is 40℃.

[0067] In step four, the 1-decene liquid was added dropwise over 15 minutes, and the stirring reaction time was 60 minutes.

[0068] An auxiliary emulsifier for synthetic-based drilling fluids includes a synthetic-based drilling fluid base prepared by the above-described processing method for synthetic-based drilling fluid base.

[0069] like Figure 2-6 As shown, the processing method for the base fluid used in this synthetic drilling fluid includes a skid-mounted base 1. Above the skid-mounted base 1 are a nitrogen generator 3, three reaction vessels 5, a hot water circulation mechanism, a cleaning tank 11, a distillation mechanism 13, and a liquefied gas tank 14. The nitrogen generator 3 is connected to each of the three reaction vessels 5 via pipelines. The three reaction vessels 5, the cleaning tank 11, and the distillation mechanism 13 are arranged sequentially. Each reaction vessel 5 is equipped with a circulating hot water hood 4, and each circulating hot water hood 4 is connected to the hot water circulation mechanism by a water pump. The three reaction vessels 5 are connected to each other, the third reaction vessel 5 is connected to the cleaning tank 11, and the cleaning tank 11 is connected to the other. A feed pump 9 is provided between the distillation mechanism 13 and the reaction vessel 5. The nitrogen generator 3 is located on the side of the reaction vessel 5. The hot water circulation mechanism is located on the side of the cleaning tank 11. Two mounting brackets 2 are fixed above the skid base 1. Three liquid feeders 6, solid feeders 7 and a dripping mechanism 8 are arranged sequentially on one side of the mounting bracket 2. The first two liquid feeders 6 are located on the side of the first reaction vessel 5. The solid feeder 7 is arranged on the mounting bracket 2 on the other side. The last liquid feeder 6 and two solid feeders 7 are located on the side of the second reaction vessel 5. The dripping mechanism 8 is located on the side of the third reaction vessel 5.

[0070] Nitrogen generator 3 produces nitrogen gas, which is then injected into three reaction vessels 5 to replace the oxygen inside the three reaction vessels 5. The stirring component of the first reaction vessel 5 is turned on, and a certain amount of C10 α-olefin liquid and cyclohexane liquid are injected into the first reaction vessel 5 through two liquid injectors 6. The mixture is stirred and mixed to obtain a preliminary mixture. Nitrogen gas overflows during injection and is discharged into the air.

[0071] The stirring component of the second reactor 5 is turned on. The initial mixture inside the first reactor 5 is injected into the second reactor 5 through the injection pump 9. CHCl3 liquid is injected into the second reactor 5 through the liquid injector 6. A certain amount of EtAlCl2 solid and FeCl3 solid are injected into the second reactor 5 through the solid injector 7. The mixture is stirred and mixed to obtain mixture I. Nitrogen gas overflows and is discharged into the air during injection.

[0072] The stirring component of the third reactor 5 is turned on, and the No. I mixture inside the second reactor 5 is injected into the third reactor 5 through the injection pump 9. 1-decene liquid is added dropwise into the third reactor 5 through the dripping mechanism 8. After stirring and mixing, the No. II mixture is obtained. Nitrogen gas overflows during injection and is discharged into the air.

[0073] Neutral cleaning: Water and sodium hydroxide solid were injected into the third reactor 5 one after the other to obtain an aqueous sodium hydroxide solution;

[0074] The mixture II from the third reactor 5 is injected into the cleaning tank through the injection pump 9 and washed until neutral to obtain the washing liquid.

[0075] The washing liquid inside the cleaning tank 11 is injected into the distillation unit 13 by the injection pump 9 for vacuum distillation to remove the solvent and unreacted 1-decene. The heavy components are collected to obtain the base fluid for synthetic drilling fluid.

[0076] Several lifting lugs 15 are fixed on both sides of the skid-mounted base 1. The hot water circulation mechanism includes a hot water tank 10 and a heater 12. The hot water tank 10 is fixed on the skid-mounted base 1. The heater 12 is installed on the hot water tank 10. A hot water pump is installed on the hot water tank 10. The outlet of the hot water pump is equipped with a multi-port connector. The multi-port connector is connected to the corresponding circulating hot water cover 4 through water pipes. Each water pipe is equipped with an electric control valve.

