An injection-production integrated sliding sleeve switch

Abstract

The cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove, and the cam is provided with an axially extending groove,

Description

Technical Field

[0001] The invention relates to equipment for oil field production, in particular to an injection-production integrated sliding sleeve switch. Background Art

[0002] One method for extracting heavy oil in oil fields involves injecting high-temperature steam into the reservoir to reduce its viscosity and enable extraction with a wellbore pump. Wellbore pumps have an inlet valve that restricts fluid flow upward, preventing downward flow. Therefore, when injecting steam into the reservoir, the pump cannot be used. Instead, the steam injection string must be lowered downward. Once the steam injection is complete, the steam injection string is pulled out, and then the wellbore pumped in is lowered. Due to the high well pressure after steam injection, the wellhead cannot be opened to pull the string out. This operation can only be performed after the blowout ends and the wellhead pressure drops. To address this issue, technicians developed an integrated injection-production wellbore pump (in the field, a steam injection string with an wellbore pump attached, through which steam is injected, is called an integrated injection-production string. A wellbore pump that meets this requirement is called an integrated injection-production pump, and this process is called an integrated injection-production process, or simply "injection-production integrated"). For example, Patent No. 98208542.7 discloses a long plunger self-draining oil well pump. When the long plunger is placed in the pump barrel, steam injection and other operations cannot be performed. Steam injection and other operations can only be performed after the long plunger is lifted out of the pump barrel. Since the pump stroke is generally about 6 meters, and the sealing surface between the pump barrel and the plunger is 1.2 meters, the above-mentioned oil well pump needs to be lifted up by more than 7.2 meters to perform steam injection and other operations. This requires the raising of a sucker rod (usually a polished rod). When the steam injection is completed and the pumping is switched to the well, the sucker rod (usually a polished rod) must be lowered into the well again. As can be seen from the above description, when this type of oil well pump is used in an integrated injection-production tubing string, it is still necessary to wait until the wellhead pressure drops after the steam injection is completed and the blowout is released before the pumping can be switched to the well. In addition, the pumping must be powered by a power device before the pumping can be switched to the well. This prevents the oil well from being switched to the well in a timely manner, affecting the health of the oil well. In addition, the switching process is complex, time-consuming, and expensive. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated injection and production sliding sleeve switch, so that when a pump is used to inject steam, the steam in the oil pipe on the pump can be injected into the oil layer, and there is no need to open the wellhead for operation after the pressure drops, and no power equipment is required, thereby shortening the pumping time.

[0004] The object of the present invention is achieved in that it comprises an upper sealing cylinder, an upper sealing member, a connecting joint, a lower sealing member, a connecting sleeve, a lower sealing cylinder, a sucker rod joint, and a piston rod, the connecting joint is provided with an outer connecting groove, the lower sealing cylinder is provided with an inner release hole, a reduced diameter section and a lower outer diameter section are provided on the piston rod, the lower outer diameter section is below the reduced diameter section, an inner connecting groove is provided at the middle and upper part of the connecting sleeve, a clamping claw is milled at the lower part of the connecting sleeve, the outer diameter of the head of the clamping claw is larger than the inner diameter of the lower inner hole section of the lower sealing cylinder, the clamping claw can reduce and expand the diameter, the upper sealing cylinder, the connecting joint, and the lower sealing cylinder are connected in sequence, the upper sealing member is installed in the upper sealing cylinder or the connecting joint, the upper seal is above the outer connecting groove, the lower seal is installed in the lower sealing cylinder or the connecting joint, the lower seal is below the outer connecting groove, the inner release hole is below the lower seal, the sucker rod joint is connected to the upper part of the piston rod, and the piston rod penetrates the connecting sleeve The cam is located above the upper seal, and the outer shoulder of the connecting sleeve is located below the lower seal. The upper seal and the lower seal seal the gap between the outer wall of the connecting sleeve and the inner wall of the connecting joint.

[0005] The beneficial effects of the present invention are as follows: when the oil pump connected below the lower sealing cylinder and the piston rod is at the lower starting point, the piston rod is connected into one through the claws, and the present invention is in an open state. Steam can be injected into the oil layer through the internal and external connecting grooves. When the steam injection is completed and pumping needs to be switched, the ground uses the pumping unit to prevent the impact distance, and the piston rod drives the connecting sleeve upward. The internal and external connecting grooves do not correspond, and the external connecting groove is closed by the connecting sleeve, and the oil well can be started for production. There is no need to wait for the pressure to drop before opening the wellhead for operation before switching to pumping, thus realizing the integration of injection and production, shortening the pumping time, making the oil well produce earlier, and reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of the present invention. Implementation Method

[0007] Let's combine Figure 1 The embodiments of the present invention are described.

