CN212927766U - Reverse water hole shoe grinding tool - Google Patents
Reverse water hole shoe grinding tool Download PDFInfo
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- CN212927766U CN212927766U CN202021855416.9U CN202021855416U CN212927766U CN 212927766 U CN212927766 U CN 212927766U CN 202021855416 U CN202021855416 U CN 202021855416U CN 212927766 U CN212927766 U CN 212927766U
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Abstract
The utility model discloses a reverse flake milling tool, this instrument includes that upper portion connects in proper order, mill shoe tip end and mill shoe stub end, upper portion connects, mill shoe tip end and mill shoe stub end formula structure as an organic whole, set up to domatic changeover portion between mill shoe tip end and the mill shoe stub end, be provided with the chute on the mill shoe stub end, mill shoe stub end tip is provided with wear-resisting carbide, the instrument inner chamber is provided with main flake, be provided with reverse flake in the mill shoe stub end, reverse flake entry and main flake root intercommunication, the export is located domatic changeover portion. The utility model discloses a throttle effect and the injection fluid of reverse water hole provide along the thrust of shaft bottom direction go into in order to assist the tubular column, also can improve the annular space efficiency of washing simultaneously.
Description
Technical Field
The utility model relates to a reverse water hole grind shoe tool for the fracturing construction is accomplished the back and is led to the well and bore the mill operation and utilize hydraulic pressure to form along the thrust of shaft bottom direction, and the help tubular column goes into down, belongs to oil, natural gas well workover engineering field.
Background
Unconventional natural gas with low reservoir permeability, such as shale gas, can be industrially exploited only by corresponding yield-increasing modification measures. The bridge plug is used as the most widely used downhole tool in the staged fracturing process, the through-well drilling and grinding operation is usually required after fracturing is completed, and in the process of running a coiled tubing through-well pipe string, the running of the continuous oil is difficult due to buckling of the continuous oil, self-locking and blocking of drill cuttings. In addition, if the pipe column is stuck and the grinding shoe is stuck in the process of the through-well drilling and grinding operation, the construction period can be greatly influenced, and huge economic loss is caused.
A method of providing additional pipe string pull-in thrust by utilizing tool hydraulic pressure has not been addressed for the time being in response to the above-mentioned problems. At present, patents related to a shoe grinding tool mainly aim at improving a grinding and milling effect and a chip returning effect, and a shoe grinding structure with reverse water holes arranged on the tool is rarely available (although a flat-bottom shoe for continuous oil pipe drilling and grinding, disclosed by Chinese patent publication No. 204960850U, is designed with a side water hole, the flat-bottom shoe only can achieve the purpose of improving the upward returning capacity of drill cuttings), and a technology aiming at improving the thrust along the well bottom direction is not disclosed at present.
Disclosure of Invention
An object of the utility model is to overcome the above-mentioned problem that prior art exists, provide a reverse water hole grind shoes instrument. The utility model discloses a throttle effect and the injection fluid of reverse water hole provide along the thrust of shaft bottom direction go into in order to assist the tubular column, also can improve the annular space efficiency of washing simultaneously.
In order to achieve the above object, the utility model adopts the following technical scheme:
a reverse water eye tool for grinding shoes, which is characterized in that: this instrument includes the upper portion in proper order and connects, the little head end of mill shoe and the big head end of mill shoe, the upper portion connects, the little head end of mill shoe and the big head end of mill shoe formula structure as an organic whole, set up to domatic changeover portion between little head end of mill shoe and the big head end of mill shoe, the big head end of mill shoe is served and is provided with the chute, the big head end of mill shoe tip is provided with wear-resisting carbide, the instrument inner chamber is provided with main water hole, be provided with reverse water hole in the big head end of mill shoe, reverse water hole entry and main water hole root intercommunication, the export is located domatic changeover.
The reverse water hole comprises a straight section and an inclined section, the straight section is parallel to the central axis of the tool, an outlet in the straight section is located on the slope transition section, the straight section is communicated with the inclined section, an inlet in the inclined section is communicated with the root of the main water hole, and the straight section and the inclined section are combined to form a zero-angle reverse water hole.
The reverse water hole is in a straight hole shape to form a straight channel reverse water hole, and the included angle between the straight channel reverse water hole and the central axis of the tool is less than 45 degrees.
The upper part joint adopts a thread buckle matched with the screw motor, the small end of the milling shoe adopts the outer diameter size with the same size as the screw motor, and the inner diameter of the main water hole is the same as the inner diameter of the outlet end of the screw motor.
The drainage grooves are a plurality of and are uniformly distributed at the large head end of the grinding shoe, and the deepest part of the drainage grooves is tangent with the small head end of the grinding shoe.
The reverse water holes are multiple and are uniformly distributed in the circumferential direction of the tool.
Adopt the utility model has the advantages of:
1. on the basis of ensuring the drilling and grinding functions of the traditional grinding shoe, the reverse water hole grinding tool generates a throttling effect through the change of the flow area between the internal reverse water hole and the main water hole, so that the tool generates thrust along the direction of the well bottom.
2. Since the reverse port angle of the reverse port milling tool approaches the negative direction of the borehole direction, most of the dynamic pressure of the fluid ejected in the reverse port will also be converted into thrust of the string in the downhole direction.
3. Because the reverse water hole of reverse water hole mill shoe instrument is close the negative direction of well direction, especially the reverse water hole of zero degree angle, can fully improve the cleaning performance of annular space, improve the impact force to the annular space drill chip.
4. The reverse water holes of the reverse water hole shoe grinding tool can change the diameter, the angle and the number of the reverse water holes according to the required thrust and the requirement of site construction.
5. If the lower part of the reverse water hole shoe grinding tool is not provided with wear-resistant hard alloy but is changed into a corresponding joint, the tool can be changed into a simple pipe column auxiliary running and annular flushing nipple which is connected in series at any position in the middle of the tool string.
Drawings
FIG. 1 is a schematic view of the appearance structure of the present invention;
FIG. 2 is a schematic diagram of the right side view of the structure of FIG. 1;
FIG. 3 is a schematic view of the cross-sectional structure of the straight passage reverse port of the present invention;
FIG. 4 is a schematic view of the cross-sectional structure of the zero-degree reverse water hole of the present invention;
FIG. 5 is a graph of the relationship between the design parameters of the tool structure and thrust;
FIG. 6 is a graph of thrust generated by the tool versus field construction parameters.
Labeled as: 1. the upper part connects, 2, the little head end of the mill shoe, 3, the big head end of the mill shoe, 4, the drainage groove, 5, the wear-resisting carbide, 6, the main water hole, 7, the straight channel reverse water hole, 8, the zero angle reverse water hole.
Detailed Description
Example 1
The utility model provides a reverse water hole instrument of grinding shoes, this instrument includes upper portion joint 1 in proper order, grind shoes microcephaly end 2 and grind shoes head end 3, upper portion joint 1, grind shoes microcephaly end 2 and grind shoes head end 3 formula structures as an organic whole, set up to domatic changeover portion between grind shoes microcephaly end 2 and the grind shoes head end 3, be provided with the earial drainage groove 4 on the grind shoes head end 3, 3 tip of grind shoes head end are provided with wear-resisting carbide 5, the instrument inner chamber is provided with main water hole 6, 3 are provided with reverse water hole in the grind shoes head end, reverse water hole entry and the 6 root intercommunication of main water hole, the export is located domatic changeover portion.
The reverse water hole comprises a straight section and an inclined section, the straight section is parallel to the central axis of the tool, an outlet in the straight section is located on the slope transition section, the straight section is communicated with the inclined section, an inlet in the inclined section is communicated with the root of the main water hole, and the straight section and the inclined section are combined to form a zero-angle reverse water hole 8.
The reverse water hole is in a straight hole shape to form a straight channel reverse water hole 7, and the included angle between the straight channel reverse water hole 7 and the central axis of the tool is less than 45 degrees.
The upper part joint 1 adopts a thread buckle matched with the screw motor, the small end 2 of the grinding shoe adopts the outer diameter size with the same size as the screw motor, and the inner diameter of the main water hole 6 is the same as the inner diameter of the outlet end of the screw motor.
