CN115749671A - Constant-pressure trapping and leaking stoppage tool and method for drilling - Google Patents
Constant-pressure trapping and leaking stoppage tool and method for drilling Download PDFInfo
- Publication number
- CN115749671A CN115749671A CN202310017227.6A CN202310017227A CN115749671A CN 115749671 A CN115749671 A CN 115749671A CN 202310017227 A CN202310017227 A CN 202310017227A CN 115749671 A CN115749671 A CN 115749671A
- Authority
- CN
- China
- Prior art keywords
- ring
- wall
- piston
- conical
- valve body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 238000010008 shearing Methods 0.000 claims description 15
- 238000012856 packing Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 10
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- Y02E10/20—Hydro energy
Landscapes
- Earth Drilling (AREA)
- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention discloses a constant pressure trap leakage stopping tool and a leakage stopping method for a drilling well, wherein the leakage stopping tool comprises: the outer wall of the central tube is sequentially sleeved with a seat hanging mechanism, a rubber cylinder, a piston, a sealing ring and a guide shoe from top to bottom, a cylinder sleeve is arranged on the outer surface of the piston, the piston is arranged between the central tube and the cylinder sleeve, and the upper end of the guide shoe is connected with the cylinder sleeve. An oil hole is formed in the central pipe, a drilling fluid flow passage is arranged between the piston and the sealing ring, and the oil hole is communicated with the drilling fluid flow passage; the valve body is arranged in the central tube and is positioned below the oil hole. The device has simple structure, is convenient to assemble, and can effectively block the leakage of the leakage layer. The plugging method is simple to operate and can effectively ensure the plugging effect.
Description
Technical Field
The invention relates to the technical field of well drilling plugging, in particular to a constant-pressure trapping plugging tool and a plugging method for a well drilling.
Background
In the process of oil-gas development and drilling, because the compactness and the bearing capacity of the strata at different depths are different, part of drilling fluid can enter the stratum with loose compactness to form a leakage layer, the stratum of the leakage layer is polluted by the drilling fluid, the oil-gas yield at the later stage can be influenced, the drilling fluid is wasted due to the leakage of the drilling fluid, and the drilling time is delayed. The drilling work can be continued only after the lost circulation zone is blocked.
The packer is a commonly used well drilling plugging tool, and mainly utilizes a rubber cylinder to be compressed so as to plug a well hole, the rubber cylinder of the existing packer mainly adopts a single-layer structure formed by a single rubber cylinder and a multi-layer structure formed by overlapping a plurality of rubber cylinders, wherein the single-layer structure has small sealing length range, small compression deformation of the rubber cylinder and poor sealing effect; in order to ensure that adjacent rubber cylinders are attached more tightly, a preset pressing force needs to be applied during assembly of the packer with the multilayer structure, so that the installation of a shear pin is not facilitated, and the number of the rubber cylinders to be assembled is increased, so that the assembly process is more complicated; on the other hand, the structure that current packer is used for the seat to hang fixedly adopts individual slips usually, arranges the slips at center tube week side along the circumference during the equipment, for preventing that the slips from dropping, need add the holder in the outside of slips to holder inner wall Xu Ya is according to the holding tank that the structure processing of slips suited, and this kind of structure not only can increase the cost of manufacture of packer because add the holder, but also because a plurality of independent slips lead to the assembly process complicated. Based on the above defects, a sealing tool which has a good sealing effect, is simple in structure and convenient to assemble and can effectively block the leakage of the leakage layer is needed.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a constant-pressure trapping and leaking stoppage tool and a leaking stoppage method for a drilling well, which have the advantages of good sealing effect, simple structure and convenience in assembly and can effectively perform leaking stoppage on a leaking layer.
In order to achieve the above purpose, the invention adopts the technical scheme that:
a constant-pressure trapping and leaking stoppage tool for drilling comprises a central pipe, wherein a through hole is formed in the middle of the central pipe, and the upper end of the central pipe is connected with an upper connector; the outer wall of the central tube is sequentially sleeved with a seat hanging mechanism, a rubber cylinder, a piston, a sealing ring and a guide shoe from top to bottom;
the seat hanging mechanism comprises an upper conical ring, a hanging ring and a lower conical ring which are arranged from top to bottom; the lower surface of the upper conical ring and the upper surface of the lower conical ring are conical surfaces, and the lower ends of the conical surfaces face the center of the central tube; the hanging ring is composed of a plurality of hanging blocks, and the upper end surface and the lower end surface of each hanging block are respectively matched with the lower surface of the upper conical ring and the upper surface of the lower conical ring; a first shearing screw is arranged between the lower conical ring and the central pipe;
the outer wall of the rubber cylinder is provided with an annular gap which evenly divides the outer wall of the rubber cylinder into a plurality of sections;
a second shear screw is arranged between the upper part of the piston and the central pipe; a cylinder sleeve is arranged outside the valve body, and the lower part of the cylinder sleeve is connected with the upper part of the guide shoe; an oil hole is formed in the central pipe, a drilling fluid flow passage is arranged between the piston and the sealing ring, and the oil hole is communicated with the drilling fluid flow passage;
the drilling fluid anti-leakage valve is characterized in that a valve body for preventing drilling fluid from flowing out is arranged on the lower portion of the through hole in the central tube, the top of the valve body is lower than the oil hole, and a third shearing screw is arranged between the valve body and the inner wall of the central tube.
As a better implementation scheme, the hanging ring is divided into a plurality of hanging blocks through a plurality of slitting grooves, and the inner walls of the hanging blocks are connected into a whole; the upper end face and the lower end face of the seat hanging block are provided with guide strips, guide grooves are formed in the lower surface of the upper conical ring and the upper surface of the lower conical ring, and the guide strips are matched with the guide grooves.
As a better embodiment, a rubber cylinder cushion is arranged between the rubber cylinder and the piston, and the lower end of the rubber cylinder cushion is matched with the upper end of the piston and the upper end of the cylinder sleeve.
As a better implementation scheme, an annular groove is formed in the inner wall corresponding to the outer wall of each section of the rubber cylinder, and the annular groove is in the shape of an isosceles triangle with the vertex angle facing the outer wall of the rubber cylinder.
As a preferred embodiment, a lock ring with unidirectional sawtooth threads with upward sawteeth on both surfaces is arranged between the upper part of the piston and the upper part of the cylinder sleeve, and the lock ring is in a C-shaped axial projection; and the outer surface of the upper part of the piston and the inner surface of the upper part of the cylinder sleeve are both provided with unidirectional sawtooth threads with sawtooth downwards; the inner wall of the locking ring is meshed with the outer surface of the piston, and the outer wall of the locking ring is not completely meshed with the inner wall of the cylinder sleeve.
As a preferred embodiment, a connecting ring is arranged between the sealing ring and the guide shoe, the lower end surface of the connecting ring and the upper end surface of the guide shoe are both conical surfaces, and the two conical surfaces are matched; the connecting ring is provided with a through hole, and the guide shoe is provided with a blind hole which does not penetrate through the bottom; the lower part of the cylinder sleeve is matched with the outer wall of the connecting ring and the upper part of the guide shoe.
As a preferred embodiment, the outer wall of the guide shoe is provided with a guide ring, and the lower end surface of the guide ring is a conical surface.
As a preferred embodiment, a first step bank and a second step bank are arranged on the inner wall of the central tube, and the upper end of the valve body is abutted against the first step bank; and the lower part of the valve body is provided with a bulge matched with the second step sill.
As a better embodiment, the valve body comprises a valve core, a backing ring and a shearing seat which are communicated with each other from top to bottom; the upper end and the lower end of the valve core are respectively provided with a conical surface, an upper plugging ball and a lower plugging ball are respectively arranged in the upper conical surface and the lower conical surface, and the lower end of the lower plugging ball is connected with a spring; and a third shearing screw is arranged between the shearing seat and the inner wall of the central pipe.
A leakage stoppage method of a constant-pressure well-drilling trap leakage stoppage tool comprises the following steps:
s1: connecting the plugging tool with the lower end of a drill rod, and lowering the plugging tool to a preset position above a leakage layer by using the drill rod;
s2: injecting drilling fluid, arranging an upper plugging ball at the upper end of the valve body, and closing the valve body;
s3: injecting drilling fluid to enable the seat hanging block to move outwards along the circumference and to be in contact with the inner wall of the borehole;
s4: continuously pressurizing to ensure that the outer wall of the rubber cylinder is attached to the inner wall of the well hole;
s5: continuously pressurizing to separate the valve body from the central pipe;
s6: and injecting a plugging agent to complete plugging.
The invention has the beneficial effects that:
(1) The invention provides a constant-pressure trapping and leaking stoppage tool for drilling, which has a good sealing effect, is simple in structure and is convenient to assemble.
(2) The packing element is monolithic structure, and it is more convenient to assemble, sets up annular breach along the circumference at its outer wall, makes to form multilayer seal structure between packing element outer wall and the well to through the compression space of the multiplicable packing element of processing annular breach, with the increase compression volume, effectively improve sealed effect.
(3) The hanging rings of the integrated structure are formed by the plurality of hanging blocks, a retainer is not required to be additionally arranged, the stable mounting structure of the hanging blocks can be ensured, and the hanging rings are only required to be sleeved outside the central tube, so that the assembling is more convenient.
(4) The invention provides a leakage stoppage method of a constant-pressure trapping leakage stoppage tool for drilling, which is simple to operate and can effectively ensure the leakage stoppage effect.
Drawings
Fig. 1 is a structural sectional view of a plugging tool of the present invention in an initial state;
FIG. 2 is an enlarged partial view A of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged partial view B of FIG. 1 in accordance with the present invention;
FIG. 4 is an enlarged partial view C of FIG. 1 of the present invention;
FIG. 5 is a sectional view of the valve body structure of the present invention;
FIG. 6 is a cross-sectional view of the construction of the lost circulation tool of the present invention in use;
FIG. 7 is an enlarged partial view D of FIG. 6 of the present invention;
FIG. 8 is an enlarged partial view E of FIG. 6 of the present invention;
FIG. 9 is a schematic view of the locking ring structure of the present invention;
FIG. 10 is a cross-sectional view of the construction of a preferred embodiment of the glue cartridge of the present invention in its initial state;
FIG. 11 is a cross-sectional view of a preferred embodiment of the glue cartridge of the present invention in use;
FIG. 12 is a schematic view of an upper cone ring structure of the present invention;
FIG. 13 is a schematic view of a suspension loop structure according to the present invention;
FIG. 14 is a schematic view of a lower cone ring structure of the present invention.
