CN109184582B - Split polish rod, polish rod replaceable assembly and polish rod replacement process - Google Patents
Split polish rod, polish rod replaceable assembly and polish rod replacement process Download PDFInfo
- Publication number
- CN109184582B CN109184582B CN201811082341.2A CN201811082341A CN109184582B CN 109184582 B CN109184582 B CN 109184582B CN 201811082341 A CN201811082341 A CN 201811082341A CN 109184582 B CN109184582 B CN 109184582B
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- polish rod
- diameter
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- rod
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to the technical field of wellhead polished rods, in particular to a split polished rod, a polished rod replaceable assembly and a polished rod replacement process; the split polish rod comprises a main polish rod, a polish rod nipple and a blowout prevention plunger which are sequentially connected together from top to bottom, wherein the main polish rod comprises a main rod diameter-expanding section and a main rod diameter-reducing section which are coaxially distributed, the main rod diameter-expanding sections are distributed at intervals along the vertical direction, and a main rod diameter-reducing section is connected between every two adjacent main rod diameter-expanding sections; the polish rod replaceable assembly comprises a split polish rod and a replaceable polish rod blowout prevention box; and in the polish rod replacement process, in the first step, the split polish rod is lifted up until the top end of the polish rod nipple is positioned above the upper packing sealing body, and at least one nipple diameter-reducing section is positioned above the upper packing sealing body. The invention can record and compare the lower position of the split polish rod through the main rod diameter reducing section, and can conveniently identify the lifting position of the blowout prevention plunger when the main polish rod is replaced through the short joint diameter reducing section, thereby being convenient for the replacement operation of the main polish rod.
Description
Technical Field
The invention relates to the technical field of wellhead polished rods, in particular to a split polished rod, a polished rod replaceable assembly and a polished rod replacement process.
Background
The existing polish rod is inconvenient to replace, and when the polish rod is lifted, the position of the lower end of the polish rod cannot be accurately judged, so that the sucker rod coupling is frequently caused to collide with the packing box, and the damage of the pole column is aggravated. Moreover, the existing polish rod hanging limiting device often needs to be provided with a clamp on the smooth surface of the polish rod, the clamp and the rope hanger are matched to transfer the force of the pumping unit, the clamp-beating operation is complex, time and labor are wasted, tooth marks can be left on the surface of the polish rod, and the service life of the polish rod is shortened.
Disclosure of Invention
The invention provides a split polish rod, a polish rod replaceable assembly and a polish rod replacing process, which overcome the defects of the prior art, can effectively solve the problems that the replacement of the existing polish rod is inconvenient, the position of the lower end of the polish rod cannot be accurately judged during lifting, a sucker rod coupling is easy to collide with a packing box, the damage of a pole column is aggravated, the polish rod hanging limit is further solved, a smooth surface is required to be checked, the operation is complicated, an indentation is left, and the service life of the polish rod is shortened.
One of the technical schemes of the invention is realized by the following measures: the split type polish rod comprises a main polish rod, a polish rod nipple and blowout prevention plungers, wherein the main polish rod, the polish rod nipple and the blowout prevention plungers are sequentially connected from top to bottom, the main polish rod comprises a main rod diameter-expanding section and a main rod diameter-reducing section which are coaxially distributed, the main rod diameter-expanding sections are distributed at intervals along the vertical direction, the main rod diameter-reducing sections are connected between every two adjacent main rod diameter-expanding sections, the number of the main rod diameter-reducing sections is at least one, at least one main rod diameter-reducing section is arranged at the upper part of the main polish rod, the polish rod nipple comprises a nipple diameter-expanding section and a nipple diameter-reducing section which are coaxially distributed, the nipple diameter-expanding sections are fixedly arranged at the lower parts of the bottom, and the nipple diameter-expanding sections which can form a blowout prevention sealing assembly with the blowout prevention pump; the diameters of all the main rod diameter-expanding sections and the short joint diameter-expanding sections are equal, the diameter of the main rod diameter-reducing section or the diameter of the external circle is smaller than that of the main rod diameter-expanding section, and the diameter of the short joint diameter-reducing section or the diameter of the external circle is smaller than that of the short joint diameter-expanding section.
The following are further optimizations and/or improvements to the above-described inventive solution:
the section of the main rod diameter-reducing section can be cylindrical or regular polygon, and the section of the short section diameter-reducing section is cylindrical or regular polygon.
The outer side of the upper part of the blowout prevention plunger can be provided with a plunger outer ring platform, the blowout prevention sealing assembly comprises an upper supporting ring, a middle supporting ring, a lower supporting ring, a sealing inner ring and a sealing ring, the outer side of the blowout prevention plunger corresponding to the lower position of the plunger outer ring platform is sequentially sleeved with the upper supporting ring, the sealing inner ring, the middle supporting ring, the sealing inner ring and the lower supporting ring from top to bottom, the blowout prevention plunger is fixedly provided with an upper end of the blowout prevention plunger, the blowout prevention fastener is propped against the lower supporting ring, the top of the upper supporting ring is propped against the bottom of the plunger outer ring platform, and the outer side of each sealing inner ring is provided with the sealing ring.
The outer ring platform of the short section arranged at the bottom can be arranged at the outer side of the lower part of the short section reducing section arranged at the bottom, the outer side of the lower part of the short section reducing section arranged at the bottom and the inner side of the upper part of the blowout prevention plunger are fixedly installed together through threaded connection, an anti-drop gasket is arranged between the outer ring platform and the inner side of the upper part of the short section reducing section arranged at the bottom, and the lower end of the main rod expanding section arranged at the bottom and the short section expanding section arranged at the top are fixedly installed together through threaded connection, and an anti-drop gasket is arranged between the outer ring platform and the inner side of the short section expanding section arranged at the top.
