CN86200075U - Hydraulic three-cylinder type core extractor - Google Patents

Abstract

The hydraulic three-cylinder type core extractor of the utility model is a coring tool for petroleum well drilling, which can be used to fetch cores at soft and hard formations. Besides the general structure of ordinary coring tool, the utility model is provided with a coring cutting mechanism which can erect claws during drilling and perform machinery pressurization during coring cutting to make the claws extend. The operation of machinery pressurization is controlled by a plurality of coring cutting control block tiles, a plurality of end to end core weather-proof housings which are convenient to be dismounted are added, an inner cylinder adopts a steel ball to support the cylinder to the right position, and telescopic rod hydraulic bit feed is adopted. The coring cutting of the utility model is reliable, the cores are convenient to be fetched, and the shock of the tool and the drill bit is small.

Description

Hydraulic three-cylinder type core extractor

The utility model is a kind of instrument that Process of Oil Well Drilling is obtained rock core that is used for.

The river formula core barrel in the core barrel of domestic use such as Sichuan, 8120 core barrels of Shengli Oil Field, the Q84-1 core barrel of Daqing oil field, the Liao Dynasty's 1 type core barrel of Liaohe Oil Field.External 250P type core barrel and NL industriseinc as Christenesn company, X-L oil tool co ltd, the core barrel of companies such as Diamond boart S, A.These core barrels are mainly by core bit, urceolus, inner core, clip, claw and connect inner/outer tube and enable in relative rotation suspension and form.The deficiency of this class coring tool is that the adaptation stratum is not extensive, and it is very unreliable to core, and takes out the rock core difficulty from inner core, often causes rock core level confusion.

The purpose of this utility model is to use this a kind of core barrel needs of just can scalable stratum coring, core except that can be used for hard formation, also can be used for soft formation and a little broken formation core, improve in these stratum rock core and collect rate and make the rock core level not chaotic.

Task of the present utility model is: adopt with fluid power and send the related jack catchs type pressurization of rig structure to cut the heart and can close the mechanism of core entry, the inner core steel ball is set upright, and increases one-level core barrel assembly.

The lower member that the utility model (Fig. 1) cuts concentric mechanism comprises cover 29 in claw 26, master jaw 27, bearing pin 28, claw gland 25, clip 24, hoop sleeve 23, lining 31, the drill bit.Wherein clip 24 is contained in the hoop sleeve 23 with conventional identical.Claw 26 is that an end has cutting edge, the other end is gradually big and the barred body of pin shaft hole arranged, claw 26 has several, circumferentially be contained on the master jaw evenly distributedly by the bearing pin garden, master jaw 27 is fixed in the drill bit 30, claw is holded up in the groove that inserts its top claw gland 25, each groove along garden Zhou Junbu is vertically, one inclined-plane is arranged to axial at groove top, when the top pressing mechanism is depressed inner core 19, when claw gland 25 moves down with its relative urceolus 18, this inclined-plane forces claw 26 to stretch out towards garden heart direction, claw 26 can cut rock core when rotating with urceolus 18, and the seal core inlet, prevents that rock core from coming off.

Fluid power send and bores pressing mechanism and compressed jump ring 15, guide pipe 4, stop up 11, plug for seal part 12, cut heart control retaining watts 7, rubber sleeve 8, retaining watt cover 9, stop up seat 10, spring 13 etc. and form by expansion link 1, cylinder barrel 3, seal 2, row duty block 5, return connector 6, nozzle assembly 14, nozzle.

