Homogeneous well killing fluid treatment device

Abstract

The homogeneous well killing fluid treatment device comprises a first-stage treatment tank, one side of the first-stage treatment tank abuts against a second-stage treatment tank, the other side of the first-stage treatment tank is communicated with a blowdown device, the bottom of the first-stage treatment tank and the bottom of the second-stage treatment tank are both in a funnel shape, and the top, away from the second-stage treatment tank, of the first-stage treatment tank is communicated with a liquid feeding assembly. The tops, close to each other, of the primary treatment tank and the secondary treatment tank are communicated with spiral material conveyors respectively, stirring devices are mounted in the centers of the tops of the primary treatment tank and the secondary treatment tank respectively, and the lower part of the primary treatment tank and the lower part of the secondary treatment tank are jointly communicated with a liquid discharging assembly and an external conveying assembly. According to the homogeneous well killing fluid treatment device, the functions of homogeneous well killing fluid preparation, homogeneous well killing fluid supplement, well killing throttling regulation and control, recovery and purification treatment and solid and liquid waste separation type cleaning treatment are achieved, the functions are integrated, and the problems that an existing homogeneous well killing fluid treatment device is large in number and complex in operation are solved.

Description

Technical Field

[0001] This invention belongs to the field of oilfield well workover equipment technology, specifically relating to a homogeneous well control fluid treatment device. Background Technology

[0002] Well workover operations are the core of daily production, management, and optimization maintenance of oil, gas, and water wells, spanning the entire lifecycle of oil and gas field development. The work is demanding, involves a vast operational system, and requires a large workforce. Currently, the main well workover techniques employed are pressurized well workover, balanced pressure well workover, and atmospheric pressure well workover after depressurization.

[0003] Live well workover, also known as pressurized well workover, involves plugging the tubing at the wellhead while it is pressurized, and then performing downhole operations using live well workover equipment. Compared to traditional downhole operations, it has advantages such as no blowouts or overflows, minimal formation damage, and no loss of formation energy. However, it also has disadvantages such as high equipment and process requirements, complex operation, long operation cycle, high cost, and inability to operate in winter. Depressurized well workover at atmospheric pressure, on the other hand, has disadvantages such as the difficulty of depressurizing high-pressure wells, large volume of flowback fluid to handle, and loss of formation energy during depressurization. The homogeneous phase kill fluid recirculation well workover technology involves injecting high-density homogeneous kill fluid into the wellbore to balance the pressure. Workover is performed after the wellhead overflows, and the homogeneous kill fluid is then recycled after completion. Compared to conventional well workover operations at atmospheric pressure after depressurization, this technology avoids formation energy loss caused by depressurization, reduces the amount of flowback fluid to be handled, and avoids the impact of depressurization on the operation schedule. Compared to live-line operations, this process uses simpler equipment, is easier to operate, has lower operating costs, a shorter operation cycle, and avoids the problems of workover failure due to plugging failure or the difficulty of wellbore treatment after a live-line operation failure. This technology has significant application value in high-pressure water injection well operations where depressurization is challenging.

[0004] Existing technologies for controlled pressure workover using recycled homogeneous kill fluid suffer from several drawbacks. First, the preparation of homogeneous kill fluid is inefficient, time-consuming, and labor-intensive. Second, the backflow rate is controlled by adjusting wellhead valves during pressure balancing, which is difficult to manage. Third, the recycling and reprocessing of homogeneous kill fluid requires manual handling of chemicals and manual density measurement, making monitoring challenging. Fourth, filtration and purification of homogeneous kill fluid can easily cause filter blockage and prevent solid-liquid separation of waste, making online purification of the recovered homogeneous kill fluid impossible. Finally, existing technologies for controlled pressure workover using recycled homogeneous kill fluid involve numerous equipment such as mixing devices, purification devices, choke manifolds, and pipeline pumps, resulting in complex operation, large footprint, and significant transportation workload. Summary of the Invention

[0005] The purpose of this invention is to provide a homogeneous well control fluid treatment device, which solves the problems of existing homogeneous well control fluid treatment equipment being numerous and complex to operate.

[0006] The technical solution adopted in this invention is a homogeneous well-killing fluid treatment device, including a primary treatment tank, a secondary treatment tank abutting one side of the primary treatment tank, and a sludge discharge device connected to the other side of the primary treatment tank. The bottoms of both the primary and secondary treatment tanks are funnel-shaped. A fluid inlet assembly is connected to the top of the primary treatment tank away from the secondary treatment tank. Spiral material conveyors are connected to the tops of the primary and secondary treatment tanks that are close to each other. A stirring device is installed at the center of the top of the primary and secondary treatment tanks respectively. A fluid discharge assembly and an external conveying assembly are connected to the lower parts of the primary and secondary treatment tanks. The fluid discharge assembly is connected to the sludge discharge device. A solid waste treatment device is placed below the primary treatment tank, the secondary treatment tank, and the sludge discharge device.

[0007] The invention is further characterized by: The screw conveyor is electrically connected to an electrical control cabinet, which is electrically connected to the mixing device and the external conveying components.

[0008] Overflow ports are respectively opened on the upper part of the side where the primary treatment tank and the secondary treatment tank are in contact with each other. The primary treatment tank and the secondary treatment tank are connected through the two overflow ports. An oil separator baffle is fixedly installed inside the primary treatment tank near the overflow port. The bottom of the overflow port is flush with the middle of the oil separator baffle. A basket grid is fixedly installed inside the secondary treatment tank near the overflow port. A level gauge is fixedly connected to one side of the primary treatment tank and the secondary treatment tank respectively. A ball valve is installed at the bottom of each level gauge. A density meter is fixedly connected to one side of the primary treatment tank and the secondary treatment tank respectively.

[0009] The bottom ends of the two level gauges extend into the primary and secondary treatment tanks, respectively, and one end of each of the two density gauges extends into the primary and secondary treatment tanks, respectively.

[0010] The mixing device includes mixers, each with a central rotating shaft installed at its bottom. The two mixers are fixedly connected to the top center of the primary and secondary treatment tanks, respectively. The two central rotating shafts extend into the primary and secondary treatment tanks, respectively. Several mixing blades are fixedly connected to the central rotating shafts. The mixers are electrically connected to the electrical control cabinet.

[0011] The external output component includes an external output pipeline. One end of the external output pipeline is connected to the lower part of the secondary treatment tank, and the other end of the external output pipeline has an external output port. The middle part of the external output pipeline is connected to the primary treatment tank. External output valves are installed near the primary treatment tank and the secondary treatment tank respectively. An external output main control valve and a pipeline pump are installed in sequence near the external output port of the external output pipeline. The pipeline pump is electrically connected to the electrical control cabinet.