The second technical scheme of the invention is realized by the following measures: the utility model provides an use removable assembly of polished rod of split type polished rod, prevents spouting the box including split type polished rod and removable polished rod, removable polished rod prevents spouting the box including injecting glue casing, seal the glue subassembly, the injecting glue subassembly, go up the packing seal, lower packing seal and prevent spouting pump cylinder, split type polished rod outside has distributed in proper order by last packing seal, the injecting glue casing, lower packing seal and prevent spouting pump cylinder down, the upper portion fixed mounting of injecting glue casing has last packing seal, the lower part fixed mounting of injecting glue casing has lower packing seal, go up packing seal and lower packing seal and the outside of polished rod form sealedly, at least one nipple joint reducing section is located the top of last packing seal, the lower part fixed mounting of lower packing seal has the prevent spouting pump cylinder, the prevent spouting plunger is located the prevent spouting pump cylinder and both through preventing spouting seal assembly sealedly install together, the external diameter of mobile jib section and expanding section all is less than the internal diameter of prevent spouting pump cylinder, the middle part of injecting glue casing is equipped with the cover and has the packing seal and go up the sealing up the seal and seal the seal is equipped with the seal and seal the seal between the seal of the seal mouth side seal mouth is equipped with the seal mouth between the seal mouth side seal mouth and the seal mouth is located the seal mouth outside the seal mouth is sealed the side seal mouth is sealed at the side seal mouth is sealed off between the side seal mouth is sealed the side can be opened to the end seal mouth is filled with the seal mouth is filled with glue seal mouth to seal mouth side.
The following is a further optimization and/or improvement of the second technical scheme of the invention:
the upper packing sealing body can comprise an upper packing shell, an upper pressing block, an upper tower packing, an upper backing ring, a spring and packing compacting pieces, wherein the middle part of the upper packing shell is provided with an upper sealing channel which is sleeved on the outer side of the polish rod nipple and penetrates up and down, the upper inner side of the upper sealing channel corresponding to the outer side of the polish rod nipple is sequentially provided with the upper pressing block, the upper tower packing and the upper backing ring from top to bottom, the upper inner side of the upper pressing block is provided with an inner annular groove, the inner annular groove is internally provided with a spring sleeved on the outer side of the polish rod nipple, the packing compacting pieces propping against the upper end face of the spring are arranged on the outer side of the upper portion of the upper packing shell, and the lower outer side of the upper packing shell and the upper inner side of the glue injection shell are fixedly installed together.
The lower packing sealing body can comprise a lower packing shell, a lower pressing block, a lower tower packing and a lower backing ring, wherein the middle part of the lower packing shell is provided with a lower sealing channel which is sleeved on the outer side of the polish rod nipple and penetrates up and down, the inner side of the lower part of the lower sealing channel is provided with a spacing ring table which is sleeved on the outer side of the polish rod nipple, the outer side of the lower part of the glue injection shell and the inner side of the upper part of the lower sealing channel are fixedly arranged together, a lower pressing block, a lower tower packing and a lower backing ring are sequentially distributed between the lower sealing channel corresponding to the position between the glue injection shell and the spacing ring table and the polish rod nipple from top to bottom, the bottom surface of the glue injection shell is propped against the top surface of the lower pressing block, and the lower backing ring is arranged on the spacing ring table, and a blowout preventing pump cylinder is fixedly arranged in the lower sealing channel corresponding to the position below the spacing ring table.
The lower packing shell corresponding to the lower tower type packing position can be provided with a bleed hole which can be communicated with the lower sealing channel, and the bleed hole is provided with a bleed valve assembly.
The lower outer side of the glue injection shell is fixedly installed with the upper inner side of the lower sealing channel through threaded connection, the lower outer side of the glue injection shell is fixedly provided with an anti-loosening back cap through threaded connection, the lower end of the anti-loosening back cap is abutted against the upper end face of the lower packing shell, and the lower sealing channel is fixedly installed with the anti-spraying pump cylinder through threaded connection.
The sealing assembly can comprise a C-ring pressing cap and a scraping ring which are both positioned on the outer side of the polish rod nipple; an upper mounting ring table sleeved on the outer side of the polish rod nipple is arranged in the glue injection channel corresponding to the position above the glue injection sealing cavity, a C ring pressing cap is arranged in the glue injection channel above the upper mounting ring table in a limiting manner, and at least one glue scraping ring is arranged in the glue injection channel at the position between the C ring pressing cap and the upper mounting ring table; a lower mounting ring table is arranged in the glue injection channel corresponding to the position below the glue injection sealing cavity, a C-ring pressing cap is arranged in the glue injection channel below the lower mounting ring table in a limiting manner, and at least one glue scraping ring is arranged in the glue injection channel between the lower mounting ring table and the C-ring pressing cap.
The glue injection assembly can comprise a glue injection nozzle and a bolt switch, wherein the glue injection nozzle is arranged on the outlet of the glue injection side, a glue injection through hole is formed in the middle of the glue injection nozzle, and the bolt switch capable of plugging and opening the glue injection through hole is arranged on the glue injection nozzle.
The third technical scheme of the invention is realized by the following measures: a polish rod replacement process of a polish rod replaceable assembly comprises the following steps:
the method comprises the steps that a split polish rod is lifted to the top end of a short section of the polish rod to be located above an upper packing sealing body, at least one short section diameter-reducing section is located above the upper packing sealing body, a blowout prevention plunger is located in a blowout prevention pump barrel, and the two sections are sealed through a blowout prevention sealing assembly;
secondly, installing a limiting device on the outer side of the shrinkage section of the short section near the upper end surface of the upper packing sealing body, and enabling the limiting device to be arranged on the upper packing sealing body by adjusting the position of the split polish rod;
step three, the main polish rod is disassembled, and the main polish rod to be replaced is arranged above the polish rod nipple;
and fourthly, the split polish rod is lowered to the bottom of the wellhead connecting pipe string, at least one main rod diameter-reducing section is positioned above the upper packing sealing body, and the number of the main rod diameter-reducing sections positioned above the upper packing sealing body is recorded.