Expansion link 1 top has tool joint thread and top drilling tool to join, insert in the cylinder barrel 3 its underpart, seal 2 both matching surfaces of sealing, can slide axially relatively between expansion link 1 and the cylinder barrel 3, and pass through spline, from all directions or the alternate manner transfer torque, the range of expansion link 1 by card thereon stroke dog 5 and the upper and lower step of cylinder barrel 3 inside control jointly, general the trip is got 0.4～1.5 meter or longer.Cylinder barrel 3 bottoms connect return connector 6 by screw thread, and return connector connects urceolus 18 6 times.Return connector 6 is cylindrical shells, the bottom is except that the centre is porose, also have several can adorn the aperture of nozzle 14, nozzle generally adopts Hardmetal materials, sealing ring is arranged on the external diameter, and internal diameter can be made different size according to the requirement of discharge capacity and the pressure of the drill and not wait as 8 millimeters, 9 millimeters, 10 millimeters, 12 millimeters, 13 millimeters.Nozzle is packed into and is compressed jump ring 15 lockings with nozzle behind the return connector.Stopping up seat 10 is hollow shafts, there is a larger-diameter outer garden upper end, the lower end is with the return connector centre bore identical nominal size and movingly elongated garden post with it to be arranged, spring 13 lower ends are contained on the endoporus shoulder of return connector, the upper end is supported and is stopped up seat 10, the elongated garden post that stops up seat inserts in the lower end centre bore that reaches return connector in the spring, seal is housed with two garden post face seals in the hole.Stop up the lower end that return connector is stretched out in seat 10 lower ends, and connect with drop-hanger bearing assembly 16 by screw thread.Seal 12 center seal hole and Wai Yuan and are passed through movingly in the centre bore that stops up seat 10 tops and outer big gap, garden, the bottom of stopping up 11.(cutting heart control), retaining watt cover 9 external members of several grooves that have been garden, side Zhou Shangkai, the bottom connects by screw thread with the obstruction seat, along garden Zhou Fangxiang several tiles arranged side by side are housed in the cover and cut heart control retaining watts 7, one inclined plane is arranged at the top of inside recessed one side, to the cambered surface top of outer lug one rectangle boss is arranged, the boss that cuts on the heart control retaining watts 7 inserts in the groove of retaining watt cover 9, stop up before 11 inputs, the contraction of cutting the rubber sleeve 8 on the heart control retaining watt makes cuts the external surface that heart control retaining watts 7 does not expose retaining watt cover 9, cutting heart control retaining watt 7 one sides towards retaining watt cover axle center is inclined-planes, stop up 11 drop into after, stop up 11 down the conical surfaces and oppress this inclined-plane and make the boss that cuts heart control retaining watts 7 stretch out the external surface of retaining watt cover 9.

After coring tool is gone into well, stop up 11 during punching and do not drop into, it is unimpeded stopping up seat 10 internal water mains.Slurry flows is washed through rock core protection tube 20.Because expansion link 1 lower end diameter of bore is greater than retaining watt cover 9 outer garden diameters, so the moving up and down and to make retaining watt cover 9, stop up 11 and inner core 19 is depressed and claw 26 stretches out of expansion link 1 this moment.Only after having washed the hole, before core-drilling begins, just will stop up 11 and throw into by the drilling rod hydrophthalmia and to stop up on the seat 10, under the mud differential pressure action, stop up the inclined-plane that heart control retaining watts 7 is cut in 11 down garden conical surface compressings, a surface, outer garden that makes the boss that cuts heart control retaining watts 7 stretch out retaining watt cover 9.Before several the external garden of boss diameters that cut heart control retaining watts 7 stretch out less than, stretch out the back greater than expansion link 1 lower end diameter of bore.When expansion link came downwards to its end of travel, retaining watts 7 was depressed in expansion link 1 lower surface, made that to stop up seat 10 descending simultaneously together with inner core 19 grades, promoted claw 26 and stretched out and cut the heart.

Retaining watt cover 9 top be equipped with internal diameter be a bit larger tham stop up 11, external diameter is less than the endoporus of expansion link 1, length is greater than the thin-walled guide pipe 4 of the stroke of expansion link 1, the endoporus of expansion link 1 is inserted in its upper end.Guide pipe 4 can be convenient to stop up successfully arrive and stop up seat.Spring 13 is used to support the gross weight of whole inner core 19 assemblies when core-drilling, and allows the descending segment distance of inner core when cutting the heart.

