A sump assembly and water injection pump to avoid crankcase oil emulsification

Abstract

The utility model relates to reciprocating water injection pump used in oil exploitation production, disclose a kind of to avoid crankcase oil emulsification's envelope assembly and water injection pump.Be equipped with flow guide hole on packing press ring, when leakage water flows to the gap between plunger and guide ring in turn by the gap between plunger and envelope, the gap between plunger and packing assembly, leakage water changes direction at guide hole, by guide hole flows to the space between adjusting nut and envelope end portion, and the pressure and flow rate of leakage water are slowed down by the inner wall of adjusting nut.Subsequently, using the flow guide hole on adjusting nut, leakage water gathered in the space between adjusting nut and envelope end portion is guided out of envelope assembly.Change the injection direction of leakage water in envelope assembly, avoid the situation that leakage water splashes to ejector rod to emulsify oil;In addition, without the erosion of sewage, low-friction oil seal can also be used, thereby improving the service life of ejector rod.

Description

Technical Field

[0001] This utility model relates to a reciprocating water injection pump used in oil extraction and production, specifically to a plenum assembly and water injection pump that prevents crankcase oil emulsification. Background Technology

[0002] As oil exploration and development deepen, extraction becomes increasingly difficult. To achieve high and stable crude oil production, most methods involve injecting water (or oil) into underground oil reservoirs to replenish energy. Currently, in the sealing body of reciprocating water injection pumps, oil emulsification occurs because the medium leaks axially and is carried into the crankcase by the piston rod. The emulsification process is as follows:

[0003] In existing water injection pumps, the medium leaks axially during operation. This medium is typically sprayed from the crankcase, where the plunger is located, through the gap between the adjusting nut and the plunger. Since the water used by plunger pumps is generally wastewater with a high salt content, and the plunger's surface temperature is high during high-speed reciprocating motion, the salt from the wastewater splashed onto the plunger quickly crystallizes on its surface. This crystallized salt has high hardness. With the high-speed reciprocating motion of the plunger, the crystallized salt on the plunger damages the oil seal between the crankcase seal and the plunger, increasing the gap between the plunger surface and the seal. Subsequently, wastewater splashed onto the plunger will enter the crankcase with the plunger's reciprocating motion, causing the engine oil in the crankcase to emulsify. Utility Model Content

[0004] To address the aforementioned deficiencies in the existing technology, a plenum assembly and water injection pump are provided to prevent crankcase oil emulsification, thus avoiding the problem of sewage entering the crankcase and causing oil emulsification.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A plenum assembly for preventing crankcase oil emulsification is provided. The plenum assembly is fitted onto a plunger connected to a push rod inside the crankcase. The plenum assembly comprises a plenum fitted onto the plunger and an adjusting nut. An annular space surrounding the plunger is provided at one end of the plenum near the plunger. Within the annular space, a guide ring, a packing assembly, and a packing pressure ring are sequentially fitted. The packing pressure ring is positioned close to the adjusting nut. The adjusting nut is fixed to the plenum and presses the guide ring, packing assembly, and packing pressure ring tightly within the annular space. Several circumferential guide holes are provided on both the annular pressure ring and the adjusting nut. Leaking water is intercepted by the guide holes and flows out of the plenum assembly through the guide holes.

[0007] According to the above technical solution, after tightening the adjusting nut, the downward-sloping guide hole on the adjusting nut is opened, and the upward-sloping guide hole is sealed; the guide hole on the annular pressure ring is in the normally open state.

[0008] According to the above technical solution, the guide hole located on the uppermost side of the adjusting nut is used as the lubricating oil filling hole.

[0009] According to the above technical solution, by controlling the tightness of the adjusting nut, a certain leakage vector is maintained between the adjusting nut and the packing pressure ring. The leakage vector is determined according to the actual working conditions.

[0010] According to the above technical solution, the adjusting nut includes an adjusting nut body and a sealing and guide band disposed in the adjusting nut body. An annular groove is provided on the inner wall of the through hole that matches the plunger of the adjusting thread body. The shape of the annular groove matches the shape of the sealing and guide band.

[0011] According to the above technical solution, the packing assembly is composed of two or more types of open packing rings with automatic compensation function arranged alternately.

[0012] A water pump that avoids crankcase oil emulsification is characterized by employing a cavity assembly for avoiding crankcase oil emulsification as described above.

[0013] According to the above technical solution, a sealing box is provided on the crankcase, and the push rod passes through the sealing box and connects to the crankshaft inside the crankcase; multiple layers of sealing rings and pressure plates are provided on the sealing box, and the pressure plate adopts an annular pressure plate, the inner diameter of the pressure plate matches the outer diameter of the push rod, the pressure rod is located on the front and rear sides of the sealing box, and is fixed to the sealing box by bolts; the sealing rings adopt Step seals and O-rings.

[0014] According to the above technical solution, the crankcase includes a housing, a crankshaft disposed in the housing, a connecting rod connected to the other end of the crankshaft, and a push rod connected to the other end of the connecting rod via a crosshead. The connecting rod passes through a sealing box and is connected to a plunger.

