Automatic blowout-preventing repair-strain efficient environment-friendly wellhead sealing device

Abstract

The application discloses an automatic blowout-preventing repairing scratch high-efficiency environment-friendly wellhead sealing device, relates to the technical field of wellhead sealing devices, and comprises a packing box, a polished rod is passed through the packing box, the packing box is internally provided with a packing for sealing, and the upper end of the packing box is a packing box upper standby cap; the device further comprises a grinding head and a roller, the outer side of the packing box upper standby cap is fixedly connected with an insertion plate track, a blowout-preventing insertion plate is slidably arranged in the insertion plate track, the packing box upper standby cap is internally provided with an insertion slot for the insertion of the blowout-preventing insertion plate, the upper side of the blowout-preventing insertion plate is movably connected with a grinding head mounting seat, and the grinding head and the roller are detachably mounted on the grinding head mounting seat; and the grinding head or the roller mounted on the grinding head mounting seat can abut against the polished rod. The application solves the problem that the wellhead sealing device is prone to oil and gas leakage after the polished rod is scratched, and has very excellent polished rod scratch repairing and polished rod fracture blowout-preventing effects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wellhead sealing devices, and particularly relates to an automatic blowout-preventing and high-efficiency and environment-friendly wellhead sealing device for repairing scratches. BACKGROUND

[0002] At present, with the deepening of oilfield development, the difficulty of exploitation gradually increases. The oilfield has long been applied to the tertiary oil recovery technology such as the ternary compound flooding oil, the corrosive and alkaline substances in the produced liquid increase, and the sand content in the underground flow increases, the corrosion and scratch of the produced liquid on the polished rod of the pumping unit increase, the polished rod has erosion pits and scratches, the pits and scratches have a great influence on the sealing effect of the original wellhead device, the sealing device is not tightly sealed at the pits and scratches of the polished rod, and the oil and gas leakage occurs. Frequent replacement of the polished rod and the packing box reduces the efficiency of the pumping unit well. SUMMARY

[0003] In order to solve the problems mentioned in the background, the application provides an automatic blowout-preventing and high-efficiency and environment-friendly wellhead sealing device for repairing scratches, which has a polished rod polishing head, can repair scratches and pits on the polished rod online, and reduces oil and gas leakage caused by scratches and pits. Meanwhile, the application also has a broken rod blowout-preventing structure, the blowout-preventing structure is perfectly combined with the polishing head, and the double effects of polished rod repair and broken rod blowout prevention are realized through the most simplified design.

[0004] The technical scheme provided by the application is as follows: an automatic blowout-preventing and high-efficiency and environment-friendly wellhead sealing device for repairing scratches, which comprises a packing box, a polished rod passes through the packing box, the packing box is provided with packing for sealing, the packing is sealed around the polished rod, and the upper end of the packing box is a packing box upper cap. The application also comprises a grinding head and a roller, the outer side of the packing box upper cap is fixedly connected with a plug-in rail, the plug-in rail is slidably provided with a blowout-preventing plug, correspondingly, the packing box upper cap is provided with a plug-in slot for the blowout-preventing plug, the blowout-preventing plug is inserted into the plug-in slot after the polished rod is broken, the upper end of the blowout-preventing plug is movably connected with a grinding head mounting seat, the grinding head and the roller are detachably mounted on the grinding head mounting seat, when the polished rod does not need to be ground, the roller is mounted on the grinding head mounting seat, the roller rolls in friction with the polished rod, and sliding friction of the blowout-preventing plug with the polished rod is avoided; when the polished rod needs to be ground, the roller is removed and the grinding head is mounted, the grinding head slides in friction with the polished rod, and the polishing and repair of the polished rod are realized through the up-down movement of the polished rod and the rotary movement of the plug-in rail following the packing box upper cap.

[0005] A further technical scheme is that the outer side of the polished rod is provided with a composite layer, and the surface roughness Ra of the composite layer is less than 0.8 um.

[0006] A further technical scheme is that the outer side of the polished rod is provided with a composite layer, and the composite layer is made of stainless steel.

[0007] Further technical solutions are: the slot is a dovetail slot, and the blowout prevention plugboard part matched with the slot is an isosceles trapezoidal plate.

[0008] Further technical solutions are: a threaded end of the plugboard track away from the polished rod is screwed with an adjusting jack, the adjusting jack extends into the plugboard track, an ejection spring is arranged in the plugboard track, and the two ends of the ejection spring are respectively abutted against the adjusting jack and the blowout prevention plugboard.

[0009] The technical solutions provided by the present application have the following advantages:

[0010] 1. The present application has a grinding head, which can repair scratches and pits of the polished rod without stopping the machine, thereby improving the sealing performance of the wellhead sealing device, reducing the replacement frequency of the polished rod and the packing box, and further improving the working efficiency of the pumping unit well.

[0011] 2. The present application has a high-sensitivity blowout prevention assembly, which can automatically and timely seal the well and prevent blowout after the polished rod is broken, thereby solving the environmental protection problem of well fluid spouting and polluting the environment due to the broken polished rod.

[0012] 3. The present application adds a layer of high-strength and high-smoothness composite pipe to the outside of the polished rod, thereby improving the corrosion resistance, wear resistance and surface smoothness of the polished rod, and further improving the sealing capacity between the polished rod and the wellhead sealing device. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the overall cross-sectional view of the present application.

[0014] Figure 2 is the cross-sectional view of the cap on the packing box in the present application.

[0015] Figure 3 is the structure schematic view of the polished rod with a composite layer in the present application.

[0016] In the figure: 1, cap on the packing box; 2, adjusting jack; 3, plugboard track; 4, ejection spring; 5, grinding head mounting seat; 6, blowout prevention plugboard; 7, grinding head; 8, roller; 9, upper end cover; 10, composite layer. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0018] As Figure 1As shown, the embodiment includes a packing box, the polish rod passes through the packing box, the packing box is filled with a packing for sealing, the packing is sealed around the polish rod, and the upper end of the packing box is a threaded and rotatable packing box upper cap 1.

[0019] The structural innovation of the embodiment is that the outer side of the packing box upper cap 1 is fixedly connected with a plug-in plate track 3, the plug-in plate track 3 is slidably provided with a blowout prevention plug-in plate 6, and correspondingly, the packing box upper cap 1 is provided with a plug-in slot for the blowout prevention plug-in plate 6 to be inserted into, and after the polish rod is broken, the blowout prevention plug-in plate 6 is inserted into the plug-in slot. Figure 2 As shown, the plug-in slot is dovetail-shaped, and the blowout prevention plug-in plate 6 matched with the plug-in slot is part of an isosceles trapezoidal plate, the dovetail-shaped plug-in slot can limit and bind the blowout prevention plug-in plate 6, preventing the blowout prevention plug-in plate 6 from flying due to the spray force. In order to facilitate processing, the dovetail-shaped plug-in slot is located at the end of the packing box upper cap 1, and an upper end cover 9 is fixedly and weldedly connected above the packing box upper cap 1.

[0020] A grinding head mounting seat 5 is movably connected above the blowout prevention plug-in plate 6, the grinding head mounting seat 5 is detachably provided with a grinding head 7 and a roller 8; when the polish rod does not need to be ground, the roller 8 is installed on the grinding head mounting seat 5, the roller 8 rolls against the polish rod, which can avoid the blowout prevention plug-in plate 6 from sliding against the polish rod, and the rolling friction is smaller than the sliding friction, which is more conducive to protecting the polish rod. When the polish rod needs to be ground, the roller 8 is removed and replaced with the grinding head 7, the grinding head 7 slides against the polish rod, which can repair the scratches and pits of the polish rod without stopping the machine, and the smooth surface of the polish rod guarantees the sealing of the sealing packing, thereby improving the sealing of the wellhead sealing device, reducing the replacement frequency of the polish rod and the packing box, and further improving the working efficiency of the pumping unit well.

