A release device for a release of a drain

Abstract

The application discloses a release device of an open drain of an oil drain, which comprises an upper oil pipe, an open drain shell, an upper blocking cap, a supporting spring, a reducing joint, a lower blocking cap and a lower oil pipe, the inner diameter of the upper oil pipe is larger than that of the lower oil pipe, the upper oil pipe is connected with the lower oil pipe through the reducing joint, a through slot is formed on the open drain shell, the upper blocking cap is installed on the upper part of the open drain shell, the lower blocking cap is installed on the lower part of the open drain shell, and the device further comprises a lock rod, a lock claw, a suspension joint, a spring and a lock sleeve, the lower part of the lock claw is milled into a strip body, the lower part of the lock rod has a lock segment, the lock segment is provided with a suspension shoulder, the outer diameter of the lock segment is equal to the inner diameter of the lower part of the lock claw, the lock rod is installed in the lock claw, and the lower part of the lock claw is provided with an inner shoulder. The application guarantees reliable oil drainage of the oil well of the pressure-throwing oil drain, avoids causing environmental pollution and facilitates construction operation.

Description

Technical Field

[0001] This invention relates to equipment used during well workover in oilfield pumping wells, and more particularly to a release device for the release valve of an oil drain during well workover in oilfield pumping wells. Background Technology

[0002] Under normal circumstances, the pump on the tubing string has an inlet valve, which is a one-way valve. Fluid can only flow upwards and cannot flow downwards from the top of the inlet valve. During well workover operations, when the tubing is pulled up, the well fluid in the tubing above the pump will flow to the surface, causing environmental pollution and inconveniencing the operation. To solve this problem, a bleeder is installed on both the tubing and casing. Before pulling up the tubing during well workover operations, the bleeder is opened to connect the tubing and casing, allowing the well fluid in the tubing above the pump to drain into the casing, thus preventing the aforementioned problems.

[0003] There are many types of existing oil drainers. Among the existing technologies, CN2284297Y discloses a pressure-injection type oil drainer, used in ordinary pumping wells and also applicable to heavy oil pumping wells. The pressure-injection type oil drainer consists of an oil drainer and an opening device. The two ends of the oil drainer's outer shell are connected to upper and lower connectors, and a sliding sleeve is installed at the oil drain hole on the inner wall, with a spring below the sliding sleeve. A transverse through-slot is cut into the opening device's outer shell, containing a spring and a spring block. The oil drainer is installed at the upper end of the pumping unit, allowing the piston and other tools to pass smoothly through, ensuring a high success rate of operation. No impact force is required when opening, making this invention applicable not only to ordinary pumping wells but also to heavy oil pumping wells.

[0004] CN112377147A discloses an electrically controlled oil drainer, belonging to the technical field of oil production equipment. It includes: a main body connecting an oil pump and a tubing string, the main body comprising a bottom end connecting the oil pump and a top end connecting the tubing string; an axially oriented receiving cavity within the main body; a sleeve within the receiving cavity; a ring electromagnet at the bottom of the receiving cavity; an elastic element connected between the ring electromagnet and the sleeve; the ring electromagnet being electrically connected to the electrical functional unit of the tubing string; a radial first channel in the middle of the main body; and a radial second channel on the sleeve; when the ring electromagnet is energized, it generates magnetic attraction, causing the sleeve to move downwards along the receiving cavity, thus connecting the radial first channel and the radial second channel, achieving oil draining. This invention has a simple and reasonable structure, achieves oil pumping through electric control, reduces manual labor intensity, improves production efficiency, avoids sucker rod breakage, is stable and reliable in operation, extends service life, and reduces production costs.

[0005] CN213627517U discloses an oil drainer with anti-backflow function, including a main body, an oil drain hole, a sliding sleeve, and a retainer. The main body has an upper connector at its upper end and a lower connector at its lower end. The outer wall of the upper connector is threaded, and its lower end is fixedly connected to the upper end of the main body. The inner wall of the lower connector is threaded, and its upper end is fixedly connected to the lower end of the main body. A rubber ring is located at the upper end of the interior of the main body, and its upper end is fixedly connected to the lower end of the interior of the main body. A sliding sleeve is located at the lower end of the rubber ring, and a retainer is located at the lower end of the sliding sleeve. The sliding sleeve and the retainer are slidably connected. This invention uses a sliding sleeve and a spring instead of the traditional method of breaking a pin to expose the oil drain hole, making the oil draining operation of the oil drainer faster. At the same time, the spring and retainer facilitate timely resealing of the oil drain hole after draining to prevent crude oil backflow. Furthermore, it can be used continuously, making it very practical.