[0012] The liquid inlet assembly includes an inlet pipe, one end of which is connected to the top of the primary treatment tank away from the secondary treatment tank. The other end of the inlet pipe has an inlet, and a bypass pipe is connected in the middle of the inlet pipe. The other end of the bypass pipe has a bypass outlet, and a bypass outlet valve is installed in the middle of the bypass pipe. From the end of the inlet pipe closest to the inlet, an inlet shut-off valve, a pressure gauge, a throttle valve, and a mass flow sensor are installed in sequence. An inlet control valve is installed near the primary treatment tank on the inlet pipe.

[0013] The sewage discharge device includes a sewage discharge tank with a funnel-shaped bottom. The sewage discharge tank and the primary treatment tank are connected by an oil discharge pipe. The connection point between the oil discharge pipe and the primary treatment tank is higher than the lower edge of the oil separator. An oil discharge valve is installed in the middle of the oil discharge pipe. The sewage discharge tank is connected to the liquid discharge assembly. A solid waste treatment device is placed below the sewage discharge tank.

[0014] The drainage assembly includes a drainage pipe. One end of the drainage pipe is connected to the lower part of the secondary treatment tank, and the other end of the drainage pipe has a drainage outlet. The middle part of the drainage pipe is connected to the lower part of the primary treatment tank and the lower part of the sludge tank. Liquid drainage valves are installed near the primary treatment tank and the secondary treatment tank. A sludge tank control valve is installed near the sludge tank. A main drainage outlet valve is installed near the drainage outlet of the drainage pipe.

[0015] Solid waste discharge valves are installed at the bottom of the primary treatment tank, secondary treatment tank and waste discharge tank respectively.

[0016] The beneficial effects of this invention are: The homogeneous kill fluid treatment device of the present invention realizes the functions of preparing homogeneous kill fluid, replenishing homogeneous kill fluid during operation, controlling kill flow and throttling, online recovery and purification treatment, and solid and liquid waste separation and cleaning treatment. At the same time, it integrates these functions into a set of devices, solving the problems of existing homogeneous kill fluid treatment devices that have many devices and complex operation. It is comprehensive in function, safe and environmentally friendly, with a reasonable layout and convenient operation, simplifying on-site equipment and improving work efficiency. Attached Figure Description

[0017] Figure 1 This is a top view of the homogeneous well-killing fluid treatment device of the present invention; Figure 2 For the present invention Figure 1 View from direction A; Figure 3 For the present invention Figure 1 View from direction B; Figure 4 For the present invention Figure 1 The C-direction view.

[0018] In the diagram: 1. Primary treatment tank, 2. Secondary treatment tank, 3. Sewage tank, 4. Inlet shut-off valve, 5. Throttling valve, 6. Mass flow sensor, 7. Inlet pipe, 8. Agitator, 9. Oil separator, 10. Overflow port, 11. Basket grille, 12. Oil drain valve, 13. Drain pipe, 14. Screw conveyor, 15. Pipeline pump, 16. Electrical control cabinet, 17. External pipeline, 18. Densitometer, 19. Level gauge, 20. Pressure gauge, 21. Inlet liquid Imported, 23. Solid waste treatment device, 24. Ball valve, 25. Solid waste discharge valve, 26. External discharge valve, 27. Liquid discharge valve, 28. Discharge outlet, 29. External outlet, 30. Incoming liquid bypass pipeline, 31. Incoming liquid bypass outlet, 32. Incoming liquid bypass outlet valve, 33. Main discharge outlet valve, 34. Main external discharge control valve, 35. Incoming liquid control valve, 36. Central shaft of mixer, 37. Mixing blades, 38. Oil discharge outlet, 39. Wastewater tank control valve. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Homogeneous well-killing fluid treatment devices, such as Figure 1 As shown, the system includes a primary treatment tank 1, a secondary treatment tank 2 connected to one side of the primary treatment tank 1, and a sludge discharge device connected to the other side of the primary treatment tank 1. Both the primary treatment tank 1 and the secondary treatment tank 2 have funnel-shaped bottoms. A liquid inlet assembly is connected to the top of the primary treatment tank 1, away from the secondary treatment tank 2. Spiral material conveyors 14 are connected to the tops of the primary treatment tank 1 and the secondary treatment tank 2, which are close to each other. A stirring device is installed at the center of the top of both the primary treatment tank 1 and the secondary treatment tank 2. A sludge discharge assembly and an external conveying assembly are connected to the lower parts of both the primary treatment tank 1 and the secondary treatment tank 2. Figure 2 As shown, the liquid discharge assembly is connected to the sewage discharge device, and solid waste treatment devices 23 are placed below the primary treatment tank 1, the secondary treatment tank 2 and the sewage discharge device, respectively.

[0021] The screw conveyor 14 is electrically connected to an electrical control cabinet 16, which is electrically connected to the mixing device and the external conveying component.

[0022] like Figure 3As shown, overflow ports 10 are respectively provided on the upper part of the side where the primary treatment tank 1 and the secondary treatment tank 2 are in contact with each other. The primary treatment tank 1 and the secondary treatment tank 2 are connected through the two overflow ports 10. An oil separator baffle 9 is fixedly installed inside the primary treatment tank 1 near the overflow port 10. The bottom of the overflow port 10 is flush with the middle of the oil separator baffle 9. A basket grid 11 is fixedly installed inside the secondary treatment tank 2 near the overflow port 10. A level gauge 19 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively. A ball valve 24 is installed at the bottom of each level gauge 19. A density meter 18 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively.

[0023] The bottom ends of the two level gauges 19 extend into the primary treatment tank 1 and the secondary treatment tank 2, respectively, and one end of the two density gauges 18 extends into the primary treatment tank 1 and the secondary treatment tank 2, respectively.

[0024] The mixing device includes a mixer 8, each mixer 8 having a central rotating shaft 36 installed at its bottom. The two mixers 8 are respectively fixed to the top center of the primary treatment tank 1 and the secondary treatment tank 2. The two central rotating shafts 36 extend into the interior of the primary treatment tank 1 and the secondary treatment tank 2, respectively. Several mixing blades 37 are fixed on the central rotating shafts 36. The mixers 8 are electrically connected to the electrical control cabinet 16.

[0025] like Figure 4 As shown, the external output assembly includes an external output pipeline 17. One end of the external output pipeline 17 is connected to the lower part of the secondary treatment tank 2, and the other end of the external output pipeline 17 has an external output port 29. The middle part of the external output pipeline 17 is connected to the primary treatment tank 1. External output valves 26 are installed near the primary treatment tank 1 and the secondary treatment tank 2, respectively. An external output main control valve 34 and a pipeline pump 15 are installed in sequence near the external output port 29 of the external output pipeline 17. The pipeline pump 15 is electrically connected to the electrical control cabinet 16.

