CN116446819A - Well packer and method for forming underground water circulation flow field based on same - Google Patents
Well packer and method for forming underground water circulation flow field based on same Download PDFInfo
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- CN116446819A CN116446819A CN202310442215.8A CN202310442215A CN116446819A CN 116446819 A CN116446819 A CN 116446819A CN 202310442215 A CN202310442215 A CN 202310442215A CN 116446819 A CN116446819 A CN 116446819A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 122
- 239000010959 steel Substances 0.000 claims abstract description 122
- 238000012856 packing Methods 0.000 claims abstract description 49
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 50
- 238000007789 sealing Methods 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 12
- 239000003673 groundwater Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims 1
- 239000002585 base Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Life Sciences & Earth Sciences (AREA)
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to an in-well packer and a method for forming an underground water circulation flow field based on the in-well packer. The packer comprises a central pipe, a packing assembly, a driving assembly and a positioning ring, wherein the packing assembly is arranged on the central pipe and can change the size of the cross section area of the packer to change the contact state with the wall of a circulating well; the driving assembly comprises a power ring connected with one end of the steel skeleton; the positioning ring comprises a first positioning ring and a second positioning ring, and the positioning rings are respectively connected with the central tube and are arranged on two sides of the power ring in a mode of limiting the deformation range of the steel skeleton by limiting the movable range of the power ring. The circulation method comprises the following steps: setting a packer in the well between a water pumping pipe and a water injection pipe; an upper screen pipe and a lower screen pipe are respectively arranged on the outer pipe of the circulating well at positions corresponding to the depths of the pipe orifices of the water suction pipe and the water injection pipe; the driving assembly is controlled by electric power or wireless signals to drive at least part of the packing assembly to move relative to the central tube and enlarge the cross section area of the packing assembly so as to seal the circulating well.
Description
Description of the division
The original foundation of the divisional application is a patent application with the application number of 202210149092.4, the application date of 2022, 2 and 17 days and the name of 'an underground water circulation well internal packer and a using method thereof'.
Technical Field
The invention relates to the technical field of underground water circulation well repairing devices, in particular to an in-well packer and a method for forming an underground water circulation flow field based on the in-well packer.
Background
With the development of the domestic underground water circulation well repairing technology, the development of a packer in a circulation well becomes a key problem in the practical application of the repair technology. The packer is used as a downhole tool for sealing and isolating different filter layers of a main well body of a circulating well to extract water in a layered manner, is mainly used for isolating extracted and injected well sections, is fixed on a central pipe, has working pressure which is different from tens of megapascals of the packer in an oil well, and is usually designed into a low-pressure working environment of several megapascals; the bore of the well pipe of the groundwater circulation well varies from 300mm to 1200mm, and a packer with a larger setting diameter or expansion ratio is required. In addition, the underground water multi-filter circulating well needs to consider the synchronous restoration of a plurality of polluted aquifers, and the current packer on the market is generally only aimed at a single treatment layer.
The conventional packer is mainly applied to oilfield drilling engineering, is connected to a downhole tubular column, seals an annular space between an oil pipe and an oil gas well casing or an open hole well wall, and has high compression resistance so as to adapt to a high-pressure environment of an oil well; the common packer has the defects of more accessories, time and labor consumption in production and the like, is unfavorable for assembly and use, can realize deblocking only by putting a special deblocking tool into the packer, and has the defects of low working efficiency, complex structure, small applicable caliber, complicated setting (deblocking) process and the like, so that the packer is not suitable for underground water circulation wells with large caliber and multi-filter layer packing.
Chinese patent CN213235011U provides a self-sealing compression packer, including hydraulic anchor, center tube and lower clutch, the inside screwed connection center tube that passes through in hydraulic anchor bottom, the back ring is established to hydraulic anchor lower extreme outside cover, sets up the pressure transfer pipe between back ring and the center tube, and the pressure transfer pipe both ends set up the through-hole, the back ring is close to the position that the pressure transfer managed top is provided with the pressure transfer hole, the position cover that the pressure transfer managed outside is close to back ring lower extreme is equipped with the packing element, and hydraulic compensation piston is established to the position cover that the bearing ring lower extreme is located the pressure transfer pipe outside, and the packing cup adapter sleeve top is provided with the pressure release hole, connects through the pin joint packing cup seal skeleton between boss and the center tube of catch pressure cap, the outside cover of packing cup lower extreme is established the packing cup compression cover, the position that the lower clutch is located the center tube lower extreme is provided with the ball seat, the position that the lower clutch lateral wall is located packing cup compression cover recess department sets up the pressure guide ring, the bottom of packing cup compression cover is connected through the shear pin. The packer designed by the patent can effectively prevent backflow, is convenient to set, is suitable for setting work of fracturing construction of horizontal wells, highly-deviated wells, ultra-deep wells and shallow wells, but has the advantages of multiple parts, complex structure, time and labor waste in mass production and higher cost.
