Shaffer type annular blowout preventer BOP

Model: Well control equipment
Place of Origin: Shaanxi,China (Mainland)
Type: Others
Certification: Others
Brand Name: Kingwell
Machine Type: Drilling Equipment
Certification: API
Use: Well Drilling
Performance level: PR1, PR2
Specification Level: PSL1, PSL2, PSL3
Top connection: Studed or flanged
Bottom connection: Studed or flanged
Material: Iron


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Product Description

Payment & Shipping Terms Supply Capacity
Unit Price:10000.0 USDProduction Capacity:30 sets per month
Trade Term:FOB,CFR,CIF,DDP,DAP,CIP,CPT,FCA,EXWPacking:Standard export...
Payment Terms:L/C, T/T, WUDelivery Date:Within 30 days
Min. Order:1 Set/Sets
Means of Transport:Ocean, Air, Land

Annular Blowout preventer 

A blowout preventer is a large, specialized valve or similar mechanical device, usually installed redundantly in stacks, used to seal, control and monitor oil and gas wells. 

In addition to controlling the downhole (occurring in the drilled hole) pressure and the flow of oil and gas, blowout preventers are intended to prevent tubing

 (e.g. drill pipe and well casing), tools and drilling fluid from being blown out of the wellbore (also known as bore hole, the hole leading to the reservoir) 

when a blowout threatens. Blowout preventers are critical to the safety of crew, rig (the equipment system used to drill a wellbore) and environment, and to 

the monitoring and maintenance of well integrity; thus blowout preventers are intended to provide fail-safety to the systems that include them. 

Most blowout preventer (BOP) stacks contain at least one annular BOP at the top of the BOP stack, and one or more ram-type preventers below.

Annular BOP is an important part of well-control equipments. It mainly applies to control wellhead pressure during drilling workover operations and formation testing etc to prevent well blowout 

effectively and realize safe construction. Annular BOP shall be equipped with hydraulic control system. It is usually used with ram BOP and also independently.


Annular BOP consists of the body, upper housing, dust-proof  ring, piston and packing elemant etc. 

It can seal all size of kelly, drill pipes, drill pipes subs, 

drill collar, casing strings and cables in various shapes. 




When there is no drilling tool in hole, it can seal the wellhead completely.

It can seal any size of annular space with a kind of rubber if there is a drilling tool, tubing or casing in hole.

When the well blowout and overflow 

happens during drilling, coring or well logging, it can seal the annular spaces between Kelly, coring tools, cable, wireline and wellbore.

Under the control of the hydraulic control system which is equipped with a depressuring pressure regulating valve or a cushion accumulator, it can force 

stripping with 18°tool joint.




Annular BOP using the spherical packing element

Annular BOP using the conical packing element

Annular BOP using the Combined packing element




Bore Size: 7 1/16~21 1/4 3/4(180mm~540mm)

Working Pressure: 14~105Mpa(2000~15000Psi)

Company Introduction

XI'AN KINGWELL OILFIELD MACHINERY Co., Ltd. (KINGWELL) is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provides complete solutions.

With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, drilling tools, DST tools and Solid control products.

KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation; our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices. Our products have been exported to Europe, American and Middle East.

Category: BOP part

Related Category: BOP part