Foam base fluid recycling device and using method thereof
By designing a foam base liquid recycling device, the problems of long defoaming time, poor base liquid properties, and large equipment occupation in the recycling of foam waste liquid in foam drilling and milling were solved. It realizes rapid defoaming and reuse, reduces equipment occupation and relocation costs, and is suitable for the characteristics of continuous tubing foam drilling and milling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2026-03-10
AI Technical Summary
In existing foam drilling technology, the recycling of foam waste liquid has problems such as long defoaming time, poor recycling properties of base liquid, large equipment occupation, and high relocation costs.
A foam-based liquid recycling device was designed, including a liquid preparation tank, a pumping mechanism, a gas pressurization mechanism, a foaming mechanism, a throttling manifold, a circulating liquid tank, and a defoaming mechanism. The device achieves efficient recycling of the foam-based liquid through the foaming and defoaming processes. The device has a compact structure and the number of defoaming mechanisms can be flexibly adjusted to adapt to the characteristics of continuous tubing foam drilling.
It enables rapid defoaming and reuse of foam waste liquid, reduces equipment space occupation and relocation costs, meets the flexibility requirements of continuous tubing foam drilling, and ensures that drilling fluid does not fall to the ground during the entire operation, making it safe and environmentally friendly.
Smart Images
Figure CN121630249A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil well downhole technology, specifically to a foam-based fluid recycling device and its usage method. Background Technology
[0002] Currently, foam drilling technology is widely used in China. It is a technology that uses air, inert gas, etc., mixed with water-based drilling fluid and foamed with a foaming agent to form foam as a drilling medium. With the popularization and increasing maturity of coiled tubing operations, coiled tubing foam drilling technology has also been developed and applied. Compared with conventional foam drilling, coiled tubing foam drilling has advantages such as short preparation time, ability to operate under pressure, good equipment mobility, small footprint, and high degree of automation.
[0003] Because of the good mobility and small footprint of coiled tubing foam drilling and milling, the problem of recycling foam waste liquid, which already had multiple solutions in conventional foam drilling and milling, has become a new challenge. Conventional foam drilling and milling usually adopts the following methods: 1) Collecting and storing the foam and waiting for natural defoaming before recycling has the following drawbacks: the foam contains stabilizers, and the natural defoaming waiting time is long; the foam volume is large, requiring a sufficiently large storage area and a sufficient number of storage devices, which is limited by the well site area and has high equipment occupation costs; 2) Recycling the foam after adding defoamer has the following drawbacks: if the amount of defoamer is not well controlled, the foaming effect during recycling is not ideal, which in turn affects the drilling and milling effect; the properties of the foam base fluid deteriorate after multiple recyclings; 3) Recycling the foam after mechanical defoaming has the following problems: the multi-stage mechanical defoaming device used in conventional foam drilling and milling is suitable for long-term continuous operation conditions, but it occupies a lot of equipment and has high relocation costs when applied to coiled tubing pressurized foam drilling and milling. Summary of the Invention
[0004] This invention provides a foam base liquid recycling device and its usage method, which overcomes the shortcomings of the prior art. It can effectively solve the problems of long defoaming time, poor base liquid recycling properties, large equipment occupation, and high relocation costs of existing foam waste liquid recycling devices.
[0005] One of the technical solutions of the present invention is achieved through the following measures: a foam base liquid recycling device, comprising a liquid preparation tank, a pumping mechanism, a gas pressurization mechanism, a foaming mechanism, a throttling manifold, a circulating liquid tank, and a defoaming mechanism; The mixing tank is used to store the base liquid; The pumping mechanism is used to transport the base liquid in the mixing tank to the foaming mechanism; The gas pressurization mechanism is used to inject gas into the foaming mechanism; The gas and base liquid are mixed and foamed in the foaming mechanism to form foam base liquid, which is then injected into the working string in the well. Subsequently, the foam base liquid carries the foam waste liquid formed by drill cuttings through the annulus and is discharged back to the wellhead and enters the circulating fluid tank through the choke manifold. The circulating liquid tank is equipped with a defoaming mechanism that can defoam the foam waste liquid; The circulating liquid tank is connected to the liquid preparation tank.