Chinese patent CN111894510a provides a combined rubber cylinder type double-stage ultra-high pressure sealing packer, which mainly comprises a setting jaw, a locker i, an end rubber cylinder, a spacer ring, a middle rubber cylinder, a locker ii, a snap ring, a central tube, a cone and slips. The inner tube is connected with the upper joint and the sitting and placing binding claw through threads; the shell joint is connected with the shell I and the shell II through threads; the shell III is arranged on the outer side of the sitting and placing beam claw; the sitting and releasing binding claw is sleeved outside the sitting and releasing pup joint; the locker I is arranged on the outer side of the shell III; the locking seat is connected with the central tube through threads; the end rubber cylinder, the middle rubber cylinder and the spacing ring form a rubber cylinder group; the clamping ring is positioned between the locker II and the central tube; the slips are positioned between the cone and the slip table and fixed on the slip table; and the lower end of the central pipe is connected with the slip table and the lower joint through threads. The packer designed by the patent is suitable for working in an ultra-high pressure environment, can effectively improve the sealing pressure and the working reliability of the packer, but cannot meet the working requirements when a plurality of water-bearing layers exist in the working environment, and can finish the deblocking action only by locking the setting nipple and the lifting pipe column step by step; meanwhile, the slips can cover scale under the condition of long-term steam injection, so that the problems of difficult deblocking, blockage and the like occur, and the service performance is unreliable; in addition, due to the fact that the fittings are numerous, the operation is complex when setting/unsetting is carried out, uncontrollable factors are numerous, and setting/unsetting failure of the packer is easily caused.
Chinese patent CN110847847a provides a mechanical triggering type packer capable of repeatedly sealing and unsealing, including a central linking pipe, further including a fixed step and a locking component which are fixed on the central linking pipe, a triggering mechanism, an umbrella rib mechanism and a spring component are also sleeved on the central linking pipe between the fixed step and the locking component, the fixed part of the triggering mechanism is connected with the fixed step, the telescopic end of the triggering mechanism is connected with one end of the umbrella rib mechanism, the other end of the umbrella rib mechanism is connected with one end of the spring component, the other end of the spring component is connected with the locking component, and the water-swelling rubber cylinder is integrally sleeved on the fixed step, the triggering mechanism, the umbrella rib mechanism, the spring component and the locking component. However, the triggering mechanism in the invention needs to be directly contacted with the upper end ring to realize the opening and closing of the umbrella rib structure, and the expansion position can not be limited between the triggering mechanism and the upper end ring in a mode of arranging a positioning ring.
Therefore, to many problems existing in the prior art, a packer is required to be set to adapt to the working requirements of a large-caliber shaft and a higher expansion rate in a groundwater circulation well, and the packer can independently pack different screen sections of a multi-filter circulation well, realize the effect of simultaneously sitting/deblocking without mutual influence, is simple to operate, does not occupy the space in the well, realizes multistage packing by a mode of freely connecting and combining a water pumping pipe and a cable among different packers, and accurately controls deblocking according to the requirement.
Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, since the applicant has studied a lot of documents and patents while making the present invention, the text is not limited to details and contents of all but it is by no means the present invention does not have these prior art features, but the present invention has all the prior art features, and the applicant remains in the background art to which the right of the related prior art is added.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an in-well packer and a method for forming an underground water circulation flow field based on the same, which can complete the setting and unsetting processes through electric control, and can assist in realizing independent packing of different screen sections of a multi-filter circulation well in practical application without being limited by an unsetting tool and a setting tool; the device has the advantages of simple structure, stable performance, repeated use, capability of rapidly completing assembly and application, simple and convenient setting (deblocking) operation, effective improvement of production period and reduction of cost, and is suitable for the working requirements of large-caliber shaft and higher expansion rate of underground water circulation wells. The specific technical scheme is as follows:
an in-well packer disposed on a base pipe, comprising:
a packing assembly: the device comprises a steel skeleton which can change the size of the cross section area of the steel skeleton so as to change the contact state of a surface rubber cylinder and the wall of a circulating well, and a driving assembly which is connected with the steel skeleton and drives one end, connected with the driving assembly, of the steel skeleton to move along the central axis of a central tube based on the connection. The steel skeleton deforms and switches between the set and unset states based on the movement. The steel skeleton itself constitutes simple structure, connects stably, uses and changes with low costs. When the state of setting and unsetting is switched, the steel skeleton generates the change of the cross-sectional area based on the deformation of the steel skeleton, the thrust towards the surrounding well wall can be generated, and the thrust and the change of the cross-sectional area can be adaptively designed by changing the material and the size of the steel skeleton based on the actual size of the circulating well. The elastic force generated by the self deformation extrusion of the steel skeleton is uniform and stable in direction, excessive deformation of the steel skeleton and loss of surface rubber cylinder materials can not be generated by repeated sitting/deblocking within the elastic limit of the steel skeleton, the steel skeleton can be stably used for a long time, and better sealing, pollution resistance and corrosion resistance can be generated by combining the elastic force of the rubber cylinder. The effective contact area of the rubber cylinder and the wall of the circulating well is a main factor for determining the sealing performance of the packer. The rubber sleeve is wrapped on the surface of the steel wire forming the steel skeleton, so that the steel skeleton is ensured to be in straight-long type and closely attached to the wall of the circulating well after setting. The thrust of the driving assembly is also an important factor for determining the sealing performance of the packer, and the packer enables the elastic force to be evenly dispersed through the sleeves on the steel wires which are evenly distributed, and the uniform thrust is independently generated in the circumferential direction, so that the steel skeleton can bear larger pressure. Under the condition that a single steel wire is damaged, the elasticity of the surrounding rest steel wires can provide elasticity compensation, and support is temporarily provided for a damaged part, so that the leakage risk can be reduced, and the influence caused by structural damage can be weakened; and the steel wire can be unsealed under the condition of being infiltrated by water vapor due to the integral structure of the steel skeleton, so that the situation that a packer is difficult to take out due to the clamping of a well can be avoided. The invention can lengthen the whole steel skeleton by lengthening the steel wire, thereby enabling the rubber cylinder part to be attached to the well wall more, and further effectively improving the packing effect. Compared with most packer components, the invention has the advantages of short production and assembly period, repeated recycling and capability of obtaining higher technical benefit at lower cost. In the use process, the packer can quickly realize setting/unsetting operation, and can effectively avoid the problems of long accessory replacement period, well clamping, unstable setting/unsetting process and the like caused by a plurality of accessories and complex principles.