The drainage grooves 4 are a plurality of and are uniformly distributed at the large head end 3 of the grinding shoe, and the deepest part of the drainage grooves 4 is tangent to the small head end 2 of the grinding shoe.
The reverse water holes are multiple and are uniformly distributed in the circumferential direction of the tool.
The following description is provided for the present embodiment:
a reverse water hole shoe grinding tool comprises two tool structures, wherein each tool structure comprises an upper connector 1, a small end 2 of a shoe grinding, a large end 3 of the shoe grinding, a drainage groove 4, a main water hole 6 and wear-resistant hard alloy 5, and a first structure adopts a straight channel reverse water hole with a certain angle, as shown in figure 3; and the second structure adopts a zero-degree reverse water hole with an outlet along the negative direction of the well hole, as shown in figure 4.
Further, the upper connector 1 of the reverse water hole milling shoe tool is provided with a thread buckle matched with the screw motor, the small end 2 of the milling shoe is provided with an outer diameter with the same size as the screw motor, and the inner diameter of the main water hole 6 is the same as the inner diameter of the outlet end of the screw motor, so that the flow area of the water head loss of the fluid outside the reverse water hole is ensured to be as small as possible.
Further, the big head end 3 of the mill shoe of reverse water hole mill shoe instrument compares conventional mill shoe longer to guarantee that reverse water hole's arrangement can present littleer angle with the instrument axis, the big head end of mill shoe is provided with the changeover portion with the little head end junction of mill shoe.
Further, the deepest part of the drainage groove 4 of the reverse water hole shoe grinding tool is tangent to the small end 2 of the shoe grinding tool, so that the depth of the drainage groove 4 is ensured to be the largest, and the drainage groove 4 can be used for passing through drill cuttings or other foreign matters with larger volume.
Furthermore, the wear-resistant hard alloy 5 of the reverse water hole shoe grinding tool has no water hole, and can ensure a larger grinding and milling contact area in the process of drilling and grinding the bridge plug, so that the drilling and grinding efficiency is slightly improved.
Furthermore, the reverse water hole of the reverse water hole shoe grinding tool is a straight-channel reverse water hole 7, an outlet of the reverse water hole is arranged in the middle of the transition section, an inlet of the reverse water hole is connected with the root of the main water hole, the inner diameter of the reverse water hole, the angle formed by the inner diameter of the reverse water hole and the central axis of the tool and the number of the water holes can be adjusted, and the reverse water holes are uniformly distributed in the circumferential direction of the tool.
Furthermore, the zero-degree angle reverse water hole 8 of the reverse water hole shoe grinding tool is mainly characterized in that a tail end flow channel of the reverse water hole is at a zero-degree angle with a central axis of the tool, so that the more efficient utilization of the hydrodynamic pressure can be realized, and the maximization of the thrust can be realized through the structural change of a more complex reverse water hole because the zero-degree reverse water hole is not limited by the length of the big head end of the shoe grinding tool.
Example 2
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The embodiment of the utility model is as follows:
a reverse water hole shoe grinding tool and a design method thereof comprise two tool structures shown in figures 1 and 2, wherein each tool structure comprises an upper connector 1, a small end 2 of a shoe grinding, a large end 3 of the shoe grinding, a drainage groove 4, a main water hole 6 and wear-resistant hard alloy 5, a first structure adopts a straight channel reverse water hole 7 with a certain angle, and a second structure adopts a zero-angle reverse water hole 8 with an outlet along the negative direction of a well hole.
1. Connecting and installing tools:
the connection of the reverse water hole grinding shoe is similar to that of the traditional grinding shoe, the upper part joint is connected with tool strings such as a screw motor and the like, and then is connected with an oil pipe, but the reverse water hole grinding shoe suggests that a screw motor with large displacement and a continuous oil pipe with higher strength are adopted as much as possible to improve the thrust; in addition, the tool can also be used for replacing 5 wear-resistant hard alloy at the lower part and changing the wear-resistant hard alloy into a lower part joint, so that the tool can be used as a simple auxiliary running and annular flushing joint, can be connected in series in any operation string running in the coiled tubing and is used for assisting the running of a string.
