CN102678072B - Torque-bearing slip assembly for continuous circulation systems - Google Patents

Abstract

A torque-bearing slip assembly for continuous circulation systems is applied to petroleum drilling wellheads. The torque-bearing slip assembly mainly comprises a power slip, a rotary drive bushing, a pair of torque-bearing connecting plates and four torque-bearing pins. The power slip is mounted in the rotary drive bushing, and the outer conical surface of the power slip is in contact with the inner conical surface of the rotary drive bushing; a top flange of the shell of the power slip is located on the tops of bearing beams, the pair of torque-bearing connecting plates are located upon the rotary drive bushing and under the flange of the power slip, and are connected with the rotary drive bushing through the four torque-bearing pins, and U-shaped channels on the torque-bearing connecting plates ride on crossbeams of main bases. As a single is connected, the torque-bearing slip assembly can be utilized to hold a drill string and bear the weight of the drill string, the bearing beams are utilized to convert the lift force of drilling fluid into holding force applied on the drill string by the power slip, consequently, the adverse affection of the lift force of the drilling fluid on the holding capability is eliminated, and reverse torque needed by break-out is provided.

Description

Continuous Circulation Drilling System can bearing torque slip system

Technical field

The present invention relates to oil drill equipment technical field, particularly a kind of slips of drilling well-head special use, specifically can bear the slips of shackle reaction torque in a kind of Continuous Circulation Drilling System.

Background technology

At present, during conventional drilling operation, before making up a joint, must first close high-pressure pump, stop circulation of drilling fluid, when completing, make up a joint after operation, restart high-pressure pump and recover circulation of drilling fluid.When circulation of drilling fluid stops, negative surge pressure and landwaste sedimentation that shaft bottom produces, very easily cause the accidents such as well kick, gas cut, cave-in and bit freezing; After making up a joint, restart high pressure drilling pump, re-establish circulation of drilling fluid, the positive surge pressure now causing in shaft bottom may surpass formation fracture pressure, causes drilling fluid leakage.Therefore conventional circulation of drilling fluid mode cannot meet the drilling well demand of the bad grounds such as narrow drilling fluid density window.

In order to address the above problem, first to have proposed the concept of continuous cyclic drilling (ContinuousCirculation System) abroad, and applied for Patents (US6591916B1, US6315051B1, CA2550981A1).Develop afterwards continuous circulation system model machine abroad, and successfully realized commercial applications (SPE102851, SPE102859, SPE90702), become an advanced technical equipment.External continuous circulation system is mainly by main frame, part flow arrangement, power unit and composition of the control system.Main frame is the core of continuous circulation system, mainly comprise Power Tong (Iron roughneck), compensating chain device (Snubber), three blowout preventer set (BOP) and bottom power slip (Power slip) etc., wherein Power Tong has spinner, links closely and shackle function, compensating chain device and Power Tong interoperation, complete accurate make-up and the upper shackle operation of tool joint simultaneously; Blowout preventer set is comprised of first envelope, middle full envelope and second inside back cover group ram preventer, can form airtight cavity around in tool joint, and the opening and closing movement that utilizes first envelope of blowout preventer set, middle full envelope coordinates part flow arrangement to complete the switching of circulation of drilling fluid passage, realize the continuous circulation of the operating period drilling fluid that makes up a joint; Bottom power slip, for bearing drill string suspending weight, and provides shackle reaction torque.

While making up a joint upper shackle, bottom power slip is clamped bottom drilling rod body, and whole drill string weight is acted on rotary bushing by power slip, and bottom power slip also provides upper shackle required reaction torque as back-up tong simultaneously.

External continuous circulation system bottom power slip weak point is in the process of shackle operation on host implementation drilling rod, be stuck in the bottom power slip on drilling rod body, not only to bear the weight of whole drill string, also to provide upper shackle reaction torque as back-up tong, cause damaging drilling rod body, even may cause the major accident such as drill rod breaking in drilling process.In addition, because top masterpiece on the drilling fluid producing in upper shackle process is for main frame Power Tong, make main frame be subject to active force upwards, cause bottom power slip to there is the trend moving upward, its chucking power to drilling rod is reduced, in the time of may causing shackle, slips skids and unloads not open button, even occurs that drilling string not well braked accident occurs in drill string downslide.

Summary of the invention

The object of the invention is: the slip system that a kind of Continuous Circulation Drilling System can bearing torque is provided, the weight that can clamp drill string, bear whole drill string, utilize carrier bar that top power on drilling fluid is converted into the chucking power of power slip to drill string, eliminate the adverse effect of top power to slips clamping ability on drilling fluid, by bearing torque junction plate, main frame is connected with rotary bushing, for main frame provides upper shackle reaction torque, effectively improve the safety and reliability of upper shackle operation.Solution Continuous Circulation Drilling System is in the processing safety problem of the operating period that makes up a joint, simultaneously for Continuous Circulation Drilling System main frame provides a kind of conveniently fixed form.

The technical solution used in the present invention is: the slip system that Continuous Circulation Drilling System can bearing torque, is mainly comprised of a power slip, rotary bushing, a pair of bearing torque junction plate and four bearing torque pins.Wherein: power slip is arranged in rotary bushing, the male cone (strobilus masculinus) of power slip lower end contacts with the inner conical surface of rotary bushing upper end; During use, power slip housing upper flange is positioned at the top of carrier bar, a pair of bearing torque junction plate be positioned at rotary bushing power slip above wing plate below, and be connected with rotary bushing by four bearing torque pins, U-shaped groove during use on bearing torque junction plate straddles on the crossbeam of main machine base.

Described power slip, is comprised of one group of cylinder, one group of dental lamina, leverage and housing.Dental lamina is wedge structure, and lateral surface is arc surface, and medial surface has slip insert; In housing, be taper seat, outside top is square, and top has two wing plates in left and right.The piston rod of cylinder is connected with dental lamina by leverage; Dental lamina arc surface contacts with housing inner conical surface; Cylinder is placed in housing.During use, two wing plates are positioned at the top of two carrier bars, and the left and right side of square shell contacts with the medial surface of carrier bar.By carrier bar, the upper top power on main frame is passed to power slip, and the relative position of definite main machine base and rotating disk.

Described rotary bushing, inside is two sections cone structure, and outer upper ends is square structure, and lower end is ladder cylindrical surface structure, and upper surface has four uniform cylindrical holes perpendicular to upper surface.

Described bearing torque junction plate be one with the plate of warp architecture, curved end is U-shaped groove structure, the other end is interior arc-shaped structure, near arc edge, there are two symmetrical flat square grooves, during installation, flat square groove blocks the top of bearing torque pin, and during use, U-shaped groove straddles on the crossbeam of main machine base, and reaction torque is passed to bearing torque pin by bearing torque junction plate.

Bearing torque pin is cylinder, is divided into upper and lower two parts, and the cross section of top square body is rectangle, and the cross section of lower cylindrical body is circular.Lower cylindrical body is in the pin-and-hole of rotary bushing, and top square body is in the flat square groove of bearing torque junction plate.Bearing torque junction plate is connected by bearing torque pin with rotary bushing.During use, reaction torque is passed to rotating disk by rotary bushing.

When installing and working, the present invention and continuous circulation main machine base and carrier bar are used in conjunction with.

Summary Continuous Circulation Drilling System can bearing torque peace loading, unloading drilling rod and the process that makes up a joint of slip system, be conducive to understand the present invention.

1, installation process: consult Fig. 3 and Fig. 4

First, rotary bushing 2 is put into rotating disk 23, carrier bar 6 is connected with main machine base 5 by bolt; Then, main machine base 5 is placed on rotating disk 23, and to take rotating disk 23 center be symmetric points, carrier bar 6 parallel with rig gate; The cylindrical end of four bearing torque pins 4 is inserted respectively in 4 pin-and-holes of rotary bushing 2; The U-shaped groove 21 of two bearing torque junction plates 3 is straddled respectively on two crossbeams 19 of main machine base 5, arc end is near the center of rotary bushing 2, the flat square end of four bearing torque pins is inserted in four flat square grooves 22 of two bearing torque junction plates 3, the left and right directions of main machine base is fixed; Finally, lay power slip 1, two parallel surfaces of the top square shell of power slip 1 are adjacent to the inner surface of two carrier bars 6, thereby main machine base 5 front and back are fixed, two, top wing plate 20 be placed on respectively two carrier bars 6 above, main machine base 5 is fixing up and down.

