CN112627755B - Lifting drill type large-diameter well bottom in-situ pressure maintaining coring drilling tool - Google Patents
Lifting drill type large-diameter well bottom in-situ pressure maintaining coring drilling tool Download PDFInfo
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- CN112627755B CN112627755B CN202011558002.4A CN202011558002A CN112627755B CN 112627755 B CN112627755 B CN 112627755B CN 202011558002 A CN202011558002 A CN 202011558002A CN 112627755 B CN112627755 B CN 112627755B
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- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 239000011435 rock Substances 0.000 claims abstract description 10
- 230000007306 turnover Effects 0.000 claims abstract description 3
- 239000000725 suspension Substances 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003245 coal Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract 2
- 241000227287 Elliottia pyroliflora Species 0.000 description 7
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005070 sampling 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
- 238000011084 recovery Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 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
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 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 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 125000006850 spacer group Chemical group 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or 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 lifting drill type large-diameter well bottom in-situ pressure maintaining 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, a ball valve in the pressure maintaining mechanism is driven to turn over by a ball throwing trigger lifting mechanism, so that the sealing of a core barrel is realized, and the drill bit is lifted to perform rotary motion along with a drill rod to obtain a core. The invention aims at the difficult problem that the gas storage amount of a target stratum cannot be accurately evaluated due to the dissipation of the gas in the rock core caused by the core extraction of the large-diameter drill, and the core extraction diameter can reach 85-150 mm. Meanwhile, the accuracy of matching the core property with the stratum depth can be ensured by the in-situ pressure maintaining coring at the bottom of the well. The ball valve is adopted to seal, so that good tightness and pressure maintaining effect are ensured, well bottom in-situ fidelity exploitation of the rock core is further realized, and the pressure maintaining and sealing performance requirement of the drilling tool is particularly met in the exploration of certain gas reservoirs. The invention can be applied to the fields of coal bed gas, shale gas, natural gas hydrate, conventional oil and gas exploration coring and the like.
Description
Technical Field
The invention relates to the technical field of pressure-maintaining coring drilling tools, in particular to a lifting-drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool.
Background
In the resource exploration process, the accuracy of the parameters for reserve evaluation is solved, a calculation basis is provided for production, and it is important to quickly and effectively acquire stratum cores. At present, shale gas exploration and coal bed gas exploration and sampling are carried out by adopting a common rope to salvage a core drilling tool to obtain a sample, and the gas storage capacity of a target layer is evaluated according to the analysis result of the obtained sample. In the sampling process and the core transferring process, the dissipation of gas in the core is accelerated along with the reduction of the external pressure, so that the gas storage amount of a target stratum cannot be accurately evaluated. In order to obtain more accurate formation information, it is often desirable to obtain the core of the formation in situ and accurately.
At present, the existing mechanical pressure maintaining coring and freezing pressure maintaining coring basically can meet the conventional sampling requirements, but the pressure maintaining coring drilling tool is usually of a three-layer pipe structure due to the complex internal structure, and therefore, the diameter of the obtained rock core is generally smaller due to the strict spatial limitation in each link of design, processing and use. In particular to a core diameter obtained by a rope coring pressure maintaining drilling tool used in the geological investigation fields of shale gas, natural gas hydrate, coal bed gas and the like, which is generally smaller than 48mm. In addition, the prior drilling rod internal diameter of petroleum, coal bed gas, shale gas, natural gas and the like does not meet the passing requirement of a pressure-maintaining sampling drilling tool with a larger diameter, so that the pressure-maintaining coring drilling tool in a rope coring mode is not suitable for the field of large-diameter drilling.
With the rapid development of society, the supply of conventional fossil energy is more and more intense, and the demand for exploration and development of unconventional shale gas, coalbed methane and natural gas hydrate is increasing, so that the development of an in-situ pressure-maintaining core drilling tool capable of accurately obtaining large-diameter well bottom reserve parameters is urgent.
