CN115434657A - Skeleton type telescopic sealing device, packer and application - Google Patents
Skeleton type telescopic sealing device, packer and application Download PDFInfo
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- CN115434657A CN115434657A CN202211205398.3A CN202211205398A CN115434657A CN 115434657 A CN115434657 A CN 115434657A CN 202211205398 A CN202211205398 A CN 202211205398A CN 115434657 A CN115434657 A CN 115434657A
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- telescopic sealing
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Classifications
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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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
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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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
Abstract
The invention provides a framework type telescopic sealing device, a packer and application. The framework type telescopic sealing device can comprise a rubber cylinder and a supporting framework; the supporting framework is internally arranged in the wall of the rubber cylinder or externally arranged in the cavity of the rubber cylinder, and can generate radial expansion when being compressed axially, so that the rubber cylinder expands outwards. The packer may comprise a skeletal telescoping seal arrangement as described above. The applications shown include applications in isolation while drilling and reverse circulation drilling. The beneficial effects of the invention include: the method can realize the dynamic packing of the borehole annulus according to the requirement by adopting the modes of pressurization expansion and drill lifting shrinkage; the rubber cylinder can well realize annular space packing and prevent blocking; the expanded outer diameter of the rubber cylinder can be accurately controlled; the rubber cylinder is of a framework type, the structural strength of the rubber cylinder is high, and controllable large deformation can be realized; the invention can realize packing while drilling in the drilling process.
Description
Technical Field
The invention relates to the technical field of drilling engineering, which is mainly used in the fields of reverse circulation rock drilling such as petroleum and natural gas drilling, geological mineral products, mine rescue and the like, in particular to a framework type telescopic sealing device, a packer and application.
Background
Along with further attention on energy safety of China, the number of unconventional oil and gas resource exploration and deep well and ultra-deep well in China is increasing. On one hand, the surface well bore is increasingly large and deep in size; on the other hand, loss of formation fluid causes different levels of environmental pollution, and also increases the drilling cycle due to other complications caused by lost circulation. This not only results in higher overall costs for surface drilling, but also in environmental problems that are not negligible in some areas. Therefore, reverse circulation drilling is always the focus of the industry for pursuing and popularizing. In addition, domestic unconventional oil and gas exploration and development strength is continuously increased, benefit development requirements are continuously improved, the number and horizontal section length of horizontal wells are remarkably increased, and the problem of narrow pressure windows and the problem of well bore purification in the drilling process of the horizontal wells are more and more prominent. The double-wall reverse circulation well drilling has the advantages that the circulation medium only circulates in the drilling tool pipe, so that the fluctuation of the ECD at the bottom of the well can be effectively avoided, the annular pressure gradient is kept stable, the rock carrying capacity of the circulation medium is improved, and the drilling of a narrow density window and the extension of the length of a horizontal section are facilitated.
Reverse circulation drilling techniques, which employ a unique double-wall drilling tool system, return drilling fluid and cuttings to the surface through the inner tubular passage of the double-wall drilling tool, have significant advantages over conventional forward circulation: no erosion is caused to the well wall, so that the instability of the erosion property of the well wall can be avoided, and particularly when large discharge circulation is performed; the circulating medium (gas and slurry) and ground equipment can be greatly saved, so that the energy consumption and the cost are reduced, and the occupied area of a field is reduced; the sand discharge efficiency is high, the shaft bottom is clean and has no sand setting, the well leakage can be effectively treated, on one hand, the comprehensive cost caused by the complex well leakage is reduced, and the additional drilling period caused by the complex well leakage is also shortened; on the other hand, the problem of environmental protection caused by complex lost circulation is solved.
The reverse circulation well drilling adopts a unique concentric double-pipe drilling tool (double-wall drilling tool), and the key point of the smooth reverse circulation well drilling is how well drilling fluid (containing rock debris) at the bottom of a well smoothly enters a channel in the drilling tool and returns to the surface. And forced circulation implemented by annular packing is one of the means for establishing reverse circulation.
