CN115680537A - Drilling debris collecting device used in hydrofracturing method ground stress test - Google Patents
Drilling debris collecting device used in hydrofracturing method ground stress test Download PDFInfo
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- CN115680537A CN115680537A CN202310000052.8A CN202310000052A CN115680537A CN 115680537 A CN115680537 A CN 115680537A CN 202310000052 A CN202310000052 A CN 202310000052A CN 115680537 A CN115680537 A CN 115680537A
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Abstract
The application discloses a drilling piece collection device for among hydrofracturing method ground stress test, the drilling rod bottom is established ties in proper order and is had last collector, go up the packer, the fracturing section, lower packer, lower collector, it is equipped with a plurality of wash ports respectively on the outer wall for cavity tubular structure and lower collector respectively, it is connected with drilling rod and last packer respectively to go up the collector both ends, the top and the lower packer sealing connection of lower collector, the external diameter of upper and lower collector is equivalent with the upper and lower packer that corresponds, go up the collector and last packer intercommunication and be equipped with the filter screen. This application sets up the outer diameter respectively in upper and lower packer outside and the upper and lower collector of cavity tubulose to set up the wash port on upper and lower collector outer wall, can collect the piece that drops among the crustal stress test process, can reduce again and reciprocate the in-process piece to the wearing and tearing and the destruction of packer, have simple structure, drilling piece collection efficiency height, the characteristics that the packer loss is little.
Description
Technical Field
The application belongs to the technical field of geological exploration, and in particular relates to a drilling debris collecting device for a hydrofracturing method ground stress test, which is simple in structure, high in drilling debris collecting efficiency and small in packer loss.
Background
In the investigation and design process of large-scale underground engineering such as mine engineering, traffic tunnel engineering and the like, the influence of an earth stress field on the design and construction of the underground engineering is generally required to be considered in an important mode and is used as an important basis for engineering design, and the earth stress characteristic is grasped through drilling, which is particularly important.
At present, in a deep hole ground stress test, a hydrofracturing method is a common test method because the theory is mature, the operation is simple, the measurement depth is large, the cost is low, and the hydrofracturing method can adapt to test work of various apertures, and can preliminarily find out the change characteristics of ground stress along with the depth of underground engineering which is not disclosed temporarily, and further judge the stability of underground engineering rock burst and nearby geological structures. The hydrofracturing method includes selecting a section of exposed drilling hole of bedrock, sealing the hole with a packer, injecting liquid through a fracturing section, pressurizing until the sealed hole wall is broken, collecting and analyzing pressure change data, recording or observing breaking direction with a stamping device, and finally calculating the magnitude and direction of primary stratum principal stress according to the pressure change, direction and other data in the breaking process. However, the hydraulic fracturing method still requires challenges in facing poor geological conditions during testing. When the test drilling hole passes through a relatively broken section, the small chips falling from the hole wall not only directly affect the lifting operation of the hydrofracturing method test equipment, but also can increase the friction force between the equipment and the hole wall after the small chips fall between the test equipment and the hole wall, so that the test equipment cannot lift and damage the rubber sleeve of the packer, and the test equipment is scrapped under severe conditions.
In the prior art, in order to solve the adverse effect of drilling debris on test equipment, debris falling from the upper part is generally considered, and a corresponding protection device is arranged at the upper end of a packer, so that the damage of the debris on a rubber sleeve of the packer in the rising process of the test equipment can be reduced, and the problem that the debris cannot rise and be recovered can be avoided; however, the abrasion of fragments in the broken hole wall and underground water in the descending process of the test equipment and the impact effect of underground water in the hole on the collected fragments in the ascending and descending process of the test equipment are not considered, so that the abrasion and the damage of a rubber sleeve of the packer are difficult to avoid in the descending process, and the fragments in the hole cannot be stably collected, so that the accurate analysis of the subsequent ground stress change rule is influenced. For this reason, in the prior art, rigid conical devices are respectively arranged at the outer ends of the upper packer and the lower packer, and a protective sleeve is arranged outside the drill rod to collect upper debris, so that the rubber sleeve is protected in the processes of lifting and lowering to reduce the loss of the packers; however, the cone also only plays a role in protection, and cannot solve the problem that the underground water in the hole impacts collected debris in the lifting process of the test equipment, and the disturbance of the underground water in the hole can be increased, so that the collection of drilling debris in the hole is more difficult, and the subsequent analysis and judgment of the ground stress are seriously influenced.
Disclosure of Invention
According to the defects of the prior art, the drilling debris collecting device for the hydrofracturing method ground stress test is simple in structure, high in drilling debris collecting efficiency and small in packer loss.
The application is realized as follows: the drilling device comprises a drill rod, wherein the bottom end of the drill rod is sequentially detachably connected in series with an upper collector, an upper packer, a fracturing section, a lower packer and a lower collector, the upper collector and the lower collector are respectively of a hollow tubular structure, a plurality of drain holes are formed in the outer wall of one side of the fracturing section away from the outer wall at intervals, the top end of the upper collector is connected with the drill rod in a sealing mode, the lower end of the upper collector is communicated with the upper packer, a filter screen with the aperture smaller than the drain holes is arranged between the upper collector and the upper packer, the top end of the lower collector is connected with the lower packer in a sealing mode, the outer diameter of the lower portion of the upper collector is equivalent to the outer diameter of the upper packer, and the outer diameter of the upper portion of the lower collector is equivalent to the outer diameter of the lower packer.
The beneficial effect of this application:
1. this application sets up the outer diameter respectively in the outside of upper and lower packer and is equivalent and the upper and lower collector of cavity tubulose, and set up the wash port on the outer wall of collector, and will go up collector and last packer intercommunication and set up the filter screen between and, through the cooperation of wash port and filter screen, can collect the drilling piece of test equipment in the promotion, the decline in-process by the efficient, can weaken the clastic impact effect of downthehole groundwater to having collected again in the lift process, thereby can realize the clastic stability in the drilling, high-efficient collection, be favorable to improving the accurate analysis of follow-up ground stress variation law.
2. The collector with the same outer diameter is arranged on the outer sides of the upper packer and the lower packer, and the wall of the drilling hole can be shaped in advance in the lifting process, so that the abrasion and the damage of broken hole walls and fragments in underground water to the rubber sleeve can be reduced, the sealing performance of the rubber sleeve is ensured, the accuracy of ground stress test is ensured, and the problem that test equipment cannot rise and be recovered can be avoided; and between the wash port of collector and with the filter screen cooperation, not only can reduce the piece in the groundwater in the drilling, can also prevent that the piece after the collection from spilling over once more to can further reduce the piece and to the frictional destruction effect of packer, reach the purpose that effectively reduces packer loss and improve ground stress test efficiency.
3. According to the device, the drain holes in the outer walls of the upper collector and the lower collector are further arranged to be inclined holes inclined towards the collecting side, so that the collector can better capture chips in underground water in a drilled hole in the lifting process; the drain holes on the outer walls of the upper collector and the lower collector are respectively arranged into structures gradually increasing towards the outer side collecting hole diameter, so that the layered collection of the fragments can be realized, and the phenomenon that the collection of the fragments is influenced due to the blockage of the drain holes can be effectively avoided.
4. This application further keeps away from the frustum groove of packer down in the collector, and sets up a plurality of wash ports or bottom opening on the inner wall in frustum groove to can utilize the frustum groove to filter the large granule piece in the groundwater, can avoid the wearing and tearing of large granule piece to the packer, can be convenient for again collect the piece of test usefulness, be favorable to improving clastic collection efficiency.
To sum up, this application has simple structure, drilling piece collection efficiency height, the little characteristics of packer loss.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a second structural diagram of the present application;
FIG. 3 is an enlarged view of FIG. 1 in partial cutaway;
FIG. 4 is an enlarged view of FIG. 2 in partial cutaway;
in the figure: 1-drill rod, 2-upper collector, 3-upper packer, 4-fracturing section, 5-lower packer, 6-lower collector, 7-drain hole, 8-filter screen, 9-frustum part I, 10-frustum groove and 11-frustum part II.
Detailed Description
The present application is further described with reference to the following drawings and examples, but the present application is not limited in any way, and any modification or improvement based on the teaching of the present application falls within the scope of the present application.
As shown in fig. 1 to 4, the device comprises a drill rod 1, wherein the bottom end of the drill rod 1 is sequentially detachably connected in series with an upper collector 2, an upper packer 3, a fracturing section 4, a lower packer 5 and a lower collector 6, the upper collector 2 and the lower collector 6 are respectively of a hollow tubular structure, a plurality of drain holes 7 are formed in the outer wall of one side, away from the fracturing section 4, of the hollow tubular structure at intervals, the top end of the upper collector 2 is in sealing connection with the drill rod 1, the lower end of the upper collector is communicated with the upper packer 3, a filter screen 8 with the aperture smaller than the drain holes 7 is arranged between the upper collector 2 and the upper packer 3, the top end of the lower collector 6 is in sealing connection with the lower packer 5, the outer diameter of the lower part of the upper collector 2 is equivalent to the outer diameter of the upper packer 3, and the outer diameter of the upper part of the lower collector 6 is equivalent to the outer diameter of the lower packer 5.
The lower part of the outer wall of the upper collector 2 occupies 1/3-1/2 of the total length and is sealed without a drain hole 7, and the upper part of the outer wall of the lower collector 6 occupies 1/3-1/2 of the total length and is sealed without a drain hole 7.
The axis of the drain hole 7 on the outer wall of the upper collector 2 is vertical to the outer wall or inclined towards one side of the drill rod 1, and the axis of the drain hole 7 on the outer wall of the lower collector 6 is vertical to the outer wall or inclined towards one side far away from the lower packer 5.
The diameter of the drain hole 7 on the outer wall of the upper collector 2 is gradually reduced towards one side of the upper packer 3 along the axial direction, and/or the diameter of the drain hole 7 on the outer wall of the lower collector 6 is gradually reduced towards one side of the lower collector 6 along the axial direction.
The water discharge hole 7 is a tapered hole with a large outer part and a small inner part.
The upper part of the upper collector 2 close to the drill rod 1 is provided with a hollow frustum part I9, the top end of the frustum part I9 is detachably and hermetically connected with the drill rod 1, and the outer wall of the frustum part I9 is provided with a plurality of water drainage holes 7 at intervals. The drain hole 7 in the inclined frustum portion i 9 has an opening facing the capturing direction, so that debris can be captured better to improve the capturing effect, and a guiding function can be provided when the hole wall is shaped.
One end, far away from the lower packer 5, of the lower collector 6 is closed and is provided with an inwards concave frustum groove 10, the opening direction of the frustum groove 10 deviates from the lower packer 5, the conical bottom of the frustum groove 10 is sealed, and a plurality of drain holes 7 are formed in the inner wall of the frustum groove 10 at intervals, or the conical bottom of the frustum groove 10 is provided with an opening.
The frustum groove 10 is coaxial with the lower collector 6; the drain hole 7 on the outer wall of the lower collector 6 is arranged at the middle part close to the lower packer 5, and the drain hole 7 on the inner wall of the frustum groove 10 is arranged at one side close to the cone bottom.
The aperture of the drain hole 7 on the inner wall of the frustum groove 10 or the aperture of the opening of the cone bottom is not smaller than the aperture of the drain hole 7 on the outer wall of the lower collector 6.
The lower part of the lower collector 6, which is far away from the lower packer 5, is provided with a hollow frustum part II 11, and a plurality of drain holes 7 are arranged on the outer wall of the upper part of the frustum part II 11, which is close to the lower packer 5, at intervals. The inclined frustum portion II 11 functions in the same way as the frustum portion I9, so that debris can be captured better to improve the capturing effect.
The upper collector 2 and the lower collector 6 are of rigid hollow tubular structures which are made of steel or hard plastics and the like and are wear-resistant.
The drill rod 1, the upper collector 2, the upper packer 3, the fracturing section 4, the lower packer 5 and the lower collector 6 are sequentially connected through threads.
The working principle and the working process of the application are as follows:
as shown in fig. 1 to 4, during the lifting process of the testing equipment, the debris on the upper drilling hole wall falls under the friction and disturbance action of the drill rod 1, the upper collector 2 enters the upper collector 2 along with the underground water through the collecting hole (i.e. the drain hole 7) and enters the upper packer 3 through the filter screen 8 at the bottom end to discharge excessive water during the friction action of the drill rod 1, the debris and the hole wall, so that the collected debris is retained in the upper collector 2 at the upper end of the filter screen 8, and the filter screen 8 with smaller hole diameter also ensures that the debris cannot overflow the upper collector 2 again; during the descending process of the test device, when the device meets the suspended debris in the groundwater, the debris can enter the lower collector 6 along the frustum groove 10 and the collecting hole (i.e. the drainage hole 7) at the bottom of the lower collector along with the water flow, and the excess water is drained through the rest drainage holes 7, so that the debris entering the lower collector 6 is deposited in the lower collector, and the debris is ensured not to overflow the lower collector 6 again. Meanwhile, in the lifting and descending processes of the test equipment, the rigid collector can also pre-shape the wall of the drilled hole, so that the abrasion and even damage of broken hole walls and debris in underground water to the packer can be reduced. In addition, the cone parts on the upper side and the lower side of the collector can form progressive shaping on the hole wall during lifting, so that the blockage of the broken hole wall on the lifting of the test equipment can be reduced or even eliminated.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. The drilling debris collecting device comprises a drill rod (1) and is characterized in that the bottom end of the drill rod (1) is sequentially detachably connected with an upper collector (2), an upper packer (3), a fracturing section (4), a lower packer (5) and a lower collector (6) in series, the upper collector (2) and the lower collector (6) are respectively of a hollow tubular structure, a plurality of drain holes (7) are formed in the outer wall of one side, away from the fracturing section (4), of the outer wall at the upper side, the top end of the upper collector (2) is in sealing connection with the drill rod (1), the lower end of the upper collector (2) is communicated with the upper packer (3), a filter screen (8) with the diameter smaller than that of the drain holes (7) is arranged between the upper collector (2) and the upper packer (3), the top end of the lower collector (6) is in sealing connection with the lower packer (5), the outer diameter of the lower part of the upper collector (2) is equivalent to that of the upper packer (3), and the outer diameter of the lower collector (6) is equivalent to that of the lower packer (5).
2. The drilling debris collecting device for the hydrofracturing ground stress test according to claim 1, wherein the lower part of the outer wall of the upper collector (2) occupies a section of 1/3-1/2 of the total length and is closed without a drain hole (7), and the upper part of the outer wall of the lower collector (6) occupies a section of 1/3-1/2 of the total length and is closed without a drain hole (7).
3. The drilling debris collecting device for the hydrofracturing ground stress test according to claim 2, wherein the axis of the drain hole (7) on the outer wall of the upper collector (2) is perpendicular to the outer wall or inclined towards one side of the drill rod (1), and the axis of the drain hole (7) on the outer wall of the lower collector (6) is perpendicular to the outer wall or inclined towards one side far away from the lower packer (5).
4. The apparatus for collecting drill debris used in a hydrofracturing ground stress test according to claim 2, wherein the diameter of the drain hole (7) on the outer wall of the upper collector (2) is gradually reduced toward the upper side of the packer (3) in the axial direction, and/or the diameter of the drain hole (7) on the outer wall of the lower collector (6) is gradually reduced toward the lower side of the collector (6) in the axial direction.
5. The drilling debris collecting device for the hydrofracturing ground stress test is characterized in that a hollow frustum part I (9) is arranged on the upper part, close to the drill rod (1), of the upper collector (2), the top end of the frustum part I (9) is detachably and hermetically connected with the drill rod (1), and a plurality of water drainage holes (7) are formed in the outer wall of the frustum part I (9) at intervals.
6. The drilling debris collecting device used in the hydrofracturing ground stress test according to any one of claims 1 to 5, characterized in that one end of the lower collector (6) far away from the lower packer (5) is closed and provided with an inwards concave frustum groove (10), the opening direction of the frustum groove (10) is far away from the lower packer (5), the bottom of the frustum groove (10) is sealed, and a plurality of drainage holes (7) are arranged on the inner wall at intervals, or the bottom of the frustum groove (10) is provided with an opening.
7. The drill hole debris collection device for use in a hydrofracturing ground stress test of claim 6, wherein the frustum groove (10) is coaxial with the lower collector (6); the drain hole (7) on the outer wall of the lower collector (6) is arranged in the middle, and the drain hole (7) on the inner wall of the frustum groove (10) is arranged on one side close to the bottom of the frustum.
8. The drilling debris collecting device for the hydrofracturing ground stress test according to claim 7, wherein the hole diameter of the drain hole (7) on the inner wall of the frustum groove (10) or the opening hole diameter of the cone bottom is not smaller than the hole diameter of the drain hole (7) on the outer wall of the lower collector (6).
9. The drilling debris collecting device for the hydrofracturing ground stress test according to claim 7, wherein the lower part of the lower collector (6) far away from the lower packer (5) is provided with a hollow frustum part II (11), and the outer wall of the upper part of the frustum part II (11) close to the lower packer (5) is provided with a plurality of drainage holes (7) at intervals.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310000052.8A CN115680537A (en) | 2023-01-01 | 2023-01-01 | Drilling debris collecting device used in hydrofracturing method ground stress test |
| CN202321194767.3U CN219864916U (en) | 2023-01-01 | 2023-05-17 | Drilling debris collecting device for hydraulic fracturing method ground stress test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310000052.8A CN115680537A (en) | 2023-01-01 | 2023-01-01 | Drilling debris collecting device used in hydrofracturing method ground stress test |
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| Publication Number | Publication Date |
|---|---|
| CN115680537A true CN115680537A (en) | 2023-02-03 |
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| CN202310000052.8A Pending CN115680537A (en) | 2023-01-01 | 2023-01-01 | Drilling debris collecting device used in hydrofracturing method ground stress test |
| CN202321194767.3U Active CN219864916U (en) | 2023-01-01 | 2023-05-17 | Drilling debris collecting device for hydraulic fracturing method ground stress test |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321194767.3U Active CN219864916U (en) | 2023-01-01 | 2023-05-17 | Drilling debris collecting device for hydraulic fracturing method ground stress test |
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2023
- 2023-01-01 CN CN202310000052.8A patent/CN115680537A/en active Pending
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| CN219864916U (en) | 2023-10-20 |
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