How To Measure Choke Line Friction (CLF) for Deepwater Well Control

Choke Line Friction is one of critical figures that personnel on the rig need to know and this numbers can be determined.

how-to-measure-CLF

The procedures for the choke line friction determination are as follows;


1. Line up to circulate into choke line

Figure 1 - Line Up

Figure 1 – Line Up

2. Circulate down the choke line and up into riser. This will not add significant pressure to bottom hole. When you measure the pressure you need to know mud density and rheology and it is very important that you wait until you get the stabilized pressure reading.

Figure 2 - Circulate down choke line
Figure 2 – Circulate down choke line

3. Record CLF at expected kill rates for well control as 10 SPM, 20 SPM, 30 SPM, etc. This will give you an idea how much CLF at particular flow rate. The table below demonstrates the pre-recorded CLF
Flow Rate (SPM) Choke Line Pressure (psi) Mud Weight (ppg)

Table 1 Pre Recorded CLF
Table 1 Pre Recorded CLF

This procedure can be performed any time while drilling and we recommend you to check the CLF when drilling fluid properties have been changed a lot from the previous test. Additionally, you can use the same procedure to measure the frictional pressure at the kill line too.

Reference books: Well Control Books

Related Post

Understand About Formation Pressure Formation pressure is the pressure of fluid contained in pore space of rock and there are 3 categories of the formation pressure which are normal pres...
Determine Correct Initial Circulating Pressure (IC... Correct initial circulating pressure is very important for well control operation because the correct ICP figure will tell you about the balance point...
What is “Background Gas”? While we are drilling, there is a stable gas reading that is not connected with either bottoms up gas or drilled gas is generally called “Background G...
What is “Trip Gas”? With static wellbore condition, any gas entering into mud while tripping is called “Trip Gas”. Gas will be seen while circulating bottom up after trip...
Share the joy
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  
  •  

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.
Tagged , , . Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *