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Keywords: acidizing
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Proceedings Papers

Paper presented at the SPE Oklahoma City Oil and Gas Symposium, March 27–31, 2017
Paper Number: SPE-185097-MS
... Abstract This literature review summarizes the theory and application of chelating agents in acidizing both carbonate and sandstone formations, and in hydraulic fracturing. The objective of this work is to explain the key role that chelating agents play in stimulation. This paper reviews...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 1–5, 2015
Paper Number: SPE-173607-MS
... velocity in pores. Abstract Optimal design of matrix acidizing treatments in long horizontal wells represents a technical challenge for stimulation engineers. Acid coverage and distribution are particularly challenging because differences in formation permeability can be a predominant feature in...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 1–5, 2015
Paper Number: SPE-173626-MS
... Acidizing Treatment of high temperature wells most often poses a number of problems which are usually not encountered in low temperature wells ( Buijse et al 2000 ; Mahmoud et. al 2011 ; Legemah et. al 2014 ). Challenges associated with high temperature acidizing include high formation-acid...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 23–26, 2013
Paper Number: SPE-164472-MS
... Abstract Regular mud acid, which is composed of HCl and HF, has been extensively used to remove the formation damage in sandstone reservoirs; however, many problems may occur during stimulation treatments with this acid. To overcome many of these drawbacks, sandstone acid systems (HF and a...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 23–26, 2013
Paper Number: SPE-164517-MS
... Abstract Acidization of carbonate rocks is a common practice to reduce the formation damage near wellbore. In this process, an acidic solution is injected to dissolve some of the rock that creates conducting channels called wormholes. These wormholes facilitate the flow of hydrocarbons to the...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 23–26, 2013
Paper Number: SPE-164487-MS
... Abstract Acid treatments in deep wells drilled in carbonate reservoirs represent a challenge to the oil industry. Emulsified acid can be used in matrix acidizing and acid fracturing treatments. The delayed nature of emulsified acid is useful in creating deep wormholes and etched fracture...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 23–26, 2013
Paper Number: SPE-164491-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 Production and Operations Symposium, March 23–26, 2013
Paper Number: SPE-164480-MS
... SPE 164480 Reactions of Simple Organic Acids and Chelating Agents with Dolomite Adenuga, O.O., Sayed, M.A., Nasr-El-Din, H.A., Texas A&M University, All SPE Members Copyright 2013, Society of Petroleum Engineers This paper was prepared for presentation at the SPE Production and Operations...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-140128-MS
... miscible in most acid treatments, and it is extremely flammable. These two issues together make xylene a dangerous choice for paraffin removal. Fully miscible micellar acidizing solvents can solve paraffin problems more safely and effectively. These micellar acidizing solvents are less flammable...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-140138-MS
... Abstract Hydrochloric acid has been extensively used for well stimulation in matrix acidizing and acid fracturing. However, high reaction rate and severity of corrosion problems, especially for wells completed with Cr-based tubulars, limit the usage of the straight acid, especially for deep gas...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-140149-MS
... prepare the 20 wt% GLDA solutions. The dissolving power of various acids with that of calcite and dolomite are listed in Table 1 ( Schechter 1992 ). The dissolution power of different acids for dolomite is less than calcite. The dissolution of dolomite by HCl depends on temperature and the...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-142389-MS
... Abstract Acid fracturing is a stimulation process in which the dissolution of the fracture faces creates conductivity after fracture closure. The resulting fracture conductivity depends highly on the amount and pattern of etching in addition to the strength of asperities. While there has been...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-141337-MS
... upstream oil & gas post-stimulation performance saudi arabia hydraulic fracturing polymer stimulation treatment perforated interval viscosity acid diversion fracture associative polymer diversion acid blend diversion carbonate formation acidizing crosslinked gel 8 emulsified...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 27–29, 2011
Paper Number: SPE-142264-MS
... studies included hydrochloric acid (HCl, 36.8 wt%, Mallinckrodt Backer Inc.) and calcium carbonate (CaCO 3 , ACS reagent grade, > 99.0%, Sigma Aldrich Inc.). All solutions were prepared using de-ionized water with a resistivity of 18.2 mfl-cm at 25°C. Fig. 1 High temperature hydrolysis reaction...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, April 4–8, 2009
Paper Number: SPE-120772-MS
... original wellbore. In open-hole limestone formations, one innovative technique can achieve both of these goals simultaneously, creating pre-stimulated "tunnels" that bypass existing near-wellbore damage to make contact with new reservoir rock. The new technology relies on limestone's acid solubility and a...
Proceedings Papers

Paper presented at the Production and Operations Symposium, March 31–April 3, 2007
Paper Number: SPE-106710-MS
... hydraulic fracturing Reservoir Characterization structural geology oil production conductivity Fluid Dynamics carbonate complex lithology reservoir acid rock reaction reaction flow in porous media Upstream Oil & Gas acid deep-penetration acid clay mineral gelled acid...
Proceedings Papers

Paper presented at the Production and Operations Symposium, March 31–April 3, 2007
Paper Number: SPE-106986-MS
... stimulation method is acid fracturing. Discussed are the critical issues to achieve a successful stimulation using acid at plus 300°F. In addition, techniques employed will be reviewed. One technique is stimulation in a single treatment using ball sealers for diversion and CO2 for load recovery. A second...
Proceedings Papers

Paper presented at the Production and Operations Symposium, March 31–April 3, 2007
Paper Number: SPE-106985-MS
... isolation. Between each of these packers is a sliding sleeve to facilitate stimulation. The Devonian has a limestone, dolomite and chert composition which makes acid fracturing the method of choice for stimulation. Given the open annular space between the packers, zonal coverage is dependent upon rate and...
Proceedings Papers

Paper presented at the Production and Operations Symposium, March 31–April 3, 2007
Paper Number: SPE-106131-MS
... Abstract Acid formulation design for well stimulation requires careful experimentation for quantitative and qualitative identification of different elements present in spent acid and also mineralogical analysis of core samples. In depth lithological studies, experienced personnel and long...
Proceedings Papers

Paper presented at the SPE Production and Operations Symposium, March 23–25, 2003
Paper Number: SPE-80894-MS
..., TX 75083-3836 U.S.A., fax 01-972-952-9435. Abstract The most common reason of formation damage is the drilling operations. Mud invasion is the major problem that affects well productivity in HAOUD BERKAOUI field. As the source of damage is known, different types of acid systems are proposed by...

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