CN113982530B - Drilling-plug-free stage cementing device and using method thereof - Google Patents
Drilling-plug-free stage cementing device and using method thereof Download PDFInfo
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- CN113982530B CN113982530B CN202111586702.9A CN202111586702A CN113982530B CN 113982530 B CN113982530 B CN 113982530B CN 202111586702 A CN202111586702 A CN 202111586702A CN 113982530 B CN113982530 B CN 113982530B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 94
- 238000007789 sealing Methods 0.000 claims description 57
- 239000004568 cement Substances 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000013016 damping Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 8
- 238000003801 milling Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a drilling-plug-free stage cementing device and a using method thereof. Exempt from to bore stopper stage cementing device, including urceolus and inner tube, the urceolus lateral wall is equipped with first through-hole, the inner tube lateral wall is equipped with the second through-hole, the urceolus lower extreme is equipped with the lower clutch, and the upper end is equipped with the top connection, but be equipped with shutoff or intercommunication from top to bottom between urceolus and the inner tube first through-hole with the sliding sleeve of closing of second through-hole with open the sliding sleeve, the lower terminal surface axial of inner tube is equipped with the direction spout, with the corresponding guide arm mechanism of direction spout is fixed in through the fourth shear pin the lower clutch inside wall, the pit shaft can all be salvaged out through fisher to inner tube and guide arm mechanism. The invention realizes the internal communication of the stage cementing device by fishing out the accessory, does not need to drill a plug, has large internal drift diameter, high well completion efficiency, stable pipe string connection, good damping effect, process stability and safety.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a drilling-plug-free stage cementing device and a using method thereof.
Background
When the oil and gas well is fixed, well cement needs to be injected into the shaft, and then a cement plug is put into the well to extrude the well cement in the shaft into the space between the open hole wall and the oil pipe. Some special occasions need to adopt a staged cementing process to meet the requirements of on-site well cementation construction, for example, wells with excessive cement injection amount at one time, wells with stratum incapable of bearing excessive liquid column pressure, wells with complex layer positions needing to be sealed, wells with cementing sections with large temperature difference from top to bottom, and the like, including the prior oil field which is mainly popularized and used in the top cementing process of a horizontal well screen pipe, also need to adopt the staged cementing process. Need adopt the stage cementing ware among the stage cementing technology, the inside annex that realizes suppressing pressure and stage cementing that is equipped with of stage cementing ware, present commonly used bores stopper type stage cementing ware, after the cementing, need bore the annex and remove just can realize the pit shaft and link up, has following problem in the use:
1. the drilling and plugging time is long, the opening sliding sleeve and the closing sliding sleeve of the common hydraulic opening and hydraulic closing stage cementing device are both made of cast aluminum, the inner diameter is smaller, the tool length is long, and simultaneously the rubber plug seat or the blind plate are both processed by cast aluminum, so that the problems of large drilling and milling workload and long drilling and milling time are caused, the well completion period is prolonged, in addition, the problems of drilling deviation, drilling leakage and the like exist, and the later-stage oil extraction operation is greatly influenced;
2. the inner drift diameter is small after drilling and milling, for a 7in casing, drilling and milling construction is usually carried out by adopting a drill bit with the diameter of 152mm, and the drift diameter formed after drilling and plugging is small, so that the running of a subsequent construction pipe column is not facilitated;
3. in the pressure building process, the sliding sleeve is opened and closed to slide under the action of pressure and collide with the pipe body, so that larger vibration is caused, and the service life and the sealing property of the pipe body are influenced;
4. the locking performance of the stage cementing device and the pipe string is poor, and the connection stability of the pipe string is influenced.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a drill-plug-free stage cementing device which comprises an outer cylinder and an inner cylinder, wherein a first through hole is formed in the side wall of the outer cylinder, a second through hole is formed in the side wall of the inner cylinder, a lower connector is arranged at the lower end of the outer cylinder, an upper connector is arranged at the upper end of the outer cylinder, a closing sliding sleeve and an opening sliding sleeve which can block or communicate the first through hole and the second through hole are arranged between the outer cylinder and the inner cylinder from top to bottom, the closing sliding sleeve and the opening sliding sleeve are controlled by the inner cylinder to axially slide, a guide sliding groove is axially arranged on the lower end surface of the inner cylinder, a guide rod mechanism corresponding to the guide sliding groove is fixed on the inner side wall of the lower connector through a fourth shear pin, and the inner cylinder and the guide rod mechanism can be fished out of a shaft through a fisher.
Preferably, close the sliding sleeve and be fixed in through first shear pin the inside wall of urceolus, the inside wall axial that closes the sliding sleeve is equipped with first spout, the lateral wall of inner tube is equipped with can gliding third shear pin in first spout, it is fixed in through the second shear pin to open the sliding sleeve the lateral wall of inner tube, it is equipped with the second spout to open sliding sleeve inside wall axial, the lateral wall of inner tube be equipped with can gliding radial telescopic machanism in the second spout.
Preferably, radial telescopic machanism is including the third spout of radial setting and rather than the fourth spout of intercommunication, be equipped with first spring and first slider in the third spout, be equipped with second spring and second slider in the fourth spout, be equipped with on the first slider with the corresponding first embedded groove of second slider, under the initial condition, first spring extends naturally, first slider butt respectively the up end of second spout with the second slider, two butt departments are inclined plane, under the second spring state of extending naturally, the second slider inserts in the first embedded groove.