According to a preferred embodiment, the drive assembly comprises a power ring connected to one end of the steel skeleton and a transmission rod and a power unit for driving the movement of the power ring. The power ring is movably sleeved on the first end of the central tube, the power device can drive the transmission rod to rotate based on the axis of the power device, the transmission rod is connected with the transmission rod, and the transmission rod can drive the power ring to movably connect with the power ring based on the rotation of the transmission rod. The screw angle of the transmission rod is set to be 5-8 degrees, and the distance is 1-3 mm so as to prevent the sliding of the screw; and high-strength steel is selected as a power transmission rod for production so as to bear enough pressure and ensure stable operation of setting conditions.
The power device and the transmission rod are movable at fixed positions, the movable space required by the movable mode based on the rotation of the axis of the power device and the transmission rod is small, the size of the working area is not required to be considered when the working environment is selected, and the power device and the transmission rod can adapt to small space in a well and multilayer stacking operation.
According to a preferred embodiment, the packing assembly further comprises a rubber sleeve which is coated on the outer wall of the steel skeleton, can adapt to deformation of the steel skeleton and further deforms and contacts with the inner wall of the circulating well. The steel wires forming the steel skeleton are contacted with the rubber drum at uniform intervals and uniformly push the rubber drum to deform and contact with the wall of the circulating well when deforming, so that setting is realized, namely, the circulating wells on two sides are separated from the joint through the effective joint of the shape formed after the deformation of the waterproof rubber drum and the wall of the circulating well. The rubber cylinder has good physical and chemical stability, has certain tensile strength to adapt to setting/deblocking of the packer, is pollution-resistant and acid and alkali corrosion-resistant, has long service life, and can effectively protect the steel wire and avoid the steel wire from being infiltrated and oxidized and corroded by water vapor in use.
According to a preferred embodiment, two ends of the rubber cylinder are respectively connected with the base and the device main board, when the steel skeleton changes from the deblocking state to the setting state, the steel skeleton slides relative to the inner wall of the rubber cylinder, and at the moment, the rubber cylinder is in contact with the inner wall of the circulating well. When the cross section area of the steel skeleton is increased by deformation, the steel skeleton contacts with the inner wall of the rubber cylinder when the cross section area of the steel skeleton is larger than that of the rubber cylinder, and pushes the outer wall of the rubber cylinder to approach the circulating well and finally contact with the inner wall of the circulating well to realize setting. A sleeve is wrapped on the surface of the steel wire forming the steel skeleton to limit the steel skeleton after starting setting to be in straight long fit with the wall of the circulating well; the rubber cylinder cannot rub against the wall of the circulating well along with the movement of the steel skeleton relative to the central pipe in the setting process; under the condition of avoiding friction, the deformation of the steel skeleton can be enlarged, so that the damage of the rubber cylinder is not easy to occur, and the sealing performance of the packer can be fully ensured.
According to a preferred embodiment, the packer in the underground water circulation well further comprises an elastic sheet layer, wherein two ends of the elastic sheet layer are respectively connected with the base and the device main board, when the steel skeleton changes from an unset state to a set state, the rubber cylinder slides relative to the inner wall of the elastic sheet layer, and at the moment, the elastic sheet layer is in contact with the inner wall of the circulation well so as to reduce abrasion of the rubber cylinder, thereby prolonging the service life of the packer and reducing the replacement frequency of the packer. The elastic sheet layer can also ensure that the power ring, the transmission rod and the like are not infiltrated by water vapor, thereby prolonging the static packing time of the packer.
According to a preferred embodiment, the packer in the underground water circulation well further comprises positioning rings, wherein the positioning rings comprise a first positioning ring and a second positioning ring, and the first positioning ring and the second positioning ring are respectively arranged on two sides of the power ring and connected with the central pipe in a mode of limiting the movable range of the power ring and limiting the deformation range of the steel skeleton. The setting of retainer plate can avoid losing elasticity after the steel skeleton excessively warp. The device main board and the base are arranged at the dent position of the central tube, and the position of the device main board and the base can be limited after the central tube is spliced, so that the packer is prevented from sliding up and down integrally.
According to a preferred embodiment, the setting is connected to the second setting collar by a securing rod in a manner that increases the stability of the in-well packer.
According to a preferred embodiment, the end of the transmission rod opposite to the power unit is movably connected with the second positioning ring in a manner that can increase the stability of the well packer.
According to a preferred embodiment, the steel skeleton is formed by a plurality of steel wires which are consistent with the direction of the central axis of the central tube and are separated from each other, and the steel wires are in interval contact with the rubber cylinder. The sleeve wrapped on the surface of the steel wire can limit the steel skeleton to be in straight long fit with the wall of the circulating well after the setting is started; the multiunit steel wire can be more firm when handling the high pressure, also can support for a longer time based on self elasticity when handling the situation that single steel wire damaged simultaneously, and above-mentioned setting can effectively guarantee to seal and separate the effect.
The invention also provides a method for using the well packer, which comprises the following steps:
s1, placing the well packer into a part needing to be sealed in the circulating well, and arranging the well packer in such a way that the axis of a central tube is parallel to the axis of the circulating well;
s2, controlling the power device to drive the transmission rod to rotate towards a third direction, so that the steel skeleton is deformed under the drive of the power ring to increase the cross section area of the steel skeleton and the contact area of the rubber sleeve and the inner wall of the circulating well to enter a setting state;
and S3, when the sealing is required to be released, controlling the power device to drive the transmission rod to rotate in a fourth direction opposite to the third direction, so that the steel skeleton is driven by the power ring to recover deformation to reduce the cross section area of the steel skeleton and reduce the contact area of the rubber sleeve and the inner wall of the circulating well to enter a sealing release state.
In another aspect of the invention, a circulating well packing method is provided, wherein the driving assembly drives at least part of the packing assembly to move along a first direction relative to the central tube so as to deform the packing assembly to enlarge the cross-sectional area of the packing assembly and make contact with the wall of the circulating well, thereby realizing setting. The driving assembly drives at least part of the packing assembly to move along a second direction opposite to the first direction relative to the central tube so that the deformation of the packing assembly is recovered to reduce the cross-sectional area of the packing assembly and separate from contact with the wall of the circulating well to realize the deblocking. The packer of the invention has the following advantages:
(1) The packing assembly is of a pure mechanical structure, the packer is driven by the electric driving assembly to deform, the probability of control failure is low, and meanwhile, the structure is simple and the assembly is simple and convenient;
(2) The control of the driving assembly can be controlled by an electric signal or a wireless signal, redundant accessories are not needed to be put into the well during the starting of the setting and unsetting process, and a plurality of packers of the multi-filter circulating well can be set/unset at the same time without mutual influence;
(3) The fittings of the packing assembly have simple structure, the materials are pollution-resistant and corrosion-resistant, the packing assembly can be recycled for a plurality of times, and the assembly and maintenance costs are low;
(4) The packing assembly can be completely put into the circulation well without underground assembly, and has small moving range, small occupied space and larger reaction space reserved in the circulation well during working.
The invention also provides a method for driving the groundwater of the aquifer around the circulation well to vertically circulate, which comprises the following steps:
s1, arranging a water pumping pipe and a water injection pipe in the well at different depths, wherein a packer in the well is arranged between the water pumping pipe and the water injection pipe;
s2, screen pipes are respectively arranged on the well body of the circulating well at the depth positions corresponding to the pipe orifices of the water suction pipe and the water injection pipe so as to facilitate inflow or outflow of underground water in the well;
s3, controlling the electric driving assembly to drive at least part of the packing assembly to move relative to the central pipe through electric power or wireless signals and expanding the cross section area of the packing assembly to seal the circulating well;
s4, starting pumping water, and further driving groundwater in aquifers around different screen sections to form a vertical circulation flow field.
The beneficial effect of this setting lies in: the precise control for stacking a plurality of packers in the same circulating well can be realized in an auxiliary mode by controlling the deblocking and setting states of the packers in the well and the smaller volume of the packers in the well through electric power or wireless signals, so that a plurality of vertical water flow circulating units can be formed in different water-containing layers according to the repairing needs.
Drawings
FIG. 1 is a schematic illustration of the invention applied to an underground water circulation well;
FIG. 2 is a schematic view of the structure of a steel skeleton uncoated packing element in deblocking according to the present invention;
FIG. 3 is a schematic view of a steel skeleton coating rubber cylinder structure during deblocking of the invention;
FIG. 4 is a schematic view of the steel skeleton uncoated packing element structure during setting;
FIG. 5 is a schematic cross-sectional view of the power ring, the guard ring, and the second retainer ring of the present invention;
fig. 6 is a schematic diagram of a driving assembly structure of the present invention.
List of reference numerals
1: a central tube; 2: a base; 3: a steel skeleton; 301: steel wire the method comprises the steps of carrying out a first treatment on the surface of the; 4: a rubber cylinder; 5: a seal ring; 6: a positioning ring; 601: a first positioning ring; 602: a second positioning ring; 7: a drive assembly; 701: a transmission rod; 702: a power device; 703: a power ring; 8: a second thread; 9: a nut; 10: an elastic member; 11: a protective ring; 12: a fixed rod; 13: an upper sieve tube; 14: a lower sieve tube; 15: a water pumping pipe; 16: a water injection pipe; 17: a sleeve.
Detailed Description
The following is a detailed description with reference to fig. 1-6.
Example 1
The embodiment provides an in-well packer which can realize the sealing of a water pumping and injecting area in a circulating well through being attached to the wall of the circulating well. The packer at least comprises a central tube 1 for passing cables, pipelines and the like, a base 2 surrounding the outer wall of the central tube 1 and a packing assembly capable of changing the size of the cross section area of the packer to change the contact state with the wall of a circulating well. Preferably, the central tube 1 has a first end and a second end, the base 2 is disposed at the first end of the central tube, and the packing assembly at least comprises a steel skeleton 3 and a rubber sleeve 4, wherein the steel skeleton 3 and the rubber sleeve 4 change the volume of the packing assembly to change the contact area with the wall of the circulating well so as to change the communication state of the circulating well, and the steel skeleton 3 is in a cylindrical shape with two ends facing the central tube and capable of being deformed. Preferably, the steel skeleton 3 is composed of a plurality of steel wires 301 arranged in order. Each steel wire can generate thrust towards the periphery based on self elasticity to promote the packing element 4 cladding in the outside of cylindrical steel skeleton 3 to take place deformation and laminating in the wall of a well. Preferably, the steel skeleton 3 is arranged to be deformable to change its cross-sectional area and the contact area with the walls of the circulation well. Preferably, the rubber cylinder 4 is configured to be elastically deformable, and the rubber cylinder 4 is configured to be deformed in response to a change in shape of the steel skeleton 3 when the steel skeleton 3 is deformed. Preferably, the rubber cylinder 4 is tightly contacted with the wall of the circulating well under the action of pressure generated after the steel skeleton 3 is deformed, so that the sealing of the circulating well is realized. Preferably, the surface of the steel wire 301 is wrapped with a sleeve 17 so as to limit the steel skeleton 3 to be in straight long fit with the wall of the circulating well when the setting is started, thereby effectively ensuring the packing effect. Preferably, the inside of the central tube 1 is provided in a hollow honeycomb shape so as to pass through necessary elements such as cables or pipes. Preferably, the outer wall of the base 2 is provided with a sealing ring 5.
According to a preferred embodiment, the packing assembly further comprises a driving assembly 7 for controlling whether or not the steel skeleton 3 is deformed and the magnitude of the deformation, the driving assembly 7 comprising a transmission rod 701, a power unit 702 and a power ring 703. Preferably, the power ring 703 is disposed at the second end of the central tube 1, and the power ring 703 is movably sleeved on the central tube 1. Preferably, the several wires 301 constituting the steel skeleton 3 have a third end and a fourth end, respectively, the third end of the wire 301 being connected to the power ring 703 and the fourth end of the wire 301 being connected to the base 2. Preferably, the third ends of the plurality of wires 301 are connected to the outer circumference of the power ring 703. Preferably, the intervals of the plurality of steel wires 301 are uniform. Preferably, the power ring 703 is further internally provided with at least one inner annular ring having an axis substantially parallel to the axis of the central tube 1. Preferably, the inner ring is fixedly connected with a nut 9, and a first thread is arranged on the inner wall of the nut 9. The transmission rod 701 includes a fifth end and a sixth end, and the fifth end of the transmission rod 701 is inserted into the inner ring to collide with the inner wall of the inner ring or collide with the inner wall of the nut 9 and is linked based on the collision. Preferably, the transmission rod 701 is provided with a second thread 8 which is engaged with the first thread on the inner wall of the inner ring, and when the transmission rod 701 rotates, the power ring 703 can be driven to move relative to the transmission rod 701 in the axial direction of the transmission rod 701 based on the presence of the first thread and the second thread 8 engaged with each other. Preferably, the angle of the second thread 8 of the transmission rod 701 is set to 5 ° to 8 ° and the interval is 1mm to 3mm to prevent the sliding of the thread, and the transmission rod 701 is produced by using high-strength steel as a raw material to bear pressure and ensure stable operation in the setting condition. Preferably, the inner ring is at least provided with two symmetrical power rings 703 relative to the center of the circle, so that the power rings 703 can stably move along the axial direction of the transmission rod 701 when the transmission rod 701 rotates, and abnormal deformation of the steel wires 301 connected with the power rings cannot be caused by deflection, thereby affecting the packing effect of the well packer. Preferably, the sixth end of the transmission rod 701 is connected to a power device 702, and the power device 702 can drive the transmission rod 701 to rotate along its own axis in a third direction or a fourth direction opposite to each other based on externally supplied electric energy or other control, so as to drive the power ring 703 to move along the axis direction of the transmission rod 701, and further drive the steel skeleton 3 to deform or recover deformation, so as to complete setting and unsetting movements. Preferably, the power unit 702 is rotatably connected to the sixth end of the transmission rod 701, for example, by a gear connection. When the power unit 702 drives the two transmission rods 701 respectively connected with the two inner rings to rotate around the axis of the transmission rods, the rotation direction is adjusted according to the self thread direction and the direction of the threads on the inner rings matched with the self threads, so that the control force ring 703 moves towards the same direction when the two transmission rods 701 simultaneously rotate, and both move upwards or downwards. Preferably, the packer further comprises a device main plate, which is arranged on the second end of the central tube 1. Preferably, the device motherboard is disposed on the side of the power ring 703 near the second end of the center tube 1. Preferably, a sealing ring 5 is arranged outside the power ring 703. Preferably, the device main board and the base 2 are arranged at the dent of the central tube 1, and the positions of the device main board and the base 2 can be limited after the device main board and the base 2 are spliced with the central tube 1, so that the packer is prevented from sliding up and down integrally, and the packer can stably run.
According to a preferred embodiment, the packer of the present embodiment further comprises a setting collar 6, the setting collar 6 being adapted to limit the distance the power ring 703 moves in the axial direction of the transmission rod 701. The positioning ring 6 at least comprises a first positioning ring 601 and a second positioning ring 602 coaxially arranged on the central tube 1, wherein the first positioning ring 601 and the second positioning ring 602 are respectively arranged on two sides of the power ring 703, so that the distance of the power ring 703 moving along the axial direction of the transmission rod 701 is limited between the first positioning ring 601 and the second positioning ring 602, and further the setting and unsetting positions of the power ring 703 are limited, meanwhile, overstretching of steel wires is avoided, the elastic deformation of the steel skeleton 3 is reasonably controlled, and the service life of the packer is prolonged. Preferably, the first positioning ring 601 is disposed between the device motherboard and the power ring 703.