[0006] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned foaming mechanism may include a skid, a foaming module, a foaming cylinder, a foaming assembly, and a foaming tube. A foaming module is fixedly installed on the upper side of the skid. The foaming module has a Y-shaped connecting cavity. An inlet pipe is fixedly connected between the rear left side of the foaming module and the outlet of the pumping mechanism. An air inlet pipe is fixedly connected between the front side of the foaming module and the gas pressurization mechanism. A foaming cylinder is fixedly connected between the right side of the foaming module and the well working string. A foaming tube is fixedly connected to the right end of the foaming cylinder. A foaming assembly is provided inside the foaming cylinder. The foaming assembly includes a mandrel and blades. The mandrel is coaxially installed inside the foaming cylinder. At least two sets of blades are fixedly fixed axially on the outer side of the mandrel. Each set of blades includes several spiral vanes fixed circumferentially on the outer side of the mandrel. The spiral vanes of each two adjacent sets of blades rotate in opposite directions.
[0007] The angle between the air inlet pipe and the liquid inlet pipe can be between 30° and 150°. Both the liquid inlet pipe and the air inlet pipe can be equipped with stopcock valves. A nozzle is installed in the liquid inlet pipe at the position between the stopcock valve and the foaming module. Several through holes are provided at intervals on the end face of the nozzle near the foaming module.
[0008] The inner diameter of the left end of the foaming tube can be smaller than the inner diameter of the right end of the foaming tube. Several guide vanes are evenly distributed around the outer side of the right end of the mandrel along the circumference. The spiral vane is fixed to the outer side of the mandrel to the left of the guide vane.
[0009] A one-way valve can be installed on the foaming pipe, and a density detection component is installed on the foaming pipe at the position between the one-way valve and the well work string.
[0010] The aforementioned defoaming mechanism may include a base, a hanger, a bubble baffle, and a defoamer. A hanger is fixedly installed on the upper right side of the circulating liquid tank, and a bubble baffle is fixedly installed on the lower side of the hanger. A gap is provided between the lower side of the bubble baffle and the lower inner wall of the circulating liquid tank. Several through-holes are provided on the side of the bubble baffle along its length. A base is fixedly installed on the inner left side of the circulating liquid tank corresponding to the position to the left of the bubble baffle. At least one defoamer is installed on the base at intervals from left to right.
[0011] The above may also include a sand removal mechanism, wherein the outlet of the throttling manifold is fixedly connected to the inlet of the sand removal mechanism, and the outlet of the sand removal mechanism is fixedly connected to the inlet at the right end of the circulating liquid tank.
[0012] The filter holes can be circular with a diameter not exceeding 5 mm, or they can be elongated with a width not exceeding 5 mm.
[0013] The distance between the lower side of the aforementioned bubble baffle and the lower inner wall of the circulating liquid tank may not exceed 500 mm.
[0014] The upper right side of the aforementioned base can be fixedly installed together with the circulating liquid tank. At least one hinge seat is fixedly installed at a distance from front to back on the upper left side of the base. Each hinge seat is hinged with an adjusting screw. An adjusting nut is screwed to the outer side of the left end of the adjusting screw. An adjusting sleeve is fitted on the outer side of the adjusting screw corresponding to the position between the adjusting nut and the hinge seat. A pawl is fixedly installed at the lower end of the adjusting sleeve. The front end of the pawl has a slot that runs through the front and back and opens to the right. A connecting rod is fixedly installed in the slot at the corresponding position of the circulating liquid tank.
[0015] The second technical solution of the present invention is achieved through the following measures: a method of using a foam base liquid recycling device, which is carried out according to the following steps: Step 1: Pour the base liquid with added foaming agent into the mixing tank; Step 2: The pumping mechanism pumps the base liquid with added foaming agent into the foaming module, while the gas pressurization mechanism injects compressed gas into the foaming module. Step 3: Compressed gas and base liquid with added foaming agent are mixed and foamed in the foaming module, and the resulting foam base liquid enters the well work string. Step 4: After the foam base fluid carries the drill cuttings to form foam waste fluid, it is returned to the wellhead through the annulus of the oil casing. Step 5: The foam waste liquid enters the circulating liquid tank through the throttling manifold; Step six: The foam waste liquid is defoamed after passing through a defoamer; Step 7: After the foam waste liquid settles in the circulating liquid tank, it enters the mixing tank for reuse.
[0016] The following are further optimizations and / or improvements to the second technical solution of the above invention: In step five above, when the amount of drill cuttings returned exceeds the set value, the foam waste liquid first enters the desander mechanism through the throttling manifold, and then enters the circulating liquid tank.
