Dk well control

DSV TRAINING PRESENTATION II MILLING AND WELL CONTROL

Presentation title - Place and Country - Date Month Day Year 2

Kicks occur when formation pressures exceed mud hydrostatic pressure, formation fluids enter well bore. Uncontrolled influx of formation fluids leads to blow out

Causes of kicks

• Failure to keep the hole full• Insufficient mud density• Swabbing during tripping• Lost circulation

Detecting kicks

• Pit volume gain• Increased flow on return line• Drilling break• Incorrect fill-up on trips• Decrease in circulating pressure• Shows of oil, gas or salt water• increase in hook load

WELL CONTROL AND MONITORING

KICKS AND BLOW OUT


Annular preventer• 13 5/8” X 5000 shaffer Annular Preventer• Uses a ring of synthetic rubber to close around

any pipe size• Utilise upward well pressure to remain closed• Allows stripping• Operated hydraulically

Pipe rams• Close around specific pipe sizes

Blind rams• Close in when there is no pipe in hole


WELL CONTROL EQUIPMENT

Blow out preventersSeal off the well when a kick is detected

Drilling spoolProvides connection for choke and kill lines


Accumulator unitProvides means of opening or closing the BOPs and HCR values

Accumulator bottles• Maintains hydraulic fluid at high pressures• 10gallons Ea• N2 at 1000Psi• Operating pressure of 3000Psi

Pumps• Electric pump automatically pumps hydraulic fluid

to maintain pressure in bottles• Pneumatic pumps are backups

Reservoir • Stores hydraulic fluid (1500L)

Pressure regulators • control pressures to open annular and ram

preventers

WELL CONTROL AND MONITORINGWELL CONTROL EQUIPMENT

Driller’s bop control panelControls opening and closing of BOPs and choke line


• Used to circulate out a kick

• A system of valves and lines provides

several flow routes

• Consists of adjustable manual and

hydraulic chokes

• Chokes are adjusted to keep the right

amount of back pressure on the well

WELL CONTROL AND MONITORINGWELL CONTROL EQUIPMENTChoke manifold

Choke manifold control pannel

• Used to adjust the choke opening

• Watching pressures on drill pipe and casing and

pump rates allows maintaining of a constant BHP


Separates gas from drilling mudDesign features

• Height and diameter to handle mud volumes

• Diameter and length of gas outlet

• Internal baffle plates for gas break out

• U-tube arrangement to maintain fluid head

in separator



Poor boy Degasser

Equipment testing

• BOPs, choke and kill manifolds, choke and kill lines, accumulators must be regularly

pressure and function tested

• Low pressure test 500Psi X5min

• High pressure test 3000psi X10min


Drill string valves

• Kelly cock values• Full opening safety valves (FOSV) or TIW



Trip tank

• Used when POOH or RIH

• Volumes in trip tanks are regularly monitored

• Pump fed

• Isolated from surface mud system to prevent gain or loss in case valves are left open


Flow check

1. Disengage rotary and pick up kelly until tool joints clears rotary table

2. Shut down the mud pump

3. If there is no flow, resume operations. If well is flowing, shut in

Hard shut in

4. Close annular preventer with choke line closed

5. Open choke line with manifold chokes closed

6. Read SIDP and SICP

SHUT IN PROCEDURE



parameter Location/description

Rate of penetration Block Position Indicator sensor mounted on drawworks

Hook load/WOB Load cell on deadline anchor

RPM A metal target is mounted on a coupling shaft between the rotary table and the drive motor

Rotary torque Rotary table transmission

Stand pipe manifold Standpipe Manifold.

SICP Choke Manifold.

Mud flow rate Paddle on mud return line

Pump stroke

H2S mounted on trip tank and Shale shakers.


WELL MONITORING

Engineering

Dk well control