[0008] like Figure 1As shown, the embodiment of the present invention includes an upper sealing cylinder 1, an upper sealing member 2, a connecting joint 3, a lower sealing member 4, a connecting sleeve 5, a lower sealing cylinder 6, a sucker rod joint 7, and a piston rod 8. The connecting joint 3 has an outer connecting groove 3-1, the lower sealing cylinder 6 has an inner release hole 6-1, the piston rod 8 has a reduced diameter section 8-1 and a lower outer diameter section 8-2, the lower outer diameter section 8-2 is located below the reduced diameter section 8-1, the middle and upper part of the connecting sleeve 5 has an inner connecting groove 5-1, the lower part of the connecting sleeve 5 is milled with a claw 5-2, the outer diameter of the head of the claw 5-2 is larger than the lower inner hole section 6-2 of the lower sealing cylinder 6. The inner diameter of the clamping claw 5-2 can reduce and expand the diameter, the upper sealing cylinder 1, the connecting joint 3, and the lower sealing cylinder 6 are connected in sequence, the upper seal 2 is installed in the upper sealing cylinder 1 or the connecting joint 3, the upper seal 2 is above the outer connecting groove 3-1, the lower seal 4 is installed in the lower sealing cylinder 6 or the connecting joint 3, the lower seal 4 is below the outer connecting groove 3-1, the inner release hole 6-1 is below the lower seal 4, the sucker rod joint 7 is connected to the upper part of the piston rod 8, the piston rod 8 is inserted into the connecting sleeve 5, so that the inner wall of the head of the clamping claw 5-2 is in the reducing position. At the diameter section 8-1, the connecting sleeve 5 is installed in the upper sealing cylinder 1, the connecting joint 3, and the lower sealing cylinder 6. When the outer shoulder of the connecting sleeve 5 is positioned on the upper shoulder of the lower inner hole section 6-2 of the lower sealing cylinder 6, the inner connecting groove 5-1 corresponds to the outer connecting groove 3-1, and the fluid in the connecting sleeve 5 can flow outside the present invention. After the connecting sleeve 5 is installed in the lower sealing cylinder 6, the outer wall of the head of the clamping claw 5-2 is forced to shrink by the lower inner hole section 6-2. After the outer wall of the head of the clamping claw 5-2 is forced to shrink by the lower inner hole section 6-2, the clamping claw 5 -2 has a head inner diameter smaller than the outer diameter of the lower outer diameter section 8-2. When the head of the claw 5-2 is at the inner release hole 6-1, after the head of the claw 5-2 expands, the head inner diameter of the claw 5-2 can be larger than the outer diameter of the lower outer diameter section 8-2. The inner connecting groove 5-1 is above the upper seal 2, and the outer shoulder of the connecting sleeve 5 is below the lower seal 4. The upper seal 2 seals the gap between the upper outer wall of the connecting sleeve 5 and the inner wall of the connecting joint 3, and the lower seal 4 seals the gap between the lower outer wall of the connecting sleeve 5 and the inner wall of the connecting joint 3.

[0009] The present invention is connected to the oil pump. When the oil pump rod is lowered to touch the pump, the present invention is in the open state. Figure 1As shown, steam can be injected into the oil layer through the inner connecting groove 5-1 and the outer connecting groove 3-1. When the steam injection is completed and the pumping is required, the ground is provided with a pumping unit to prevent the impact (no operating equipment is required). The piston rod 8 drives the connecting sleeve 5 upward, so that the inner connecting groove 5-1 is not corresponding to the outer connecting groove 3-1. When the inner connecting groove 5-1 is above the upper sealing member 2, the outer connecting groove 3-1 is closed by the connecting sleeve 5, and the oil well can be pumped and produced.

[0010] The inner diameter of the limiting hole 1-1 of the upper sealing cylinder 1 is smaller than the upper outer diameter of the connecting sleeve 5. After the connecting sleeve 5 is limited by the limiting hole 1-1, the clamping claw 5-2 reaches the release hole 6-1, and the clamping claw 5-2 expands outward due to elasticity. The clamping claw 5-2 escapes from the reduced diameter section 8-1, and the connecting sleeve 5 is locked in the closed position.