In the figure: 1. a central tube; 101. an oil hole; 2. a seat hanging mechanism; 201. an upper conical ring; 202. hanging a ring; 203. a lower conical ring; 204. a seat hanging block; 205. cutting grooves; 206. a guide groove; 207. a guide strip; 3. a rubber cylinder; 4. a piston; 401. a drilling fluid flow passage; 5. a seal ring; 6. guiding a shoe; 601. blind holes; 7. a cylinder liner; 8. a valve body; 801. a valve core; 802. a backing ring; 803. a shearing seat; 804. an upper plugging ball; 805. a lower plugging ball; 806. a spring; 9. a first shear screw; 10. an annular gap; 11. a second shear screw; 12. an annular groove; 13. a third shear screw; 14. an upper joint; 15. a rubber cylinder pad; 16. a locking ring; 17. a guide ring; 18. a connecting ring; 1801. a through hole; 19. a circular ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 14, the embodiment provides a constant-pressure drilling trapping and plugging tool, which includes a central tube 1, wherein a through hole is formed in the middle of the central tube 1, and the upper end of the central tube 1 is connected to an upper joint 14; the drilling fluid plugging device is connected with a drill rod through an upper joint 14, drilling fluid or plugging agent is injected into a central tube 1 through the drill rod, and a seat hanging mechanism 2, a rubber cylinder 3, a piston 4, a sealing ring 5 and a guide shoe 6 are sequentially sleeved on the outer wall of the central tube 1 from top to bottom;
the seat hanging mechanism 2 comprises an upper conical ring 201, a hanging ring 202 and a lower conical ring 203 which are arranged from top to bottom; the lower surface of the upper conical ring 201 and the upper surface of the lower conical ring 203 are conical surfaces with the lower ends facing the center of the central tube 1; the hanging ring 202 is composed of a plurality of hanging blocks 204, and the upper end surface and the lower end surface of each hanging block 204 are respectively matched with the lower surface of the upper conical ring 201 and the upper surface of the lower conical ring 203; a first shear screw 9 is arranged between the lower conical ring 203 and the central tube 1; it should be noted that the shearing force that the first shearing screw 9 can bear is smaller than the force required for the compression deformation of the rubber cylinder 3, that is, the rubber cylinder 3 is still in an uncompressed state after the first shearing screw 9 is cut.
The outer wall of the rubber cylinder 3 is provided with annular notches 10 which divide the outer wall of the rubber cylinder 3 into a plurality of sections uniformly; the annular gap 10 is provided with at least one position along the length direction of the packing element 3, so that the outer wall of the packing element 3 forms a multi-section structure, and the outer wall of the packing element 3 is in a multi-layer sealing structure when compressed, thereby improving the sealing effect on a well hole.
A second shear screw 11 is arranged between the upper part of the piston 4 and the central pipe 1; a cylinder sleeve 7 is arranged outside the valve body 8, and the lower part of the cylinder sleeve 7 is connected with the upper part of the guide shoe 6; an oil hole 101 is formed in the central pipe 1, a drilling fluid flow channel 401 is arranged between the piston 4 and the sealing ring 5, and the oil hole 101 is communicated with the drilling fluid flow channel 401; it is worth to say that the piston 4 is connected with the lower part of the cylinder sleeve 7 in a sealing way, so that the drilling fluid is prevented from leaking outwards; when the drilling fluid flows into the through hole of the central tube 1, the drilling fluid flows into the drilling fluid flow passage 401 through the oil hole 101, an upward acting force is applied to the piston 4, the second shear screw 11 is cut off, and the piston 4 moves upward.
The lower part of the through hole in the center tube 1 is provided with a valve body 8 for preventing drilling fluid from flowing out, the top of the valve body 8 is lower than the oil hole 101, and a third shear screw 13 is arranged between the valve body 8 and the inner wall of the center tube 1.
When the drilling fluid feeding device is used, drilling fluid is injected into the central tube 1, and enters the drilling fluid flow channel 401 through the oil hole 101 to provide upward acting force for the piston 4, and at the moment, the second shearing screw 11 is cut off, so that the piston 4 moves upwards smoothly. The piston 4 pushes the rubber tube 3 to move upwards, under the thrust action of the rubber tube 3, the first shear screw 9 is cut off, the lower conical ring 203 pushes the hanging ring 202 upwards, each seat hanging block 204 in the hanging ring 202 moves outwards along the circumference until being in contact with the wall of the well hole, and the plugging tool is coaxially positioned in the well. The piston 4 moves upwards continuously to make the rubber cylinder 3 expand under pressure, and the outer wall of the rubber cylinder 3 is attached to the inner wall of the well hole to form sealing. The central tube 1 is filled with drilling fluid continuously, the piston 4 stops moving, and after the pressure in the central tube 1 reaches a preset value, the third shear screw 13 is cut off, so that the valve body 8 is separated downwards from the central tube 1.