2, unload drilling rod process: consult Fig. 5:

First, promote top-drive drilling (being called for short: drive on top) and drill string, when drill string 7 is promoted to desired location, starts power slip 1 and clamp drill string 7, descend afterwards caving drive 18 make drill string 7 by 1 of power slip on rotating disk 10, now rotating disk 10 bears the weight of whole drill string 7, start back-up tong 9 in chamber and clamp tool joint 8, start Power Tong dental lamina 14 clamping tops simultaneously and drive lengthening joint 17, and close first envelope flashboard 24 and second envelope flashboard 25, between first envelope flashboard 24 and second envelope flashboard 25, form annular seal space, after closing epicoele bypass valve 27, open lower bypass valve 28, to the interior filling drilling fluid of cavity assembly 12 supercharging, when the pressure in cavity assembly 12 equates with standpipe pressure, utilizing drill pipe tong 15 to dismantle drill string 7 drives being connected of lengthening joint 17 with top, in unloading open procedure, cleaner for high-pressure drilling fluid produces upper top power to lengthening joint 17, on this, top power passes to balanced compensated fluid cylinder 13 by Power Tong dental lamina 14, by top power on this drilling fluid of fluid pressure balance of balanced compensated fluid cylinder, by balanced compensated fluid cylinder 13, passing through main machine frame 11, main machine base 5 and carrier bar 6, finally pass to the wing plate 20 of power slip 1, power slip 1 housing is produced to a pulling force making progress, because the conical surface effect of power slip 1 makes power slip 1 clamping drill string 7 more reliable.

Lengthening joint 17 is driven in top and be promoted to blind rams 26 tops; Close standpipe passage 23, after making drilling fluid completely interior by cavity of resorption bypass valve 28 inflow chambers, close blind rams 26, between first envelope flashboard 24 and blind rams 26, form the epicoele of isolation, between blind rams 26 and second envelope flashboard 25, form airtight cavity of resorption; Then open upper bypass valve 27, make upper chamber's off-load plasma discharge; After the off-load of definite upper chamber, open first envelope flashboard 24 and Power Tong dental lamina 14, promote top and drive 18, lengthening joint 17 is driven in top and lift from cavity assembly 12 and Power Tong 15, utilize balanced compensated oil cylinder 13 to transfer drill pipe tong 1 simultaneously, complete since then and unload drilling rod operation.

3, the process that makes up a joint: consult Fig. 6 and Fig. 7.

First, lengthening joint being driven in drilling rod and top is connected.Drilling rod 16 is hung in continuous circulation main frame cavity assembly 12, start power card dental lamina 14 and step up drilling rod 16, lower caving drives 18, starts top and drives the upper button of rotation, makes top drive lengthening joint 17 and is connected with drilling rod 16.In this process, Power Tong 15 is upper buckle back pincers, Power Tong 15 passes to main machine base 5 by main machine frame 11 by moment of torsion, and main machine base 5 passes to rotating disk 10 by bearing torque junction plate by moment of torsion by bearing torque pin 4 and rotary bushing 2, the reaction torque while bearing upper button by rotating disk 10.

Unclamp Power Tong dental lamina 14, Shang Tiding drives 18, makes drilling rod 16 lower contacts apart from 50mm on blind rams 26; With balanced compensated fluid cylinder 13, Power Tong 15 is promoted to certain altitude, starts Power Tong dental lamina 14 and clamp drilling rod 16, close first envelope flashboard 24 simultaneously; After closing epicoele bypass valve 27, open standpipe passage 23, to filling drilling fluid supercharging in the upper chamber of cavity assembly 12; When the pressure of upper chamber and lower chambers equates, open blind rams 26, upper chamber and lower chambers are communicated with; Close afterwards lower bypass valve 28, after drilling fluid passes through in standpipe passage 23 and drilling rod 16 inflow chambers completely, with Power Tong 15 and balanced compensated fluid cylinder 13, drive drilling rods 16 to dock with drill string 7, and complete button operation; Then open lower bypass valve 28 and make cavity off-load, open afterwards first envelope flashboard 24 and second envelope lock 25 plasma discharges; Finally open Power Tong dental lamina 14 and back-up tong 9, promote top and drive 18, unclamp power slip 1, complete stacks operation.