[0077] The lifting lug 15 facilitates the lifting of this device, making it easy to load, unload, and move. The heater 12 heats the clean water inside the hot water tank 10 to obtain hot water. The hot water pump injects the hot water into the corresponding circulating hot water hood 4 through the multi-port connector to ensure the reaction temperature of the reactor 5. The electric control valve is used to control the water injection volume.

[0078] The liquid feeder 6 includes a fixed base 49, which is fixed to the upper end of the mounting frame 2. A distributor 22, a retracting push rod 50, and a piston discharge pipe 51 are fixed to the upper end of the fixed base 49. The telescopic end of the retracting push rod 50 is fixedly connected to the piston rod of the piston discharge pipe 51. The distributor 22 and the piston discharge pipe 51 are connected. A connecting rod 21 is fixed to the end of the feed rod of the distributor 22. A feed push rod 26 is hinged between the end of the connecting rod 21 and the fixed base 49. A liquid hopper 48 is fixedly connected to the upper end of the distributor 22. A liquid outlet valve 24 is fixedly connected to the side of the distributor 22. A liquid outlet push rod 25 is fixedly connected to the upper end of the liquid outlet valve 24. The telescopic end of the liquid outlet push rod 25 is fixedly connected to the valve stem of the liquid outlet valve 24. A liquid outlet pipe 23 is provided at the lower end of the liquid outlet valve 24. The liquid outlet pipe 23 is connected to the feed pipe of the corresponding reaction vessel 5 through a pipe.

[0079] Liquid raw materials are injected into the liquid hopper 48. The feeding push rod 26 cooperates with the connecting rod 21 to move the feeding rod, connecting the liquid hopper 48 to the distributor 22 and the piston discharge pipe 51. The telescopic end of the push rod 50 is retracted to pull the piston rod of the piston discharge pipe 51 outward, and the liquid raw materials are injected into the piston discharge pipe 51. The feeding push rod 26 cooperates with the connecting rod 21 to move the feeding rod, connecting the liquid discharge valve 24 to the distributor 22 and the piston discharge pipe 51. The telescopic end of the liquid discharge push rod 25 pulls the valve rod of the liquid discharge valve 24 to adjust the liquid discharge rate. The telescopic end of the push rod 50 is retracted to push the piston rod of the piston discharge pipe 51 inward, and the liquid raw materials are injected into the liquid discharge valve 24 and discharged from the liquid discharge pipe 23. The liquid raw materials then enter the interior of the reactor 5 through the feed pipe of the reactor 5.

[0080] The solid feeder 7 includes a housing 27, which is fixed to the upper end of the mounting frame 2. A fixing rod 28 is fixed to the housing 27, and a solid material hopper 29 is fixed to the side of the fixing rod 28. A guide pipe 30 is provided at the lower end of the solid material hopper 29. A rotating shaft is rotatably provided at the upper end of the housing 27, and a connecting plate 35 is fixed to the upper end of the housing 27. The rotating shaft passes through the center of the connecting plate 35, and a turntable 31 is fixed to the upper end of the rotating shaft. Several circumferentially distributed metering sleeves 32 are provided at the lower end of the turntable 31. One metering sleeve 32 is located directly below the guide pipe 30, and the lower end face of the guide pipe 30 abuts against the turntable 31. Springs 36 are fitted on the outside of each metering sleeve 32. The upper and lower ends of the spring 36 abut against the turntable 31 and the metering sleeve 32 respectively. The lower end face of the metering sleeve 32 abuts against the upper end face of the connecting plate 35. The lower end of the connecting plate 35 is provided with one of the metering sleeves 32 located directly above the discharge pipe 34. The discharge pipe 34 is connected to the feed pipe of the corresponding reactor 5 through a pipe. The discharge motor 39 and the regulator 40 are fixed inside the machine housing 27. A pulley pair 38 is provided between the output shaft of the discharge motor 39 and the input shaft of the regulator 40. The upper end of the output shaft of the regulator 40 is fixed with a drive gear 41, and the lower end of the rotating shaft is fixed with a driven gear 37. The driven gear 37 meshes with the drive gear 41.