The invention has reasonable and compact structure, can form good seal for the split polish rod by injecting high-temperature resistant sealant into the glue injection sealing cavity and matching with the upper packing sealing body and the lower packing sealing body, can realize the pressure holding down of the underground through the seal formed by the blowout prevention plunger and the blowout prevention sealing assembly and the blowout prevention pump cylinder when the invention is used for the replacement operation of the main polish rod, reduces the potential safety hazard, ensures that the embodiment does not need to be dismantled and additional well killing operation is convenient for the replacement of the split polish rod, and has the characteristics of simple operation and high working efficiency; the setting of reducing section through the mobile jib can realize the record and the comparison of split type polished rod below position, can be convenient for discern the lift position of blowout prevention plunger when main polished rod is changed through the setting of nipple joint reducing section to the change operation of main polished rod of being convenient for, the setting of mobile jib reducing section and nipple joint reducing section can be convenient for with the installation of current well-known stop device (such as rope hanger etc.), thereby realizes the spacing or lift of hanging down the operation of split type polished rod, and can not harm split type polished rod's outer wall.
Drawings
Fig. 1 is a schematic diagram of a front cross-sectional structure of a second embodiment of the present invention.
Fig. 2 is a schematic view of the partial enlarged structure at a of fig. 1.
The codes in the drawings are respectively: 1 is a glue injection shell, 2 is a glue injection sealing cavity, 4 is a main rod expanding section, 5 is a short-joint expanding section, 6 is a glue injection plunger, 7 is a sealing ring, 8 is an upper packing shell, 9 is an upper pressing block, 10 is an upper tower packing, 11 is an upper backing ring, 12 is a spring, 13 is a packing pressing piece, 14 is a short-joint outer ring table, 15 is a lower packing shell, 16 is a lower pressing block, 17 is a lower tower packing, 18 is a lower backing ring, 19 is a limiting ring table, 20 is a back-stop cap, 21 is a C ring pressing cap, 22 is a glue scraping ring, 23 is an upper mounting ring table, 24 is a lower mounting ring table, 25 is a glue injection nozzle, 26 is a bolt switch, 27 is a gas valve assembly, 28 is a main rod reducing section, 29 is a short-joint reducing section, 30 is a anti-drop gasket, 31 is a plunger table, 32 is an upper supporting ring, 33 is a middle supporting ring, 34 is a lower supporting ring, 35 is a sealing inner ring, and 36 is a glue injection preventing fastener.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention is further described below with reference to examples and figures:
embodiment one: as shown in fig. 1 and 2, the split polish rod comprises a main polish rod, polish rod nipple segments and blowout preventer plungers 6 which are sequentially connected from top to bottom, wherein the main polish rod comprises a main rod expanded diameter section 4 and a main rod contracted diameter section 28 which are coaxially distributed, the main rod expanded diameter sections 4 are distributed at intervals along the vertical direction, each two adjacent main rod expanded diameter sections 4 are connected with the main rod contracted diameter section 28, the number of the main rod contracted diameter sections 28 is at least one, at least one main rod contracted diameter section 28 is positioned at the upper part of the main polish rod, the polish rod nipple segments comprise nipple expansion sections 5 and nipple expansion section 29 which are coaxially distributed, the nipple expansion sections 5 are distributed at intervals along the vertical direction, each two adjacent nipple expansion sections 5 are connected with nipple expansion sections 29, the number of the nipple expansion sections 29 is at least one, at least one nipple expansion section 29 is positioned at the upper part of the polish rod, the lower end of the main rod expanded diameter section 4 positioned at the bottom is fixedly mounted with the expansion section 5 positioned at the top, the lower end of the nipple section 5 positioned at the bottom is fixedly mounted with the blowout preventer plungers 6, and the blowout preventer plungers 6 can be fixedly mounted on the lower part of the nipple segments 6; the diameters of all the main rod expanding sections 4 and the short joint expanding sections 5 are equal, the diameter of the main rod reducing section 28 or the diameter of the circumcircle is smaller than that of the main rod expanding sections 4, and the diameter of the short joint reducing section 29 or the diameter of the circumcircle is smaller than that of the short joint expanding sections 5. In the conventional lifting and lowering operation of the present embodiment, the present embodiment may be lowered until the blowout preventer plunger 6 is located below the blowout preventer cylinder 2, and the main polish rod is the main operation rod at this time, and the replacement operation of the present embodiment refers to the replacement operation of the main polish rod. The embodiment has reasonable and compact structure, the recording and comparison of the lower position of the embodiment can be realized through the arrangement of the main rod reducing section 28, the lifting position of the blowout prevention plunger 6 can be conveniently identified when the main polish rod is replaced through the arrangement of the short-joint reducing section 29, so that the replacement operation of the main polish rod is convenient, the arrangement of the main rod reducing section 28 and the short-joint reducing section 29 can be convenient for the installation of the prior known limiting device (such as a rope hanger and the like), and the hanging limiting or lifting and lowering operation of the embodiment can be realized without damaging the outer wall of the embodiment. The main rod expanding section 4 and the main rod reducing section 28 can be integrally arranged according to the requirements; the short section expanding section 5 and the short section reducing section 29 can be integrally arranged; therefore, the main polish rod and the polish rod pup joint can maintain good strength.
The split polish rod can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the main rod reducing section 28 has a cylindrical or regular polygon cross section, and the short joint reducing section 29 has a cylindrical or regular polygon cross section. Therefore, the device is convenient for installing a limiting device (such as a rope hanger and the like), the main rod reducing section 28 and/or the short section reducing section 29 are/is regular polygon, torque transmission can be facilitated, and fastening and installation of a user are facilitated. The regular polygon may be a square or a regular hexagonal shape or other existing known shapes according to requirements.
