Product Details
Company Profile

Annular BOP Hydril GK type 11“-5000psi Forging BOP

Hydril GK Annular Blowout Preventer (BOP) Overview

The Hydril GK Annular BOP is a versatile pressure control device designed for surface installations, offshore platforms, and subsea applications, boasting a proven track record of reliable performance in the petroleum industry. It delivers safe and efficient well control with tailored features and intuitive operation.

Key Features

Minimal moving parts: Only two core components (piston and packing unit) reduce wear points, minimizing maintenance needs and downtime.
Stable long-piston design: A length-to-diameter ratio approaching 1 eliminates cocking and binding during operations with off-center pipe or uneven sand/cutting accumulations.
Conical bowl piston design: Acts as a sealing surface against the rubber packing unit, avoiding metal-to-metal wear and extending service life.
Field-replaceable wear plate: Serves as an upper non-sealing wear surface for the packing unit, enabling fast and cost-effective on-site repairs.
Dual head options: Screwed head design ensures secure body-head connection with no loose parts; latched head (available for 13-5/8"-5000 psi and larger models) allows quick access to packing units and seals.
Durable sealing system: Large pressure-energized seals dynamically seal piston chambers, ensuring long seal life and low maintenance.
Rigorous testing and compliance: Operating chambers are tested to full working pressure; meets NACE MR-01-75 standards for resistance to sulfide stress cracking.
Flexible packing unit options: Two rubber compound choices (natural rubber and nitrile rubber) adapt to diverse drilling conditions.

Operation Principles

Basic actuation: Requires both opening and closing hydraulic pressure. Seal-off is achieved by applying hydraulic pressure to the closing chamber, which raises the piston and forces the packing unit into sealing engagement with the drill string or open bore.
Well pressure assistance: After initial seal-off, well pressure helps maintain the seal (excluding GK 7-1/16"-15,000 and 20,000 psi models, which require sustained closing pressure).
Stripping operations: Drill pipe can be rotated and tool joints stripped through the closed packing unit while maintaining a seal. Optimal packing unit life is achieved by setting the closing chamber pressure to allow slight drilling fluid leakage for lubrication.
Control system compatibility: Works with any standard closing unit equipped with a separate pressure regulator valve for the annular BOP and sufficient accumulator volume.
Supplementary components: If the pressure regulator valve responds slowly, an accumulator (surge absorber) precharged to 50% of the required closing pressure should be installed in the closing chamber control line. For subsea operations, an accumulator in the opening chamber line may be added to prevent pressure fluctuations

Item	Annular Blowout Preventer (BOP)
Model	FHZ28-35	FHZ28-35/70
Weight (kg)	4000	4110
Height (H, mm)	1240	1290
Center of Gravity Height (h, mm)	703	727
Top Connection Type	11"-5000 psi 6B R54	11"-5000 psi 6B R54
Bottom Connection Type	11"-5000 psi 6B R54	11"-10000 psi 6BX BX158
Bore Size	279.4 mm (11″)	279.4 mm (11″)
Hydrostatic Test Pressure	51.8 MPa (75,000 psi)	51.8 MPa (75,000 psi)
Rated Working Pressure	34.5 MPa (5,000 psi)	34.5 MPa (5,000 psi)
Hydraulic Control System Strength Working Pressure	31.4 MPa (4,500 psi)	31.4 MPa (4,500 psi)
Hydraulic Control Rated Working Pressure	20.7 MPa (3,000 psi)	20.7 MPa (3,000 psi)
Recommended Hydraulic Operating Pressure	8.3-10.4 MPa (1,200～1,500 psi)	8.3-10.4 MPa (1,200～1,500 psi)
Packing Unit Sealing Range	0~279.4 mm (0~11")	0~279.4 mm (0~11")
Oil Volume for One Packing Unit Opening	31 L	31 L
Oil Volume for One Packing Unit Closing	37.5 L	37.5 L
Hydraulic Control Line Connection Thread	NPT 1"	NPT 1"
Temperature Class	T-20/250 (Subject to change per specific contract)	T-20/250 (Subject to change per specific contract)

Notes:

The BOP is designed and manufactured in accordance with API Spec 16A.
All internal components in contact with well fluids are resistant to sulfide stress corrosion, complying with NACE MR 0175/ISO 15156 (all parts).

Product Tags:

Hydril GK annular BOP 11-inch

5000psi forged annular BOP

Hydril type annular blowout preventer

Annular BOP Hydril GK type 11“-5000psi Forging BOP

Send your message to this supplier


*From:	Your email address is incorrect!
*To:	Hebei Constellation Energy Technology Co., Ltd.
*Subject:	Subject is empty!
*Message:	For the best results, we recommend including the following details: -Self introduction -Required specifications -Inquire about price/MOQ Characters Remaining: (0/3000) Please enter 20 to 3000 characters to contact this supplier!

Categories	Hydril Annular BOP
Brand Name:	RZY
Certification:	API 16A & API 6A
MOQ:	1
Price:	Price negotiation
Payment Terms:	T/T
Supply Ability:	20 units delivered within two months
Delivery Time:	60~75 days
Packaging Details:	Fumigation-free wooden cases or iron cases packaging
Item:	Annular BOP
Model:	Hydril GK Type
Bore:	279.4 mm (11″)
Working Pressrue:	34.5 MPa (5,000psi)
Overall Dimensions:	1086.5mm×1086.5mm×1240
Weight:	4000kg