CN212671695U - Recoverable rubber plug for surface cementing of petroleum drilling - Google Patents
Recoverable rubber plug for surface cementing of petroleum drilling Download PDFInfo
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- CN212671695U CN212671695U CN202021116024.0U CN202021116024U CN212671695U CN 212671695 U CN212671695 U CN 212671695U CN 202021116024 U CN202021116024 U CN 202021116024U CN 212671695 U CN212671695 U CN 212671695U
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Abstract
The utility model relates to a recoverable plug that oil drilling top layer well cementation was used. The problem that the material waste is wasted time and energy is mainly solved by drilling and removing the rubber plug when the rubber plug is adopted for fixing the surface layer. The method is characterized in that: the middle sleeve (2) is arranged outside the middle-lower position of the upward lifting joint (1) and forms a sealing surface with an inner hole of the middle sleeve (2); the middle of the sealing surface of the upper lifting joint (1) is provided with a plurality of radial holes, and the lower end of the upper lifting joint (1) is connected with a threaded ring (4) through threads; the outer part of the middle sleeve (2) is connected with a rubber plug body (3); an upper retainer ring (5) and a lower retainer ring (7) are arranged on the middle sleeve (2) at the upper end and the lower end of the rubber plug body (3). The recyclable rubber plug for surface well cementation of petroleum drilling can be reused, waste is reduced, and work efficiency is improved.
Description
Technical Field
The utility model relates to an oil field oil drilling technical field, in particular to recoverable plug that oil drilling top layer well cementation was used.
Background
The large-size surface casing well cementation of an oil field usually adopts two modes, namely an inner pipe well cementation method and a traditional method using a collision pressure rubber plug. The first mode has the problem that a cement plug needs to be drilled, so that slurry channeling is easy to occur during well cementation, and the problem that the quality of well cementation is poor due to over replacement, less replacement and the like is easy to occur because of poor control during replacement; the second mode is not much used because of the problems of drilling rubber plugs and the like.
The traditional liquid epoxy anticorrosive coating and the fused epoxy powder anticorrosive coating which are commonly adopted at present have the defects of thin thickness, low mechanical strength of the coating, coating defects and poor adhesion of polyolefin in direct contact with a pipe.
In recent years, international oil prices are continuously in low loitering, and most domestic oil and gas field enterprises face greater operating pressure. The waste oil pipe is repaired and reused to become an important measure for realizing upgrading and efficiency enhancement of the oil field and realizing a low-cost development strategy.
The oil pipe is used as a main channel for oil and gas production, and is subjected to various external force damages in an oil well besides the corrosion of various corrosive media in crude oil. Generally, after a period of production, the oil pipe passage is easily waxed and scaled to cause the blockage of the main passage, and the rod pipe is eccentrically worn to cause the leakage of the oil pipe, thereby affecting the normal production of the oil well. The research on the existing common waste oil pipe repairing technology comprises three types: (1) simple repair (replacement of coupling, re-machining of threads, short section machining, etc.); (2) remanufacturing (hot rolling repair, self-propagating high-temperature synthesis, etc.); (3) and (4) making a ground pipeline (directly used after cleaning, used after repairing the lining, and the like). And aiming at the third type of old oil pipes, screening according to the critical wall thickness of the ground pipeline, thermally coating the inner lining high-molecular polyethylene composite anticorrosive protective layer, and performing field application again after repairing to save the cost of the oil field pipes.
Disclosure of Invention
The utility model aims to solve the technical problem that the existing material that must bore and remove the rubber plug wastes time and energy when adopting rubber plug well cementation top layer in the prior art is overcome, and provide a recoverable rubber plug that oil drilling top layer well cementation was used, this recoverable rubber plug that oil drilling top layer well cementation was used, the rubber plug can also used repeatedly, reduces extravagantly, improves the work efficiency.
The utility model provides a its problem accessible reach as follows technical scheme: the recoverable rubber plug for surface well cementation of petroleum drilling comprises an upper lifting joint, a middle sleeve and a rubber plug body, wherein the middle sleeve is arranged outside a sealing surface at the middle-lower position of the upper lifting joint and forms a sealing surface with an inner hole of the middle sleeve; the middle of the sealing surface of the upper lifting joint is provided with a plurality of radial holes, and the lower end of the upper lifting joint is connected with a screw thread ring through threads; the outer part of the middle sleeve is connected with a rubber plug body; the middle sleeve at the upper end and the lower end of the rubber plug body is provided with an upper retainer ring and a lower retainer ring.