Preferably, the closing sliding sleeve, the opening sliding sleeve and the lower joint are provided with a first locking mechanism respectively, the first locking mechanism comprises a spherical plug arranged at one end to be locked and a second embedded groove arranged at the other end to be locked, an elastic sealing sleeve fixing groove and a first placing groove arranged close to the inlet end of the second embedded groove are arranged in the second embedded groove, the elastic sealing sleeve is fixed in the elastic sealing sleeve fixing groove, a second placing groove is circumferentially arranged on the outer side wall of the elastic sealing sleeve fixing groove, and a clamp spring is arranged between the first placing groove and the second placing groove.
Preferably, the guide rod mechanism comprises an annular first base and a guide pillar arranged on the upper end face of the first base, the upper end of the guide pillar is fixedly connected with a piston, the piston slides in the guide chute in a sealing manner, a first air passage is arranged in the piston, a curved second air passage is arranged in the guide pillar, a third air passage communicated with the outside is arranged in the first base, the first air passage, the second air passage and the third air passage are sequentially communicated to form a gas flow passage, the piston slides in the guide chute in a sealing manner, and the first air passage is a stepped hole with a diameter reduced from top to bottom.
Preferably, a second locking mechanism is arranged at one end of the inner cylinder opposite to the guide rod mechanism, the second locking mechanism comprises an insertion part arranged at one end to be locked and a locking part arranged at the other end to be locked,
the inserting part comprises a second base, a cylinder is arranged below the second base, a center hole is formed in the center of the cylinder, a step hole with the diameter decreasing in the radial direction is formed in the side wall of the cylinder, a ball head rod is arranged in the step hole and comprises a ball head part, a fourth spring and a rod part which are sequentially connected and fixed, the ball head part can slide in a large-aperture section of the step hole, the rod part can slide in a small-aperture section of the step hole, one end of a third spring is fixed in the large-aperture section, the other end of the third spring is connected with the ball head part, and the ball head part extends into the center hole and the rod part is accommodated in the step hole under the natural extension state of the third spring and the fourth spring;
the locking part comprises a step groove corresponding to the second base and the cylinder, a slot corresponding to the ball head rod is arranged on the side wall of the step groove, a threaded rod is arranged at the center of the bottom, the upper end of the threaded rod is a spherical surface, the lower end of the threaded rod is in threaded connection and penetrates through the other end to be locked to be connected with a knob,
and after the insertion part is completely inserted into the locking part, the threaded rod is inserted into the central hole and pushes the ball head rod to be inserted into the slot to complete locking.
Preferably, the lower end of the inner side wall of the inner cylinder is provided with an opening plug seat, the opening plug seat is sealed on the opening plug seat, and the opening plug is provided with a sealing structure.
Preferably, the sealing structure is located including locating recess and the circumference of treating the seal up end treat the elastic sealing ring groove of seal lateral wall, be equipped with the intercommunication on the elastic sealing ring groove the third through-hole of recess, the elastic sealing ring cover is located the elastic sealing ring inslot, the inside toroidal cavity that is equipped with of elastic sealing ring, the inside wall is equipped with the intercommunication toroidal cavity's connecting pipe, the connecting pipe is fixed in the third through-hole.
Preferably, the upper end of the inner cylinder is provided with a closing plug seat, the closing plug seat is sealed on the closing plug seat, one end, opposite to the inner cylinder, of the closing plug is provided with the second locking mechanism, the closing plug is provided with the sealing structure, an internal thread is arranged in a groove of the sealing structure, and the fisher is in threaded connection with the groove.
The invention provides a using method of a drilling plug-free stage cementing device, which comprises the following steps:
step S100, primary cementing: under the initial state of the drilling-plug-free stage cementing device, the first locking mechanism locks and closes the sliding sleeve and opens the sliding sleeve, the circulation hole formed by the first through hole and the second through hole is closed, and cement is injected into the annulus of the well section at the downstream of the drilling-plug-free stage cementing device;
step S200, opening a circulation hole: the opening plug is put into the opening seat, after the opening plug is seated on the opening plug seat, pressure is build up in the oil pipe, the opening plug drives the inner cylinder and the opening sliding sleeve to slide downwards under the action of pressure, the first locking mechanism on the closing sliding sleeve and the opening sliding sleeve is opened, a gap is generated between the opening sliding sleeve and the closing sliding sleeve, the opening sliding sleeve slides downwards to the lower joint and is locked on the lower joint through the first locking mechanism, and at the moment, a second through hole on the inner cylinder is aligned with a first through hole on the outer cylinder to form a communicated circulating hole;
step S300, secondary cementing: performing circulating well flushing through the circulating hole, and then injecting cement into a well section annular space on the upstream of the drilling plug-free stage cementing device through the circulating hole;
step S400, closing the circulation hole: a closing plug is put in, after the closing plug is locked by a second locking mechanism and is seated on a closing plug seat, pressure is build up in the oil pipe, the closing plug drives the inner cylinder to continuously slide downwards under the action of pressure, a first shear pin on the closing sliding sleeve and a second shear pin on the opening sliding sleeve are sheared off, the closing sliding sleeve slides downwards to the upper end face of the opening sliding sleeve, the closing sliding sleeve and the opening sliding sleeve are locked again by the first locking mechanism, at the moment, the inner cylinder and the guide rod mechanism are locked by the second locking mechanism, and the circulation hole is closed;
step S500, unlocking the inner barrel: continuing suppressing pressure in the oil pipe, shearing a third shear pin on the inner cylinder and a fourth shear pin on the guide rod mechanism under the action of pressure, sliding the inner cylinder downwards, and stopping sliding after a first sliding block of a radial telescopic mechanism on the inner cylinder slides to the lower end face of the second sliding chute;
