CN214333897U - Automatic grouting system, grouting monitoring system and grouting monitoring integrated device - Google Patents
Automatic grouting system, grouting monitoring system and grouting monitoring integrated device Download PDFInfo
- Publication number
- CN214333897U CN214333897U CN202120853702.XU CN202120853702U CN214333897U CN 214333897 U CN214333897 U CN 214333897U CN 202120853702 U CN202120853702 U CN 202120853702U CN 214333897 U CN214333897 U CN 214333897U
- Authority
- CN
- China
- Prior art keywords
- shaft
- slurry
- side wall
- monitoring
- grouting
- 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.)
- Active
Links
Images
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The utility model relates to the technical field of oil exploration and exploitation devices, and discloses an automatic grouting system, a grouting monitoring system and a grouting monitoring integrated device, wherein the automatic grouting system comprises a drill column arranged in a well, a shaft is concentrically sleeved on the periphery of the drill column, the outer side wall of the shaft is tightly attached to the inner side wall of a well drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft and the outer side wall of the drill column; one end of the shaft opening is higher than the plane of the drilling hole, a feeding pipe capable of conveying slurry to the annular cavity as required is arranged on the side wall of the shaft exceeding the drilling hole, and one end, far away from the shaft, of the feeding pipe is communicated with the slurry supply assembly through a conveying pipe. When the liquid level is in the low level in the pit, can automatic grout to predetermineeing the liquid level, still disclose grout detecting system, can realize the liquid level monitoring to the whole process of tripping, drilling, circulation, stewing, still disclose grout monitoring integrated device can realize automatic grout and also can guarantee whole monitoring to have very big spreading value and wide application prospect.
Description
Technical Field
The utility model relates to an oil exploration exploitation technical field, concretely relates to automatic grout system, grout monitoring system and grout monitoring integrated device.
Background
In the technical field of oil exploration and exploitation devices, when a well is drilled and repaired, blowout is usually prevented by using a manual grouting mode, but due to negligence of operators, the grouting is not timely performed in a shaft or grouting parameters are improper, and blowout accidents can still occur. At present, a conventional automatic grouting control system can only be used for tripping, cannot safely monitor the working conditions of tripping, circulation and standing, and in addition, a conventional underground liquid level detector can only detect the position of a liquid level without a quantitative liquid filling function, can only be manually filled, and cannot accurately fill the liquid level.
Therefore, the technical field of oil exploration and exploitation devices urgently needs a liquid level monitoring and automatic grouting integrated device which can realize the whole processes of tripping, drilling, circulating and standing and can automatically grout to a preset liquid level when the underground liquid level is at a low level.
Disclosure of Invention
The utility model overcomes prior art's defect provides an automatic grout system, grout monitoring system and grout monitoring integrated device, can realize the liquid level monitoring to the whole process of having bored, circulation, stewing to can be automatic grout to predetermineeing the liquid level when the liquid level is in the low level in the pit.
The utility model discloses a following technical scheme realizes:
an automatic grouting system comprises a drill string arranged in a drilling well, wherein a shaft is concentrically sleeved on the periphery of the drill string, the outer side wall of the shaft is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft and the outer side wall of the drill string; one end of the opening of the shaft is higher than the plane of the drilling hole, a feed pipe capable of conveying slurry to the annular cavity as required is arranged on the side wall of the shaft, which exceeds the well mouth, and one end of the feed pipe, which is far away from the shaft, is communicated with the slurry supply assembly through a delivery pipe.
Furthermore, an overflow pipe capable of guiding out the redundant slurry in the annular cavity is arranged on the side wall of the shaft, which exceeds the well mouth, the distance between the overflow pipe and the plane of the well mouth is larger than the distance between the feeding pipe and the plane of the well mouth, and an overflow tank for accommodating the slurry overflowing out of the annular cavity is arranged at one end of the overflow pipe, which is far away from the shaft.
Furthermore, thick liquids supply assembly is including setting up the mud storage tank in pit shaft side, the bottom or the lateral wall lower part of mud storage tank are equipped with out the thick liquid mouth, it communicates with the conveyer pipe to go out the thick liquid mouth.
Further, be equipped with the filling pump on the conveyer pipe, the input and the grout outlet intercommunication of filling pump, the output and the inlet pipe intercommunication of filling pump.
Furthermore, the top end of the drill column is provided with a lifting ring, and the lifting ring is matched with a functional end of the hydraulic hoisting machine.
A grouting monitoring system is used for monitoring the automatic grouting system and comprises a detection assembly for detecting and monitoring the slurry transfer process; the detection assembly comprises a flow sensor which is arranged on the conveying pipe and used for monitoring the volume of the slurry entering the annular cavity; and/or, when the automatic grouting system comprises a hydraulic lifting machine, the detection component comprises a hydraulic sensor arranged in the hydraulic lifting machine.
Further, when the automatic grouting system includes an overflow tank, the detection assembly includes a level sensor disposed above the overflow tank for monitoring a volume of slurry in the overflow tank.
Further, when the automatic grouting system comprises an overflow pipe, the detection assembly comprises an overflow sensor arranged on the overflow pipe and used for monitoring the overflow condition.
Furthermore, the device also comprises an acoustic alarm and/or an optical alarm, wherein the acoustic alarm and/or the optical alarm give an alarm when the detection assembly feeds back abnormity.
A grouting monitoring integrated device comprises an automatic grouting system and a grouting monitoring system; the automatic grouting system comprises a drill string arranged in a drilling well, a shaft is concentrically sleeved on the periphery of the drill string, the outer side wall of the shaft is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft and the outer side wall of the drill string; one end of the opening of the shaft is higher than the plane of the drilling hole, a feeding pipe capable of feeding slurry into the annular cavity as required is arranged on the side wall of the shaft, which exceeds the well mouth, one end of the feeding pipe, which is far away from the shaft, is communicated with the slurry supply assembly through a conveying pipe, and a flow sensor for monitoring the volume of the slurry entering the annular cavity is arranged on the conveying pipe; and/or, when the automatic grouting system comprises a hydraulic lifting machine, the grouting monitoring system further comprises a hydraulic sensor arranged in the hydraulic lifting machine.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model relates to the technical field of oil exploration and exploitation devices, and discloses an automatic grouting system, which comprises a drill stem arranged in a drilling well, wherein a shaft is concentrically sleeved on the periphery of the drill stem, the outer side wall of the shaft is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft and the outer side wall of the drill stem; one end of the shaft opening is higher than the plane of the drilling hole, a feeding pipe capable of conveying slurry to the annular cavity as required is arranged on the side wall of the shaft exceeding the drilling hole, and one end, far away from the shaft, of the feeding pipe is communicated with the slurry supply assembly through a conveying pipe. When the liquid level is in the low level in the pit, can automatic grout to predetermineeing the liquid level, still disclose grout detecting system, can realize the liquid level monitoring to the whole process of tripping, drilling, circulation, stewing, still disclose grout monitoring integrated device can realize automatic grout and also can guarantee whole monitoring to have very big spreading value and wide application prospect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a front view of the overall structure of the present invention;
fig. 2 is a schematic diagram of the electric control module of the present invention.
Reference numbers and corresponding part names in the drawings:
1-overflow tank, 2-liquid level sensor, 3-overflow sensor, 4-drill column, 5-shaft, 6-hydraulic sensor, 7-flow sensor, 8-filling pump, 9-slurry storage tank and 10-hydraulic hoisting machine.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
An automatic grouting system comprises a drill string 4 arranged in a drilling well, wherein a shaft 5 is concentrically sleeved on the periphery of the drill string 4, the outer side wall of the shaft 5 is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft 5 and the outer side wall of the drill string 4; the opening end of the shaft 5 is higher than the plane of the drilling hole, a feed pipe capable of delivering slurry to the annular cavity as required is arranged on the side wall of the shaft 5, which exceeds the drilling hole, and one end of the feed pipe, which is far away from the shaft 5, is communicated with the slurry supply assembly through a delivery pipe. As shown in the attached figure 1 in the specification, it can be understood that the slurry level in the annular cavity of the shaft 5 reflects the underground liquid level, the conveying pipe is communicated with the slurry supply assembly and then communicated with the annular cavity through the feeding pipe, the slurry is automatically supplemented when the slurry level in the annular cavity is too low, and the slurry is stopped when the slurry level in the annular cavity is higher.
Furthermore, an overflow pipe capable of guiding out the excessive slurry in the annular cavity is arranged on the side wall of the shaft 5, which exceeds the well mouth, the distance between the overflow pipe and the plane of the well mouth is larger than the distance between the feeding pipe and the plane of the well mouth, and an overflow tank 1 for accommodating the slurry overflowing out of the annular cavity is arranged at one end of the overflow pipe, which is far away from the shaft 5. It will be appreciated that in order to ensure that the slurry in the wellbore bore is stable, it is usual to continue grouting and continue flowing out, to achieve a dynamic equilibrium, and therefore an overflow pipe is provided in the side wall of the wellbore 5 and an overflow tank 1 is provided below the discharge end of the overflow pipe to accommodate the slurry flowing out of the annulus.
Further, thick liquids supply assembly is including setting up the stock tank 9 in pit shaft 5 side, the bottom or the lateral wall lower part of stock tank 9 are equipped with out the thick liquid mouth, it communicates with the conveyer pipe to go out the thick liquid mouth. Furthermore, be equipped with filling pump 8 on the conveyer pipe, filling pump 8's input and grout outlet intercommunication, filling pump 8's output and inlet pipe intercommunication. It can be understood that the slurry supply assembly comprises a slurry storage tank 9 for storing slurry, the slurry storage tank 9 conveys the slurry to the annular cavity through a conveying pipe, and a filling pump 8 is arranged on the conveying pipe to realize the control of the on-off and the flow of the conveying pipe.
Further, a lifting ring is arranged at the top end of the drill string 4, and the lifting ring is matched with a functional end of the hydraulic hoisting machine 10. It can be understood that the whole grouting process comprises the procedures of drilling and tripping, so that the drill string 4 needs to be lifted and lowered, a lifting ring is arranged at the top end of the drill string 4, and the lifting ring is matched with the functional end of the hydraulic hoisting machine 10, so that the drilling and tripping operations can be stably and safely carried out.
A grouting monitoring system is used for monitoring the automatic grouting system and comprises a detection assembly for detecting and monitoring the slurry transfer process; the detection assembly comprises a flow sensor 7 which is arranged on the conveying pipe and used for monitoring the volume of the slurry entering the annular cavity; and/or, when the automatic grouting system comprises a hydraulic lifting machine 10, the detection assembly comprises a hydraulic sensor 6 arranged in the hydraulic lifting machine 10. As shown in the attached drawing 2, it can be understood that the grouting monitoring system is composed of a detection assembly, a PLC control system, a touch display screen, an electric cabinet and the like, the PLC control system is installed in the electric cabinet, the detection assembly continuously monitors real-time signals, data are transmitted to the PLC, the PLC sends an action instruction to the filling pump 8 after comparison and analysis, the filling pump 8 is opened or closed or adjusts the flow rate of slurry in the delivery pipe according to the instruction, the touch display screen is provided with a main interface, the main interface is provided with selection keys of three working conditions of drilling, drilling and liquid filling, and the control operation of the automatic liquid filling system, such as parameter input, threshold setting, system opening and closing and the like, can be implemented on the touch display screen.
Further, when the automatic grouting system includes the overflow tank 1, the detection assembly includes a level sensor 2 disposed above the overflow tank 1 for monitoring the volume of the slurry in the overflow tank 1. It can be understood that the detection assembly can be composed of three instruments, namely a liquid level sensor 2, a hydraulic pressure sensor 6 and a flow sensor 7, wherein the liquid level sensor 2 is arranged on the overflow tank 1 and is used for detecting the liquid level change in the tank; the hydraulic sensor 6 is arranged in an oil circuit of the hydraulic hoisting machine 10 and used for detecting a pressure signal of a large hook hanging weight when the drill string 4 is tripped in and out; the flow sensor 7 is connected to a pipeline at the outlet of the perfusion pump 8 and is used for detecting the flow of the perfusion pump 8. The three sensors simplify the system, are convenient to maintain and are more reliable to use.
Further, when the automatic grouting system comprises an overflow pipe, the detection assembly comprises an overflow sensor 3 disposed on the overflow pipe for monitoring the overflow condition. It can be understood that the detection assembly can also be composed of four instruments, namely a liquid level sensor 2, a hydraulic pressure sensor 6, a flow sensor 7 and an overflow sensor 3, wherein the liquid level sensor 2 is arranged on the overflow tank 1 and is used for detecting the liquid level change in the tank; the hydraulic sensor 6 is arranged in an oil circuit of the hydraulic hoisting machine 10 and used for detecting a pressure signal of a large hook hanging weight when the drill string 4 is tripped in and out; the flow sensor 7 is connected to a pipeline at the outlet of the perfusion pump 8 and is used for detecting the flow of the perfusion pump 8; the overflow sensor 3 is mounted on an overflow pipe connected to the shaft 5, wherein it is used to detect whether overflow occurs in the shaft 5. A plurality of sensors collect signals more abundantly, and the regulation and control of the working condition are more timely and accurate.
Furthermore, the device also comprises an acoustic alarm and/or an optical alarm, wherein the acoustic alarm and/or the optical alarm give an alarm when the detection assembly feeds back abnormity. It will be appreciated that, during normal drilling, the liquid in the well bore 5 will overflow the overflow tank 1 by an amount equal to the displacement of the drill string 4, which is detected by the amount of change in the liquid level in the overflow tank 1, which is detected by the level sensor 2 attached to the overflow tank 1. When the overflow amount is detected to be larger than the displacement amount, the overflow is generated, and then an overflow sound-light alarm is sent out. When the overflow amount is detected to be less than the displacement amount, the well leakage is determined to occur, and at the moment, a sound and light alarm of the well leakage is sent out. Therefore, the sound alarm or the light alarm can be arranged to remind the worker to respond in time.
A grouting monitoring integrated device comprises an automatic grouting system and a grouting monitoring system; the automatic grouting system comprises a drill string 4 arranged in a drilling well, a shaft 5 is concentrically sleeved on the periphery of the drill string 4, the outer side wall of the shaft 5 is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft 5 and the outer side wall of the drill string 4; one end of the opening of the shaft 5 is higher than the plane of the drilling hole, a feed pipe capable of conveying slurry to the annular cavity as required is arranged on the side wall of the shaft 5, which exceeds the well mouth, one end of the feed pipe, which is far away from the shaft 5, is communicated with the slurry supply assembly through a delivery pipe, and a flow sensor 7 for monitoring the volume of the slurry entering the annular cavity is arranged on the delivery pipe; and/or, when the automatic grouting system comprises a hydraulic lifting machine 10, the grouting monitoring system further comprises a hydraulic sensor 6 arranged in the hydraulic lifting machine 10. It can be understood that, the integrated device shows the state that the automatic tank slurry system and the grouting monitoring system are organically combined and actually used, at the moment, not only can automatic grouting be realized, but also whole-course monitoring can be ensured, and the integrated device has great popularization value and wide application prospect, and can select different types of sensors and matched mechanical hardware facilities according to working condition requirements in the actual production process.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention, and are not intended to indicate or imply that the claimed components or mechanisms must be in a particular orientation, constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only an embodiment of the present invention, and should not be used to limit the protection scope of the present invention, any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The automatic grouting system is characterized by comprising a drill string (4) arranged in a drilled well, wherein a shaft (5) is concentrically sleeved on the periphery of the drill string (4), the outer side wall of the shaft (5) is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft (5) and the outer side wall of the drill string (4);
the opening end of the shaft (5) is higher than the plane of the drilling hole, a feeding pipe capable of conveying slurry to the annular cavity as required is arranged on the side wall of the shaft (5) exceeding the drilling hole, and one end, far away from the shaft (5), of the feeding pipe is communicated with the slurry replenishing assembly through a conveying pipe.
2. An automatic grouting system according to claim 1, characterised in that the side wall of the shaft (5) beyond the wellhead is provided with an overflow pipe for leading out excess slurry in the annulus, the distance between the overflow pipe and the plane of the drilling opening is larger than the distance between the feeding pipe and the plane of the drilling opening, and the end of the overflow pipe far away from the shaft (5) is provided with an overflow tank (1) for accommodating slurry overflowing the annulus.
3. The automatic grouting system of claim 1, wherein the slurry replenishing assembly comprises a slurry storage tank (9) arranged at the side of the shaft (5), and a slurry outlet is formed in the bottom or the lower part of the side wall of the slurry storage tank (9) and communicated with the conveying pipe.
4. An automatic grouting system according to claim 3, characterised in that the delivery pipe is provided with a filling pump (8), the input end of the filling pump (8) is communicated with the grout outlet, and the output end of the filling pump (8) is communicated with the feeding pipe.
5. An automatic grouting system according to claim 1, characterised in that the top end of the drill string (4) is provided with a lifting eye, which is adapted to the functional end of a hydraulic lifting machine (10).
6. A grouting monitoring system, which is used for monitoring the automatic grouting system of any one of claims 1-5, and comprises a detection component for detecting and monitoring the slurry transfer process;
the detection assembly comprises a flow sensor (7) which is arranged on the conveying pipe and used for monitoring the volume of the slurry entering the annular cavity;
and/or, when the automatic grouting system comprises a hydraulic lifting machine (10), the detection assembly comprises a hydraulic sensor (6) arranged in the hydraulic lifting machine (10).
7. A grouting monitoring system according to claim 6, characterised in that when the automatic grouting system comprises an overflow tank (1), the detection assembly comprises a level sensor (2) arranged above the overflow tank (1) for monitoring the volume of slurry in the overflow tank (1).
8. A grouting monitoring system according to claim 6 or 7, characterised in that when the automatic grouting system comprises an overflow pipe, the detection member comprises an overflow sensor (3) arranged on the overflow pipe for monitoring the overflow.
9. A grout monitoring system according to claim 6, further comprising an acoustic and/or optical alarm which gives an alarm when an anomaly in the feedback from the assembly is detected.
10. The grouting monitoring integrated device is characterized by comprising an automatic grouting system and a grouting monitoring system;
the automatic grouting system comprises a drill string (4) arranged in a drilling well, a shaft (5) is concentrically sleeved on the periphery of the drill string (4), the outer side wall of the shaft (5) is tightly attached to the inner side wall of a drilling foundation, and an annular cavity capable of temporarily storing slurry is arranged between the inner side wall of the shaft (5) and the outer side wall of the drill string (4);
one end of the opening of the shaft (5) is higher than the plane of the drilling hole, a feed pipe capable of feeding slurry into the annular cavity as required is arranged on the side wall of the shaft (5) exceeding the well mouth, one end of the feed pipe, far away from the shaft (5), is communicated with the slurry supply assembly through a delivery pipe, and a flow sensor (7) for monitoring the volume of the slurry entering the annular cavity is arranged on the delivery pipe
And/or, when the automatic grouting system comprises a hydraulic lifting machine (10), the grouting monitoring system further comprises a hydraulic sensor (6) arranged in the hydraulic lifting machine (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120853702.XU CN214333897U (en) | 2021-04-23 | 2021-04-23 | Automatic grouting system, grouting monitoring system and grouting monitoring integrated device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120853702.XU CN214333897U (en) | 2021-04-23 | 2021-04-23 | Automatic grouting system, grouting monitoring system and grouting monitoring integrated device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214333897U true CN214333897U (en) | 2021-10-01 |
Family
ID=77893322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120853702.XU Active CN214333897U (en) | 2021-04-23 | 2021-04-23 | Automatic grouting system, grouting monitoring system and grouting monitoring integrated device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214333897U (en) |
-
2021
- 2021-04-23 CN CN202120853702.XU patent/CN214333897U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11008830B2 (en) | Stratified waterflooding apparatus | |
| NO330919B1 (en) | Well control method using continuous pressure painting during drilling | |
| CA2919654C (en) | Dual purpose mud-gas separator and methods | |
| WO2001049972A1 (en) | Well kick detector | |
| CN206468347U (en) | Multi-functional stratigraphic rig | |
| CN114517675A (en) | Evaluation equipment and evaluation method for leakage and overflow monitoring instrument of three-high gas well | |
| CN105715220B (en) | A kind of drilling well control pressure system | |
| CN101196110A (en) | Method for monitoring lifting and lowering drill process at artesian well locale and automatic grouting control | |
| CN214333897U (en) | Automatic grouting system, grouting monitoring system and grouting monitoring integrated device | |
| KR101257004B1 (en) | Underground fluid sample extraction system at a certain depth | |
| CN212300521U (en) | Liquid level fluctuation preventing device for logging | |
| CN211777298U (en) | Vault concrete coring and punching machine | |
| CN211144418U (en) | Core acquisition device based on rope fisher | |
| CN206539325U (en) | drilling fluid automatic grouting machine | |
| CN211179421U (en) | Directional drilling fluid viscosity measuring device for trenchless technology | |
| CN210858612U (en) | Constant-pressure variable-displacement supply system for well killing fluid | |
| CN2349348Y (en) | Instrument for surveying leak off rate and thief zone | |
| CN212389331U (en) | Continuous tripping and overflow monitoring system | |
| CN204804725U (en) | A well head pressure control device for controlling press well drilling | |
| CN201218067Y (en) | Automatic drilling mud monitoring system | |
| CN212428661U (en) | Pressure controlled drilling apparatus for maintaining bottom hole pressure constant | |
| CN210343270U (en) | Drilling well head drilling fluid returns out liquid level monitoring alarm device | |
| CN216240613U (en) | Underground liquid level monitoring system and liquid filling system | |
| CN206489179U (en) | A kind of CBM Drainage water speed monitoring device | |
| CN113669023A (en) | Automatic control system for coiled tubing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |