Drilling Chokes Protect your well with dependable, secure pressure control
E N V I R O N M E N T A L S O L U T I O N S
M-I SWACO* chokes are precision-engineered for accurate well control under harsh, demanding conditions.
Features and Benefits 10k SUPERCHOKE*, 15k SUPERCHOKE, 20k SUPERCHOKE, 10k ESUPERCHOKE*, 15k ESUPERCHOKE • Designed with half-moon-shaped • Tungsten-carbide wear sleeves orifices that allow precise opening for increased in-service life, and closure absorbing the effects of abrasive downstream turbulence • Positive closure through overlap beyond the full-close position. • Ideal for onshore and Disc-to-disc design is not affected offshore applications by pressure drops or surges. • Can be controlled from either primary or optional auxiliary consoles 10k AUTOCHOKE*, 15k AUTOCHOKE • Automatically adjusts fluid flow to regulate casing pressure • Easy, predictable standpipepressure control • No need to fight controls during transition operations • No-leak shut-in with dual seal design (metal-to-metal and elastomer-to-metal)
• Rated for H2S service • Long life in severe service operations • Excellent flow characteristics • Self-cleaning orifice reduces plugging
Reliable, responsive performance under pressure ឣ
A P P L I C A T I O N S
Land or offshore conventional drilling; the special demands of Underbalanced Drilling (UBD), CoiledTubing Drilling (CTD), frac flowback and Managed-Pressure Drilling (MPD); Equivalent Circulating Density (ECD) control; H2S applications; and well-control and cleanup operations.
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When the pressure is on, our SUPERCHOKE and AUTOCHOKE technologies give you precise control, providing critical pressure management when you need it. Formation influx of high pressure has proven to be a long-standing, expensive, and potentially dangerous industry
challenge — one that will never cease. That’s why M-I SWACO engineers have put more than 50 yrs of skill and proven technical performance into choke development, providing operators with reliable, responsive control options to keep pressure in its place.
P R O B L E M S
During controlled-pressure drilling, management of formation pressures can be critical. An uncontrolled pressure influx can result in dangerous kicks and well-control problems.
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S O L U T I O N S
M-I SWACO solutions address all your well-control needs. SUPERCHOKE units for shutting in the well, determining circulating pressure, breaking circulation, maintaining constant casing and drill-pipe pressure; AUTOCHOKE units for breaking circulation and maintaining constant casing, drill pipe and set-point pressure; ESUPERCHOKE units for automated control.
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E C O N O M I C S
The reasonable costs associated with choke rental are more than offset by the control that can save your well. Well control is the most critical component in any drilling program.
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E N V I R O N M E N T A L
In addition to keeping your well free of kicks and blowouts, maximum control over fluid loss and reduced water requirements help to minimize a project’s environmental footprint.
The M-I SWACO AUTOCHOKE unit is ideal for use as a pressure-relief “valve” for frac flowback work.
The M-I SWACO AUTOCHOKE The M-I SWACO AUTOCHOKE unit provides automatic, precise pressure control. It is the best choke technology available today for UBD and MPD applications. The AUTOCHOKE unit regulates casing pressure automatically under all conditions for a wide range of tasks: regulating mud pump start-up or shutdown, making and breaking drill-pipe connections, or allowing mud/gas flows alternately through the choke. Stripping pipe is simpler and safer with the AUTOCHOKE unit due to its ability to maintain casing pressure. As drill pipe is lowered into the hole, an equal volume of fluid under pressure is automatically displaced through the choke.
Advantages • High pressure rating — 10k psi (689 bar) — 15k psi (1,034 bar) • Maintains casing pressure — Dynamically positioning shuttle. Automatically adjusts fluid flow to regulate casing and drill-pipe pressures.
• Bottomhole Pressure (BHP) — Precise control. The precise control of the AUTOCHOKE unit can dynamically maintain BHP when controlled pressure drilling is required. — Results in less rig downtime. Maintaining the BHP at ±50 psi (3.4 bar) during well-control or drilling operations can reduce the circulation time by at least one complete circulation when removing gas from the wellbore. — Reduces fluid-loss expense. Automatic adjustment during well-control operations minimizes the occurrence of overpressuring the formation and the resultant fluid loss.
• Downstream choke-bore protection – Tungsten-carbide sleeves. Extended-wear sleeves increase in-service life and absorb the effects of abrasive downstream turbulence and protect the API ring gasket. • No-leak shut-in seals and long-life materials – Metal-to-metal and elastomerto-metal seals. Constructed of long-life components for severe service operations: tungstencarbide static trim, reversible dynamic trim, hard-faced (satellite) shuttle assembly and internal removable body sleeve. Chrome-plated internal bores for corrosion resistance.
