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Acid placement and coverage

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Proceedings Papers

Paper presented at the SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, October 12–14, 2021
Paper Number: SPE-205599-MS
... reservoirs are characterized by thick pay layers and significant porosity and permeability variations. For Field X, diverting acids were considered for zonal coverage because of their easiness in preparation and placement and cost efficiency and availability. HCl-based PGA was applied because of its...
Journal Articles
SPE Prod & Oper 15 (03): 208–213.
Paper Number: SPE-65355-PA
Published: 01 August 2000
..., from the point of view of acid placement and acid penetration in low permeability or high skin sections, plain HCl is not always a good choice. The low viscosity of plain HCl acid (about equal to water) often results in poor wellbore coverage unless highly effective diversion methods are used to ensure...
Proceedings Papers

Paper presented at the European Formation Damage Conference, May 30–June 1, 2007
Paper Number: SPE-107780-MS
... and to overcome formation damage effects, or to create acid fractures or deep matrix stimulation to enhance productivity. Good acid coverage with a relatively small acid volume is required to economically obtain the desired broad reservoir access. We have developed a model to predict the placement of injected...
Proceedings Papers

Paper presented at the IADC/SPE Asia Pacific Drilling Technology Conference, June 8–9, 2021
Paper Number: SPE-201054-MS
..., and the final distribution of perforations selected along the drain. A fluid placement simulator indicated low sealing efficiency of the ball sealers would lead to an overstimulation of the highest permeability areas. Subsequent simulations indicated that the DPS would provide better acid coverage with lower...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, November 15–17, 2011
Paper Number: IPTC-15118-MS
... in Carbonate Rocks under Radial Flow Conditions. SPE 107854. 2007. Tardy, P.M.J. 2009. Method for Predicting Acid Placement in Carbonate Reservoirs. 7,603,261 US, 10 13, 2009. Tardy, P.M.J, et al. 2011. Inversion of DTS Logs to Measure Zonal Coverage During and After Wellbore Treatments with Coiled Tubing. SPE...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 6–9, 2015
Paper Number: IPTC-18360-MS
... . Mikhailov , M. I. , Acid Placement and Coverage in the Acid Jetting Process . MS Thesis. Texas A&M University , College Station, TX , 2007 . Rees , M. J. , A. Khallad , A. Cheng , K. A. Rispler , J. B. Surjaatmadja , and B. W. McDaniel , Successful Hydrajet...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 26–29, 2020
Paper Number: SPE-201390-MS
... Abstract Hydrocarbon production enhancement by means of acid stimulation in Kazakhstan requires application of a more effective approach to address challenges associated with acid placement and reservoir contact in long pay zones of high-temperature carbonate reservoirs, thereby improving...
Proceedings Papers

Paper presented at the SPE Russian Oil and Gas Technical Conference and Exhibition, October 3–6, 2006
Paper Number: SPE-102412-MS
... Abstract In matrix-acidizing long intervals, diversion is essential to obtain good placement of the reactive fluids. Over the years, several diversion techniques have been applied, resulting in improved zonal coverage. These diversion methods can be divided in mechanical methods...
Proceedings Papers

Publisher: Society of Petroleum Engineers (SPE)
Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 15–18, 2021
Paper Number: SPE-208185-MS
... in extended reach sections and favors a more controlled fluid placement, while reducing displacement volumes. However, conventional CT stimulation practices—consisting of spotting hydrochloric acid (HCl) via CT along the openhole interval using a specific fluid coverage per unit length of the pay zone...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 12–15, 2018
Paper Number: SPE-193167-MS
... condition ✓ High rate and ΔT effects on completion & cement integrity Objectives ✓ Optimum zonal coverage ✓ Keep completion integrity while high rate injection ✓ Use minimum volume of chemicals ✓ Reduce operation risks & costs Optimum acid placement in bullheading...
Proceedings Papers

Paper presented at the 8th European Formation Damage Conference, May 27–29, 2009
Paper Number: SPE-122353-MS
... to the industry. The applications where fluid placement and zonal coverage is important include but are not limited to: Matrix-acidizing treatments Scale-inhibitor squeeze treatments Water-control treatments Water injection for enhanced recovery Hydraulic-fracturing treatments Injection of sand...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Chemistry, February 28–March 2, 2007
Paper Number: SPE-106444-MS
... is the correct downhole placement of the acid for optimum zonal coverage. 2 Though over the years there have been many products and techniques developed in the industry for acid diversion, the preferred ones generally have to possess the following characteristics: Must not cause permanent damage...
Proceedings Papers

Paper presented at the University of Tulsa Centennial Petroleum Engineering Symposium, August 29–31, 1994
Paper Number: SPE-27982-MS
..., and a treatment design should include plans for acid placement. Among the techniques that have been applied to improve acid coverage are mechanical zone isolation, ball sealers, particulate diverting agents, viscosified acids. and foams. In recent years, injection at the highest possible matrix treating rate...
Proceedings Papers

Paper presented at the SPE Europec featured at 82nd EAGE Conference and Exhibition, October 18–21, 2021
Paper Number: SPE-205123-MS
... in the rock matrix. Such a calibration method accounts for the actual reservoir large-scale acid-rock reaction kinetics. Finally, diagnostic tests and main acid treatments were executed that enabled achieving the desired levels of skin reduction, reservoir placement, zone coverage, and hydrocarbon production...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 15–18, 2021
Paper Number: SPE-207733-MS
... controlled fluid placement, reduced displacement volumes, and extended reach capacity, over higher flow rate capabilities from bullheading. However, traditional CT stimulation practices—consisting of spotting hydrochloric acid (HCl) treatment via CT along the openhole section using a specific fluid coverage...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151797-MS
... viscoelastic acid system damage removal zonal coverage carbonate horizontal well agent acidizing spe 151797 coiled tubing good result placement technique society of petroleum engineers For almost two decades, Petrobras main oilfields were represented by sandstones reservoirs, however...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 13–16, 2017
Paper Number: SPE-188927-MS
... Abstract The deployment of hydraulically powered coiled tubing (CT) tractors for matrix acidizing stimulations in extended reach carbonate reservoirs have provided critical benefits to well productivity. The technology allows for uniform placement of the matrix acid treatment while ensuring...
Journal Articles
SPE Drill & Compl 15 (01): 57–62.
Paper Number: SPE-62173-PA
Published: 01 March 2000
...Alan Saxon; Belgacim Chariag; M.R. Abdel Rahman Summary The removal of formation skin damage from carbonate reservoirs is ordinarily accomplished by stimulation with hydrochloric acid. Uniform coverage of the zone being treated during matrix acidizing stimulations of carbonate reservoirs...
Journal Articles
J Pet Technol 62 (06): 53–54.
Paper Number: SPE-0610-0053-JPT
Published: 01 June 2010
..., homogeneous formation intervals (which are rare), perfect “coverage” of the treatment zone often is not possible, unless diversion techniques are used. Acid Placement Matrix acid treatments, whether for sandstones or for carbonates, require similar methods to ensure optimum placement. Unless steps are taken...
Proceedings Papers

Paper presented at the European Formation Damage Conference, May 30–June 1, 2007
Paper Number: SPE-107749-MS
... the application of acid/diversion systems and pumping schedules to improve acid coverage. The selection of in-situ crosslinked and particulate diverters through laboratory testing is described as well as the implementation of a unique mixing system. Several case histories are presented illustrating...

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