[0017] This invention has a reasonable and compact structure. A base liquid with added foaming agent is injected into the liquid preparation tank. The base liquid is pumped into the foaming mechanism through a pumping mechanism. At the same time, a gas pressurization mechanism delivers compressed gas to the foaming mechanism. The compressed gas and the base liquid mix and foam in the foaming mechanism to form a foam base liquid. With the pumping mechanism continuously pumping, the foam base liquid enters the working tubing in the well. Then, it carries the foam waste liquid formed by drill cuttings and is returned to the wellhead through the annulus. The foam waste liquid enters the circulating liquid tank through the choke manifold. The foam waste liquid is defoamed by the defoaming mechanism. The defoamed foam waste liquid settles and is recycled in the circulating liquid tank after sand removal.
[0018] This invention is easy to install, the number of defoaming mechanisms can be flexibly adjusted according to the actual defoaming load, it occupies little space, and can be moved along with the liquid tank. It meets the characteristics of continuous tubing foam drilling and grinding. The drilling fluid does not fall to the ground during the entire operation process, and the waste liquid is recycled and treated after the operation, which is safe and environmentally friendly. Attached Figure Description
[0019] Appendix Figure 1 This is a schematic diagram of the structure of the preferred embodiment of the present invention.
[0020] Appendix Figure 2 For the appendix Figure 1 A top view of the foaming mechanism.
[0021] Appendix Figure 3 For the appendix Figure 2 A three-dimensional magnified structural diagram of the medium-density foaming component.
[0022] Appendix Figure 4 For the appendix Figure 2 A three-dimensional magnified schematic diagram of the nozzle.
[0023] Appendix Figure 5 For the appendix Figure 1 A schematic diagram of the front sectional view of the circulating liquid tank.
[0024] Appendix Figure 6 For the appendix Figure 5 A three-dimensional enlarged structural diagram of the defoamer and the base.
[0025] Appendix Figure 7 For the appendix Figure 5 A three-dimensional enlarged structural diagram of the middle baffle plate and the hanger.
[0026] Appendix Figure 8 For the appendix Figure 7 A magnified structural diagram of point A in the middle.
[0027] The codes in the attached diagram are as follows: 1 is the liquid preparation tank, 2 is the pumping mechanism, 3 is the gas boosting mechanism, 4 is the choke manifold, 5 is the well work string, 6 is the water supply line, 7 is the circulating liquid tank, 8 is the skid, 9 is the foaming module, 10 is the liquid inlet pipe, 11 is the air inlet pipe, 12 is the foaming cylinder, 13 is the foaming tube, 14 is the mandrel, 15 is the spiral vane, 16 is the stopcock valve, 17 is the nozzle, 18 is the through hole, 19 is the guide vane, 20 is the one-way valve, 21 is the density detection component, 22 is the base, 23 is the hanger, 24 is the bubble baffle, 25 is the filter hole, 26 is the defoamer, 27 is the sand removal mechanism, 28 is the hinge seat, 29 is the adjusting screw, 30 is the adjusting nut, 31 is the adjusting sleeve, 32 is the pawl, 33 is the slot, and 34 is the connecting rod. Detailed Implementation
[0028] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.
[0029] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.
[0030] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 5, the foam base liquid recycling device includes a liquid preparation tank 1, a pumping mechanism 2, a gas pressurization mechanism 3, a foaming mechanism, a throttling manifold 4, a circulating liquid tank 7, and a defoaming mechanism. The liquid preparation tank 1 is used to store the base liquid; The pumping mechanism 2 is used to transport the base liquid in the liquid preparation tank 1 to the foaming mechanism; The gas pressurization mechanism 3 is used to inject gas into the foaming mechanism; After the gas and base liquid are mixed and foamed in the foaming mechanism to form foam base liquid, it is injected into the working string 5 in the well. Then, the foam base liquid carries the foam waste liquid formed by drill cuttings through the annulus to the wellhead and enters the circulating fluid tank 7 through the choke manifold 4. The circulating liquid tank 7 is equipped with a defoaming mechanism that can defoam the foam waste liquid; The circulating liquid tank 7 is connected to the liquid preparation tank 1.