2. The structure and the function of the reverse water hole of the tool are as follows:
as shown in FIG. 3, the diameter and angle of the reverse water holes in the first reverse water hole grinding shoe structure can be adjusted according to the needs, the number of the reverse water holes can be adjusted, but the number of the reverse water holes is not too large, and 3-6 holes are suitable; the reverse water hole can provide thrust for the pipe string to go in and can also provide power for the return of the annular drill cuttings, and the fluid outlet in the reverse water hole is high in speed, so that concentrated impact force can be provided, and the return of large-size drill cuttings is facilitated.
As shown in fig. 4, the inner diameter and the number of the water holes in the second reverse water hole milling shoe structure can be adjusted as required, and the parameters affecting the second reverse water hole structure are more, although the adjustment can be performed, the parallel of the last reverse water hole and the central axis of the tool must be ensured, that is, the fluid is ejected at a zero angle; the zero-angle reverse water hole can provide the maximum pipe string descending thrust and can also achieve the optimal annular flushing effect, but the water hole of the structure can be difficult to process.
3. The design principle and method of the tool reverse water hole are as follows:
FIG. 5 shows the reverse hydrophthalmia milling shoe tool configuration-with other parameters (geometric and site construction) fixed, the thrust provided by the tool is related to the hole diameter and hole angle, which can be obtained by numerical simulation or laboratory experiments. It can be seen that the thrust will gradually increase with decreasing eyelet diameter, and the thrust will also gradually increase with decreasing eyelet angle, i.e. the thrust can be changed by decreasing eyelet inner diameter and decreasing eyelet angle, but the eyelet angle is limited by the length of the big end of the 3-mill shoe, and the angle cannot be too small. If the design in the second structure of the water hole shoe grinding tool is adopted, the water hole with the angle of zero degree can be realized, and the adjustment of the thrust can be realized by changing the inner diameter of the hole. Under the condition that the total flow area of all the reverse water holes is kept unchanged, different hole numbers are adopted, and the thrust change is not too large.
In conclusion, the thrust of the tool mainly comes from the internal and external static pressure difference of the tool generated by the throttling effect of the fluid, and although the dynamic pressure of the fluid at the outlet of the reverse port can also generate a certain thrust, the thrust generated by the fluid at low speed is not too large due to the limitation of the working displacement of the coiled tubing. After the relation between the thrust and the diameter and the angle of the eyelet is clarified, a corresponding formula can be fitted to describe the change rule of the thrust, so that the reverse water hole structure is designed in a targeted manner according to the requirement of the thrust.
4. Adjusting construction parameters when the tool is applied:
the displacement and viscosity of the pumped fluid are not constant during the construction on site, and fig. 6 shows the relationship between the thrust generated by the tool and the viscosity and the construction displacement of the fluid, wherein the thrust increases with the increase of the viscosity of the fluid and increases with the increase of the construction displacement, and the relationship can also be described by a fitting formula. In summary, in the case of a tool configuration that has been determined, it is also possible to vary the magnitude of the thrust by varying the displacement of the work and the viscosity of the fluid, as long as the field work equipment meets the requirements.
Example 3
The well A is a shale gas horizontal well, the well depth is 5242m, the bottom vertical depth is 3484m, the maximum well deflection is 87.7 degrees, the well is completed by adopting a 139.7mm oil layer casing, the bridge plug is adopted for staged fracturing, the well is divided into 30 sections, the pressure of the well head of the well is 35MPa, and the well dredging tool string: outer rivet connects in the positive and negative 73mm 0.2m + motor head assembly in 73mm 0.9m + jarring in 73mm 1.7m + screw motor 73mm 3.96m + reverse water hole milling tool, the coiled tubing external diameter of adoption is 50.8mm, and the internal diameter is 40.5 mm.
