... Abstract A series of long-term coreflood tests has shown the importance of considering the self-breaking rate of biopolymers when designing coreflood tests of low-solids and solids-free brine-based drilling and completion fluids that naturally contaminate the core plug with biopolymers during...

.../workover fluids. XRD/XRF were used to determine the composition of the core plug samples. CT scan was utilized to assess the effect of workover fluids, workover brines, and acid recipe on fluid invasion profile. The mudloop system was exploited to expose core plugs to workover fluids and assess...

... techniques provide solutions to such issues and can range from using mechanical restrictions that redirect the fluid flow, up to the use of specially designed particles placed in the flow stream to divert the treatment. Mechanical methods can include packers, bridge plugs and sand plugs which are used...

... dissolution acid plug hcl acid Introduction A recurrent focus of fluid development in the arena of acidizing is the appropriate and efficient use of the reactive fluid in a myriad of situations and conditions in which the oilfield industry operates. For instance, in high-pressure/high-temperature...

... the flowback processes after hydraulic fracturing operations. We perform a series of core flooding tests on core plugs collected from Midale tight carbonate reservoir to simulate fracturing fluid leak-off and flowback processes. First, we clean, saturate the plugs with reservoir brine and filtered oil...

... Abstract The design of lost circulation remediation strategies is complicated in naturally fractured reservoirs. It has been a great challenge for engineers to balance between fracture plugging and formation damage. In this study, experimental investigations and statistical analysis were...

... environmentally friendly epoxy formulation category plug epoxy formulation biodegradability hydraulic fracturing resin viscosity epoxy Upstream Oil & Gas society of petroleum engineers environmentally friendly epoxy aquatic environment hazardous chemical toxicity environmental property...

... core flood test data to see how quickly the simulated well clean-up procedures restored original permeability in tight gas-bearing sandstone cores after exposure to high-density cesium formate fluids for at least 48 hours under HPHT conditions. Plugs of gas-bearing low permeability (2-20 mD) sandstone...

..., whereby frac-treatments are optimized to enhance productivity. flow laboratory apparatus flow laboratory study Completion Installation and Operations energetic material propellant Upstream Oil & Gas stimulation plug productivity Well Stimulation wellbore gram propellant case micro-ct...

.... Salinity also helps disaggregate the diverter, facilitating its removal from the well. Completion Installation and Operations Brine differential diverter formulation tunnel Upstream Oil & Gas pressure differential plug diverter perforation tunnel diverter plug perforation diverter...

...-permeability sandstone core plugs obtained from the productive Ness reservoir formation in the Huldra field were subjected to static and dynamic exposure to heavy formate drill-in fluids under HPHT reservoir conditions at 350 psi overbalance for a period of 296 hours. The cores were then exposed to short...

..., the rheology modifier can be used to create a temporary plug that gradually self-breaks at a controllable rate. Low-residue and salt-tolerant hydroxyethyl cellulose (HEC) solution can be crosslinked into a viscous gel and used as a temporary gel plug. By including the rheology modifier at selected...

... are unreliable—if not impossible—in these ultralow-permeability unconventional rocks. We present a method to measure the gas permeability on core plugs of mudstones at reservoir conditions, both before and periodically after the plug was exposed to fracture fluid. The change in gas permeability over time allows...

... cores were available in well ‘X’; unfortunately none was from sandstone producing interval. As an analogy two core plugs from nearby well were sent for XRD analysis & core flow test was performed with specially designed organic clay acid for high temperature reservoirs (OCA-HT). Based on encouraging...

... deliverability. drilling fluid property constant rate fluid loss drilling fluids and materials Brine formation damage plug Laboratory Evaluation drilling fluid selection and formulation Upstream Oil & Gas gas reservoir liftoff pressure drilling fluid chemistry gas permeability...

... °API gravities. Experiments included acid flooding of core plugs that were saturated with different °API gravities. The extreme case included flooding the acid through tarsaturated plugs. The wormholes were characterized by CT Scanning. Differential pressures, number and sizes of wormholes...

... Abstract Conditions leading to plugging of fractures and slots by particles of different size, shape, composition and concentration are investigated experimentally. Empirical correlations are developed on the basis of relevant dimensionless numbers which determine the effect of aspect ratio...

... hydraulic fracturing coiled tubing diversion method diversion technique tgs advisor upstream oil & gas completion installation and operations tgs reservoir plug packer gas reservoir diversion technology recovery efficiency complex reservoir advisory system fracture treatment decision...

... return permeability test plug upstream oil & gas annular pressure drilling Introduction It has been well recognized that during drilling with conventional fluids, because of positive differential pressure, significant damage to the original permeability may be induced by the invasion...

.... Results from the study indicate that very high levels of formation damage are caused when natural fractures get plugged and/or closed-over by mud filter-cake and lost circulation material (LNM) solids. Fluid pressure drawdown in the near-wellbore region and induced fracture closure pressures can...