Example 2
As shown in fig. 1 to 14, the present embodiment is developed on the basis of the above embodiments, and specifically, the present embodiment provides a constant pressure well-drilling trap plugging tool, as shown in fig. 12 to 14, the hanging ring 202 is divided into a plurality of seat hanging blocks 204 by a plurality of dividing grooves 205, and the inner walls of the seat hanging blocks 204 are connected into a whole; the upper end face and the lower end face of the seat hanging block 204 are provided with guide strips 207, guide grooves 206 are formed in the lower surface of the upper conical ring 201 and the upper surface of the lower conical ring 203, and the guide strips 207 are matched with the guide grooves 206. It should be noted that the slit groove 205 penetrates through the outer side wall and two end faces of the suspension loop 202, and only the inner wall of the suspension loop 202 with a predetermined thickness connects the plurality of seat suspension blocks 204, and under the action of the drilling fluid, after the first shear screw 9 is cut off, the lower conical ring 203 pushes the suspension loop 202 upwards, so that the suspension loop 202 is cut off from the slit groove 205 to form a plurality of seat suspension blocks 204. The two end faces of each seat hanging block 204 are provided with guide strips 207 along the normal direction of the hanging ring 202, the corresponding guide strips 207 on the end faces of the upper conical ring 201 and the lower conical ring 203 facing the hanging ring 202 are provided with guide grooves 206 along the normal direction, and the guide strips 207 are arranged in the corresponding guide grooves 206 in a sliding manner. So that the relative positions of the upper conical ring 201, the lower conical ring 203 and the hanging ring 202 along the circumference are kept fixed, the rotation between the upper conical ring and the lower conical ring is prevented, and each seat hanging block 204 can be ensured to move along the preset direction, thereby ensuring the seat hanging effect. The seat hanging blocks 204 are pushed out by the extrusion force of the upper conical ring 201 and the lower conical ring 203, so that the arc outer walls of the seat hanging blocks 204 are coaxial with the central pipe 1, the plugging tool is positioned at the axial position of the well hole, the rubber cylinder 3 has more balanced sealing pressure with all parts of the circumference of the well hole, and the sealing effect of all parts of the circumference is ensured to be the same.
As a preferred embodiment, a rubber cylinder pad 15 is arranged between the rubber cylinder 3 and the piston 4, and the lower end of the rubber cylinder pad 15 is matched with the upper end of the piston 4 and the upper end of the cylinder sleeve 7.
As a preferred embodiment, as shown in fig. 10 to 11, an annular groove 12 is formed in an inner wall corresponding to an outer wall of each section of the rubber cylinder 3, and the annular groove 12 is an isosceles triangle with a vertex angle facing the outer wall of the rubber cylinder 3. The annular groove 12 is processed on the inner wall of the rubber cylinder 3, so that the rubber cylinder 3 has a larger compression space, the diameter of the rubber cylinder 3 after expansion is larger, the diameter range of the plugging tool adapting to a borehole is larger, and the tensioning pressure is larger when the plugging tool is used for boreholes with the same diameter, so that the sealing effect is improved. Moreover, the section of the annular groove 12 is designed to be an isosceles triangle structure, so that solid parts on two sides of the annular groove 12 are more uniformly pressed and are more regularly expanded and protruded towards the circumference. Further preferably, at least two rings 19 are embedded in the inner wall of the rubber tube 3, the outer diameter of each ring 19 is smaller than or equal to the inner diameter of the inner hole of the rubber tube 3, the rings 19 are located at both ends or the middle part of the rubber tube 3 and are adjacent to the ring grooves 12, one ring notch 10 is provided in this embodiment, the outer wall of the rubber tube 3 is divided into two sections, and one ring groove 12 is provided in each section corresponding to the inside of the rubber tube 3, so that the two ring grooves 12 divide the inner wall of the rubber tube 3 into three sections, in this embodiment, the rings 19 are embedded in both ends of the inner wall of the rubber tube 3, so as to keep the rubber tube 3 coaxial with the central tube 1, and the part of the inner wall of the rubber tube 3 where the ring 19 is not installed is attached to the outer wall of the central tube 1 during compression, so as to form a seal, and prevent leakage between the inner wall of the rubber tube 3 and the central tube 1.
As a preferred embodiment, as shown in fig. 8 and 9, a locking ring 16 with one-way sawtooth threads with upward sawteeth on both sides is arranged between the upper part of the piston 4 and the upper part of the cylinder sleeve 7, and the locking ring 16 is in a C shape along the axial projection; and the outer surface of the upper part of the piston 4 and the inner surface of the upper part of the cylinder sleeve 7 are both provided with one-way sawtooth threads with downward sawteeth; the inner wall of the lock ring 16 engages with the outer surface of the piston 4, and the outer wall of the lock ring 16 does not fully engage with the inner wall of the cylinder liner 7. During assembly, the one-way sawtooth threads on the inner wall of the locking ring 16 are attached to the one-way sawtooth threads on the outer wall of the piston 4, and a gap is reserved between the one-way sawtooth threads on the outer wall of the locking ring 16 and the one-way sawtooth threads on the inner wall of the cylinder sleeve 7. When the piston 4 moves upwards, the locking ring 16 cannot move upwards together with the piston 4 under the limiting effect of the one-way sawtooth thread of the cylinder sleeve 7, the locking ring 16 expands outwards along the circumference through the sliding of the one-way sawtooth thread conical surface in the process that the piston 4 moves upwards, and after the piston 4 rises to a preset position, the limiting can be realized by the one-way sawtooth thread between the piston 4 and the locking ring 16, the piston 4 is prevented from sliding downwards, so that the seat hanging block 204 is always in a seat hanging state, and the rubber cylinder 3 is always kept in a compression state.