[0015] This utility model has the following beneficial effects:

[0016] 1. A guide hole is provided on the packing ring. When leaking water flows sequentially from the gap between the plunger and the gland, the gap between the plunger and the guide ring, and the gap between the plunger and the packing assembly to the gap between the plunger and the guide ring, the leaking water changes direction at the guide hole and flows into the space between the adjusting nut and the end of the gland. The pressure and flow rate of the leaking water are reduced by the inner wall of the adjusting nut. Subsequently, the guide hole on the adjusting nut guides the leaking water collected in the space between the adjusting nut and the end of the gland out of the gland assembly. Based on the above measures, the spray direction of the leaking water in the gland assembly is changed, preventing leaking water from splashing onto the push rod and avoiding damage to the oil seal and oil emulsification. Furthermore, without the corrosion of sewage, a low-friction oil seal can be used, thereby improving the service life of the push rod.

[0017] 2. Sealing the guide hole at the top of the adjusting nut can prevent leaked water from spraying out from the top of the adjusting nut and then falling onto the top rod by gravity.

[0018] 3. Use the guide hole on the uppermost side of the adjusting nut as a lubricating oil filling hole. Setting a lubricating oil filling hole can effectively improve the service life of the plunger and packing, and greatly reduce the operating cost of the equipment.

[0019] 4. By controlling the tightness of the adjusting nut, a certain leakage vector is maintained between the adjusting nut and the packing ring, and the leaked water can be used to cool the plunger and packing assembly. Attached Figure Description

[0020] Figure 1 This utility model provides an embodiment;

[0021] Figure 2 This utility model provides an embodiment;

[0022] In the diagram, 1. Top rod; 2. Piston; 3. Gland body; 4. Adjusting nut; 4-1. Adjusting nut body; 4-2. Seal; 4-3. Guide band; 5. Guide ring; 6. Packing assembly; 7. Packing pressure ring; 8. Flow guide hole; 9. Sealing box; 10. Multi-layer sealing ring; 11. Pressure plate; 12. Housing; 13. Crankshaft; 14. Connecting rod; 15. Crosshead. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Reference Figures 1-2 As shown, this utility model provides a plenum assembly that prevents crankcase oil emulsification.

[0025] Example 1

[0026] The plenum assembly is fitted onto the plunger 2, which is connected to the push rod 1 inside the crankcase. The plenum assembly includes a plenum 3 fitted onto the plunger and an adjusting nut 4. An annular space surrounding the plunger is provided at one end of the plenum near the plunger. Within the annular space, a guide ring 5, a packing assembly 6, and a packing pressure ring 7 are sequentially fitted onto the guide ring 5. The packing pressure ring is positioned close to the adjusting nut. The adjusting nut is fixed onto the plenum and presses the guide ring, packing assembly, and packing pressure ring tightly within the annular space. Several guide holes 8 are provided circumferentially on both the annular pressure ring and the adjusting nut. Leaking water is intercepted by the guide holes and flows out of the plenum assembly through the guide holes.

[0027] In existing water injection pumps, the medium leaks axially during operation. This medium is typically sprayed from the crankcase, where the plunger is located, through the gap between the adjusting nut and the plunger. Since the water used by plunger pumps is generally wastewater with a high salt content, and the plunger's surface temperature is high during high-speed reciprocating motion, the salt from the wastewater splashed onto the plunger quickly crystallizes on its surface. This crystallized salt has high hardness. With the high-speed reciprocating motion of the plunger, the crystallized salt on the plunger damages the oil seal between the crankcase seal and the plunger, increasing the gap between the plunger surface and the seal. Subsequently, wastewater splashed onto the plunger will enter the crankcase with the plunger's reciprocating motion, causing the engine oil in the crankcase to emulsify.

[0028] In this embodiment, a guide hole is provided on the packing ring. When leaking water flows sequentially from the gap between the plunger and the plenum, the gap between the plunger and the guide ring, and the gap between the plunger and the packing assembly to the gap between the plunger and the guide ring, the leaking water changes direction at the guide hole and flows into the space between the adjusting nut and the end of the plenum. The pressure and flow rate of the leaking water are reduced by the inner wall of the adjusting nut. Subsequently, the guide hole on the adjusting nut is used to guide the leaking water collected in the space between the adjusting nut and the end of the plenum out of the plenum assembly. Based on the above measures, the spray direction of the leaking water in the plenum assembly is changed, preventing leaking water from splashing onto the push rod and avoiding damage to the oil seal and oil emulsification. Furthermore, since there is no sewage corrosion, a low-friction oil seal can be used, thereby improving the service life of the push rod.

[0029] Example 2

[0030] The structure and principle of Example 2 are similar to those of Example 1, except that after tightening the adjusting nut, the downward-sloping guide hole on the adjusting nut is opened, while the upward-sloping guide hole is sealed; the guide hole on the annular pressure ring is normally open. Sealing the guide hole at the top of the adjusting nut prevents leaked water from spraying out from the top of the adjusting nut and then falling onto the top rod due to gravity. Preferably, the adjusting nut has 6 guide holes, but other numbers of guide holes can also be provided.