This well adopts the reverse eye junk mill instrument that figure 3 designed, the total length of instrument is 340mm, main aperture internal diameter 31mm, main aperture degree of depth 290mm, major diameter end length 140mm, major diameter end external diameter 92mm, shoulder angle 150, the earial drainage groove cutting radius is 9.5mm, all eyes and earial drainage groove all along circumference evenly distributed, the eye figure is 5 (corresponding earial drainage groove figure is also the same), the eye is 17 with instrument axis contained angle, the eye diameter is established to 5.61 mm.
When the tool is used for drifting operation, the pressure bearing capacity of a continuous oil pipe is considered, the maximum pump pressure and the circulating pressure are set to be 55MPa, the working displacement range of a screw drill is considered, the flow is set to be 450L/min, the pressure loss in the whole circulating process is about 55MPa-35MPa =20MPa, wherein about 5MPa is the throttling differential pressure loss in a reverse water hole shoe grinding tool, so that the thrust of about 4484.43N along the bottom direction of a well is generated, the thrust directly acts on the bottom end of a pipe string and the bottom surface of a shoe grinding tool, the continuous oil pipe can be helped to descend, the friction coefficient between the pipe string and a shaft under the condition of no lubrication is calculated to be 0.15, the generated thrust can drag more continuous oil pipe columns with the length of about 430m, and the fluid viscosity at the moment is 0.001 kg/(m.s).
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Those of ordinary skill in the art will understand that: the components in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be correspondingly changed in one or more devices different from the embodiments. The components of the above embodiments may be combined into one component, or may be further divided into a plurality of sub-components.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
Claims (6)
1. A reverse water eye tool for grinding shoes, which is characterized in that: the tool comprises an upper connector (1), a small grinding shoe end (2) and a large grinding shoe end (3) in sequence, the upper connector (1), the small grinding shoe end (2) and the large grinding shoe end (3) are of an integrated structure, a slope transition section is arranged between the small grinding shoe end (2) and the large grinding shoe end (3), a drainage groove (4) is formed in the large grinding shoe end (3), a wear-resistant hard alloy (5) is arranged at the end of the large grinding shoe end (3), a main water hole (6) is formed in an inner cavity of the tool, a reverse water hole is formed in the large grinding shoe end (3), the inlet of the reverse water hole is communicated with the root of the main water hole (6), and the outlet is located on the slope transition section.
2. The reverse grove grind tool of claim 1, wherein: the reverse water hole comprises a straight section and an inclined section, the straight section is parallel to the central axis of the tool, an outlet in the straight section is positioned on the slope transition section, the straight section is communicated with the inclined section, an inlet in the inclined section is communicated with the root of the main water hole (6), and the straight section and the inclined section are combined to form a zero-degree reverse water hole (8).
3. The reverse grove grind tool of claim 2, wherein: the reverse water hole is in a straight hole shape to form a straight channel reverse water hole (7), and the included angle between the straight channel reverse water hole (7) and the central axis of the tool is less than 45 degrees.
4. The reverse grove grind tool of claim 3, wherein: the upper part connector (1) adopts a thread buckle matched with the screw motor, the small end (2) of the milling shoe adopts the outer diameter size with the same size as the screw motor, and the inner diameter of the main water hole (6) is the same as the inner diameter of the outlet end of the screw motor.
5. The reverse grove grind tool of claim 4, wherein: the drainage grooves (4) are a plurality of and are uniformly distributed at the large head end (3) of the grinding shoe, and the deepest part of the drainage grooves (4) is tangent to the small head end (2) of the grinding shoe.
6. The reverse grove grind tool of claim 5, wherein: the reverse water holes are multiple and are uniformly distributed in the circumferential direction of the tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021855416.9U CN212927766U (en) | 2020-08-31 | 2020-08-31 | Reverse water hole shoe grinding tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021855416.9U CN212927766U (en) | 2020-08-31 | 2020-08-31 | Reverse water hole shoe grinding tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212927766U true CN212927766U (en) | 2021-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021855416.9U Active CN212927766U (en) | 2020-08-31 | 2020-08-31 | Reverse water hole shoe grinding tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212927766U (en) |
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2020
- 2020-08-31 CN CN202021855416.9U patent/CN212927766U/en active Active
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