As a preferred embodiment, as shown in fig. 4, a connecting ring 18 is arranged between the sealing ring 5 and the guide shoe 6, and the lower end surface of the connecting ring 18 and the upper end surface of the guide shoe 6 are both conical surfaces which are matched; a through hole 1801 is formed in the connecting ring 18, and a blind hole 601 which does not penetrate through the bottom is formed in the guide shoe 6; the lower part of the cylinder sleeve 7 is matched with the outer wall of the connecting ring 18 and the upper part of the guide shoe 6. It should be noted that a connecting ring 18 is arranged between the sealing ring 5 and the guide shoe 6, the inner wall of the connecting ring 18 is connected to the outer wall of the central tube 1 through a screw thread, the outer wall of the connecting ring 18 is connected to the inner wall of the cylinder sleeve 7 through a screw thread, and the central tube 1 and the cylinder sleeve 7 are connected through the connecting ring 18, so that the central tube 1 and the cylinder sleeve 7 are coaxial. Because all pass through threaded connection between center tube 1 and cylinder liner 7 and the go-between 18, because the coaxial precision between the mutual connection piece of the helicitic texture be not convenient for control, consequently lead to the coaxial precision between center tube 1 and the cylinder liner 7 lower easily, and cause the coaxial precision between piston 4 and sealing ring 5 and cylinder liner 7 and the center tube 1 to correspondingly reduce to influence the sealed effect of piston 4 and sealing ring 5 week side, there is the risk of leaking drilling fluid. The machining and installation accuracy between the inner hole of the guide shoe 6 and the outer wall of the central tube 1 is improved, so that the inner hole of the guide shoe 6 and the central tube 1 are in a high-accuracy coaxial state, then the conical surface at the upper end of the guide shoe 6 is matched with the conical surface at the lower end of the connecting ring 18 during assembly, the connecting ring 18 is kept coaxial with the inner hole of the guide shoe 6, and then the coaxial accuracy between the cylinder sleeve 7 and the central tube 1 is improved by the connecting ring 18. The connecting ring 18 is provided with a plurality of through holes 1801 along a circumferential array, and the axes of the through holes 1801 are parallel to the axis of the connecting ring 18. The upper end of the guide shoe 6 is provided with a plurality of blind holes 601 along the axial direction, and the blind holes 601 are arranged in a circumferential array; after plugging is completed, the plugging tool needs to be drilled in a drilling mode, the solid allowance of the plugging tool during drilling and machining can be reduced by machining the through hole 1801 and the blind hole 601, so that the plugging tool can be drilled and removed conveniently, the blind hole 601 is machined on the guide shoe 6, and the purpose of preventing waste liquid in a well from flowing backwards into the plugging tool during plugging is achieved.
As a preferred embodiment, as shown in fig. 4, the outer wall of the guide shoe 6 is provided with a guide ring 17, and the lower end surface of the guide ring 17 is a conical surface. It is worth to be noted that the outer wall of the lower end of the guide ring 17 is a conical surface, when the plugging tool passes through the irregular part of the inner wall of the well, the guide ring 17 can be used for guiding the plugging tool to smoothly pass through, the guide ring 17 is connected with the guide shoe 6 through threads, the guide ring 17 with different outer diameters is required according to different inner diameters of the well, and the threaded connection mode is convenient for field replacement.
As a preferred embodiment, as shown in fig. 4, in order to prevent the valve body 8 from moving upwards, a first step threshold and a second step threshold are arranged on the inner wall of the central tube 1, and the upper end of the valve body 8 abuts against the first step threshold; and the lower part of the valve body 8 is provided with a bulge matched with the second step sill.
As a preferred embodiment, as shown in fig. 4 and 5, the valve body 8 includes a valve core 801, a backing ring 802 and a shear seat 803 which are communicated with each other from top to bottom; conical surfaces are arranged at the upper end and the lower end of the valve core 801, an upper blocking ball 804 and a lower blocking ball 805 are respectively arranged in the upper conical surface and the lower conical surface, and the lower end of the lower blocking ball 805 is connected with a spring 806; a third shear screw 13 is arranged between the shear seat 803 and the inner wall of the central tube 1. It should be noted that the bottom of the lower plugging ball 805 is provided with a spring 806 for lifting the lower plugging ball 805 upward, so that the lower plugging ball 805 keeps being attached to the inner wall of the conical surface at the lower end. In the process of putting the plugging tool into the well, the lower plugging ball 805 can be used for plugging the inner hole of the valve core 801 to prevent liquid in the well from entering the central tube 1, because the liquid in the well contains particle impurities, if a large amount of liquid enters the plugging tool, the inside of the plugging tool can be plugged or the oil hole 101 can be plugged, so that the plugging tool cannot work. In the early stage of plugging construction, drilling fluid needs to be injected into the well bore, and the drilling fluid needs to flow out downwards from the interior of the valve core 801, so that the pressure of the drilling fluid can be utilized to compress the spring 806, and the lower plugging ball 805 is opened. The conical surface at the upper end of the valve core 801 is used for matching with the upper plugging ball 804, when the plugging tool descends to a preset position in use, the upper plugging ball 804 can be thrown into a borehole through a drill rod, so that the valve core 801 is closed, and drilling fluid is prevented from flowing downwards. The outer walls of the upper plugging ball 804 and the lower plugging ball 805 are provided with rubber coating layers for improving the sealing effect.
Example 3
As shown in fig. 1 to 14, the present embodiment is developed on the basis of the above embodiments, and in particular, the present embodiment provides a method for plugging a constant pressure well-drilling trap plugging tool, which includes the following steps:
s1: connecting the plugging tool with the lower end of a drill rod, and lowering the plugging tool to a preset position above a leakage layer by using the drill rod; in order to ensure the plugging effect, the plugging tool can be lowered to a position 5-10 meters above the water leakage point.
S2: injecting drilling fluid, arranging an upper plugging ball 804 at the upper end of the valve body 8, and closing the valve body 8; drilling fluid is injected into the central tube 1 through the drill pipe and then acts as an upper plugging ball 804 in the well, causing the valve body 8 to close.
S3: injecting drilling fluid to enable the seat hanging block 204 to move outwards along the circumference and to be in contact with the inner wall of the borehole; drilling fluid enters the central tube 1, enters the drilling fluid flow passage 401 through the oil hole 101, and provides upward acting force for the piston 4, at the moment, the second shearing screw 11 is cut off, the piston 4 moves upwards, the piston 4 pushes the rubber cylinder 3 to move upwards, under the thrust action of the rubber cylinder 3, the first shearing screw 9 is cut off, the lower conical ring 203 pushes the hanging ring 202 upwards, so that the hanging ring 202 is separated from the slitting groove 205 into a plurality of hanging blocks 204, and each hanging block 204 moves outwards along the circumference under the pushing of the lower conical ring 203 until contacting with the borehole wall.
S4: continuously pressurizing to ensure that the outer wall of the rubber cylinder 3 is attached to the inner wall of the well hole; and the piston 4 continuously moves upwards to ensure that the rubber cylinder 3 is expanded under pressure, and the outer wall of the rubber cylinder 3 is attached to the inner wall of the well hole to form sealing.
S5: continuously pressurizing to separate the valve body 8 from the central tube 1; when the piston 4 stops moving and the pressure inside the central tube 1 reaches a predetermined value, the third shear screw 13 is cut off, thereby separating the valve body 8 downward from inside the central tube 1.
S6: and injecting a plugging agent, namely injecting the plugging agent from the interior of the drill rod, wherein the plugging agent accurately enters a leakage layer below the plugging tool, so that the leakage layer is accurately plugged, and plugging is completed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A constant-pressure trapping and leaking stoppage tool for drilling comprises a central tube (1), wherein a through hole is formed in the middle of the central tube (1), and the upper end of the central tube (1) is connected with an upper joint (14); the method is characterized in that: the outer wall of the central tube (1) is sequentially sleeved with a seat hanging mechanism (2), a rubber cylinder (3), a piston (4), a sealing ring (5) and a guide shoe (6) from top to bottom;
the seat hanging mechanism (2) comprises an upper conical ring (201), a hanging ring (202) and a lower conical ring (203) which are arranged from top to bottom; the lower surface of the upper conical ring (201) and the upper surface of the lower conical ring (203) are conical surfaces with the lower ends facing the center of the central tube (1); the hanging ring (202) is composed of a plurality of hanging blocks (204), and the upper end surface and the lower end surface of each hanging block (204) are respectively matched with the lower surface of the upper conical ring (201) and the upper surface of the lower conical ring (203); a first shear screw (9) is arranged between the lower conical ring (203) and the central pipe (1);
the outer wall of the rubber cylinder (3) is provided with annular notches (10) which divide the outer wall of the rubber cylinder (3) into a plurality of sections uniformly;
an oil hole (101) is formed in the central pipe (1), a drilling fluid flow channel (401) is arranged between the piston (4) and the sealing ring (5), and the oil hole (101) is communicated with the drilling fluid flow channel (401); a valve body (8) for preventing drilling fluid from flowing out is arranged at the lower part of the through hole in the central pipe (1), the top of the valve body (8) is lower than the oil hole (101), and a third shear screw (13) is arranged between the valve body (8) and the inner wall of the central pipe (1);
a second shear screw (11) is arranged between the upper part of the piston (4) and the central pipe (1); a cylinder sleeve (7) is arranged outside the valve body (8), and the lower part of the cylinder sleeve (7) is connected with the upper part of the guide shoe (6).
2. The constant pressure drilling trap plugging tool of claim 1, wherein: the hanging ring (202) is divided into a plurality of hanging blocks (204) through a plurality of dividing grooves (205), and the inner walls of the hanging blocks (204) are connected into a whole; the upper end face and the lower end face of the seat hanging block (204) are provided with guide strips (207), guide grooves (206) are formed in the lower surface of the upper conical ring (201) and the upper surface of the lower conical ring (203), and the guide strips (207) are matched with the guide grooves (206).
3. The constant pressure drilling trap plugging tool of claim 1, wherein: a rubber cylinder pad (15) is arranged between the rubber cylinder (3) and the piston (4), and the lower end of the rubber cylinder pad (15) is matched with the upper end of the piston (4) and the upper end of the cylinder sleeve (7).
4. The constant pressure drilling trap plugging tool of claim 1, wherein: every section all seted up ring channel (12) on the inner wall that the packing element (3) outer wall corresponds, ring channel (12) are the apex angle and move towards the isosceles triangle of packing element (3) outer wall.
5. The constant pressure drilling trap plugging tool of claim 1, wherein: a locking ring (16) with unidirectional sawtooth threads with upward sawteeth on both surfaces is arranged between the upper part of the piston (4) and the upper part of the cylinder sleeve (7), and the locking ring (16) is in a C shape along the axial projection; and the outer surface of the upper part of the piston (4) and the inner surface of the upper part of the cylinder sleeve (7) are both provided with unidirectional sawtooth threads with downward sawteeth; the inner wall of the locking ring (16) is meshed with the outer surface of the piston (4), and the outer wall of the locking ring (16) is incompletely meshed with the inner wall of the cylinder sleeve (7).
