CN114427358A - Sand washing device applied to oil well to be repaired and driven by workover rig - Google Patents
Sand washing device applied to oil well to be repaired and driven by workover rig Download PDFInfo
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- CN114427358A CN114427358A CN202011184371.1A CN202011184371A CN114427358A CN 114427358 A CN114427358 A CN 114427358A CN 202011184371 A CN202011184371 A CN 202011184371A CN 114427358 A CN114427358 A CN 114427358A
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- 239000004576 sand Substances 0.000 title claims abstract description 172
- 238000005406 washing Methods 0.000 title claims abstract description 141
- 239000003129 oil well Substances 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000011261 inert gas Substances 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 11
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a sand washing device which is applied to an oil well to be repaired and can be driven by a workover rig, and the sand washing device comprises a sand washing head and a pipe column used for sending the sand washing head into the bottom of the oil well to be repaired and arranging the sand washing head at the bottom of the oil well to be repaired, wherein the pipe column comprises an inner pipe and an outer pipe, the inner pipe shrinks the radial dimension of the pipe column from top to bottom in a continuous or discontinuous mode, the outer pipe shrinks the radial dimension of the pipe column from top to bottom in a continuous or discontinuous mode, a core cavity is arranged in the inner pipe, an annular cavity is arranged between the inner pipe and the outer pipe, the lower end of the inner pipe and/or the outer pipe is connected with the sand washing head, the core cavity can receive and provide sand washing liquid for the sand washing head so that the sand washing head carries out sand washing operation, and the annular cavity can receive and provide inert gas for the sand washing head, and the inert gas is mixed with the sand washing liquid outside the sand washing head. The sand washing device can reduce the requirements on the load capacity, the output torque and the sand washing liquid pumping pressure of the driving equipment, and allows a workover rig with lower cost to be used for driving the drive equipment to complete sand washing operation.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to a sand washing device which is applied to an oil well to be repaired and can be driven by a workover rig.
Background
In the production process of an oil well, because stratum sand and fine particles are produced from the stratum, an oil outlet channel is blocked, the productivity of the oil well is gradually reduced, even production is stopped, and meanwhile, underground equipment is damaged to cause an underground blocking accident. In order to recover the yield of the oil well, the sand washing liquid flowing at high speed is used for washing away sand plugs at the bottom of the well, fluid circulation is established between the space in the pipe column and the pipe column-casing annular space, and the washed away sand is carried out of the ground by the upward returning capacity of the fluid circulation, namely sand washing operation.
In the existing sand washing operation process of an oil well, a sand washing device consisting of a hollow pipe column and a sand washing head is commonly used, but the required pipe column length is increased along with the increase of the well depth, the self weight of the pipe column is increased, and the comprehensive requirements on driving equipment are increased along with the increase of the pipe column, so that the workover rig which is low in cost, low in load capacity, low in output torque and low in sand washing liquid pumping pressure is difficult to apply, and is forced to be implemented by a drilling rig which is high in use cost, high in load capacity, high in output torque and high in sand washing liquid pumping pressure. Therefore, in order to realize low-cost sand washing, how to improve the sand washing device and make the sand washing device directly driven by a workover rig becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
In order to solve all or part of the above problems, it is an object of the present invention to provide a sand washing apparatus for use in a well to be repaired and drivable by a workover rig, which can reduce the load capacity, output torque and sand washing fluid pumping pressure requirements on the driving equipment to allow the use of a less expensive workover rig to drive it to perform a sand washing operation.
The invention provides a sand washing device which is applied to an oil well to be repaired and can be driven by a workover rig, and the sand washing device comprises a sand washing head and a conveying pipe column thereof, wherein the conveying pipe column comprises an inner pipe and an outer pipe, the inner pipe is shrunk in a continuous or discontinuous mode from top to bottom, the inner pipe is internally provided with a core cavity, an annular cavity is formed between the inner pipe and the outer pipe, the lower end of the inner pipe and/or the outer pipe is connected with the sand washing head, the core cavity can receive sand washing liquid and provide the sand washing liquid for the sand washing head, so that the sand washing head can carry out sand washing operation, and the annular cavity can receive and provide inert gas for the sand washing head and mix the inert gas with the sand washing liquid outside the sand washing head.