• Frac flowback — Ideal for use as a pressure relief “valve” in frac flowback work. The hardfaced wear sleeve and the tungsten carbide downstream sleeves stand up to the highly abrasive sand flow of frac operations. • Compliance — M-I SWACO is licensed to manufacture drilling chokes and consoles under API 6A & 16C and in compliance with NACE MR-01-75. • High-capacity – High-capacity 3-in. (76-mm) choke bore. Improved flow characteristics at throttle point and through choke bore. – Self-cleaning orifice. Reduces plugging. • Preset maximum pressure capability
AUTOCHOKE control console The AUTOCHOKE console is constructed of stainless steel and is complete with drill pipe and casingpressure gauges, a hydraulic oil pump control regulator, a hydraulic oil set-point gauge, and a handoperated hydraulic backup pump. The AUTOCHOKE console is equipped with an electronic position indicator, digital pump-stroke counters with a rate meter, stop watch and clock.
How it works The unique design of the AUTOCHOKE unit features a dynamically positioning shuttle that moves back and forth on an axis housed inside of a hardfaced wear sleeve. The shuttle seats into the 3-in. (76-mm) diameter orifice in the static trim piece. Hydraulic pressure (adjusted through a set-point pressure regulator) is applied to the back side of the shuttle. This creates a pressure-balanced situation between the casing pressure of the
well and the hydraulic pressure of the choke. If the casing pressure is higher than the hydraulic pressure, the shuttle moves back and clears the orifice. If the casing pressure is lower than the hydraulic pressure, the shuttle moves forward and closes the orifice. As the shuttle moves back and forth, it regulates the flow of fluid or gas from the well through the 3-in. (76-mm) orifice.
Hydraulic set-point pressure
Static trim Shuttle sliding
Casing pressure
Fully closed Hydraulic set-point pressure
Inlet
Shuttle nut Shuttle
Dynamic trim
Casing pressure
Extended trim
Passing debris Hydraulic set-point pressure
Dynamic trim
Static trim
Static trim Long trim
Shuttle sliding
Casing pressure
Discharge
Fully opened
Specifications: AUTOCHOKE psi (bar) 10,000 (689)
Length in. (mm) 41.51 (1,054.3)
Width in. (mm) 11.50 (292.1)
Height in. (mm) 16.31 (414.3)
Weight lb (kg) 580 (263)
Temperature rating ° F (° C) –20 to 250 (–29 to 121)
Bore size in. (mm) 3 (76)
Pressure psi (bar) 10,000 (689)
15,000 (1,034)
44.26 (1,124.2)
12.50 (317.5)
19.75 (501.7)
700 (317.5)
–20 to 180 (–29 to 121)
3 (76)
15,000 (1,034)
24 (610) 35 (889)
26 (660) 28.5 (724)
55 (1,397) 57 (1,448)
655 (298) 730 (332)
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Control console 10,000 (689) 15,000 (1,034)
API API inlet flange outlet flange in. (mm) in. (mm) 3.06 (78) 3.06 (78) x 10,000 psi x 10,000 psi (689 bar) (689 bar) 31⁄16 (77.8) 31⁄16 (77.8) x 15,000 psi x 15,000 psi (1,034 bar) (1,034 bar)
The M-I SWACO SUPERCHOKE finite regulation of the opening size from full-open to full-close.
Widely used and respected for wellkill and high-pressure drilling, the M-I SWACO SUPERCHOKE product line is especially effective in well control, well testing, and well cleanup operations. These chokes are effective in H2S and abrasive-fluid applications.
Advantages • High-pressure rating — Built to handle 10,000 to 20,000 psi (689 to 1,379 bar) • 10,000 psi (689 bar) • 15,000 psi (1,034 bar) • 20,000 psi (1,379 bar) • Dependable choke-disc design — Heavy-duty, diamond-lapped tungsten-carbide discs honed to near-perfect flatness. Also feature half-moon-shaped orifices. Rotation of actuator fork allows
• Positive closure — A 17° deadband overlap beyond the full-close position ensures closure even if the plates become worn following extended exposure to abrasives-laden fluid flow. Quality of the seal is not affected by pressure drops and surges. In fact, the seal improves under pressure. • Tungsten-carbide sleeves — Increase in-service life. Extendedwear sleeves absorb the effects of abrasive downstream turbulence and protect the API ring gasket. • Versatility — Ideal for onshore and offshore applications. Controls can be operated from either primary or optional auxiliary consoles.
• Compliance — Constructed for H2S service. M-I SWACO is licensed to manufacture drilling chokes and consoles under API 6A and 16C and in compliance with NACE MR-01-75.
Control consoles M-I SWACO choke-control consoles are available to control either a single or twin SUPERCHOKE unit. These consoles are equipped with either standard or optional digital gauges. Hydraulically operated consoles are self-contained and skid-mounted for easy installation on or near the rig. A key feature of the consoles are the large, easy-to-read gauges which monitor critical drill-pipe and casing pressures.
• Three operating modes — Normal. Activation is rig-air operated. — Lost rig air. Activation is manual with hydraulic pump located on remote-control skid. — Severed hydraulic lines. Activation is manual with bar provided on indicator head.
Specifications: SUPERCHOKE psi (bar) 10,000 (689) 15,000 (1,034) 20,000 (1,378) Control consoles Single Dual
Length in. (mm) 35.7 (906.8) 43.3 (1,099.8) 43.4 (1,102.4)
Width in. (mm) 21.6 (548.6) 21.6 (548.6) 24.3 (617.2)
Height in. (mm) 11.5 (292.1) 11.5 (292.1) 13.2 (335.3)
Weight lb (kg) 441 (200) 600 (272) 650 (295)
55 (1,397) 55 (1,397)
27 (686) 27 (686)
65 (1,651) 69 (1,753)
588 (267) 690 (313)
Temperature rating ° F (° C) –20 to 250 (–29 to 121) –20 to 250 (–29 to 121) –20 to 250 (–29 to 121)
Pressure psi (bar) 10,000 (689) 15,000 (1,034) 20,000 (1,378)
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The M-I SWACO ESUPERCHOKE • High torque The ESUPERCHOKE system is capable of more than 19,400 in.-lb (2,191.9 Nm) torque. It can sever a ∑-in. (12.7-mm) alloy steel rod and still achieve the full-close position.
• Small footprint The electronic console’s quiet and space-saving design allows the console to be located in the driller’s cabin.
• Variable-speed drive The operator can control the speed at which the choke is opened or closed, giving the operator precise choke-positioning adjustment during critical well-control situations.
The ESUPERCHOKE unit is the M-I SWACO standard SUPERCHOKE unit; it incorporates an electric motor actuator and an electronic console.
Advantages • High-pressure rating — Built to handle 10,000 and 15,000 psi (689 to 1,034 bar) • Cold weather The electric motor and electronic console replace the air-over-hydraulic console and improve reliability in cold-weather environments.
• Reduced cabling requirements The ESUPERCHOKE unit requires only one communication cable between the remote and local console. • Three modes of operation — Remote at driller’s console — Local at the choke manifold — Manual at the choke itself, using the hand-wheel
• Faster open/close speeds Eight seconds from full-open to full-close. This time exceeds that of a hydraulically actuated choke in cold-weather environments. • Enhanced communication capability The ESUPERCHOKE system records data via Ethernet to external dataacquisition systems, greatly enhancing the ability to evaluate frac flowbacks, well-control problems, and leak-off tests in real time.
Specifications: ESUPERCHOKE psi (bar) 10,000 (689) 15,000 (1,034) Control consoles Single Dual
Length in. (mm) 38.5 (978) 47.38 (1,203)
Width in. (mm) 14.38 (365) 14.75 (375)
Height in. (mm) 21.38 (543) 25 (635)
Weight lb (kg) 525 (238) 775 (352)
18 (457) 18 (457)
10 (254) 10 (254)
14 (356) 14 (356)
60 (27) 60 (27)
Temperature rating ° F (° C) –20 to 250 (–29 to 121) –20 to 250 (–29 to 121)
Pressure psi (bar) 10,000 (689) 15,000 (1,034)
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P.O. Box 42842 Houston, Texas 77242-2842 www.miswaco.com E-mail:
[email protected] Technology Centers: HOUSTON, TEXAS Tel: 281·561·1300 · Fax: 281·561·1441 STAVANGER, NORWAY Tel: 47·51·577300 · Fax: 47·51·576503 Technical Service Centers: NISKU, ALBERTA, CANADA Tel: 780·955·3388 · Fax: 780·955·2064 ABERDEEN, SCOTLAND Tel: 44·1224·285500 · Fax: 44·1224·890904 BERGEN, NORWAY Tel: 47·55·173850 · Fax: 47·55·173851 DUBAI, U.A.E. Tel: 971·4·8830644 · Fax: 971·4·8837197 PERTH, AUSTRALIA Tel: 61·8·94402900 · Fax: 61·8·93251897 This information is supplied solely for informational purposes and M-I SWACO makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.
©2008 M-I L.L.C. All rights reserved. *Mark of M-I L.L.C. DBR.0301.0808.R1 (E) 2.5M Litho in U.S.A.