There is a local reverse circulation process (CN 108756828B, CN110029938A, CN111021958 a) using a cross joint to implement "reverse circulation + forward circulation". The core of the method is that an annular packer (CN 113863879A) and a cross joint are arranged at a position close to a drill bit (or close to the bottom of a well) in the well, and a combined mode of a double-wall drilling tool, the annular packer, the cross joint, a conventional single-wall drilling tool and a conventional positive circulation drill bit is adopted. The drilling fluid is sprayed out through a drill bit nozzle, enters the shaft annulus, is carried with rocks and returns upwards in a conventional positive circulation mode, and is forced to enter the inner pipe channel of the double-wall drilling tool through the cross joint and return to the ground surface under the combined action of the annulus pressurized fluid (gas or liquid) and the annulus packer. The method originates from the central sampling technique (CSR) of the geological industry. There are several patents related to oil drilling, which are mostly used for mud drilling, and only the CN110029938a patent mentions the use of gas drilling, but the method has the following irremediable problems: (1) the cross-sectional area of the borehole annulus is larger than the cross-sectional area of the inner pipe passage of the double-wall drilling tool, that is, the passage through which the downhole fluid is normally circulated in the borehole annulus is larger than the passage through which the downhole fluid enters the inner pipe of the double-wall drilling tool after passing through the cross joint, and the cross joint inevitably plays a role in significant throttling (the circulation passage is changed from small to large and then from large to small), so that the injection pressure of ground equipment is increased. Particularly large-sized wellbores. Even if gas circulation is adopted, very high circulation resistance is brought if the water flows out of the stratum; (2) according to the method, gas or liquid is injected into the shaft annulus, circulation can be effectively established under the combined action of annulus packing, and when stratum leakage occurs, the circulation is easy to lose efficacy; (3) the annular packer is almost equivalent to the well diameter, so that the drill sticking is easy to cause; (4) the rigidity of a sealing rubber ring of the annular packer is poor, the annular packer cannot be independently used for sealing the annular, gas or liquid is injected into the annular, and circulation can be established under the combined action of the gas and the liquid, but the defect is that the circulation cannot be established.
The invention patent application with the publication number of CN113863888A discloses an expansion type annular packing device which is mainly used for underground blowout prevention. And when well control risks occur, the bit pressure is increased, the outer rubber tube is compressed after the inner pin is cut off, and the annular space is sealed after the rubber tube is expanded. And after the rubber cylinder expands, the compression stroke is locked. The device is only when well control risk appears the packing element expansion, can't accomplish to follow the drilling and seal the annular space, consequently can't be used to the well drilling in-process. In addition, the device realizes annular sealing after directly compressing the rubber sleeve to deform and expand the rubber sleeve, and is feasible in the case of small annular gap (a downhole rubber packer is common). However, for reverse circulation drilling with a slightly larger borehole size, the borehole annulus is larger (for a 445mm borehole diameter, if drilling is performed with a 330mm diameter air hammer, the single-sided gap of the annulus is 57.5 mm). If the mode of directly compressing the rubber cylinder is adopted, firstly, the rubber cylinder is easily torn because of the large deformation generated by direct compression; secondly, there is not structural strength, in case the annular space is some pressure just can take place the upset, can't effectively seal the annular space. Moreover, with such a large gap, the rubber deforms uncontrollably and freely under direct compression, does not expand completely, and may partially bulge out and partially collapse into the other, which may also lead to seal failure. Therefore, the device described by the invention can be used as a well control tool with a small annular space and cannot be used for a reverse circulation dynamic isolation-while-drilling tool (particularly a well with a slightly larger borehole).
In summary, the prior art has the following main problems: expansion and contraction as required cannot be achieved; the drill sticking accident is easy to happen; the structural strength of the packing rubber cylinder is not enough; controllable large deformation cannot be realized; packing while drilling cannot be achieved in the drilling process.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the objects of the present invention is to achieve expansion and contraction of the rubber tube as required.
In order to achieve the above object, an aspect of the present invention provides a skeleton-type telescopic sealing device.
The device can comprise a rubber cylinder and a supporting framework; the supporting framework is internally arranged in the wall of the rubber cylinder or externally arranged in the cavity of the rubber cylinder, and can generate radial expansion when being compressed axially, so that the rubber cylinder expands outwards.
Alternatively, the apparatus shown may be used in re-circulation drilling.
Optionally, the device further comprises a first rubber cylinder seat and a second rubber cylinder seat, wherein the first rubber cylinder seat and the second rubber cylinder seat are mutually faced and are separated by a certain distance, and the distance forms a compression stroke; one end of the rubber cylinder is sleeved on the first rubber cylinder seat and connected with the first rubber cylinder seat, and the other end of the rubber cylinder is sleeved on the second rubber cylinder seat and connected with the second rubber cylinder seat; the supporting framework is arranged in a space surrounded by the rubber sleeve, the first rubber sleeve seat and the second rubber sleeve seat.