[0026] The liquid inlet assembly includes a liquid inlet pipe 7. One end of the liquid inlet pipe 7 is connected to the top of the primary treatment tank 1 away from the secondary treatment tank 2. The other end of the liquid inlet pipe 7 is provided with a liquid inlet 21. A liquid inlet bypass pipe 30 is connected in the middle of the liquid inlet pipe 7. A liquid inlet bypass outlet 31 is provided at the other end of the liquid inlet bypass pipe 30. A liquid inlet bypass outlet valve 32 is installed in the middle of the liquid inlet bypass pipe 30. A liquid inlet shut-off valve 4, a pressure gauge 20, a throttle valve 5 and a mass flow sensor 6 are installed sequentially from the end of the liquid inlet pipe 7 near the liquid inlet 21. A liquid inlet control valve 35 is installed near the primary treatment tank 1 on the liquid inlet pipe 7.

[0027] The sewage discharge device includes a sewage discharge tank 3, which has a funnel-shaped bottom. The sewage discharge tank 3 and the primary treatment tank 1 are connected by an oil discharge pipe 38. The connection point between the oil discharge pipe 38 and the primary treatment tank 1 is higher than the lower edge of the oil separator baffle 9. An oil discharge valve 12 is installed in the middle of the oil discharge pipe 38. The sewage discharge tank 3 is connected to the liquid discharge assembly. A solid waste treatment device 23 is placed below the sewage discharge tank 3.

[0028] The drainage assembly includes a drainage pipe 13, one end of which is connected to the lower part of the secondary treatment tank 2, and the other end of which is provided with a drainage outlet 28. The middle part of the drainage pipe 13 is connected to the lower part of the primary treatment tank 1 and the lower part of the sewage tank 3. Liquid drainage valves 27 are installed near the primary treatment tank 1 and the secondary treatment tank 2. A sewage tank control valve 39 is installed near the sewage tank 3. A main drainage outlet valve 33 is installed near the drainage outlet 28.

[0029] Solid waste discharge valves 25 are installed at the bottom of the primary treatment tank 1, the secondary treatment tank 2, and the waste discharge tank 3.

[0030] The homogeneous well-killing fluid treatment device provided by this invention has the following working process: the base fluid enters through the inlet 21 via an electric submersible pump and is transported to the primary treatment tank 1 and the secondary treatment tank 2 through the inlet pipe 7. Then, chemicals are added to the spiral material conveyor 14, which transports the chemicals to the primary treatment tank 1 and the secondary treatment tank 2. The electrical control cabinet 16 is activated to control the agitator 8 to mix and prepare the fluid. The level gauge 19 and the density meter 18 monitor the primary and secondary treatment tanks in real time. 2. Internal fluid mixing parameters: Once the parameters meet the standards, open the two export valves 26 on the export pipeline 17 that control the export of the primary treatment tank 1 and the secondary treatment tank 2. The homogeneous kill fluid prepared in the primary treatment tank 1 and the secondary treatment tank 2 enters the export pipeline 17 through the export valves 26. Start the electrical control cabinet 16 to control the pipeline pump 15 and open the main export control valve 34. The prepared homogeneous kill fluid is then exported from the export outlet 29 to the storage tank through the main export control valve 34, thus completing the preparation of the homogeneous kill fluid.

[0031] The homogeneous kill fluid is prepared by using the pipeline pump 15 to transport the fluid from the outlet 29 to the storage tank through the outlet pipeline 17.

[0032] During downhole operations, the two liquid discharge valves 27 on the discharge pipeline 13 that control the discharge of the primary treatment tank 1 and the secondary treatment tank 2 are opened. The homogeneous kill fluid inside the primary treatment tank 1 and the secondary treatment tank 2 enters the discharge pipeline 13 through the liquid discharge valves 27 and is measured by the level gauge 19. The main discharge outlet valve 33 is then opened, and the homogeneous kill fluid is transported from the discharge outlet 28 to the wellhead through the main discharge outlet valve 33, completing the replenishment of the homogeneous kill fluid during the operation and replenishing the wellbore fluid periodically and quantitatively.

[0033] During the well control process, the homogeneous well control fluid returned from the well enters the inlet pipe 7 through the inlet fluid inlet 21. The return flow rate of the homogeneous well control fluid is regulated by the throttle valve 5. The density and volume of the homogeneous well control fluid are monitored in real time by the mass flow sensor 6, and the pressure is monitored in real time by the pressure gauge 20. This enables precise control of the homogeneous well control fluid and pressure balance during the well control process.

[0034] Based on the monitored density of the homogeneous kill fluid, the homogeneous kill fluid is diverted. When the density is less than the standard recovery density, the inlet bypass outlet valve 32 is opened, and the homogeneous kill fluid is discharged from the inlet bypass outlet 31 through the inlet bypass outlet valve 32 and transported to the return fluid tank.

[0035] When the density is greater than the standard recovery density, the homogeneous kill fluid enters the primary treatment tank 1 through the inlet control valve 35 for oil removal and first-stage sedimentation. After oil removal and first-stage sedimentation, the homogeneous kill fluid overflows through the overflow port 10 into the secondary treatment tank 2 and is filtered through the basket screen 11. After the second-stage sedimentation, the homogeneous kill fluid is purified. The export valve 26 on the export pipeline 17, which controls the export of the secondary treatment tank 2, is opened. The purified homogeneous kill fluid in the secondary treatment tank 2 enters the export pipeline 17 through the export valve 26. The purified homogeneous kill fluid passes through the pipeline pump 15. The main export control valve 34 is opened, and the purified homogeneous kill fluid is output from the export port 29 to the storage tank through the main export control valve 34, completing the online recovery and purification treatment of the homogeneous kill fluid.

[0036] Open the two liquid drain valves 27 on the drain pipe 13 that control the drainage of primary treatment tank 1 and secondary treatment tank 2. The remaining waste liquid inside primary treatment tank 1 and secondary treatment tank 2 enters the drain pipe 13 through the liquid drain valves 27. Open the sludge tank control valve 39, and the waste liquid is transported to sludge tank 3 through the sludge tank control valve 39. Open the oil drain valve 12, and the sludge oil in primary treatment tank 1 is discharged into sludge tank 3 through the oil drain valve 12. Open the sludge tank control valve 39 and the main drain outlet valve 33. The waste liquid and sludge oil inside sludge tank 3 are discharged and recycled from the external outlet 29 through the drain pipe 13, completing the cleaning treatment of liquid waste.