step S600, salvaging accessories: after the fisher is fixedly connected with the closing plug through threads, the closing plug is lifted, and the closing plug, the inner cylinder and the guide rod mechanism which are sequentially locked and connected and the opening plug which is seated in the inner cylinder are smoothly taken out.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention realizes the internal communication of the stage cementing device by fishing out accessories (the inner cylinder and the guide rod mechanism), does not need to drill a plug, has large internal communication diameter, high well completion efficiency and good safety, and is beneficial to the later-stage oil extraction operation;
2. the inner cylinder and the guide rod mechanism are matched with each other to slide, so that the circumferential sliding rotation of the inner cylinder during pressure building can be prevented, and the process stability is improved;
3. the inner cylinder is provided with the reusable radial telescopic mechanism, so that the inner cylinder can be lifted out of the shaft without hindrance, and the use amount of the shear pins is reduced;
4. the first locking mechanism is used for realizing the sealing and locking among the closing sliding sleeve, the opening sliding sleeve and the lower connector, ensuring the stability of pipe string connection, and simultaneously playing a role in buffering the closing sliding sleeve, the opening sliding sleeve and the lower connector which are in quick contact in a pressure-out state, reducing vibration and impact generated by collision, improving the process stability and prolonging the service life of components;
5. a closed sliding space is formed between the piston on the guide rod mechanism and the guide chute of the inner cylinder in a surrounding manner, air in the sliding space is communicated with the outside through the air flow channel, and when the inner cylinder is pressed down, the air in the sliding space is subjected to resistance in the process of being discharged to the outside, so that the inner cylinder slowly falls, the vibration is reduced, and the process stability and the safety are further improved;
6. the opposite ends of the inner cylinder and the guide rod mechanism and the opposite ends of the inner cylinder and the closing plug are respectively provided with a second locking mechanism, and the automatic connection of the pipe string is realized through the second locking mechanisms, so that accessories in the drilling-plug-free stage cementing device can be conveniently fished out of a shaft, and the working efficiency is improved;
7. the opening plug and the closing plug are both provided with sealing structures, and in a pressure-holding state, gas enters an annular cavity of an elastic sealing ring on the sealing structures to enable the elastic sealing ring to expand and abut against the inner cylinder, so that the sealing effect is further improved;
in conclusion, the invention realizes the internal communication of the stage cementing device by fishing out the accessory, does not need to drill a plug, has large internal communication diameter, high well completion efficiency, stable pipe string connection, good damping effect, process stability and safety.
Drawings
FIG. 1 is a schematic structural diagram of an initial state of the present invention;
FIG. 2 is an enlarged view of a portion of the radial expansion mechanism of FIG. 1;
FIG. 3 is an enlarged view of a portion of the first locking mechanism of FIG. 1;
FIG. 4 is a schematic structural view of a second locking mechanism of the present invention;
FIG. 5 is a schematic view of the structure when the opening plug is inserted;
FIG. 6 is a schematic view of a sealing structure;
FIG. 7 is a schematic view of the structure of the opening plug sliding downwards during pressure build-up;
FIG. 8 is a schematic view of the structure when the closing plug is put in;
FIG. 9 is a schematic view of the structure of the downward sliding of the closing plug during pressure building;
FIG. 10 is a schematic structural diagram of the unlocking process of the inner cylinder when the pressure continues to be applied.
Description of reference numerals:
1. an outer cylinder, 2, an inner cylinder, 3, a lower joint, 4, an upper joint, 5, a closing sliding sleeve, 6, an opening sliding sleeve, 7, a guide rod mechanism, 8, a first locking mechanism, 9, a second locking mechanism, 10, an opening plug, 11, a sealing structure, 12 and a closing plug,
101. a first through-hole is formed in the first substrate,
201. a second through hole 202, a guide chute 203, a third shear pin 204, a plug seat opening 205, a plug seat closing 205,
210. a radial telescopic mechanism 2101, a third slide groove, 2102, a first spring, 2103, a first slide block, 2104, a first embedded groove, 2105, a fourth slide groove, 2106, a second spring, 2107, a second slide block,
501. a first shear pin, 502, a first runner,
601. a second shear pin, 602, a second runner,
701. a fourth shear pin, 702, a first base, 703, a guide post, 704, a piston, 705, a first air passage, 706, a second air passage, 707, a third air passage,
801. a spherical plug 802, a second embedded groove 803, an elastic sealing sleeve 804, a snap spring 805, an elastic sealing sleeve fixing groove 806, a first placing groove 807, a second placing groove,
910. an inserting part 9101, a second base 9102, a cylinder 9103, a center hole 9104, a step hole 9105, a ball head rod 9106, a third spring,
920. a locking part 9201, a step groove 9202, a slot 9203, a threaded rod 9204 and a knob,
1101. a groove 1102, an elastic sealing ring groove 1103, a third through hole 1104, an elastic sealing ring 1105 and a connecting pipe.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
With reference to fig. 1 to 10, an embodiment of the present invention provides a drilling-plug-free stage cementing device, which includes an outer cylinder 1 and an inner cylinder 2, wherein a first through hole 101 is formed in a sidewall of the outer cylinder 1, a second through hole 201 is formed in a sidewall of the inner cylinder 2, a lower joint 3 is formed at a lower end of the outer cylinder 1, an upper joint 4 is formed at an upper end of the outer cylinder, a closing sliding sleeve 5 and an opening sliding sleeve 6 which can block or communicate the first through hole 101 and the second through hole 201 are formed between the outer cylinder 1 and the inner cylinder 2 from top to bottom, the closing sliding sleeve 5 and the opening sliding sleeve 6 are controlled by the inner cylinder 2 to axially slide, a guide sliding groove 202 is axially formed in a lower end surface of the inner cylinder 2, a guide rod mechanism 7 corresponding to the guide sliding groove 202 is fixed to an inner sidewall of the lower joint 3 through a fourth shear pin 701, and both the inner cylinder 2 and the guide rod mechanism 7 can be fished out of a wellbore.
