51704804 Drilling Chokes

Drilling Chokes

Protect your well with dependable, secure pressure control

ENVIRONMENT

Features and Benefits

M-I SWACO* chokes are precision-engineered for accurate well control under harsh, demanding conditions.

10k SUPERCHOKE*, 15k SUPERCHOKE, 20k SUPERCHOKE,

10k ESUPERCHOKE*, 15k ESUPERCHOKE

• Designed with half-moon-shaped orifices that allow precise opening and closure

• Positive closure through overlap beyond the full-close position. Disc-to-disc design is not affected by pressure drops or surges.

• Tungsten-carbide wear sleeves for increased in-service life, absorbing the effects of abrasive downstream turbulence

• Ideal for onshore and offshore applications • Can be controlled from

either primary or optional auxiliary consoles

10k AUTOCHOKE*, 15k AUTOCHOKE

• Automatically adjusts fluid flow to regulate casing pressure • Easy, predictable

pressure 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

When the pressure is on, our SUPERCHOKEand AUTOCHOKE tech-nologies give you precise control, providing critical pressure manage-ment 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 tech nical performance into choke development, providing opera-tors with reliable, responsive control options to keep pressure in its place.

Reliable, responsive

performance under pressure

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Land or offshore conventional drilling; the special demands of Underbalanced Drilling (UBD), Coiled-Tubing 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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During controlled-pressure drilling, management of formation pressures can be critical. An uncontrolled pres-sure influx can result in dangerous kicks and well-control problems.

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M-I SWACO solutions address all your well-control needs. SUPERCHOKEunits for shutting in the well, determining circulating pressure, breaking circula-tion, maintaining constant casing and drill-pipe pressure; AUTOCHOKEunits for breaking circulation and main-taining constant casing, drill pipe and set-point pressure; ESUPERCHOKE units for automated control.

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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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In addition to keeping your well free of kicks and blowouts, maximum con-trol over fluid loss and reduced water requirements help to minimize a project’s environmental footprint.

The M-I SWACO AUTOCHOKEunit is ideal for use as a pressure-relief “valve” for frac flowback work.

The M-I SWACO AUTOCHOKEunit pro-vides automatic, precise pressure con-trol. It is the best choke technology available today for UBD and MPD applications. The AUTOCHOKEunit regulates casing pressure automati-cally 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 AUTOCHOKEunit due to its ability to maintain casing pressure. As drill pipe is lowered into the hole, an equal volume of fluid under pres-sure 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 tain 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 mini-mizes the occurrence of over-pressuring the formation and the resultant fluid loss. • Frac flowback

— Ideal for use as a pressure relief “valve” in frac flowback work. The hardfaced wear sleeve and the tungsten carbide down-stream sleeves stand up to the highly abrasive sand flow of frac operations.

• Compliance

— M-I SWACO is licensed to manu-facture drilling chokes and con-soles under API 6A & 16C and in compliance with NACE MR-01-75. • High-capacity

– High-capacity 3-in. (76-mm) choke bore. Improved flow char -acteristics at throttle point and through choke bore.

– Self-cleaning orifice. Reduces plugging. • Preset maximum

pressure capability

• 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 elastomer-to-metal seals. Constructed of long-life components for severe service operations: tungsten-carbide static trim, reversible dynamic trim, hard-faced (satellite) shuttle assembly and internal removable body sleeve. Chrome-plated internal bores for corrosion resistance.

A

UTO

C

HOKE

control console

The AUTOCHOKEconsole is con-structed of stainless steel and is complete with drill pipe and casing-pressure gauges, a hydraulic oil pump control regulator, a hydraulic oil set-point gauge, and a operated hydraulic backup pump. The AUTOCHOKEconsole is equipped with an electronic position indicator, digital pump-stroke counters with a rate meter, stop watch and clock.

Temperature API API

Length Width Height Weight rating Bore size Pressure inlet flange outlet flange

psi (bar) in. (mm) in. (mm) in. (mm) lb (kg) ° F (° C) in. (mm) psi (bar) in. (mm) in. (mm)

10,000 41.51 11.50 16.31 580 –20 to 250 3 10,000 3.06 (78) 3.06 (78) (689) (1,054.3) (292.1) (414.3) (263) (–29 to 121) (76) (689) x 10,000 psi x 10,000 psi (689 bar) (689 bar) 15,000 44.26 12.50 19.75 700 –20 to 180 3 15,000 31_⁄ 16(77.8) 31⁄16(77.8) (1,034) (1,124.2) (317.5) (501.7) (317.5) (–29 to 121) (76) (1,034) x 15,000 psi x 15,000 psi (1,034 bar) (1,034 bar) Control console 10,000 24 26 55 655

(689) (610) (660) (1,397) (298) N/A N/A N/A N/A N/A

15,000 35 28.5 57 730

(1,034) (889) (724) (1,448) (332) N/A N/A N/A N/A N/A

Specifications: A

C

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 situa-tion 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.

Shuttle

Shuttle nut Inlet

Dynamic trim Extended trim Discharge Long trim Static trim Fully closed Hydraulic set-point pressure Shuttle sliding Casing pressure Hydraulic set-point pressure Casing pressure Static trim Hydraulic set-point pressure Shuttle sliding Casing pressure Static trim Dynamic trim Passing debris Fully opened

Widely used and respected for well-kill and high-pressure drilling, the M-I SWACO SUPERCHOKEproduct line is especially effective in well control, well testing, and well cleanup opera-tions. These chokes are effective in H2S and abrasive-fluid applications.

Advantages

— Heavy-duty, diamond-lapped tungsten-carbide discs honed to near-perfect flatness. Also fea-ture half-moon-shaped orifices. Rotation of actuator fork allows

finite regulation of the opening size from full-open to full-close. • Positive closure

— A 17° deadband overlap beyond the full-close position ensures closure even if the plates become worn following extended expo-sure 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. Extended-wear 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. • 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.

• 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 sin-gle or twin SUPERCHOKEunit. 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.

The M-I SWACO S

UPER

C

HOKE

Temperature

Length Width Height Weight rating Pressure

psi (bar) in. (mm) in. (mm) in. (mm) lb (kg) ° F (° C) psi (bar)

10,000 35.7 21.6 11.5 441 –20 to 250 10,000 (689) (906.8) (548.6) (292.1) (200) (–29 to 121) (689) 15,000 43.3 21.6 11.5 600 –20 to 250 15,000 (1,034) (1,099.8) (548.6) (292.1) (272) (–29 to 121) (1,034) 20,000 43.4 24.3 13.2 650 –20 to 250 20,000 (1,378) (1,102.4) (617.2) (335.3) (295) (–29 to 121) (1,378) Control consoles Single 55 27 65 588 (1,397) (686) (1,651) (267) N/A N/A Dual 55 27 69 690 (1,397) (686) (1,753) (313) N/A N/A

The ESUPERCHOKEunit 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 con-sole replace the air-over-hydraulic console and improve reliability in cold-weather environments.

• Small footprint

The electronic console’s quiet and space-saving design allows the console to be located in the driller’s cabin.

• Reduced cabling requirements The ESUPERCHOKEunit 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

• High torque

The ESUPERCHOKEsystem is ble 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. • Variable-speed drive

The operator can control the speed at which the choke is opened or closed, giving the oper -ator precise choke-positioning adjustment during critical well-control situations. • 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 ESUPERCHOKEsystem records data via Ethernet to external data-acquisition systems, greatly enhanc-ing the ability to evaluate frac flowbacks, well-control problems, and leak-off tests in real time.

The M-I SWACO

E

S

UPER

C

HOKE

Temperature

Length Width Height Weight rating Pressure

psi (bar) in. (mm) in. (mm) in. (mm) lb (kg) ° F (° C) psi (bar)

10,000 38.5 14.38 21.38 525 –20 to 250 10,000 (689) (978) (365) (543) (238) (–29 to 121) (689) 15,000 47.38 14.75 25 775 –20 to 250 15,000 (1,034) (1,203) (375) (635) (352) (–29 to 121) (1,034) Control consoles Single 18 10 14 60 (457) (254) (356) (27) N/A N/A Dual 18 10 14 60 (457) (254) (356) (27) N/A N/A

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

©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.

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.