Disclosure of Invention
The invention provides a lifting-drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool aiming at the defects of the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
The utility model provides a carry and bore 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 ball valve upset in the lifting mechanism through throwing the ball and drives the pressurize mechanism to realize the airtight of core barrel to through lifting the drill bit and doing the gyration motion together with the drilling rod and obtain the core barrel.
Further, the positioning mechanism comprises an outer tube, a seat tube, a spring mandrel, a connecting shaft, a connecting tube, an upper reamer and a lower reamer; the outer pipe is connected with the upper drill rod upwards and connected with the connecting pipe downwards through threads, a spring seat is arranged at the connecting part, a pulling spring is arranged on the spring seat, and in a normal downward centering state, the pulling spring is in a compressed state, and the seat pipe and the spring mandrel are limited to move upwards through a limiting pin, so that the pulling spring is limited to stretch; 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 tube through threads.
Further, the seat tube is provided with an overflow hole.
Further, a mud water outlet hole is formed in the spring mandrel.
Further, the lifting mechanism comprises an upper thrust ball bearing, a copper bush, a lower thrust ball bearing, a hanging sleeve and a single-action copper bush, wherein the thrust ball bearing, the copper bush, the lower thrust ball bearing and the hanging sleeve are sequentially sleeved on the connecting shaft from top to bottom, and limitation and fixation are achieved through a first gasket and a first locking nut.
Further, the pressure maintaining mechanism comprises a pressure measuring pipe, a pressure maintaining pipe and a ball valve, a bearing sleeve is arranged outside a bearing section of the connecting shaft and is connected with the pressure measuring pipe downwards through threads, the pressure measuring pipe penetrates through a reducing joint, the reducing joint downwards passes through a middle pipe in threaded connection, the reducing joint is outwards arranged on the upper reamer through a hanging sleeve, a single-acting copper sleeve and a first hanging ring, the upper reamer is downwards connected with the pressure maintaining pipe through threads, the pressure measuring pipe downwards passes through an upper sealing joint in threaded connection, the pressure measuring joint is arranged at the joint, the upper sealing joint downwards passes through a core pipe joint in threaded connection with the lower end, an adjusting nut is arranged at the joint, the core pipe joint is connected with the core pipe through external threads, and a first buffer spring fixed by a second gasket and a second locking nut is arranged in the joint.
Further, 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 part relative to the pressure maintaining pipe.
Further, the core barrel part comprises an upper core barrel and a lower core barrel, the upper core barrel and the lower core barrel are connected through threads, and the wall thickness of the upper core barrel is larger than that of the lower core barrel.
Further, the bottom end of the lower core barrel is connected with a clamping spring seat through threads, a clamp spring is arranged in the lower core barrel, the lower core barrel sequentially passes through a spring seat ring, a thrust spring seat, an upper ball valve seat, a ball valve, a lower ball valve seat, a second buffer spring, a buffer spring seat and a centralizing joint from top to bottom, the thrust spring is in a compressed state, the spring seat ring is pushed upwards to be seated on an inner step of the middle pipe, the thrust spring seat is sleeved downwards on the thrust spring seat, the thrust spring seat is propped against the upper ball valve seat, the ball valve is arranged between the upper ball valve seat and the lower ball valve seat, the ball valve is internally provided with a through hole, the radial two ends of the ball valve are flattened and are provided with ball valve limiting pins, the ball valve and the ball valve seat are arranged in a ball limiting pipe, the ball limiting pipe is connected with the middle pipe upwards through threads, a sealing ring is arranged at the joint, a limiting groove is formed in the ball limiting pipe, the centralizing joint is downwards connected with the upper end of the centralizing joint, the buffer spring seat is sleeved with the second buffer spring seat, the centralizing joint is connected with the lower ball valve seat, the centralizing joint is outwards seated on the second suspension ring, the second suspension ring is arranged on the upper part of the reamer and the drill bit, and the drill bit is connected in a mode of threaded connection.
Further, the diameter of the core of the rock is between-mm.
