... tubulars, and minimizing acid additives. However, using this acid to treat wells with asphaltene deposition requires removing asphaltene first using a suitable aromatic-based solvent, and then using a matrix acid treatment. This additional step increases the cost and time needed to execute acid treatments...

... acid diversion acid treatment elibrary servlet spepreview knowledge management drilling fluid chemistry enhanced recovery production monitoring saudi arabia government reservoir surveillance completion installation and operations well intervention flow in porous media drilling fluid...

...-or frac-packing operations to clean up long intervals after perforating. Success or failure of these treatments is often related to the efficiency of diverting agents, especially for acid treatments on wells with long, heterogeneous intervals or multiple-zone completions. A VES diverting agent...

... long horizontal wells with OH completions. The simplicity of the system makes it the fluid of choice, especially in offshore and sour environments. The absence of metallic crosslinkers in this system eliminates problems associated with sulfide precipitation in sour wells. Acid treatments conducted...

... innocuous brine spacers, to maintain separation of the (spent) acid and completion brine, and the use of an appropriate post-flush acid to maintain a low pH in the spent acid. If a precipitate does form, it can be readily cleaned up by acid treatment, if the acid reaches the occluding precipitate. Complex...

... upstream oil & gas disposal well reaction rate well flowback sample stimulation emulsified acid produced water discharge injection rate fluid dynamics acidizing acid treatment in-situ gelled acid application reservoir acid-in-diesel emulsion apparent viscosity wastewater disposal well...

... reservoir fraction wormhole length acid treatment carbonate reservoir reservoir surveillance wormhole tip pore production control approximation wormhole spending rate diffusion wormhole propagation rate production monitoring fluid loss concentration profile reaction rate flow in porous...

...Ding Zhu; A. D. Hill Summary The use of an inverse injectivity vs. superposition time plot to diagnose the changing skin factor in a matrix acidizing treatment has been presented previously by Hill and Zhu. 1 The model has been extended to calculate skin factor as a function of injection time...

... simulation to agree with the penetration, are determined. These parameters and other engineering assumptions can be used in the design of future treatments. simulation pressure transient analysis reaction rate reservoir surveillance fracture conductivity fluid dynamics acid treatment evaluation...

...S. K. Cheung Summary The effects of acids on the integrity of gravels and proppants should be considered in acid treatments. This paper reports on the influence of acid type, acid concentration, and contact duration on the acid solubility of five sands and bauxitic materials. The effects...

... insoluble solids in the well. Evidence indicates, however, that even these soluble products remain in perforation tunnels and impair productivities of wells. Examples of wells indicating this effect during post-gravel-pack acid treatments are discussed. The theory of why this occurs and calculations...