A drilling fluid tank purification system

Abstract

The utility model relates to a kind of drilling fluid tank type purification systems, belong to drilling fluid processing technical field, including tank component, vibrating screen, centrifuge, sand cleaner, mud cleaner and vacuum degasser, tank component includes the pretreatment tank, processing tank one, processing tank two, processing tank three and processing tank four and processing tank five that are sequentially arranged, processing tank two is equipped with the compartment board that it is divided into left compartment and right compartment, the import and export of sand cleaner are connected left compartment and right compartment respectively, the import and export of centrifuge are connected processing tank three and processing tank four respectively, pipeline on centrifuge outlet is equipped with jet mixer, jet mixer is connected with flocculating agent tank by dosing pipe and dosing pump.The utility model is classified and purified design to realize large particle impurities, sand, argillaceous particle is removed gradually, solve the problem of low efficiency caused by traditional equipment mixing treatment, purification efficiency is significantly improved;Realize reagent uniform spraying and sufficient mixing, greatly improve flocculation and sedimentation effect.

Description

Technical Field

[0001] This utility model relates to a drilling fluid tank purification system, belonging to the field of drilling fluid treatment technology. Background Technology

[0002] During drilling operations, drilling fluid, often referred to as the "blood of drilling," directly impacts drilling efficiency, wellbore stability, and drilling safety. During recycling, drilling fluid can become contaminated with rock cuttings, sand, mud, and other solid particles, and may also dissolve gases or harmful substances. This can lead to deterioration of performance parameters such as viscosity and shear stress, affecting drilling progress and potentially causing well collapse, stuck pipe, and other safety accidents.

[0003] Existing drilling fluid purification equipment mostly adopts a single tank combined with a separation device structure, which has the following defects: First, the purification process lacks a graded treatment design, and large and fine particulate impurities are treated simultaneously, resulting in a high load on the separation equipment and low purification efficiency; Second, the method of adding reagents is unreasonable, and the reagents are not mixed evenly with the drilling fluid, making it difficult to give full play to the flocculation and sedimentation effects. Utility Model Content

[0004] This invention provides a drilling fluid tank purification system to solve the problems existing in the background art.

[0005] This utility model relates to a drilling fluid tank purification system, including a tank assembly, a vibrating screen, a centrifuge, a desander cleaner, a mud cleaner, and a vacuum degasser. The tank assembly includes a pretreatment tank, a treatment tank one, a treatment tank two, a treatment tank three, a treatment tank four, and a treatment tank five arranged sequentially. The vibrating screen is located at the top left end of the pretreatment tank. A dosing tank is located at the top of the pretreatment tank. Treatment tank two has a partition plate that divides it into a left compartment and a right compartment. The partition plate has a return port. The inlet and outlet of the desander cleaner are connected to the left compartment and the right compartment, respectively. The inlet and outlet of the mud cleaner are connected to the right compartment and treatment tank three, respectively. The inlet and outlet of the centrifuge are connected to treatment tank three and treatment tank four, respectively. Treatment tank four is divided into a mixing zone and a sedimentation zone by an overflow plate one. An overflow port connected to treatment tank five is located at the top of the sedimentation zone. A jet mixer is located on the pipeline at the centrifuge outlet. The jet mixer is connected to a flocculant tank through a dosing pipe and a dosing pump.

[0006] As a preferred embodiment, each of the pretreatment tank, treatment tank one, treatment tank two, treatment tank three, and treatment tank four is equipped with an agitator, and each of treatment tank one, treatment tank two, and the pretreatment tank is equipped with an overflow plate two. The agitator can effectively prevent the deposition of solid particles in the drilling fluid in each tank, ensuring that the drilling fluid is always in a uniformly mixed state and avoiding excessively high local impurity concentrations that would affect the treatment effect, while the overflow plate two enables the smooth transfer of drilling fluid between the tanks.

[0007] As a preferred embodiment, the upper part of the sedimentation zone is provided with inclined plate packing, and the overflow port is located above the inclined plate packing.