[0006] CN112796703A discloses a claw spring type sliding sleeve oil drainer, relating to the field of oilfield downhole tool technology. The upper tubing string has an upper stepped shaft at its upper part, on which an upper retaining ring is fitted. The upper retaining ring is fixedly connected to circumferentially distributed arc-shaped claw springs, which are fixedly connected to a lower retaining ring. The lower part of the lower retaining ring is a conversion sleeve, which is fitted onto the lower stepped shaft of the upper tubing string. A ring groove is formed on the upper end face of the lower tubing string below the conversion sleeve, connecting to a piston ring via a sealing ring with clearance fit. A side hole is formed on the lower tubing string at the bottom of the piston ring, communicating with the center hole of the lower tubing string. This invention has the following advantages: The arc-shaped claw springs are fixed to the inner wall of the casing by pressurizing the oil pump; the sliding sleeve cannot rotate by lifting the tubing; rotating the tubing causes the sheath to rise and expose the drain hole for oil drainage; lifting the tubing shears the pin, releasing the arc-shaped claw springs from the casing, allowing the tubing to be lifted smoothly. It features reliable casing fixation and oil drainage, and smooth tubing lifting after undoing fixation.

[0007] CN213980758U discloses an oil drainer for oil extraction, belonging to the field of oil extraction technology. This oil drainer includes a coupling, with a connecting pipe movably connected to the top of the inner wall of the coupling via a first thread. A conical plug is fixedly connected to the middle of the inner wall of the connecting pipe. This oil drainer, through the arrangement of a first oil outlet, a filter plate, a second oil outlet, and a sealing ring, utilizes the pressure difference between the inside and outside of the pump during operation to force oil out through the first oil outlet for draining. The oil, after coarse filtration by the filter plate, flows out through the second oil outlet. This results in the first oil outlet receiving crude oil, while the second oil outlet receiving oil after primary filtration, increasing working efficiency. The simultaneous opening of the first and second oil outlets alleviates internal pressure within the pipe body, ensuring the safe use of the drainer. The sealing ring prevents internal leakage, greatly enhancing sealing performance and preventing friction on the oil pipe, reducing wear.

[0008] However, the aforementioned drainers will cause the oil pipe on the pump to stop draining oil or to stop draining oil only halfway through the pumping process. The well fluid in the oil pipe on the pump will then flow to the ground, causing environmental pollution and making the operation and construction inconvenient. Summary of the Invention

[0009] The purpose of this invention is to provide a release device for an oil drainer, used in wells where the pump tubing is a combined tubing type with a pressure-released oil drainer. This overcomes the aforementioned problems, prevents the drainer from being damaged by collision at the reducing joint, ensures reliable oil draining in wells with pressure-released oil drainers, avoids environmental pollution, and facilitates operation.