The upper end of the upward lifting joint is provided with a drill rod female buckle for connecting a drill rod, the middle of an inner hole is provided with a plug, and the outer diameter of the middle-lower position is smaller than that of the upper end.
The outer surface of the middle sleeve is provided with a groove and a step which are vulcanized with the rubber plug body, and the inner hole of the middle sleeve is provided with a step-shaped large-diameter cylindrical surface and a small-diameter sealing surface which correspond to the lifting joint.
The lower screw thread ring is arranged in the space between the lower cylindrical surface of the middle sleeve and the lower end of the upper lifting joint.
In order to prevent the upper lifting joint from being buckled along with the rotation of the male joint, the lower part of the upper lifting joint is provided with saw-tooth teeth for preventing rotation.
The upper end female buckle of the lifting joint is designed into a split structure of the fishing joint and the butt joint rod; the fishing joint can be sleeved outside the butt joint rod; the outer diameter of the upper end of the cylindrical butt joint rod is provided with a boss, the upper part of the fishing joint is a drill rod female buckle, and the lower part of the fishing joint is provided with a slide way matched with the boss outside the butt joint rod.
The working principle of the invention is as follows: the inner part of the rubber plug is designed with a channel which can be closed and opened, and the purpose of opening the channel and lifting the whole rubber plug out of the well bottom is achieved by utilizing the lifting of the lifting joint. The recoverable rubber plug can realize normal surface well cementation, and can be lifted out of the well bottom after the well cementation is finished, thereby avoiding the trouble of drilling the rubber plug by a drill bit.
Compared with the above background art, the utility model can have following beneficial effect: when cementing, the recoverable rubber plug plays the same role as the traditional cementing rubber plug. After the well cementation is finished, a drill rod is used for drilling, a male buckle of the drill rod which is drilled downwards is in butt joint with a female buckle of the lifting connector, the lifting connector is lifted after butt joint is finished, the lifting connector is moved upwards to enable the upper part and the lower part which are sealed by the rubber plug to be communicated through an annular space between the middle sleeve and the lifting connector and an opened radial hole, when the lifting connector is continuously lifted, the middle sleeve and the middle sleeve are driven by the screw thread ring of the lower part to drive the rubber plug body to overcome resistance force to move upwards, and liquid on the upper part of the rubber plug can flow to the lower part. Thus, the rubber plug can be lifted out of the well, thereby avoiding the slower procedure of drilling and removing the rubber plug, saving the time of drilling the well and improving the working efficiency. The upper end female buckle of the upper lifting joint can also be designed into a split structure of the fishing joint and the butt joint rod; the fishing joint can be sleeved outside the butt joint rod; the outer diameter of the upper end of the cylindrical butt joint rod is provided with a boss, the upper part of the fishing joint is a drill rod female buckle, and the lower part of the fishing joint is provided with a slide way matched with the boss outside the butt joint rod. When the well is fixed, the fishing rod, the middle sleeve and the rubber plug body are integrated into a whole to be put into the well, after the well is fixed, the fishing joint is connected to the male buckle end of the drill rod to be drilled, so that the fishing joint to be drilled is directly butted with the butt-joint rod, and the butt-joint rod is lifted up after the butt-joint, thereby the rubber plug can be lifted out of the well.
Drawings
FIG. 1 is a half-sectional view of the utility model during the well cementing operation;
FIG. 2 is a half sectional view of the utility model when lifting up;
FIG. 3 is a schematic view of a half-section structure of the lifting joint of the utility model;
FIG. 4 is a half-sectional view of the butt rod and the recyclable rubber plug during the well cementing operation when the female buckle of the upward lifting joint of the present invention is designed into a split structure;
fig. 5 is a schematic diagram of a half-section structure of the fishing joint of the present invention.
In the figure: the anti-rotation connector comprises a lifting connector body 1, a middle sleeve 2, a rubber plug body 3, a screw thread ring 4, an upper retainer ring 5, an O-shaped sealing ring 6, a lower retainer ring 7, anti-rotation sawtooth teeth 8, a butt joint rod 9, a fishing connector 10, a boss 11 and a slideway 12.
