Inside Bop

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INSIDE BOP

34. INSIDE BOP 34.1 FUNCTION There are several pieces of equipment in addition to the primary blowout prevention equipmentthat are sometimes necessary to control a kick. The equipment which furnishes closure inside the drill string is called an "INSIDE BLOWOUTPREVENTER". They are installed on the top or inside the BHA with the purpose to provide a means of closing thestring for well control or even to permit to repair/replace some tools. Inside BOP

- Manufacture specificationsInside BOP are manufactured according to API 6A (and API 7 for the connections)The relevant ISO standard is the 10423 Spec. 34.2 TYPES OF INSIDE BOP DROP-IN VALVE FLOAT VALVE GRAY FLOAT VALVE SAFETY VALVES DROP-IN VALVE

- Components: Landing Sub installedin the drilling string; Check valve: pumpdown or drop-in typedropped inside the stringand latches inside thelanding sub used forstripping or before to cutwith shear rams. Retrieving Tools areused if the check valve iswireline retrievable. Main manufacturer are: - HYDRIL - SMF

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INSIDE BOP

- HYDRIL DROP-IN VALVE Checkguard

Developed in the 1930s (market pioneer), Installed in the lower end of the drill string above the bit to prevent backflow - Configurations and API specification5 configurations #19 #27 #35 #43 #48

1 3/16" I.D. thru bore 1 11/16" I.D. thru bore 2 3/16" I.D. thru bore 2 11/16" I.D. thru bore 3" I.D. thru bore

Conforms to API, specification 7 - Working Principles

- Installing Checkguard valve Checkguard valve is installed as needed. Remaining top side, it is not subject to constant wear asmany downhole valves are. Abrasive wear on typical drill pipe float valves results in frequentreplacement and can prevent closure. Only the Checkguard landing sub is installed as the drill string is run. When control is needed, the valve is pumped down the drill string where it latches automatically inthe landing sub. - Pumping down Checkguard valve Downward flow ar\eas are maximized for high flow capacity and long life.The check valve sits in the landing sub in the replaceable landing sleeve, latching positively. The sleeve has recessed areas into which the check valve packer seals. - Close Checkguard valve Checkguard valve seals pressure up to 15,000 psi.Yet it is lightweight and easily handled.The ball closes against upward pressure. - Retrieving Checkguard valve It is wire-line retrievable. Wire line retrievable, eliminating the need to trip the drilling string.Retrieval can also be accomplished after tripping out the drill string. In this illustration, the retrieving tool unlatches the check valve and lifts it to the surface. FLOAT VALVE Float valve may be considered an INSIDE BOP. Basically a flapper or poppet type check valve that is installed in the bit sub to prevent back flowduring connections. It allows circulation only in one direction. - FVR Float Valve Float Valve Plain Flapper and Vented Flapper

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INSIDE BOP

GRAY FLOAT VALVE Always on the rig floor ready to be installed, thehold-open type has the back pressure valvepinned in an open position so that the valve canbe installed when mud is flowing. The pin is removed after installation to allowclosure.

SAFETY VALVES Kelly Cock Rigs with TOP DRIVE Actuator Types - Kelly Cock The kelly cock is a safety valve placedabove the kelly (UPPER KELLY COCK) and below the kelly (LOWER KELLYCOCK). Its basic purpose is to provide a means of closing the string should the swivel, hose, or stand-pipe leak or rupture under conditions of a threatened blowout. This arrangement permits these items to be repaired or replaced. A special wrench to operate the kelly cock is required and must be taken in a readily a ccessible place known to every crew member.

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INSIDE BOP

- Rigs with TOP DRIVE Rigs with TOP DRIVE have two valves: A manual one on bottom part (lower kellycock) and one on the top remotely operated (upper kelly cock).

- Actuator Types

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INSIDE BOP

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