Tag Archives: Well Control Quiz

The well is shut in and Shut In Drill Pipe Pressure (SIDPP) = 900 psi. Current depth of the well is 12,500′ MD/12,500′ TVD.
Mud weight in hole is 13.0 ppg.
What is the kill weight mud for this well (round up figure)?

The well is shut in and pressures are observed as follows: Shut In Casing Pressure (SICP) = 500 psi, Shut In Drill Pipe Pressure (SIDPP) = 400 psi. Current depth of the well is 9,500′ MD/9,000′ TVD.  Mud weight in hole is 10.4 ppg.

What is the kill weight mud for this well (round up figure)?

Well information: LOT = 16.0 ppg, mud weight = 10.0 ppg and well depth = 6,000’MD/5,000’TVD.

What is the MAASP (Maximum Allowable Surface Pressure)?

Well information: LOT = 15.5 ppg, mud weight = 11.0 ppg and well depth = 7,000’MD/6,500’TVD.

What is the MAASP (Maximum Allowable Surface Pressure)?

Drill pipe capacity is 0.0188 bbl/ft.
Drill collar capacity is 0.0078 bbl/ft.

Well depth is at 12,000’MD/11,000’TVD.
Drill collar length is 1,000 ft.

What is the string volume for this case?

The total string volume is 250 bbl and pump output is 0.102 bbl/stroke.

How many strokes are required to pump mud to the bit?

Well depth is 12,000’MD/10,000’TVD.
Drill collar length is 1,000 ft.
Casing shoe depth is 6,000 ft.
Annular capacity between drill pipe and open hole = 0.0559 bbl/ft.
Annular capacity between drill pipe and casing = 0.0680 bbl/ft
Annular capacity between drill collar and open hole = 0.031 bbl/ft
Pump output = 0.131 bbl/stroke

How many strokes are required to circulate from bottom up to surface?

7″ casing shoe is set at 6,500’MD/6,000’TVD.
Leak Off Test (LOT) is performed with 9.2 ppg mud and leak off pressure is 1,600 psi.

What is the equivalent mud weight for LOT at shoe?

7″ casing shoe is set at 7,500’MD/7,000’TVD.
Leak Off Test (LOT) is performed with 10.0 ppg mud and leak off pressure is 1,200 psi.

What is the leak off pressure at 7″ shoe?

Current mud weight = 10.5 ppg. Casing shoe = 8000’MD/7,500’TVD. Perform leak off test with 9.5 ppg mud. Leak off pressure = 2,500 psi.

What is MAASP?

When should personnel re-calculate MAASP?

String volume is 65 bbl. Pump output is 0.102 bbl/stroke.
If the circulation is performed at 30 SPM, how long will it take to circulate kill mud to the bit?

Fracture gradient at shoe is 0.71 psi/ft.
Casing shoe = 8,000’MD/7,000’TVD.
Current mud weight is 11.5 ppg.

How much pressure can be shut in before breaking formation at shoe?

Annulus volume is 320 bbl. Pump output is 0.155 bbl/stroke.

If the circulation is performed at 40 SPM, how long will it take to circulate bottom up?

7″ casing shoe is set at 7,500’MD/6,500′ TVD. LOT performed using 9.5 ppg mud is equivalent to 16.5 ppg at 7″ casing shoe.
Current depth of the well is 12,000’MD/10,000′ TVD and mud weight while drilling is 10.5 ppg.

What is the MAASP?

Current depth of the well is 9,800’MD/9,000’TVD. The well takes 20 bbl kick while drilling with 13.0 ppg mud.
SICP = 1500 psi and SIDP = 600 psi

What is the kill weight mud?

The well is shut in and 15 bbl of pit gain observed. There is 800 ft of drill collar as BHA.

Annular capacity DC and OH = 0.0766 bbl/ft.

What is the influx height?

The well is shut in while drilling at 10,000’MD/9,000’TVD. Pit gain is 60 bbl. BHA consists of drill collar whose length is 600 ft.
Annular capacity DC and OH = 0.0376 bbl/ft.
Annular capacity DP and OH = 0.0680 bbl/ft.

What is the influx height?

The well is shut in but SIDPP is “0” because there is a float sub in the drill string?

What is the proper way to determine SIDPP?

The well is shut in due to gas kick and the current mud weight = 13.0 ppg.

Well information: Well depth = 12,000’MD/11,000’TVD, SIPP = 900, SICP = 1200, pit gain 20 bbl and annular capacity = 0.0350 bbl/ft.

What is the influx gradient?

Well information: SIDPP = 900 psi, SICP = 1200 psi, MAASP = 2,100 psi, Slow Circulating Rate (SCR) = 750 psi, Annular pressure loss = 300 psi.

What is Initial Circulating Pressure (ICP)?

Well information: SIDPP = 900 psi, SICP = 1200 psi, MAASP = 2,100 psi, Slow Circulating Rate (SCR) = 750 psi, Annular pressure loss = 300 psi.
Current depth = 13,000’MD/11,000’TVD. Mud weight in hole = 13.0 ppg.

What is the kill weight mud with 100 psi safety margin?

At 35 SPM with 12.0 ppg, Slow Circulating Pressure (SCR) is 350 psi. Kill weight mud require is 13.5 ppg.

What is the Final Circulating Pressure (FCP)?

The well is shut in due to kick into the wellbore. Current detph is 9,500′ MD/8,500′ TVD. SICP = 450 psi and SIDPP  = 300 psi.
Bring the pump up to speed at 30 spm and drill pipe pressure reading is 1,200 psi.

What is the Slow Circulating Pressure at 30 spm?

The well is shut in due to kick into the wellbore. Current detph is 9,500′ MD/8,500′ TVD and mud weight is 10.0 ppg.
SICP = 450 psi and SIDPP  = 300 psi.
Bring the pump up to speed at 30 spm and drill pipe pressure reading is 1,200 psi.

What is the Final Circulating Pressure at 30 spm?