[0081] Solid granular material is poured into the solid hopper 29 and falls into the guide pipe 30, then into the metering sleeve 32. The output shaft of the discharge motor 39 drives the input shaft of the regulator 40 to rotate intermittently through the pulley pair 38. The output shaft of the regulator 40 drives the drive gear 41 to rotate intermittently. The driven gear 37 meshes with the drive gear 41, driving the driven gear 37 to rotate intermittently, thus causing the turntable 31 to rotate intermittently. The lower end face of the metering sleeve 32 abuts against the upper end face of the connecting plate 35 and rotates intermittently, rotating the discharge pipe 34. The solid granular material inside the metering sleeve 32 falls into the discharge pipe 34 and enters the reactor 5 through the feed pipe of the reactor 5.

[0082] The dripping mechanism 8 includes several mounting rods 47, which are fixed to the upper end of the mounting frame 2. Each mounting rod 47 has a second adjusting push rod 46 fixed to its upper end. A fixing rod 45 is fixed to the telescopic end of the second adjusting push rod 46. A first connecting seat 44 is adjustablely provided on the fixing rod 45. An adjusting push rod 43 is provided on the first connecting seat 44. A dripping tube 42 is fixed to the telescopic end of the adjusting push rod 43. The dripping tube 42 is directly above the feed pipe of the corresponding reaction vessel 5.

[0083] The telescopic end of the second adjusting push rod 46 drives the fixed rod 45 to move, thereby adjusting the position of the outlet of the dripping tube 42. The telescopic end of the adjusting push rod 43 drives the dripping tube 42 to move, thereby adjusting the angle of the outlet of the dripping tube 42 so that the dripping tube 42 is directly above the feed pipe of the corresponding reactor 5.

[0084] The distillation unit 13 includes a liquefied gas tank 14, a heating vaporization tank 16, a condenser 17, a circulation pump 18, a receiving box 19, and a collection bottle 20. The liquefied gas tank 14, the heating vaporization tank 16, the condenser 17, the circulation pump 18, and the receiving box 19 are all fixed to the upper end of the skid-mounted base 1. The collection bottle 20 is placed on the upper end of the skid-mounted base 1 and is located below the light component pipe of the condenser 17. The condenser 17 is connected to the cleaning tank 11 through a pipe. The liquefied gas tank 14 is connected to the heating vaporization tank 16 through a pipe. The heating vaporization tank 16 is connected to the condenser 17 through a pipe. The condenser 17 is connected to the receiving box 19 through a pipe. The circulation pump 18 is connected to the condenser 17 and the receiving box 19 through pipes.

[0085] The liquefied gas tank 14 provides liquefied gas to the heating vaporization tank 16. The heating vaporization tank 16 distills the neutral washing liquid under reduced pressure to obtain gas. The gas enters the condenser 17 for condensation treatment. The condensed light components flow out from the light component pipe and are collected in the collection bottle 20 to remove the solvent and unreacted 1-decene. The heavy components are introduced into the receiving box 19 to obtain the base fluid for synthetic drilling fluid. The circulation pump 18 re-injects the receiving box 19 into the condenser 17 for repeated condensation to ensure the purity of the base fluid for synthetic drilling fluid.

[0086] In summary, by using three reaction vessels 5 in conjunction with the injection pump 9, a continuous stirring and mixing process is achieved, resulting in high mixing efficiency and fast reaction speed.

[0087] The reaction temperature of the reactor 5 is controlled by the hot water circulation mechanism in conjunction with the circulating hot water cover 4, thus ensuring the reaction effect.

[0088] Liquid raw materials are quantitatively injected through liquid feeder 6, solid raw materials are quantitatively injected through solid feeder 7, and initiator is quantitatively added through dripping mechanism 8 to ensure accurate proportion of each material.

[0089] The components are integrated and installed on the skid-mounted base 1, which facilitates the lifting of the device and makes it easy to load, unload and move.

[0090] Stable and efficient vacuum distillation is performed through distillation unit 13 to remove solvent and unreacted 1-decene, and heavy components are collected to obtain a high-purity synthetic drilling fluid base fluid.

[0091] Example 1

[0092] Step 1, Production Preparation: Clean up the production site, determine the product process and formula, check whether the machinery and equipment can operate normally, and prepare raw materials according to the proportions.

[0093] Step 2, Preliminary Mixing: Nitrogen generator 3 prepares nitrogen gas, which is injected into the first, second, and third reactors 5 to replace the oxygen inside them. The stirring component of the first reactor 5 is activated, and a fixed amount of C10 α-olefin liquid and cyclohexane liquid is injected into the first reactor 5 through two liquid feeders 6, i.e., the liquid raw materials are injected into the liquid hopper 48. The feed pusher 26 cooperates with the connecting rod 21 to push the feed rod, connecting the liquid hopper 48 to the distributor 22 and the piston discharge pipe 51. The pusher 50 is then closed. The telescopic end pulls the piston rod of the piston discharge pipe 51 outward, and the liquid raw material is injected into the piston discharge pipe 51. The feeding push rod 26 cooperates with the connecting rod 21 to push the feeding rod. The liquid discharge valve 24 is connected to the distributor 22 and the piston discharge pipe 51. The telescopic end of the liquid discharge push rod 25 pulls the valve rod of the liquid discharge valve 24 to adjust the liquid discharge volume. The telescopic end of the push rod 50 is closed to push the piston rod of the piston discharge pipe 51 inward, and the liquid raw material is injected into the liquid discharge valve 24 and discharged from the liquid discharge pipe 23. It enters the interior of the reactor 5 through the feed pipe of the reactor 5, is stirred and mixed to obtain a preliminary mixed liquid. Nitrogen gas overflows during injection and is discharged into the air.

[0094] Step 3, Primary Mixing: The stirring component of the second reactor 5 is activated. The initial mixture from the first reactor 5 is injected into the second reactor 5 via the injection pump 9. CHCl3 liquid is injected into the second reactor 5 via the liquid injector 6, and a measured amount of EtAlCl2 and FeCl3 solids are injected into the second reactor 5 via the solid injector 7. The solid granules are poured into the solid hopper 29 and fall into the guide pipe 30, then into the metering sleeve 32. The output shaft of the discharge motor 39 is connected via a belt... The gear pair 38 drives the input shaft of the regulator 40 to rotate intermittently, and the output shaft of the regulator 40 drives the drive gear 41 to rotate intermittently. The driven gear 37 meshes with the drive gear 41, driving the driven gear 37 to rotate intermittently, thereby causing the turntable 31 to rotate intermittently. The lower end face of the metering sleeve 32 abuts against the upper end face of the connecting plate 35 and rotates intermittently. The solid granular material inside the metering sleeve 32 falls into the discharge pipe 34 and enters the reactor 5 through the feed pipe of the reactor 5. It is stirred and mixed to obtain the No. I mixture. Nitrogen gas overflows during injection and is discharged into the air.

[0095] Step 4, Secondary Mixing: The stirring component of the third reactor 5 is turned on. The No. I mixture inside the second reactor 5 is injected into the third reactor 5 through the injection pump 9. The telescopic end of the second adjusting push rod 46 drives the fixed rod 45 to move, thereby adjusting the position of the outlet of the dripping tube 42. The telescopic end of the adjusting push rod 43 drives the dripping tube 42 to move, thereby adjusting the angle of the outlet of the dripping tube 42 so that the dripping tube 42 is directly above the feed pipe of the corresponding reactor 5. 1-decene liquid is dripped into the third reactor 5 through the dripping tube 42. After stirring and mixing, No. II mixture is obtained. Nitrogen gas overflows during injection and is discharged into the air.

[0096] Step 5, Neutral cleaning: Water and sodium hydroxide solid are injected into the third reaction vessel 5 in sequence to obtain sodium hydroxide aqueous solution;

[0097] The mixture II from the third reactor 5 is injected into the cleaning tank through the injection pump 9 and washed until neutral to obtain the washing liquid.

[0098] Step 6, vacuum distillation: The washing liquid inside the washing tank 11 is injected into the distillation mechanism 13 by the injection pump 9. The liquefied gas tank 14 provides liquefied gas to the heating vaporization tank 16. The heating vaporization tank 16 distills the neutral washing liquid under vacuum to obtain gas. The gas enters the condenser 17 for condensation treatment. The condensed light components flow out from the light component pipe and are collected in the collection bottle 20 to remove the solvent and unreacted 1-decene. The heavy components are introduced into the receiving box 19 to obtain the base liquid for synthetic drilling fluid. The circulation pump 18 injects the receiving box 19 back into the condenser 17 for repeated condensation to ensure the purity of the base liquid for synthetic drilling fluid.

[0099] The technical requirements for the base fluid used in synthetic drilling fluids are shown in Table 1.

[0100] project Technical indicators Appearance Colorless and transparent flowing liquid <![CDATA[Density, g / cm 3 > 0.70-0.90 Pour point, ℃ ≤15.0 Flash point, °C ≥45 Fluorescence level, grade ≤5

[0101] Table 1 Technical Specifications of Base Fluids for Synthetic Drilling Fluids

[0102] I. Instruments and Materials

[0103] 1.1 Instruments and Equipment

[0104] The following instruments and equipment were used in the experiment:

[0105] 1.1.a. High-speed stirrer: The speed under load is 11000r / min±300r / min. The stirring shaft is equipped with a single wave-shaped blade with a diameter of 2.5cm and a mass of 5.5g. It is equipped with a sample cup with a height of 18cm, an upper diameter of 9.7cm and a lower diameter of 7.0cm. It is made of stainless steel or corrosion-resistant material.

[0106] 1.1.b. Electronic balance: scale division 0.01g;

[0107] 1.1.c. Six-speed rotational viscometer; Fann-35SA or similar product;

[0108] 1.1.d. Heating roller furnace: GW300-PLC or similar product, temperature control sensitivity ±2℃;

[0109] 1.1.e. High-temperature and high-pressure filtration loss meter: OFITE-171-01 or similar product;

[0110] 1.1.f. Electrical stability tester: Fann-23D or similar product;

[0111] 1.1g; graduated cylinders: 10mL, 25mL, 500mL;

[0112] 1.1.h. Freezing point apparatus: Manual freezing point apparatus or similar product;

[0113] 1.1.i. Density measuring instrument: Baumé hydrometer;

[0114] 1.1.j Flash point tester: Open-cup flash point or closed-cup flash point tester;

[0115] 1.1.k Fluorometer: Geological fluorescence instrument or similar product;

[0116] 1.1.1. Thermometer: Range: -20℃ to 50℃, scale division 0.1℃.

[0117] 1.2 Reagents and Materials

[0118] The following reagents and materials were used in the experiment:

[0119] 1.2.a. Distilled water: Meets the Class III requirements of GB / T6682;

[0120] 1.2.b Chloroform: Analytical grade.

[0121] II. Test Methods

[0122] 2.1 Appearance

[0123] Weigh approximately 20.0g of the sample and place it in a 100mL stoppered test tube. Visually inspect the sample under bright natural light, then invert the test tube to observe its flowability.

[0124] 2.2 Density Measurement

[0125] The density was determined according to the requirements of Test Method A - Densitometer Method in GB / T2013-2010 Determination of Density of Liquid Petrochemical Products.

[0126] 2.3 Determination of freezing point

[0127] The test shall be performed according to the requirements of the manual pour point tester in GB / T510-2018 Petroleum Products Deposition Method.

[0128] 2.4 Flash Point Determination

[0129] The flash point and ignition point of petroleum products shall be determined according to the requirements of section 3.1 of GB / T3536-2008, Cleveland open cup method.

[0130] 2.5 Determination of Fluorescence Level

[0131] Add 20 mL of chloroform to a clean, dry 100 mL beaker, add 1.0 g of the sample whose fluorescence level needs to be determined, shake well, let stand, and let it clarify. Pour 10-15 mL of the clarified liquid into a clean test tube, observe the fluorescence under a geological fluorescence spectrometer, and compare it with relevant standard series to determine the fluorescence level.

[0132] III. Inspection Rules

[0133] 3.1 Factory Inspection

[0134] Each batch of products should be inspected before leaving the factory. The inspection items are all the technical indicators listed in Table 1.

[0135] 3.2 Sampling Method

[0136] Samples were taken from 5% of the total number of containers. During sampling, a sampler was used to collect samples from the top, middle, and bottom of the container. After sampling, the product was thoroughly shaken and divided into two clean, dry, stoppered reagent bottles. The bottles were sealed and labeled with the manufacturer's name, product name, batch number, sampling date, and sampler's name. One bottle was sent for testing, and the other was kept for retesting.

[0137] 3.3 Type Testing

[0138] Type testing shall be conducted under any of the following circumstances;

[0139] 3.3.a. During product type approval and evaluation;

[0140] 3.3.b. When changes occur in the raw materials or processes of the product, affecting the product's performance;

[0141] 3.3.c. When producing 30 tons of product;

[0142] 3.3.d. When the quality supervision department makes an inspection request;

[0143] 3.3.e. When production needs to be resumed after a six-month hiatus.

