CN112627755A - Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool - Google Patents
Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool Download PDFInfo
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- CN112627755A CN112627755A CN202011558002.4A CN202011558002A CN112627755A CN 112627755 A CN112627755 A CN 112627755A CN 202011558002 A CN202011558002 A CN 202011558002A CN 112627755 A CN112627755 A CN 112627755A
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- 238000005553 drilling Methods 0.000 title claims abstract description 58
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 230000001960 triggered effect Effects 0.000 claims abstract description 5
- 239000000725 suspension Substances 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 229910001369 Brass Inorganic materials 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 2
- 241000227287 Elliottia pyroliflora Species 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
- E21B25/10—Formed core retaining or severing means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drill lifting type large-diameter well bottom in-situ pressure maintaining and coring drilling tool which comprises a positioning mechanism, a lifting mechanism, a pressure maintaining mechanism and a drill bit, wherein after the positioning mechanism is positioned, the lifting mechanism is triggered by throwing a ball to drive a ball valve in the pressure maintaining mechanism to overturn so as to realize the sealing of a core tube, and the drill bit is lifted to rotate along with a drill rod to obtain a core. The method aims at the problem that the gas storage capacity of a target stratum cannot be accurately evaluated due to the loss of gas in the core caused by large-diameter core extraction, and the core diameter can reach 85-150 mm. Meanwhile, the accuracy of matching the core property with the formation depth can be ensured by in-situ pressure maintaining and coring at the bottom of the well. The ball valve is adopted for sealing to ensure good sealing performance and pressure maintaining effect, so that in-situ fidelity exploitation of the bottom of the core is further realized, and the requirements on the pressure maintaining sealing performance of the drilling tool during exploration of certain gas deposits are particularly met. The invention can be applied to the fields of coal bed gas, shale gas, natural gas hydrate, conventional oil gas exploration and coring and the like.
Description
Technical Field
The invention relates to the technical field of pressure maintaining coring drilling tools, in particular to a drill lifting type large-diameter well bottom in-situ pressure maintaining coring drilling tool.
Background
In the resource exploration process, the parameter accuracy of reserve evaluation is solved, a calculation basis is provided for production, and the method is important for quickly and effectively obtaining stratum rock cores. At present, shale gas exploration and coal bed gas exploration sampling are performed by adopting a common rope salvage coring drilling tool to obtain samples, and the gas storage capacity of a target layer is evaluated according to the analysis result of the obtained samples. In the sampling process and the core transfer process, along with the reduction of the external pressure, the dissipation of gas in the core is accelerated, so that the gas storage amount of a target stratum cannot be accurately evaluated. In order to obtain more accurate formation information, it is generally required to obtain cores of the formation in situ and with precision.
At present, the existing mechanical pressure-maintaining coring and freezing pressure-maintaining coring can basically meet the conventional sampling requirements, but the pressure-maintaining coring drilling tool is generally of a three-layer tube structure due to the complex internal structure, so that all links in design, processing and use are strictly limited by space, and the diameter of the obtained core is generally smaller. Particularly, the diameter of a core obtained by a rope coring and pressure maintaining drilling tool used in the geological investigation fields of shale gas, natural gas hydrate, coal bed gas and the like is generally less than 48 mm. In addition, the inner drift diameter of the existing drill rod for petroleum, coal bed gas, shale gas, natural gas and the like does not meet the requirement of a large-diameter pressure-maintaining sampling drilling tool to pass through, so that the pressure-maintaining coring drilling tool adopting a rope coring mode is not suitable for the large-diameter drilling field.
With the rapid development of society, the supply of conventional fossil energy is more and more tense, and the demand for exploration and development of unconventional shale gas, coal bed gas and natural gas hydrate is increased day by day, so that the development of an in-situ pressure-maintaining coring drilling tool capable of accurately obtaining large-diameter bottom hole reserve parameters is urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a carry brill formula major diameter shaft bottom normal position pressurize coring drilling tool, includes positioning mechanism, lifting mechanism, pressurize mechanism and drill bit, positioning mechanism fixes a position the back, triggers the lifting mechanism through the bowling and drives the ball valve upset in the pressurize mechanism, realizes the airtight of core barrel to do rotary motion along with the drilling rod through promoting the drill bit and obtain the core.
Further, the positioning mechanism comprises an outer pipe, a pipe seat, a spring mandrel, a connecting shaft, a connecting pipe, an upper reamer and a lower reamer; the outer pipe is upwards connected with an upper drill rod, downwards connected with a connecting pipe through threads, a spring seat is arranged at the connecting position, a pulling spring is seated on the spring seat, the pulling spring is in a compressed state under the normal downward placement and coring state, and the base pipe and the spring mandrel are limited to move upwards through a limiting pin so as to limit the extension of the pulling spring; the seat tube is connected with the spring mandrel through welding, the spring mandrel is downwards connected with the connecting shaft through threads, and the upper reamer is upwards connected with the connecting pipe through threads.
Furthermore, an overflow hole is formed in the seat pipe.
Furthermore, a mud water outlet hole is formed in the spring mandrel.
Furthermore, the lifting mechanism comprises an upper thrust ball bearing, a copper sleeve, a lower thrust ball bearing, a suspension sleeve and a single-action copper sleeve, wherein the thrust ball bearing, the copper sleeve, the lower thrust ball bearing and the suspension sleeve are sequentially sleeved on the connecting shaft from top to bottom, and are limited and fixed through a gasket and a locking nut.
Further, the pressurize mechanism includes pressure-measuring pipe, pressure-maintaining pipe and ball valve, the bearing housing is equipped with to the bearing section outside of connecting axle, the bearing housing is downwards through threaded connection pressure-measuring pipe, the pressure-measuring pipe passes reducer union, reducer union is downwards through threaded connection well pipe, outwards through hanging the cover, the copper sheathing of single action is sat on the reamer with hanging the ring, go up the reamer and pass through threaded connection pressure-maintaining pipe downwards, the pressure-measuring pipe is downwards through threaded connection upper seal joint, the pressure-measuring joint is equipped with in the junction, upper seal joint is downwards through lower extreme female connection rock core coupling, adjusting nut is equipped with in the junction, the rock core coupling passes through outer threaded connection rock core pipe, there is the buffer spring who is fixed by gasket and lock nut in the joint.
Furthermore, an adjusting nut is arranged at the joint of the core pipe joint and the upper sealing joint and used for adjusting the axial position of the core pipe relative to the pressure maintaining pipe.
Further, the core tube part comprises an upper core tube and a lower core tube, the upper core tube and the lower core tube are connected through threads, and the wall thickness of the upper core tube is larger than that of the lower core tube.
Further, the bottom end of the lower core tube is connected with a clamp spring seat through threads, a clamp spring is arranged in the lower core tube, the lower core tube sequentially penetrates through a spring seat ring, a thrust spring seat, an upper ball valve seat, a ball valve, a lower ball valve seat, a buffer spring seat and a centering joint from top to bottom, the thrust spring is in a compressed state, the spring seat ring is upwards pushed to be seated on a step in the middle tube and downwards sleeved on the thrust spring seat, the thrust spring seat is abutted against the upper ball valve seat, the ball valve is arranged between the upper ball valve seat and the lower ball valve seat, a through hole is formed in the ball valve, two radial ends of the ball valve are flattened and provided with a ball valve limiting pin, the ball valve and the ball valve seat are arranged in a ball limiting tube, the ball limiting tube is upwards connected with the middle tube through threads, a sealing ring is arranged at the joint, the ball limiting tube is downwards connected with, and the lower reamer is connected with the lower ball valve seat, the centralizing joint is outwards seated on a suspension ring, the suspension ring is arranged at the upper part of the joint of the lower reamer and the drill bit, and the lower reamer and the drill bit are connected in a threaded manner.
Further, the diameter of the drill bit for obtaining the core of the rock is-mm.
Compared with the prior art, the invention has the beneficial effects that:
according to the drill lifting type large-diameter shaft bottom in-situ pressure maintaining and coring drilling tool, aiming at the problem that gas in a core cannot be accurately evaluated due to the loss of gas in the core caused by the large-diameter drill lifting and coring, a positioning mechanism is used for positioning and throwing balls to trigger a lifting mechanism and drive a ball valve in the pressure maintaining mechanism to overturn, the core tube is sealed, the environment is isolated, the core of the core is extracted through lifting a drill rod, and the coring diameter can reach 85-150 mm. The adoption of the drill extraction and coring reduces the requirements of pressure maintaining and coring on the drilling tool, and the existing drilling tool assembly does not need to be additionally changed. Meanwhile, the accuracy of matching the core property with the formation depth can be ensured by in-situ pressure maintaining and coring at the bottom of the well. The ball valve is adopted for sealing, and the sealing ring is arranged at the key part, so that good sealing performance and pressure maintaining effect are ensured, in-situ fidelity exploitation of the bottom of the well of the rock core is further realized, and the requirements on the pressure maintaining sealing performance of the drilling tool during exploration of certain gas deposits are particularly met. The invention can be applied to the fields of coal bed gas, shale gas, natural gas hydrate, conventional oil gas exploration and coring and the like.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a lifting drilling type large-diameter bottom hole in-situ pressure maintaining core drilling tool according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a drill-lifting type large-diameter bottom hole in-situ pressure maintaining coring drill tool in a normal tube lowering coring state according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a drill-lifting type large-diameter bottom hole in-situ pressure maintaining coring drilling tool in a ball-throwing recovery coring state according to an embodiment of the present invention.
Description of reference numerals:
1-a limit pin; 2-an outer tube; 3-an overflow hole; 4-a seat tube; 5-pulling the spring; 6-a spring mandrel; 7-slurry water outlet; 8-spring seats; 9-a connecting shaft; 10-upper thrust ball bearing; 11-a bearing sleeve; 12-a connecting tube; 13-copper sheathing; 14-lower thrust ball bearing; 15-a gasket; 16-a lock nut; 17-up-reamer; 18-piezometric tube; 19-hanging the sleeve; 20-single action copper sleeve; 21-a suspension ring; 22-a reducer union; 23-a pressure measuring connector; 24-upper sealing joint; 25-middle tube; 26-a pressure-maintaining tube; 27-adjusting the nut; 28-core tube joint; 29-a buffer spring; 30-a gasket; 31-a locking nut; 32-upper core barrel; 33-lower core barrel; 34-a spring seat ring; 35-a thrust spring; 36-a thrust spring seat; 37-ball-on-seat; 38-sealing ring; 39-ball valve; 40-ball valve limit pin; 41-a limiting groove; 42-lower ball valve seat; 43-ball limiting tube; 44-a buffer spring; 45-a buffer spring seat; 46-a suspension ring; 47-underreamer; 48-centralizing the joint; 49-a snap spring; 50-a clamp spring seat; 51-a drill bit; 52-trigger ball.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the invention provides a drill lifting type large-diameter in-situ pressure maintaining and coring drilling tool for a well bottom, which comprises a positioning mechanism, a lifting mechanism, a pressure maintaining mechanism and a drill bit, wherein after the positioning mechanism is positioned, the lifting mechanism is triggered by ball throwing to drive a ball valve in the pressure maintaining mechanism to turn over, so that the core tube is sealed, and the drill bit is lifted to rotate along with a drill rod to obtain a core.
Specifically, the positioning mechanism comprises an outer pipe 2, a pipe seat 4, a spring mandrel 6, a connecting shaft 9, a connecting pipe 12, an upper reamer 17, a lower reamer 47 and the like; the lifting mechanism comprises an upper thrust ball bearing 10, a copper sleeve 13, a lower thrust ball bearing 14, a suspension sleeve 19, a single-action copper sleeve 20 and the like, and the pressure maintaining mechanism comprises a pressure measuring pipe 18, a pressure maintaining pipe 26, a ball valve 39 and the like.
Wherein, the outer pipe 2 is connected with an upper drill rod upwards, the outer pipe is connected with a connecting pipe 12 downwards through a thread, a spring seat 8 is arranged at the joint, a pulling spring 5 is seated on the spring seat, the pulling spring 5 is in a compression state under the normal lowering and coring state, the seat pipe 4 and a spring mandrel 6 are limited to go upwards through a limiting pin 1 so as to limit the extension of the pulling spring 5, an overflow hole 3 is arranged on the seat pipe 4, a mud water outlet hole 7 is arranged on the spring mandrel 6, the seat pipe 4 is connected with the spring mandrel 6 through welding, the spring mandrel 6 is connected with a connecting shaft 9 downwards through a thread, an upper thrust ball bearing 10, a copper bush 13 and a lower thrust ball bearing 14 are sequentially sleeved on the connecting shaft 9 from top to bottom, the limitation and the fixation are realized through a gasket 15 and a locking nut 16, a bearing bush 11 is arranged outside the bearing section of the connecting shaft 9, the bearing bush 11 is connected with, the reducer union 22 is downwards connected with the middle pipe 25 through threads, outwards sits on the upper reamer 17 through the suspension sleeve 19, the single-action copper sleeve 20 and the suspension ring 21, the upper reamer 17 is upwards connected with the connecting pipe 12 through threads, the pressure maintaining pipe 26 is downwards connected, the pressure measuring pipe 18 is downwards connected with the upper sealing joint 24 through threads, the pressure measuring joint 23 is arranged at the joint, the upper sealing joint 24 is downwards connected with the core pipe joint 28 through lower end internal threads, the adjusting nut 27 is arranged at the joint, the core pipe joint 28 is connected with the upper core pipe 32 through external threads, the buffer spring 29 fixed by the gasket 30 and the locking nut 31 is arranged in the joint, the upper core pipe 32 is connected with the lower core pipe 33 through threads, the bottom end of the lower core pipe 33 is connected with the clamp spring seat 50 through threads, the clamp spring 49 is arranged in the lower core pipe 33, and the lower core pipe 33 sequentially penetrates through the spring seat ring 34, the thrust, An upper ball valve seat 37, a ball valve 39, a lower ball valve seat 42, a buffer spring 44, a buffer spring seat 45 and a centering joint 48, wherein the thrust spring 35 is in a compressed state, the spring seat ring 34 is pushed upwards to be seated on the step in the middle pipe 25 and is sleeved downwards on the thrust spring seat 36, the thrust spring seat 36 is pressed against the upper ball valve seat 37, the ball valve 39 is arranged between the upper ball valve seat 37 and the lower ball valve seat 42, a through hole is arranged in the ball valve 39, the radial two ends of the ball valve are flattened and provided with a ball valve limiting pin 40, the ball valve and the ball valve seat are arranged in a ball limiting pipe 43, the ball limiting pipe 43 is upwards connected with the middle pipe 25 through a thread, a sealing ring 38 is arranged at the joint, a limiting groove 41 is arranged on the ball limiting pipe 43 and is downwards connected with the centering joint 48 through a thread, the buffer spring seat 45 sleeved on the buffer spring 44 is arranged at the upper end of the centering joint 48 and is further, the suspension ring 46 is mounted on the upper portion of the joint between the under-reamer 47 and the drill bit 51, and the under-reamer 47 and the drill bit 51 are connected by means of a screw thread.
The drill bit comprises a connecting shaft 9, all parts on the upper part of the connecting shaft, an outer pipe 2 on the outer layer, a connecting pipe 12, an upper reamer 17, a pressure maintaining pipe 26, a lower reamer 47 and a drill bit 51 which all rotate along with a drill rod during normal drilling, and the lower part of the connecting shaft 9 cannot rotate along with the drill due to the existence of a single-action structure formed by the thrust ball bearing 10, the copper sleeve 13, the lower thrust ball bearing 14, the suspension sleeve 19 and the single-action copper sleeve 20.
Wherein the adjusting nut 27 is arranged at the joint of the core tube joint 28 and the upper sealing joint 24, and the axial position of the core tube part relative to the pressure-maintaining tube can be adjusted; the core tube part comprises an upper core tube 32 and a lower core tube 33, and the difference between the two parts is that the wall of the upper core tube 32 is thicker, so that the core tube can bear larger axial force when the core is extracted and drilled, the core tube is prevented from being broken by pulling, and the setting purpose of the buffer spring 29 is the same.
In the actual drilling and coring process, the drilling tool is in two states in sequence: normal drilling coring state and shot recovery coring state. Wherein the transition from the normal drill-down coring condition to the ball recovery coring condition is triggered by the throwing of a trigger ball 52 into the drill pipe internal passage.
In a normal drilling and coring state, as shown in fig. 2, in a designed core section of a drilling hole, the drilling tool drills in a normal core lowering and coring state, a core gradually enters a core tube, at the moment, the limiting pin 1 is in a set position, the pulling spring 5 is in a compression state, drilling fluid flows to the bottom of the hole through a channel in the drilling tool, the part below the connecting shaft 9 cannot rotate while drilling due to the single-acting structure formed by the thrust ball bearing 10, the copper sleeve 13, the lower thrust ball bearing 14, the suspension sleeve 19 and the single-acting copper sleeve 20, and the core gradually enters the core tube along with the footage of the drilling tool. Under the normal drilling and coring state, the drilling fluid passes through the inner channels of the seat pipe 4 and the spring mandrel 6 and enters the annular space of the outer casing pipe and the middle pipe through the mud water outlet hole 7 to flow to the bottom of the hole.
In the core shooting recovery coring state, as shown in fig. 3, when the core barrel is filled with the core, the core is firstly clamped by lifting the drill, then the trigger ball 52 is thrown to the inner channel of the drill rod, so that the drilling tool is switched to the core shooting recovery coring state, the trigger ball descends along the inner channel of the drill rod until reaching the upper end of the seat tube 4, the circulation channel of the drilling fluid is blocked, the trigger ball is pushed downwards under the action of inertia and mud pump pressure, the seat tube 4 is further pushed, the limit pin 1 is sheared under the action of thrust, the seat tube 4 and the spring mandrel 6 continue descending in a short time, so that the pulling spring 5 is further compressed, when the pulling spring 5 is compressed to a certain limit, the pulling force is rapidly increased in a short time, when the pulling force is large enough, the spring mandrel 6, the seat tube 4 and the trigger ball are pushed upwards, the seat tube 4 is pushed out of the outer tube, the whole internal structure of the drilling tool is further driven to sequentially run upwards from top to bottom, until the spring mandrel 6 reaches the highest position, the upper sealing joint 24 is tightly matched with the reducing joint 22 at the moment, the upper end in the middle pipe is sealed under the action of the sealing ring, meanwhile, the lower core barrel 33 and the clamp spring seat 50 are lifted away from an inner channel of the ball valve 39, the ball valve 39 moves downwards under the action of the thrust spring 35, the ball valve 39 turns over 90 degrees in the descending process due to the limitation of the ball valve limiting pin 40 and the limiting groove 41, the inner channel of the upper ball valve seat 37 is sealed, a sealed space is formed together with the ball limiting pipe 43, meanwhile, the lower end in the middle pipe is sealed by the sealing ring 38 arranged at the joint of the ball limiting pipe 43, the middle pipe 25, the ball limiting pipe 43 and the upper ball valve seat 37, and the in-situ bottom hole pressure maintaining of the core is realized.
Under the state of ball throwing, recovering and coring, the drilling fluid enters the inner channels of the seat tube 4 and the spring mandrel 6 through the overflow holes on the seat tube (4), enters the annular space of the outer casing and the middle tube through the slurry water outlet hole 7 and then flows to the bottom of the hole. And the drilling tool is maintained in a ball-throwing recovery coring state after ball throwing is triggered, and the core tube and the drill rod are lifted out for drilling under a good sealing pressure-maintaining environment, so that the bottom hole in-situ pressure-maintaining coring of the large-diameter core is realized.
Example 1
In order to realize large-diameter coring, taking a coring bit with the diameter of phi 216mm as an example, the inner diameter of the bit is 124mm, the diameter of an outer pipe is designed to be phi 194mm, the coring diameter is 85 mm-90 mm (the 90mm needs to be more compact in structure), the total length of a drilling tool is 3m, the length of a core pipe can reach 1.1m, and a core with the length of 0.50 m-1.00 m can be extracted by single drilling lifting. The limiting pin (1) is a brass pin with the diameter of 15mm (two), the maximum bearing shearing force is about 1 ton, and the shearing strength of the brass is calculated according to 30 MPa. The drilling tool supported by the pulling spring (5) has the self weight, the upward height of the pulling spring (5) reaches 380mm, namely the compressed length is 500mm, the extended length is 880mm, correspondingly, the upward height of the core barrel is 380mm, meanwhile, the length of the seat pipe (4) needs to reach 450mm, and under the normal drilling and coring state, the distance from the highest point of the upper end of the ball valve (39) to the lower end of the clamp spring seat (50) needs to reach 372.6 mm. The wire diameter of the pulling spring (5) is 12mm, the thread pitch is 100mm, the total length is 1000mm, the compression force is 92.16Kg when the spring is compressed to 880mm, and the compression force is 384Kg when the spring is compressed to 500 mm. The outer diameter of the ball valve (39) is preliminarily selected to be 155mm, the central hole is 96mm, and the coring diameter can reach 85 mm-90 mm.
Example 2
In order to realize large-diameter coring, taking a coring bit with the diameter of phi 311mm as an example, the inner diameter of the bit is 214mm, the diameter of a coring outer tube is designed to be phi 298mm, the coring diameter can reach 145 mm-150 mm (the structure is required to be more compact for 150 mm), the total length of an in-situ pressure-maintaining coring drilling tool is 3.2m, the length of a core tube can reach 1.1m, and a core with the diameter of 0.50 m-1.00 m can be extracted by single drilling. The limiting pin 1 is a brass pin, the shearing strength of the limiting pin is calculated according to 30MPa, the diameter of the limiting pin is 15mm (two or three), and the maximum shearing force is about 1 ton. The dead weight of the drilling tool supported by the pulling spring 5, the height of the upward spring of the pulling spring 5 reaches 380mm, namely the length after compression is 500mm, the length after extension is 880mm, correspondingly, the upward height of the core barrel is 380mm, meanwhile, the length of the seat tube 4 needs to reach 450mm, and under the normal drilling and coring state, the distance from the highest point of the upper end of the ball valve 39 to the lower end of the jump ring seat 50 needs to reach 372.6 mm. The pull-up spring 5 is designed and installed so that the wire diameter is 12mm, the thread pitch is 100mm, the total length is 1000mm, the compression force is 92.16Kg when the spring is compressed to 880mm, and the compression force is 384Kg when the spring is compressed to 500 mm. The outer diameter of the ball valve 39 is initially selected to be 230mm, the center hole is 160mm, and the coring diameter is 140-150 mm.
It should be understood that the above description is only a preferred embodiment of the present invention, and is a part of the examples of the present invention, not all examples. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the principle of the present invention belong to the protection scope of the present invention. It will be apparent to those skilled in the art that other various changes and modifications can be made in the above-described embodiments and concepts, and all other embodiments obtained without inventive faculty are within the scope of the invention.
Claims (10)
1. The drill lifting type large-diameter in-situ pressure maintaining and coring drilling tool at the bottom of a well is characterized by comprising a positioning mechanism, a lifting mechanism, a pressure maintaining mechanism and a drill bit, wherein after the positioning mechanism is positioned, the lifting mechanism is triggered by throwing a ball to drive a ball valve in the pressure maintaining mechanism to overturn so as to realize the sealing of a core tube, and the drill bit is lifted to rotate along with a drill rod to obtain a core.
2. The lift-drill, large-diameter bottom-hole, in-situ, pressure-holding, coring tool of claim 1, wherein the positioning mechanism comprises an outer tube (2), a tube seat (4), a spring mandrel (6), a connecting shaft (9), a connecting tube (12), an upper reamer (17), and a lower reamer (47); the outer pipe (2) is upwards connected with an upper drill rod, downwards connected with a connecting pipe (12) through threads, a spring seat (8) is arranged at the connecting position, a pulling spring (5) is seated on the spring seat, the pulling spring (5) is in a compressed state in a normal downward-placing and coring state, the seat pipe (4) and a spring mandrel (6) are limited to move upwards through a limiting pin (1), and then the pulling spring (5) is limited to extend; the seat tube (4) is connected with the spring mandrel (6) through welding, the spring mandrel (6) is downwards connected with the connecting shaft (9) through threads, and the upper reamer (17) is upwards connected with the connecting tube (12) through threads.
3. The lift-drill large-diameter bottom-hole in-situ pressure-maintaining core drill according to claim 2, characterized in that the seat pipe (4) is provided with an overflow hole (3).
4. The lift-drill large-diameter bottom-hole in-situ pressure-maintaining core drill tool according to claim 2, wherein the spring mandrel (6) is provided with a slurry water outlet hole (7).
5. The drill-lifting type large-diameter well bottom in-situ pressure-maintaining and coring drill tool according to claim 2, characterized in that the lifting mechanism comprises an upper thrust ball bearing (10), a copper sleeve (13), a lower thrust ball bearing (14), a suspension sleeve (19) and a single-action copper sleeve (20), wherein the thrust ball bearing (10), the copper sleeve (13), the lower thrust ball bearing (14) and the suspension sleeve (19) are sequentially sleeved on the connecting shaft (9) from top to bottom, and are limited and fixed through a gasket (15) and a locking nut (16).