[0037] Open the solid waste discharge valve 25 at the bottom of the primary treatment tank 1, secondary treatment tank 2 and sewage tank 3. The solid waste at the bottom of the primary treatment tank 1, secondary treatment tank 2 and sewage tank 3 is discharged through the solid waste discharge valve 25 to the solid waste treatment device 23 for recycling, thus completing the cleaning treatment of solid waste.

[0038] Example 1 Objective: To implement pressure control and well workover using a homogeneous well control fluid treatment device that utilizes recycled homogeneous well control fluid.

[0039] Basic parameters: Artificial well bottom depth 2406m, vertical depth of upper edge of perforated section 2194m, daily injection 18m 3 Wellhead pressure 10.4 MPa, cumulative water injection volume 20112 m³ 3 .

[0040] Wellbore condition: No leaks in the casing, good sealing of the tubing string, and unobstructed backwashing channels for the packer.

[0041] Type of kill fluid: High-density homogeneous inorganic kill fluid.

[0042] Design requirements for kill fluid density, volume, and chemical quality: Bottom hole pressure 31.9 MPa, theoretical kill fluid density ρ 理论 =1.48g / cm 3 .

[0043] according to Calculate ρ 实际 , where ρ 理 论 =1.51g / cm 3 h = 100m, calculate ρ 实际 =1.54g / cm 3 .

[0044] The calculated oil pipe volume is 7.2m. 3 The annular volume of the oil sleeve is 18.8 m³. 3 2.9m³ of kill fluid needs to be added. 3 Total volume 28.9m 3 Considering on-site emergency reserves, the actual volume of the prepared kill fluid is calculated as 1.5 times the theoretical volume, resulting in a total on-site prepared kill fluid volume of 43.4 m³. 3 The required quantities of the following chemicals, calculated based on the formula, are: zinc bromide 9543 kg, calcium chloride 10588 kg, sodium nitrate 22892 kg, and water 23.6 m³. 3 HS-3 imidazoline quaternary ammonium salt 248kg.

[0045] 23.6m 3 Clean water should not exceed 6m 3 The chemicals are transported in batches from the inlet 21 via an electric submersible pump and through the inlet pipe 7 to the primary treatment tank 1 and the secondary treatment tank 2. Then, a screw conveyor 14 distributes the chemicals in four batches (chemical ratio: zinc bromide: calcium chloride: sodium nitrate: HS-3 imidazoline quaternary ammonium salt = 1:1.11:2.40:0.03, totaling 9543 kg of zinc bromide, 10588 kg of calcium chloride, 22892 kg of sodium nitrate, and 23.6 m³ of water). 3HS-3 imidazoline quaternary ammonium salt (248 kg) was transported to primary treatment tank 1 and secondary treatment tank 2. The two tanks were prepared simultaneously using a mixer 8. Liquid parameters were monitored in real time by a level gauge 19 and a density meter 18. When the density of the kill fluid in the tank reached 1.54 g / cm³... 3 The solution was then pumped to the storage tank via pipeline pump 15. A total solution with a density of 1.54 g / cm³ was prepared. 3 Homogeneous well-killing fluid 43.4m 3 The volume and density of the kill fluid met the requirements, and the entire fluid preparation process took a total of 8 hours.

[0046] Well control operations: Since the casing was leak-free, the tubing was well-sealed, and the packer backwash channel was unobstructed, a reverse circulation + forward squeeze well method was used to balance the wellbore pressure. This mainly includes three steps: the first step uses 18.8m 3 Reverse circulation throttling was implemented to balance the annular pressure of the casing and tubing during well control. During the well control process, the fluid returning from the wellhead was throttled and stabilized through the inlet throttle valve 5. The density and volume were monitored in real-time by the mass flow sensor 6, and the pressure was monitored in real-time by the pressure gauge 20. The tubing backflow pressure was controlled at 8-10 MPa, and the casing injection pressure was less than 15 MPa. After well control, there was no overflow in the tubing annulus, indicating successful well control via tubing annulus compression. The second step involved positive tubing compression of the well fluid to 10.1 m³. 3 (Equals tubing volume + wellbore volume × 0.1), and the injection pressure is controlled to be less than 15MPa during the operation. In the third step, the well is shut in and the wellbore balance is automatically adjusted. After shutting in the well for 15 minutes, the measured fluid level depth is 52.0m, there is no overflow at the wellhead, and the well control is successful.

[0047] Downhole operations: After installing the wellhead blowout preventer and completing on-site preparations, normal tripping operations were conducted according to the downhole operation procedures. The original well casing was unsealed and tripped. During tripping, fluid was replenished: the fluid drain pipe 13 was connected to the wellhead casing inlet, and the homogeneous fluid in the treatment tank (either primary treatment tank 1 or secondary treatment tank 2) was used to replenish the wellbore fluid periodically and quantitatively, measured by the level gauge 19. The process took 15.5 hours, and 4.3 m³ of homogeneous fluid was replenished. 3 The original well's 252 tubing sections and downhole tools were completely retrieved. A φ118 well gauge and φ73mm tool tubing were run, with fluid level monitored every 50 sections. The well was grouted to the artificial bottom and then retrieved, a process that took 25 hours. A completion string was then run, with fluid level monitored every 50 sections. After 11 hours of running the completion string into position, magnetic positioning and depth calibration were performed. Once the tool positions were confirmed, the wellhead was installed.

[0048] Recovery of kill fluid: The homogeneous liquid was recovered using "pulse-induced jetting and backflow recovery technology." The first step involved injecting 1.5m of clean water into the oil pipe at a high flow rate. 3The pump is stopped after the pressure reaches the set value of 10MPa. The second step involves rapidly releasing pressure from the tubing, repeatedly preparing and purifying the homogeneous kill fluid. During this process, it is observed that the volume of fluid discharged each time is greater than the previous discharge within the same return time period. The third step involves repeating the homogeneous kill fluid preparation and purification process eight times, lasting 2.5 hours. After breaking the wellbore pressure balance and achieving automatic return, the homogeneous kill fluid preparation and purification process is stopped, and the kill fluid is recovered. The kill fluid returned from the well is regulated and stabilized through the inlet throttle valve 5, and the density and volume are monitored in real time by the mass flow sensor 6. When the density exceeds the recovery standard density of 1.2g / m³, the fluid is discharged. 3 Purification and recovery are carried out in a timely manner. When the density is less than 1.2 g / m³, the process is completely changed and discharged to the return fluid tank. Processing flow: The kill fluid enters the primary treatment tank 1 from the inlet pipe 7 for oil removal and primary sedimentation. It overflows through the oil removal overflow port 10 to the secondary treatment tank, where it is filtered by the basket screen 11. After secondary sedimentation, the kill fluid is output to the storage tank through the external control process, achieving a purification and recovery density of 1.51 g / cm³. 3 28m homogeneous liquid 3 When the density is less than 1.2 g / m³ 3 When the inlet bypass outlet valve 32 is opened, the homogeneous kill fluid is discharged from the inlet bypass outlet 31 through the inlet bypass outlet valve 32 and transported to the return fluid tank.

