Coiled Tubing Exam - Rikline International Limited

Coiled Tubing Exam

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1 / 30

You plan to run a production logging tool (PLT) on coiled tubing in a sand producing well.

Which potential situation should you prepare for?

The coiled tubing could buckle.

The coiled tubing may collapse.

The rotating joint on the reel may become blocked.

The coiled tubing may become stuck.

2 / 30

During a coiled tubing programme, you plan to circulate solids out of the well. What must you do before starting the operation?

Plan to run the coiled tubing as deep into the solids as possible.

Measure the size of the solids to make sure you use the correct size

Calculate the lift velocity to make sure you use the correct pump rate.

Rig up a line to the 'A' annulus to divert the solids away from the loca surface.

3 / 30

The location alarm sounded when coiled tubing was deep in the well. The operation suspended. The crew went to the muster point.

It is now safe to continue the coiled tubing intervention. What should you do next?

Inflow test the coiled tubing BHA downhole check valves.

Run the coiled tubing into the well and tag the hold-up depth (HUD)

Pick up the coiled tubing BHA and start circulating.

Pull the coiled tubing out of the well and close the Xmas Tree.

4 / 30

What is the main function of deployment bars when using a coiled tubing pressurised deployment system to run long BHAs into live wells?

To attach the BHA to the coiled tubing string.

To hang-off the BHA in the mouse hole.

To drop into the coiled tubing string to rele se the BHA should it become stuck.

To hang the lower BHA within the BOP and maintain well isolation.

5 / 30

When running into the well, the coiled tubing breaks as it passes through the measuring head in front of the reel.
The operator stops running the coiled tubing, shuts down the pumps, and closes the slip and pipe ram BOPs.

After a short time, there is flow from the coiled tubing in the well. What action is required next?

Run the broken end of the coiled tubing into the well.
Close the Xmas Tree valves

Pump kill fluid down the completion tubing.

Open the slip and pipe ram BOPs.
Drop the coiled tubing.
Close the blind ram BOP.

Close the shear ram BOP.
Move the broken end of the coiled tubing up.
Close the blind ram BOP.

6 / 30

You are planning a coiled tubing operation in a well with large diameter completion tubing.

What is an important thing to consider when choosing the size of coiled tubing for these well conditions?

How the well flow rate will affect coiled tubing erosion.

How coiled tubing buckling may prevent access deep into the well.

How the corrosion rate of the coiled tubing is affected.

How the BHA connects to the coiled tubing.

7 / 30

During a coiled tubing clean out operation, nitrogen (N2) and fluid returns are directed through a three-phase separator. The separator cannot cope with the liquid returns, and the flow control valves close. How would you make the well safe?

Open the kill wing valve and pump kill fluid.

Stop pumping and close the Xmas Tree upper master valve.

Stop pumping and close the subsurface safety valve (SSSV).

Stop pumping and close the return line valves.

8 / 30

Coiled tubing is deep in a gas well when there is a serious leak at the reel and the coiled tubing is full of scale treatment fluid.
You shut down the fluid pump and close the quad BOP slip rams and pipe rams. Flow from the leak stops.

Why has the leak stopped?

The downhole check valves have functioned.

A hydrate has formed in the reel.

The fluid in the coiled tubing has killed the well.

The production tubing has collapsed.

9 / 30

There is a pinhole leak in the coiled tubing at surface. What keeps the check valves closed?

The coiled tubing pump pressure.

The fluid in the coiled tubing.

The closing springs in the BHA.

The pressure differential across the check valves

10 / 30

What should you close if the rotating joint on the coiled tubing reel is leaking?

The blind ram BOP.

The pipe ram BOP.

The reel isolation valve inside the reel.

The flow wing valve on the Xmas Tree.

11 / 30

What is the purpose of a stripper in a coiled tubing PCE rig up?

To prevent well fluids escaping to atmosphere when running and pulling coiled tubing.

To cut the coiled tubing during an emergency.

To make sure the coiled tubing does not run uncontrolled into the well.

To remove well fluids from the coiled tubing when pulling out of the well.sure the coiled tubing does not run uncontrolled into the well.

12 / 30

Trapped air within the coiled tubing PCE is affecting the results of the pressure test.

What should you do?

Relax the stripper elements until all air is removed from the PCE.

Open the side outlet valve to remove all air from the PCE.

Drain the test fluid and pressure test the PCE with well pressure.

Close and inflow test the pipe rams, then apply pressure above them.

13 / 30

The well is live, and the coiled tubing is filled with fresh water.

What barriers should be in place to allow the repair of a rotating joint when coiled tubing is in the well?

The pump isolation valve and the Xmas Tree kill wing valve.

The coiled tubing pipe rams and slip rams.

The reel isolation valve and the downhole check valves.

The pump isolation valves and the downhole check valves.

14 / 30

Figure CT0-0002 shows coiled tubing PCE rigged up on a Xmas Tree.

Figure CT0-0002

You plan to change the upper stripper element of a dual stripper. You will use the pipe rams and the lower stripper element as barrier elements.

How can you tell if the pipe rams are leaking during an inflow test?

Pressure will build up between the pipe rams and the lower stripper element.

Pressure will build up between the pipe rams and the Xmas Tree.

Pressure will build up between the lower stripper element and the upper stripper element.

Pressure will build up between the injector head and the upper stripper element.

15 / 30

You are using coiled tubing to run a long BHA with a large OD into a well (Figure CT0-0006).

Figure CT0-0006

The stripper starts to leak when the BHA is across the Xmas Tree and BOPs.

What should you use to safely shut the well?

The shear/seal BOP.

The annular BOP.

The Xmas Tree upper master gate valve.

The pipe ram BOP.

16 / 30

In a coiled tubing nitrogen-lift operation, where should the surface choke be positioned?

Immediately below the coiled tubing stripper.

Downstream of the 'A' annulus outlet on the wellhead.

Downstream of the Xmas Tree.

At the coiled tubing reel swivel.

17 / 30

While running in hole, the coiled tubing has accidentally been run into debris and the down hole check valves are no longer holding pressure. Attempts to clear the debris by pumping through the coiled tubing have been unsuccessful. What should you do next?

Shut down the pump and flow the well with the coiled tubing SHA just above the debris.

Pull the coiled tubing up quickly then run back down. Repeat this several times to help dislodge the debris trapped within the coiled tubing SHA.

Maintain circulation through the coiled tubing while pulling back to surface to make repairs.

Pump into the production tubing, taking returns through the coiled tubing to clear the check valves of debris.

18 / 30

In a quad BOP, why are coiled tubing shear rams placed above the pipe and slip rams?

So that the coiled tubing can be held in the pipe rams for pressure testing the blind rams before running in the well.

So that the coiled tubing can be sheared and dropped below the Xmas Tree.

So that the coiled tubing can be held in the slips and sealed with the pipe rams before shearing.

So that the BOPs can be inflow tested and pressure tested with coiled tubing in the well.

19 / 30

A well has been circulated with nitrogen (N2). In which situation would the coiled tubing BHA check valves close?

When the pressure in the coiled tubing BHA is less than the pressure at the same point within the well.

When nitrogen continues to be pumped into the coiled tubing.

When the pressure in the coiled tubing BHA is more than the pressure at the same point within the well.

When starting to pump completion fluid into the coiled tubing.

20 / 30

Which BHA component prevents reverse circulation into the coiled tubing?

The downhole check valves.

The shear sub.

The fluted centraliser.

The coiled tubing connector.

21 / 30

When pulling coiled tubing out of the well, you see that the coiled tubing is slipping at the injector head.

Why has this happened?

The injector head coil gripping pressure is too low.

The coiled tubing is not the correct size for the injector head.

The stripper pressure is too low.

The well pressure is higher than the injector head working pressure.

22 / 30

Due to height limitations, the coiled tubing PCE rig up must be as short as possible.

How could you reduce the height of the PCE?

Rig up a single stripper and move the standard quad BOP directly on top of the Xmas Tree.

Replace the standard quad BOP with a combi BOP.

Remove the check valves from the BHA and rig up a short riser.

Remove the riser and use the closed surface controlled subsurface safety valve (SCSSSV) to install the BHA.

23 / 30

Figure CT0-0003 shows coiled tubing PCE rigged up on a Xmas Tree.

Figure CT0-0003

The coiled tubing bottomhole assembly (BHA) is in the riser when the stripper rubbers begin to leak. How do you close in the well quickly and safely?

Close the subsurface safety valve (SSSV).

Close the blind rams.

Close the shear rams.

Close the Xmas Tree upper master valve.

24 / 30

What is an advantage of using a combi coiled tubing BOP?

It reduces the rig up height.

It can be used to run slickline.

It can shear thicker coiled tubing than a quad BOP

It has more rams than a standard quad BOP.

25 / 30

When pumping water through the coiled tubing, the fluid pump fails.

The pressure is bled off from the coiled tubing while the pump is being repaired. What will be the first sign that the coiled tubing has collapsed?

The coiled tubing does not pass the injector head.

The weight indicator shows a loss of weight when picking up off bottom.

Well fluids are escaping to the atmosphere through the stripper.

You will be unable to regain circulation after the pump is started.

26 / 30

The injector head fails during a coiled tubing acid scale removal operation. The BHA is at the tubing retrievable surface controlled subsurface safety valve (TRSCSSSV) and cannot be moved.

The coiled tubing is full of acid.

What should you do to maintain well integrity?

Close the BOP shear/seal rams and kill the well.

Bullhead fresh water into the 'A' annulus to prevent tubing burst.

Pump nitrogen into the completion tubing.

Circulate a neutralising fluid into the well through the coiled tubing.

27 / 30

In a coiled tubing nitrogen (N2) lift operation, well fluids are flowing through the flow wing into a clean up package.

How should you shut in the well?

Continue pumping and close the flow wing valve.

Stop pumping, close the choke and then close the flow wing valve.

Stop pumping, close the pipe rams and then close the flow wing valve.

Close the flow wing valve and then stop pumping.

28 / 30

During a coiled tubing intervention in a dry gas well, the coiled tubing stripper rubbers need to be replaced frequently.

What could be the reason for this?

The coiled tubing has internal corrosion.

The wellhead temperature is too low.

The stripper pressure is too high.

The gas has low CO2 content.

29 / 30

When using coiled tubing to pump acid at the perforations, there is a sudden pressure increase and a surface relief valve opens.

What should you do?

Shear the coiled tubing and c)ose the Xmas Tree.

Kill the well by bullheading down the production tubing.

Stop pumping acid. Flush surface.lines to a safe area and investigate.

Isolate the relief valve and increase the pressure to try to clear the blockage.

30 / 30

You plan to run coiled tubing into a well to mill scale.

Why is it important to consider coiled tubing diameter?

To ensure the volume of the completion tubing is greater than the vol·u me of the coiled tubing.

To ensure there is enough clearance on the outside of the coiled tubing to keep pumping pressures high.

To ensure the annular velocity can lift the scale back to surface.

To ensure coiled tubing does not collapse if too much weight is applied while pushing through the scale.

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