Optionally, the support framework is located in the cavity of the rubber cylinder and comprises a plurality of groups of connecting rod assemblies arranged around the central axis of the rubber cylinder, each group of connecting rod assemblies comprises a first connecting rod, a second connecting rod and a connecting piece, wherein one end of the first connecting rod is hinged to the first rubber cylinder base, one end of the second connecting rod is hinged to the second rubber cylinder base, and the other end of the first connecting rod is hinged to the other end of the second connecting rod through the connecting piece.
Alternatively, both the other end of the first link and the other end of the second link may have a pre-bent structure protruding outward.
Optionally, the first rubber sleeve seat may include a first axial section, a second axial section and a third axial section which are connected in sequence and have successively reduced thicknesses; the second rubber cylinder seat can comprise a fourth axial section, a fifth axial section and a sixth axial section which are sequentially connected and have sequentially reduced thicknesses; the end surfaces of the third axial section and the sixth axial section face each other; two ends of the rubber cylinder are respectively connected to the first axial section and the fourth axial section; one end of the first connecting rod is hinged to the second axial section; one end of the second connecting rod is hinged to the fifth axial section.
Alternatively, both the first axial segment and the fourth axial segment may have one annular protrusion, and both annular protrusions are used for connecting the glue cartridge. Further, the direction of the annular protrusion may be axial, and the two annular protrusions may face each other.
Optionally, the inner surfaces of the first, second and third axial segments are on the same curved surface; the inner surfaces of the fourth, fifth and sixth axial segments are on the same curved surface.
Optionally, the rubber sleeve further comprises a first limiting sleeve, a second limiting sleeve, a first rubber sleeve seat and a second rubber sleeve seat; the first limiting sleeve and the second limiting sleeve face each other and are separated by a first distance, and the first distance forms a compression stroke; the first rubber cylinder seat and the second rubber cylinder seat are respectively sleeved on the first limiting sleeve and the second limiting sleeve, a second distance is arranged between the first limiting sleeve and the second limiting sleeve, and the second distance is smaller than the first distance; the rubber sleeve is sleeved on the first limiting sleeve and the second limiting sleeve, one end of the rubber sleeve is connected with the first rubber sleeve base, and the other end of the rubber sleeve is connected with the second rubber sleeve base.
Optionally, the supporting framework is arranged in a space surrounded by the rubber cylinder and the first and second limiting sleeves and comprises a plurality of steel sheets arranged around the central axis of the rubber cylinder, the steel sheets are arc-shaped steel sheets with outward protruding directions, and two ends of each steel sheet are respectively connected with the first and second limiting sleeves.
Optionally, the device may further include a first blocking ring and a second blocking ring, one end of the first blocking ring and one end of the first rubber cylinder base together form a flat bearing end, and one end of the second blocking ring and one end of the second rubber cylinder base together form a flat bearing end.
Optionally, the support frame is built in the wall of the rubber tube and comprises an elastic steel wire frame, and the elastic steel wire frame is provided with a pre-bending structure protruding outwards.
Alternatively, the device achieves dynamic packing of the wellbore annulus by means of pressurized expansion and lift-off contraction.
In another aspect, the present invention provides a packer.
The packer comprises the framework type telescopic sealing device.
The invention also provides application of the packer.
The applications shown may include the use of a skeletal telescoping seal as described above in pack-off while drilling. The illustrated application may also include the use of a skeletal telescoping seal arrangement as described above in reverse circulation drilling.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
(1) The method can realize the dynamic packing of the borehole annulus as required by adopting the modes of pressurization expansion and drill lifting contraction. Even if the borehole wall is unstable and falls into blocks, the borehole jamming accident does not need to be worried about.
(2) The framework type telescopic sealing device can well realize annular space packing.
(3) The expansion outer diameter of the rubber cylinder can be accurately controlled, namely the compression amount of the rubber cylinder after being limited by the well wall can be controlled.
(4) The framework type rubber cylinder is adopted, the structural strength of the rubber cylinder is high, and controllable large deformation can be realized.
(5) The framework type telescopic sealing device can realize dynamic telescopic, and avoids drill jamming; and the device has a framework, namely structural strength, and can bear higher annular packing pressure than a conventional packer.
(6) The invention can realize packing while drilling in the drilling process.
Drawings
The above and other objects and/or features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view showing a structure of a skeleton type telescopic sealing device in an exemplary embodiment 1 of the present invention;
fig. 2 is a schematic structural view showing a first cartridge holder according to exemplary embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a structure of a skeleton type telescopic sealing device in an exemplary embodiment 2 of the present invention;
FIG. 4 is a schematic view showing the structure of the skeleton-type telescopic sealing device according to exemplary embodiment 3 of the present invention;
fig. 5 shows a schematic view of a radial cross-section C-C in fig. 4.
