... Abstract Lost circulation during drilling operations is a persistent challenge in the oil and gas industry, leading to significant financial losses and increased non-productive time. The common use of lost circulation materials (LCMs) in drilling fluids helps mitigate mud loss only to an extent...

.... Abstract The rise of anomalies like kicks, blowouts, lost circulation, and gas migration in drilling operations poses significant challenges to safety, environmental sustainability, and economic stability. Implementing frameworks for proactive monitoring and accurate anomaly detection is crucial...

... Abstract Loss of drilling mud circulation presents one of the biggest threats to safe wells delivery, hence it is pertinent to understand fracture gradient and loss circulation mechanisms across the different lithologies in well drilling operations. The fracture gradient is an important...

... Abstract Designing a drilling mud with relevant additives plays a vital role in having a successful drilling operation to sustain oil and gas supply. When a drilling fluid is poorly formulated with deficient additives, various problems such as loss circulation of drilling mud usually occur...

... Abstract Drilling through depleted and Deepwater formations are often challenging because of various wellbore instabilities such as weak zones, abnormally pressured, and/or highly swelling zones that could trigger severe circulation losses, blowouts, wellbore sloughing, enlargement, and stuck...

... pressure needed for mud circulation in drilling operations, particularly when heavy mud is needed to drill deep formations to balance formation pressures. Well distribution of nanosilica particles in the mud disrupts excessive gel formation between gelling agents. This gel disruption reduces...

... string circulation pilot hole well fx-3 pipe incident hole opener hole section bottom hole assembly society of petroleum engineers upstream oil & gas caustic pill consideration hole cleaning Introduction Drilling long open hole sections could lead to many borehole stability...

... and geological features, formation evaluation challenges and observed drilling events to define twelve major subsurface events that were grouped into four GNPT categories. The categories are: (1) well flow, (2) lost circulation, (3) wellbore instability and (4) Subsurface evaluation. These events were tracked...

... W/O to recover the existing completion and run-in with a new design of ESP and accessories. During POOH the old completion after laying down the D-ESP packer on surface, the well kicked as a result of poor circulation during the killing operation. This resulted in a loss of control and fluid influx...

... Abstract Continuous circulation technology is a form of managed pressure drilling (MPD) where the constant circulation of drilling fluid is maintained by allowing the rig pumps to remain on while adding and removing stands of drillpipe. Using continuous circulation, many drilling challenges...

... conventional methods. Upstream Oil & Gas Well Design tolerance gas kick well control circulation mud weight fracture pressure Kick Simulator drilling operation realistic kick simulator simulator pressure gradient gradient minimum practice intensity annular pressure drilling...

...). This method maybe uneconomical or pose a well control risk since the kick margin may not reflect the actual well condition during fluid influx and subsequent circulation. A gas kick simulator is proposed in this work to aid the drilling engineer to make a good engineering decision during the well planning...

... characteristics, depleted reservoirs and many more. It is common to observe lost circulation during the drilling and cementing phases of a well spudded in permeable or unconsolidated reservoir environments. Various lost circulation prevention techniques can be deployed to minimize losses. These techniques include...

... with improved pendulum and steerable drilling assembly designs. Optimized BHA hydraulics and drilling parameters to improve hole cleaning and reduce lost circulation, high stand pipe pressures, washouts and bit balling. Acknowledgement The authors are grateful to the management of Seplat Petroleum...

...-consuming remedial cementing operations in the area. cement and bond evaluation casing and cementing drilling fluid management & disposal Wellbore Design circulation displacement zonal isolation drilling fluids and materials Upstream Oil & Gas Efficiency spacer spacer system cement...

... force to overcome the yield stress of the mud. To achieve effective zonal isolation, the cement spacer must remove both movable and immovable mud (that may have gelled up during static conditions) from the wellbore before cementing. To achieve this, the mud must be conditioned through circulation so...

... Abstract Significant and dangerous drilling problem is created when suddenly facing massive lost returns. Consequently, conventional means of controlling the well through circulation down the drill pipe and returning up the annulus becomes impossible. Due to their heterogeneous nature...

... Abstract One of the most time consuming and cost inflating events in drilling operations is loss of circulation. It has been globally estimated to cost the drilling industry more than $1billion annually in rig time, materials and other financial resources. Lost circulation is the total...

... was extremely tight, and losses were to be expected. In an attempt to offset this, a proprietary lost circulation spacer was pumped ahead of the CO2/H2S-resistant cement system to mitigate the potential for losses and control any additional induced losses while cementing. The spacer had the dual capability...

... operation with the industry so that drilling operational process can be improved and well cost reduced significantly. emergency scenario petrobras operation well location drilling operation deepwater drilling operation challenge mobilization spe 162959 drilling circulation pilot hole hole...