Jam releasing device for wellhead sealing component of steam injection producing well

Abstract

The utility model discloses an unfreezing device for a wellhead sealing component of a steam injection producing well, which is provided with an impactor, and a slideway is arranged in the impactor with a split structure; the impact body can be installed outside the polish rod and can slide up and down outside the polish rod along the sliding way. The anti-blocking device is simple in structure, and can be conveniently mounted outside the polish rod and slide up and down along the polish rod after the polish rod is blocked. The unblocking device is used for removing blocking among the polish rod, the plunger and the metal sealing cylinder for the thermal recovery gasoline injection well, is simple and effective, works safely and reliably, and remarkably improves the construction efficiency of unblocking operation. The purchase cost of production materials such as the polish rod and a wellhead sealing device is saved, the workload of well control and polish rod replacement is reduced, the production cost and the construction cost are greatly reduced, the use effect is remarkable, and good economic benefits can be obtained.

Description

Technical Field

[0001] The utility model belongs to a device for releasing a light rod after steam injection operation in an oil production well, in particular to a device for releasing a sealing component at a wellhead of a steam injection oil production well. Background Art

[0002] In the heavy oil extraction of the petroleum industry, most of the methods are to inject high-temperature and high-pressure steam into the oil layer from the wellhead to increase the thermal energy of the oil layer, improve the fluidity of crude oil, and facilitate the extraction of heavy oil.

[0003] When injecting high-temperature and high-pressure steam, a very precise sealing system is required. The physical effect of thermal expansion and contraction caused by the temperature difference between high-temperature steam injection and normal temperature production can easily lead to steam leakage in the wellhead sealing device, posing a safety hazard. The wellhead sealing device consists of a rubber sealing box composed of a primary rubber sealing tube and a secondary rubber sealing tube, and a gap seal formed between a metal plunger and a metal sealing tube. When the gasoline injection well is mechanically produced, it relies on the rubber sealing box for sealing; when injecting steam, it is necessary to use the rubber sealing box seal and the gap seal between the metal plunger and the metal sealing tube at the same time to achieve the purpose of safe steam injection.

[0004] Steam injection uses 15mPa, 350℃ high-pressure steam, and the wellhead rubber seal is the weakest link in the entire steam injection system. This is because in mechanical oil production, the rod and the wellhead are sealed with a rubber seal when the pumping rod moves up and down. As the temperature rises, the toughness of the rubber seal component decreases, thus losing its sealing effect, which may cause serious accidents such as blowouts during steam injection. In order to avoid accidents caused by the above reasons, a metal seal method combining a metal sealing cylinder and a metal plunger is used at the bottom of the wellhead rubber seal to improve the safety of steam injection operations.

[0005] Before steam injection, the polished rod needs to be lifted up so that the plunger installed at the bottom of the polished rod can enter the sealing cylinder fixed at the bottom of the small four-way pipe at the wellhead. The gap between the two is very small, which can achieve the purpose of blocking the upward flow of steam during steam injection. After steam injection, the polished rod is lowered, and the metal plunger is separated from the metal sealing cylinder by the weight of the sucker rod, the metal seal is released, and the mechanical oil production process using rubber seal is started.

[0006] Since there are substances such as crude oil and water between the plunger and the sealing cylinder, the high temperature during steam injection can cause the colloidal substances therein to solidify and coke, filling and bonding between the plunger and the sealing cylinder and filling the gap therein, so that the two are tightly stuck together, so that the two cannot be separated by the gravity of the sucker rod alone. This is commonly known as "bare rod stuck" because the lower part of the bare rod is connected to the plunger, just like the bare rod is stuck.

[0007] The method to remove the above-mentioned light rod jam is generally to rotate the light rod so that the plunger rotates with the light rod in the sealing tube to achieve the purpose of unblocking. However, the situation that the light rod can be rotated is not common. At the same time, when the light rod is rotated, the rebound force generated by the light rod is huge, which poses a major safety hazard. Therefore, this method is no longer allowed. In the end, the only way to remove the above-mentioned light rod jam is to kill the well and release the pressure in the well. After the safety measures are improved, the wellhead can be disassembled, the light rod and the entire wellhead sealing device can be replaced.

[0008] After searching, there are currently several patent technologies related to unblocking by light rod: CN202220438006.7 discloses a light rod jarring unblocking device. The above utility model relates to the technical field of oil drilling equipment, which is a light rod jarring unblocking device, including a locking mechanism capable of clamping the light rod and a driving mechanism capable of moving the locking mechanism up and down. The utility model has a reasonable and compact structure. When a well-stuck accident occurs in a rod pump oil production system, the utility model is installed on the upper part of the rod sealer, the driving mechanism is started, and the fixed block is driven upward. The rod is stuck due to the well-stuck accident, so the fixed block moves upward relative to the rod, and the rod is stretched. When the tension value is greater than the shear force of the shear nails, the shear nails are sheared off, and the rod generates a downward impact force, which produces a shock effect on the stuck well part, thereby achieving the purpose of unblocking. The utility model can unblock the well at the first time when a well-stuck accident occurs, avoiding more serious well-stuck accidents caused by long-term well shutdown and the resulting decrease in oil well production. It has the characteristics of flexible installation, maintenance, simple operation, high efficiency and significant economic benefits.

[0009] However, when the polished rod is pulled upward and a certain pulling force is reached, the shear pins are disconnected, the polished rod and the sucker rod are elastically contracted, and a downward impact force is generated to achieve the purpose of unblocking. This device has a safety hazard that the impact force is not easy to control. This device is mainly used to solve the well-blocking accident of the sucker rod in the well.

[0010] CN201821943999.3 discloses an oil well unstuck tool. The utility model provides an oil well unstuck tool, including: a supporting device; a fixing device, which is adjustably arranged on the supporting device, the fixing device is inserted on the light rod or the sucker rod, the fixing device includes a first fixing component and a second fixing component, the second fixing component is arranged at intervals from the first fixing component, and the second fixing component is located above the first fixing component; a fastener is arranged on the light rod or the sucker rod, the fastener is arranged at one end of the first fixing component away from the second fixing component or at one end of the second fixing component away from the first fixing component; a driving device is telescopically arranged on the first fixing component, and the driving device continues to move after extending to abut against the second fixing component to apply a force to the light rod or the sucker rod through the fixing device and the fastener. The technical solution provided by the utility model can solve the technical problem in the prior art that the light rod or the sucker rod is not easy to unstuck after being stuck.

[0011] However, the above utility model has a complex structure, a short impact distance, a small impact force, and is not easy to successfully release the jam. Summary of the invention

[0012] The purpose of the utility model is to provide a device for releasing the wellhead sealing components of a steam injection oil production well, so as to solve the problem that after the steam injection operation in the oil well, the sealing plunger installed at the lower part of the light rod and the sealing cylinder fixed at the lower end of the small four-way at the wellhead cannot be separated. The utility model can deal with the light rod jamming accident caused by the coking and adhesion of the colloidal substances in the high-temperature and high-pressure steam between the sealing plunger and the sealing cylinder, and remove the adhesion and jamming between the plunger and the sealing cylinder, so that the light rod can descend smoothly. The utility model can avoid the safety hazards caused by rotating the light rod to release the jam, and the high material costs and construction costs caused by disassembling the wellhead device and replacing the light rod and the entire set of wellhead sealing devices. The utility model can reduce production costs, improve the construction efficiency of steam injection oil production wells, and improve economic benefits.

[0013] The technical solution of the utility model is: a steam injection oil production well wellhead sealing component unblocking device is provided with an impact body, and a slideway is provided in the impact body of the split structure; the impact body can be installed outside the polished rod and can slide up and down outside the polished rod along the slideway.

[0014] Preferably, the impact body is two semicircular bodies, the slideway is an arc-shaped groove and is arranged at the center of the two semicircular bodies, and the aperture formed by the slideway after the slideway is matched is larger than the outer diameter of the polished rod.

[0015] Preferably, one side of the two semicircular mating bodies of the impact body is connected together by a connecting block welded to the outside of the impact body and a rotating shaft, and the other side is fixed together by a mating block welded to the outside of the impact body and a fixing bolt.

[0016] Preferably, the upper ends of the two semicircular matching bodies of the impact body are fixed with lifting rings, and the two lifting rings can be connected to the pull rope.

[0017] Preferably, the other end of the pull rope can be connected to a small hook of a lifting device or can be passed around the top of the oil pump and then held tightly by the operator's hand.

[0018] Preferably, an impact block is fixed to the lower ends of the two semicircular mating bodies of the impact body.

[0019] Preferably, the impact block is a semicircular block and is fixed on the outer periphery of the slideway of the impact body; the impact block is made of copper alloy material.

[0020] Preferably, the weight of the impact body is set to be above 50 kg.

[0021] Compared with the prior art, the remarkable use effect of the utility model is that the utility model utilizes the impact force generated by free fall to achieve the purpose of separating the plunger installed at the lower part of the bare rod from the metal sealing cylinder. It is particularly suitable for handling stuck plungers and bare rod failures in heavy oil thermal recovery and steam injection oil wells, and is an important tool to ensure the normal production of thermal recovery and gasoline injection wells.

[0022] The utility model utilizes the energy provided by the free fall and takes the polished rod as the running track of the impact body. The inner diameter of the slideway in the impact body is slightly larger than the outer diameter of the polished rod, and the impact force is large and concentrated.

[0023] The utility model has a simple structure, and the impact body is a split structure, which is easy to install and use. When the polished rod is blocked, it can be conveniently installed outside the polished rod and can slide up and down along the polished rod. When a downward force is applied to the impact body, its impact direction can be automatically controlled and its sliding can be accelerated, so that a violent impact can be generated on the polished rod clip below and the polished rod can be pushed downward; after multiple impacts and vibrations, the plunger installed below the polished rod can move downward from the metal sealing cylinder held therein.

[0024] The impact force required after the smooth rod and the plunger are blocked can be adjusted at will with the height of the impact body, which is simple and easy to operate. The bottom of the impact body is equipped with an impact block, which is made of copper alloy material to avoid sparks when the impact body collides with the smooth rod clip, eliminating safety hazards.

[0025] The utility model is easy to operate, and the construction personnel can master the use method after a little training; the device is highly practical, and has been tested on site, with a success rate of 100%. The whole construction time is about 90 minutes each time; if the polished rod and wellhead sealing device are replaced, it will not only increase the production cost, but also take at least 6 hours to construct.

[0026] 6. The utility model is used to remove the jam between the polished rod, plunger and metal sealing cylinder for thermal recovery gasoline injection wells. It is simple and effective, safe and reliable, and significantly improves the construction efficiency of the jam removal operation. It eliminates the helpless situation of removing the polished rod and replacing the wellhead device to remove the jam of the wellhead sealing device, saves the purchase cost of production materials such as the polished rod and the wellhead sealing device, reduces the workload of well control and replacement of the polished rod, greatly reduces the production cost and construction cost, has a significant use effect and can achieve good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is the front view of the utility model; Figure 2 yes Figure 1 Left view of Figure 3 yes Figure 1 A top view of Figure 4 The utility model is a structural schematic diagram of a steam injection wellhead using the utility model.

[0029] Figure 5 The utility model is a schematic diagram of the unblocking construction state at the steam injection wellhead.

[0030] In the figure: impact body 1, slideway 2, fixing bolt 3, rotating shaft 4, lifting ring 5, impact block 6;

[0031] Steam injection gate 7, small four-way valve 8, oil pipe string 9, plunger 10, metal sealing cylinder 11, primary rubber sealing cylinder 12, secondary rubber sealing cylinder 13, bare rod 14, steam 15, production gate 16, pull rope 17, bare rod clip 18, rubber sealing box 19, casing 20. DETAILED DESCRIPTION

[0032] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] See also Figure 1 - Figure 5 A steam injection well seal component unblocking device is provided, which is provided with an impact body 1, and a slideway 2 is provided in the impact body 1 of the split structure; the impact body 1 can be installed outside the polished rod 14 and can slide up and down outside the polished rod 14 along the slideway 2.