As shown in fig. 1 and 2, a plunger outer ring table 31 is arranged on the outer side of the upper portion of the blowout prevention plunger 6, the blowout prevention sealing assembly comprises an upper supporting ring 32, a middle supporting ring 33, a lower supporting ring 34, a sealing inner ring 35 and a sealing ring 7, the outer side of the blowout prevention plunger 6 corresponding to the lower position of the plunger outer ring table 31 is sequentially sleeved with the upper supporting ring 32, the sealing inner ring 35, the middle supporting ring 33, the sealing inner ring 35 and the lower supporting ring 34 from top to bottom, an upper end of the blowout prevention plunger 6 is fixedly provided with a blowout prevention fastener 36 propping against the lower supporting ring 34, the top of the upper supporting ring 32 is propped against the bottom of the plunger outer ring table 31, and the outer side of each sealing inner ring 35 is provided with the sealing ring 7. The sealing between the blowout preventer plunger 6 and the blowout preventer cylinder 2 can thus be achieved by means of the sealing ring 7. According to the requirements, an outer arc chamfer is arranged between the lower end of the plunger outer ring table 31 and the outer side of the blowout prevention plunger 6, an inner arc chamfer matched with the outer arc chamfer is arranged on the inner side of the upper part of the upper supporting ring 32, and the inner arc chamfer and the outer arc chamfer are attached together; the sealing ring 7 can be an annular sealing sleeve, the upper end and the lower end of the annular sealing sleeve can be respectively provided with an outer ring chamfer, and the outer sides of the lower end of the upper supporting ring 32, the outer sides of the upper end and the outer sides of the lower end of the middle supporting ring 33 and the outer sides of the upper end of the lower supporting ring 34 corresponding to the chamfer positions of the outer rings can be respectively provided with a limiting ring table 19 which can be pressed on the outer sides of the annular sealing sleeve, so that the sealing performance between the blowout preventer plunger 6 and the blowout preventer pump cylinder 2 can be enhanced; the blowout prevention fastener 36 may be a double back cap, both of which are fixedly mounted with the blowout prevention plunger 6 by a threaded connection.
As shown in fig. 1, the outer side of the lower part of the short-joint diameter-reducing section 29 at the bottom is provided with a short-joint outer ring table 14, the outer side of the lower part of the short-joint diameter-reducing section 29 at the bottom and the inner side of the upper part of the blowout-preventing plunger 6 are fixedly installed together through threaded connection, an anti-drop gasket 30 is arranged between the two, and the lower end of the main rod diameter-expanding section 4 at the bottom and the short-joint diameter-expanding section 5 at the top are fixedly installed together through threaded connection, and the anti-drop gasket 30 is arranged between the two. Therefore, the disassembly, assembly and replacement of the main polish rod and the polish rod pup joint can be facilitated, the anti-drop gasket 30 can also prevent the main polish rod and the polish rod pup joint from loosening, and the stability of the fastening connection of the main polish rod and the polish rod pup joint is ensured. According to the requirement, the outer side of the lower part of the blowout prevention plunger 6 is provided with external threads, so that the connection between the embodiment and the lower pipe string can be facilitated.
Embodiment two: as shown in figure 1, the polish rod replaceable assembly of the split polish rod according to the first embodiment comprises a split polish rod and a replaceable polish rod blowout prevention box, wherein the replaceable polish rod blowout prevention box comprises a glue injection shell 1, a glue sealing assembly, a glue injection assembly, an upper packing seal body, a lower packing seal body and a blowout prevention pump cylinder 2, the upper packing seal body, the glue injection shell 1, the lower packing seal body and the blowout prevention pump cylinder 2 are sequentially distributed on the outer side of the split polish rod from top to bottom, the upper packing seal body is fixedly arranged on the upper part of the glue injection shell 1, the lower packing seal body is fixedly arranged on the lower part of the glue injection shell 1, the upper packing seal body and the lower packing seal body form a seal with the outer side of the polish rod, at least one short reducing section 29 is positioned above the upper packing seal body, the blowout prevention pump cylinder 2 is fixedly arranged on the lower part of the lower packing seal body, the blowout prevention plunger 6 is located in the blowout prevention pump cylinder 2, the two blowout prevention pump cylinders are installed together through the blowout prevention sealing assembly in a sealing mode, the outer diameters of the main rod expanding section 4 and the short section expanding section 5 are smaller than the inner diameter of the blowout prevention pump cylinder 2, a glue injection channel which is sleeved outside the polish rod short section and penetrates up and down is arranged in the middle of the glue injection shell 1, glue sealing components which are located outside the polish rod short section and can prevent leakage of sealing glue are arranged on the inner side of the upper portion and the inner side of the lower portion of the glue injection channel, a glue injection sealing cavity 3 is formed between the polish rod short section and the glue injection channel, at least one glue injection side outlet which is communicated with the glue injection sealing cavity 3 is distributed on the glue injection shell 1 along the circumference, glue injection components which can be opened and closed are installed in each glue injection side outlet, and the glue injection side outlet can be opened when the glue injection components are opened and the glue injection side outlet can be closed. When the anti-blowout pump is used, in the conventional lifting and lowering operation of the split polish rod, the split polish rod can be firstly lowered to the position, below the anti-blowout plunger 6, of the anti-blowout pump cylinder 2, and the main polish rod is the main operation rod of the embodiment, so that the embodiment can be used for replacing the main polish rod; because the outer diameters of the main rod expanding section 4 and the short section expanding section 5 are smaller than the inner diameter of the blowout prevention pump barrel 2, and the blowout prevention plunger 6 is continuously positioned below the blowout prevention pump barrel 2 in the conventional lifting and lowering operation of the split polish rod, the lifting and lowering operation of the main polish rod and the polish rod short section can not generate friction with the blowout prevention pump barrel 2, and the abrasion of the main polish rod and the polish rod short section by the blowout prevention pump barrel 2 can be avoided; the arrangement of the main rod reducing section 28 and the short joint reducing section 29 can facilitate the installation of the prior known limiting devices (such as a rope hanger and the like), thereby realizing the hanging limiting or lifting and lowering operation of the split polish rod without damaging the outer wall of the split polish rod; when the pump is in well completion, the split polish rod is lowered to the bottom, at least one main rod diameter reduction section 28 is positioned above the upper packing sealing body, and a user can record the lowering position of the split polish rod through the number of the main rod diameter reduction sections 28 exposed at the upper part of the main polish rod, so that whether the split polish rod is lowered to the bottom or not can be judged through the number of the main rod diameter reduction sections 28 exposed, and the lowering positions of the split polish rods at each time can be compared; in the use process, the sealant can be injected into the sealant injection sealing cavity 3 through the sealant injection assembly, and the sealant can be sealed with the outer side of the split polish rod through the sealant after the sealant is fully injected, and the sealant can be high-temperature-resistant sealant, so that the influence on the sealing performance due to high underground temperature can be avoided; the upper packing sealing body and the lower packing sealing body are matched, so that good sealing performance can be kept between the embodiment and the split polish rod; when the main polish rod needs to be replaced, the split polish rod can be lifted up to the position where the blowout preventing plunger 6 enters the blowout preventing pump cylinder 2, the upper end of the polish rod nipple is located above the upper packing sealing body, at least one nipple reducing section 29 is located above the upper packing sealing body, the position relation between the blowout preventing plunger 6 and the blowout preventing pump cylinder 2 is judged by the exposed number of the user-accessible nipple reducing sections 29, the blowout preventing plunger 6 is ensured to enter the blowout preventing pump cylinder 2, the blowout preventing plunger 6 is sealed through the blowout preventing sealing assembly, and underground sealing can be realized by the blowout preventing plunger 6, the blowout preventing sealing assembly and the blowout preventing pump cylinder 2, so that the main polish rod is convenient to replace. According to the embodiment, the sealing glue capable of resisting high temperature is injected into the glue injection sealing cavity 3, and the split type polished rod can be well sealed by matching with the upper packing sealing body and the lower packing sealing body, so that when the sealing device is used for replacing a main polished rod, the underground pressure holding is realized through the sealing formed by the blowout prevention plunger 6, the blowout prevention sealing assembly and the blowout prevention pump cylinder 2, the potential safety hazard is reduced, the dismounting of the embodiment and the additional well killing operation are not needed, the replacement of the split type polished rod is facilitated, and the sealing device has the characteristics of simplicity in operation and high working efficiency; the setting of the main rod reducing section 28 can be used for realizing the recording and comparison of the lower position of the split polish rod, the setting of the short section reducing section 29 can be used for conveniently identifying the lifting position of the blowout prevention plunger 6 during the replacement of the main polish rod, so that the replacement operation of the main polish rod is convenient, the setting of the main rod reducing section 28 and the short section reducing section 29 can be used for conveniently installing the prior known limiting device (such as a rope hanger and the like), thereby realizing the hanging limiting or lifting lowering operation of the split polish rod, and the outer wall of the split polish rod can not be damaged.
The polish rod replaceable assembly can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the upper packing sealing body comprises an upper packing casing 8, an upper pressing block 9, an upper tower packing 10, an upper packing ring 11, a spring 12 and a packing pressing piece 13, wherein an upper sealing channel sleeved on the outer side of the polish rod nipple and penetrating up and down is arranged in the middle of the upper packing casing 8, the upper pressing block 9, the upper tower packing 10 and the upper packing ring 11 are sequentially distributed on the inner side of the upper part of the upper sealing channel corresponding to the outer side of the polish rod nipple from top to bottom, an inner annular groove is formed on the inner side of the upper part of the upper pressing block 9, a spring 12 sleeved on the outer side of the polish rod nipple is arranged in the inner annular groove, the packing pressing piece 13 propped against the upper end face of the spring 12 is arranged on the outer side of the upper part of the upper packing casing 8, and the inner side of the upper part of the glue injection casing 1 are fixedly installed together. According to the requirement, the initial state of the spring 12 can be a compression state, so that the spring 12 can be kept in a compressed state by the action force of restoring deformation when the upper tower type packing 10 is deformed or worn, and the split type polish rod can be sealed by the upper packing sealing body; the upper backing ring 11 may be a copper backing ring; the upper tower packing 10 may employ a tower packing technique known in the art; the packing compresses tightly piece 13 can be cylindric gland, and cylindric gland includes apron and go-between cover, and the middle part of apron is equipped with the central through-hole that can overlap in the split type polished rod outside, and the lower extreme of apron is in the same place with the upper end of go-between cover, and the bottom surface of apron is seated on the up end of spring 12, and the lower part inboard of go-between cover and the upper portion outside of packing seal housing pass through threaded connection fixed mounting together, from this accessible packing compresses tightly piece 13 realization to the compaction of spring 12 up end.
