Experimental Study of Loss Circulation Materials Bridging Performance in K/Na-formate based Drilling Fluids
Master thesis
Permanent lenke
https://hdl.handle.net/11250/2987161Utgivelsesdato
2021Metadata
Vis full innførselSamlinger
- Studentoppgaver (TN-IEP) [323]
Sammendrag
The loss of drilling fluid is one of the main concerns of the petroleum industry, causingexcessive expenditure both for operational and increasing the non-productive drilling time(NPT). The NPT associated with loss circulation issues cost the oil industry a lot. Thepreventive and corrective methods are the main techniques to manage the loss circulation in awellbore. Lost circulation materials (LCM) have been widely used to prevent fluid loss into theformation, but the use of these materials depends on the types of formation, the loss zones, andthe degree of severity of the losses.
In this thesis, a total of four experimental tests are designed to systematically investigatethe bridging performance of LCM in laboratory synthesized K- and Na-formate based drill-influids. The static high pressure LCM bridge test apparatus with different artificial fracture slotwidths were used for the investigations.
The test results showed that the bridging performance of LCM materials in the K- andNa-formate drilling fluids are almost the same, and a strong fracture bridge is obtained bymixing very small with medium and coarse that creates an improved packing of pistachioparticles. Another observation from this work is that the LCM used in drill-in drilling fluid,CaCO3, is mechanically weak. However, the blending of CaCO3 with Quartz increased thebridge strength and showed positive synergy as compared with their separate performances.