Well Completions Answers

EQUIPMENT EXAM

1) What is the main reason for using tubing nipples in a completion?

a.   to receive flow control devices.

b.   to reduce well flow.

c.   for depth control of wire-line.

2) From which direction are down hole safety valves designed to prevent flow?

a.   both above and below.

b.   below.

c.   above.

3) Which type of closure mechanism is fitted to tubing retrievable down hole safety valves?

TWO ANSWERS

a.   plug

b.   sleeve

c.   gate.

d.   poppet

e.   ball

f.    flapper

4) What is the primary advantage of a wire-line retrievable down hole safety valve?

a.   can be retrieved and replaced.

b.   can be installed after running the tubing

c.   can be removed to allow through tubing intervention work.

d.   simple construction.

5) Which of the following statements about the circulation devices used in a well kill are true?

TWO ANSWERS

a.   check that the pressure rating is adequate for the work to be performed.

b.   check that the tail pipe plug is in place before opening the sleeve.

c.   check the pressure are equalized before opening.

d.   check that the catcher is installed below the sliding sleeve.

e.   check that the device is fully open.

6) How is a surface controlled wire-line retrievable down hole safety valve run in the well in the open position?

a.   with  a prong on the lock mandrel running tool.

b.   with a locked-in hydraulic pressure.

c.   with an automatic ‘J’ device.

d.   with a lock-open sleeve.

7) If a side packet mandrel is not in use, what type of valve is installed in the pocket as a positive closure to flow from either direction?

a.   A circulation valve.

b.   a gas lift valve.

c.   a dummy valve.

d.   a gate valve.

e.   a chemical injection valve.

8) What is the definition of a permanent packer?

1. it can only be retrieved by milling it out.
2. It can be set and retrieved on wire-line.
3. It is fixed to the completion tubing.
4. It is fixed, and can only be retrieved on the completion tubing.
5. It can only retrieved with a special pulling tool.

9) How are lock mandrels locked into tubing nipples?

a.   on a NO-GO shoulders.

b.   with elastomeric packing in a polished nipple bore.

c.   by metal to metal seals.

d.   with mandrel locking dogs and matching nipple recesses.

e.   with slips.

f.    with expanding rubber elements in the nipple bore.

10)  Why is a down hole safety valve installed?

a.   to prevent production in the accidental event of surface valves being opened.

b.   to shut the well in to allow maintenance to surface equipment.

c.   to shut the well in, in an emergency situation.

d.   control production flow rates.

e.   to shut the well in and stop production.

11) Which of the following down hole safety valves are surface controlled?

TWO ANSWERS

a.       Differential pressure valves.

b.      Flapper valve.

c.       Wire-line retrievable valves.

d.      Tubing retrievable valves.

e.       Automatic valve

f.       Ambient pressure valves.

g.      Ball valve.

12) How does a packer create the annulus/tubing seal?

1. By hydraulic control from the surface.
2. It seals off the tubing within the packer bore.
3. In conjunction with the completion tubular it isolates the annulus from the casing below the packer and from the tubing bore.
4. By being located into a tieback receptacle.

13) How do flow control devices seal within the nipple bore?

1. With mandrel locking dogs and matching nipple recesses.
2. By metal to metal seals.
3. With elastomeric packing in a polished nipple bore.
4. With slips
5. With expanding rubber elements in the nipple bore.
6. On no-go shoulders.

14) How would circulation be established if a sliding side door could not be opened for circulation purposes in a completion?

1. Pull the down hole safety valve from the nipple.
2. Connect the tubing and ‘A’ annulus on the surface.
3. Unset the packer.
4. Make a hole in the tubing with a tubing punch.

15) How are well fluids prevented from entering the annulus from the tubing , if a side pocket mandrel is used for gas lifting or chemical injection?

a. by differential pressure.

b. by check valves in the gas lift valves.

c. by venture effect across the port.

16) How are sub-surface controlled down hole safety valves operated?

TWO ANSWERS

a. by ambient pressure.

b. by differential pressure.

c. by hydraulic pressure.

d. by a fall in the temperature of the well bore fluid.

e. by a rise in the temperature of the well bore fluid.

17) Which of the following statements about Xmas tree valves are true?

TWO ANSWERS

a. after closing , a manual valve should be backed out a part of a turn.

b. it is necessary to close the valve as tightly as possible.

c. counting the turns while operating the valve can show if there is an obstruction at the valve.

d. all valves take 24 turns to open or close.

e. the indicator shows how many turns are still required to fully close the valve.

