How is casing pressure measured?
How is casing pressure measured?
Casing pressure is generally measured in pounds per square inch, or PSI, because most of the tubing and casing involved in well drilling has a certain maximum PSI load that it can support before cracking, blowing out, or otherwise failing.
What is maximum casing pressure?
Maximum Initial Shut-In Casing Pressure (MISICP) or Maximum allowable shut in casing pressure is the initial shut-in casing pressure that will exceed formation strength at the casing shoe resulting in broken formation at the shoe.
What is the casing pressure?
Casing Pressure is the pressure required in drill pipes or tubing annulus in order to maintain smooth well control operations. An optimal amount of Casing Pressure is needed whenever a well is being drilling or when well workover operations are being carried out.
What is casing pressure test?
The casing pressure test evaluates the mechanical integrity of the well casing. The well casing has mechanical integrity if there are no significant leaks in the casing. The mechanical integrity of the well casing is evaluated by conducting a hydraulic pressure test and monitoring for a pressure loss.
What is drill pipe pressure?
Shut-in drill pipe pressure is the pressure of a drilling fluid inside the drill stem. It is majorly used for measuring the difference between the formation pressure and the hydrostatic pressure when the well is shut after a mud pump is turned off. It calculates the required mud weight increase to kill the well.
What is Maasp in drilling?
Maximum Allowable Annular Surface Pressure (MAASP) is the maximum annular pressure which will cause formation break down. MAASP can be in a static condition and a dynamic condition (circulating).
How do you calculate maximum allowable casing pressure?
The Maximum Allowable Annular Surface Pressure (MAASP) equals the formation breakdown pressure at the point under consideration minus the hydrostatic head of the mud/or influx in the casing.
What is well annulus pressure?
Annular Pressure is the pressure exerted by the hydrocarbons in the annulus of a well or between two strings of casing inside a producing well.
What is shoe bond test?
Shoe Bond Test (SBT) The shoe bond test is performed in order to evaluate the integrity of cement around the shoe. The shoe bond test is performed by the cementing unit; the testing fluid (drilling mud) can be pumped through the choke manifold (through the annulus) or through the drill pipe using a circulating head.
What is casing shoe test?
“Casing shoe test” means a pressure test conducted after drilling into the confining strata below a cemented casing string seat to evaluate pressure containment integrity and to determine the maximum fluid density that the strata can contain without breaking down.
What is wait and weight method?
Wait and Weight Well Control Method or someone calls Engineer’s Method is a method to control well with one circulation. Kill weight mud is displaced into drill string and kick (wellbore influx) is removed while displacing a wellbore.
When should Maasp be recalculated?
While LOT, MAASP is equal to the surface leak off pressure for the test fluid density. Since the maximum allowable mud density is a fixed quantity here, thus, MAASP should always be recalculated whenever the mud density changes.
What are the requirements for pressure testing of casing?
§ 250.1609 Pressure testing of casing. (a) Prior to drilling the plug after cementing, all casing strings, except the drive or structural casing, shall be pressure tested. The conductor casing shall be tested to at least 200 psi. All casing strings below the conductor casing shall be tested to 500 psi or 0.22 psi/ft, whichever is greater.
What does the 30 CFR say about pressure testing?
30 CFR § 250.1609 – Pressure testing of casing. § 250.1609 Pressure testing of casing. (a) Prior to drilling the plug after cementing, all casing strings, except the drive or structural casing, shall be pressure tested. The conductor casing shall be tested to at least 200 psi.
When do you need to test the casing strings?
All casing strings below the conductor casing shall be tested to 500 psi or 0.22 psi/ft, whichever is greater. (When oil or gas is not present in the cap rock, the production liner need not be cemented in place; thus, it would not be subject to pressure testing.) If the pressure declines more…
When does sustained casing pressure occur on the OCS?
A REVIEW OF SUSTAINED CASING PRESSURE OCCURRING ON THE OCS ADAM T. BOURGOYNE, JR., LSU STUART L. SCOTT, LSU WOJCIECH MANOWSKI, DOWELL-SCHLUMBERGER 1111