[0049] After the well is sealed by throwing a ball to pressurize it, the site is cleaned up: Liquid waste cleaning and treatment: Oily waste from primary treatment tank 1 is discharged to the sludge tank via drain valve 12. Liquid waste from both primary and secondary treatment tanks is discharged to sludge tank 3 via drain pipe 13. Liquid waste from sludge tank 3 is discharged and recycled via drain pipe 13, with a total of 3.5 m³ of liquid waste recycled and treated. 3 .

[0050] Solid waste clean treatment: Solid waste at the bottom of the primary treatment tank 1, secondary treatment tank 2, and sludge tank 3 is discharged through solid waste discharge valve 25 to the solid waste residue treatment device 23 for recycling, with a total of 0.5m³ of solid waste recycled. 3 .

[0051] Example 2 Objective: To implement pressure control and well workover using a homogeneous well control fluid treatment device that utilizes recycled homogeneous well control fluid.

[0052] Basic parameters: Artificial well bottom depth 2237m, vertical depth of upper edge of perforation section 2134m, daily injection 25m 3 Wellhead pressure 11.2 MPa, cumulative water injection volume 72255 m³ 3 .

[0053] Wellbore condition: No casing rupture or leakage, but there is overflow during casing blowout, and the tubing string seal has failed.

[0054] Type of kill fluid: High-density homogeneous inorganic kill fluid.

[0055] Design requirements for kill fluid density, volume, and chemical quality: Bottom hole pressure 32.1 MPa, theoretical kill fluid density ρ 理论 =1.54g / cm 3 .

[0056] according to Calculate ρ 实际 , where ρ 理 论 =1.51g / cm 3 h = 50m, calculate ρ 实际 =1.57g / cm 3 .

[0057] The calculated oil pipe volume is 6.7m. 3 The annulus volume of the oil jacket is 17.4 m³. 3 2.7m³ of kill fluid needs to be added. 3 Total volume 26.8m 3 Considering on-site emergency reserves, the actual volume of the prepared kill fluid is calculated as 1.5 times the theoretical volume, resulting in a total on-site prepared kill fluid volume of 40.2 m³. 3 .

[0058] The density of the base liquid recovered on-site was 1.52 g / cm³. 3 The total liquid volume is 40m 3 The required amounts of base solution and solute are calculated using the empirical value method: Volume of clear water V 水 Calculate density ρ 配制 =1.57g / cm 3 Volume V 配制 =40.2m 3 When the kill fluid is prepared with clean water, the required volume of clean water is V. 水 =V 配制 / (1m) 3 The density ρ is 1.57 g / cm³ when prepared with water. 3 (volume obtained from kill fluid) Looking up the empirical value table, we get 1m. 3 Prepare 1.57g / cm solution with water. 3 The volume of the kill fluid obtained was 1.99 m³. 3 ; The volume of clear water V was calculated. 水 =20.2m 3 .

[0059] The solution prepared with water has a density ρ = 1.57 g / cm³. 3 ， Volume V 配制=40.2m 3 The amount of each solute in the kill fluid: m 溶质 =Volume of clean water × 1m 3 The density ρ is 1.57 g / cm³ when prepared with water. 3 The required mass of solute for well kill fluid; Looking up the empirical value table, we get 1m. 3 The density ρ is 1.57 g / cm³ when prepared with water. 3 The required solute masses for the well control fluid are: 1087.9 kg of calcium nitrate, 660.3 kg of calcium chloride, and 270.7 kg of potassium chloride.

[0060] The density ρ was calculated. 配制 =1.57g / cm 3 The volume Vprepared = 40.2 m2 3 When the well control fluid is prepared with clean water, the required amounts of each solute are as follows: calcium nitrate 21975.5 kg, calcium chloride 13338.8 kg, and potassium chloride 5469.0 kg.

[0061] The calculation uses volume V 水 =20.2 density ρ of water 基液 =1.52g / cm 3 When the base liquid is obtained, the volume V of the base liquid is obtained. 基液= V 水 ×1m 3 The density ρ is prepared with water and is 1.52 g / cm³. 3 The volume of kill fluid obtained.

[0062] Looking up the empirical value table, we get 1m. 3 Prepare 1.52g / cm solution with water. 3 The volume of the kill fluid obtained was 1.87 m³. 3 ; Obtain the base liquid volume V 基液 =37.8m 3 .

[0063] The solution prepared with water has a density ρ = 1.52 g / cm³. 3 ， Volume V 基液 =37.8m 3 Dosage of each solute: m 溶质 =Volume of clean water × 1m 3 The density ρ is prepared with water and is 1.52 g / cm³. 3 The required mass of solute for well kill fluid; Looking up the empirical value table, we get 1m. 3 The density ρ is prepared with water and is 1.52 g / cm³. 3The required solute masses for the well control fluid are: 995.4 kg of calcium nitrate, 605.9 kg of calcium chloride, and 249.0 kg of potassium chloride.

[0064] The calculated density ρ is 1.52 g / cm³. 3 Volume V 基液 =37.8m 3 When the well control fluid is prepared with clean water, the required amounts of each solute are as follows: calcium nitrate 20107.7 kg, calcium chloride 12240.0 kg, and potassium chloride 2029.5 kg.

[0065] The density ρ of the base liquid is calculated to be 1.52 g / cm³. 3 Adjust to a density of 1.57 g / cm³ 3 Amount of each solute: Δm 溶质 =m 压井液溶质 -m 基液溶质； Δm 硝酸钙 =1867.7kg; Δm 氯化钙 =1098.7kg; Δm 氯化钾 =439.5kg; The final result shows a density ρ = 1.52 g / cm³. 3 The base solution was prepared with a density ρ = 1.57 g / cm³. 3 The volume is 40.2m³. 3 The required base fluid for well kill fluid is 37.8m. 3 The following solutes need to be added: 1867.7 kg of calcium nitrate, 1098.7 kg of calcium chloride, and 439.5 kg of potassium chloride.