[0031] According to requirements, the liquid preparation tank 1, pumping mechanism 2, foaming mechanism, in-well working string 5, choke manifold 4, and circulating liquid tank 7 are sequentially and fixedly connected together. The gas pressurization mechanism 3 is fixedly connected to the foaming mechanism. The outlet of the circulating liquid tank 7 and the inlet of the liquid preparation tank 1 are fixedly connected. The liquid preparation tank 1 can be a conventional mud tank or other water storage container that meets the requirements. The pumping mechanism 2 can be a known technology, such as a fracturing pump truck. The choke manifold 4 is a known conventional well control choke manifold. The gas pressurization mechanism 3 can be a nitrogen generator truck, which can produce and pump nitrogen.
[0032] During use, a base liquid with added foaming agent is injected into the mixing tank 1. The base liquid is continuously pumped into the foaming mechanism through the pumping mechanism 2. At the same time, the gas pressurization mechanism 3 continuously delivers compressed gas to the foaming mechanism. The compressed gas and the base liquid mix and foam in the foaming mechanism to form a foam base liquid. With the continuous pumping of the pumping mechanism 2, the foam base liquid enters the working tubing 5 in the well. Then, the foam base liquid carries the foam waste liquid formed by drill cuttings and is discharged back to the wellhead through the annulus. The foam waste liquid enters the circulating liquid tank 7 through the choke manifold 4. The foam waste liquid is defoamed by the defoaming mechanism. The defoamed foam waste liquid settles and is recycled in the circulating liquid tank 7 after sand removal.
[0033] This invention is easy to install, the number of defoaming mechanisms can be flexibly adjusted according to the actual defoaming load, it occupies little space, and can be moved along with the liquid tank. It meets the characteristics of continuous tubing foam drilling and grinding. The drilling fluid does not fall to the ground during the entire operation process, and the waste liquid is recycled and treated after the operation, which is safe and environmentally friendly.
[0034] The above-mentioned foam base liquid recycling device can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown in Figure 3, the foaming mechanism includes a skid 8, a foaming module 9, a foaming cylinder 12, a foaming assembly, and a foaming tube 13. The foaming module 9 is fixedly installed on the upper side of the skid 8. The foaming module 9 has a Y-shaped connecting cavity. An inlet pipe 10 is fixedly connected between the rear left side of the foaming module 9 and the outlet of the pumping mechanism 2. An air inlet pipe 11 is fixedly connected between the front side of the foaming module 9 and the gas pressurization mechanism 3. The foaming cylinder 12 is fixedly connected between the right side of the foaming module 9 and the well working string 5. The foaming tube 13 is fixedly connected to the right end of the foaming cylinder 12. A foaming assembly is provided inside the foaming cylinder 12. The foaming assembly includes a mandrel 14 and blades. The mandrel 14 is coaxially installed inside the foaming cylinder 12. At least two sets of blades are fixedly fixed along the axial direction on the outer side of the mandrel 14. Each set of blades includes several spiral blades 15 fixed along the circumference on the outer side of the mandrel 14. The spiral blades 15 of each two adjacent sets of blades rotate in opposite directions.
[0035] Depending on the requirements, the foaming module 9 can be based on existing known technologies, such as a Y-type tee. During use, by setting multiple sets of alternating clockwise and counterclockwise spiral blades 15, the gas and liquid are fully stirred and mixed as they pass through, enabling the gas-liquid mixture to be fully mixed and foamed after stirring. The other end of the foaming tube 13 is fixedly connected to the inlet of the well work string 5 during use.
[0036] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 2 As shown, the angle between the air inlet pipe 11 and the liquid inlet pipe 10 is between 30° and 150°.
[0037] During use, this setup allows the liquid and compressed gas to mix thoroughly. The gas-liquid mixture flows into the foaming cylinder 12 and eventually into the well work string 5. At the same time, this setup also allows the compressed gas to pressurize the liquid, improving the gas-liquid mixing efficiency.
[0038] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 2 , 4 As shown, both the liquid inlet pipe 10 and the air inlet pipe 11 are equipped with stopcock valves 16. A nozzle 17 is installed in the liquid inlet pipe 10 at the position between the stopcock valve 16 and the foaming module 9. Several through holes 18 are provided at intervals on the end face of the nozzle 17 near the foaming module 9.
[0039] During use, the flow of fluid can be controlled by setting the stop valve 16, and the base liquid can be accelerated and atomized after flowing through the through hole 18 by setting the nozzle 17. This can increase the contact area with the gas, so that the base liquid and the gas can be fully mixed, which is conducive to the subsequent foaming of the base liquid.
[0040] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 2 , 3 As shown, the inner diameter of the left end of the foaming tube 13 is smaller than the inner diameter of the right end of the foaming tube 13. Several guide vanes 19 are evenly distributed around the outer side of the right end of the mandrel 14. The spiral vane 15 is fixed to the outer side of the mandrel 14 to the left of the guide vane 19.
[0041] During use, the inner diameter of the left end of the foaming tube 13 is smaller than the inner diameter of the right end of the foaming tube 13. This creates a step on the inner side of the right end of the foaming cylinder 12, which facilitates the installation of the mandrel 14 and also limits the mandrel 14. By setting the guide vane 19, the foam base liquid can flow quickly into the well working string 5.
[0042] Example 6: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2As shown, a one-way valve 20 is installed on the foaming pipe 13, and a density detection component 21 is installed on the foaming pipe 13 at the position between the one-way valve 20 and the well work string 5.
[0043] According to the requirements, the one-way valve 20 is a known technology, and the density detection component 21 is a known technology. For example, a gas flow meter, pressure transmitter, temperature transmitter, fluid density transmitter and intelligent liquid flow meter are installed sequentially on the foaming pipe 13. The gas flow meter, pressure transmitter, temperature transmitter, fluid density transmitter and intelligent liquid flow meter are all connected to the known PLC module. In this way, the density of foam liquid can be monitored in real time to ensure that the performance of foam base liquid meets the operation requirements. By setting the one-way valve 20, the backflow of fluid in the well to the surface equipment can be prevented.
[0044] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 , 5 As shown in Figure 8, the defoaming mechanism includes a base 22, a hanger 23, a bubble baffle 24, and a defoamer 26. The hanger 23 is fixedly installed on the upper right side of the circulating liquid tank 7, and the bubble baffle 24 is fixedly installed on the lower side of the hanger 23. There is a gap between the lower side of the bubble baffle 24 and the lower inner wall of the circulating liquid tank 7. The side of the bubble baffle 24 is provided with a number of through-holes 25 along the length direction. The base 22 is fixedly installed on the inner left side of the circulating liquid tank 7 corresponding to the position to the left of the bubble baffle 24. At least one defoamer 26 is installed on the base 22 at intervals.
[0045] According to requirements, the upper right side of the circulating liquid tank 7 is provided with a through-hole, and the upper part of the hanger 23 is sealed and fixedly installed in the right mounting hole. The right side of the bubble baffle 24 is provided with several through-holes 25, and the upper left side of the circulating liquid tank 7, corresponding to the position of the bubble baffle 24, is provided with a through-hole, and the upper part of the base 22 is sealed and fixedly installed in the left mounting hole. The defoamer 26 is a known technology, such as a centrifugal mechanical defoamer. Two defoamers 26 are installed on the base 22 at intervals, and the upper part of the defoamer 26 can also be fixedly installed on the base 22 at intervals. One or both can be used during use. The hanger 23 is easy to install in the circulating liquid tank 7 and can also adjust the position of the bubble baffle 24 according to the defoaming situation. The material of the bubble baffle 24 can be cold-rolled steel plate or plastic. The installation position and quantity of the defoamer 26 and the bubble baffle 24 can be quickly adjusted according to the on-site operation requirements, which is convenient for disassembly, assembly and transportation.
[0046] Example 8: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, it also includes a sand removal mechanism 27. The outlet of the throttling manifold 4 is fixedly connected to the inlet of the sand removal mechanism 27, and the outlet of the sand removal mechanism 27 is fixedly connected to the inlet at the right end of the circulating liquid tank 7.
[0047] Depending on the requirements, the desanding mechanism 27 is a known existing technology, such as a hydrocyclone desander. The installation of the desanding mechanism 27 can be selected based on the actual operating conditions. During use, by setting up the desanding mechanism 27, drill cuttings in the foam waste liquid can be screened out, facilitating the recycling of the foam waste liquid.
[0048] Example 9: As an optimization of the above examples, as shown in the appendix Figure 7 , 8 As shown, the filter hole 25 is circular and the diameter of the filter hole 25 is no greater than 5mm, or the filter hole 25 is elongated and the width of the filter hole 25 is no greater than 5mm.