In the above technical solution, the inner cylinder 2 controls the relative sliding of the closing sliding sleeve 5 and the opening sliding sleeve 6 to perform stage cementing, in an initial state, as shown in fig. 1, the closing sliding sleeve 5 and the opening sliding sleeve 6 contact each other to form an annular plugging layer, the first through hole 101 on the outer cylinder 1 and the second through hole 201 on the inner cylinder 2 are sealed and isolated, and the circulation hole formed by the first through hole 101 and the second through hole 201 is closed, in this state, the primary cementing can be performed, and at this time, cement is injected into the annulus of the well section at the downstream of the drilling-free stage cementing device.
After the first cement injection is completed, the opening plug 10 is put into the inner barrel 2, as shown in fig. 5, after the opening plug 10 is seated on the opening plug seat 204, pressure is built in the oil pipe, under the action of pressure, the opening plug 10 drives the inner barrel 2 and the opening sliding sleeve 6 to slide downwards, as shown in fig. 7, a gap is generated between the opening sliding sleeve 6 and the closing sliding sleeve 5, the opening sliding sleeve 6 slides downwards to the lower joint 3, and at the moment, the second through hole 201 on the inner barrel 2 is aligned with the first through hole 101 on the outer barrel 1 to form a communicated circulation hole; at this time, secondary cementing can be carried out, and cement is injected into the annulus of the well section at the upstream of the drilling-plug-free stage cementing device.
After the second cementing is completed, the closing plug 12 is put in, as shown in fig. 8, after the closing plug 12 is seated on the closing plug seat 205, the pressure is built up in the oil pipe, under the action of the pressure, the closing plug 12 drives the inner cylinder 2 to continuously slide down, as shown in fig. 9, the inner cylinder 2 drives the closing sliding sleeve 5 to slide down to the upper end face of the opening sliding sleeve 6, an annular plugging layer is formed by the closing sliding sleeve 5 and the opening sliding sleeve 6 again, the first through hole 101 on the outer cylinder 1 and the second through hole 201 on the inner cylinder 2 are sealed and isolated, and the circulation hole is closed again. The attachment (inner barrel 2 and guide rod mechanism 7) as well as the closing plug 12 and opening plug 10 are fished out of the wellbore by a fisher.
The inside that this embodiment can realize stage cementing device through salvage the annex (inner tube 2 and guide arm mechanism 7) and link up, and need not bore these annexs and remove, well completion is efficient, and interior latus rectum is big, and the security is good, is favorable to later stage oil recovery operation. In addition, through the mutual cooperation of inner tube 2 and guide arm mechanism 7 slip, can prevent that inner tube 2 from slipping in the circumference when suppressing pressure, improve technological stability.
Among the above-mentioned technical scheme, can adopt the ordinary temporary fixing spare among the prior art, to carry out temporary fixation to outer tube 1, close sliding sleeve 5, open sliding sleeve 6, inner tube 2 and guide arm mechanism 7. In the present invention, O-ring seals (not shown in the figure) are used to seal between the outer cylinder 1 and the closing sliding sleeve 5, between the outer cylinder 1 and the opening sliding sleeve 6, between the closing sliding sleeve 5 and the inner cylinder 2, and between the opening sliding sleeve 6 and the inner cylinder 2, which are the common technical means in the field and will not be described in detail.
In one embodiment, a set of staples is used to effect the temporary fixation. As shown in fig. 1, the closing sliding sleeve 5 is fixed on the inner side wall of the outer barrel 1 through a first shear pin 501, a first sliding groove 502 is axially arranged on the inner side wall of the closing sliding sleeve 5, a third shear pin 203 which can slide in the first sliding groove 502 is arranged on the outer side wall of the inner barrel 2, the opening sliding sleeve 6 is fixed on the outer side wall of the inner barrel 2 through a second shear pin 601, a second sliding groove 602 is axially arranged on the inner side wall of the opening sliding sleeve 6, and a radial telescopic mechanism 210 which can slide in the second sliding groove 602 is arranged on the outer side wall of the inner barrel 2.