[0036] The utility model has a simple structure. The impact body 1 is a split structure. When the polished rod is blocked, it can be installed outside the polished rod 14 and can slide up and down along the polished rod 14. When the impact body 1 moves with acceleration under the action of gravity, it can produce a violent impact on the polished rod clip 18 below and push the polished rod 14 downward; after multiple impacts and vibrations, the plunger 10 installed below the polished rod 14 can move downward from the metal sealing cylinder 11 held therein.

[0037] The utility model uses the energy provided by the free fall of an object and uses the impact method to make the plunger 10 installed at the lower part of the light rod 14 detach from the metal sealing tube 11. In the utility model, the light rod 14 becomes the running track of the impact body 1, so that the impact force does not cause lateral displacement, and accurately acts on the light rod clip 18. The firmly fixed light rod clip 18 can push the light rod 14 to move downward, and the light rod 14 pushes the plunger 10 to move downward in the metal sealing tube 11. After multiple impacts, the plunger 10 slowly withdraws from the metal sealing tube 11. The operation is simple and effective, the work is safe and reliable, and the construction efficiency of the unblocking operation is significantly improved. There is no need to disassemble the light rod and replace the wellhead device to unblock the sealing device of the wellhead, which greatly reduces the production cost and construction cost, has a significant use effect and can achieve good economic benefits.

[0038] On the basis of the above-mentioned embodiment 1, the utility model also has the following embodiments: a preferred embodiment: the impact body 1 is two semicircular mating bodies, the slide 2 is an arc-shaped groove and is arranged at the center of the two semicircular mating bodies, and the aperture formed by the mating slide 2 is larger than the outer diameter of the light rod 14, so that the impact process is smooth, and the huge impact force applied each time can act entirely on the light rod clip 18.

[0039] A preferred embodiment: one side of the two semicircular mating bodies of the impact body 1 is connected together by a connecting block welded on the outside of the impact body 1 and a rotating shaft 4, and the other side is fixed together by a mating block welded on the outside of the impact body 1 and a fixing bolt 3. The fixing bolt 3 can conveniently fix the two semicircular bodies of the impact body 1 together, making it easy to install and operate outside the polished rod 14; the rotating shaft 4 connects the two semicircular bodies of the impact body 1 through the connecting block, which is convenient for separation and closing.

[0040] A preferred embodiment: a lifting ring 5 is fixed to the upper ends of the two semicircular matching bodies of the impact body 1 , and the two lifting rings 5 ​​can be connected to the pull rope 17 .

[0041] A preferred embodiment: the other end of the pull rope 17 can be connected to a small hook of a lifting device or passed through the top of the pumping unit and then held by the operator's hand. The lifting device drives the pull rope 17 and the impact body 1 to implement the unblocking operation of the bare rod 14, and the impact force is large and the labor intensity can be significantly reduced; the unblocking operation is also very convenient by manpower, and the impact body 1 can move up and down smoothly along the slide 2, and the unblocking task can also be easily completed.

[0042] A preferred embodiment: the lower ends of the two semicircular mating bodies of the impact body 1 are fixed with impact blocks 6. The impact points can be concentrated around the polished rod 14, and the slideway 2 can surround the polished rod 14, so that the device can always move up and down safely along the polished rod 14, and the impact block 6 can be used to concentrate the impact force on the polished rod clip 18 on the outer periphery of the polished rod 14.

[0043] A preferred embodiment: the impact block 6 is a semicircular block and is fixed on the outer periphery of the slideway 2 of the impact body 1; the impact block 6 is made of copper alloy material, such as brass, bronze, beryllium bronze, etc. The impact block 6 made of copper alloy material is installed at the bottom of the impact body 1. The manufacturing cost is not high, and no sparks will be generated during impact. It meets the safety requirements when used at the oil well production site.

[0044] A preferred embodiment: the weight of the impact body 1 is set to be above 50 kg. The weight of the impact body 1 is set to be above 50 kg, such as 50 kg, 55 kg, 60 kg, 65 kg, etc. If the weight is too large, it will be inconvenient to use and waste materials. If the weight is too small, the impact force will be insufficient.

[0045] The jam-releasing construction method of the utility model is as follows: Figure 4 and Figure 5 On both sides of the wellhead small four-way 8 of the steam injection oil production well are the steam injection gate 7 and the production gate 16 respectively. The top of the small four-way 8 is equipped with a primary rubber sealing cylinder 12 and a secondary rubber sealing cylinder 13 as a wellhead sealing device during mechanical oil production.

[0046] The metal sealing cylinder 11 is fixed at the lower end of the small four-way 8, and the plunger 10 is fixed at the lower part of the polished rod 14 and can enter the metal sealing cylinder 11, so as to seal the oil wellhead during the steam injection construction.

[0047] During steam injection, the injected high-temperature and high-pressure steam 15 enters the annulus between the oil pipe string 9 and the sealing tube 11 through the steam injection gate 7 and moves downward along the annulus to the oil layer outside the casing 20 with the perforated section.

[0048] During the unblocking construction, firstly, tighten the polished rod clip 18 at a position about 10 cm above the rubber sealing box 19 composed of the primary rubber sealing tube 12 and the secondary rubber sealing tube 13 at the bottom of the polished rod 14; open the impact body 1 left and right along the rotating shaft 4, the impact body 1 falls on the polished rod clip 18 and the polished rod 14 is sleeved in the middle, tighten the fixing bolts 3, integrate the two semicircular matching bodies into one, and the impact body 1 can slide freely up and down outside the polished rod 14.

[0049] The top of the polished rod 14 is fixed on the large hook of the lifting equipment so that the polished rod 14 is vertical and does not tilt. The other end of the pull rope 17 is fixed to the small hook of the lifting equipment, or the other end of the pull rope 17 is passed around the drum on the top of the belt pumping unit or the donkey head of the beam pumping unit. Behind the pumping unit, the pull rope 17 is pulled by manpower to pull the impact body 1 to a height of about 4 meters above the polished rod clip 18. The pull rope 17 is released, and the impact body 1 falls freely. The impact block 6 made of copper alloy material at the bottom of the impact body 1 can avoid sparks when violently colliding with the polished rod clip 18. The polished rod clip 18 transmits the impact force to the polished rod 14, and the polished rod 14 transmits the impact force downward to the plunger 10, so that the plunger 10 moves downward, because the metal sealing cylinder 11 is firmly fixed on the small four-way 8, and no displacement occurs. After multiple impacts, the plunger 10 will be disengaged from the metal sealing cylinder 11 little by little, achieving the purpose of unblocking.

[0050] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A device for releasing the seal components at the wellhead of a steam injection oil production well, characterized in that: An impact body is provided, and a slideway is provided in the impact body of the split structure; the impact body is two semicircular matching bodies, the slideway is an arc-shaped groove and is arranged at the center of the two semicircular matching bodies, and the aperture formed by the matching slideway is larger than the outer diameter of the polished rod; the impact body can be installed outside the polished rod and can slide up and down outside the polished rod along the slideway of the impact body.

2. A steam injection oil production wellhead sealing component release device as claimed in claim 1, characterized in that: One side of the two semicircular mating bodies of the impact body is connected together by a connecting block welded outside the impact body and a rotating shaft, and the other side is fixed together by a mating block welded outside the impact body and a fixing bolt.

3. A steam injection oil production wellhead sealing component release device as claimed in claim 2, characterized in that: The upper ends of the two semicircular matching bodies of the impact body are fixed with lifting rings, and the two lifting rings can be connected with the pull rope.

4. A steam injection oil production wellhead sealing component release device as claimed in claim 3, characterized in that: The other end of the pull rope can be connected to a small hook of a lifting device or can be passed around the top of the pumping unit and then held tightly by the operator's hand.

5. A steam injection oil production wellhead sealing component release device as claimed in claim 4, characterized in that: The lower ends of the two semicircular matching bodies of the impact body are fixed with impact blocks.

6. A steam injection oil production wellhead sealing component release device as claimed in claim 5, characterized in that: The impact block is a semicircular block and is fixed on the outer periphery of the slideway of the impact body; the impact block is made of copper alloy material.

7. A steam injection oil production wellhead sealing component release device as claimed in claim 6, characterized in that: The weight of the impact body is set to be more than 50 kg.

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