Description of the main reference numerals:
1-a first rubber cylinder seat, 11 a-an annular bulge;
2-a second rubber cylinder seat;
3-a rubber cylinder;
41-a first connecting rod, 42-a second connecting rod, 43-a connecting piece, 44-a steel sheet and 45-an elastic steel wire framework;
5-a first stop collar;
6-a second stop collar;
7-a first baffle ring;
8-a second baffle ring;
a-compression stroke.
Detailed Description
Hereinafter, the skeletal telescoping seal arrangement, packer and application of the present invention will be described in detail in connection with exemplary embodiments.
It should be noted that "first", "second", "third", "fourth", etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and the like are used for convenience in describing and configuring relative orientations or positional relationships, and do not indicate or imply that the referenced components must have the particular orientation or position.
Fig. 1 shows a schematic view of the structure of the skeletal telescopic sealing device of the present invention. Fig. 2 shows a schematic structural diagram of the first glue cartridge holder. The present exemplary embodiment is explained below with reference to fig. 1 and 2.
The device can comprise a first rubber cylinder base 1, a second rubber cylinder base 2, a rubber cylinder 3 and a supporting framework as shown in figure 1.
The first and second rubber cylinder bases are spaced at a certain distance from each other, and the distance forms a compression stroke A.
The first rubber cylinder base 1 and the second rubber cylinder base 2 are respectively inserted into two openings of the rubber cylinder 3 and are connected with each other.
The supporting framework is externally arranged in the inner cavity of the rubber cylinder 3, and two ends of the supporting framework are respectively arranged on the first rubber cylinder base 1 and the second rubber cylinder base 2. Under compression, the supporting framework will bear against the inner wall of the glue cartridge 3 and expand radially outwards, thereby expanding the glue cartridge 3. After expansion of the sleeve 3, if the supporting framework is stretched, it will contract radially inwards, thereby contracting the sleeve 3.
In the present embodiment, the first rubber cartridge holder 1 may include a first axial section 11, a second axial section 12 and a third axial section 13 which are connected in sequence and have successively reduced thicknesses as shown in fig. 2.
As shown in fig. 1 and 2, one end of the glue cartridge 3 may be attached to the first axial section 11. Further, the first axial segment 11 may be provided with an annular protrusion 11a for connecting the glue cartridge 3.
The shape and structure of the second glue cylinder holder 2 may be the same as the first glue cylinder holder 1, for example, the second glue cylinder holder includes a fourth axial section, a fifth axial section and a sixth axial section which are connected in sequence and whose thickness is reduced in sequence. Wherein the fourth, fifth and sixth axial segments correspond to the first, second and third axial segments, respectively. The end faces of the third and sixth axial segments face each other.
In the present embodiment, as shown in fig. 1, both the first and second rubber cylinder holders 1 and 2 may be symmetrically disposed. The first rubber cylinder base 1 and the second rubber cylinder base 2 both have axially through cavities, and the central axes of the two cavities can be coaxial with the central axis of the rubber cylinder.
In this embodiment, the supporting frame may be an external connecting rod frame, which may include a plurality of sets of connecting rod assemblies disposed around the central axis of the rubber cylinder. The linkage assembly may include a first link 41, a second link 42, and a link 43 as shown in FIG. 1. Alternatively, the number of connecting rod assemblies may be 10 to 50, such as 20, 30, 36, 40, etc.
One end of the first link 41 is hinged to the first rubber cylinder holder 1, which can be hinged to the end face of the second axial section 12.
One end of the second connecting rod 42 is hinged with the second rubber cylinder base 2, and it can be hinged on the end surface of the fifth axial segment.
The other end of the first link 41 and the other end of the second link 42 are hinged by a connecting member 43.
The connecting member 43 may include a pin, but the present invention is not limited thereto, and may be other connecting members capable of realizing hinge.
Further, as shown in fig. 1, the second ends of the first link 41 and the second link 42 may have an outwardly convex pre-bent arc structure, so that it is ensured that the support frame is outwardly convex rather than inwardly concave when pressed. When the first and second rubber cylinder holders are compressed, the connecting rod assembly projects outwards under the limit of the connecting member (e.g. pin), thereby forcing the rubber cylinder 3 to deform in accordance with the expanded shape of the connecting member. When the first and second rubber cylinder bases are stretched, the connecting rod assembly is also stretched, and the rubber cylinder 3 is restored to the original shape.
In this embodiment, a plurality of protruding structures are arranged on the circumferential outer wall of the rubber cylinder supported by the supporting framework, and the protruding structures are used for increasing the expanded outer diameter; at the same time, the contact area can be reduced, thereby reducing friction. As an alternative to the present invention, the projection structure may be an annular projection.
Fig. 3 shows another structural schematic diagram of the skeleton-type telescopic sealing device of the present invention. The present exemplary embodiment is explained below with reference to fig. 3.
The device can comprise a first rubber cylinder base 1, a second rubber cylinder base 2, a rubber cylinder 3, a first limiting sleeve 5, a second limiting sleeve 6 and a supporting framework as shown in figure 3.
The first and second stop collars face each other and the distance between the first and second stop collars forms a compression stroke A.
The first rubber cylinder seat 1 is sleeved at one end of the first limiting sleeve 5 and fixedly connected with the first limiting sleeve. The second rubber cylinder seat 2 is sleeved at one end of the second limiting sleeve 6, and the second rubber cylinder seat and the second limiting sleeve are fixedly connected. The distance between the first rubber cylinder seat and the second rubber cylinder seat is less than the compression stroke A.
The rubber cylinder 3 is sleeved on the first limiting sleeve 5 and the second limiting sleeve 6, one end of the rubber cylinder is connected with the first rubber cylinder base 1, and the other end of the rubber cylinder is connected with the second rubber cylinder base 2.
The supporting framework can be an external steel sheet framework.
In the present embodiment, the shape and structure of the first and second rubber cylinder holders 1, 2 may be different from those in exemplary embodiment 1. In contrast, the axial dimension of the cartridge holder in the present exemplary embodiment is smaller than that in exemplary embodiment 1.
Further, as shown in fig. 3, both of the rubber tube holders may be provided with an annular protrusion for connection with the rubber tube 3. The annular protrusions on the two rubber cylinder seats can face each other.
In this embodiment, the supporting frame is disposed in a space surrounded by the inner wall of the rubber cylinder 3 and the outer walls of the first and second position-limiting sleeves.
In this embodiment, the first and second stop collars 5 and 6 both have axially through cavities, and the central axes of the cavities may be coaxial with the central axis of the rubber cylinder.
As shown in fig. 3, the supporting framework may include a plurality of steel plates 44 disposed around the central axis of the rubber cylinder, and the steel plates 44 are arc-shaped steel plates with the convex direction facing outwards, so that the supporting framework is ensured to deform convexly outwards rather than concavely inwards when being pressed. The two ends of the steel sheet 44 are respectively connected with the first and second limiting sleeves. The number of sheets can be set according to the weight on bit required to be pressed open. The steel sheets can be uniformly arranged along 360 degrees, and the distance is determined according to the number of the steel sheets. The steel sheet can be spring steel. In fig. 3, the transverse line between the first stop collar 5 and the second stop collar 6 represents the steel sheet, and the longitudinal line is a contour line (there is no tangential smooth transition, so there is a longitudinal line).
In this embodiment, as shown in fig. 3, the device further includes a first retaining ring 7 and a second retaining ring 8, and the two retaining rings mainly function as: respectively forms a flat bearing end face (plane) with the first rubber cylinder seat 1 and the second rubber cylinder seat 2. The first retaining ring 7 and the second retaining ring 8 can also be respectively connected with the first rubber cylinder base 1 and the second rubber cylinder base 2 in a detachable connection mode, such as threaded connection, snap spring connection or pin penetration. The first retaining ring 7 and the second retaining ring 8 can be respectively connected with the first limiting sleeve 5 and the second limiting sleeve 6 in a threaded connection mode or other modes which are convenient to detach.
The invention can change the first stop collar 5 and/or the second stop collar 6 with different lengths to adjust the length of the compression stroke A, thereby controlling the maximum compression stroke, namely the maximum expansion outer diameter.
As an embodiment of the present invention, the first stopper ring 7 and the first stop collar 5 may be separate bodies, so that the first stop collar 5 may be easily replaced. As another embodiment of the present invention, the first stopper ring 7 and the first position restricting sleeve 5 may be integrated, in which case the stroke adjustment should be performed as a whole.
As an embodiment of the present invention, the second retainer ring 8 and the second position-limiting sleeve 6 may be separated, so that the second position-limiting sleeve 6 can be conveniently replaced. As another embodiment of the present invention, the second stopper ring 8 and the second stop collar 6 may be integrated, in which case the stroke adjustment needs to be performed as a whole.