[0010] The objective of this invention is achieved as follows: It includes an upper oil pipe, a drain valve housing, an upper stop cap, a support spring, spring blocks, a reducing connector, a lower stop cap, and a lower oil pipe. The inner diameter of the upper oil pipe is larger than that of the lower oil pipe. The upper oil pipe, the reducing connector, and the lower oil pipe are connected sequentially. The reducing connector has a reducing shoulder inside, and the lower inner diameter of the reducing connector is equal to the inner diameter of the lower oil pipe. A through groove is formed on the drain valve housing, and two spring blocks are symmetrically installed in this through groove. A support spring is installed between the two spring blocks. The upper stop cap is installed on the upper outer part of the release valve housing. The lower inner hole of the upper stop cap engages with the upper part of the spring block, preventing the upper part of the spring block from detaching from the release valve housing. The lower stop cap is installed on the lower outer part of the release valve housing. The upper inner hole of the lower stop cap engages with the lower part of the spring block, preventing the lower part of the spring block from detaching from the release valve housing. When the upper outer wall of the spring block contacts the lower inner part of the upper stop cap, and the lower outer wall of the spring block contacts the upper inner part of the lower stop cap, the outer edge dimensions of the two spring blocks are smaller than the inner diameter of the upper oil pipe and larger than... The inner diameter of the lower oil pipe is characterized by: including a locking rod, locking pawl, suspension joint, spring, and locking sleeve; the lower part of the locking pawl has an inner shoulder; the lower part of the locking pawl is milled into a strip; the lower part of the locking rod has a locking segment; a suspension shoulder is located above the locking segment; the outer diameter of the locking segment is equal to the lower inner diameter of the locking pawl; the locking rod is installed inside the locking pawl; the suspension shoulder sits on the inner shoulder, allowing the locking rod to be hooked onto the locking pawl; and the inner diameter of the upper end of the locking sleeve is equal to the lower outer diameter of the locking pawl. The inner diameter of the locking sleeve is smaller than the inner diameter of the lower oil pipe. The spring is installed in the suspension joint, and the locking claw is inserted into the suspension joint. The locking claw and the suspension joint are connected as one unit. The inner hole covers two spring blocks. The lower part of the locking rod is connected to the upper part of the release valve housing. The upper end of the locking sleeve covers the lower part of the locking claw, so that the strip milled into the lower part of the locking sleeve cannot expand. The upper shoulder of the locking sleeve is suspended at the lower part of the suspension joint, so that when the locking sleeve is in the suspended state in the suspension joint, it can only move upward and not downward.

[0011] The specific technical solution is as follows:

[0012] An oil drain release device includes an upper oil pipe, a drain housing, an upper stop cap, a support spring, a reducing connector, a lower stop cap, and a lower oil pipe.

[0013] The inner diameter of the upper oil pipe is larger than the inner diameter of the lower oil pipe. The upper oil pipe is connected to the lower oil pipe through the reducing joint. A through groove is formed on the outer shell of the release valve. The upper stop cap is installed on the upper part of the outer shell of the release valve, and the lower stop cap is installed on the lower part of the outer shell of the release valve.

[0014] It also includes a locking rod, a locking claw, a suspension connector, a spring, and a locking sleeve. The lower part of the locking claw is milled into a strip. The lower part of the locking rod has a locking section. The locking section has a suspension shoulder. The outer diameter of the locking section is equal to the lower inner diameter of the locking claw. The locking rod is installed inside the locking claw. The lower part of the locking claw has an inner shoulder.

[0015] Preferably, the suspension shoulder sits on the inner shoulder, the inner diameter of the upper port of the locking sleeve is equal to the lower outer diameter of the locking claw, the inner diameter of the inner hole of the locking sleeve is smaller than the inner diameter of the lower oil pipe, the lower part of the locking rod is connected to the upper part of the release valve housing, and the upper port of the locking sleeve covers the lower part of the locking claw.

[0016] Preferably, it also includes a spring block.

[0017] Preferably, there are two spring blocks.

[0018] Preferably, two of the spring blocks are symmetrically installed in the through groove, and a support spring is installed between the two spring blocks.

[0019] Preferably, the upper outer wall of the spring block is located inside the lower part of the upper stop cap, and the lower outer wall of the spring block is in contact with the upper part of the lower stop cap.

[0020] Preferably, the lower inner hole of the upper stop cap engages with the upper part of the spring block, and the upper inner hole of the lower stop cap engages with the lower part of the spring block.

[0021] Preferably, the reducing joint has a reducing shoulder inside.

[0022] The beneficial effects of this invention are as follows: When draining oil from a pumping well where the pump's upper tubing is a combined tubing, the components of this invention, excluding the upper tubing, reducer, and lower tubing, are assembled into a single unit and inserted into the upper tubing. When the locking sleeve reaches the reducer shoulder, it is blocked. Under the gravity of the relevant components, the spring is compressed, and the lower part of the locking claw descends into the lower part of the locking sleeve. The lower part of the locking claw loses its constraint and expands to an internal diameter larger than the outer diameter of the locking rod, allowing the drainer to be released and smoothly fall into the lower tubing, and then onto the pressure-operated drainer. The spring block on the drainer will not collide with the reducer shoulder, and the drainer will not be damaged. Therefore, this invention achieves its objective, ensuring reliable oil drainage from the well where the pressure-operated drainer has been installed, avoiding environmental pollution, and facilitating construction operations. Attached Figure Description