Compared with the prior art, the invention has the beneficial effects that:
According to the lifting drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool provided by the invention, aiming at the difficult problem that gas in a rock core escapes due to the coring of a large-diameter lifting drill, the gas storage amount of a target stratum cannot be accurately evaluated, a positioning mechanism is adopted for positioning and ball throwing to trigger a lifting mechanism, a ball valve in a pressure-maintaining mechanism is driven to overturn, the sealing of a core barrel is realized, the environmental change is isolated, the rock core of the stratum is extracted by lifting a drill rod, and the coring diameter can reach 85-150 mm. The requirement of pressure maintaining coring on a drilling tool is reduced by adopting the drill extracting coring, and the existing drilling tool combination is not required to be additionally changed. Meanwhile, the accuracy of matching the core property with the stratum depth can be ensured by the in-situ pressure maintaining coring at the bottom of the well. The ball valve is adopted for sealing, and the sealing ring is arranged at the key position, so that good sealing performance and pressure maintaining effect are ensured, further, the in-situ fidelity exploitation of the bottom of the rock core is realized, and the pressure maintaining and sealing performance requirement of the drilling tool in the exploration of certain gas reservoirs is particularly met. The invention can be applied to the fields of coal bed gas, shale gas, natural gas hydrate, conventional oil and gas exploration coring and the like.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a lifting-drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a lifting-drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool in a normal pipe-down coring state according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a lifting-drill type large-diameter well bottom in-situ pressure-maintaining coring drilling tool in a ball-casting recovery coring state according to an embodiment of the present invention.
Reference numerals illustrate:
1-a limiting pin; 2-an outer tube; 3-overflow holes; 4-seat tube; 5-pulling out the spring; 6-spring spindle; 7-a mud water outlet hole; 8-spring seats; 9-connecting shafts; 10-upper thrust ball bearings; 11-a bearing sleeve; 12-connecting pipes; 13-copper sleeve; 14-a lower thrust ball bearing; 15-a first gasket; 16-a first lock nut; 17-up reamer; 18-pressure measuring tube; 19-hanging sleeve; 20-single-action copper sleeve; 21-a first suspension loop; 22-reducer union; 23-pressure measuring joint; 24-upper sealing joint; 25-middle tube; 26-pressure maintaining pipe; 27-adjusting the nut; 28-core pipe joint; 29-a first buffer spring; 30-a second gasket; 31-a second lock nut; 32-upper core barrel; 33-lower core barrel; 34-a spring seat ring; 35-a thrust spring; 36-thrust spring seat; 37-upper ball valve seat; 38-sealing rings; 39-ball valve; 40-ball valve limiting pins; 41-limit grooves; 42-lower ball valve seat; 43-bulb limiting tube; 44-a second buffer spring; 45-a buffer spring seat; 46-a second suspension loop; 47-underreamer; 48-righting the joint; 49-snap springs; 50-a clamping spring seat; 51-a drill bit; 52-trigger ball.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the invention provides a lifting-drilling type large-diameter well bottom in-situ pressure-maintaining 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, a ball valve in the pressure-maintaining mechanism is driven to turn over by a ball throwing trigger lifting mechanism, so that the sealing of a core barrel is realized, and the drill bit is lifted to perform rotary motion along with a drill rod to obtain a rock core.
Specifically, the positioning mechanism includes an outer tube 2, a seat tube 4, a spring spindle 6, a connecting shaft 9, a connecting tube 12, an upper reamer 17, a lower reamer 47, and the like; the pressure maintaining mechanism comprises a pressure measuring pipe 18, a pressure maintaining pipe 26, a ball valve 39 and other components.
