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Keywords: acid
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Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174169-MS
..., which, with time and temperature, degrade into organic acids. The VDPM reduces the effective permeability to the water-based fluids, and the sized particles create an impermeable filter cake. When the particles degrade, the organic acid acts to break any remaining polymer. The system can either...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174242-MS
... Abstract This paper introduces a new retarded stimulation system which is based upon an environmentally friendly, biodegradable acid and highlights its first field trial in a sandstone/granite formation. Here, demanding borehole conditions (165°C, anhydrite and carbonate scales, highly...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174264-MS
... Abstract An existing limitation of chelant-based fluids available for sandstone acidizing with hydrofluoric acid (HF) is the presence of sodium in the concentrate of the aminopolycarboxylate fluid, which is common in all chelating agents soluble below pH 3.5. The presence of sodium complicates...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165084-MS
... from sandstone formations. Though research has been done regarding the organic-acid/carbonates system ( Buijse et al. 2004 ; Chang et al 2008 ). Very little research has been performed to remove the carbonates in sandstone reservoirs. Mahmoud et al. 2011 evaluated three chelate agents...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165089-MS
... Proper diversion technique is required in order to direct the treatment fluid to lower-permeability or more damaged zones and ensure the treatment of the entire production interval. Several materials and methods have been applied to enhance acid diversion across the treated interval. Each...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165147-MS
... Abstract Sandstone acid systems, which are composed of HCl and HF, are commonly used to remove the formation damage in sandstone reservoirs. However, to perform any treatment using these acid systems, a preflush and/or a postflush of HCl plain acid must be injected to eliminate CaF 2...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165153-MS
... Abstract Chelating agents are used in the oil and gas industry mainly to: remove inorganic scales, control iron during acid treatments, and stimulate carbonate/sandstone reservoirs. The main chelating agents used in the field, include: ethylenediaminetetraacetic acid (EDTA), N-(hydroxyethyl...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165141-MS
... treatments in terms of reduction in breakdown pressure and subsequent treating pressures ( Hardesty et al. 2011a ; 2011b ). For matrix acidizing it has generally been assumed that deep perforations are appropriate and that the stimulation will offset any impact of perforation damage (i.e. the acid...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165169-MS
... scale inhibition emulsion saturation pressure production control Reservoir Surveillance Production Chemistry Upstream Oil & Gas spe 165169 acid injector well Well Productivity xylene-hcl blend SPE Case History perforation formation damage productivity well 9 society of petroleum...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165143-MS
... of little or too much acid volumes across the damaged zones that could lead to poor coverage or over-dose with attendant incomplete damage removal or secondary precipitates respectively. Funds spent on stimulating horizontal wells estimated at average of USD 0.5mln/well did not yield the expected rewards...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165181-MS
... drilling fluid chemistry drilling fluid formulation ilmenite water-based filter cake drilling fluids and materials concentration drilling fluid property HCl chemical reaction ilmenite titanium removal efficiency ilmenite particle acid remove ilmenite water-based filter cake...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165199-MS
... Hydrochloric acid (HCl) is the most commonly used chemical to remove iron sulfide scales. Its effectiveness will be related to the crystalline structures of the iron sulfide scales to be removed. Iron sulfides of different crystalline structures have different solubility in the mineral acids...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-142033-MS
... Abstract The KKY in Tarim oilfield, Western China, is a typical HTHP deep dolomite reservoir (150C, 110Mpa and 6000m). The formation was deeply damaged with the heavy mud, and the matrix acidizing can't effectively eliminate the skin. But the acid fracturing treatment can't be carried because...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-143643-MS
... Woo et al. (1999) stated that there is a need for proper fluid diversion to enhance the outcome of matrix acid treatments. One way to enhance diversion is to increase the viscosity of the acid. Therefore, in-situ gelled systems had been proposed and successfully used for viscous acid diversion...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144051-MS
... in Eq. 1 : (1) V 2 2 + p ρ = C where, V = fluid velocity P = pressure Abstract Acid stimulation for damage removal is performed when a well is expected to produce satisfactorily when the skin is approximately equal to one. Blindly flowing acid...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144007-MS
..., understanding damage mechanism and type is critical for fluid selection and effective treatment design. Without this knowledge, the conducted stimulation treatment could cause a more severe form of formation damage. This report discusses the improper use of mud acid at (9 wt% HCl/1 wt% HF) in restoring...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144148-MS
... of studies were conducted to develop the favorable IOR techniques including advanced emulsion acidizing stimulation, microbial enhanced oil recovery methods, artificial water buffer, directional drilling application, and gel treatment for basement reservoir. These special approaches were achieved many...

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