In this embodiment, a plurality of protruding structures are arranged on the circumferential outer wall of the rubber cylinder supported by the supporting framework, and the protruding structures are used for increasing the expanded outer diameter; at the same time, the contact area can be reduced, thereby reducing friction. As an alternative to the invention, the projection arrangement may be an annular projection.
Fig. 4 shows another structural schematic diagram of the skeleton-type telescopic sealing device of the present invention. Fig. 5 shows a schematic cross-sectional view C-C in fig. 4. The present exemplary embodiment is described below in conjunction with fig. 4 and 5.
Most of the components of the skeleton-type telescopic sealing device in the present exemplary embodiment may be the same as those in exemplary embodiment 2 except for the difference in the rubber tube and the support skeleton.
Specifically, the device may include a first rubber cylinder base 1, a second rubber cylinder base 2, a rubber cylinder 3, a first limit sleeve 5, a second limit sleeve 6, a first baffle ring 7, a second baffle ring 8, a rubber cylinder 3 and a supporting framework as shown in fig. 4. Wherein, the first rubber cylinder base 1, the second rubber cylinder base 2, the first limit sleeve 5, the second limit sleeve 6, the first baffle ring 7 and the second baffle ring 8 can be respectively the same as the corresponding components in the exemplary embodiment 2.
The supporting framework is arranged in the wall of the rubber tube 3. The support frame may be a built-in resilient wire frame 45 as shown in fig. 5. Two ends of the elastic steel wire framework 45 are respectively connected with the first rubber cylinder seat 1 and the second rubber cylinder seat 2. The resilient wire framework 45 has an outwardly projecting pre-bent configuration which ensures that the support framework deforms convexly outwardly rather than concavely inwardly when under compression.
Furthermore, the elastic steel wire framework can be made of high-elasticity high-quality spring steel. Wherein, the number and the diameter of the spring steel wires can be set according to the bit pressure required by pressing the rubber cylinder open in the drilling process. The spring wires may be uniformly arranged in 360 °.
Furthermore, a plurality of protruding structures are arranged on the circumferential outer wall of the rubber cylinder, which is supported by the supporting framework, and the protruding structures are used for increasing the expanded outer diameter; at the same time, the contact area can be reduced, thereby reducing friction. As an alternative to the invention, the projection arrangement may be an annular projection.
In the above three exemplary embodiments of the present invention, when the cartridge 3 is compressively deformed, the outer diameter of the expansion of the cartridge 3 can be controlled by adjusting the compression stroke a. For example, when applied to drilling, in the case of rotary drilling with bit pressure, the rubber cylinder 3 will be pressed and expanded to press against the well wall, and the expansion of the rubber cylinder 3 is controlled by adjusting the compression stroke a. The expansion outer diameter of the rubber cylinder can be accurately controlled, namely, after the rubber cylinder 3 is subjected to axial pressure, the internal support framework expands outwards under the action of the pressure, the expanded diameter of the internal support framework has a unique corresponding relation with the axial compression stroke A, and the diameter of the framework after being expanded outwards can be accurately controlled through the compression stroke A of the rubber cylinder.
Table 1 shows an exemplary set of test data for the diameter of the compressed cartridge of the present invention versus the weight on bit and compression height. Table 1 shows a set of indoor compression deformation test data of the framework-type telescopic sealing device shown in fig. 1, and the rubber cylinder in the sealing device is a 325mm rubber cylinder (the diameter is 325mm when uncompressed), that is, the series of test data are test data of the 325mm rubber cylinder under different pressures. The compressed height refers to the axial compression size of the rubber cylinder, the compressed maximum diameter refers to the maximum diameter of the compressed rubber cylinder, and the compressed maximum diameter corresponding to the compressed height of 0mm refers to the diameter of the rubber cylinder under the uncompressed condition.
TABLE 1
Exemplary embodiment 4
The exemplary embodiment provides a packer.
The packer may have a skeletal telescoping seal arrangement as described in example embodiments 1, 2 or 3.
The present exemplary embodiment provides an application.
The application comprises the following steps: the application of the skeleton type telescopic sealing device in the exemplary embodiment 1, 2 or 3 in packer while drilling.