Among the above-mentioned technical scheme, inner tube 2 can slide in the first spout 502 of closing sliding sleeve 5 through third shear pin 203, slide in the second spout 602 of opening sliding sleeve 6 through radial telescopic machanism 210, both realized inner tube 2 and closed sliding sleeve 5 and opened the axial relative slip between the sliding sleeve 6, can prevent again that inner tube 2 from with close sliding sleeve 5 and open the circumference slip between the sliding sleeve 6, first spout 502 and the equal circumference equidistance of second spout 602 set up a plurality ofly. When the inner cylinder 2 is salvaged, the radial telescopic mechanism 210 is contracted under the extrusion of the shaft, so that the inner cylinder 2 can be lifted out of the shaft without hindrance, the radial telescopic mechanism 210 can be repeatedly used in the next well cementation cycle, and the use number of shear pins is reduced.
In a specific embodiment, the solution of the radial telescopic mechanism 210 is as follows, as shown in fig. 2, the radial telescopic mechanism 210 includes a third slide slot 2101 arranged radially and a fourth slide slot 2105 communicated therewith, a first spring 2102 and a first slide block 2103 are arranged in the third slide slot 2101, a second spring 2106 and a second slide block 2107 are arranged in the fourth slide slot 2105,
the first sliding block 2103 is provided with a first embedded groove 2104 corresponding to the second sliding block 2107, in an initial state, the first spring 2102 naturally extends, the first sliding block 2103 is respectively abutted to the upper end surface of the second sliding chute 602 and the second sliding block 2107, both abutted parts are inclined planes, and the second sliding block 2107 is inserted into the first embedded groove 2104 in the naturally extending state of the second spring 2106.
Above-mentioned technical scheme simple structure can realize the quick radial locking of first slider 2103 through the extrusion of pit shaft lateral wall, when needs unblock it, only need select for the wedge of rectangular shape to insert first embedded groove 2104 in, extrude second slider 2107 make it slide to in the fourth spout 2105 can.
In a specific embodiment, as shown in fig. 1 and 3, a first locking mechanism 8 is respectively disposed at one end of the closing sliding sleeve 5 opposite to the opening sliding sleeve 6 and at one end of the opening sliding sleeve 6 opposite to the lower joint 3, the first locking mechanism 8 includes a spherical plug 801 disposed at one end to be locked and a second insertion groove 802 disposed at the other end to be locked, an elastic sealing sleeve fixing groove 805 and a first placing groove 806 disposed near an inlet end of the second insertion groove 802 are disposed in the second insertion groove 802, an elastic sealing sleeve 803 is fixed in the elastic sealing sleeve fixing groove 805, a second placing groove 807 is circumferentially disposed on an outer sidewall of the elastic sealing sleeve 803, and a snap spring 804 is disposed between the first placing groove 806 and the second placing groove 807.
Among the above-mentioned technical scheme, can realize closing sliding sleeve 5, opening the sealed locking between sliding sleeve 6 and the lower clutch 3 through first locking mechanism 8. The stability of pipe string connection is guaranteed, the elastic sealing sleeve 803 and the clamp spring 804 can play a locking role, and can play a buffering role in closing the sliding sleeve 5, opening the sliding sleeve 6 and the lower connector 3 which are in quick contact under a pressure building state, so that the vibration and impact generated by collision are reduced, and the process stability and the service life of parts are improved.
In a specific embodiment, the guide rod mechanism 7 is implemented as follows, as shown in fig. 1, the guide rod mechanism 7 includes an annular first base 702 and a guide post 703 disposed on an upper end surface of the first base 702, an upper end of the guide post 703 is fixedly connected to a piston 704, the piston 704 hermetically slides in the guide chute 202, a first air passage 705 is disposed in the piston 704, a curved second air passage 706 is disposed in the guide post 703, a third air passage 707 communicated with the outside is disposed in the first base 702, the first air passage 705, the second air passage 706 and the third air passage 707 are sequentially communicated to form an air flow passage, the piston 704 hermetically slides in the guide chute 202, and the first air passage 705 is a stepped hole with a diameter decreasing from top to bottom.
Among the above-mentioned technical scheme, enclose between piston 704 and the direction spout 202 and close and form confined sliding space, air in this sliding space passes through gas flow channel and external intercommunication, in the inner tube 2 in-process that pushes down, sliding space's volume reduces, gas in the sliding space flows out through gas flow channel, because gas flow channel's aperture is less than sliding space's aperture, and be equipped with curved second air flue 706, consequently, gas receives the resistance at outside exhaust in-process, make inner tube 2 slowly fall, the tremble has been alleviateed, further improve process stability and security.