18) Where is a sliding sleeve normally positioned when used as a circulating device?

      a.   Immediately above the packer

      b.   Below the packer in a single zone completion.

      c.   between packers for individual zone production.

19) Which of the following statements about hangers are true?

TWO ANSWERS

a.       It allows communication from inside the completion to the completion annulus through control line ports.

b.      There is usually a place for a plug inside the hanger body.

c.       It supports the weight of the top of the completion.

d.      It supports the weight of the completion and top string of casing.

e.       It allows communication into the completion annulus through the control line.

20) What is the primary purpose of a packer in producing a well?

a.       To retain completion fluid in the annulus.

b.      To anchor the bottom of the tubing

c.       To support tubing weight

d.      To enable the completion annulus to be isolated.

21) Which type of down hole safety valve has the largest inside diameter for the same completion tubing size?

a.       Ambient

b.      Wire-line retrievable

c.       Pressure differential

d.      Tubing retrievable

22) What is the purpose of a side pocket mandrel?

1. To provide a communication path between the tubing bore and the casing annulus.
2. To plug the tubing.
3. To be a receptacle for wire-line safety valve.
4. To provide a profile for landing flow control devices.

23) What is the primary purpose of a sliding sleeve or sliding side door?

1. To provide a communication path between the tubing bore and the casing annulus.
2. To close off the tubing bore.
3. To close off the annulus.

24) What is the primary purpose of a DHSV?

1. To provide a communication path between the tubing bore and the casing annulus.
2. To close off the tubing bore.
3. To close off the annulus.

25) A well equipped with a flapper type subsurface safety valve with damaged control line:

1. Can be killed by bull-heading and the valve can be recovered.
2. Need coiled tubing to open the valve.
3. Cannot be killed, the valve needs to be milled.

26) If 20,000 feet of 1.5” coiled tubing of 1.25” ID was used to acidize a well, the volume of displacement fluid required to displace acid to CT shoe is:

1. 45 bbl
2. 30 bbl
3. 20 bbl

27) What is the primary reason that determines the setting depth of a down hole safety valve?

1. Prevent accidental penetration by drilling tools from an adjacent well.
2. Prevent deliberate sabotage.
3. Below any possible depth where damage could occur to the valve from surface impact.
4. Below catering depth in case of potential blow out around the casing.
5. As close as possible to the packer to keep the well pressure as deep as possible
6. As high as possible to reduce the inventory of well fluids that may escape above the valve.

28) Which one of the following statements about the Xmas tree is true?

1. Any swab valve can be used to cut the slick-line.
2. Any kill wing valve can be used to cut the slick-line.
3. Some master valves can be used to cut the slick-line.
4. Any flow wing valve can be used to cut the slick-line.

29) What are the generic types of packers available for completions?

TWO ANSWERS

1. Retrievable
2. Permanent
3. Check valve
4. Bridge plug
5. Pump through

30) What is the primary purpose of NO-GO shoulders?

1. To take the load o differential forces across the tools
2. To lock mandrels into the tubing nipples.
3. In the bottom of the nipple to prevent tools from falling out of the tubing.
4. To locate lock mandrels to their particular matching nipples.

31) Where is the packer normally positioned in the completion string?

1. Above, but close to, the top perforations.
2. As close to the tubing hanger as possible.
3. Below the perforations.
4. Half way between the perforations and the tubing hanger.

32) What is the first action to take to re-instate production in a well with a failed tubing retrievable down hole safety valve?

1. Lock the valve mechanism open and install a wireline insert valve.
2. Perform a work-over.
3. Lock the valve mechanism open.

34)  What are the normal safe methods of establishing temporary communication between the tubing and annulus for circulation purposes? 

TWO ANSWERS

a. Install a circulation valve inside a side pocket mandrel.

b. Open the Sliding sleeve door.

c. Use a tubing punch to punch a hole in tubing.

35) Why is an annulus safety valve installed?

a.       To prevent back flow from the gas filled annulus in a gas lift well.

b.      To close off flow into the annulus.

c.       In place of a tubing safety valve.

36) How does a Surface Controlled Wireline Retrievable DHSV make hydraulic communication?

a.       Between 2 packing seal stacks, once the lock mandrel is set.

b.      Through an opening on the Sliding Sleeve.

c.       Through a hydrostatic stab.

37) How does a failed subsurface controlled DHSV close?

a.                   Pressure decrease in the tubing.

b.                  Hydraulic pressure loss in control line.

c.                   Malfunctioning communication seals.