During normal core-drilling, slurry flows is crossed unique passage on the return connector 6---nozzle 14, form hydraulic pressure difference, this differential pressure action is on return connector 6 and fluid cylinder 3, produce downward thrust, be exactly the pressure of the drill, promote the part of coring tool except that expansion link 1 and creep into downwards, and play the cushioning effect of drill bit and coring tool itself.

The utility model has increased the rock core protection tube 20 of thin-walled garden tubulose in inner core, be divided into the number joint, superposes up and down between every joint to link with screw thread or mutual insertion of notch.Rock core is topmost protected tube 20 internal diameters than inner core top connection 17 lower end Cylinder external diameters greatly slightly, and rock core protection tube can loosely be inserted in this Cylinder spaciously, and can move up and down a segment distance.The maximum outside diameter of rock core protection tube 20 is littler 2～6 millimeters than inner core minimum diameter, so that rock core protection tube 20 can insert easily or extract out and don't be very spacious moving.Rock core protection tube 20 internal diameters are big 3～8 millimeters than drill bit core entry place internal diameter.

Array steel ball (steel ball of ball bearing) formula centralizer (also can have on the drop-hanger bearing) is housed on the inner core 19 outer gardens, make inner core 19 keep neutrality also can be rotated flexibly to urceolus 18, steel ball support 21 is rectangular blocks (see figure 2)s that have elongated slot, three or more one group, evenly be welded in tube 19 outer gardens on week, steel ball support 21 length directions are consistent with inner core 19 axis directions.Groove A inner wide and outer narrow, promptly inner than groove A near the groove A partial width of steel ball rack outer surface is wide, wide place is bigger slightly than steel ball 22 diameters, the wide place degree of depth is greater than the radius of steel ball 22, narrow place width is less than the diameter of steel ball 22, and the narrow place degree of depth is very shallow, is generally 1～3 millimeter, wide place and narrow place degree of depth sum should be less than steel ball 22 diameters, and recommending ratio between two is 3/5～4/5.The following method of definite foundation of the diameter of steel ball 22, the diameter sum of two steel balls 22 add inner core 19 outer garden diameter should less than but near the internal diameter of urceolus 18.There is a hole B greater than the diameter of steel ball 22 groove A upper end, perhaps makes a bit of inside and outside width unanimity in groove A top, and steel ball 22 can be put into by hole B.

Hoop sleeve 23 usefulness screw threads are connected on the inner core 19, the runway that the twice steel ball is arranged on the outer garden of hoop sleeve 23 bottoms, the twice steel ball runway identical with hoop sleeve 23 arranged in the claw gland 25 top endoporus, claw gland 25 is movingly with hoop sleeve 23, steel ball 32 is that the aperture on the garden drops into respectively the twice steel ball runway outside claw gland 25, block aperture with pin again after dropping into steel ball, during the drill bit rotation, steel ball 32 can only roll in runway and can not transfer torque, so just can keep inner core not rotate.Isolate drill bit to the inner core turning effort.

Be the operation sequence summary below.After coring tool assembling, adjustment finish, pull on rig floor and carry out drilling assembly, be preferably in the coring tool top and connect a centralizer, connect the drill collar that adapts with hole diameter then, the drill collar number is the same with coring tool commonly used, also can suitably reduce a bit.Go into punching behind the well.Intact back termination of pumping elicites the shaft bottom, marking A on kelly bar with the pressure of the drill of 2～4 tons.On carry drilling tool, unload kelly bar, obstruction is cast, connect kelly bar.Turn on pump, after about tens minutes (with well depth and pump amount different, the time changes to some extent), pump pressure several 10 kilograms per centimeter that raise suddenly ²The time, illustrate that stopping up 11 has entered instrument, and will stop up seat 10 central passages and block, can creep into.Slowly transfer drilling tool to 150～200 millimeters places, mark A top, check brake lever, turn on pump is driven rotating disk and is crept into, and regulates discharge capacity slightly, makes that pointer refers on required the pressure of the drill on the pressure of the drill table.Under the constant situation of pump pressure and the pressure of the drill shown in the weight indicator descend significantly before in a period of time the driller need not hold up brake lever, the top drilling tool is not descending, coring tool is in the auto-feed state.Finish when a stroke creeps into, when expansion link 1 all stretched, the pressure of the drill reading can reduce gradually and goes to zero on the weight indicator.After confirming that expansion link 1 all stretches out, transfer drilling tool again No. one time, carry out next stroke, until finishing coring footage.Notice that each run will (expansion link all stretches) could begin after a last stroke is all finished, transfer length must not be greater than 4/5 of total kilometres at every turn.

For hard formation, termination of pumping when cutting the heart is earlier transferred drilling tool, is pressed in until expansion link 1 and cuts on the heart Stroke Control retaining watts 7 (having this moment pump pressure to show), starts rotating disk and transfers (not turn on pump) with the pressure of the drill of 3～4 tons, intermittently drives pump with the cooling drill bit.At this moment claw 26 cuts out a ring recess on rock core, on carry drilling tool and pull out the heart, the weight indicator reading generally should great changes have taken place, upper and lower then reciprocal lifting drilling tool is confirmed to pull out of hole immediately after rock core is entirely in tube for several times, coring finishes.Soft formation and broken formation cut heart class of operation like hard formation.It is shorter that just the heart time is cut in pressurization, the not turn on pump of trying one's best, and weight indicator does not have big variation when pulling out the heart.

The utility model has the advantages that, by hydraulic pressure difference formation the pressure of the drill of mud, automatic bit feed on LAP, the vibrations that slowed down core bit 30 and coring tool itself, protection drill bit (especially diamond bit), and improve core recovery.Use expansion link 1 that hydraulic automatic send the rig structure and realize that pressurization cuts the heart, rock core claw 26 is holded up when flat, does not influence rock core and normally enters.Cut behind the heart claw and can keep stretching out state and seal inlet, prevent that rock core from coming off.Rock core protection tube makes removal of core more convenient.Steel ball centralizer frictional force is little, sets upright reliable.

Claims (6)

1, a kind ofly forms the fluid power that is used for oil drilling by expansion link 1, cylinder barrel 3, return connector 6, inner core 19, urceolus 18, drop-hanger bearing assembly 16, clip 24, hoop sleeve 23, drill bit 30 and send and bore three cartridge type coring tools, it is characterized in that having several to be installed in the core barrel bottom, holding up at ordinary times of drill bit 30 inside, and catch jacket 25 is together with inner core 19 when descending, the claw 26 that can stretch out to the center along the inclined-plane on claw gland 25 grooves.

2, send brill three cartridge type coring tools according to the said fluid power of claim 1., it is characterized in that having several watts shape, what have the conical surface and boss cuts heart control retaining watts 7, other has garden retaining watt cover 9 with the garden shell-like of several notches on week, cut heart control retaining watt 7 circumferential distributions and be contained in the retaining watt cover 9, its boss inserts and keeps off watt notch of cover 9.

3, send brill three cartridge type coring tools according to the said fluid power of claim 1.2., it is characterized in that the total weight of said inner core 19 and drop-hanger bearing assembly 16 is suspended on the interior spring 13 of return connector.

4, send brill three cartridge type coring tools according to the said fluid power of claim 1.2., it is characterized in that along garden Zhou Fangxiang several steel balls 32 that queue every action usefulness being housed between hoop sleeve 23 and the claw gland 25.

5, send brill three cartridge type coring tools according to the said fluid power of claim 1., it is characterized in that said inner core 19 external surfaces are equipped with several microscler shape, the steel ball support 21 of middle fluting is equipped with steel ball 22 in support.

6, send according to the said fluid power of claim 1. and bore three cartridge type coring tools, it is characterized in that having the number joint all-in-one-piece of connecting up and down to be contained in tubulose rock cores protection tube 20 in the said inner core 19, between each rock core protection tube with thread connection.

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