6. The drill-lifting type large-diameter in-situ pressure maintaining and coring drilling tool as claimed in claim 5, wherein the pressure maintaining mechanism comprises a pressure measuring pipe (18), a pressure maintaining pipe (26) and a ball valve (39), a bearing sleeve (11) is mounted outside a bearing section of the connecting shaft (9), the bearing sleeve (11) is connected with the pressure measuring pipe (18) downwards through a thread, the pressure measuring pipe (18) penetrates through a reducer union (22), the reducer union (22) is connected with a middle pipe (25) downwards through a thread, the bearing sleeve (11) outwards sits on an upper reamer (17) through a suspension sleeve (19), a single-action copper sleeve (20) and a suspension ring (21), the upper reamer (17) is connected with the pressure maintaining pipe (26) downwards through a thread, the pressure measuring pipe (18) is connected with an upper sealing joint (24) downwards through a thread, the pressure measuring joint (23) is mounted at the connection, the upper sealing joint (24) is, the adjusting nut (27) is arranged at the joint, the core tube joint (28) is connected with the core tube through external threads, and a buffer spring (29) fixed by a gasket (30) and a locking nut (31) is arranged in the joint.
7. A drill-lifting large-diameter bottom-hole in-situ pressure-maintaining core drill tool according to claim 6, characterized in that the joint of the core tube joint (28) and the upper sealing joint (24) is provided with an adjusting nut (27) for adjusting the axial position of the core tube section relative to the pressure-maintaining tube (26).
8. The pull-drill large-diameter bottom-hole in-situ pressure-maintaining core drill tool according to claim 7, wherein the core tube part comprises an upper core tube (32) and a lower core tube (33), the upper core tube (32) and the lower core tube (33) are connected by screw threads, and the wall thickness of the upper core tube (32) is greater than that of the lower core tube (33).
9. The drill-lifting type large-diameter well bottom in-situ pressure-maintaining and coring drill tool as claimed in claim 8, wherein the bottom end of the lower core barrel (33) is connected with a clamp spring seat (50) through a screw thread, a clamp spring (49) is installed in the lower core barrel, the lower core barrel (33) sequentially penetrates through a spring seat ring (34), a thrust spring (35), a thrust spring seat (36), an upper ball seat ring (37), a ball valve (39), a lower ball seat (42), a buffer spring (44), a buffer spring seat (45) and a centralizing joint (48) from top to bottom, the thrust spring (35) is in a compressed state, the spring seat ring (34) is upwards pushed to be seated on an inner step of the middle pipe (25) and downwards sleeved on the thrust spring seat (36), the thrust spring seat (36) abuts against the upper ball seat (37), the ball valve (39) is installed between the upper ball seat (37) and the lower ball seat (42), and a through hole is formed, the radial two ends are flattened and provided with ball valve limiting pins (40), a ball valve and a ball valve seat are arranged in a ball limiting pipe (43), the ball limiting pipe (43) is upwards connected with a middle pipe (25) through threads, a sealing ring (38) is arranged at the joint, a limiting groove (41) is formed in the ball limiting pipe (43), a centralizing joint (48) is downwards connected through threads, a buffer spring seat (45) sleeved with a buffer spring (44) is arranged at the upper end of the centralizing joint (48), the centralizing joint (48) is outwards seated on a suspension ring (46), the suspension ring (46) is arranged at the upper part of the joint of a lower reamer (47) and a drill bit (51), and the connection mode of the lower reamer (47) and the drill bit (51) is threaded connection.
10. The lift-drilling large-diameter bottom-hole in-situ pressure-maintaining core drilling tool according to claim 1, wherein the diameter of the drill bit to obtain the core is between 85mm and 150 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011558002.4A CN112627755A (en) | 2020-12-25 | 2020-12-25 | Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011558002.4A CN112627755A (en) | 2020-12-25 | 2020-12-25 | Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool |
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| CN112627755A true CN112627755A (en) | 2021-04-09 |
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| CN202011558002.4A Pending CN112627755A (en) | 2020-12-25 | 2020-12-25 | Lifting drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool |
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