[0021] As shown, the plug-in slot is dovetail-shaped, and the blowout prevention plug-in plate 6 matched with the plug-in slot is part of an isosceles trapezoidal plate, the dovetail-shaped plug-in slot can limit and bind the blowout prevention plug-in plate 6, preventing the blowout prevention plug-in plate 6 from flying due to the spray force. In order to facilitate processing, the dovetail-shaped plug-in slot is located at the end of the packing box upper cap 1, and an upper end cover 9 is fixedly and weldedly connected above the packing box upper cap 1. Figure 3 As shown, the plug-in slot is dovetail-shaped, and the blowout prevention plug-in plate 6 matched with the plug-in slot is part of an isosceles trapezoidal plate, the dovetail-shaped plug-in slot can limit and bind the blowout prevention plug-in plate 6, preventing the blowout prevention plug-in plate 6 from flying due to the spray force. In order to facilitate processing, the dovetail-shaped plug-in slot is located at the end of the packing box upper cap 1, and an upper end cover 9 is fixedly and weldedly connected above the packing box upper cap 1.

[0022] In order to realize the adjustment of the grinding force of the grinding head 7, the scheme provided by the embodiment is that the adjusting jack 2 is threadedly connected to one end of the plug plate track 3 away from the polished rod, the adjusting jack 2 extends into the plug plate track 3, the ejecting spring 4 is arranged in the plug plate track 3, the two ends of the ejecting spring 4 abut against the adjusting jack 2 and the blowout prevention plug plate 6 respectively, the blowout prevention plug plate 6 has a tendency to be close to the polished rod under the action of the ejecting spring 4, when the polished rod is broken, the blowout prevention plug plate is quickly ejected into the backup cap 1 on the packing box to form a seal under the action of the ejecting spring 4, and therefore, the blowout prevention assembly with high sensitivity in the embodiment can automatically and timely seal the well and prevent blowout after the polished rod is broken, and the environmental protection problem that well fluid is sprayed to pollute the environment after the polished rod is broken is solved.

[0023] At present, the wellhead site of an oil field in China has completed the trial stage of the present application, and satisfactory results have been achieved. After using the present application, the replacement frequency of the polished rod and the packing box is greatly reduced, in other words, the service life of the polished rod and the packing box is prolonged, thus saving the consumption of oil field consumable parts. The cost of the present application is not high, and after popularization and use, the present application can bring considerable cost benefits to the oil field.

Claims

1. An automatic blowout preventer, repair, high-efficiency and environmentally friendly wellhead sealing device, comprising a packing box, a polished rod passing through the packing box, packing for sealing being installed inside the packing box, and a top cap (1) at the upper end of the packing box; characterized in that: It also includes a grinding head (7) and a roller (8). The outer side of the packing box cap (1) is fixedly connected to a plate rail (3). A blowout preventer plate (6) is slidably arranged in the plate rail (3). The packing box cap (1) has a slot for inserting the blowout preventer plate (6). A grinding head mounting seat (5) is movably connected above the blowout preventer plate (6). The grinding head (7) and the roller (8) can be detachably mounted on the grinding head mounting seat (5). The grinding head (7) or the roller (8) mounted on the grinding head mounting seat (5) can abut against the polished rod. The polished rod has a composite layer (10) on its outer side. The composite layer (10) is made of stainless steel and is formed by cold rolling. One end of the insert track (3) away from the light rod is threaded with an adjusting screw (2). The adjusting screw (2) extends into the insert track (3). An ejector spring (4) is installed in the insert track (3). The two ends of the ejector spring (4) abut against the adjusting screw (2) and the blowout preventer (6) respectively. Under the elastic force of the ejector spring (4), the blowout preventer (6) tends to move closer to the light rod.

2. The automatic blowout prevention and repair device for high-efficiency and environmentally friendly wellhead sealing as described in claim 1, characterized in that: The outer side of the optical rod is covered with a composite layer (10), and the surface roughness Ra of the composite layer (10) is <0.8 μm.

3. The automatic blowout prevention and repair device for high-efficiency and environmentally friendly wellhead sealing as described in claim 1, characterized in that: The slot is a dovetail groove, and the anti-spray plate (6) that mates with the slot is an isosceles trapezoidal plate.

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