When there are no drilling tools in the well, it can completely seal the annular space formed by square drill pipe,

coring tool, cable and steel wire in the process of drilling, coring and logging, and can pass through the annular

space formed by the wellbore with the use of pressure reducing and pressure regulating valve. Drilling tool can

be forcibly lifted down by the drill pipe .

Bop Rubber Core and Assembly 

1. Scope of application: rubber cores for sealing of BOPs in oil prospecting, well drilling, oil test, well repair, oil and gas wells and well control at -26℃~149℃.

2. Applicable standards: API Spec 16A and SY/T5053.1-2002 standard. 

3. Sizes and models of rubber pipe rams: 18-14, 18-21, 18-35, 18-70, 28-35, 28-70, 35-35, 35-70, 54-14. 

4. Sizes and models of Spheric rubber core: 18-35, 28-35, 35-35, 54-14  

5. Characteristic

In the structure, it is divided into annular blowout preventer with spherical plastic core, annular blowout preventer with cone-shaped plastic core, and blowout preventer with tube-shaped plastic core. Annular BOP top cap and housing are connected by bolts or claw blocks. 

Blowout preventer with spherical plastic core and dust-proof ring. 

Performance characteristics: reasonable structure, easy operation, long life of plastic core, adapt to a wide range, capable to seal pipe string with nominal paths from 0~DN in ans shapes, better performance by combining with ran blowout preventer in the use. 

Working Principle:

When wells must be sealed in case of kicks high pressure(10.5Mpa) oil from control systems enters into close-cavity under piston from housing oil outlet, to promote plastic core moving upward along ball surface, so that bearing tendons move closer to each other to move the rubber between them to the center of wellhead so as to seal drilling tools or fully seal wellhead. In opening, hydraulic pressure oil enters into open-cavity above piston from housing oil inlet, to push piston moving downwards, so that plastic will reset with its own elasticity, wellhead will be open. 

We ,Hebei Baoshi Special Flexible Rubber Chemical Industry Co., LTD,specialize in the field for more than 10 years, with the strength of RTP pipe, rubber hose, orging-casting integrally-formed union drilling hoses, high-pressure double-hook self-locking flame retardant hoses, oil/water self-inflatable packers (the above products are patent products), hydraulic expandable packers, wire spirally-wound hoses, high and low pressure wire braided hoses, flexible reinforced composite pipes, metal hoses, suction and discharge clay hoses, ripple compensators, high and low pressure unions, joint, packers, packer rubber, mud pump piston, seal products, etc.; the company also produces relevant matching products, various fittings, clamps, rubber products, polyurethane products, silicon and fluoro rubber products, etc. Our company has been managed strictly according to the demands of ISO9001:2008 and have passed API Q1 quality management system of American Petroleum Institute, the certifications of ISO14001 environmental control system and OHSAS 18001 vocational health cotrol system.