Preferably, the fifth end of the transmission rod 701 connected to the inner ring penetrates the inner ring and is movably connected to the second positioning ring 602. Preferably, the fifth end of the transmission rod 701 is connected to the second positioning ring 602 by a bearing. Preferably, the second positioning ring 602 is further connected with a protection ring 11 through an elastic member 10. At least two elastic pieces 10 are uniformly arranged between the second positioning ring 602 and the protection ring 11, so that when the power ring 703 moves to be in contact with the second positioning ring 602, the power ring 703 can be contacted with the protection ring 11 first and a buffer effect is generated due to the existence of the elastic pieces 10, and meanwhile, the impact on the second positioning ring 602 when the power ring 703 moves faster is avoided, so that the service life of the power ring 703 or the second positioning ring 602 is shortened. Preferably, the elastic element 10 may be embodied as a spring. Preferably, the second bezel 602 and the base 2 are connected by at least two fixing bars 12 so that the second bezel 602 and the base 2 can support each other as necessary.
For ease of understanding, the working principle of the packer provided in this embodiment is described below:
setting process: the control power device 702 drives the transmission rod 701 to rotate towards the third direction, the transmission rod 701 drives the power ring 703 to move towards the second positioning ring 602 based on the first threads and the second threads 8 which are mutually abutted, and then the steel skeleton 3 is driven to deform, the whole elastic expansion is carried out, the cross section area of the steel skeleton 3 is enlarged, the contact area between the rubber cylinder 4 coated on the outer side of the steel skeleton 3 and the inner wall of the circulating well is gradually increased, when the power ring 703 moves to be in indirect contact with the second positioning ring 602 through the protection ring 11 and the elastic piece 10 is completely compressed, the contact area between the rubber cylinder 4 and the wall of the circulating well is the largest, at the moment, the control power device 702 stops rotating, and the packer completes the setting process and is kept in the setting state.
And (3) deblocking process: the control power device 702 drives the transmission rod 701 to rotate towards a fourth direction opposite to the third direction, the transmission rod 701 drives the power ring 703 to move towards the first positioning ring 601 based on the first threads and the second threads 8 which are mutually abutted, and then the steel skeleton 3 is driven to gradually recover deformation, the cross section area of the steel skeleton 3 is gradually reduced, and the contact area between the rubber cylinder 4 and the inner wall of the circulating well is gradually reduced. When the power ring 703 moves to contact with the first positioning ring 601, the contact area between the rubber cylinder 4 and the inner wall of the circulation well is minimum, even the rubber cylinder 4 is not in contact with the inner wall of the circulation well, at this time, the power unit 702 is controlled to stop rotating, so that the packer completes the deblocking process and is kept in the deblocking state.
Example 2
The embodiment provides a method for recycling groundwater of an in-well packer according to embodiment 1, comprising the following steps:
s1, placing the well packer into a part needing to be sealed in the circulating well, and arranging the packer in such a way that the axis of the central tube 1 is parallel to the axis of the circulating well;
s2, controlling the power device 702 to drive the transmission rod 701 to rotate towards a third direction, so that the steel skeleton 3 is deformed under the drive of the power ring 703, the cross-sectional area of the steel skeleton is increased, and the contact area between the rubber sleeve 4 and the inner wall of the circulating well is increased to enter a setting state;
s3, when deblocking is needed, the power device 702 is controlled to drive the transmission rod 701 to rotate in a fourth direction opposite to the third direction, so that the steel skeleton 3 is driven by the power ring 703 to recover deformation, reduce the cross-sectional area of the steel skeleton, and reduce the contact area between the rubber sleeve 4 and the inner wall of the circulation well to enter a deblocking state.
Example 3
A method for driving underground water to vertically circulate comprises the following steps:
s1, arranging a water pumping pipe 15 and a water injection pipe 16 in a well, wherein the specific arrangement positions are set according to the actual condition of a circulating well;
s2, respectively arranging an upper screen pipe 13 and a lower screen pipe 14 on the outer pipe of the circulating well at the depth positions corresponding to the pipe orifices of the water suction pipe and the water injection pipe;
and S3, when the in-well packer is in a setting state, the water pump is started to pump water, so that the groundwater of the aquifer around the circulating well is driven to vertically circulate.
Example 4
This embodiment is a further improvement and supplement to embodiment 1, and the repeated contents are not repeated.
According to a preferred embodiment, the outer sides of the base 2 and the device main board are also provided with an elastic sheet layer, the elastic sheet layer is coated on the outer side of the rubber cylinder 4, one end of the elastic sheet layer is connected with the periphery of the base 2, and the other end of the elastic sheet layer is connected with the outer side of the device main board. Preferably, the elastic sheet layer is also capable of elastic deformation. When setting is carried out, the cross-sectional area of the steel skeleton 3 is increased due to deformation, so that the rubber cylinder 4 is supported to elastically deform and pushed to the outside, the rubber cylinder 4 is contacted with the inner wall of the elastic sheet layer, and meanwhile, the rubber cylinder 4 pushes the outer wall of the elastic sheet layer to be contacted with the wall of the circulating well. Such setting means is favorable to when steel skeleton 3 and packing element 4 remove in order to sit to seal and to seal, packing element 4 and the inner wall contact of elastic lamina but not with the rough inner wall contact of circulation well, and then can not cause packing element 4 to be scratched by the burr in the in-process of setting and unsealing, avoids influencing the setting effect. Meanwhile, the positions of the base 2 and the device main board are kept unchanged all the time in the whole setting process, so that the relative positions of the outer wall of the elastic sheet layer and the inner wall of the circulating well are kept unchanged, the elastic sheet layer cannot generate friction and relative sliding with the inner wall of the circulating well, and the elastic sheet layer can be prevented from being scratched.
According to a preferred embodiment, the rubber cylinder 4 has a seventh end and an eighth end, the seventh end of the rubber cylinder 4 being connected to the circumferential direction of the base 2, and the eighth end of the rubber cylinder 4 being connected to the circumferential direction of the device main plate. Preferably, the diameters of the base 2 and the device main plate are smaller than the diameter of the circulation well and smaller than the maximum cross-sectional area of the deformed steel skeleton 3. In the setting process, the cross section area of the rubber cylinder 4 is increased by controlling the steel skeleton 3 to deform, and then the rubber cylinder 4 is pushed by a plurality of steel wires 301 forming the steel skeleton 3 towards the direction away from the axis of the central tube, so that the rubber cylinder 4 is elastically deformed and is in contact with the inner wall of the circulating well. The setting mode is favorable for preventing friction between the rubber cylinder 4 and the inner wall of the circulating well in the setting and unsetting processes, further preventing the rubber cylinder 4 from being scratched or worn, and reducing the failure rate of the packer and prolonging the service life of the packer.
According to a preferred embodiment, the surface of the steel wire 301 forming the steel skeleton 3 is wrapped with the sleeve 17, so that the steel skeleton 3 is ensured to be attached to the wall of the circulating well in a straight and long mode after setting, and the deformation of the rubber sleeve 4 can be pushed to be matched with the shape of the inner wall of the circulating well by limiting the shape of the steel wire 301, so that the sealing effect of the packer is improved. The packer has the advantages that the elasticity is uniformly dispersed through the sleeves 17 on the steel wires 301, and uniform thrust is independently generated in the circumferential direction, so that the steel skeleton 3 can bear larger pressure; in case of damage to a single wire 301, the surrounding remaining wires 301 can provide spring force compensation, temporarily providing support for the damaged portion, so that the risk of leakage can be reduced and the impact caused by structural damage can be reduced.
It should be noted that the above-described embodiments are exemplary, and that a person skilled in the art, in light of the present disclosure, may devise various solutions that fall within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the invention is defined by the claims and their equivalents. The description of the invention encompasses multiple inventive concepts, such as "preferably," "according to a preferred embodiment," or "optionally," all means that the corresponding paragraph discloses a separate concept, and that the applicant reserves the right to filed a divisional application according to each inventive concept. Throughout this document, the word "preferably" is used in a generic sense to mean only one alternative, and not to be construed as necessarily required, so that the applicant reserves the right to forego or delete the relevant preferred feature at any time.
Claims (10)
1. An in-well packer provided on a center pipe (1), comprising:
the power ring (703), the inside interior ring that is provided with of power ring (703) at least one axis and center tube (1) axis are parallel, interior ring fixedly connected with nut (9), be provided with first screw thread on the inner wall of nut (9), transfer line (701) are including fifth end and sixth end, the fifth end of transfer line (701) inserts in the interior ring with the inner wall conflict of interior ring or with the inner wall of nut (9) conflict and based on conflict linkage, be provided with on transfer line (701) with interior ring inner wall on first screw thread fit second screw thread (8), when transfer line (701) produce the rotation, can drive power ring (703) and remove in the axis direction of transfer line (701) relative transfer line (701) based on the existence of first screw thread and second screw thread (8) that agree with each other.
2. The in-well packer of claim 1, comprising:
the packing assembly comprises a steel skeleton (3) and can change the cross-sectional area of the packing assembly to change the contact state with the wall of a circulating well;
the driving assembly (7), the driving assembly (7) comprises a power ring (703) connected with one end of the steel skeleton (3);
the positioning ring (6), the positioning ring (6) comprises a first positioning ring (601) and a second positioning ring (602), and the first positioning ring (601) and the second positioning ring (602) are respectively connected with the central tube (1) and are arranged on two sides of the power ring (703) in a mode of limiting the deformation range of the steel skeleton (3) by limiting the movable range of the power ring (703).
3. The downhole packer according to claim 1 or 2, further comprising a base (2) and a device main board, wherein the base (2) and the device main board are respectively arranged at two ends of the central pipe (1), one end of the steel skeleton (3) deviating from the power ring (703) is connected with the base (2), the device main board is arranged at one side of the first positioning ring (601) away from the power ring (703), the device main board and the base (2) are arranged at the dent of the central pipe (1), and the position of the device main board and the base (2) can be limited after the central pipe (1) is spliced, so that the packer is prevented from sliding up and down integrally.
4. A downhole packer according to any of claims 1-3, wherein the driving assembly (7) further comprises a transmission rod (701) and a power unit (702) for driving the movement of the power ring (703); the driving assembly (7) is connected with the steel skeleton (3) and drives one end, connected with the driving assembly (7), of the steel skeleton (3) to move along the central axis of the central tube (1) based on the connection, and the steel skeleton (3) deforms and switches setting and unsetting states based on the movement.
5. The downhole packer according to any one of claims 1-4, wherein the power ring (703) is movably sleeved on the first end of the central tube (1), the power device (702) is connected with the transmission rod (701) in a manner of being capable of driving the transmission rod (701) to rotate, and the transmission rod (701) is connected with the power ring (703) in a manner of being capable of driving the power ring (703) to move up and down along the central tube (1) based on rotation.
6. The in-well packer according to any one of claims 1 to 5, wherein the steel skeleton (3) is formed by a plurality of steel wires (301) circumferentially arrayed around the central axis of the central tube (1), and the surfaces of the steel wires (301) are wrapped with sleeves (17) to limit the steel skeleton (3) after the setting is started to be attached to the wall of the circulating well in a straight and long mode. The packing assembly further comprises a packing sleeve (4) which is coated on the outer wall of the steel skeleton (3), can adapt to deformation of the steel skeleton (3) and further deform and is in contact with the inner wall of the circulating well so as to pack the circulating well.
