How do you calculate maximum allowable casing pressure?
The MAASP can be determined from the following equation: MAASP = Maximum Allowable pressure at the formation just below the shoe minus the Hydrostatic Pressure of mud at the formation just below the shoe.
What is ICP in well control?
ICP is initial circulating pressure in psi. SIDPP is shut in drill pipe pressure in psi.
What is well control method?
Definition. Well-control means methods used to minimize the potential for the well to flow or kick and to maintain control of the well in the event of flow or a kick. Well-control applies to drilling, well-completion, well-workover, abandonment, and well-servicing operations.
What is Maasp in well control?
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 is Sicp calculated?
The shut-in casing pressure (SICP) is a measure of the difference between the formation pressure and the HSP in the annulus when a kick occurs. The pressures encountered in the annulus can be estimated using the following mathematical equation: FP = HSPmud + HSPinflux + SICP.
What is wait and weight method?
The Wait and Weight method requires only one circulation. The influx will be circulated out while the kill weight mud is displaced into the well simultaneously. While pumping the kill fluid from surface to the bit, drill pipe pressure schedule must be strictly followed.
How do you calculate hydrostatic pressure in a well?
In US oilfield units, this is calculated using the equation: P=MW*Depth*0.052, where MW is the drilling fluid density in pounds per gallon, Depth is the true vertical depth or “head” in feet, and 0.052 is a unit conversion factor chosen such that P results in units of pounds per square in. (psi).
What is well control equipment?
Well control equipment includes all equipment used to: detect unplanned influxes of formation fluids into the well; prevent, control or divert the flow of fluids from the well; purge formation fluids from the well; separate formation fluids from the drilling fluid.
How do you calculate bottom hole pressure?
Bottom Hole Pressure Relationship
- Bottom Hole Pressure (BHP) = Surface Pressure (SP) + Hydrostatic Pressure (HP)
- The first case: Hydrostatic column is water which is equal to formation pressure gradient so SP is equal to 0 psi.
What is Trip margin?
An incremental increase in drilling fluid density to provide an increment of overbalance in order to compensate for effects of swabbing.
What is kick tolerance?
Kick Tolerance is the maximum volume of gas kick in barrels that we are able to successfully shut the well in and circulate the kick out of hole without breaking formation strength at shoe depth or overcoming the weakest anticipated facture pressure in wellbore.In order to calculate kick tolerance, we need to assume …
What is Sicp and SIDP?
Shut-in drillpipe pressure (SIDPP) is generally lower than shut-in casing pressure (SICP) because the kick density is usually much lighter than the fluid in use. If the influx is liquid and has a higher density than the fluid in use, SIDPP will be higher than SICP. This is common in some remedial operations.
What is driller method?
Driller’s method is one of several methods to kill the well. The main idea of driller method is to kill the well with constant bottom hole pressure. The Driller’s Method of well control requires two complete and separate circulations of drilling fluid in the well.
What is the volumetric method of well control?
Volumetric well control method is a special well control method which will be used when the normal circulation cannot be done. It is not a kill method but it the method to control bottom hole pressure and allow influx to migrate without causing any damage to the well.
How do I select the proper well control method?
The selection of the proper well control method depends mostly on the situation on the rig at the time of the kick, the familiarity with the various methods and experience of the man in charge, and company or government policy for the particular area.
What is capacity volume and displacement in well control?
CAPACITY, VOLUME, DISPLACEMENT CALCULATIONS In well control and in routine drilling operations frequent calculations of capacity, volume, and displacement must be made. A brief review of the mechanics involved is included in this section. Capacity refers to the volume of fluid a container is capable of holding.
What happens if a well is not controlled?
If uncontrolled, this cycle will continue until all of the WSF is displaced and formation fluids flow from the well. For this reason, even a short delay in implementing proper well control procedures can greatly increase the difficulty experienced in regaining well control.
How does well control work?
In the case of well control, the objective is to pump a workover fluid down the tubing and drive the formation fluids out of the tubing, through perforations and back into the formation.