Further, the sand washing machine also comprises a first one-way valve which is arranged in the core cavity and is adjacent to the sand washing head, and the first one-way valve can allow sand washing liquid to flow through the sand washing head from top to bottom.
Further, a second one-way valve is arranged in the annular cavity and adjacent to the sand washing head, and the second one-way valve can allow inert gas to flow through the sand washing head from top to bottom.
Further, the radial dimensions of the inner pipe and the outer pipe are synchronously shrunk in an intermittent mode from top to bottom, and the inner pipe and the outer pipe respectively comprise a first section, a second section and a third section which are sequentially connected from top to bottom and the radial dimensions of which are sequentially reduced.
Further, the outer pipe and the inner pipe are both made of S135 steel.
Further, the inner diameter of the first section of the inner pipe is 0.360-0.364 times of the inner diameter of the casing of the oil well to be repaired, the wall thickness is 0.043-0.047 times of the inner diameter of the casing, and the length is 1400-1600 m; the inner diameter of the second section of the inner pipe is 0.308-0.312 times of the inner diameter of the sleeve, the wall thickness of the second section of the inner pipe is 0.037-0.041 times of the inner diameter of the sleeve, and the length of the second section of the inner pipe is 2400-2600 m; the inner diameter of the third section of the inner tube is 0.184-0.188 times of the inner diameter of the sleeve, the wall thickness of the third section of the inner tube is 0.034-0.038 times of the inner diameter of the sleeve, and the length of the third section of the inner tube is 3900-4100 m; the inner diameter of the first section of the outer pipe is 0.693-0.689 times of the inner diameter of the sleeve pipe, the wall thickness of the first section of the outer pipe is 0.063-0.067 times of the inner diameter of the sleeve pipe, and the length of the first section of the outer pipe is 1400m-1600m m; the inner diameter of the second section of the outer tube is 0.536-0.540 times of the inner diameter of the sleeve, the wall thickness is 0.057-0.061 times of the inner diameter of the sleeve, and the length is 2400-2600 m; the inner diameter of the third section of the outer tube is 0.452-0.456 times of the inner diameter of the sleeve, the wall thickness is 0.058-0.062 times of the inner diameter of the sleeve, and the length is 3900-4100 m.
Further, the inner diameter of the first section of the inner tube is 0.362 times the inner diameter of the sleeve, the wall thickness is 0.045 times the inner diameter of the sleeve, and the length is 1500 m; the inner diameter of the second section of the inner tube is 0.310 times the inner diameter of the sleeve, the wall thickness is 0.039 times the inner diameter of the sleeve, and the length is 2500 m; the inner diameter of the third section of the inner tube is 0.187 times the inner diameter of the sleeve, the wall thickness is 0.036 of the inner diameter of the sleeve, and the length is 4000 m; the inner diameter of the first section of the outer tube is 0.691 times the inner diameter of the sleeve, the wall thickness is 0.065 times the inner diameter of the sleeve, and the length is 1500 m; the inner diameter of the second section of the outer tube is 0.538 times the inner diameter of the sleeve, the wall thickness is 0.059 of the inner diameter of the sleeve, and the length is 2500 m; the third section of the outer tube has an inner diameter of 0.454 times the inner diameter of the sleeve, a wall thickness of 0.060 times the inner diameter of the sleeve, and a length of 4000 m.
Further, the sand flushing head is a roller bit or a polycrystalline diamond compact bit.
And the upper end of the inner pipe and the upper end of the outer pipe can be connected with an off-well workover rig through the wellhead joint, and the workover rig can drive the pipe column and the sand washing head to synchronously rotate.
Further, the wellhead sub includes a first passage for connecting the core chamber of the tubing string to a sand wash supply system, and a second passage for connecting the annulus chamber of the tubing string to an inert gas supply system, wherein the inert gas is nitrogen.
According to the technical scheme, the sand washing device which is applied to an oil well to be repaired and can be driven by the workover rig is characterized in that a pipe column is changed into a double-layer structure formed by an inner pipe and an outer pipe, the radial dimension of the sand washing device is gradually contracted along the direction from top to bottom, the self weight of the sand washing device can be reduced, the accommodating volume of sand washing liquid in the sand washing device can be reduced, the requirements of the sand washing device on the load capacity and the output torque of driving equipment are effectively reduced, a solid foundation is laid for the workover rig to drive the sand washing device, the sand washing hydraulic pressure and the impact force when the sand washing device leaves a sand washing head can be improved through the tapered inner pipe, and the impact force is enough to disperse sand blockage. Although the pumping pressure of the sand washing liquid of the workover rig is not increased, the sand carrying lifting capacity of the sand washing liquid can be improved by sending the inert gas into the bottom of the well from the annular cavity between the outer pipe and the inner pipe, so that the sand carrying sand washing liquid can return to the ground to finish the sand washing operation. That is, the sand washing device reduces the requirements on the load capacity of the driving equipment, the output torque and the pumping pressure of the sand washing liquid, and allows a workover rig with lower cost to be used for driving the workover rig to complete the sand washing operation.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the figure:
FIG. 1 is a schematic structural diagram of a sand washing device which is applied to a well to be repaired and can be driven by a workover rig according to an embodiment of the invention;
in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic structural diagram of a sand washing device 100 which is applied to a well to be repaired and can be driven by a workover rig, according to an embodiment of the present invention, wherein the sand washing device 100 comprises a sand washing head 2 and a pipe string 1 for feeding and arranging the sand washing head 2 at the bottom of the well to be repaired, and a wellhead joint for connecting the pipe string 1 to the workover rig. The sand flushing head 2 is used for breaking sand blockage, and is suggested to be selected as a roller bit or a polycrystalline diamond compact bit, and the sand flushing head has the characteristics of good wear resistance, high temperature resistance and the like and is easy to improve the sand flushing effect. With the increase of the depth of the oil well to be repaired, the pipe column 1 can be lengthened by connecting a new pipe column 1, and then the sand washing head 2 is sent into the oil well to be repaired at a specific depth.
The pipe string 1 includes an inner pipe 11 and an outer pipe 12 fitted over the inner pipe 11, as well as a core chamber 3 formed inside the inner pipe 11 and an annular chamber 4 formed between the inner pipe 11 and the outer pipe 12. The radial dimension of the inner tube 11 is constricted continuously or intermittently from the top to the bottom, and the radial dimension of the outer tube 12 is also constricted continuously or intermittently from the top to the bottom. The upper end of the inner pipe 11 and/or the outer pipe 12 is connected with a workover rig, and the lower end is connected with the sand washing head 2, so that the workover rig can improve the sand carrying and lifting capacity of the sand washing liquid through the inner pipe 11, and the smooth and low-resistance implementation of sand washing operation is ensured. Therefore, the possibility of burying the pipe column 1 can be reduced, and the blocking accident can be prevented. The core cavity 3 can receive the sand washing liquid provided by the workover rig and provide the sand washing liquid to the sand washing head 2, so that the sand washing head 2 can carry out sand washing operation, and the ring cavity 4 can receive the inert gas provided by the workover rig and transport the inert gas to the periphery of the sand washing head 2, so that the inert gas can be mixed with the sand washing liquid outside the sand washing head 2.
According to the embodiment of the invention, the sand washing device 100 changes the pipe column 1 into a double-layer structure formed by the inner pipe 11 and the outer pipe 12, and the radial dimension of the pipe column is gradually contracted along the top-to-bottom direction, so that the self weight of the sand washing device 100 can be reduced, the accommodating volume of the inner sand washing liquid can be reduced, the requirements on the load capacity and the output torque of a driving device can be effectively reduced, a solid foundation is laid for the workover rig to drive the sand washing device 100, the impact force of the sand washing liquid when the sand washing liquid leaves the sand washing head 2 can be improved through the tapered inner pipe 11, the impact force is enough to break away sand blockage, although the pumping pressure of the sand washing liquid of the workover rig is not improved, the sand washing liquid carrying capacity can be improved through the inert gas sent to the bottom of the annular cavity 4 between the outer pipe 12 and the inner pipe 11, so that the sand washing liquid carrying capacity can return to the ground, and (5) finishing sand washing operation. That is, the sand wash apparatus 100 reduces the load capacity, output torque and wash fluid pumping pressure requirements of the drive equipment, allowing the use of a less expensive workover rig to drive it to perform a sand wash operation.
In this embodiment, the sand wash apparatus 100 further comprises a first one-way valve 5 disposed in the core chamber 3 adjacent (2 m or less) the sand wash head 2 and capable of permitting the sand wash fluid to flow from the top to the bottom therethrough to prevent fluid at the bottom of the well from flowing back into the core chamber 3 through the first one-way valve 5 and causing undesirable losses. Likewise, the sand wash apparatus 100 further comprises a second one-way valve 6 disposed within the annulus 4 adjacent (2 m or less) the sand wash head 2 and capable of permitting inert gas to flow from the top to the bottom therethrough to prevent fluid downhole from flowing back through the second one-way valve 6 into the annulus 4 and causing undesirable losses.
In the present embodiment, in order to reduce the manufacturing difficulty and the manufacturing cost, the radial dimensions of the inner tube 11 and the outer tube 12 are synchronously shrunk from top to bottom in an intermittent manner, and the inner tube 11 includes a first section 11a, a second section 11b and a third section 11c which are sequentially connected from top to bottom and have sequentially decreasing radial dimensions, and the outer tube 12 also includes a first section 12a, a second section 12b and a third section 12c which are sequentially connected from top to bottom and have sequentially decreasing radial dimensions. The outer pipe 12 and the inner pipe 11 are preferably made of S135 steel, and the material has high yield strength and good corrosion resistance, so that the service life of the pipe column 1 can be greatly prolonged.
Experiments show that when the inner pipe 11 and the outer pipe 12 are constructed according to the following parameters, the sand washing device 100 can further reduce the requirements on the load capacity, the output torque and the sand washing liquid pumping pressure of the workover rig, and further reduce the accident that the pipe column is stuck. That is, the first section 11a of the inner pipe 11 may have an inner diameter of 0.360-0.364 times the inner diameter of the casing 7 of the well to be repaired, a wall thickness of 0.043-0.047 times the inner diameter of the casing 7, and a length of 1400-1600 m. The second section 11b of the inner tube 11 may have an inner diameter of 0.308-0.312 times the inner diameter of the cannula 7, a wall thickness of 0.037-0.041 times the inner diameter of the cannula 7 and a length of 2400-2600 m. The third section 11c of inner tube 11 may have an inner diameter of 0.184-0.188 times the inner diameter of cannula 7, a wall thickness of 0.034-0.038 times the inner diameter of cannula 7, and a length of 3900-4100 m. The first section 12a of the outer tube 12 may have an inner diameter of 0.693-0.689 times the inner diameter of the sleeve 7, a wall thickness of 0.063-0.067 times the inner diameter of the sleeve 7 and a length of 1400m-1600 m. The second section 12b of the outer tube 12 may have an inner diameter of 0.536 to 0.540 times the inner diameter of the cannula 7, a wall thickness of 0.057 to 0.061 times the inner diameter of the cannula 7 and a length of 2400 to 2600 m. The third section 12c of the outer tube 12 may have an inner diameter of 0.452 to 0.456 times the inner diameter of the sleeve 7, a wall thickness of 0.058 to 0.062 times the inner diameter of the sleeve 7, and a length of 3900 to 4100 m.
When the inner and outer pipes 11, 12 are constructed according to the following parameters, the sand wash apparatus 100 can further reduce the load capacity, output torque and sand wash pumping pressure requirements for the workover rig and further reduce the risk of the tubular string 1 becoming stuck. The first section 11a of the inner tube 11 has an inner diameter which is 0.362 times the inner diameter of the sleeve 7, a wall thickness which is 0.045 times the inner diameter of the sleeve 7 and a length which is 1500 m. The second section 11b of the inner tube 11 has an inner diameter of 0.310 times the inner diameter of the sleeve 7, a wall thickness of 0.039 times the inner diameter of the sleeve 7 and a length of 2500 m. The third section 11c of the inner tube 11 has an inner diameter of 0.187 times the inner diameter of the sleeve 7, a wall thickness of 0.036 times the inner diameter of the sleeve 7 and a length of 4000 m. The first section 12a of the outer tube 12 has an inner diameter of 0.691 times the inner diameter of the sleeve 7, a wall thickness of 0.065 times the inner diameter of the sleeve 7 and a length of 1500 m. The second section 12b of the outer tube 12 has an inner diameter of 0.538 times the inner diameter of the sleeve 7 and a wall thickness of 0.059 times the inner diameter of the sleeve 7 and a length of 2500 m. The third section 12c of the outer tube 12 has an inner diameter of 0.454 times the inner diameter of the sleeve 7, a wall thickness of 0.060 times the inner diameter of the sleeve 7 and a length of 4000 m. That is, the selection of these parameters helps to reduce the overall mass of the string, allowing selection of a model with less power and lower cost when selecting a workover rig. Meanwhile, the blocking risk of the pipe column is reduced, the sand washing liquid flushing speed is increased, and the safety during output torque transmission is improved.