6. The constant pressure drilling trap plugging tool of claim 1, wherein: a connecting ring (18) is arranged between the sealing ring (5) and the guide shoe (6), the lower end surface of the connecting ring (18) and the upper end surface of the guide shoe (6) are both conical surfaces, and the two conical surfaces are matched; a through hole (1801) is formed in the connecting ring (18), and a blind hole (601) which does not penetrate through the bottom is formed in the guide shoe (6); the lower part of the cylinder sleeve (7) is matched with the outer wall of the connecting ring (18) and the upper part of the guide shoe (6).
7. The constant pressure drilling trap plugging tool of claim 1, wherein: the outer wall of the guide shoe (6) is provided with a guide ring (17), and the lower end surface of the guide ring (17) is a conical surface.
8. The constant pressure drilling trap plugging tool of claim 1, wherein: a first step bank and a second step bank are arranged on the inner wall of the central tube (1), and the upper end of the valve body (8) is abutted against the first step bank; and the lower part of the valve body (8) is provided with a bulge matched with the second step sill.
9. The constant-pressure drilling trap plugging tool of claim 1, wherein: the valve body (8) comprises a valve core (801), a backing ring (802) and a shearing seat (803) which are communicated with each other from top to bottom; the upper end and the lower end of the valve core (801) are respectively provided with a conical surface, an upper blocking ball (804) and a lower blocking ball (805) are respectively arranged in the upper conical surface and the lower conical surface, and the lower end of the lower blocking ball (805) is connected with a spring (806); and a third shearing screw (13) is arranged between the shearing seat (803) and the inner wall of the central pipe (1).
10. A plugging method of a constant pressure drilling trap plugging tool according to claims 1 to 9, characterized in that: the method comprises the following steps:
s1: connecting the plugging tool with the lower end of a drill rod, and lowering the plugging tool to a preset position above a leakage layer by using the drill rod;
s2: drilling fluid is injected, an upper plugging ball (804) is arranged at the upper end of the valve body (8), and the valve body (8) is closed;
s3: injecting drilling fluid to enable the seat hanging block (204) to move outwards along the circumference and to be in contact with the inner wall of the borehole;
s4: continuously pressurizing to ensure that the outer wall of the rubber cylinder (3) is attached to the inner wall of the well hole;
s5: continuously pressurizing to separate the valve body (8) from the central pipe (1);
s6: and injecting a plugging agent to complete plugging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310017227.6A CN115749671B (en) | 2023-01-06 | 2023-01-06 | Drilling constant-pressure trap plugging tool and plugging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310017227.6A CN115749671B (en) | 2023-01-06 | 2023-01-06 | Drilling constant-pressure trap plugging tool and plugging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115749671A true CN115749671A (en) | 2023-03-07 |
| CN115749671B CN115749671B (en) | 2023-05-09 |
Family
ID=85348339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310017227.6A Active CN115749671B (en) | 2023-01-06 | 2023-01-06 | Drilling constant-pressure trap plugging tool and plugging method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115749671B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118815409A (en) * | 2024-09-18 | 2024-10-22 | 中石化西南石油工程有限公司 | A drilling plugging packer |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4393929A (en) * | 1981-02-17 | 1983-07-19 | Ava International | Well packers and slip assemblies for use therewith |
| RU92460U1 (en) * | 2009-06-29 | 2010-03-20 | Общество с ограниченной ответственностью "ЭРДИ Тулз" | DEVICE FOR SEALING THE INTER-TUBE SPACE PAKER BIK-700 |
| CN203097816U (en) * | 2013-03-01 | 2013-07-31 | 北京德美高科科技有限责任公司 | Double-sealed plugging bridge plug device |
| CN104153738A (en) * | 2013-05-14 | 2014-11-19 | 四川海沃石油工程技术有限公司 | Blocking controlling and leaking stopping tool assembly and leaking stopping method applied to drilling engineering |
| CN105484696A (en) * | 2016-01-26 | 2016-04-13 | 新疆华油油气工程有限公司 | Recyclable blanking plug in oil tubing |
| CN206360680U (en) * | 2017-01-04 | 2017-07-28 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of double-throw ball blocking packer |
| US20170226815A1 (en) * | 2016-02-10 | 2017-08-10 | Dril-Quip, Inc. | Fully supported c-ring slip retention system |
| CN208633803U (en) * | 2018-08-31 | 2019-03-22 | 四川省威沃敦化工有限公司 | A kind of soluble bridge plug preventing premature setting |
| CN109973046A (en) * | 2017-12-27 | 2019-07-05 | 北京六合伟业科技股份有限公司 | ZFD type leak stopping system |
| CN211549641U (en) * | 2019-11-26 | 2020-09-22 | 宝鸡瑞林石油机电设备有限责任公司 | Bidirectional seat seal backflow-preventing packer |