[0023] Figure 1This is an assembly diagram of an embodiment of the drain release device of the oil drainer described in this invention;

[0024] Figure 2 yes Figure 1 Enlarged view of the middle part of the oil drainer's release mechanism;

[0025] Figure 3 yes Figure 1 Half-sectional view of the center locking bar;

[0026] Figure 4 yes Figure 1 Outline diagram of the locking claw. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] See appendix Figure 1 The embodiments of the present invention include an upper oil pipe 2, a locking rod 3, a locking claw 4, a suspension joint 5, a spring 6, a locking sleeve 7, a release device housing 8, an upper stop cap 9, a support spring 10, a spring block 11, a reducing joint 12, a lower stop cap 13, and a lower oil pipe 14. The inner diameter of the upper oil pipe 2 is larger than the inner diameter of the lower oil pipe 14 (in the field, the upper oil pipe 2 is generally an oil pipe with an inner diameter of Φ76mm, and the lower oil pipe 14 is generally an oil pipe with an inner diameter of Φ62mm). The upper oil pipe 2, the reducing joint 12, and the lower oil pipe... Pipes 14 are connected in sequence. The reducer 12 has a reducer shoulder 12-1 inside. The lower inner diameter of the reducer 12 is equal to the inner diameter of the lower oil pipe 14. A through groove is opened on the drain valve housing 8, in which two spring blocks 11 are symmetrically installed. A support spring 10 is installed between the two spring blocks 11. An upper stop cap 9 is installed on the upper part of the drain valve housing 8. The lower inner hole of the upper stop cap 9 engages with the upper part of the spring block 11, preventing the upper part of the spring block 11 from detaching from the drain valve housing 8. (See attached diagram) Figure 2 The lower stop cap 13 is installed on the lower part of the release valve housing 8. The upper inner hole of the lower stop cap 13 engages with the lower part of the spring block 11, preventing the lower part of the spring block 11 from detaching from the release valve housing 8. When the upper outer wall of the spring block 11 contacts the lower inner wall of the upper stop cap 9, and the lower outer wall of the spring block 11 contacts the upper inner wall of the lower stop cap 9, the outer edge dimensions of the two spring blocks 11 are smaller than the inner diameter of the upper oil pipe 2 and larger than the inner diameter of the lower oil pipe 14 (because it must be larger than the inner diameter of the sliding sleeve on the injection type oil pump, and the inner diameter of the sliding sleeve is larger than the inner diameter of the lower oil pipe 14). See Appendix. Figure 4 The lower part of the locking claw 4 has an inner shoulder 4-1, and the difference in diameter between the lower outer parts of the locking claw 4 forms an outer shoulder 4-2. The lower part of the locking claw 4 is milled into a strip shape. See Appendix. Figure 3 The lower part of the locking rod 3 has a locking section 3-2, and above the locking section 3-2 is a suspension shoulder 3-1. The outer diameter of the locking section 3-2 is equal to the lower inner diameter of the locking claw 4. The locking rod 3 is installed inside the locking claw 4. The suspension shoulder 3-1 sits on the inner shoulder 4-1, so that the locking rod 3 is hooked onto the locking claw 4. The inner diameter of the upper end of the locking sleeve 7 is equal to the lower outer diameter of the locking claw 4. The inner diameter of the inner hole 7-1 of the locking sleeve 7 is smaller than the inner diameter of the lower oil pipe 14 (the diameter difference is 0.5mm-2mm). The spring 6 is installed inside the suspension joint 5, and the locking claw 4 is inserted into the suspension joint 5. Inside, the locking claw 4 is integrated with the suspension connector 5 (the figure shows a threaded connection, but other connection methods can also be used). The inner hole 7-1 covers the two spring blocks 11. The lower part of the locking rod 3 is connected to the upper part of the release valve housing 8. The upper end of the locking sleeve 7 covers the lower part of the locking claw 4, preventing the strip milled at the lower part of the locking sleeve 7 from expanding. The upper shoulder of the locking sleeve 7 is suspended at the lower part of the suspension connector 5 (a pin is horizontally installed at the lower part of the suspension connector 5, and the inner end of the pin blocks the locking sleeve 7), so that when the locking sleeve 7 is in a suspended state inside the suspension connector 5 (as shown in the figure), it can only move upwards and cannot move downwards. A weight rod 1 is installed on the upper part of the locking rod 3. The weight rod 1 is generally 1-6 sucker rods.

[0029] The release valve housing 8, upper stop cap 9, support spring 10, spring block 11, and lower stop cap 13 constitute the release valve of the pressure-type oil release device. The release valve has the same structure as the release valve in Chinese Patent No. 97206011.1 "Pressure-type Oil Release Device".

[0030] When draining oil from a pumping well where the pump's upper tubing is a combination tubing, the components of this invention, excluding the upper tubing 2, reducer 12, and lower tubing 14, are assembled into a single unit and inserted into the upper tubing 2. When the locking sleeve 7 reaches the reducer shoulder 12-1, it is blocked. Under the weight of the components, the spring 6 is compressed, and the lower part of the locking claw 4 descends into the lower part of the locking sleeve 7. The lower part of the locking claw 4, no longer constrained, expands to a size larger than the outer diameter of the locking rod 3, allowing the drainer to be released and smoothly fall into the lower tubing 14, eventually landing on the pressure-operated drainer. The spring block 11 on the drainer will not collide with the reducer shoulder 12-1, and the drainer will not be damaged.

[0031] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A release device for an oil drainer, comprising an upper oil pipe, a locking rod, a locking claw, a suspension connector, a spring, a locking sleeve, a drainer housing, an upper stop cap, a support spring, spring blocks, a reducing connector, a lower stop cap, and a lower oil pipe. The inner diameter of the upper oil pipe is larger than the inner diameter of the lower oil pipe. The upper oil pipe, the reducing connector, and the lower oil pipe are connected in sequence. The reducing connector has a reducing shoulder inside, and the lower inner diameter of the reducing connector is equal to the inner diameter of the lower oil pipe. A through groove is formed on the drainer housing, and two spring blocks are symmetrically installed in this through groove. A support spring is installed between the two spring blocks. The upper stop cap is installed on the upper outer part of the vent housing. The lower inner hole of the upper stop cap engages with the upper part of the spring block, preventing the upper part of the spring block from detaching from the vent housing. The lower stop cap is installed on the lower outer part of the vent housing. The upper inner hole of the lower stop cap engages with the lower part of the spring block, preventing the lower part of the spring block from detaching from the vent housing. When the upper outer wall of the spring block contacts the lower inner wall of the upper stop cap, and the lower outer wall of the spring block contacts the upper inner wall of the lower stop cap, the outer edge dimensions of the two spring blocks are smaller than the oiling area. The inner diameter of the pipe is larger than that of the lower oil pipe. The lower part of the locking claw has an inner shoulder, and the difference in outer diameter of the lower part of the locking claw forms an outer shoulder. The lower part of the locking claw is milled into a strip. The lower part of the locking rod has a locking section, and a suspension shoulder is above the locking section. The outer diameter of the locking section is equal to the lower inner diameter of the locking claw. The locking rod is installed inside the locking claw. The suspension shoulder sits on the inner shoulder, so that the locking rod is hooked onto the locking claw. The inner diameter of the upper end of the locking sleeve is equal to the lower outer diameter of the locking claw. The inner diameter of the inner hole of the locking sleeve is smaller than that of the lower oil pipe. The inner diameter of the pipe, the spring is installed in the suspension joint, the locking claw is inserted into the suspension joint, the locking claw and the suspension joint are connected as one piece, the inner hole covers two spring blocks, the lower part of the locking rod is connected to the upper part of the release valve housing, the upper end of the locking sleeve covers the lower part of the locking claw, so that the strip formed by the milling of the lower part of the locking claw cannot expand, the upper shoulder of the locking sleeve is suspended at the lower part of the suspension joint, so that when the locking sleeve is in the suspended state in the suspension joint, it can only move upward and not downward, and a weight rod is installed on the upper part of the locking rod, the weight rod is a sucker rod.

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