Wherein the outer tube 2 is connected with an upper drill rod upwards, the lower part is connected with a connecting tube 12 through threads, a spring seat 8 is arranged at the connecting position, a pulling spring 5 is arranged on the connecting tube, in a normal core-releasing state, the pulling spring 5 is in a compressed state, the seat tube 4 and a spring mandrel 6 are limited to move upwards through a limiting pin 1, the pulling spring 5 is further limited to extend, an overflow hole 3 is arranged on the seat tube 4, a slurry water outlet 7 is arranged on the spring mandrel 6, the seat tube 4 and the spring mandrel 6 are connected through welding, the spring mandrel 6 is connected with a connecting shaft 9 downwards through threads, the connecting shaft 9 is sleeved with an upper thrust ball bearing 10, a copper sleeve 13 and a lower thrust ball bearing 14 in sequence from top to bottom, the limiting and the fixing are realized through a first gasket 15 and a first locking nut 16, a bearing sleeve 11 is arranged outside a bearing section of the connecting shaft 9, the bearing sleeve 11 is connected with a pressure measuring tube 18 downwards through threads, the tube 18 penetrates through a reducing joint 22, the reducer union 22 is downwards connected with the middle pipe 25 through threads, is outwards arranged on the upper reamer 17 through the hanging sleeve 19, the single-acting copper sleeve 20 and the first hanging ring 21, the upper reamer 17 is upwards connected with the connecting pipe 12 through threads, is downwards connected with the pressure maintaining pipe 26, 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 internal threads, the joint is provided with the adjusting nut 27, the core pipe joint 28 is connected with the upper core pipe 32 through external threads, the joint is internally provided with the first buffer spring 29 fixed by the second gasket 30 and the second locking nut 31, the upper core pipe 32 and the lower core pipe 33 are connected through threads, the bottom end of the lower core pipe 33 is connected with the clamping spring seat 50 through threads, the clamp spring 49 is arranged in the lower core pipe 33 sequentially penetrates through the spring seat ring 34 from top to bottom, the thrust spring 35, the thrust spring seat 36, the upper ball valve seat 37, the ball valve 39, the lower ball valve seat 42, the second buffer spring 44, the buffer spring seat 45 and the centralizing joint 48, the thrust spring 35 is in a compressed state, the spring seat ring 34 is pushed upwards to be seated on the inner step of the middle pipe 25, the thrust spring seat 36 is sleeved downwards on the thrust spring seat 36, the thrust spring seat 36 is propped against the upper ball valve seat 37, the ball valve 39 is installed between the upper ball valve seat 37 and the lower ball valve seat 42, a through hole is formed in the ball valve 39, two radial ends of the ball valve are flattened and are provided with ball valve limiting pins 40, the ball valve and the ball valve seat are installed in the ball limiting pipe 43, the ball limiting pipe 43 is connected with the middle pipe 25 upwards through threads, the sealing ring 38 is installed at the connecting position, the limiting groove 41 is formed in the ball limiting pipe 43, the centralizing joint 48 is connected downwards through threads, the buffer spring seat 45 sleeved on the second buffer spring 44 is installed at the upper end of the centralizing joint 48, the centralizing joint 48 is seated outwards on the second suspension ring 46, the second suspension ring 46 is installed on the upper part of the connecting part of the lower reamer 47 and the drill bit 51, and the lower reamer 47 is connected with the drill bit 51 through threads.
The upper parts of the connecting shaft 9, the outer tube 2, the connecting tube 12, the upper reamer 17, the pressure maintaining tube 26, the lower reamer 47 and the drill bit 51 of the outer layer are all rotated along with a drill rod in normal drilling, and the lower part of the connecting shaft 9 cannot rotate along with drilling due to the single-acting structure formed by the thrust ball bearing 10, the copper bush 13, the lower thrust ball bearing 14, the suspension sleeve 19 and the single-acting copper bush 20.
The joint of the core pipe joint 28 and the upper sealing joint 24 is provided with an adjusting nut 27, so that the axial position of the core pipe part relative to the pressure maintaining pipe can be adjusted; the core barrel part comprises an upper core barrel 32 and a lower core barrel 33, and the difference between the two parts is that the wall of the upper core barrel 32 is thicker, so that the core barrel can bear larger axial force when extracting the core, the core barrel is prevented from being broken, and the purpose of arranging the first buffer spring 29 is the same.
In the actual drilling coring process, the drilling tool is in two states in sequence: and normally drilling and coring states and ball throwing and recovering and coring states. Wherein the transition from the normal drill-down coring condition to the ball-cast recovery coring condition is triggered by throwing trigger ball 52 into the interior passage of the drill pipe.