[0011] The outer diameter of the lower end of the sucker rod joint 7 is larger than the lower inner diameter of the connecting sleeve 5. When the outer connecting groove 3-1 needs to be closed, the sucker rod is lowered from the surface via the pumping unit. When the lower end of the sucker rod joint 7 reaches the inner shoulder of the connecting sleeve 5, the reduced diameter section 8-1 aligns with the head of the claw 5-2. The tapered surface at the lower end of the claw 5-2 head or the tapered surface at the lower end of the release hole 6-1 acts to reduce the diameter of the claw 5-2 head, allowing the connecting sleeve 5 to descend. When the outer shoulder of the connecting sleeve 5 seats on the upper shoulder of the lower inner bore section 6-2 of the lower sealing cylinder 6, the inner connecting groove 5-1 can once again align with the outer connecting groove 3-1. Therefore, the present invention allows for multiple steam injections (known on-site as rotations).

[0012] In order to save material and processing costs, the connecting sleeve 5 and the lower sealing cylinder 6 can be designed as an assembly.

Claims

1. An injection-production integrated sliding sleeve switch, comprising an upper sealing cylinder (1), an upper sealing member (2), a connecting joint (3), a lower sealing member (4), a connecting sliding sleeve (5), a lower sealing cylinder (6), a sucker rod joint (7), and a piston rod (8), characterized in that: The connecting joint (3) has an external connecting groove (3-1), the lower sealing cylinder (6) has an internal release hole (6-1), the piston rod (8) has a reduced diameter section (8-1) and a lower outer diameter section (8-2), the lower outer diameter section (8-2) is located below the reduced diameter section (8-1), the middle upper part of the connecting sleeve (5) has an internal connecting groove (5-1), the lower part of the connecting sleeve (5) is milled with a clamping claw (5-2), the outer diameter of the head of the clamping claw (5-2) is larger than the inner diameter of the lower inner hole section (6-2) of the lower sealing cylinder (6), the clamping claw (5-2) can reduce and expand the diameter, the upper sealing cylinder (1), the connecting joint (3), and the lower sealing cylinder (6) are connected in sequence, and the upper sealing member (2) is installed on the upper sealing cylinder ( 1), and the upper seal (2) is located at the upper end of the connecting joint (3), the upper seal (2) is located above the outer connecting groove (3-1), the lower seal (4) is installed in the lower sealing cylinder (6), and the lower seal (4) is located at the lower end of the connecting joint (3), the lower seal (4) is located below the outer connecting groove (3-1), the inner release hole (6-1) is located below the lower seal (4), the sucker rod joint (7) is connected to the upper part of the piston rod (8), the piston rod (8) is inserted into the connecting sleeve (5), so that the inner wall of the head of the claw (5-2) is located at the reduced diameter section (8-1), the connecting sleeve (5) is installed in the upper sealing cylinder (1), ... In the through-connector (3) and the lower sealing cylinder (6), when the outer shoulder of the connecting sleeve (5) is positioned on the upper shoulder of the lower inner hole section (6-2) of the lower sealing cylinder (6), the inner connecting groove (5-1) corresponds to the outer connecting groove (3-1). After the connecting sleeve (5) is installed in the lower sealing cylinder (6), the outer wall of the head of the clamping claw (5-2) is forced to shrink in diameter by the lower inner hole section (6-2). After the outer wall of the head of the clamping claw (5-2) is forced to shrink in diameter by the lower inner hole section (6-2), the inner diameter of the head of the clamping claw (5-2) is smaller than the outer diameter of the lower outer diameter section (8-2). When the head of the clamping claw (5-2) is in the inner release hole (6 -1), after the head of the clamping claw (5-2) expands, the inner diameter of the head of the clamping claw (5-2) can be larger than the outer diameter of the lower outer diameter section (8-2), the inner connecting groove (5-1) is located above the upper sealing member (2), the outer shoulder of the connecting sleeve (5) is located below the lower sealing member (4), the upper sealing member (2) and the lower sealing member (4) seal the gap between the outer wall of the connecting sleeve (5) and the inner wall of the connecting joint (3), the inner diameter of the limiting hole (1-1) of the upper sealing cylinder (1) is smaller than the upper outer diameter of the connecting sleeve (5), and after the connecting sleeve (5) is limited by the limiting hole (1-1), the clamping claw (5-2) reaches the inner release hole (6-1); The outer diameter of the lower end of the sucker rod joint (7) is larger than the inner diameter of the lower part of the connecting sleeve (5). When the lower end of the sucker rod joint (7) reaches the inner shoulder of the connecting sleeve (5), the reduced diameter section (8-1) corresponds to the head of the claw (5-2). When the outer shoulder of the connecting sleeve (5) sits on the upper shoulder of the lower inner hole section (6-2) of the lower sealing cylinder (6), the inner connecting groove (5-1) can correspond to the outer connecting groove (3-1) again.

Images