As shown in fig. 1, the lower packing seal body comprises a lower packing shell 15, a lower pressing block 16, a lower tower packing 17 and a lower backing ring 18, wherein a lower sealing channel sleeved on the outer side of the polish rod nipple and penetrating up and down is arranged in the middle of the lower packing shell 15, a limiting ring table 19 sleeved on the outer side of the polish rod nipple is arranged on the inner side of the lower portion of the lower sealing channel, the outer side of the lower portion of the glue injection shell 1 and the inner side of the upper portion of the lower sealing channel are fixedly installed together, the lower pressing block 16, the lower tower packing 17 and the lower backing ring 18 are sequentially distributed between the lower sealing channel corresponding to the position between the glue injection shell 1 and the limiting ring table 19 and the polish rod nipple from top to bottom, the bottom surface of the glue injection shell 1 is propped against the top surface of the lower pressing block 16, the lower backing ring 18 is arranged on the limiting ring table 19, and a blowout preventing pump cylinder 2 is fixedly installed in the lower sealing channel corresponding to the position below the limiting ring table 19. Therefore, the split polish rod can be sealed through the lower packing sealing body. The lower backing ring 18 may be a copper backing ring, as desired; the internal diameter of blowout prevention pump section 2 can be greater than the internal diameter of spacing ring platform 19, when the lower part outside of polished rod nipple joint is equipped with nipple joint outer ring platform 14, the external diameter of nipple joint outer ring platform 14 is greater than the internal diameter of spacing ring platform 19, in split type polished rod conventional operating mode, nipple joint outer ring platform 14 should be located the below of blowout prevention pump section 2, and in split type polished rod lift change in-process, nipple joint outer ring platform 14 should be located blowout prevention pump section 2, the spacing of accessible spacing ring platform 19 to nipple joint outer ring platform 14 further strengthens the blowout prevention effect of this embodiment, avoid the optical rod nipple joint to follow this embodiment upper portion slippage when the effort is too big in the pit.
As shown in fig. 1, a lower packing housing 15 corresponding to the position of the lower tower packing 17 is provided with a bleed hole capable of communicating with the lower sealing passage, and a bleed valve assembly 27 is mounted on the bleed hole. From this the accessible bleed valve assembly 27 opens and close the realization to the detection of this embodiment sealing performance, when the split type polished rod of lifting up is needed, can lift up split type polished rod to prevent spouting in plunger 6 gets into blowout prevention pump cylinder 2 to form sealedly with blowout prevention pump cylinder 2 inboard through blowout prevention seal assembly, accessible opens bleed valve assembly 27 this moment and looks over whether gas leakage, if not gas leakage then indicates that this embodiment has established good leakproofness with split type polished rod, can change the operation to main polished rod, if gas leakage how indicates that the leakproofness between this embodiment and the split type polished rod is not good, there is the potential safety hazard, the user can carry out subsequent investigation. The bleed valve assembly 27 may employ known techniques as desired.
As shown in fig. 1, the outer side of the lower part of the glue injection shell 1 is fixedly installed with the inner side of the upper part of the lower sealing channel through threaded connection, the outer side of the lower part of the glue injection shell 1 is fixedly provided with a locking back cap 20 through threaded connection, the lower end of the locking back cap 20 is propped against the upper end face of the lower packing shell 15, and the lower sealing channel is fixedly installed with the blowout prevention pump cylinder 2 through threaded connection. Thereby, loosening of the lower packing housing 15 can be avoided, and the tightness of the lower packing seal can be maintained.
As shown in fig. 1, the sealing assembly comprises a C-ring pressing cap 21 and a scraping ring 22 which are all positioned on the outer side of the polish rod nipple; an upper mounting ring table 23 sleeved on the outer side of the polish rod nipple is arranged in a glue injection channel corresponding to the position above the glue injection sealing cavity 3, a C ring pressing cap 21 is arranged in the glue injection channel above the upper mounting ring table 23 in a limiting manner, and at least one glue scraping ring 22 is arranged in the glue injection channel at the position between the C ring pressing cap 21 and the upper mounting ring table 23; a lower mounting ring table 24 is arranged in the glue injection channel corresponding to the position below the glue injection sealing cavity 3, a C-ring pressing cap 21 is arranged in the glue injection channel below the lower mounting ring table 24 in a limiting manner, and at least one glue scraping ring 22 is arranged in the glue injection channel between the lower mounting ring table 24 and the C-ring pressing cap 21. According to the requirements, the sealing component can adopt the prior known technology; the doctor ring 22 may be a known one, such as a C-type doctor ring 22; two scraping rings 22 can be distributed in the vertical direction in the glue injection channel at the position between the C ring pressing cap 21 and the upper mounting ring table 23; two scraping rings 22 can be distributed in the vertical direction in the glue injection channel at the position between the lower mounting ring table 24 and the C ring pressing cap 21; the C-ring press cap 21 may be a conventional technique such as a snap spring. Therefore, the high-temperature-resistant sealant adhered to the split polish rod can be scraped by the scraping ring 22, so that the sealant is prevented from being brought out of the sealant injection sealing cavity 3 in the vertical movement of the split polish rod, the loss of the sealant is reduced, and good tightness can be kept between the sealant and the split polish rod; the scraping ring 22 can be limited by the C-ring pressing cap 21.
As shown in fig. 1, the glue injection assembly comprises a glue injection nozzle 25 and a bolt switch 26, wherein the glue injection nozzle 25 is arranged on the outlet of the glue injection side, a glue injection through hole is arranged in the middle of the glue injection nozzle 25, and the bolt switch 26 capable of plugging and opening the glue injection through hole is arranged on the glue injection nozzle 25. Therefore, the glue injection operation can be realized by opening the glue injection assembly, and the leakage of the sealing glue which can resist high temperature can be prevented by closing the glue injection assembly. The glue nozzle 25 and the bolt switch 26 may be of known art, as desired.
Embodiment three; as shown in fig. 1, the polish rod replacement process of the polish rod replaceable assembly according to the second embodiment includes the following steps:
the first step, the split polish rod is lifted to the top end of the polish rod nipple located above the upper packing sealing body, at least one nipple reducing section 29 is located above the upper packing sealing body, and the blowout prevention plunger 6 is located in the blowout prevention pump cylinder 2 and forms a seal through a blowout prevention sealing assembly;
secondly, a limiting device is arranged outside the short section reducing section 29 near the upper end face of the upper packing sealing body, and the limiting device is arranged on the upper packing sealing body by adjusting the position of the split polish rod;
step three, the main polish rod is disassembled, and the main polish rod to be replaced is arranged above the polish rod nipple;
and fourthly, the split polish rod is lowered to the bottom of the wellhead connecting pipe string, at least one main rod diameter-reducing section 28 is positioned above the upper packing sealing body, and the number of the main rod diameter-reducing sections 28 positioned above the upper packing sealing body is recorded. Therefore, the polish rod replacement operation can be completed, the split polish rod can be lifted up and lowered down in a conventional manner, the number of the main rod diameter reduction sections 28 exposed from the upper part of the main polish rod of a user can record the position of each split polish rod lowering, the number of the main rod diameter reduction sections 28 exposed can be used for judging whether the split polish rod is lowered down to the bottom, and the positions of each split polish rod lowering can be compared. Through this embodiment through polish rod replacement operation easy operation, labour saving and time saving, convenient high efficiency, and realize hanging spacingly through installing stop device in nipple joint reducing section 29 outside, can not harm the surface of split type polished rod, help prolonging its life. According to the requirement, the limiting device can be a conventional limiting device, such as a rope hanger.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (10)
1. The split type polish rod is characterized by comprising a main polish rod, polish rod short sections and blowout prevention plungers, which are sequentially connected from top to bottom, wherein the main polish rod comprises a main rod diameter-expanding section and a main rod diameter-reducing section which are coaxially distributed, the main rod diameter-expanding sections are distributed at intervals along the vertical direction, each two adjacent main rod diameter-expanding sections are connected with the main rod diameter-reducing section, the number of the main rod diameter-reducing sections is at least one, at least one main rod diameter-reducing section is positioned at the upper part of the main polish rod, the polish rod short sections comprise a short section diameter-expanding section and a short section diameter-reducing section which are coaxially distributed, the short section diameter-expanding sections are distributed at intervals along the vertical direction, each two adjacent short section diameter-expanding sections are connected with short section diameter-reducing sections, the number of the short section diameter-reducing sections positioned at the bottom is at the upper part of the polish rod short section, the lower end of the main rod diameter-expanding section positioned at the bottom and the short section diameter-expanding section diameter-reducing section positioned at the top are fixedly mounted together, the lower part of the diameter-expanding section is fixedly provided with the blowout prevention plungers, and the lower part of the blowout prevention plungers is fixedly mounted with the short section diameter-expanding sections positioned at the bottom section diameter-reducing sections, and the short section diameter-reducing sections and the diameter-reducing sections are fixedly arranged to be connected with the short section diameter-reducing sections and the blowout prevention sections and the sealing sections. The diameters of all the main rod diameter-expanding sections and the short joint diameter-expanding sections are equal, the diameter of the main rod diameter-reducing section or the diameter of the external circle is smaller than that of the main rod diameter-expanding section, and the diameter of the short joint diameter-reducing section or the diameter of the external circle is smaller than that of the short joint diameter-expanding section.
2. The split polish rod of claim 1, wherein the main rod diameter-reducing section has a cylindrical or regular polygon cross section, and the short-section diameter-reducing section has a cylindrical or regular polygon cross section.
3. The split polish rod according to claim 1 or 2, wherein the outer side of the upper part of the blowout prevention plunger is provided with a plunger outer ring table, the blowout prevention sealing assembly comprises an upper supporting ring, a middle supporting ring, a lower supporting ring, a sealing inner ring and a sealing ring, the outer side of the blowout prevention plunger corresponding to the lower position of the plunger outer ring table is sequentially sleeved with the upper supporting ring, the sealing inner ring, the middle supporting ring, the sealing inner ring and the lower supporting ring from top to bottom, the upper end of the blowout prevention plunger is fixedly provided with a blowout prevention fastener which is propped against the lower supporting ring, the top of the upper supporting ring is propped against the bottom of the plunger outer ring table, and the outer side of each sealing inner ring is provided with the sealing ring.
4. The split polish rod according to claim 1 or 2, wherein the outer side of the lower part of the short-joint diameter-reducing section at the bottom is provided with a short-joint outer ring table, the outer side of the lower part of the short-joint diameter-reducing section at the bottom and the inner side of the upper part of the blowout-preventing plunger are fixedly installed together through threaded connection, an anti-drop gasket is arranged between the outer side of the lower part of the short-joint diameter-reducing section at the bottom and the inner side of the upper part of the blowout-preventing plunger, and the lower end of the main rod diameter-expanding section at the bottom and the short-joint diameter-expanding section at the top are fixedly installed together through threaded connection, and the anti-drop gasket is arranged between the outer side of the short-joint diameter-reducing section and the inner side of the blowout-preventing plunger.
5. The polish rod replaceable assembly using the split polish rod of any one of claims 1 to 4 is characterized by comprising a split polish rod and a replaceable polish rod blowout prevention box, wherein the replaceable polish rod blowout prevention box comprises a glue injection shell, a glue sealing component, a glue injection component, an upper packing seal, a lower packing seal and a blowout prevention pump cylinder, the upper packing seal, the glue injection shell, the lower packing seal and the blowout prevention pump cylinder are sequentially distributed outside the split polish rod from top to bottom, the upper packing seal is fixedly arranged on the upper part of the glue injection shell, the lower packing seal is fixedly arranged on the lower part of the glue injection shell, the upper packing seal and the lower packing seal form a seal with the outside of the polish rod, at least one nipple diameter reduction section is positioned above the upper packing seal, the blowout prevention pump cylinder is fixedly arranged on the lower part of the lower packing seal, the blowout prevention plunger is positioned in the blowout prevention pump cylinder, the two are sequentially distributed by the blowout prevention pump cylinder, the outer diameters of the main rod diameter reduction section and the lower packing seal are smaller than the outer diameter of the blowout prevention pump cylinder, the inner diameter section can be communicated with the glue injection pump cylinder at least one sealing outlet can be formed by the sealing channel at the inner side of the sealing sleeve, and the sealing channel can be opened at the inner side of the sealing outlet of the sealing channel of the upper sealing sleeve can be formed between the two sealing side of the sealing sleeve and the sealing channel can be opened at the inner side of the sealing sleeve, and the sealing channel can be opened at the sealing outlet side can be formed at the position of the inner side of the sealing channel can be opened, and the sealing channel can be sealed at the sealing outlet can be sealed.
