BK-HT Semi Premium Connection Precision Connections BK-HT Semi - - PowerPoint PPT Presentation

BK-HT Semi Premium Connection

Semi Premium Connection Designed Primarily for:

• High Torque Frac Strings
• High Collapse P110 and L80
• 125 ksi min yield P110 grades
• Extreme torque & tension
• Pipe with thicker walls like 5.5”

26#. Not covered by API.

Precision Connections BK-HT

BK-HT Features

• Higher Torque and Improved Sealing

– The BK-HT 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. – Provides more strength when utilizing high collapse or enhanced burst strength pipe.

• Third Generation BK-HT was designed for Frac

Strings unlike first generation designs which were primarily for drilling with casing in shallow vertical wells.

BK-HT Features

Higher Torque & Lower Drag A thicker coupling is stiffer and will stretch less axially and radially as the pin noses react to torque. The OD is beveled to reduce drag in horizontal wells. Offered on 4.5”, 5”, 5.5” and 7” pipe. 7” Pipe always comes with BK-HT.

BK-HT Features

• Buttress Compatible for cost savings on hangers, float shoes,

float collars, crossovers and custom tools. BK-HT , BK and BK- FX are interchangeable.

BK-HT & BK Profile

The triangle stamp position is identical to API for easy make up verification.

• Better Buttress Sealing Uses a modified buttress

thread for tighter thread sealing and pin nose seal stabilization. The thicker coupling is ideal for high collapse or enhanced burst strength pipe. The BK-HT allows the use of corrosion resistant control yield couplings with the higher yield pipe.

• 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.
• More perfect threads are engaged in the coupling. Up to

four more than some competitors.

• Aggressive de-burr for trouble free make-ups.

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

Advanced Relief Groove ensures more threads are

engaged for maximum sealing. The thicker midpoint cross sectional area provides additional coupling strength.

BK-HT Relief Groove First Generation Relief Groove

Dark areas indicate unengaged thread regions

Torque The BK-HT has better high torque running

characteristics which will keep the coupling intact past pin nose

• yield. The strength comes from more engaged threads with a

thicker center.

5.5” 17# P110 BK-HT Yield Torque Testing

• Fast and Consistent Shoulder Torque Installation Better threading

techniques and coupling coatings allow for a quick low cost

• installation. The BK-HT will run quickly, reducing the run time per

well.

• Strength Pin Nose to Pin Nose 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.

BK Buttress Pressure

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.

Self Centering Anti Rotation Prevents the coupling

from turning past center during make up with a thread

• interlock. US Patent # 9,261,207 & 9,261,208.

Thread Interlock Anti-rotation

The pin tooth will lock up past center as it is forced into a groove that is a mirror

• image. The connection acts like a

shouldered coupling.

Phase locked grooves

The grooves (Coupling Thread Roots) are cut in phase / lead so they meet in the middle

• f the coupling. Eliminates the possibility

that the pin thread can cross thread into the

• ther side of the coupling under high

torque.

The BK Anti-Rotation Mechanism Prevents Cross threading.

• When over-torqued the BK-HT provides an extra level of protection that

is not provided by any other semi premium.

• The threads are cut in lead with each other on both sides of the

coupling so they can’t cross thread.

• The benefit is huge on thin wall pipe where it reduces no drift
• situations. Thin pin noses are easily bent inward when cross threaded.

• 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-HT addresses the problems that have caused couplings to fail. Low hoop stress and controlled yield and 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 =