In a specific embodiment, as shown in fig. 1, a second locking mechanism 9 is disposed at an opposite end of the inner cylinder 2 and the guide rod mechanism 7, as shown in fig. 4, the second locking mechanism 9 includes an insertion portion 910 disposed at one end to be locked and a locking portion 920 disposed at the other end to be locked, in this embodiment, the insertion portion 910 is disposed at a lower end surface of the inner cylinder 2, the locking portion 920 is disposed at an upper end surface of the guide rod mechanism 7, and four second locking mechanisms 9 are circumferentially disposed at equal intervals;
the insertion part 910 comprises a second base 9101, a cylinder 9102 is arranged below the second base 9101, a center hole 9103 is formed in the center of the cylinder 9102, a step hole 9104 with a radially decreasing aperture is formed in the side wall of the cylinder 9102, a ball rod 9105 is arranged in the step hole 9104, the ball rod 9105 comprises a ball head part, a fourth spring and a rod part which are sequentially connected and fixed, the ball head part can slide in a large aperture section of the step hole 9104, the rod part can slide in a small aperture section of the step hole 9104, one end of the third spring 9106 is fixed in the large aperture section, the other end of the third spring 9106 is connected with the ball head part, and the ball head part extends into the center hole 9103 and the rod part is accommodated in the step hole 9104 under the natural extension state of the third spring 9106 and the fourth spring;
the locking part 920 comprises a step groove 9201 corresponding to the second base 9101 and the cylinder 9102, a slot 9202 corresponding to the ball-head rod 9105 is arranged on the side wall of the step groove 9201, a threaded rod 9203 is arranged at the center of the bottom of the step groove 9201, the upper end of the threaded rod 9203 is a spherical surface, the lower end of the threaded rod 9203 is in threaded connection and penetrates through the other end to be locked to be connected with a knob 9204,
after the insertion portion 910 is completely inserted into the locking portion 920, the threaded rod 9203 is inserted into the central hole 9103 and pushes the ball rod 9105 to be inserted into the insertion slot 9202, so that locking is completed. Preferably, an O-ring (not shown) is disposed on the outer side wall of the second base 9101.
Among the above-mentioned technical scheme, inner tube 2 pushes down to guide arm mechanism 7's up end, and cylinder 9102 inserts in step groove 9201, and threaded rod 9203 inserts in centre bore 9103, under the extrusion of threaded rod 9203, in the pole portion of bulb pole 9105 inserts slot 9202, forms the lock-out state, and the firm locking of inner tube 2 this moment is on guide arm mechanism 7, when salvaging, and inner tube 2 and guide arm mechanism 7 can be fished out simultaneously, have further improved work efficiency.
After the accessory is fished out, when the inner cylinder 2 and the guide rod mechanism 7 need to be unlocked, only the knob 9204 needs to be rotated, the threaded rod 9203 moves downwards, and the ball head rod 9105 is released from the slot 9202 under the resilience force action of the third spring 9106 and the fourth spring, so that the locking state is released.
In a specific embodiment, an opening plug seat 204 is arranged at the lower end of the inner side wall of the inner cylinder 2, as shown in fig. 5 and 6, an opening plug 10 is seated on the opening plug seat 204, a sealing structure 11 is arranged on the opening plug 10, the sealing structure 11 includes a groove 1101 arranged on the upper end surface of the body to be sealed and an elastic sealing ring groove 1102 circumferentially arranged on the outer side wall of the body to be sealed, a third through hole 1103 communicated with the groove 1101 is arranged on the elastic sealing ring groove 1102, an elastic sealing ring 1104 is sleeved in the elastic sealing ring groove 1102, an annular cavity is arranged inside the elastic sealing ring 1104, a connecting pipe 1105 communicated with the annular cavity is arranged on the inner side wall, and the connecting pipe 1105 is fixed in the third through hole 1103.
In the above technical scheme, when the pressure is being held, the high-pressure fluid enters the groove 1101, and is filled into the annular cavity inside the elastic sealing ring 1104 through the connecting pipe 1105, and the elastic sealing ring 1104 expands to tightly abut against the inner side wall of the inner cylinder 2, thereby further improving the sealing effect.
In a specific embodiment, as shown in fig. 1, 8 to 10, a closing plug seat 205 is provided at an upper end of the inner cylinder 2, a closing plug 12 is seated on the closing plug seat 205, the second locking mechanism 9 is provided at an end of the closing plug 12 opposite to the inner cylinder 2, the closing plug 12 is provided with the sealing structure 11, a groove 1101 of the sealing structure 11 is provided with an internal thread, and an overshot is in threaded connection with the groove 1101.
In the above technical solution, the locking between the inner cylinder 2 and the closing plug 12 is realized by the second locking mechanism 9, and the efficient sealing between the closing plug 12 and the inner cylinder 2 is realized by the sealing structure 11. After the stage cementing is finished, the closing plug 12 is fixedly connected with the screw thread of the closing plug 12 through a fisher (not shown in the figure) with screw thread, and when the fisher is lifted up, the closing plug 12, the inner cylinder 2, the opening plug 10 and the guide rod mechanism 7 can be fished out of the shaft at the same time, so that the working efficiency is further improved.