[0008] As a preferred embodiment, a replenishment tank is located at the left end of the pretreatment tank. The pretreatment tank is connected to a return pump, and the outlet of the return pump is connected to the replenishment tank via a pipeline. The replenishment tank is also connected to a replenishment pump. This forms a closed-loop circulation mechanism, allowing drilling fluid in the pretreatment tank that has reached the reuse standard to flow back to the replenishment tank via the return pump, thereby replenishing the drilling fluid at the wellhead.

[0009] As a preferred embodiment, the bottom of the pretreatment tank is inclined with the right side higher than the left side, and a drain pipe is provided at the bottom left end of the pretreatment tank.

[0010] As a preferred embodiment, a ring-shaped infusion pipe is fixed to the upper side wall of the pretreatment tank below the vibrating screen. Multiple distributors are evenly fixed to the bottom of the infusion pipe. The infusion pipe is connected to the dosing tank via a dosing pipeline, which is equipped with a dosing pump. The ring-shaped infusion pipe, together with the multiple distributors, achieves full coverage spraying of the agent on the left side of the pretreatment tank, and can mix the agent with the drilling fluid slurry freshly falling from the vibrating screen, thereby increasing the treatment effect.

[0011] As a preferred embodiment, the distributor includes a conduit fixed to the bottom of the infusion pipe. A flow-guiding cone is fixed to the bottom of the conduit, and a vertical connecting end is located at the bottom of the flow-guiding cone. A hemispherical distribution ball is fixed to the bottom of the connecting end, and the distribution ball has evenly distributed distribution holes. The evenly distributed distribution holes on the hemispherical distribution ball allow the agent to form a fine spray effect, greatly increasing the contact area between the agent and the drilling fluid, promoting rapid and thorough mixing of the agent and the drilling fluid, and significantly improving treatment efficiency.

[0012] This utility model has the following beneficial effects: The graded purification design achieves the step-by-step removal of large particulate impurities, sand, and mud particles, solving the problem of low efficiency caused by the mixing treatment of traditional equipment and significantly improving the purification efficiency. The reagent addition system achieves uniform spraying and full mixing of reagents through the synergistic effect of the ring infusion pipe, multiple distributors and jet mixers, greatly improving the flocculation and sedimentation effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the distributor's structure; In the diagram: 1. Supply pump; 2. Supply tank; 3. Distributor; 31. Guide cone; 32. Liquid distribution ball; 4. Vibrating screen; 5. Infusion pipe; 6. Pretreatment tank; 7. Dosing tank; 8. Vacuum degasser; 9. Treatment tank one; 10. Left compartment; 11. Sand remover; 12. Baffle plate; 13. Right compartment; 14. Sludge remover; 15. Treatment tank three; 16. Centrifuge; 17. Treatment tank four; 18. Jet mixer; 19. Flocculant tank; 20. Inclined packing; 21. Sedimentation zone; 22. Treatment tank five; 23. Return pump. Detailed Implementation

[0014] The present invention will be further described below with reference to the embodiments.

[0015] Example 1, as Figures 1 to 2 As shown, this utility model is a drilling fluid tank purification system, including a tank assembly, a vibrating screen 4, a centrifuge 16, a desander cleaner 11, a mud cleaner 14, and a vacuum degasser 8. The tank assembly includes a pretreatment tank 6, a first treatment tank 9, a second treatment tank 15, a third treatment tank 17, and a fifth treatment tank 22 arranged sequentially. The vibrating screen 4 is located at the top left end of the pretreatment tank 6. A chemical dosing tank 7 is located on the top of the pretreatment tank 6. The second treatment tank has a partition plate 12 that divides it into a left compartment 10 and a right compartment 13. The partition plate 12 has a return port. The inlet and outlet of the desander cleaner 11 are... The left compartment 10 and the right compartment 13 are connected separately. The inlet and outlet of the sludge cleaner 14 are connected to the right compartment 13 and the third treatment tank 15, respectively. The inlet and outlet of the centrifuge 16 are connected to the third treatment tank 15 and the fourth treatment tank 17, respectively. The fourth treatment tank 17 is divided into a mixing zone and a sedimentation zone 21 by an overflow plate. The upper part of the sedimentation zone 21 is provided with an overflow port that connects to the fifth treatment tank 22. A jet mixer 18 is provided on the pipeline at the outlet of the centrifuge 16. The jet mixer 18 is connected to the flocculant tank 19 through a dosing pipe and a dosing pump. The inlet of the vacuum degasser 8 is connected to the first treatment tank 9, and the outlet is connected to the left compartment 10 of the second treatment tank.

