... 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...

... moderate to very high levels of permeability reduction, predominantly caused by the nature of the drilling mud-cakes and incomplete clean-up during drawdown. 15% HCl was successful in removing much of the operational fluid damage but was typically not forming wormholes. Including a solvent seemed to aid...

... to understand potential for mechanical degradation. Prior studies at BP focused on evaluation of GRE performance with 9% HCl: 1% HF under ambient boundary conditions of 77°F for 24 hours. These tests caused unacceptable levels of mechanical degradation to GRE and plans to execute stimulation treatments in GRE...

... 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...

..., polymer-free delayed HCl acid system as an alternative for gelled and emulsified acids for stimulation of high temperature carbonate reservoirs. Novel concept of acid retardation without emulsifying the acid in diesel or gelling with linear/cross-linked polymer was introduced and evaluated. Static...

... Abstract Hydrochloric acid (HCl) is the acid of choice for acidizing operations in most carbonate formations and is the base acid commonly paired with others such as hydrofluoric (HF) in most sandstone applications. However, high dissolving power, high corrosion rate, lack of penetration...

...-01) with 15% Hydrochloric acid (HCl) and 15% HCl containing commercial additives (15% HClA); measured at reservoir conditions using the Rotating Disk apparatus (RDA). The Ultra Series FF-01 is a newly developed organic acid by Earthborn Clean, a division of Earthborn Environment Technologies LP...

... providing a safe and convenient system for handling, due its low toxicity, fewer required additives and biodegradability. Numerous laboratory tests have measured and confirmed considerably less corrosion risk, across a wide range of conditions, when compared to conventional formulations based on both HCl...

... pressure of each of the acid systems. Two single-phase retarded acid concepts were evaluated. In wormhole experiments with Indiana limestone, the best single-phase retarded acid possesses lower pore volume to breakthrough (PVBT) than unmodified HCl across all injection rates. The PVBT are substantially...

... virgene field characterization geothermal well reservoir characterization HCl san jacinto stimulate geothermal well Cerro Prieto Mexico los humero Introduction In Mexico and Central America more than 90% of the geothermal resources are used to produce electrical energy. Up today (2013...

... wt% HCl), these systems will have slower fluid loss rates where the amounts of collected filtrate were found to be 14.6, 2.7, and 2.5 cm 3 for 1 wt% HCl, formate ester and acetate ester, respectively, after soaking time of 2 hours. drilling fluid chemistry drilling fluid formulation bottom...

... chemistry waterflooding remediation of hydrates chemical additive fresh water acid system gpt additive calcium sulfate stimulation paraffin remediation hydrate remediation hydrate inhibition scale inhibition hcl precipitation neutralization process precipitate spe 149997 seawater 30 acid...

... fluid formulation fluid dynamics precipitation scale remediation oilfield chemistry drilling fluid property acidizing upstream oil & gas hcl critical rate damage control damage mechanism stabilization kaolinite damage control hbf 4 injection acid stimulation precipitate fine...

... interactions between iron and the viscoelastic surfactant used. Therefore, this study was conduct to better understand interactions between iron and various types of viscoelastic surfactants. All tests were conducted on live acid that contained 20 wt% HCl, 4 to 6 vol% surfactant, and 0.3 vol% corrosion...

... was stimulated first with 15% HCl through coiled tubing and then with the viscoelastic diverting acid system bullheaded down the production tubing; production logs were acquired after each treatment. The results from comparison of pre- and post-job production logs clearly show a change in the production profile...

... Abstract This paper discusses the development of a unique in-situ crosslinkable acid system that uses a blend of HCl/formic acid as the base acid and a synthetic polymer gelling agent. The ability to in-situ crosslink an organic acid blend is novel. In addition, an unexpected result...

... logging strength treatment fluid Upstream Oil & Gas stimulation wormhole diversion loosely consolidated brazilian carbonate formation log analysis perforated interval quissama interval Macae Formation carbonate formation SDVA injection BOPD HCl acid acid stimulation resistivity...

... chemistry drilling fluid formulation injection rate fluid dynamics conductivity hcl limestone core drilling fluid selection and formulation drilling fluid property stimulation complex reservoir carbonate reservoir permeability apparatus diffusion coefficient international symposium upstream...

... of iron precipitation occurred at pH 0.6, and complete precipitation of iron occurred at pH 1. These values are lower than those noted with 15 wt% HCl. Values of pH at the onset and complete precipitation of iron were found to be a function of initial HF acid concentration. For the retarded HF acid based...

... Abstract Three different commercial formulations (Company A, B and C) of in-situ gelled acids for matrix acid stimulation were compared in carbonate coreflood experiments at a temperature of 100 °F (38 °C) and at acid concentrations of 5 wt% HCl. The in-situ gelled acids contained a polymer...