[0066] Well kill fluid preparation: Mix 37.8m 3 Clean water should not exceed 6m 3 The solution is transported in batches via an electric submersible pump from the inlet pipe 7 to the primary treatment tank 1 and the secondary treatment tank 2. Then, a screw conveyor 14 transports the chemicals in four batches (chemical ratio: calcium nitrate: calcium chloride: potassium chloride = 1:0.59:0.24, totaling 1867.7 kg of calcium nitrate, 1098.7 kg of calcium chloride, and 439.5 kg of potassium chloride) to the primary and secondary treatment tanks 1 and 2. The two tanks are prepared simultaneously, using a mixer 8 to agitate the solution. A level gauge 19 and a density meter 18 monitor the solution parameters in real time. When the density of the kill fluid in the tank reaches 1.57 g / cm³... 3 It was then pumped to the storage tank via pipeline pump 15. A total of 1.57 g / cm³ was prepared. 3 40.2m of homogeneous kill fluid 3The volume and density of the kill fluid met the requirements, and the entire fluid preparation process took a total of 4 hours.

[0067] Well control operation: Since there was no leakage in the casing, the tubing was well-sealed, and the packer backwash channel was unobstructed, the reverse circulation + forward squeeze method was used to balance the wellbore pressure. This mainly includes three steps: First, a 700-type cement truck was used to arrive at the site, and the cement truck and the process steel rigid pipeline were connected. The process pressure was tested at 25MPa, and the pressure was stabilized for 10 minutes without any punctures or leaks. The pump pressure was 14-0MPa, and the discharge rate was 200-300L / min. A 20m... 3 The kill fluid was applied using reverse circulation to balance the annular pressure of the casing and tubing. During the kill process, the fluid returning from the wellhead was throttled and stabilized through the incoming fluid shut-off valve 4. The density and volume were monitored in real time by the mass flow sensor 6, and the pressure was monitored in real time by the pressure gauge 20. The tubing backflow pressure was controlled at 10-12 MPa, and the casing injection pressure was less than 15 MPa. After the kill, there was no overflow in the tubing annulus, indicating successful kill. The second step involved applying 8.5 m of positive tubing fluid. 3 During the operation, the injection pressure was controlled to be less than 15MPa, and the discharge rate was 200-300L / min. In the third step, the well was shut in and the wellbore balance was automatically adjusted. After 15 minutes of shut-in, the measured fluid level was 60m, and there was no overflow at the wellhead, indicating that the well control was successful.

[0068] Recovery of kill fluid: The homogeneous fluid is recovered using "pulse-induced flowback recovery technology." The first step involves injecting 1.5m of clean water from the tubing at a high flow rate. 3 The pump stops after the pressure reaches the set value of 10MPa. The second step involves rapidly releasing pressure from the tubing, repeatedly preparing and purifying the homogeneous kill fluid. During this process, it is observed that the volume of fluid discharged each time is greater than the previous discharge within the same return period. The third step involves repeating the homogeneous kill fluid preparation and purification process 11 times, lasting 2.8 hours. After breaking the wellbore pressure balance and achieving automatic return, the homogeneous kill fluid preparation and purification process is stopped, and the kill fluid is recovered. The kill fluid returned from the well is regulated by a throttle valve 5 for stable return. A mass flow sensor 6 monitors the density and volume in real time. When the density is greater than the standard recovery density of 1.2g / m³, purification and recovery are performed. When the density is less than the standard recovery density of 1.2g / m³, the process is completely changed, and the fluid is discharged to the return tank. Processing flow: The kill fluid enters the primary treatment tank 1 through the inlet pipe 7 for oil removal and primary sedimentation. It overflows through the oil removal overflow port 10 to the secondary treatment tank, where it is filtered by the basket screen 11. After secondary sedimentation, it is pumped by the pipeline pump 15 through the external output pipe 17 from the external output port 29 to the storage tank, achieving a purification recovery of 1.53 g / cm³. 3 27m homogeneous liquid 3 .

[0069] After the well is sealed by throwing a ball to pressurize it, the site is cleaned up: Liquid waste cleaning and treatment: Oily waste from primary treatment tank 1 is discharged to the sludge tank via drain valve 12. Liquid waste from both primary and secondary treatment tanks is discharged to the sludge tank via drain pipe 13. Liquid waste from sludge tank 3 is discharged and recycled via drain pipe 13, with a total of 3.5 m³ of liquid waste recycled and treated. 3 .

[0070] Solid waste clean treatment: Solid waste at the bottom of the primary treatment tank 1, secondary treatment tank 2 and sewage tank 3 is discharged to the solid waste residue treatment device 23 through the solid sewage discharge valve 25 and then recycled, with a total of 0.5 m3 of solid waste recycled.

[0071] Example 3 The homogeneous kill fluid treatment device proposed in this embodiment, such as Figure 1 As shown, it includes a primary treatment tank 1, a secondary treatment tank 2 attached to one side of the primary treatment tank 1, and a sewage discharge device connected to the other side of the primary treatment tank 1. The bottoms of the primary treatment tank 1 and the secondary treatment tank 2 are both funnel-shaped. The top of the primary treatment tank 1 away from the secondary treatment tank 2 is connected to a liquid inlet assembly. The tops of the primary treatment tank 1 and the secondary treatment tank 2 that are close to each other are respectively connected to a screw conveyor 14. A stirring device is installed at the center of the top of the primary treatment tank 1 and the secondary treatment tank 2 respectively. The lower parts of the primary treatment tank 1 and the lower parts of the secondary treatment tank 2 are connected to a liquid discharge assembly and an external conveying assembly. The liquid discharge assembly is connected to the sewage discharge device. A solid waste treatment device 23 is placed below the primary treatment tank 1, the secondary treatment tank 2 and the sewage discharge device respectively.

[0072] Example 4 The homogeneous kill fluid treatment device proposed in this embodiment, such as Figure 1 As shown, the system includes a primary treatment tank 1, a secondary treatment tank 2 connected to one side of the primary treatment tank 1, and a sludge discharge device connected to the other side of the primary treatment tank 1. Both the primary treatment tank 1 and the secondary treatment tank 2 have funnel-shaped bottoms. A liquid inlet assembly is connected to the top of the primary treatment tank 1, away from the secondary treatment tank 2. Spiral material conveyors 14 are connected to the tops of the primary treatment tank 1 and the secondary treatment tank 2, which are close to each other. A stirring device is installed at the center of the top of both the primary treatment tank 1 and the secondary treatment tank 2. A sludge discharge assembly and an external conveying assembly are connected to the lower parts of both the primary treatment tank 1 and the secondary treatment tank 2. Figure 2 As shown, the liquid discharge assembly is connected to the sewage discharge device, and solid waste treatment devices 23 are placed below the primary treatment tank 1, the secondary treatment tank 2 and the sewage discharge device, respectively.

[0073] The screw conveyor 14 is electrically connected to an electrical control cabinet 16, which is electrically connected to the mixing device and the external conveying component.

[0074] like Figure 3As shown, overflow ports 10 are respectively provided on the upper part of the side where the primary treatment tank 1 and the secondary treatment tank 2 are in contact with each other. The primary treatment tank 1 and the secondary treatment tank 2 are connected through the two overflow ports 10. An oil separator baffle 9 is fixedly installed inside the primary treatment tank 1 near the overflow port 10. The bottom of the overflow port 10 is flush with the middle of the oil separator baffle 9. A basket grid 11 is fixedly installed inside the secondary treatment tank 2 near the overflow port 10. A level gauge 19 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively. A ball valve 24 is installed at the bottom of each level gauge 19. A density meter 18 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively.

[0075] The bottom ends of the two level gauges 19 extend into the primary treatment tank 1 and the secondary treatment tank 2, respectively, and one end of the two density gauges 18 extends into the primary treatment tank 1 and the secondary treatment tank 2, respectively.

[0076] The mixing device includes a mixer 8, each mixer 8 having a central rotating shaft 36 installed at its bottom. The two mixers 8 are respectively fixed to the top center of the primary treatment tank 1 and the secondary treatment tank 2. The two central rotating shafts 36 extend into the interior of the primary treatment tank 1 and the secondary treatment tank 2, respectively. Several mixing blades 37 are fixed on the central rotating shafts 36. The width of the mixing blades 37 along the radial direction of the tank body is slightly smaller than the inner radius of the tank body, and the height along the longitudinal direction of the tank body is slightly greater than the height of the upper edge of the funnel-shaped bottom. The mixer 8 is electrically connected to the electrical control cabinet 16.

[0077] Example 5 The homogeneous kill fluid treatment device proposed in this embodiment, such as Figure 1 As shown, the system includes a primary treatment tank 1, a secondary treatment tank 2 connected to one side of the primary treatment tank 1, and a sludge discharge device connected to the other side of the primary treatment tank 1. Both the primary treatment tank 1 and the secondary treatment tank 2 have funnel-shaped bottoms. A liquid inlet assembly is connected to the top of the primary treatment tank 1, away from the secondary treatment tank 2. Spiral material conveyors 14 are connected to the tops of the primary treatment tank 1 and the secondary treatment tank 2, which are close to each other. A stirring device is installed at the center of the top of both the primary treatment tank 1 and the secondary treatment tank 2. A sludge discharge assembly and an external conveying assembly are connected to the lower parts of both the primary treatment tank 1 and the secondary treatment tank 2. Figure 2 As shown, the liquid discharge assembly is connected to the sewage discharge device, and solid waste treatment devices 23 are placed below the primary treatment tank 1, the secondary treatment tank 2 and the sewage discharge device, respectively.

[0078] The screw conveyor 14 is electrically connected to an electrical control cabinet 16, which is electrically connected to the mixing device and the external conveying component.

[0079] like Figure 3As shown, overflow ports 10 are respectively provided on the upper part of the side where the primary treatment tank 1 and the secondary treatment tank 2 are in contact with each other. The primary treatment tank 1 and the secondary treatment tank 2 are connected through the two overflow ports 10. An oil separator baffle 9 is fixedly installed inside the primary treatment tank 1 near the overflow port 10. The bottom of the overflow port 10 is flush with the middle of the oil separator baffle 9. A basket grid 11 is fixedly installed inside the secondary treatment tank 2 near the overflow port 10. A level gauge 19 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively. A ball valve 24 is installed at the bottom of each level gauge 19. A density meter 18 is fixedly connected to one side of the primary treatment tank 1 and the secondary treatment tank 2 respectively.

[0080] The bottom ends of the two level gauges 19 extend into the primary treatment tank 1 and the secondary treatment tank 2, respectively, and one end of the two density gauges 18 extends into the primary treatment tank 1 and the secondary treatment tank 2, respectively.

[0081] The mixing device includes a mixer 8, each mixer 8 having a central rotating shaft 36 installed at its bottom. The two mixers 8 are respectively fixed to the top center of the primary treatment tank 1 and the secondary treatment tank 2. The two central rotating shafts 36 extend into the interior of the primary treatment tank 1 and the secondary treatment tank 2, respectively. Several mixing blades 37 are fixed on the central rotating shafts 36. The width of the mixing blades 37 along the radial direction of the tank body is slightly smaller than the inner radius of the tank body, and the height along the longitudinal direction of the tank body is slightly greater than the height of the upper edge of the funnel-shaped bottom. The mixer 8 is electrically connected to the electrical control cabinet 16.

[0082] like Figure 4 As shown, the external output assembly includes an external output pipeline 17. One end of the external output pipeline 17 is connected to the lower part of the secondary treatment tank 2, and the other end of the external output pipeline 17 has an external output port 29. The middle part of the external output pipeline 17 is connected to the primary treatment tank 1. External output valves 26 are installed near the primary treatment tank 1 and the secondary treatment tank 2, respectively. An external output main control valve 34 and a pipeline pump 15 are installed in sequence near the external output port 29 of the external output pipeline 17. The pipeline pump 15 is electrically connected to the electrical control cabinet 16.

[0083] The liquid inlet assembly includes a liquid inlet pipe 7. One end of the liquid inlet pipe 7 is connected to the top of the primary treatment tank 1 away from the secondary treatment tank 2. The other end of the liquid inlet pipe 7 is provided with a liquid inlet 21. A liquid inlet bypass pipe 30 is connected in the middle of the liquid inlet pipe 7. A liquid inlet bypass outlet 31 is provided at the other end of the liquid inlet bypass pipe 30. A liquid inlet bypass outlet valve 32 is installed in the middle of the liquid inlet bypass pipe 30. A liquid inlet shut-off valve 4, a pressure gauge 20, a throttle valve 5 and a mass flow sensor 6 are installed sequentially from the end of the liquid inlet pipe 7 near the liquid inlet 21. A liquid inlet control valve 35 is installed near the primary treatment tank 1 on the liquid inlet pipe 7.

[0084] The sewage discharge device includes a sewage discharge tank 3, which has a funnel-shaped bottom. The sewage discharge tank 3 and the primary treatment tank 1 are connected by an oil discharge pipe 38. The connection point between the oil discharge pipe 38 and the primary treatment tank 1 is higher than the lower edge of the oil separator baffle 9. An oil discharge valve 12 is installed in the middle of the oil discharge pipe 38. The sewage discharge tank 3 is connected to the liquid discharge assembly. A solid waste treatment device 23 is placed below the sewage discharge tank 3.