[0016] Operating Procedure: After being screened by vibrating screen 4, the drilling fluid enters pretreatment tank 6, where large-diameter solid particles are removed during screening. In pretreatment tank 6, it mixes with chemicals added from dosing tank 7, then overflows into treatment tank 9. Vacuum degasser 8 removes dissolved gases from the drilling fluid. Subsequently, the drilling fluid overflows into the left compartment 10 of treatment tank 2. The drilling fluid in the left compartment 10 is pumped into desander 11 to remove sand-sized solid particles before flowing back to the right compartment 13. The drilling fluid in the right compartment 13 is pumped into desilter 14 to remove sand-sized solid particles. After removing fine mud particles, the drilling fluid is transported to treatment tank 15. The return port on the partition plate 12 ensures the liquid level balance and circulation treatment in the tank. The drilling fluid in treatment tank 15 is pumped into centrifuge 16 for deep solid-liquid separation. The separated drilling fluid enters jet mixer 18 and is fully mixed with flocculant transported from flocculant tank 19 to further remove fine particles. The mixed drilling fluid enters the mixing zone of treatment tank 17 and then overflows into sedimentation zone 21 for sedimentation. The clear liquid after sedimentation enters treatment tank 22 through the overflow port.

[0017] In Example 2, based on Example 1, agitators are installed in pretreatment tank 6, treatment tank 1 9, treatment tank 2, treatment tank 3 15, and treatment tank 4 17. Overflow plates are installed between treatment tank 1 9, treatment tank 2, and pretreatment tank 6. During processing, the agitator motor is activated, driving the agitator to rotate and agitate the drilling fluid.

[0018] The sedimentation zone 21 is equipped with inclined plate packing 20 at its upper part, with the overflow port located above the inclined plate packing 20. The inclined plate packing 20 enhances the settling of fine particles and prevents flocculent material from entering the overflow port. A filter screen or filter cloth can be installed at the overflow port. The bottom of the sedimentation zone 21 is equipped with a sediment collection tank, and a drain pipe is connected to the bottom of the sediment collection tank. The drain pipe can be connected to a sewage pump. The sand cleaner 11 is model NCS300, the mud cleaner 14 is model ZCN125, and the vacuum degasser 8 is model LZCQ / 3B.

[0019] A replenishment tank 2 is located at the left end of the pretreatment tank 6. A return pump 23 is connected to the pretreatment tank 6 (22). The outlet of the return pump 23 is connected to the replenishment tank 2 via a pipeline. The replenishment tank 2 is connected to a replenishment pump 1. The return pump 23 draws the slurry from the pretreatment tank 6 (22) to the replenishment tank 2, and then pumps it from the replenishment tank 2 to the wellhead via the replenishment pump 1 to replenish the wellhead mud. The replenishment pump 1 is a 2PN sand pump. The centrifuge 16 is a model LW600. The inner walls of each tank are protected against corrosion with anti-corrosion materials, extending their service life by more than 5 years.

[0020] The bottom of the pretreatment tank 6 is inclined with the right side higher than the left side, and a drain pipe is provided at the bottom left end of the pretreatment tank 6. The bottom of the tank assembly is provided with a base.

[0021] An annular infusion pipe 5 is fixed on the upper side wall of the pretreatment tank 6 below the vibrating screen 4. Multiple distributors 3 are evenly fixed at the bottom of the infusion pipe 5. The infusion pipe 5 is connected to the dosing tank 7 through the dosing pipeline. A dosing pump is installed on the dosing pipeline.