[0144] 3.4 Judgment Rules

[0145] The manufacturer shall ensure that each batch of products leaving the factory meets the requirements of this standard. Sampling shall be carried out according to the sampling method and the test methods specified in this standard. If any technical indicator is found to be non-compliant with this standard, the sampling shall be doubled for retesting. If the retest results still do not meet this standard, the product is considered non-compliant.

[0146] IV. Marking, Packaging, Storage and Transportation

[0147] 4.1 Signs

[0148] The packaging should indicate the product name, trademark, implementation standard, and net weight, and the bottom of the container should indicate the manufacturer's name, batch number, production date, and expiration date.

[0149] 4.2 Packaging

[0150] This product should be packaged in clean, dry, and sealed plastic or metal drums.

[0151] 4.3 Storage and Transportation

[0152] The product should be stored in a well-ventilated, dry place, away from prolonged direct sunlight. Protect it from rain during transportation and avoid severe impacts that could damage the packaging.

[0153] V. Health, Safety and Environmental Protection Requirements

[0154] 5.1 The supplier of this product shall provide safety advice or corresponding safety technical specifications regarding its hazards.

[0155] 5.2 The production, transportation and use of the product shall strictly comply with the relevant national and local laws and regulations on safety and environmental protection.

[0156] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A method for processing a base fluid for synthetic drilling fluids, characterized in that, The processing steps include the following: Step 1, Production Preparation: Clean up the production site, determine the product process and formula, check whether the machinery and equipment can operate normally, and prepare raw materials according to the proportions. Step 2, preliminary mixing: Nitrogen gas is generated by a nitrogen generator and injected into the first, second, and third reaction vessels to replace the oxygen inside them. The stirring component of the first reaction vessel is turned on, and a fixed amount of C10 α-olefin liquid and cyclohexane liquid are injected into the first reaction vessel through two liquid injectors. The mixture is stirred and mixed to obtain a preliminary mixture. During the injection, nitrogen gas overflows and is released into the air. Step 3, primary mixing: The stirring component of the second reactor is turned on, and the preliminary mixture inside the first reactor is injected into the second reactor through the injection pump. CHCl3 liquid is injected into the second reactor through the liquid injector, and a certain amount of EtAlCl2 solid and FeCl3 solid are injected into the second reactor through the solid injector. The mixture is stirred and mixed to obtain mixture I. Nitrogen gas overflows during injection and is discharged into the air. Step 4, secondary mixing: The stirring component of the third reactor is turned on, and the No. I mixture inside the second reactor is injected into the third reactor through the injection pump. 1-decene liquid is added dropwise into the third reactor through the dripping mechanism. The mixture is stirred and mixed to obtain the No. II mixture. Nitrogen gas overflows during injection and is discharged into the air. Step 5, Neutral cleaning: Water and sodium hydroxide solid are injected into the third reaction vessel in sequence to obtain sodium hydroxide aqueous solution; The mixture from reactor II in the third reactor is injected into the washing tank using a feed pump and washed until neutral to obtain a washing solution. Step 6, vacuum distillation: The washing liquid inside the cleaning tank is injected into the distillation unit through the injection pump to carry out vacuum distillation, remove the solvent and unreacted 1-decene, collect the heavy components, and obtain the base fluid for synthetic drilling fluid.

2. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step two, the weight ratio of C10 α-olefin liquid to cyclohexane liquid is 5:

1.

3. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step three, the weight mixing ratio of CHCl3 liquid, EtAlCl2 solid, and FeCl3 solid is 120:25:

1.

4. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step four, the weight mixing ratio of mixture I and 1-decene liquid is 1:

2.

5. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step five, the sodium hydroxide aqueous solution is a 10% sodium hydroxide aqueous solution.

6. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step two, the first, second, and third reactors are connected to the hot water circulation mechanism via pipes. The reaction temperature of the first reactor is 25°C, the reaction temperature of the second reactor is 60°C, and the reaction temperature of the third reactor is 40°C.

7. The processing method for a synthetic-based drilling fluid base fluid according to claim 1, characterized in that, In step four, the 1-decene liquid was added dropwise over 15 minutes, and the stirring reaction time was 60 minutes.

8. An auxiliary emulsifier for synthetic-based drilling fluids, comprising a synthetic-based drilling fluid base fluid prepared by the processing method of the synthetic-based drilling fluid base fluid according to any one of claims 1-7.

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