In one embodiment, a method of using a drill-plug free stage cementing apparatus is provided, comprising the steps of:
step S100, primary cementing: in the initial state of the drilling-plug-free stage cementing device, the first locking mechanism 8 locks and closes the sliding sleeve 5 and opens the sliding sleeve 6, the circulating hole formed by the first through hole 101 and the second through hole 201 is closed, and cement is injected into the annulus of the well section at the downstream of the drilling-plug-free stage cementing device;
step S200, opening a circulation hole: the opening plug 10 is put into the opening plug seat 204, after the opening plug 10 is seated on the opening plug seat, pressure is suppressed in the oil pipe, under the action of pressure, the opening plug 10 drives the inner barrel 2 and the opening sliding sleeve 6 to slide downwards, the first locking mechanism 8 on the closing sliding sleeve 5 and the opening sliding sleeve 6 is opened, a gap is generated between the opening sliding sleeve 6 and the closing sliding sleeve 5, the opening sliding sleeve 6 slides downwards to the lower joint 3 and is locked on the lower joint 3 through the first locking mechanism 8, and at the moment, the second through hole 201 on the inner barrel 2 is aligned with the first through hole 101 on the outer barrel 1 to form a communicated circulating hole;
step S300, secondary cementing: performing circulating well flushing through the circulating hole, and then injecting cement into a well section annular space on the upstream of the drilling plug-free stage cementing device through the circulating hole;
step S400, closing the circulation hole: a closing plug 12 is put in, after the closing plug 12 is locked by a second locking mechanism 9 and is seated on a closing plug seat 205, pressure is suppressed in the oil pipe, under the action of pressure, the closing plug 12 drives the inner cylinder 2 to continuously slide downwards, a first shear pin 501 on the closing sliding sleeve 5 and a second shear pin 601 on the opening sliding sleeve 6 are cut off, the closing sliding sleeve 5 slides downwards to the upper end face of the opening sliding sleeve 6 and is locked again with the opening sliding sleeve 6 by a first locking mechanism 8, at the moment, the inner cylinder 2 and the guide rod mechanism 7 are locked by the second locking mechanism 9, and the circulation hole is closed;
step S500, unlocking the inner barrel 2: continuing to suppress pressure in the oil pipe, shearing off the third shear pin 203 on the inner cylinder 2 and the fourth shear pin 701 on the guide rod mechanism 7 under the action of pressure, sliding down the inner cylinder 2, and stopping sliding down after the first sliding block 2103 of the radial telescopic mechanism 210 on the inner cylinder 2 slides to the lower end face of the second sliding groove 602;
step S600, salvaging accessories: after the fisher is fixedly connected with the closing plug 12 through threads, the closing plug 12 is lifted upwards, and the closing plug 12, the inner cylinder 2 and the guide rod mechanism 7 which are sequentially locked and connected and the opening plug 10 which is sealed in the inner cylinder 2 are smoothly taken out.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (9)
1. A drill-plug-free stage cementing device, which comprises an outer cylinder (1) and an inner cylinder (2), it is characterized in that the side wall of the outer cylinder (1) is provided with a first through hole (101), the lower end is provided with a lower joint (3), the side wall of the inner cylinder (2) is provided with a second through hole (201), a closing sliding sleeve (5) and an opening sliding sleeve (6) are arranged between the outer cylinder (1) and the inner cylinder (2) from top to bottom, the inner cylinder (2) controls the closing sliding sleeve (5) and the opening sliding sleeve (6) to axially slide, a circulating hole for cementing is opened or closed, a guide sliding groove (202) is axially arranged on the lower end surface of the inner cylinder (2), a guide rod mechanism (7) corresponding to the guide chute (202) is fixed on the inner side wall of the lower joint (3) through a fourth shear pin (701), and the inner cylinder (2) and the guide rod mechanism (7) can be fished out of a shaft;
the closing sliding sleeve (5) is fixed on the inner side wall of the outer barrel (1) through a first shear pin (501), a first sliding groove (502) is axially formed in the inner side wall of the closing sliding sleeve (5), a third shear pin (203) capable of sliding in the first sliding groove (502) is arranged on the outer side wall of the inner barrel (2), the opening sliding sleeve (6) is fixed on the outer side wall of the inner barrel (2) through a second shear pin (601), a second sliding groove (602) is axially formed in the inner side wall of the opening sliding sleeve (6), and a radial telescopic mechanism (210) capable of sliding in the second sliding groove (602) is arranged on the outer side wall of the inner barrel (2);
a second locking mechanism (9) is arranged at one end of the inner cylinder (2) opposite to the guide rod mechanism (7),
the upper end of the inner cylinder (2) is provided with a closing plug seat (205), a closing plug (12) is seated on the closing plug seat (205), and the second locking mechanism (9) is arranged at one end, opposite to the inner cylinder (2), of the closing plug (12).
2. The drill-plug-free stage cementing device according to claim 1, wherein the radial telescopic mechanism (210) comprises a radially arranged third runner (2101) and a fourth runner (2105) communicating therewith, a first spring (2102) and a first sliding block (2103) are arranged in the third sliding groove (2101), a second spring (2106) and a second sliding block (2107) are arranged in the fourth sliding chute (2105), the first sliding block (2103) is provided with a first embedded groove (2104) corresponding to the second sliding block (2107), and in an initial state, the first spring (2102) naturally extends, the first sliding block (2103) is respectively abutted against the upper end surface of the second sliding chute (602) and the second sliding block (2107), and the two abutted parts are inclined planes, the second slider (2107) is inserted into the first fitting groove (2104) in a state where the second spring (2106) is naturally extended.
3. The drill-plug-free stage cementing device according to claim 2, characterized in that the ends of the closing sliding sleeve (5) opposite to the opening sliding sleeve (6) and the ends of the opening sliding sleeve (6) opposite to the lower joint (3) are respectively provided with a first locking mechanism (8).
4. The drill-plug-free stage cementing device according to claim 3, wherein a gas flow passage is arranged in the guide rod mechanism (7), one end of the gas flow passage is communicated with the guide chute (202), and the other end of the gas flow passage is communicated with the outside.
5. The drill-plug-free stage cementing device according to claim 4, characterized in that the second locking mechanism (9) comprises an insertion part (910) arranged at one end to be locked and a locking part (920) arranged at the other end to be locked, and when the insertion part (910) is fully inserted into the locking part (920), automatic locking can be realized.