In the normal drilling and coring state, as shown in fig. 2, in the designed coring section of the drill, the drill drills in the normal drilling and coring state, the core gradually enters the core barrel, at this time, the limiting pin 1 is in the set position, the pull-out spring 5 is in the compressed state, the drilling fluid flows to the bottom of the hole through the inner channel of the drill, and the lower part of the connecting shaft 9, due to the existence of the single-acting structure formed by the thrust ball bearing 10, the copper bush 13, the lower thrust ball bearing 14, the suspension bush 19 and the single-acting copper bush 20, the rotation while drilling does not occur, and the core gradually enters the core barrel along with the footage of the drill. Under the normal drilling and coring state, the drilling fluid passes through the passages in the seat pipe 4 and the spring mandrel 6, enters the annular spaces of the outer sleeve and the middle pipe through the mud water outlet hole 7, and flows to the bottom of the hole.
In the ball throwing, recovering and coring state, as shown in fig. 3, when the core is filled in the core barrel, the core is clamped by the lifting drill, then the trigger ball 52 is thrown to the channel in the drill rod, so that the drill tool is converted to the ball throwing, recovering and coring state, the trigger ball descends to the upper end of the seat tube 4 along the channel in the drill rod one by one, the circulation channel of drilling fluid is blocked, the trigger ball is pushed downwards under the action of inertia and slurry pump pressure, the seat tube 4 is further pushed, the limiting pin 1 is sheared under the action of the pushing force, the seat tube 4 and the spring mandrel 6 continue to descend in a short time, the lifting spring 5 is further compressed, when the lifting spring 5 is compressed to a certain limit, the lifting force is rapidly increased in a short time, when the lifting force reaches 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 that the inside top-down of drilling tool links to each other in proper order of further drive goes upward together, until spring mandrel 6 reaches the highest position, at this moment upper seal joint 24 and reducing union 22 closely cooperate, and under the effect of sealing washer, realize the upper end in the well intraductal sealed, simultaneously lower core barrel 33 and card spring seat 50 lift off the internal passageway of ball valve 39, ball valve 39 moves down under thrust spring 35's effect, because ball valve spacer pin 40 and spacing groove 41's restriction, ball valve 39 overturns 90 in the descending process, the internal passageway of upper ball valve seat 37 has been sealed, and then form airtight space together with limit bulb 43, simultaneously, rely on limit bulb 43 and well pipe 25, limit bulb 43 and the sealing washer 38 of upper ball valve seat 37's junction installation, realize the lower extreme seal in the well intraductal, thereby realize the well bottom normal position pressurize of rock core.
In the ball throwing, recovering and coring state, drilling fluid enters the inner channels of the seat pipe 4 and the spring mandrel 6 through overflow holes on the seat pipe (4), enters the annular spaces of the outer sleeve and the middle pipe through the mud water outlet holes 7, and flows to the bottom of the hole. And after the ball throwing trigger, the drilling tool is maintained in a ball throwing recovery coring state, and the core barrel and the drill rod are lifted to drill holes together in a good sealing pressure maintaining environment, so that the in-situ pressure maintaining coring of the bottom of the large-diameter core is realized.
Example 1
In order to realize large-diameter coring, the invention takes a coring drill with the diameter of phi 216mm as an example, the inner diameter of the drill is 124mm, the diameter of the designed outer tube is phi 194mm, the coring diameter is between 85mm and 90mm (the 90mm needs to have a more compact structure), the total length of a drilling tool is 3m, the length of a core barrel can reach 1.1m, and a core with the diameter of 0.50m to 1.00m can be extracted by single lifting of the drilling tool. 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 self weight of the drilling tool supported by the lifting spring (5) is achieved, meanwhile, the lifting spring (5) is sprung up to 380mm in height, namely, the length after compression is 500mm, the length after extension is 880mm, the corresponding height of the core barrel moving upwards is 380mm, meanwhile, the length of the seat pipe (4) needs to be 450mm, and the distance from the highest point of the upper end of the ball valve (39) to the lower end of the snap spring seat (50) needs to be 372.6mm under the normal drilling coring state. When the pulling spring (5) is designed and installed, the wire diameter is 12mm, the screw pitch is 100mm, the total length is 1000mm, the compression force is 92.16Kg when the pulling spring is compressed to 880mm, and the compression force is 384Kg when the pulling spring is compressed to 500 mm. The outer diameter of the ball valve (39) is preliminarily selected to be 155mm, the center hole is 96mm, and the core diameter can reach 85 mm-90 mm.
Example 2
In order to realize large-diameter coring, the invention takes a coring drill with the diameter of phi 311mm as an example, the inner diameter of the drill is 214mm, the diameter of a designed coring outer tube is phi 298mm, the coring diameter can reach 145-150 mm (150 mm needs to have a more compact structure), the total length of an in-situ pressure-maintaining coring drilling tool is 3.2m, the length of a core barrel can reach 1.1m, and a single extracting drill can extract a core with the diameter of 0.50-1.00 m. The limiting pin 1 is a brass pin, the shear strength of the limiting pin is calculated according to 30MPa, the diameter of the limiting pin is 15mm (two or three limiting pins), and the maximum bearing shearing force is about 1 ton. The dead weight of the drilling tool supported by the lifting spring 5, the lifting spring 5 has a spring height of 380mm, namely a compressed length of 500mm, an extended length of 880mm, and a corresponding core barrel upward moving height of 380mm, meanwhile, the length of the seat pipe 4 needs to reach 450mm, and the distance from the highest point of the upper end of the ball valve 39 to the lower end of the snap spring seat 50 needs to reach 372.6mm under the normal drilling coring state. When the pulling spring 5 is designed and installed, the wire diameter is 12mm, the pitch is 100mm, the total length is 1000mm, the compression force is 92.16Kg when the pulling spring is compressed to 880mm, and the compression force is 384Kg when the pulling 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 core diameter is 140-150 mm.
It will be apparent that the foregoing is only a preferred embodiment of the invention, and is a partial, but not an all-inclusive, example of the invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the principles of the present invention belong to the protection scope of the present invention. It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which will be made without departing from the spirit and scope of the invention.
Claims (9)
1. The lifting drill type large-diameter well bottom in-situ pressure maintaining core drilling tool 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 ball valve in the pressure maintaining mechanism is driven to turn over by a ball throwing trigger lifting mechanism, so that the sealing of a core barrel is realized, and the drill bit is lifted to perform rotary motion along with a drill rod to obtain a core;
The positioning mechanism comprises an outer tube (2), a seat tube (4), a spring mandrel (6), a connecting shaft (9), a connecting tube (12), an upper reamer (17) and a lower reamer (47); the outer tube (2) is connected with an upper drill rod upwards and connected with a connecting tube (12) downwards through threads, a spring seat (8) is arranged at the connecting position, a pulling spring (5) is arranged on the connecting tube, the pulling spring (5) is in a compressed state in a normal downward core-taking state, and the seat tube (4) and a spring mandrel (6) are limited to ascend through a limiting pin (1), so that the pulling spring (5) is limited to stretch; 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.
2. The lifting-drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool as claimed in claim 1, wherein the seat pipe (4) is provided with an overflow hole (3).
3. The lifting-drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool according to claim 1, wherein a slurry outlet hole (7) is formed in the spring mandrel (6).
4. The lifting and drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool according to claim 1, wherein the lifting and driving 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 upper thrust ball bearing (10), the copper sleeve (13), the lower thrust ball bearing (14) and the suspension sleeve (19) are sleeved on the connecting shaft (9) from top to bottom in sequence, and are limited and fixed through a first gasket (15) and a first locking nut (16).
5. The lifting-drilling type large-diameter well bottom in-situ pressure-maintaining coring drilling tool according to claim 4, 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 arranged outside a bearing section of the connecting shaft (9), the bearing sleeve (11) is connected with the pressure measuring pipe (18) downwards through threads, the pressure measuring pipe (18) penetrates through a reducer union (22), the reducer union (22) is connected with a middle pipe (25) downwards through threads, the upper reamer (17) is connected with the pressure maintaining pipe (26) downwards through threads through a hanging sleeve (19), a single copper sleeve (20) and a first hanging ring (21), the pressure measuring pipe (18) is connected with an upper sealing joint (24) downwards through threads, the upper sealing joint (24) is connected with a core pipe joint (28) downwards through lower internal threads, the connecting position is provided with an adjusting nut (27), the core pipe joint (28) is connected with a core pipe through external threads, and a first buffer spring (29) fixed by a second gasket (30) and a second locking nut (31) is arranged in the joint.
6. The lifting and drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool as claimed in claim 5, wherein an adjusting nut (27) is arranged at the joint of the core barrel joint (28) and the upper sealing joint (24) and is used for adjusting the axial position of the core barrel part relative to the pressure maintaining pipe (26).
7. The lifting and drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool as claimed in claim 6, wherein the core barrel part comprises an upper core barrel (32) and a lower core barrel (33), the upper core barrel (32) and the lower core barrel (33) are connected through threads, and the wall thickness of the upper core barrel (32) is larger than that of the lower core barrel (33).
8. The lifting and drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool according to claim 7, wherein the bottom end of the lower core barrel (33) is connected with a clamping spring seat (50) through threads, a clamping spring (49) is arranged in the clamping spring seat, the lower core barrel (33) sequentially passes through a spring seat ring (34), a thrust spring (35), a thrust spring seat (36), an upper ball valve seat (37), a ball valve (39), a lower ball valve seat (42), a second 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 pushed upwards to seat on an inner step of the middle pipe (25), the thrust spring seat (36) is sleeved downwards on the thrust spring seat (36), the thrust spring seat (36) is propped against the upper ball valve seat (37), a ball valve (39) is arranged between the upper ball valve seat (37) and the lower ball valve seat (42), through holes are formed in the ball valve (39), two radial ends of the ball valve seat (40) are flattened and are arranged in the ball limiting ball valve seat (43), the ball valve (43) is connected with the middle pipe (25) through threads upwards, the connecting joint (38) is arranged at the connecting position limiting ball seat (43), and the upper ball seat (43) is connected with the upper limiting joint (41) through threads, the upper end of the righting joint (48) is provided with a buffer spring seat (45) sleeved with a second buffer spring (44) and then connected with the lower ball valve seat (42), the righting joint (48) is outwards seated on a second suspension ring (46), the second suspension ring (46) is arranged at the upper part of the joint of the lower reamer (47) and the drill bit (51), and the lower reamer (47) is connected with the drill bit (51) in a threaded manner.
9. The lifting and drilling type large-diameter well bottom in-situ pressure maintaining coring drilling tool of claim 1, wherein the diameter of the drill bit obtained rock core is 85-150 mm.
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| CN202011558002.4A CN112627755B (en) | 2020-12-25 | 2020-12-25 | Lifting drill type large-diameter well bottom in-situ pressure maintaining coring drilling tool |
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| CN113622849B (en) * | 2021-10-14 | 2022-01-25 | 陕西太合智能钻探有限公司 | Closed core drilling tool |
| CN114876394B (en) * | 2022-04-25 | 2024-04-19 | 西安石油大学 | Backflushing backflow buffer device for core collection |
| CN115162989B (en) * | 2022-08-22 | 2023-10-20 | 中国地质科学院勘探技术研究所 | Lifting drilling type pressure maintaining coring drilling tool |
| CN115822491B (en) * | 2022-09-09 | 2024-05-10 | 四川大学 | Moon large-depth in-situ coring while drilling device |
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| CN101798924A (en) * | 2010-03-25 | 2010-08-11 | 吉林大学 | Icebound type pressure-maintaining and temperature-preserving sampler |
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| CN109653696B (en) * | 2018-12-11 | 2023-09-22 | 广州海洋地质调查局 | Natural gas hydrate rotary pressure-maintaining coring device |
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| CN108756796A (en) * | 2018-05-30 | 2018-11-06 | 广州海洋地质调查局 | Drilling at the sea coring drilling with keep up pressure method |
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