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Keywords: acidizing
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Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174203-MS
... Abstract Over the years, sandstone acidizing has experienced low success rate. This makes it essential to develop a systematic method for selecting the optimum hydrofluoric acid (HF) concentration, which can achieve the highest possible permeability enhancement. Field experience...
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-174270-MS
... Abstract The aim of this paper is to describe a methodology to simulate scale squeeze treatments in acid stimulated carbonate reservoir. Acid stimulation treatments refer to matrix acidizing, which aims to improve productivity in tight carbonate reservoirs. They generally show a high porosity...
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 and Exhibition, June 3–5, 2015
Paper Number: SPE-174167-MS
... required to penetrate into the formation to create a wormhole—a function of reactive fluid used, injection rate, and temperature—the more efficient the treatment. Hydrochloric acid (HCl) has both a high dissolution rate and dissolution capacity which, at high temperature, results in dissolution of the face...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174198-MS
... Abstract Success in matrix acid stimulation of carbonate formations depends largely on the acid distribution and the created wormhole length. Treatment design is still as much art as science, especially where field experience is used to quantify the design parameters for candidate wells...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174241-MS
... Abstract Diffusion Coefficient ( D e ) is a very important parameter for the formation damage treatment job design. Commonly a Rotating Disk Apparatus (RDA) is used to obtain acid D e and reaction rate. There are two major limitations of conventional lab practices (1) The D e...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174279-MS
... of remedial treatment in restoring the original permeability. Experimental results revealed partial removal of the polymer invading the core using organic acid. The designed pre-flush composed of mutual solvent with surfactant package was effective in breaking the emulsion from field samples and laboratory...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165120-MS
... al. (2011) discussed the use of a chelating agent, L-glutamic acid, N,N –diacetic acid (GLDA). They compared the GLDA chelating agent to the old chelating agents like EDTA, HEDTA, NTA and EDG. GLDA showed better solubility in HCl over a wide range of pH and GLDA was effective in dissolving...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165149-MS
... Abstract Viscoelastic surfactant (VES)-based acid systems have been used successfully in matrix and acid fracturing treatments. However, the existence of Fe (III) as a contaminant in such systems may lead to many problems, due to interactions between VES and Fe (III). Such interactions could...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165153-MS
... as introduced into the solution ( Martell et al. 1975 ). EDTA started to decompose at 500°F after 30 minutes because of hydrogen bridging into iminodiacetic acid (IDA) and 2-hydroxyethyliminodiacetic acid (HEIDA). However, Motekaitis et al. illustrated the split of EDTA molecules to HEIDA and IDA via...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165142-MS
... The fluid employed in this test consisted of 2.2% HF acid with a 0.6 M APCA and 5% of quaternary ammonium reagent; the fluid pH was 2.8. A backpressure of 800 psi was applied, and confining pressure was 2,000 psi. The brine employed was 5% NH 4 Cl. The PV was 110 mL, and the core...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165203-MS
... Some iron compounds are soluble, others are insoluble in acid solutions, but even the soluble compounds precipitate when the acids are spent ( Dill and Fredette 1983 ). Iron has two forms: ferric and ferrous ions. Ferric ions start to precipitate at pH of 1 ( Taylor et al. 1999b ), luckily...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165189-MS
... Formation damage occurs during acidizing or chemical treatments due to the presence of contaminants in the tubing. The main contaminants presented in a typical well tubing are mill scale, iron sulfides, pipe dope, sand and other fine particles that were picked up during storage and transportation...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165089-MS
... and placement of the optimal stimulation fluid are crucial to maximize well production after treatment and consequently increase reservoir recovery. Matrix acidizing is frequently used to stimulate carbonate reservoirs offshore Brazil. In matrix treatments the acid is injected into the formation below...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165100-MS
... ) − 2 3 ∇ ⋅ u l ] where is the molecular viscosity and I is the unit tensor. Since the wellbore is initially completed with an inert fluid, the transport of the acid specie is described through a conservation equation of chemical species, which general form is given...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165084-MS
...) . Kaolinite has a two-layer structure and a small Base Exchange capacity; it is basically non-swelling clay but will easily disperse and move. Chlorite is susceptible to damage from acid stimulation procedures, and will generate ferric ion in the presence of HCl ( Almon and Davies, 1981 ). An iron...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165092-MS
... and also to find the best solution to prevent or remove damage. Nature of damage has been investigated trying to identify how much is water blocking and can how much is mechanical damage and can be removed only by acidizing. Based on XRD investigation a mud acid recipe was formulated and tested...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165121-MS
... the traces present very smooth and gradual slope changes along the perforated liner. This is also confirmed by tracking the temperature features created by the variation of pump rate at surface. real time system acidizing open-hole section information Completion Installation and Operations drilling...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165166-MS
... for those tests involving, parallel-flow, dual- or multi-cell tests, or carbonate matrix acidizing optimization studies. flow in porous media wormhole penetration fluid displacement wormhole acidizing spe 165166 viscosity Upstream Oil & Gas wormhole trajectory Permeameter fluid viscosity...

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