[0031] In this embodiment, the guide hole on the uppermost side of the adjusting nut can also be used as a lubricating oil filling hole. Setting a lubricating oil filling hole can effectively improve the service life of the plunger and packing, and greatly reduce the operating cost of the equipment.

[0032] Example 3

[0033] The structure and principle of Example 3 are similar to those of Example 1, except that a certain leakage vector is maintained between the adjusting nut and the packing ring by controlling the tightness of the adjusting nut. The leakage vector is determined according to the actual working conditions. In this example, maintaining a certain leakage vector allows the leaked water to cool the plunger, and excess leaked water can flow out of the plenum assembly through the guide hole. When the leakage vector is too large, the adjusting nut is tightened to control the leakage vector within the allowable range.

[0034] Example 4

[0035] The structure and principle of Example 4 are similar to those of Example 1, except that the adjusting nut includes an adjusting nut body 4-1, a seal 4-2 and a guide band 4-3 disposed within the adjusting nut body, and an annular groove is provided on the inner wall of the through hole that matches the plunger. The shape of the annular groove matches the shape of the seal and the guide band, thereby preventing axial leakage of leaking water. In the example shown in the figure, the seal is a 28-step seal.

[0036] The packing assembly consists of alternating arrangements of two or more types of open packing rings with automatic compensation function.

[0037] This utility model also provides a water pump that avoids crankcase oil emulsification, using the aforementioned crankcase oil emulsification prevention assembly.

[0038] In some embodiments, a sealing box 9 is provided on the crankcase, and a push rod passes through the sealing box and is connected to the crankshaft inside the crankcase; multiple layers of sealing rings 10 and pressure plates 11 are provided on the sealing box, the pressure plates are annular pressure plates, the inner diameter of the pressure plates matches the outer diameter of the push rod, the pressure rods are located on the front and rear sides of the sealing box and are fixed to the sealing box by bolts; the sealing rings are Step seals and O-rings.

[0039] Furthermore, the crankcase includes a housing 12, a crankshaft 13 disposed within the housing, a connecting rod 14 connected to the other end of the crankshaft, and a push rod connected to the other end of the connecting rod via a crosshead 15. The connecting rod passes through a sealing box and is connected to a plunger.

[0040] The above are merely preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the protection scope of the present utility model.

Claims

1. A plenum assembly for preventing crankcase oil emulsification, the plenum assembly being fitted onto a plunger connected to an inner push rod in the crankcase, characterized in that: The plenum assembly includes a plenum fitted onto the plunger and an adjusting nut. At one end of the plenum near the plunger, there is an annular space surrounding the plunger. Within the annular space, a guide ring, a packing assembly, and a packing pressure ring are sequentially fitted. The packing pressure ring is positioned close to the adjusting nut, which is fixed to the plenum and presses the guide ring, packing assembly, and packing pressure ring tightly within the annular space. Several guide holes are circumferentially provided on both the annular pressure ring and the adjusting nut. Leaking water is intercepted by the guide holes and flows out of the plenum assembly.

2. The crankcase oil emulsification prevention assembly according to claim 1, characterized in that: After tightening the adjusting nut, open the downward-sloping guide hole on the adjusting nut and seal the upward-sloping guide hole; the guide hole on the annular pressure ring is in the normally open state.

3. The crankcase oil emulsification prevention assembly according to claim 1, characterized in that: Use the guide hole on the uppermost side of the adjusting nut as the lubricating oil filling hole.

4. The crankcase oil emulsification prevention assembly according to claim 1, characterized in that: By controlling the tightness of the adjusting nut, a certain leakage vector is maintained between the adjusting nut and the packing ring. The leakage vector is determined according to the actual working conditions.

5. The crankcase oil emulsification prevention assembly according to claim 1, characterized in that: The adjusting nut includes an adjusting nut body and a seal and guide band disposed within the adjusting nut body. An annular groove is provided on the inner wall of the through hole that matches the plunger of the adjusting thread body. The shape of the annular groove matches the shape of the seal and guide band.

6. The crankcase oil emulsification prevention assembly according to claim 1, characterized in that: The packing assembly consists of alternating arrangements of two or more types of open packing rings with automatic compensation function.

7. A water injection pump that avoids crankcase oil emulsification, characterized in that: The crankcase oil emulsification avoidance assembly is adopted as described in any one of claims 1-6.

8. The water injection pump for preventing crankcase oil emulsification according to claim 7, characterized in that: A sealing box is provided on the crankcase, and the push rod passes through the sealing box and connects to the crankshaft inside the crankcase. The sealing box is provided with multiple layers of sealing rings and pressure plates. The pressure plates are annular pressure plates, and the inner diameter of the pressure plates matches the outer diameter of the push rods. The pressure rods are located on the front and rear sides of the sealing box and are fixed to the sealing box with bolts. The sealing rings are Step seals and O-rings.

9. The water injection pump for preventing crankcase oil emulsification according to claim 8, characterized in that: The crankcase includes a housing, a crankshaft housed within the housing, a connecting rod connected to the other end of the crankshaft, and a push rod connected to the other end of the connecting rod via a crosshead. The connecting rod passes through a sealing box and is connected to a plunger.

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