The specific implementation mode is as follows:
the invention will be further explained with reference to the drawings:
as shown in the attached figure 1, the recoverable rubber plug for oil drilling surface well cementation comprises an upper lifting joint 1, a middle sleeve 2 and a rubber plug body 3, wherein the upper end of the upper lifting joint 1 is a bell-mouth-shaped drill rod female buckle connected with a drill rod, a plug is arranged in the middle of an inner hole, the outer diameter of the middle lower part is smaller than that of the upper end, the upper lifting joint and the inner hole of the middle sleeve 2 form sealing, the middle of a sealing surface of the upper lifting joint 1 is provided with a plurality of radial holes, and the lower end of the upper lifting joint 1 is connected with a screw thread ring; the outer surface of the middle sleeve 2 is provided with a groove and a step which are vulcanized with the rubber plug body 3, the inner hole of the middle sleeve 2 is provided with a step-shaped large-diameter cylindrical surface and a small-diameter sealing surface which correspond to the lifting joint 1, and a lower screw thread ring 4 is arranged in the space between the lower cylindrical surface of the middle sleeve 2 and the lower end of the lifting joint 1, so that the lower screw thread ring 4 of the lifting joint 1 has a larger space which can move up and down. An O-shaped sealing ring 6 is arranged between the upper lifting joint 1 and the middle sleeve 2, the optimal position of the O-shaped sealing ring 6 is arranged at the upper side and the lower side of a radial hole of the upper lifting joint, and an upper retaining ring 5 and a lower retaining ring 7 are arranged on the middle sleeve 2 at the upper end and the lower end of the rubber plug body 3 for convenience of processing; as shown in fig. 3, the lower part of the upward-lifting joint 1 is provided with anti-rotation serrated teeth 8 for preventing the upward-lifting joint from being locked along with the rotation of the male joint when the upward-lifting joint is locked.
As shown in fig. 4 and 5, the upper female buckle of the upper lifting joint 1 is designed into a split structure of a fishing joint 10 and a butt joint rod 9, so that the outer diameter of the upper lifting joint is reduced; the fishing joint 10 can be sleeved outside the butt joint rod 9; a boss 11 is arranged on the outer diameter of the upper end of the cylindrical butt joint rod 9, a drill rod female buckle is arranged at the upper part of the fishing joint 10, and a slide way 12 matched with the boss outside the butt joint rod 9 is arranged at the lower part of the fishing joint; the slideway can be automatically hung with a lug boss on the outer diameter of the butt joint rod 9. As long as salvage joint 10 contacts with butt joint rod 9, the boss on the external diameter of butt joint rod 9 upper end gets into the slide, until salvage joint transfer to no longer move, at this moment under the guide effect of slide for butt joint rod 9's boss directly falls on the promotion groove of slide. The butt rod can be lifted up and moved upwards as long as the fishing joint 10 is lifted up. Therefore, the work of lifting the rubber plug from the underground is completed, the working efficiency is improved, the process of rotating and buckling during butt joint is reduced, only the butt joint rod 9, the middle sleeve 2 and the rubber plug body 3 are lifted into the well during well cementation, and the outer diameter of the lifting joint is also reduced.
Example 1
When the recoverable rubber plug for surface well cementation of petroleum drilling is lifted upwards, as shown in figure 2, after the well cementation is finished, a drill rod is used for drilling downwards, a male buckle of the drill rod for drilling downwards is butted with a female buckle of the lifting joint 1, the drill rod is lifted upwards after the butt joint is finished, the rubber plug body 3 is in interference fit with an inner hole of a surface casing pipe, the friction resistance is large, the drill rod is kept still firstly, the upper joint 1 moves between sealing surfaces of the upper joint 1 and the middle sleeve 2, the lifting joint 1 moves upwards, the upper part and the lower part which are sealed by the rubber plug are communicated through an annular space between the middle sleeve 2 and the lifting joint 1 and an opened radial hole, when the lifting joint 1 continues to lift upwards, the middle sleeve 2 and the middle sleeve 2 are driven by the lower screw thread ring 4, the rubber plug body 3 is driven by the middle sleeve 2 to overcome. Thus, the rubber plug can be lifted out of the well, thereby avoiding the slower procedure of drilling and removing the rubber plug, saving the time of drilling the well and improving the working efficiency.
