Category Archives: Well Control

Estimate gas migration rate in a shut in well

By | | , , ,
2 Comments

Migration is natural behavior of gas. It means that when you shut the well in, gas will migrate from bottom to top of the well.

We can estimate the gas migration rate in a shut-in well with this following equation.

Continue reading →

Estimate Type of Influx (kick)

By | | , ,
2 Comments

From the previous topic, estimate Height of Influx, you can use influx height to estimate type of influx.

The following equation is used for estimating type of influx:

Note: You can prove the equation by using the U-tube concept.

Where;

Influx weight in ppg

Current mud weight in ppg

SICP stands for Shut In Casing Pressure in psi.

SIDPP stands for Shut In Drill Pipe Pressure in psi.

Influx height in ft

Continue reading →

Accumulator (Koomey)

By | | ,
46 Comments

An accumulator or Koomey unit is a unit used to hydraulically operate Rams BOP, Annular BOP, HCR and some hydraulic equipment. There are several of high pressure cylinders that store gas (in bladders) and hydraulic fluid or water under pressure for hydraulic activated systems. The primary purpose of this unit is to supply hydraulic power to the BOP stack in order to close/open BOP stack for both normal operational and emergency situation. Stored hydraulic in the system can provide hydraulic power to close BOP’s in well control operation, therefore, kick volume will be minimized. The accumulator should have sufficient volume to close/open all preventers and accumulator pressure must be maintained all time. According to API RP53, your reservoir tank should have a total volume at least 2 times of usable volume to close all BOP equipment.

Continue reading →