6. The polish rod replaceable assembly according to claim 5, wherein the upper packing sealing body comprises an upper packing shell, an upper pressing block, an upper tower packing, an upper backing ring, a spring and a packing pressing piece, an upper sealing channel sleeved on the outer side of the polish rod nipple and penetrating up and down is arranged in the middle of the upper packing shell, the upper pressing block, the upper tower packing and the upper backing ring are sequentially distributed on the inner side of the upper portion of the upper sealing channel corresponding to the outer side of the polish rod nipple from top to bottom, an inner annular groove is formed on the inner side of the upper portion of the upper pressing block, a spring sleeved on the outer side of the polish rod nipple is arranged in the inner annular groove, the packing pressing piece propped against the upper end face of the spring is arranged on the outer side of the upper portion of the upper packing shell, and the inner side of the upper portion of the upper packing shell and the upper portion of the glue injection shell are fixedly arranged together.
7. The polish rod replaceable assembly according to claim 5, wherein the lower packing sealing body comprises a lower packing shell, a lower pressing block, a lower tower packing and a lower backing ring, a lower sealing channel sleeved on the outer side of the polish rod nipple and penetrating up and down is arranged in the middle of the lower packing shell, a limiting ring table sleeved on the outer side of the polish rod nipple is arranged on the inner side of the lower portion of the lower sealing channel, the outer side of the lower portion of the glue injection shell and the inner side of the upper portion of the lower sealing channel are fixedly installed together, a lower pressing block, a lower tower packing and a lower backing ring are sequentially distributed between the lower sealing channel and the polish rod nipple from top to bottom, the bottom surface of the glue injection shell is abutted against the top surface of the lower pressing block, the lower backing ring is arranged on the limiting ring table, and a blowout preventing pump cylinder is fixedly installed in the lower sealing channel corresponding to the position below the limiting ring table.
8. The polish rod replaceable assembly according to claim 7, wherein the lower packing housing corresponding to the lower tower packing position is provided with a bleed hole capable of communicating with the lower sealing passage, and the bleed hole is provided with a bleed valve assembly.
9. The polish rod replaceable assembly according to claim 7 or 8, wherein the outer side of the lower part of the glue injection shell is fixedly installed with the inner side of the upper part of the lower sealing channel through threaded connection, the outer side of the lower part of the glue injection shell is fixedly installed with a locking back cap through threaded connection, the lower end of the locking back cap is abutted against the upper end face of the lower packing shell, and the lower sealing channel is fixedly installed with the blowout prevention pump cylinder through threaded connection; or/and the sealing assembly comprises a C-ring pressing cap and a scraping ring which are all positioned at the outer side of the polish rod nipple; an upper mounting ring table sleeved on the outer side of the polish rod nipple is arranged in the glue injection channel corresponding to the position above the glue injection sealing cavity, a C ring pressing cap is arranged in the glue injection channel above the upper mounting ring table in a limiting manner, and at least one glue scraping ring is arranged in the glue injection channel at the position between the C ring pressing cap and the upper mounting ring table; a lower mounting ring table is arranged in the glue injection channel corresponding to the position below the glue injection sealing cavity, a C-ring pressing cap is arranged in the glue injection channel below the lower mounting ring table in a limiting manner, and at least one glue scraping ring is arranged in the glue injection channel at the position between the lower mounting ring table and the C-ring pressing cap; or/and, the glue injection assembly comprises a glue injection nozzle and a bolt switch, the glue injection nozzle is arranged on the outlet of the glue injection side, a glue injection through hole is formed in the middle of the glue injection nozzle, and the bolt switch capable of plugging and opening the glue injection through hole is arranged on the glue injection nozzle.
10. A polish rod replacement process of the polish rod replaceable assembly according to any one of claims 5 to 9, comprising the steps of:
the method comprises the steps that a split polish rod is lifted to the top end of a short section of the polish rod to be located above an upper packing sealing body, at least one short section diameter-reducing section is located above the upper packing sealing body, a blowout prevention plunger is located in a blowout prevention pump barrel, and the two sections are sealed through a blowout prevention sealing assembly;
secondly, installing a limiting device on the outer side of the shrinkage section of the short section near the upper end surface of the upper packing sealing body, and enabling the limiting device to be arranged on the upper packing sealing body by adjusting the position of the split polish rod;
step three, the main polish rod is disassembled, and the main polish rod to be replaced is arranged above the polish rod nipple;
and fourthly, the split polish rod is lowered to the bottom of the wellhead connecting pipe string, at least one main rod diameter-reducing section is positioned above the upper packing sealing body, and the number of the main rod diameter-reducing sections positioned above the upper packing sealing body is recorded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082341.2A CN109184582B (en) | 2018-09-17 | 2018-09-17 | Split polish rod, polish rod replaceable assembly and polish rod replacement process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082341.2A CN109184582B (en) | 2018-09-17 | 2018-09-17 | Split polish rod, polish rod replaceable assembly and polish rod replacement process |
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| Publication Number | Publication Date |
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| CN109184582A CN109184582A (en) | 2019-01-11 |
| CN109184582B true CN109184582B (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811082341.2A Active CN109184582B (en) | 2018-09-17 | 2018-09-17 | Split polish rod, polish rod replaceable assembly and polish rod replacement process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116988780B (en) * | 2023-09-26 | 2024-01-30 | 克拉玛依红山油田有限责任公司 | Wellhead packing puncture leakage alarm method and device |
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| CN109184582A (en) | 2019-01-11 |
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