[0085] The drainage assembly includes a drainage pipe 13, one end of which is connected to the lower part of the secondary treatment tank 2, and the other end of which is provided with a drainage outlet 28. The middle part of the drainage pipe 13 is connected to the lower part of the primary treatment tank 1 and the lower part of the sewage tank 3. Liquid drainage valves 27 are installed near the primary treatment tank 1 and the secondary treatment tank 2. A sewage tank control valve 39 is installed near the sewage tank 3. A main drainage outlet valve 33 is installed near the drainage outlet 28.

[0086] Solid waste discharge valves 25 are installed at the bottom of the primary treatment tank 1, the secondary treatment tank 2, and the waste discharge tank 3.

Claims

1. A homogeneous well-killing fluid treatment device, characterized in that, The system includes a primary treatment tank (1), a secondary treatment tank (2) on one side of the primary treatment tank (1), and a sewage discharge device on the other side of the primary treatment tank (1). The bottoms of the primary treatment tank (1) and the secondary treatment tank (2) are funnel-shaped. The top of the primary treatment tank (1) away from the secondary treatment tank (2) is connected to a liquid inlet assembly. The tops of the primary treatment tank (1) and the secondary treatment tank (2) are connected to a spiral material conveyor (14) respectively. A stirring device is installed at the center of the top of the primary treatment tank (1) and the secondary treatment tank (2) respectively. The lower parts of the primary treatment tank (1) and the secondary treatment tank (2) are connected to a liquid discharge assembly and an external conveying assembly. The liquid discharge assembly is connected to the sewage discharge device. A solid waste treatment device (23) is placed below the primary treatment tank (1), the secondary treatment tank (2) and the sewage discharge device respectively.

2. The homogeneous well-killing fluid treatment device according to claim 1, characterized in that: The spiral material conveyor (14) is electrically connected to an electrical control cabinet (16), the electrical control cabinet (16) is electrically connected to the stirring device, and the electrical control cabinet (16) is electrically connected to the external conveying component.

3. The homogeneous well-killing fluid treatment device according to claim 2, characterized in that: Overflow ports (10) are respectively provided on the upper part of the side where the primary treatment tank (1) and the secondary treatment tank (2) are in contact with each other. The primary treatment tank (1) and the secondary treatment tank (2) are connected through two overflow ports (10). An oil separator baffle (9) is fixedly installed inside the primary treatment tank (1) near the overflow port (10). The bottom of the overflow port (10) is flush with the middle of the oil separator baffle (9). A basket grid (11) is fixedly installed inside the secondary treatment tank (2) near the overflow port (10). A level gauge (19) is fixedly connected to one side of the primary treatment tank (1) and the secondary treatment tank (2). A ball valve (24) is installed at the bottom of each level gauge (19). A density meter (18) is fixedly connected to one side of the primary treatment tank (1) and the secondary treatment tank (2).

4. The homogeneous well-killing fluid treatment device according to claim 3, characterized in that: The bottom ends of the two level gauges (19) extend into the primary treatment tank (1) and the secondary treatment tank (2) respectively, and one end of the two density gauges (18) extends into the primary treatment tank (1) and the secondary treatment tank (2) respectively.

5. The homogeneous well-killing fluid treatment device according to claim 2, characterized in that: The stirring device includes a mixer (8), each mixer (8) has a central rotating shaft (36) installed at its bottom, two mixers (8) are respectively fixed to the top center of the primary treatment tank (1) and the secondary treatment tank (2), two central rotating shafts (36) extend into the interior of the primary treatment tank (1) and the secondary treatment tank (2), and several stirring blades (37) are fixed on the central rotating shafts (36). The mixer (8) and the electrical control cabinet (16) are electrically connected.

6. The homogeneous well-killing fluid treatment device according to any one of claims 2-4, characterized in that: The external output component includes an external output pipe (17), one end of which is connected to the lower part of the secondary treatment tank (2), and the other end of which is provided with an external output port (29). The middle part of the external output pipe (17) is connected to the primary treatment tank (1). An external output valve (26) is installed near the primary treatment tank (1) and the secondary treatment tank (2) respectively. An external output main control valve (34) and a pipeline pump (15) are installed in sequence near the external output port (29) of the external output pipe (17). The pipeline pump (15) is electrically connected to the electrical control cabinet (16).

7. The homogeneous well-killing fluid treatment device according to any one of claims 1-4, characterized in that: The liquid inlet assembly includes a liquid inlet pipe (7), one end of which is connected to the top of the primary treatment tank (1) away from the secondary treatment tank (2). The other end of the liquid inlet pipe (7) is provided with a liquid inlet (21). A liquid bypass pipe (30) is connected in the middle of the liquid inlet pipe (7). A liquid bypass outlet (31) is provided at the other end of the liquid bypass pipe (30). A liquid bypass outlet valve (32) is installed in the middle of the liquid bypass pipe (30). A liquid shut-off valve (4), a pressure gauge (20), a throttle valve (5), and a mass flow sensor (6) are installed sequentially from the end of the liquid inlet pipe (7) near the liquid inlet (21). A liquid control valve (35) is installed on the liquid inlet pipe (7) near the primary treatment tank (1).

8. The homogeneous well-killing fluid treatment device according to claim 4, characterized in that: The sewage discharge device includes a sewage discharge tank (3), the bottom of which is funnel-shaped. The sewage discharge tank (3) and the primary treatment tank (1) are connected by an oil discharge pipe (38). The connection point between the oil discharge pipe (38) and the primary treatment tank (1) is higher than the lower edge of the oil separator (9). An oil discharge valve (12) is installed in the middle of the oil discharge pipe (38). The sewage discharge tank (3) is connected to the liquid discharge assembly. A solid waste treatment device (23) is placed below the sewage discharge tank (3).

9. The homogeneous well-killing fluid treatment device according to claim 8, characterized in that: The drainage assembly includes a drainage pipe (13), one end of which is connected to the lower part of the secondary treatment tank (2), and the other end of which is provided with a drainage outlet (28). The middle part of the drainage pipe (13) is connected to the lower part of the primary treatment tank (1) and the lower part of the sewage tank (3). Liquid drainage valves (27) are installed near the primary treatment tank (1) and the secondary treatment tank (2). A sewage tank control valve (39) is installed near the sewage tank (3). A main drainage outlet valve (33) is installed near the drainage outlet (28).

10. The homogeneous well-killing fluid treatment device according to claim 8, characterized in that: Solid drain valves (25) are installed at the bottom of the primary treatment tank (1), the secondary treatment tank (2) and the drain tank (3).

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