... instability in the low casing head pressure wells, producing a flower-like pattern in the RTMS monitoring of the continuous gas lift wells. Hydrodynamic slugging can induce the dynamic well loading. Analysis also indicated the possibility of density wave oscillation-type dynamic instability due to flowline...

... pressure measurement pressure testing instability fractured reservoir acquisition drilling formation pressure testing fluid loss formation pressure data Introduction Formation pressure testing in naturally fractured reservoirs is a critical process in reservoir characterization...

... The low permeability reservoir has the characteristics of large buried depth, high temperature, large lithologic change and high stress field, which leads to the inaccurate drilling mud density window based on the conventional wellbore stability analysis, resulting infrequent instability of the wellbore...

... reduction drilling fluid property drilling fluid selection and formulation reservoir characterization cutter international petroleum technology conference rock type wellbore integrity efficiency drilling fluid chemistry instability carbonate rock drilling operation bit design bit selection...

...Introduction Abstract The strength deterioration of the wellbore rock induced by water-rock interactions would be an important cause of the delayed instability in the Leikoupo formation located in Western Sichuan Basin, Sichuan Province, China. Taking the carbonate rock sample obtained from...

... (1) U C S 1 = 0.0548 Y s 0.8457 In the initial simulation step, the logging data is used to identify instabilities in the caliper log and make necessary corrections. The parameters associated with determining the maximum and minimum horizontal stresses, overburden stress...

... Conventional WBMs interact with reactive clays leading to shale instability issues during drilling. The NPA addresses this by inhibiting shale through several mechanisms: Cationic sites on the NPA actively exchange with cations on clay surfaces, binding to the negative charges. This coats...

... drilling experiences, poor ROP, mechanical instability, and differential sticking against some of the highly porous and permeable carbonate reservoirs were identified as the main drilling challenges impacting delivery for the 8-1/2" and 6-1/8" sections parallel to the regional minimum horizontal stress...

... increases the risk during drilling operations. <italic>Geological Faults and Wellbore Instability</italic> In the Gulf of Mexico region, the fault system is a reflection of former tectonic movements. Stuck pipe risk is present due to instability when crossing the geological faults affected area...

... for 8-inch pipelines for each of the typical profiles. In addition, rates that resulted in flow instability, i.e., UL = 0 at a segment in the pipelines, were reported. To evaluate the impact of the different fluid on the flow behavior, rates corresponding to the same flow parameters were obtained...

... window for mud weight, thereby optimizing the mud weight program, casing placement depths, geomechanical prognostications, and engineering designs. Wellbore instability stemming from rock failure can be ascribed to two primary modes, namely tensile failure and shear failure. Shear failure is typically...

..., and the higher the degree of shale strength weakening is, the worse the mechanical stability is and the higher the risk of well wall instability. External fluids are prone to intrude along the bedding and promote shale hydration, making the shale mechanically less stable and reducing the well wall's stability...

... Wellbore instability is a common challenge encountered during drilling operations, and one of the potential consequences is a stuck pipe. A stuck pipe refers to a situation where the drill string gets immobilized and cannot be pulled out of the wellbore. This can result in costly delays...

... mechanical differential model instability real-time detection international petroleum technology conference dataset iptc-24078-ms Introduction Downhole problems vary from borehole instabilities, hole deviations, loss circulation, wellbore failures, shale instability, bad hole cleaning...

..., hole cleaning, and well control. Abstract The problem of wellbore instability is a worldwide technical problem in the field of the drilling engineering and one of the core problems for the safe and efficient drilling. After the drill bit drills the formation and a borehole is formed, the drilling...

... challenge with drilling through the losses, followed by formation instability, which resulted in stuck incidents. CwD strategy divided into two elements – remedial and optimization. For remedial element, offset analysis required to determine the level of formation instability surrounding the subject well...

...). A drilling fluid that has performance like oil-based drilling fluids and environmental acceptance of water-based drilling fluids is the need of the times. In the whole Gulf region, wellbore instability is a major cause of nonproductive time. Drilling time-dependent shale formations have always been...

.... Examining the cavings to interpret wellbore instability and mechanisms responsible for it is an expert's job and requires a good overall understanding of the prevailing geology, geomechanical principles, drilling procedure, and drilling tools. Identification of wellbore failure during drilling provides...

... Abstract Drilling horizontal wells in YB gas field in Ordos Basin presents significant challenges due to severe wellbore instabilities problems in drilling through Permian Lower Shihezi and Upper Shanxi formations, where laminated shales overlies with sand and coal seam. In first phase...

... asphaltene (and viscosity) gradients. Continued asphaltene instability can yield tar mat or local asphaltene deposition. The Flory-Huggins-Zuo Equation of State (FHZ EoS) is best used in conjunction with Downhole Fluid Analysis (DFA) to delineate these asphaltene gradients. This thermodynamic analysis...