The Hole Must Be Kept Full At All Times

A full opening or safety valve should be available at all times on the drill floor together with the required crossover subs. A non-return (i.e. grey) valve should also be readily available.

Figure 2.3

Figure 2.2 NON RETURN SAFETY VALVE (GREY VALVE)

Mud Pump Parts Swab
Trip Margin (Safety Factor)

Trip Margin (Safety Factor) is an overbalance to compensate for the loss of ECD and to overcome the effects of swab pressures during a trip out of the hole.

SECTION 2 : CAUSES OF KICKS

Flow Checks

Flow checks are performed to ensure that the well is stable. Flow checks should be carried out with the pumps off to check the well with ECD effects removed. Flow checks are usually performed when a trip is going to take place at the following minimum places:

  • on bottom
  • at the casing shoe
  • before the BHA is pulled into the BOP's Short Trips/Wiper Trips

In some circumstances prior to pulling out of the hole a short trip, 5 or 10 stands should be considered. The well is then circulated and mud returns carefully monitored.

Pumping a Slug of Heavy Mud

This is a practice often carried out to enable the pipe to be pulled dry and the hole to be more accurately monitored during the trip. The following equation is used to calculate the dry pipe volume for the slug pumped:

Dry Pipe Volume = Slug Volume x (Slug Weight ^ Mud Weight - 1)

This dry pipe volume can be converted to Dry Pipe Length by dividing this volume by the internal capacity of the pipe as illustrated in the following equation:

Dry Pipe Length = Dry Pipe Volume (bbls) ^ Drill Pipe Capacity (bbls/ft)

Mud Logging

A logging unit if available is extremely important particularly with respect to well control. The unit carries out some of the following services:

Gas detection in the mud

Gas analysis

Cuttings density analysis Recording mud densities in and out Recording flow line temperatures Recording penetration rates Pore Pressure Trends

SECTION 2 : CAUSES OF KICKS

A typical mud logging system is illustrated in Figure 2.4 below.

SWIVEL

KELLY

A typical mud logging system is illustrated in Figure 2.4 below.

Mud Bop Kick Well Control

SWIVEL

KELLY

VDU IN COMPANY REP'S OFFICE

VDU IN COMPANY REP'S OFFICE

SECTION 2 : CAUSES OF KICKS

Communication

If a transfer of mud to the active system is requested the driller will be informed, the logging unit must likewise be informed. Good communication all round is essential.

Alarms

The high and low settings for the pit level recorder and flow line recorder must be checked and are set to appropriate values.

Was this article helpful?

0 0
Serious MLM Mistakes

Serious MLM Mistakes

Discover the Pitfalls and Traps in Network Marketing that You Can Avoid Saving You TONS of Time, Money amp Mistakes. to the exciting follow-up book on Network Marketing. In the first book, we have explored on one of the most important yet least talked about, most overlooked aspect of network marketing or Multi-level Marketing MLM.

Get My Free Ebook


Responses

  • joseph
    What is low trip Margin?
    4 years ago
  • patrick
    When are you expected to carry out a flow check during trip out of hole?
    4 years ago

Post a comment