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Acid fracturing

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Proceedings Papers

Paper presented at the SPE Asia Pacific Oil & Gas Conference and Exhibition, October 25–27, 2016
Paper Number: SPE-182384-MS
... Abstract Recently, different stimulation techniques, including diverting acid fracturing, proppant fracturing and non-acid stimulation, were tested in Keshen 8 gas reservoir in Kuqa Gasfield of Tarim Oilfield. By comparing the production after stimulation, it is found that acid fracturing...
Proceedings Papers

Paper presented at the SPE International Hydraulic Fracturing Technology Conference and Exhibition, October 16–18, 2018
Paper Number: SPE-191440-18IHFT-MS
... Acid was injected at injection rates shown in Table 1 , using 15 wt% and 28 wt% HCl. Field injection rates were obtained by assuming a fracture geometry of 0.5 in. aperture and 10 ft height, then multiplying the injection velocity with the injection area of the fracture to obtain the field...
Journal Articles
Journal: SPE Journal
SPE J. 26 (02): 639–652.
Paper Number: SPE-200406-PA
Published: 14 April 2021
...Jiahui You; Kyung Jae Lee Summary Hydrochloric acid (HCl) is commonly used in acid fracturing. Given that the interaction between acid and rock affects multiphase flow behaviors, it is important to thoroughly understand the relevant phenomena. The Darcy-Brinkman-Stokes (DBS) method is most...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201465-MS
... Abstract In acid fracturing treatments, the goal is to create enough fracture roughness through differential acid etching on fracture walls such that the acid fracture can keep open and sustain a high enough acid fracture conductivity under the closure stress. The viscous fingering phenomenon...
Journal Articles
Journal: SPE Journal
SPE J. 25 (05): 2296–2318.
Paper Number: SPE-199236-PA
Published: 15 October 2020
... stimulate carbonate reservoirs, often resulting in skin factors on the order of −3 to −4. In low confining stress and hard rocks, acid fracturing can yield better results than matrix acidizing. However, acid fracturing is less effective in high permeability, high confining stress, or soft rocks...
Proceedings Papers

Paper presented at the SPE Improved Oil Recovery Conference, August 31–September 4, 2020
Paper Number: SPE-200406-MS
... Abstract Hydrochloric acid is commonly used in acid fracturing. Given that the interaction between acid and rock affects multiphase flow behaviors, it’s important to thoroughly understand the relevant phenomena. Darcy–Brinkman–Stokes (DBS) method is most effective to describe the matrix...
Journal Articles
Journal: SPE Journal
SPE J. 4 (04): 360–367.
Paper Number: SPE-58356-PA
Published: 01 December 1999
...Brigitte Bazin; Claude Roque; G.A. Chauveteau; M.J. Bouteca Summary During the acid-fracturing process, part of the fluid enters the formation, dissolving the rock and creating channels, named wormholes which enhance considerably the volume of fluid leakoff and acid consumption into the formation...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 19–21, 2020
Paper Number: SPE-199236-MS
.... In low confining stress and hard rocks, acid fracturing can yield better results than matrix acidizing. However, acid fracturing is less effective in high permeability, high confining stress, or soft rocks. There is a combination of parameters, among them permeability, confining stress, and rock...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1260
... ABSTRACT: The geometry and variation of hydraulic fracture during acid fracturing are of great significance to verify the acid fracturing model and to guide the acid fracturing design. In this paper, artificial specimens of 300mm*300mm*300mm for acid fracturing are made of 50% cement and 50...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 7–9, 2018
Paper Number: SPE-189559-MS
... Abstract The use of conventional acid systems in high-temperature, fast-reactive carbonate reservoirs limits the effectiveness of matrix acidizing and acid fracturing. Therefore, during acid stimulation in such conditions, acids with retarded reaction are usually recommended. Industry-employed...
Proceedings Papers

Paper presented at the SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, October 17–19, 2017
Paper Number: SPE-187019-MS
... Abstract While flowing in the fracture, acid may leak off through the wormholes and appear a finger-like pattern during the process of acid fracturing, which is commonly called "acid fingering". Acid fingering is an unsteady hydrodynamic phenomenon that happens when low viscous acid...
Journal Articles
SPE Prod & Oper 32 (01): 51–63.
Paper Number: SPE-173390-PA
Published: 13 April 2016
..., dilute acids can be used while fracturing to maintain the conductivity of these microfractures under closure stress by nonuniformly etching the fracture surfaces. The mineralogy and pore structure of the shale and their evolution during acid fracturing are critical factors on the surface-etching profile...
Proceedings Papers

Paper presented at the SPE Hydraulic Fracturing Technology Conference, February 3–5, 2015
Paper Number: SPE-173390-MS
... Abstract Many microfractures created during hydraulic fracturing are too small to be filled with proppants and are likely closed during production. However, for some shales that are rich in calcite (calcareous mudstones), such as the Bakken and Eagle Ford shale, dilute acids can be used while...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2013
Paper Number: IPTC-16720-MS
... Abstract Leakoff has been regarded as the main factor that limits fracture propagation and live acid penetration distance in acid fracturing. Reducing acid leakoff is a common measure to increase effective fracture length. Due to cleanness and leakoff reduction, clean self-diversion acid (VES...
Proceedings Papers

Paper presented at the SPE Hydraulic Fracturing Technology Conference, February 6–8, 2012
Paper Number: SPE-152179-MS
... What defines an acid fracture? Three similar definitions can be be used as reference, spaced in time: - Novotny in 1977, stated that "acid fracturing is a technique commonly used to stimulate carbonate reservoirs. Reactive fluid, usually acid, is injected into a well when induced fracture...
Proceedings Papers

Paper presented at the SPE Middle East Oil and Gas Show and Conference, September 25–28, 2011
Paper Number: SPE-141339-MS
... at the beginning of the gas development program were vertical completions, the majority of which were acid fractured and achieved excellent post-stimulation results. As the development scope expanded to areas with tighter reservoir characteristics, the majority of new wells were drilled as open hole single or dual...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-141337-MS
... Abstract Acid fracturing has been extensively used as a well proven method to stimulate carbonate formations in the Ghawar field. The unique reservoir characteristics found in all the wells producing from carbonate reservoirs in the field make acid fracturing stimulation operations highly...
Proceedings Papers

Paper presented at the SPE Oil and Gas India Conference and Exhibition, January 20–22, 2010
Paper Number: SPE-127339-MS
... Abstract The primary objective of acid fracturing is to generate a conductive flow path between wellbore and reservoir. The factors that governed the effectiveness of acid fracturing treatments are etched fracture penetration and its conductivity. The effective fracture length and its...
Journal Articles
SPE Prod & Oper 24 (02): 320–335.
Paper Number: SPE-110895-PA
Published: 30 April 2009
...Hisham A. Nasr-El-Din; Ali A. Al-Zahrani; Francisco O. Garzon; C.A. Franco Giraldo; Ibrahim M. Al-Hakami; Hamad M. Al-Marri Summary Acid-fracturing treatments are used commonly to enhance the productivity of carbonate formations with low-permeability zones. Various forms of hydrochloric acid (HCL...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, November 11–14, 2007
Paper Number: SPE-110895-MS
... acidizing solid bead organic acid Upstream Oil & Gas gas well acid Exhibition application hydraulic fracturing concentration field application flowback well flowback sample wellbore flowback sample lactic acid Flowback Time reaction fracture ion concentration calcium...

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