[0049] During use, this setting can improve the defoaming effect, and the spacing between the filter holes 25 can be adjusted according to the liquid flow rate.
[0050] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 5 As shown, the distance between the lower side of the bubble baffle 24 and the lower inner wall of the circulating liquid tank 7 is no more than 500mm.
[0051] During use, with this setup, the foam waste liquid enters the circulating liquid tank 7 and is concentrated at the lower part of the defoamer 26 by the baffle plate 24. This allows the defoamer 26 to break more foam when it is working. The distance between the lower side of the baffle plate 24 and the lower inner wall of the circulating liquid tank 7 is no more than 500mm. This allows the defoamer 26 to suck in the foam waste liquid and then throw it out, causing the foam to break and turn into liquid. The drill cuttings carried out by the foam waste liquid from the oil sheath quickly settle after the foam turns into liquid. The settled liquid flows into the mixing tank 1 through the filter hole 25 for recycling. As needed, a water supply line 6 is fixed between the outlet of the circulating liquid tank 7 and the inlet of the mixing tank 1. The drill cuttings carried out by the foam waste liquid from the oil sheath quickly settle after the foam turns into liquid. The settled liquid enters the mixing tank 1 for recycling through the water supply line 6.
[0052] Example 11: As an optimization of the above embodiments, as shown in the appendix. Figure 1 , 2 As shown, the upper right side of the base 22 is fixedly installed with the circulating liquid tank 7. At least one hinge seat 28 is fixedly installed at a distance from front to back on the upper left side of the base 22. Each hinge seat 28 is hingedly installed with an adjusting screw 29. An adjusting nut 30 is screwed to the outer left end of the adjusting screw 29. An adjusting sleeve 31 is fitted on the outer side of the adjusting screw 29 corresponding to the position between the adjusting nut 30 and the hinge seat 28. A pawl 32 is fixedly installed at the lower end of the adjusting sleeve 31. The front end of the pawl 32 is provided with a slot 33 that runs through the front and back and opens to the right. A connecting rod 34 is fixedly installed in the slot 33 at the corresponding position of the circulating liquid tank 7.
[0053] As required, lifting lugs are fixedly installed at intervals on both the front and rear sides of the base 22. Each lifting lug is connected to the inner wall of the circulating liquid tank 7 using a known connector, such as a lifting ring or a locking buckle. During use, the mounting base can be adjusted according to the size of the circulating liquid tank 7 by using the adjusting screw 29 and adjusting nut 30, reducing the difficulty of installation.
[0054] Example 12: As an optimization of the above embodiments, as shown in the appendix Figures 1 to 8 As shown, the method of using this foam base liquid recycling device is as follows: Step 1: Inject the base liquid with added foaming agent into the liquid preparation tank 1; Step 2: The pumping mechanism 2 pumps the base liquid with added foaming agent into the foaming module 9, while the gas pressurization mechanism 3 injects compressed gas into the foaming module 9. Step 3: Compressed gas and base liquid with added foaming agent are mixed and foamed in foaming module 9, and the resulting foam base liquid enters the well work string 5. Step 4: After the foam base fluid carries the drill cuttings to form foam waste fluid, it is returned to the wellhead through the annulus of the oil casing. Step 5: The foam waste liquid enters the circulating liquid tank 7 through the throttling manifold 4; Step 6: The foam waste liquid is defoamed after passing through defoamer 26; Step 7: After the foam waste liquid settles in the circulating liquid tank 7, it enters the mixing tank 1 for reuse.
[0055] During use, a base liquid with added foaming agent is injected into the mixing tank 1. The base liquid is pumped into the foaming mechanism through the pumping mechanism 2. At the same time, the gas pressurization mechanism 3 delivers compressed gas to the foaming mechanism. The compressed gas and the base liquid mix and foam in the foaming mechanism to form foam base liquid. With the continuous pumping of the pumping mechanism 2, the foam base liquid enters the working tubing 5 in the well through the density monitoring component. Then, it carries the drill cuttings through the annulus to form foam waste liquid and is discharged back to the wellhead. The foam waste liquid enters the circulating liquid tank 7 through the choke manifold 4. The foam waste liquid is defoamed by the defoaming mechanism. The defoamed foam waste liquid settles and is recycled in the circulating liquid tank 7 after sand removal.
