... Abstract Lower completion and acid stimulation design for low permeability chalk formations in a series of North Sea Fields were modified from historical/legacy approaches, to improve well performance for both production and injection purposes. The modifications include 1) a stimulation change...

... Abstract Single-phase retarded acid systems provide higher performance and operational efficiency benefits than systems based on unmodified HCl and emulsified acid. When combined with diverting fluid systems and modeling, they have proven to resolve many challenges operators experience...

... intervention geologist directional drilling drilling operation production enhancement mineral downhole intervention production monitoring recovery reservoir surveillance production control restimulation petroleum engineer production recovery effectiveness acid wellbore cleanout society...

... Abstract This study investigates the evolution of acid stimulation to remove the near wellbore damage in producers at Penglai Oilfield which is the largest offshore oilfield in China. The near-wellbore plugging has been observed in certain wells within the unconsolidated sandstone reservoir. So...

... Abstract This paper describes a case study of an acid stimulation performed in the Shenzi field, deep water Gulf of Mexico; the candidate well was an oil producer with a cased hole frac pack completion. Despite having low skin values from the initial completion, the well started to build skin...

... conductivity path between the well and reservoir without causing damage to either the reservoir or completions. Depending on the reservoir, acid or proppants are selected such that fracture conductivity is maintained through most of well life. Many examples are provided in this paper. completion...

... lining is typically used as a coating on production tubulars in oil wells to protect metallurgy of tubulars from corrosive environments, thereby extending the life of tubulars and realizing cost savings. GRE lining is chemically compatible with many acids used in well stimulation to restore productivity...

... of life status. 2019 had the largest increase in acid stimulation treatments ever in the Deepwater Gulf of Mexico. This study focused on identifying a HF acid derivative treatment that could be used as a single-step sandstone acid treatment, with all the associated benefits, but would not require acid...

... Abstract Sandstone acidizing operations usually include solvent and acid preflush, main acid treatment, and post-flush stages. However, the acid preflush stage needs good design and execution to prevent formation damage. Moreover, multiple-stage operations require large-volume fluids...

... that parameters such as the additive-dose, pH, and a catalyst affect the dissolution efficiency. The dissolution performance efficiency of each additive (Lactic Acid, Citric Acid, N,N-Dicarboxymethyl Glutamic Acid (GLDA), and Gluconic Acid) was compared to the additive performance efficiency under a catalyzed...

... Abstract Novel retarded acids were designed and evaluated by measuring their dissolution and corrosion rates in the laboratory at a temperature of 250°F. Results indicate that depending on the type of the retarder, the acid solutions containing 15 wt% HCl react 1.2–10.7 slower than 15 wt...

... Abstract An operator in Mexico was seeking a solution for improving methods for acid stimulation treatment in open-hole wells. Previous bullheading acid treatment in the same field was less efficient compared with selective treatment according to production conditions. In the shallow waters...

... Abstract Retarded acid systems are highly sought out to allow for deep penetration of acid to improve the efficiency of acid stimulation treatments. This is important in high temperature carbonate reservoirs or in long intervals that shift injection rates away from optimum, causing near...

.... acid stimulation) is very limited and mostly unfeasible. In this paper, an efficient chemical treatment is proposed to stimulate tight dolomite formation through wormholing mechanism and scale-based damage removal. The formation damage in tight reservoirs are much more severe due to the smaller pore...

... Abstract Fields in offshore Mexico present different challenges to maximizing resource recovery due to the reservoir characteristics and completion configurations. Acidizing of high temperature (HT) dolomitic reservoirs (290 °F/143 °C) in the maritime fields represents the primary stimulation...

... mineralogy to form reservoir rock plating, do not partition, and do not disintegrate over time. These tracers are injected in the liquid-laden slurry at very low concentrations and can be detected at parts per trillion. chemical tracer tracer test analysis injected fluid us government acid...

... Abstract Most wells in carbonate reservoirs are stimulated. Due to low cost and simpler operations, acid stimulation methods are usually preferred if they are sufficient. Matrix acidizing can effectively stimulate carbonate reservoirs, often resulting in skin factors on the order of -3 to -4...

... Abstract The development of well completion strategy at the subject field has evolved from simple vertical completions to extended horizontal wells with selective openhole completions (Etuhoko et al. 2014). Normally, well completions in this field involve large volume acidizing treatments...

... Abstract The Danish North Sea Halfdan Field is developed with extremely long horizontal wells in a line drive producer/injector pattern. The carbonate reservoir requires successful acid stimulation to maximize the flow potential of the wells. High rate, matrix acidizing, relying on maximum...

... equation wellbore emulsifier corrosion inhibitor acid surfactant reservoir agent asphaltene onset pressure equation intervención de pozos petroleros flow assurance formation damage production control well performance completion installation and operations flow in porous media enhanced...