[0022] The distributor 3 includes a conduit fixed to the bottom of the infusion pipe 5. A flow guide cone 31 is fixed to the bottom of the conduit, and a vertical connecting end is provided at the bottom of the flow guide cone 31. A hemispherical liquid distribution ball 32 is fixed to the bottom of the connecting end, and liquid distribution holes are evenly distributed on the liquid distribution ball 32. During chemical dosing, the dosing pump draws the chemical from the dosing tank 7 and then delivers it into the infusion pipe 5. After being guided by the flow guide cone 31, it enters the liquid distribution ball 32 for uniform distribution, so that the chemical spraying area coincides with the drilling slurry screened and falling from the vibrating screen 4.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0024] In the description of this utility model, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A drilling fluid tank purification system, comprising a tank assembly, a vibrating screen (4), a centrifuge (16), a desander cleaner (11), a mud cleaner (14), and a vacuum degasser (8), wherein the tank assembly comprises a pretreatment tank (6), a first treatment tank (9), a second treatment tank, a third treatment tank (15), a fourth treatment tank (17), and a fifth treatment tank (22) arranged sequentially, characterized in that: A vibrating screen (4) is located at the top left end of the pretreatment tank (6). A dosing tank (7) is located at the top of the pretreatment tank (6). The treatment tank is divided into a left compartment (10) and a right compartment (13) by a partition plate (12). A return port is provided on the partition plate (12). The inlet and outlet of the sand cleaner (11) are connected to the left compartment (10) and the right compartment (13) respectively. The inlet and outlet of the mud cleaner (14) are connected to the right compartment (13) and the treatment tank respectively. Tank 3 (15) and centrifuge (16) are connected to treatment tank 3 (15) and treatment tank 4 (17) respectively. Treatment tank 4 (17) is divided into a mixing zone and a sedimentation zone (21) by an overflow plate. The sedimentation zone (21) is provided with an overflow port that connects to treatment tank 5 (22) at the top. A jet mixer (18) is provided on the pipeline at the outlet of centrifuge (16). The jet mixer (18) is connected to a flocculant tank (19) through a dosing pipe and a dosing pump.

2. The drilling fluid tank purification system according to claim 1, characterized in that: A stirrer is provided in each of the pretreatment tank (6), treatment tank 1 (9), treatment tank 2, treatment tank 3 (15) and treatment tank 4 (17), and an overflow plate 2 is provided between treatment tank 1 (9) and treatment tank 2 and pretreatment tank (6).

3. A drilling fluid tank purification system according to claim 1 or 2, characterized in that: The sedimentation zone (21) is equipped with inclined plate packing (20) at the top, and the overflow port is located above the inclined plate packing (20).

4. The drilling fluid tank purification system according to claim 1, characterized in that: The pretreatment tank (6) is equipped with a replenishment tank (2) at the left end. The treatment tank (22) is connected to a reflux pump (23). The outlet of the reflux pump (23) is connected to the replenishment tank (2) through a pipe. The replenishment tank (2) is connected to a replenishment pump (1).

5. The drilling fluid tank purification system according to claim 1, characterized in that: The bottom of the pretreatment tank (6) is inclined with the right side higher than the left side, and a drain pipe is provided at the bottom left end of the pretreatment tank (6).

6. The drilling fluid tank purification system according to claim 1, characterized in that: A ring-shaped infusion pipe (5) is fixed on the upper side wall of the pretreatment tank (6) below the vibrating screen (4). Multiple distributors (3) are evenly fixed at the bottom of the infusion pipe (5). The infusion pipe (5) is connected to the dosing tank (7) through the drug delivery pipeline. A drug pump is installed on the drug delivery pipeline.

7. A drilling fluid tank purification system according to claim 6, characterized in that: The distributor (3) includes a conduit fixed to the bottom of the infusion tube (5), a flow guide cone (31) fixed to the bottom of the conduit, a vertical connecting end at the bottom of the flow guide cone (31), a hemispherical liquid distribution ball (32) fixed to the bottom of the connecting end, and liquid distribution holes evenly provided on the liquid distribution ball (32).

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