Precision Connections BK-FX Semi Premium Connection Buttress - - PowerPoint PPT Presentation

Semi Premium Connection Buttress Compatible Full Size Coupling with an Integral Shoulder Designed Primarily for High Torque Frac Strings

Precision Connections BK-FX

BK-FX Features

• Higher Torque and Improved Sealing The BK-FX

uses a thicker coupling with a larger OD to increase strength and torque resistance. The thicker coupling can take higher frac pressures and supports thicker wall pipe with 100% matched pipe strength. It also provides more strength when utilizing high collapse or enhanced burst strength pipe.

• Buttress Compatible for cost savings on hangers,

float shoes, float collars, crossovers and custom tools.

• Better Buttress Sealing Modified buttress thread

for tighter thread sealing and pin nose seal stabilization.

• API Thread Tolerance – Verified

fit of several major insert manufacturers.

• BK Thread Tolerance – Minimizes

thread gap for better thread

• sealing. Uses a Custom Premium

Insert.

Bad Good

Better Buttress Pipe Threads for Sealing and Easy Makeup

• Tighter tolerances on lead, taper, ovality and pitch diameter.
• More pin nose area from OD and ID bevel design.
• Aggressive de-burr for trouble free make-ups.

Black Crested Threads provide a leak path. Shiny threads seal.

Coupling Shoulder Provides a positive torque stop

and improves coupling strength. Easier to make up than semi premium with less chance of a bad make up. Isolates stresses from the mill end and field end. The BK-FX will have lower coupling stresses if the connection is inadvertently over-torqued.

• Fast and Consistent Shoulder Torque Installation Better

threading techniques and coupling coatings allow for a quick low cost installation. The BK-FX will run quickly, reducing the run time per well.

• Strength Pin Nose to Coupling contact for high torque resistance,

higher pressure ratings, higher bending loads and higher structural compressive loading . Smooth Premium Bore with no J-Area to get hung up on.

Buttress Pressure

Standard Buttress allows the internal pressure to react against the thin walled coupling.

Strength A low hoop stress design reduces the chance

• f coupling splits and leaks from high frac pressures.

Stress is kept below material yield strength.

Installed Stress Frac Stress

The coupling will return to its

• riginal shape after the frac

without high residual stresses and deformations that accelerate corrosion and crack growth.

High RPM Fatigue Resistance from Low Stress Runout Threads The BK uses the field proven buttress

thread with low stress runout threads to extend the time it can be rotated through a dogleg at high RPM.

Torque The BK-FX deforms less than a pin nose to pin nose

connections when over torqued. Splits in full sized over-torqued couplings are nearly unheard of.

Torque Graph for 5.5” 20# P110 BK-FX

• The pin tooth crest can ride on top of the box tooth crest

past the coupling center; the cross threading leads to a crack initiated washout. Major Competitors and API Couplings can cross thread.

• Single largest cause of failure of pin nose to pin nose

semi premium connections.

Reliable Materials Unlike first generation drilling with

casing connections, the BK-FX addresses the problems that have caused couplings to fail. Low hoop stress and controlled hardness couplings are utilized to reduce the chance of stress induced corrosion and embrittlement.

• Above 80% Yield Strength
• Bad Make-up & cross threading
• Frac pressure
• Manufacturing tolerance stacking
• Clean Steel Practices
• Brittleness
• Chemistry
• Hydrogen
• Salt Water
• Acid
• H2S
• Exposure Time
• Temperature

Elements of material failures

Brittle High Stress Couplings =