7. A downhole packer according to any of claims 1-6, wherein the second setting collar (602) is connected with a protection collar (11) by means of an elastic element (10), the protection collar (11) being arranged on the side close to the power collar (703) in such a way that it is possible to create a buffer in case the power collar (703) moves along the base pipe (1) into contact with the second setting collar (602).
8. A method of circulating groundwater in a circulating well seal, characterized in that the circulating well seal is carried out using an in-well packer according to any one of claims 1 to 7.
9. The recycling method according to claim 8, characterized by comprising the steps of:
placing the well packer into a part needing to be sealed in the circulating well, and arranging the packer in such a way that the axis of the central tube (1) is parallel to the axis of the circulating well;
the power device (702) is controlled to drive the transmission rod (701) to rotate towards a third direction, so that the steel skeleton (3) is deformed under the drive of the power ring (703) to increase the cross section area of the steel skeleton and the contact area between the rubber cylinder (4) and the inner wall of the circulating well to enter a setting state;
when the sealing is required to be unsealed, the power device (702) is controlled to drive the transmission rod (701) to rotate towards a fourth direction opposite to the third direction, so that the steel skeleton (3) is deformed under the drive of the power ring (703) in a recovery mode to reduce the cross section area of the steel skeleton and the contact area between the rubber cylinder (4) and the inner wall of the circulating well to enter the unsealed state.
10. The recycling method according to claim 8 or 9, characterized by comprising the steps of:
a water pumping pipe (15) and a water injection pipe (16) are arranged in the well, and a packer in the well is arranged between the water pumping pipe (15) and the water injection pipe (16);
an upper screen pipe (13) and a lower screen pipe (14) are respectively arranged on the outer pipe of the circulating well at the depth positions corresponding to the pipe orifices of the water suction pipe (15) and the water injection pipe (16);
the driving assembly (7) is controlled by electric power or wireless signals to drive at least part of the packing assembly to move relative to the central tube (1) and enlarge the cross section area of the packing assembly so as to seal the circulating well;
and (3) starting a water pump to pump water so as to drive the underground water of the aquifer around the circulating well to vertically circulate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310442215.8A CN116446819A (en) | 2022-02-17 | 2022-02-17 | Well packer and method for forming underground water circulation flow field based on same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310442215.8A CN116446819A (en) | 2022-02-17 | 2022-02-17 | Well packer and method for forming underground water circulation flow field based on same |
| CN202210149092.4A CN114458224B (en) | 2022-02-17 | 2022-02-17 | Underground water circulation well internal packer and use method thereof |
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| CN202210149092.4A Division CN114458224B (en) | 2022-02-17 | 2022-02-17 | Underground water circulation well internal packer and use method thereof |
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| CN116446819A true CN116446819A (en) | 2023-07-18 |
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| CN202310442215.8A Pending CN116446819A (en) | 2022-02-17 | 2022-02-17 | Well packer and method for forming underground water circulation flow field based on same |
| CN202210149092.4A Active CN114458224B (en) | 2022-02-17 | 2022-02-17 | Underground water circulation well internal packer and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114988556B (en) * | 2022-05-24 | 2023-09-22 | 成都理工大学 | Method and device for enhancing migration of repairing agent in low-permeability area based on circulating well |
| CN116398082B (en) * | 2023-06-07 | 2023-09-05 | 太原理工大学 | Multi-aquifer packing device, water taking device and water taking method for deep geothermal well |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1257790A (en) * | 1967-12-20 | 1971-12-22 | ||
| US8602116B2 (en) * | 2010-04-12 | 2013-12-10 | Halliburton Energy Services, Inc. | Sequenced packing element system |
| EP2758707A2 (en) * | 2011-09-20 | 2014-07-30 | Saudi Arabian Oil Company | Through tubing pumping system with automatically deployable and retractable seal |
| JP2013245444A (en) * | 2012-05-24 | 2013-12-09 | Nbl Technovator Co Ltd | Water injection sealing structure for high-pressure pipe for oil well |
| CN105156063B (en) * | 2015-09-23 | 2017-10-31 | 天鼎联创密封技术（北京）有限公司 | Skeleton seal and packer |
| CA3040185A1 (en) * | 2016-11-03 | 2018-05-11 | Terves Inc. | Self-actuating device for centralizing an object |
| CN207583344U (en) * | 2017-11-27 | 2018-07-06 | 中国石油大学(华东) | A kind of metallic framework packing element |
| CN110500059B (en) * | 2018-05-18 | 2021-06-08 | 中国石油化工股份有限公司 | Expansion packer rubber barrel capable of retracting rapidly |
| CN110847847A (en) * | 2019-11-13 | 2020-02-28 | 中国地质调查局武汉地质调查中心(中南地质科技创新中心) | Mechanical trigger type packer capable of repeatedly setting and unsetting |
| CN112855067B (en) * | 2019-11-28 | 2022-11-25 | 中国石油化工股份有限公司 | Mechanical expansion type leakage stopping tool and leakage stopping method thereof |
| CN211664865U (en) * | 2020-01-07 | 2020-10-13 | 上格环境科技（上海）有限公司 | Groundwater circulation well normal position prosthetic devices |
| CN214787301U (en) * | 2021-03-18 | 2021-11-19 | 河北通运石油机械有限公司 | Packer for oil production pipeline |
-
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| CN114458224A (en) | 2022-05-10 |
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