6. The drill-free cementing device for the stage of the water injection according to the claim 5, characterized in that the lower end of the inner side wall of the inner cylinder (2) is provided with an opening plug seat (204), an opening plug (10) is seated on the opening plug seat (204), and the opening plug (10) is provided with a sealing structure (11).
7. The drilling-plug-free stage cementing device according to claim 6, wherein the sealing structure (11) comprises a groove (1101) arranged on the upper end surface of the body to be sealed and an elastic sealing ring groove (1102) circumferentially arranged on the outer side wall of the body to be sealed, a third through hole (1103) communicated with the groove (1101) is arranged on the elastic sealing ring groove (1102), an elastic sealing ring (1104) is sleeved in the elastic sealing ring groove (1102), an annular cavity is arranged inside the elastic sealing ring (1104), a connecting pipe (1105) communicated with the annular cavity is arranged on the inner side wall of the elastic sealing ring (1104), and the connecting pipe (1105) is fixed in the third through hole (1103).
8. The drill-free cementing device according to the claim 7, characterized in that the closing plug (12) is provided with the sealing structure (11), the sealing structure (11) is provided with an internal thread in the groove (1101), and the fisher is connected with the groove (1101) by screw thread.
9. The method of using a drill-plug free stage cementing device according to claim 8, characterized by the steps of:
step S100, primary cementing: under the initial state of the drilling-plug-free stage cementing device, a first locking mechanism (8) locks and closes a sliding sleeve (5) and opens a sliding sleeve (6), a circulating hole formed by a first through hole (101) and a second through hole (201) is closed, and cement is injected into a well section annular space at the downstream of the drilling-plug-free stage cementing device;
step S200, opening a circulation hole: the opening plug (10) is put into the opening plug seat, after the opening plug (10) is seated on the opening plug seat (204), pressure is suppressed in the oil pipe, the opening plug (10) drives the inner barrel (2) and the opening sliding sleeve (6) to slide downwards under the action of pressure, the first locking mechanism (8) on the closing sliding sleeve (5) and the opening sliding sleeve (6) is opened, a gap is formed between the opening sliding sleeve (6) and the closing sliding sleeve (5), the opening sliding sleeve (6) slides downwards to the lower joint (3) and is locked on the lower joint (3) through the first locking mechanism (8), and at the moment, a second through hole (201) in the inner barrel (2) is aligned with a first through hole (101) in the outer barrel (1) to form a communicated circulating hole;
step S300, secondary cementing: performing circulating well flushing through the circulating hole, and then injecting cement into a well section annular space on the upstream of the drilling plug-free stage cementing device through the circulating hole;
step S400, closing the circulation hole: a closing plug (12) is put in, when the closing plug (12) is locked by a second locking mechanism (9) and sealed in a closing plug seat (205), pressure is build up in the oil pipe, the closing plug (12) drives the inner cylinder (2) to continuously slide downwards under the action of pressure, a first shear pin (501) on the closing sliding sleeve (5) and a second shear pin (601) on the opening sliding sleeve (6) are sheared, the closing sliding sleeve (5) slides downwards to the upper end face of the opening sliding sleeve (6), and is locked with the opening sliding sleeve (6) again through a first locking mechanism (8), at the moment, the inner cylinder (2) and the guide rod mechanism (7) are locked by the second locking mechanism (9), and the circulation hole is closed;
step S500, unlocking the inner cylinder (2): continuing suppressing pressure in the oil pipe, shearing off a third shear pin (203) on the inner cylinder (2) and a fourth shear pin (701) on the guide rod mechanism (7) under the action of pressure, sliding down the inner cylinder (2), and stopping sliding down after a first sliding block (2103) of a radial telescopic mechanism (210) on the inner cylinder (2) slides to the lower end face of a second sliding groove (602);
step S600, salvaging accessories: after the fisher is fixedly connected with the closing plug (12) through threads, the closing plug (12) is lifted up, and the closing plug (12), the inner cylinder (2) and the guide rod mechanism (7) which are sequentially locked and connected and the opening plug (10) which is sealed in the inner cylinder (2) are smoothly taken out.
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| CN202111586702.9A CN113982530B (en) | 2021-12-23 | 2021-12-23 | Drilling-plug-free stage cementing device and using method thereof |
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| CN202111586702.9A CN113982530B (en) | 2021-12-23 | 2021-12-23 | Drilling-plug-free stage cementing device and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114753801A (en) * | 2022-04-08 | 2022-07-15 | 中国石油化工股份有限公司 | Cementing plug slide valve and cementing plug tubular column |
| CN116220609B (en) * | 2023-01-13 | 2023-08-22 | 青岛鑫源晟石油科技有限公司 | Conventional well cementing rubber plug for horizontal well high-inclination well |
| CN117780299B (en) * | 2024-02-27 | 2024-04-30 | 河北上善石油机械有限公司 | Claw sleeve type stage cementing device |
| CN117780300B (en) * | 2024-02-27 | 2024-04-30 | 河北上善石油机械有限公司 | Drilling-free stage cementing device |
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Denomination of invention: A graded cementing device without drilling plug and its usage method Granted publication date: 20220304 Pledgee: Dongying Branch of China CITIC Bank Co.,Ltd. Pledgor: Weida Petroleum Equipment Co.,Ltd. Registration number: Y2024980005679 |
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