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Keywords: wormhole
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Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 19–21, 2020
Paper Number: SPE-199262-MS
... Abstract Matrix acidizing of carbonate formations has been widely used as a practical stimulation technique to improve well performance near the wellbore. The principle of a matrix acidizing treatment is to create wormholes by the dissolution of carbonate rocks. The dissolution pattern can...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 7–9, 2018
Paper Number: SPE-189540-MS
... Abstract This paper presents a single-phase alternative to widely used emulsified acid systems. The performance of the new single-phase acid was evaluated for both fracturing and matrix operations and benchmarked against hydrochloric acid and emulsified acid. Wormhole experiments were performed...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 7–9, 2018
Paper Number: SPE-189496-MS
... of the dissolved channels called wormholes and leads to increase in permeability and reduce the acid spent. ( Golfier et al. 2002 ). Successful acid stimulation depends on three important treatment parameters which are fluid volume, injection flow rate, and fluid type. ( Van Domelen, Talib, and Glasbergen 2011...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 7–9, 2018
Paper Number: SPE-189506-MS
... Abstract We present results of a systematic study aimed at the identification of fundamental characteristics of wormhole formation in perforated core experiments and the determination of their underlying dependence on perforation properties. We performed a set of single-phase laboratory...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 7–9, 2018
Paper Number: SPE-189567-MS
... to determine the pore volume to breakthrough (PVBT) and time to breakthrough (TBT) at the various selected injection rate. Characterization and morphology studies of wormhole were done using micro CT imaging. Initial selection of stimulation fluids for matrix acidizing was based on the mineralogical...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 24–26, 2016
Paper Number: SPE-179017-MS
... Abstract An improved 1D-averaged model for wormhole propagation was developed that considers acid spending and leakoff along wormholes. The 1D-averaged type of model is one of several types that have been developed for predicting wormhole propagation during matrix acidizing treatment...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 24–26, 2016
Paper Number: SPE-178962-MS
... Abstract Matrix acidizing is a commonly used stimulation technique for oil and gas wells. In carbonate reservoirs, acid is injected into the formation to dissolve carbonate rock in order to create highly permeable channels called wormholes. For a constant volume of acid injection, different...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 26–28, 2014
Paper Number: SPE-168146-MS
... Abstract The results of matrix stimulation in carbonate formation strongly depend on the acid injection condition. Large amounts of lab tests indicate that an optimum acid interstitial velocity, v i -opt , exists, which results in the minimum volume of acid required for wormhole propagation...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 26–28, 2014
Paper Number: SPE-168198-MS
... selection. Carbonate treatments focus on bypassing damaged zones with the help of so-called "wormholes" that are newly created, highly conductive and tortuous channels. Sandstone treatments, in contradiction, are designed to restore potential damaged rock zones and try to remove the near wellbore damage...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151070-MS
... acidizing. It has been shown that the injection rate must be high enough to allow wormholes to form and propagate Nolte et al. (2000). Pumping below this rate can cause a considerable reduction in treatment effectiveness. Overall, another down side of mechanical diversion techniques is that it can...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151560-MS
... to acidizing fluids during matrix acidizing treatments. One fundamentally interesting phenomenon is the wormholing characteristics ofacidizing tar formation. This paper discusses the effect of acid and its wormholing characteristic on tar and on carbonate rock that was saturated with crudes that have varying...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151760-MS
... was performed at 200°F and 500 psi pore pressure. The core flood experiments showed that when acid was applied after the gel treatment wormholes were created and dissolved the rock around the gel. On other hand, when the gel was applied after the acid, the gel was not able to withstand the differential...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151823-MS
... of preferential channels, which are characteristics of the various patterns of wormhole, is captured by the numerical simulation. The goal of this development is the extraction of the characteristic PVBT curves for any pair formation/acid by numerical simulation. It is possible through the use of measured data...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 10–12, 2010
Paper Number: SPE-127347-MS
... experimental and theoretical work presents wormholing under openhole conditions. When the well completion includes perforated casing, fluid-flow through the perforations is markedly different from that in an openhole completion. The degree of success of an acid job in a perforated completion is limited...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 10–12, 2010
Paper Number: SPE-127923-MS
... Abstract Matrix acidizing is used in carbonate formations to create wormholes that connect the formation to the wellbore. Hydrochloric acid, organic acids, or mixtures of these acids are typically used in matrix acidizing treatments of carbonate reservoirs. However, the use of these acids...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 10–12, 2010
Paper Number: SPE-128074-MS
... Abstract The purpose of matrix stimulation in carbonate reservoirs is to bypass the damaged zones and increase the effective wellbore area. This can be achieved by creating highly conductive flow channels known as wormholes. A further injection of acid will follow the wormhole path where...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 10–12, 2010
Paper Number: SPE-128047-MS
.... The amount of surfactant-based acid required to create wormhole in carbonate matrix is high at both low shear rate (< 900 s -1 ) and high shear rate (> 3,000 s -1 ), and is low at intermediate shear rates with the minimum value at shear rate of 1,500 to 2,000 s -1 . The surfactant retention...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 13–15, 2008
Paper Number: SPE-112373-MS
... pressure (overbalanced pressure), acid will flow into the formation, creating wormholes which further enhance the near-well permeability. If the jetting tool is conveyed on coiled tubing, it can be continuously moved along the well by withdrawing the coiled tubing. When drill pipe is used, acid is jetted...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 13–15, 2008
Paper Number: SPE-112458-MS
.... 199b) may create some degree of damage, especially to tight cores as our lab studies showed. However, the effect of permeability loss by polymers was not significant when compared to the net increase in the permeability due to the formation of a wormhole through the core as in the case of acid...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2006
Paper Number: SPE-98357-MS
... and with highly viscous formation fluids. Carbonate reservoirs are stimulated using acid to dissolve the rock matrix to create conductive pathways from the reservoir to the wellbore.1,2 The conductive channels ( wormholes bypass the damage created during the drilling or cementing process or damage created...

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