While-drilling packing needs to satisfy three important aspects: (1) the risk of sticking the drill cannot be brought by packing; (2) the drilling can be carried out while the packing is carried out; (3) near the drill bit. The invention can meet the requirements of the three aspects. Specifically, the method comprises the following steps: on one hand, a packer provided with the framework type telescopic sealing device is close to a drill bit at the bottom of a well and is positioned above the drill bit; the packer is applied with the bit pressure to open and seal the annular space, and can shrink after the drill is lifted, so that the risk of drill sticking caused by reducing can be effectively avoided. On the other hand, when drilling, the rubber sleeve of the framework type telescopic sealing device opens to seal the annular space, but the rubber sleeve does not rotate along with the high-speed rotation of the drill string but is relatively static, so that the abrasion of the rubber sleeve caused by the high-speed rotation can be effectively avoided, and the sealing effect and the reliability while drilling are improved.
The present exemplary embodiment provides an application.
The application comprises the following steps: use of the skeletal telescoping seal arrangement of exemplary embodiments 1, 2 or 3 in reverse circulation drilling.
The reverse circulation well drilling has the advantages of low energy consumption, leakage prevention and control, no disturbance of the well wall, environmental friendliness and the like because a circulating medium does not enter the well bore annulus due to the unique characteristic of internal circulation of a drilling tool, and can be applied to the well drilling fields of oil and gas well drilling, pile foundation engineering (water conservancy and hydropower, bridges, roads, tunnels, buildings and the like), solid mineral well drilling, mine rescue wells and the like. For the current well drilling, the shallow surface well drilling has great risk of environmental pollution, and by adopting the reverse circulation well drilling technology, all fluids required by the well drilling and rock debris generated in the well drilling process do not contact with the stratum, do not enter the stratum, do not pollute underground water, and do not enter other places along the stratum gap, so the method is a very environment-friendly well drilling method. This is also a significant contribution to the environment of drilling.
In addition, the reverse circulation drilling technology has the following advantages:
(1) the reverse circulation drilling technology can greatly reduce the use of ground equipment, reduce fuel consumption, reduce carbon emission compared with the positive circulation and meet the double-carbon target. (2) The drilling medium only circulates in the drilling tool, so that the use of drilling fluid and clean water is greatly reduced, and water resources are saved. (3) The drilling medium only circulates in the drilling tool, so that substances such as fluid and the like cannot enter the stratum, cannot pollute the stratum and underground water, cannot leak to other places to pollute water sources, is environment-friendly, and accords with the environmental protection policies and regulations of countries, places and group companies.
The framework type telescopic sealing device can be used as a core component in a reverse circulation dynamic packer while drilling, is applied to a reverse circulation drilling technology, meets the requirements of energy conservation, environmental protection and emission reduction on low carbon of national, local and group companies, meets the double carbon target, and can solve the following key technical problems:
(1) dynamic expansion, expansion as required (drilling expansion, drill lifting contraction), and drill jamming is effectively avoided;
(2) the annular sealing structure has an internal framework, has structural strength, and has stronger annular pressure-bearing capacity and better sealing effect;
(3) the inner framework is designed with a pre-bending structure, so that the deformation direction is controllable, and the controllable deformation of the rubber is realized.
In summary, the advantages of the framework type telescopic sealing device, the packer and the application of the invention can include: the invention can realize the dynamic packing of the borehole annulus as required by adopting the modes of pressurization expansion and drill lifting contraction. The rubber cylinder can be used while drilling, can prevent blockage and can simultaneously realize annular space sealing. The expansion outer diameter of the rubber cylinder can be accurately controlled and can be dynamically stretched. The rubber cylinder is of a framework type, has high structural strength and can realize controllable large deformation; the invention can realize packing while drilling in the drilling process. The invention can be applied to the recirculation drilling well, meets the requirements of energy conservation, environmental protection, emission reduction and low carbon of national, local and group companies, and meets the double-carbon target.
Claims (15)
1. A framework type telescopic sealing device is characterized by comprising a rubber cylinder and a supporting framework; the supporting framework is internally arranged in the wall of the rubber cylinder or externally arranged in the cavity of the rubber cylinder, and can generate radial expansion when being compressed axially, so that the rubber cylinder expands outwards.
2. The skeletal telescopic sealing device according to claim 1, further comprising a first rubber cylinder seat and a second rubber cylinder seat, wherein,
the first and second rubber cylinder seats are mutually faced and are separated by a certain distance, and the distance forms a compression stroke;
one end of the rubber cylinder is sleeved on the first rubber cylinder seat and connected with the first rubber cylinder seat, and the other end of the rubber cylinder is sleeved on the second rubber cylinder seat and connected with the second rubber cylinder seat;
the supporting framework is arranged in a space enclosed by the rubber sleeve and the first and second rubber sleeve seats.