| US20200370387A1 (en) * | 2018-04-27 | 2020-11-26 | China University Of Petroleum-Beijing | Casing hanger and annulus sealing device running tool for deepwater drilling, and method for using the same |
| US10914132B1 (en) * | 2019-10-26 | 2021-02-09 | Petro-King Energy Technology (Huizhou) Co., Ltd. | Large-diameter soluble bridge plug |
| CN114809980A (en) * | 2022-04-19 | 2022-07-29 | 大庆市亚盛油田技术开发有限公司 | Hydraulic temporary bridge plug |
| US20220349282A1 (en) * | 2019-09-16 | 2022-11-03 | Petrochina Company Limited | Permanent packer and extended gas lift method using permanent packer |
-
2023
- 2023-01-06 CN CN202310017227.6A patent/CN115749671B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4393929A (en) * | 1981-02-17 | 1983-07-19 | Ava International | Well packers and slip assemblies for use therewith |
| RU92460U1 (en) * | 2009-06-29 | 2010-03-20 | Общество с ограниченной ответственностью "ЭРДИ Тулз" | DEVICE FOR SEALING THE INTER-TUBE SPACE PAKER BIK-700 |
| CN203097816U (en) * | 2013-03-01 | 2013-07-31 | 北京德美高科科技有限责任公司 | Double-sealed plugging bridge plug device |
| CN104153738A (en) * | 2013-05-14 | 2014-11-19 | 四川海沃石油工程技术有限公司 | Blocking controlling and leaking stopping tool assembly and leaking stopping method applied to drilling engineering |
| CN105484696A (en) * | 2016-01-26 | 2016-04-13 | 新疆华油油气工程有限公司 | Recyclable blanking plug in oil tubing |
| US20170226815A1 (en) * | 2016-02-10 | 2017-08-10 | Dril-Quip, Inc. | Fully supported c-ring slip retention system |
| CN206360680U (en) * | 2017-01-04 | 2017-07-28 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | A kind of double-throw ball blocking packer |
| CN109973046A (en) * | 2017-12-27 | 2019-07-05 | 北京六合伟业科技股份有限公司 | ZFD type leak stopping system |
| US20200370387A1 (en) * | 2018-04-27 | 2020-11-26 | China University Of Petroleum-Beijing | Casing hanger and annulus sealing device running tool for deepwater drilling, and method for using the same |
| CN208633803U (en) * | 2018-08-31 | 2019-03-22 | 四川省威沃敦化工有限公司 | A kind of soluble bridge plug preventing premature setting |
| US20220349282A1 (en) * | 2019-09-16 | 2022-11-03 | Petrochina Company Limited | Permanent packer and extended gas lift method using permanent packer |
| US10914132B1 (en) * | 2019-10-26 | 2021-02-09 | Petro-King Energy Technology (Huizhou) Co., Ltd. | Large-diameter soluble bridge plug |
| CN211549641U (en) * | 2019-11-26 | 2020-09-22 | 宝鸡瑞林石油机电设备有限责任公司 | Bidirectional seat seal backflow-preventing packer |
| CN114809980A (en) * | 2022-04-19 | 2022-07-29 | 大庆市亚盛油田技术开发有限公司 | Hydraulic temporary bridge plug |
Non-Patent Citations (2)
| Title |
|---|
| 景步宏;储明来;丁建林;吴富生;: "大裂缝性漏失堵漏新技术" * |
| 王文刚等: "井研–犍为地区缝洞型复杂地层钻井关键技术" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118815409A (en) * | 2024-09-18 | 2024-10-22 | 中石化西南石油工程有限公司 | A drilling plugging packer |
| CN118815409B (en) * | 2024-09-18 | 2025-01-24 | 中石化西南石油工程有限公司 | A drilling plugging packer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115749671B (en) | 2023-05-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3527297A (en) | Stage cementer | |
| CN111206899B (en) | Spring-driven step-by-step axial extrusion throttling device with double rubber cylinders | |
| CN112177565B (en) | Salvaging type drilling-plug-free cementing well completion device | |
| CN115749671A (en) | Constant-pressure trapping and leaking stoppage tool and method for drilling | |
| US7699111B2 (en) | Float collar and method | |
| CN108386155B (en) | Double-eccentric integrated packer for water injection well of oil field | |
| CN105221136A (en) | Sieve tube early stage subsection water control and monitoring channeling integrated well completion tool | |
| CN205858228U (en) | Differential plugging while drilling circulating valve | |
| CN111706303A (en) | One-time multilayer gravel filling sand prevention process and filling sand prevention tool pipe column | |
| CN110617026A (en) | Downhole operation device and method | |
| CN112443290A (en) | Anchoring packing cement surface control device and well cementation tubular column comprising same | |
| CN106321035B (en) | Full well bore is prevented returning and is told layering water injection tubular column | |
| RU2021486C1 (en) | Packer | |
| US11982166B2 (en) | System for segmented simultaneous water injection and oil recovery through double pipes in horizontal section | |
| RU2749366C1 (en) | Hydraulic packer | |
| CN113482569B (en) | Multistage disconnect-type grout leaking stoppage instrument | |
| CN117948083A (en) | Stage cementing device and stage cementing method | |
| CN113833430B (en) | Unidirectional sealing structure | |
| CN110671066B (en) | Oil Float Valve for Oil Drilling | |
| CN111322434B (en) | A bypass type spherical float valve | |
| CN109973044B (en) | Metal sealing pair packer | |
| CN113914819A (en) | A hydraulic sliding sleeve for fracturing | |
| CN117722154B (en) | Bypass open hole packer for horizontal well sub-bin filling | |
| CN219509605U (en) | An anchoring device for soluble variable-diameter tubing | |
| CN114320227B (en) | Full latus rectum pressure ball seat that passes after can shearing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |