Using LCM through float equipment before cementing
In some cases, we can see losses while running the casing or circulating before cementing. These losses open up the alternative to pump a Loss Circulation Material (LCM) pill as a possible mitigation to lower the losses ahead of the cement job. However, based on experience with float LCM equipment, the following actions are recommended:
- Always implement the equipment manufacturers recommendation for LCM through float equipment. If no recommendation from the manufacturer is available, do not pump LCM.
- Previous use of LCM through float equipment has shown limited to no success in reducing losses while cementing.
- If LCM pills are ultimately used:
- Define the maximum allowable loss rate before cementing the casing without the need to consider the use of an LCM pill. Experience has shown that the cement itself is likely to cure losses during primary cementing. If applicable, consider increasing the cement excess, instead of using LCM.
- Maximum concentration to consider is 60 ppb of LCM.
- Do not use a coarse material, recommended < 1 mm (not a standard value. Applicable size shall be reviewed with the equipment manufacturer)
- LCM might worsen the situation: Adding more solids to an annulus that might not be cuttings free.