3. The framework-type telescopic sealing device according to claim 2, wherein the supporting framework comprises a plurality of groups of connecting rod assemblies arranged around the central axis of the rubber cylinder, each group of connecting rod assemblies comprises a first connecting rod, a second connecting rod and a connecting piece, wherein one end of the first connecting rod is hinged to the first rubber cylinder seat, one end of the second connecting rod is hinged to the second rubber cylinder seat, and the other end of the first connecting rod is hinged to the other end of the second connecting rod through the connecting piece.
4. The skeletal telescopic sealing device according to claim 3, wherein the other end of the first link and the other end of the second link each have a pre-bent structure protruding outward.
5. The skeletal telescopic sealing device according to claim 3, wherein the first rubber cylinder seat comprises a first axial section, a second axial section and a third axial section which are sequentially connected and have sequentially reduced thicknesses; the second rubber barrel seat comprises a fourth axial section, a fifth axial section and a sixth axial section which are sequentially connected and have sequentially reduced thicknesses; the end surfaces of the third axial section and the sixth axial section face each other;
two ends of the rubber cylinder are respectively connected to the first axial section and the fourth axial section;
one end of the first connecting rod is hinged to the second axial section;
one end of the second connecting rod is hinged to the fifth axial section.
6. The skeletal telescopic sealing device according to claim 5, wherein the first axial section and the fourth axial section are provided with one annular protrusion, and the two annular protrusions are used for connecting the rubber cylinders.
7. The skeletal telescopic sealing device according to claim 5, wherein the inner surfaces of the first, second and third axial segments are on the same curved surface; the inner surfaces of the fourth, fifth and sixth axial segments are on the same curved surface.
8. The skeletal telescopic sealing device according to claim 1, wherein the rubber cylinder further comprises a first stop collar, a second stop collar, a first rubber cylinder seat and a second rubber cylinder seat; wherein, the first and the second end of the pipe are connected with each other,
the first limiting sleeve and the second limiting sleeve face each other and are separated by a first distance, and the first distance forms a compression stroke;
the first and second rubber cylinder seats are respectively sleeved on the first and second limiting sleeves, a second distance is arranged between the first and second limiting sleeves, and the second distance is smaller than the first distance;
the rubber sleeve is sleeved on the first limiting sleeve and the second limiting sleeve, one end of the rubber sleeve is connected with the first rubber sleeve base, and the other end of the rubber sleeve is connected with the second rubber sleeve base.
9. The framework-type telescopic sealing device according to claim 8, wherein the supporting framework is disposed in a space surrounded by the rubber cylinder and the first and second limiting sleeves, and comprises a plurality of steel sheets arranged around a central axis of the rubber cylinder, the steel sheets are arc-shaped steel sheets with outward protruding directions, and two ends of each steel sheet are respectively connected with the first and second limiting sleeves.
10. The skeletal telescopic sealing device according to claim 8, further comprising a first stop ring and a second stop ring, wherein one end of the first stop ring and one end of the first rubber cylinder seat form a flat bearing end together, and one end of the second stop ring and one end of the second rubber cylinder seat form a flat bearing end together.
11. The skeletal telescopic sealing device according to claim 8, wherein the support skeleton is built into the wall of the rubber tube and comprises an elastic wire skeleton having a pre-bent structure protruding outward.
12. The skeletal telescopic sealing device according to claim 1, wherein the device achieves dynamic packing of a wellbore annulus by means of pressurized expansion and drill-up contraction.
13. A packer comprising a skeletal telescoping seal assembly according to any of claims 1 to 12.
14. Use of a skeletal telescopic sealing device according to any of claims 1 to 12 in isolation while drilling.
15. Use of a skeletal telescoping seal arrangement according to any of claims 1 to 12 in reverse circulation drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211205398.3A CN115434657A (en) | 2022-09-30 | 2022-09-30 | Skeleton type telescopic sealing device, packer and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211205398.3A CN115434657A (en) | 2022-09-30 | 2022-09-30 | Skeleton type telescopic sealing device, packer and application |
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| Publication Number | Publication Date |
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| CN115434657A true CN115434657A (en) | 2022-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211205398.3A Pending CN115434657A (en) | 2022-09-30 | 2022-09-30 | Skeleton type telescopic sealing device, packer and application |
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| CN (1) | CN115434657A (en) |
Cited By (1)
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| WO2024067533A1 (en) * | 2022-09-30 | 2024-04-04 | 中国石油天然气集团有限公司 | Packer apparatus while drilling and reverse circulation drilling device |
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