In some cases, losses can be seen while running the casing or circulating before cementing. This opens the alternative to pump an LCM pill as a possible mitigation to lower the losses ahead of the cement job. However, based on experience with float equipment, the following actions are recommended:
- Always implement the equipment manufacturer 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 showed 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 need to consider use of LCM. Experience showed that the cement itself during primary cementing would likely cure losses. If applicable, consider increase the cement excess, instead of using LCM.
- Maximum concentration to consider is 60 ppb of LCM.
- Do not use 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.