Drilling

Top Hole

Challenge

A high risk of stuck-pipe incidents arise during top hole drilling due to the notoriously unstable nature of the formations including factors such as:

  • geologically young
  • readily hydrated
  • low compressive strength
  • presence of rocks and boulders
  • flowing shallow sands

Risk

Typically, jars are omitted from BHA’s leading to increased risk of failure to recover from a stuck-pipe incident. Traditional jars are omitted because of:

  • insufficient depth to accommodate jars, accelerators and HWDP
  • severe shock damaging the rig, top drive and derrick
  • injury to personnel from dropped/falling objects
  • insufficient pipe stretch for efficient jarring
  • rapid moving jar components causing destabilising mechanical shock, and swab and surge leading to further hole collapse

Solution

HydroVolve HAMMER in the BHA as a superior alternative to a drilling jar:

  • enables INSTANT high rate vibro-impact delivery
  • enables RAPID solids mobilisation
  • enables MASSIVE friction reduction to facilitate rapid pipe recovery
  • allows continuous rotation of the drillstring to aid recovery
  • prevents need for accelerators
  • prevents need for HWDP
  • prevents shock to rig and derrick
  • prevents shock to the unstable hole

Conductor Deployment

Challenge

Barriers to speedy conductor deployment are many-fold, with poor hole condition being amongst the most common and leading to:

  • no ability to increase deployment effort
  • no scope for added weight
  • no viable down jarring capability

Risk

Failure to quickly deploy conductor:

  • leads to hole instability and possible collapse
  • may prevent conductor being deployed to TD and stuck off-bottom
  • necessity for unplanned clean up trips
  • may lead to re-spudding or loss of slot

Solution

Few tools have traditionally been available to overcome these challenges, but now PolyVolve HAMMER in the BHA provides controlled down acting vibro-impact which:

  • enables massive friction reduction to facilitate rapid conductor deployment
  • mobilises and displaces settled solids resulting from hole instability
  • ensures speedy, accurate and controlled conductor placement

Intermediate Sections

Challenge

Drilling of intermediate sections is commonly frustrated by stuck-pipe problems arising from:

  • directional drilling challenges such as washouts and key seating in interbedded formations
  • unpredictable evaporites such as dolomites, salts and halites significantly increasing the risk of stuck-pipe incidents
  • collapsing and sloughing shales with ever tighter mud-weight drilling margins

Doglegs and deviation lead to high torque and drag resulting in reduced drilling performance.

Hard formations can impede progress with poor ROP and high wear on bits.

Risk

The two most prevalent and commonly understood sticking mechanism in intermediate sections are of course:

  • mechanical sticking
  • differential sticking

High torque and drag can lead to casing wear and significantly reduced ROP.

Hard formation drilling results in increased tripping to replace worn bits and significantly reduced ROP.

Solution

Inclusion of the HydroVolve HAMMER in the drill string significantly decreases the chance of becoming stuck and increases the likelihood of recovering from stuck-pipe incidents due to its:

  • shorter, lighter BHAs with less contact area
  • instant, rapid and continuous vibro-impacting extraction action
  • rotational decoupling of the drillstring from the stuck pipe breaking the static friction of the string in the hole providing much improved load transfer
  • open circulation path to annulus and aiding hole cleaning and fluid management

Placement of MonoVolve REDUCER’s across build sections will significantly reduce the torque and drag, enhancing drillstring and BHA resilience, saving casing wear and increasing drilling performance and importantly, if called into action, HydroVolve HAMMER performance.

Extended Reach Drilling (ERD)

Challenge

ERD wells present the drilling team with significant challenges including:

  • high torque
  • high drag
  • managing buckling versus weight on bit (WOB)
  • balancing hole cleaning flow rate versus equivalent circulating density (ECD)

Risk

Risks arising whilst drilling include:

  • insufficient WOB to achieve optimal rate of penetration (ROP)
  • helical buckling leading to excessive torque and drag
  • stuck pipe arising from cuttings bed pile-up due to long highly deviated/horizontal sections and low flow
  • stuck-pipe from differential sticking
  • casing wear
  • high friction/drag arising from pipe lying on low side
  • poor ROP due to low WOB

Solution

HydroVolve HAMMER in the drillstring will:

  • significantly reduce the length, weight and contact area of the BHA
  • improve WOB
  • improve operational hydraulics
  • enhance drilling performance
  • reduce risk of differential sticking

HydroVolve HAMMER significantly increases the likelihood of recovering from stuck-pipe incidents due to its:

  • instant, rapid and continuous vibro-impacting action
  • rotational decoupling of the drillstring from the stuck pipe breaking the static friction of the string in the hole
  • open circulation path to annulus and aiding hole cleaning and fluid management

Placement of MonoVolve REDUCER’s across build sections that are in tension and also in highly deviated or horizontal sections can significantly reduce the torque and drag, enhance drillstring and BHA resilience, saving casing wear and increasing drilling performance.