[0056] The usage method of the above-mentioned foam base liquid recycling device can be further optimized and / or improved according to actual needs: Example 13: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, in step five, when the amount of drill cuttings returned exceeds the set value, the foam waste liquid first enters the desanding mechanism 27 through the throttling manifold 4, and then enters the circulating liquid tank 7.
[0057] When the amount of drill cuttings returned exceeds the set value, the foam waste liquid can be desanded by the desanding structure before entering the circulating liquid tank 7 for defoaming when it leaves the well. This can improve the defoaming efficiency of the circulating liquid tank 7 and also increase the reuse rate of the foam waste liquid.
[0058] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
Claims
1. A foam base fluid recycling device, characterized by The device comprises a liquid preparation tank, a pumping mechanism, a gas pressurizing mechanism, a foaming mechanism, a throttle manifold, a circulating liquid tank and a defoaming mechanism. The liquid preparation tank is used for storing base liquid. The pumping mechanism is used for transporting the base liquid in the liquid preparation tank to the foaming mechanism. The gas pressurizing mechanism is used for injecting gas into the foaming mechanism. After the gas and the base liquid are mixed and foamed in the foaming mechanism to form foam base liquid, the gas is injected into a working string in a well, and then the foam base liquid carrying foam waste liquid formed by drill cuttings is returned to the wellhead through an oil jacket annulus and enters the circulating liquid tank through the throttle manifold. The circulating liquid tank is provided with a defoaming mechanism capable of defoaming the foam waste liquid. The circulating liquid tank is connected with the liquid preparation tank.
2. The foam-based fluid recycling apparatus according to claim 1, characterized in that The foaming mechanism comprises a pry seat, a foaming module, a foaming cylinder, a foaming assembly and a foaming pipe.
3. The foam-based fluid recycling apparatus according to claim 2, wherein The foaming module is fixedly installed on the upper side of the pry seat. The foaming module is provided with a Y-shaped communication cavity.
4. Foam-based fluid recycling apparatus according to claim 2 or 3, characterized in that The foaming module is fixedly and communicatively connected between the left side of the rear part of the foaming module and the outlet of the pumping mechanism. The foaming module is fixedly and communicatively connected between the front side of the foaming module and the gas pressurizing mechanism.
5. The foam-based fluid recycling apparatus according to claim 1 or 2 or 3, characterized by The foaming cylinder is fixedly and communicatively connected between the right side of the foaming module and the working string in the well.
6. The foam-based fluid recycling apparatus of claim 4, wherein The foaming cylinder is fixedly and communicatively connected between the right end of the foaming cylinder and the foaming pipe.
7. The foam-based fluid recycling apparatus according to claim 5, wherein The foaming assembly is arranged in the foaming cylinder. The foaming assembly comprises a mandrel and blades. The mandrel is coaxially installed in the foaming cylinder. At least two groups of blades are fixedly arranged on the outer side of the mandrel in the axial direction. Each group of blades comprises a plurality of helical vanes fixedly arranged on the outer side of the mandrel in the circumferential direction. The helical vanes of each adjacent two groups of blades are in opposite rotation directions. The angle between the inlet pipe and the liquid inlet pipe is between 30° and 150°. The inlet pipe and the liquid inlet pipe are both provided with a plug valve. A nozzle is arranged in the liquid inlet pipe corresponding to the position between the plug valve and the foaming module. The nozzle is provided with a plurality of through holes arranged at intervals on the end face close to the foaming module. The inner diameter of the left end of the foaming pipe is smaller than the inner diameter of the right end of the foaming pipe. A plurality of guide vanes are arranged at intervals on the outer side of the right end of the mandrel in the circumferential direction. The helical vanes are fixedly arranged on the outer side of the mandrel left to the guide vanes. The foaming pipe is provided with a one-way valve. A density detection assembly is arranged on the foaming pipe corresponding to the position between the one-way valve and the working string in the well. The defoaming mechanism comprises a base, a hanger, a bubble blocking plate and a defoaming device. The hanger is fixedly installed on the right part of the upper side of the circulating liquid tank. The bubble blocking plate is fixedly installed on the lower side of the hanger. A gap is arranged between the lower side of the bubble blocking plate and the inner wall of the lower part of the circulating liquid tank. A plurality of filter holes are arranged at intervals in the length direction on the side of the bubble blocking plate. The base is fixedly installed on the left part of the inner side of the circulating liquid tank corresponding to the position left to the bubble blocking plate. At least one defoaming device is installed at intervals on the left part of the upper side of the base corresponding to the position left to the bubble blocking plate. The defoaming mechanism comprises a bracket, a hanger, a bubble blocking plate and a defoaming device. The bracket is installed on the upper side of the circulating liquid tank. The hanger is fixedly installed on the lower side of the right part of the bracket. The bubble blocking plate is fixedly installed on the lower side of the hanger. A gap is arranged between the lower side of the bubble blocking plate and the inner wall of the lower part of the circulating liquid tank. A plurality of filter holes are arranged at intervals in the length direction on the side of the bubble blocking plate. At least one defoaming device is installed at intervals on the left part of the upper side of the bracket corresponding to the position left to the bubble blocking plate. The device further comprises a sand removal mechanism. The outlet of the throttle manifold is fixedly and communicatively connected with the inlet of the sand removal mechanism. The outlet of the sand removal mechanism is fixedly and communicatively connected with the inlet of the right end of the circulating liquid tank. Or / and, the filter hole is circular, and the diameter of the filter hole is not greater than 5mm, or the filter hole is long strip-shaped, and the width of the filter hole is not greater than 5mm; Or / and, the distance between the lower side of the bubble blocking plate and the inner wall of the lower part of the circulating liquid tank is not greater than 500mm; Or / and, the upper side of the right part of the base is fixedly installed together with the circulating liquid tank, at least one hinged seat is fixedly installed at the upper side of the left part of the base in front and back, each hinged seat is hingedly installed with an adjusting screw, an adjusting nut is screwed on the outer side of the left end of the adjusting screw, an adjusting sleeve is sleeved on the outer side of the adjusting screw corresponding to the position between the adjusting nut and the hinged seat, a pawl is fixedly installed at the lower end of the adjusting sleeve, a clamping groove is arranged at the front end of the pawl and penetrates through the front and back and opens to the right, and a connecting rod is fixedly installed together with the circulating liquid tank at the position corresponding to the clamping groove.
8. The foam-based fluid recycling apparatus of claim 6, wherein Or / and, the filter hole is circular, and the diameter of the filter hole is not greater than 5mm, or the filter hole is long strip-shaped, and the width of the filter hole is not greater than 5mm; Or / and, the distance between the lower side of the bubble blocking plate and the inner wall of the lower part of the circulating liquid tank is not greater than 500mm; Or / and, the upper side of the right part of the base is fixedly installed together with the circulating liquid tank, at least one hinged seat is fixedly installed at the upper side of the left part of the base in front and back, each hinged seat is hingedly installed with an adjusting screw, an adjusting nut is screwed on the outer side of the left end of the adjusting screw, an adjusting sleeve is sleeved on the outer side of the adjusting screw corresponding to the position between the adjusting nut and the hinged seat, a pawl is fixedly installed at the lower end of the adjusting sleeve, a clamping groove is arranged at the front end of the pawl and penetrates through the front and back and opens to the right, and a connecting rod is fixedly installed together with the circulating liquid tank at the position corresponding to the clamping groove.
9. A method of using a foam-based fluid recycling apparatus according to any one of claims 5 to 8, characterized in that The following steps are performed: Step one, injecting the base liquid added with a foaming agent into the liquid preparation tank; Step two, pumping the base liquid added with a foaming agent into the foaming module by the pumping mechanism, and injecting compressed gas into the foaming module by the gas pressurizing mechanism; Step three, mixing and foaming the compressed gas and the base liquid added with a foaming agent in the foaming module, and forming the foam base liquid into the well operation pipe column; Step four, carrying the drill cuttings to form the foam waste liquid, and then returning the foam waste liquid to the wellhead through the oil jacket annulus; Step five, the foam waste liquid enters the circulating liquid tank through the choke manifold; Step six, the foam waste liquid is defoamed after passing through the defoaming device; Step seven, the defoamed foam waste liquid is settled in the circulating liquid tank and then enters the liquid preparation tank for reuse.
10. The method of using a foam-based fluid recycling apparatus of claim 9, wherein, In step five, when the amount of drill cuttings returned is greater than the set value, the foam waste liquid enters the sand removal mechanism first and then enters the circulating liquid tank through the choke manifold.