... Lost circulation—by raising the mud weight to control the formation pressure at the bit, the formation may rupture. The mud will then run out into a cavity of its own making. (Ref AAPG Methods in Exploration series-10) When drilling in areas where over-pressured zones are known to occur...

... Regarding lost circulation, discussions often emphasize mitigation measures rather than prevention ( SPE, 2020 ). Existing literature covers the mitigation of lost circulation, with currently available products capable of sealing apertures up to 1 cm. Preventing lost circulation primarily...

... capabilities. This alteration in mud rheology poses challenges in maintaining effective hole-cleaning tendencies. Proposed Drilling Design Abstract Challenging formations offer most of the evident drilling problems including lost circulation and stuck pipe events that result in financial and timeline...

...] , they analyzed the gas influx migration law under different water depths and depths below mud line, it has more time-dependent advantages than the conventional mud pool level monitoring method. Li Bin et al. Investigated the complex situation of lost circulation in drilled wells [2] ,they analyzed the current...

... solution for loss circulation. The standard two casing string design for Fairview Early Permian is shown in Fig. 2 . (Shaban et al. 2018) . Mitigation Plan A low-solids, highly thixotropic(LHST) cement system was developed to abate these losses due to the following key advantages: Proven...

... The packer element cannot be prematurely set by applying internal pressure while circulating the first stage cement. A freefall opening cone or pumpdown-opening plug must first land on the tool's opening seat and shift the inner sleeve to initiate inflation. A special-purpose gauge ring...

... wells include well control incidents, lost circulation, formation breathing, differential sticking, reduced rates of penetration, and reservoir damage, many which can potentially lead to expensive sidetracks, well abandonments and underground blowouts. A better understanding of the prevalent pore...

... pipe case. To ensure adequate hole cleaning during the coring operation in a PETRONAS Carigali Sdn Bhd (PCSB) deepwater well, a new multi-cycle circulating sub, Intelligent Circulating while Drilling (iCWD) was utilized. iCWD was developed primarily to perform losses treatment, isolate hole sections...

... circulation, and minimizing formation damage. Second, the large casing-to-wellbore diameter ratio created a gauged well, the smoother, more circular profile contributing to better well stability and requiring less cement. Third, a small, mono-bore annulus (between wellbore and casing) and consequent higher...

... to be a challenging process. Lost circulation while drilling and cementing continues to be a consistent problem in most deepwater operations that costs significant time and money. Firstly, the operator is faced with the inability to reach planned total well depth within the projected time interval, and secondly...

...) and the Pumped Riser System. Further, to both compliment and supplement the above systems, a number of recent technology advancements are described. For example:- Early & Deep Water Kick Detection (EKD & DKD), Riser Gas Handling (RGH), Continuous Circulation System (CCS), Downhole Shut-Off Valves (DSVs...

... Willis , A. J. and Wynne , R. A. 1959 . Combating Lost Circulation While Cementing in the Mid-Continent . Paper API 59–190 presented at Drilling and Production Practice Ivan , C. , Bruton , J. , and Bloys , B. 2003 . Lost Circulation Can Be Managed Better...

... and preparation. One of main technical challenges was overcoming the risk of lost circulation. The top-hole operation required the dual 30 13-3/8 casing with both annuli being cemented in single operation and achieving cement returns to seabed. For operation integrity, a project support model has been set up...

... Abstract Offshore drilling projects are inherently more challenging to execute due to the increased risks and complexity associated with extreme working condition and unpredictable drilling formation pressure margins. Since the time we have begun to drill with mud circulating in the hole...

... to wellbore pressure occur when mud pumps are cycled off and on during connections, causing fluctuations in equivalent circulation densities (ECD) and downhole pressure and temperature spikes. These conditions can result in expensive downtime, safety issues, and the inability to drill a well within extreme...

... equipement is used to run the casing into predrilled holes using rotation and circulation. 2 Non-Retrievable Casing Drilling Simple non retrievable BHA used in vertical or tangent sections without the need for active directional control. 3 Retrievable Casing Drilling Steerable BHA for directional drilling...

... Water Circulation (HWC) and EHTF in bundle. A general presentation of these systems is given, including design, fabrication and installation methods, as well as the maturity of the technology. Typical field architecture is proposed to illustrate the benefits of each active heating technology in terms...

... be reduced or totally eliminated. The technology also in many cases allows setting of the 20" casing deeper, eliminating an extra liner across problem zones. A spin-off technology is Managed Pressure Cementing - MPC; Once the first surface casing is landed and circulation of cement starts, the subsea mud...

... continuously while maintaining circulation. The CMR technology facilitates Underbalanced Drilling, MPD, and full snubbing capabilities. CMR will be the first fully robotize drilling process. This paper will present the CMR technology, the development status and that the CMR Technology is a valuable...

... depth active heating technology cable bundle efficiency power requirement flowline pipeline circulation upstream oil & gas preservation application technip requirement heating OTC-24711-MS Technical and Economical Comparison of Subsea Active Heating Technologies Bruno Ansart...