Example 2
As shown in fig. 4 and 5, a fishing joint is connected to the male buckle end of a drilling rod to be drilled, the drilling is continued until the fishing joint touches a butt joint rod, a boss on the outer diameter of the butt joint rod automatically slides into a slideway of the fishing joint along the slideway of the fishing joint, the butt joint rod is firmly hung as long as the butt joint rod is lowered to the bottom and then lifted, the butt joint rod can move upwards as long as the butt joint rod is lifted continuously, so that the upper part and the lower part which are sealed by a rubber plug are communicated through an annular space between a middle sleeve and the lifting joint and an opened radial hole, and when the butt joint rod is lifted continuously, the middle sleeve and the middle sleeve are driven by a lower screw ring to drive a rubber plug body to overcome resistance and move upwards, and liquid on the. This allows the plug to be lifted downhole.
Claims (9)
1. The utility model provides a recoverable plug that oil drilling surface well cementation was used, includes and lifts joint (1), middle cover (2), plug body (3), its characterized in that: the middle sleeve (2) is arranged outside the middle-lower position of the upward lifting joint (1) and forms a sealing surface with an inner hole of the middle sleeve (2); the middle of the sealing surface of the upper lifting joint (1) is provided with a plurality of radial holes, and the lower end of the upper lifting joint (1) is connected with a threaded ring (4) through threads; the outer part of the middle sleeve (2) is connected with a rubber plug body (3); an upper retainer ring (5) and a lower retainer ring (7) are arranged on the middle sleeve (2) at the upper end and the lower end of the rubber plug body (3).
2. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: the upper end of the upward lifting joint (1) is provided with a drill rod female buckle for connecting a drill rod, the middle of an inner hole is provided with a plug, and the outer diameter of the middle-lower position is smaller than that of the upper end.
3. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: the outer surface of the middle sleeve (2) is provided with a groove and a step for vulcanizing the rubber plug body (3), and the inner hole of the middle sleeve (2) is provided with a step-shaped large-diameter cylindrical surface and a small-diameter sealing surface corresponding to the lifting joint (1).
4. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: the screw thread ring (4) is arranged in the space between the lower cylindrical surface of the middle sleeve (2) and the lower end of the upper lifting joint (1).
5. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: an O-shaped sealing ring (6) is arranged between the upward lifting joint (1) and the middle sleeve (2).
6. The recyclable rubber plug for oil well surface cementing according to claim 5, wherein: the optimal positions of the O-shaped sealing rings (6) are arranged at the upper side and the lower side of the radial hole of the upward lifting joint.
7. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: the lower part of the upward lifting joint (1) is provided with anti-rotation sawtooth teeth (8).
8. The recyclable rubber plug for oil well surface cementing according to claim 1, wherein: the upper end female buckle of the lifting connector (1) is designed into a split structure of the fishing connector (10) and the butt joint rod (9).
9. The recyclable rubber plug for oil well surface cementing according to claim 8, wherein: the fishing joint (10) can be sleeved outside the butt joint rod (9); a boss is arranged on the outer diameter of the upper end of the butt joint rod (9), a drill rod female buckle is arranged on the upper portion of the fishing joint (10), and a slide way matched with the boss outside the butt joint rod (9) is arranged on the lower portion of the fishing joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021116024.0U CN212671695U (en) | 2020-06-16 | 2020-06-16 | Recoverable rubber plug for surface cementing of petroleum drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021116024.0U CN212671695U (en) | 2020-06-16 | 2020-06-16 | Recoverable rubber plug for surface cementing of petroleum drilling |
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| Publication Number | Publication Date |
|---|---|
| CN212671695U true CN212671695U (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021116024.0U Active CN212671695U (en) | 2020-06-16 | 2020-06-16 | Recoverable rubber plug for surface cementing of petroleum drilling |
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| CN (1) | CN212671695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309487A (en) * | 2021-05-24 | 2021-08-27 | 中煤科工集团西安研究院有限公司 | Recoverable fixed-point grouting device and method for directional long drilling hole in underground coal mine |
-
2020
- 2020-06-16 CN CN202021116024.0U patent/CN212671695U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309487A (en) * | 2021-05-24 | 2021-08-27 | 中煤科工集团西安研究院有限公司 | Recoverable fixed-point grouting device and method for directional long drilling hole in underground coal mine |
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