In this embodiment, the sand washing device 100 further comprises a wellhead joint, so that the upper end of the inner pipe 11 and the upper end of the outer pipe 12 can be connected with an outside workover rig through the wellhead joint, and the workover rig can more easily drive the pipe column 1 and the sand washing head 2 to synchronously rotate. Preferably, the wellhead joint comprises a first passage for connecting the core chamber 3 of the pipe string 1 to the sand wash supply system of the workover rig, and a second passage for connecting the annulus chamber 4 of the pipe string 1 to the inert gas supply system of the workover rig, wherein the inert gas is preferably nitrogen. After the supply system is started, sand washing liquid enters the core cavity 3 through the first channel, nitrogen enters the annular cavity 4 through the second channel, the sand washing liquid and the nitrogen are mixed outside the sand washing head 2 and return to the ground through the annular space 8, fluid circulation is established, and the purpose of sand washing is achieved. The sand washing liquid supply system and the inert gas supply system are well known products of those skilled in the art, and are not described herein again.
The following describes the sand washing operation of the sand washing apparatus 100 applied in the well to be repaired and driven by the workover rig according to the embodiment of the present invention:
and 2, lifting the sand washing device by 1m, starting the workover rig to drive the sand washing device to rotate, respectively supplying sand washing liquid and inert gas to the sand washing device 100 through a sand washing liquid supply system and an inert gas supply system, then lowering the sand washing device 10 after 5min, and carrying out sand washing operation by means of the sand washing device.
In summary, the sand washing device 100 can reduce the requirements on the load capacity, output torque and sand washing fluid pumping pressure of the driving equipment, and allows the application of a low-cost workover rig to drive the driving equipment to complete sand washing operation.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those 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 referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A sand washing device applied to an oil well to be repaired and driven by a workover rig is characterized by comprising a sand washing head and a pipe column used for conveying the sand washing head into the bottom of the oil well to be repaired and arranged, wherein the pipe column comprises an inner pipe and an outer pipe, the inner pipe shrinks the radial size of the inner pipe in a continuous or discontinuous mode from top to bottom, the outer pipe is sleeved outside the inner pipe and shrinks the radial size of the inner pipe in a continuous or discontinuous mode from top to bottom, a core cavity is arranged in the inner pipe, an annular cavity is arranged between the inner pipe and the outer pipe, the lower end of the inner pipe and/or the outer pipe is connected with the sand washing head, the core cavity can receive sand washing liquid and provide the sand washing liquid for the sand washing head so that the sand washing head can carry out sand washing operation, and the annular cavity can receive and provide inert gas for the sand washing head and enable the inert gas to be mixed with the sand washing liquid outside the sand washing head.
2. The sand wash apparatus of claim 1, further comprising a first one-way valve disposed within the core chamber adjacent the sand wash head and capable of permitting sand wash fluid to flow therethrough from top to bottom.
3. The sand wash apparatus of claim 1, further comprising a second one-way valve disposed within the annular chamber adjacent the sand wash head and capable of permitting inert gas to flow therethrough from top to bottom.
4. A sand washing device according to any one of claims 1-3, wherein the radial dimensions of the inner and outer tubes are synchronously contracted in an intermittent manner from top to bottom, and each of the inner and outer tubes comprises a first section, a second section and a third section which are sequentially connected from top to bottom and have sequentially decreasing radial dimensions.
5. A sand washing device according to claim 4, wherein the outer and inner tubes are both made of S135 steel.
6. A sand washing device according to claim 5, wherein:
the inner diameter of the first section of the inner pipe is 0.360-0.364 times of the inner diameter of the casing of the oil well to be repaired, the wall thickness of the first section of the inner pipe is 0.043-0.047 times of the inner diameter of the casing, and the length of the first section of the inner pipe is 1400-1600 m;
the inner diameter of the second section of the inner pipe is 0.308-0.312 times of the inner diameter of the sleeve, the wall thickness of the second section of the inner pipe is 0.037-0.041 times of the inner diameter of the sleeve, and the length of the second section of the inner pipe is 2400-2600 m;
the inner diameter of the third section of the inner tube is 0.184-0.188 times of the inner diameter of the sleeve, the wall thickness of the third section of the inner tube is 0.034-0.038 times of the inner diameter of the sleeve, and the length of the third section of the inner tube is 3900-4100 m;
the inner diameter of the first section of the outer pipe is 0.693-0.689 times of the inner diameter of the sleeve, the wall thickness of the first section of the outer pipe is 0.063-0.067 times of the inner diameter of the sleeve, and the length of the first section of the outer pipe is 1400-1600 mm;
the inner diameter of the second section of the outer tube is 0.536-0.540 times of the inner diameter of the sleeve, the wall thickness is 0.057-0.061 times of the inner diameter of the sleeve, and the length is 2400-2600 m;
the inner diameter of the third section of the outer tube is 0.452-0.456 times of the inner diameter of the sleeve, the wall thickness is 0.058-0.062 times of the inner diameter of the sleeve, and the length is 3900-4100 m.
7. A sand washing device according to claim 6,
the inner diameter of the first section of the inner pipe is 0.362 times of the inner diameter of the sleeve, the wall thickness of the first section of the inner pipe is 0.045 times of the inner diameter of the sleeve, and the length of the first section of the inner pipe is 1500 m;
the inner diameter of the second section of the inner tube is 0.310 times the inner diameter of the sleeve, the wall thickness is 0.039 times the inner diameter of the sleeve, and the length is 2500 m;
the inner diameter of the third section of the inner tube is 0.187 times the inner diameter of the sleeve, the wall thickness is 0.036 of the inner diameter of the sleeve, and the length is 4000 m;
the inner diameter of the first section of the outer tube is 0.691 times the inner diameter of the sleeve, the wall thickness is 0.065 times the inner diameter of the sleeve, and the length is 1500 m;
the inner diameter of the second section of the outer tube is 0.538 times the inner diameter of the sleeve, the wall thickness is 0.059 of the inner diameter of the sleeve, and the length is 2500 m;
the third section of the outer tube has an inner diameter of 0.454 times the inner diameter of the sleeve, a wall thickness of 0.060 times the inner diameter of the sleeve, and a length of 4000 m.
8. A sand washing device according to any one of claims 1 to 3, wherein the sand washing head is a roller cone drill bit or a polycrystalline diamond compact drill bit.
9. A sand washing device according to any one of claims 1 to 3, further comprising a wellhead connector, wherein the upper ends of the inner and outer pipes are connectable to an outside workover rig via the wellhead connector, and the workover rig is adapted to drive the pipe string and the sand washing head to rotate synchronously.
10. A sand wash device according to claim 9, wherein the wellhead fitting comprises a first passage for connecting the core chamber of the string to a sand wash supply system, and a second passage for connecting the annulus chamber of the string to an inert gas supply system, wherein the inert gas is nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184371.1A CN114427358A (en) | 2020-10-29 | 2020-10-29 | Sand washing device applied to oil well to be repaired and driven by workover rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011184371.1A CN114427358A (en) | 2020-10-29 | 2020-10-29 | Sand washing device applied to oil well to be repaired and driven by workover rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114427358A true CN114427358A (en) | 2022-05-03 |
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| CN202011184371.1A Pending CN114427358A (en) | 2020-10-29 | 2020-10-29 | Sand washing device applied to oil well to be repaired and driven by workover rig |
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Cited By (1)
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| CN115059423A (en) * | 2022-06-09 | 2022-09-16 | 西南石油大学 | Sand washing pressure compensation device |
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