In operating process, cleaner for high-pressure drilling fluid will produce top power to drilling rod 16, on this, top power is by passing to balanced compensated fluid cylinder 13 by Power Tong dental lamina 14, by top power on this drilling fluid of fluid pressure balance of balanced compensated fluid cylinder, by balanced compensated fluid cylinder 13, passing through main machine frame 11, main machine base 5 and carrier bar 6, finally pass to the wing plate 20 of power slip 1, power slip 1 housing is produced to a pulling force making progress, because the conical surface effect of power slip 1 makes power slip 1 clamping drill string 7 more reliable.

Beneficial effect of the present invention: the invention provides the slip system that a kind of Continuous Circulation Drilling System can bearing torque, can be during making up a joint, utilize this device can clamp drill string, bear drill string weight, utilize carrier bar that top power on drilling fluid is converted into the chucking power of power slip to drill string, on elimination drilling fluid, top power is to clamping the adverse effect of ability and providing upper shackle required reaction torque.This power slip is connected with main frame by carrier bar, not only bears the weight of drill string, and has eliminated the impact of top power on slips clamping ability on drilling fluid; By bearing torque junction plate, main frame is connected with rotary bushing, the required reaction torque of upper shackle is married again on rotating disk and rotary base, for main frame provides upper shackle reaction torque, effectively improve the safety and reliability of upper shackle operation.This invention has improved the stress between slips and drill string, can effectively improve the security reliability of upper shackle operation, simultaneously for Continuous Circulation Drilling System main frame provides a kind of conveniently fixed form.

Accompanying drawing explanation

Fig. 1 is the slip system three-dimensional structure schematic diagram that Continuous Circulation Drilling System of the present invention can bearing torque.

Fig. 2 is the slip system structural profile schematic diagram that Continuous Circulation Drilling System of the present invention can bearing torque.

Fig. 3 is that the slip system that Continuous Circulation Drilling System can bearing torque is installed three-dimensional structure schematic diagram.

Fig. 4 is that the slip system that Continuous Circulation Drilling System can bearing torque is installed schematic top plan view.

What Fig. 5 represented is to start to unload drilling rod operation chart.

What Fig. 6 and Fig. 7 represented is the operation chart that makes up a joint.

In figure, 1-power slip; 2-rotary bushing; 3-bearing torque junction plate; 4-bearing torque pin; 5-main machine base; 6-carrier bar; 7-drill string; 8-tool joint; 9-back-up tong; 10-rotating disk; 11-main machine frame; 12-cavity assembly; The balanced compensated fluid cylinder of 13-; 14-Power Tong dental lamina; 15-Power Tong; 16-drilling rod; 17-drives lengthening joint in top; 18-drives on top; 19-crossbeam; 20-wing plate; 21-U type groove; The flat square groove of 22-; 23-standpipe passage; First envelope flashboard of 24-; Second envelope flashboard of 25-; 26-blind rams; The upper bypass valve of 27-; Bypass valve under 28-; 29-cylinder; 30-dental lamina; 32-leverage; 31-housing.

The specific embodiment

Embodiment 1: the slip system that a Continuous Circulation Drilling System can bearing torque of take is example, and the present invention is described in further detail.

Consult Fig. 2.Continuous Circulation Drilling System can bearing torque slip system mainly by a power slip 1, rotary bushing 2, a pair of bearing torque junction plate 3 and four bearing torque pins 4, formed.Wherein power slip 1 is arranged in rotary bushing 2, and power slip 1 male cone (strobilus masculinus) contacts with rotary bushing 2 inner conical surfaces; Power slip 1 housing upper flange 20 is positioned at the top of carrier bar 6, a pair of bearing torque junction plate 3 be positioned at rotary bushing 2 power slip 1 above wing plate 20 below, and be connected with rotary bushing 2 by four bearing torque pins 4, the U-shaped groove 21 on bearing torque junction plate 3 straddles on the crossbeam 19 of main machine base 5.

Described power slip 1, is comprised of one group of cylinder 29, one group of dental lamina 30, leverage 32 and housing 31.Dental lamina 30 is wedge structure, and lateral surface is arc surface, and medial surface has slip insert; In housing 31, be taper seat, outside top is square, and it is 80mm that top has two width in left and right, the wing plate 20 that thickness is 40mm.The piston rod of cylinder 29 is connected with dental lamina 30 by leverage 32; Dental lamina 30 arc surfaces contact with housing 31 inner conical surfaces; Cylinder 29 is placed in housing 31.Two wing plates 20 are positioned at the top of two carrier bars 6, and the left and right side of square shell contacts with the medial surface of carrier bar 6.By carrier bar 6, the upper top power on main frame is passed to power slip 1, and the relative position of definite main machine base and rotating disk 10.

Described rotary bushing 2, inside is two sections cone structure, and outer upper ends is square structure, and lower end is ladder cylindrical surface structure, and upper surface has the cylindrical hole that four uniform diameters perpendicular to upper surface are 40mm.

Described bearing torque junction plate 3 is plates that are 40mm with warp architecture thickness, curved end is U-shaped groove 21 structures, the other end is interior arc-shaped structure, near arc edge, there are two symmetrical flat square grooves 22, during installation, flat square groove 22 blocks the top square body of bearing torque pin 4, and U-shaped groove 21 straddles on the crossbeam 19 of main machine base 5, so that reaction torque is passed to bearing torque pin 4 by bearing torque junction plate 3.

Bearing torque pin 4 is cylinder, is divided into upper and lower two parts, and the cross section of top square body is rectangle, and the cross section of lower cylindrical body is circular.Lower cylindrical body is in the pin-and-hole of rotary bushing 2, and top square body is in the flat square groove 22 of bearing torque junction plate 3.Bearing torque junction plate 3 is connected by bearing torque pin 4 with rotary bushing 2.Reaction torque is passed to rotating disk 10 by rotary bushing 2.

When installing and working, the present invention and continuous circulation main machine base 5 and carrier bar 6 are used in conjunction with.

Claims (1)

1. the slip system that Continuous Circulation Drilling System can bearing torque, is characterized in that: mainly a power slip (1), a rotary bushing (2), a pair of bearing torque junction plate (3) and four bearing torque pins (4), consist of; Wherein: power slip (1) is arranged in rotary bushing (2), the male cone (strobilus masculinus) of power slip (1) lower end contacts with the inner conical surface of rotary bushing (2) upper end; A pair of bearing torque junction plate (3) be positioned at rotary bushing (2) power slip (1) above wing plate (20) below, and be connected with rotary bushing (2) by four bearing torque pins (4);

Described power slip (1), is comprised of one group of cylinder (29), one group of dental lamina (30), leverage (32) and housing (31); Dental lamina (30) is wedge structure, and lateral surface is arc surface, and medial surface has slip insert; In housing (31), be taper seat, outside top is square, and top has left and right two wing plates (20); The piston rod of cylinder (29) is connected with dental lamina (30) by leverage (32); Dental lamina (30) arc surface contacts with housing (31) inner conical surface; Cylinder (29) is placed in housing (31);

Described rotary bushing (2), inside is two sections cone structure, and outer upper ends is square structure, and lower end is ladder cylindrical surface structure, and upper surface has four uniform cylindrical holes perpendicular to upper surface;

Described bearing torque junction plate (3) be one with the plate of warp architecture, curved end is U-shaped groove (21) structure, the other end is interior arc-shaped structure, near arc edge, there are two symmetrical flat square grooves (22), during installation, flat square groove (22) blocks the top square body of bearing torque pin (4);

Bearing torque pin (4) is cylinder, is divided into upper and lower two parts, and the cross section of top square body is rectangle, and the cross section of lower cylindrical body is circular; Lower cylindrical body is in the pin-and-hole of rotary bushing (2), and top square body is in the flat square groove (22) of bearing torque junction plate (3); Bearing torque junction plate (3) is connected by bearing torque pin (4) with rotary bushing (2).