公开(公告)号：US11407929B2

公开(公告)日：2022-08-09

申请号：US16521038

申请日：2019-07-24

Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

Inventor： Badr Ba Geri ,  Ibrahim Gomaa ,  Mohamed Mahmoud ,  Shirish Patil

IPC: C09K8/528 ,  C09K8/03

Abstract: A method is described for removing a barite-quartz and a calcite-quartz filter cake from a well bore. The method involves contacting the filter cake with a first composition comprising NH4F, NaBrO3, NH4Cl, and NaNO2. The NH4Cl and NaNO2 react exothermically, and the heat produced drives the endothermic reaction of NH4F and NaBrO3, which produces HF for dissolution of the quartz in the filter cake. Filter cake comprising barite may be further treated with a second composition comprising a converting agent and a chelating agent. Filter cake comprising calcite may be treated with a first composition having an excess of NH4Cl and NaBrO3, which react to produce HCl for calcite dissolution.

公开(公告)号：US11795378B2

公开(公告)日：2023-10-24

申请号：US16386468

申请日：2019-04-17

Applicant: King Fahd University of Petroleum and Minerals

Inventor： Badr Ba Geri ,  Mohamed Mahmoud ,  Salaheldin Elkatatny ,  Shirish Patil

IPC: E21B43/25 ,  C09K8/74 ,  C09K8/54 ,  E21B41/02

CPC classification number: C09K8/74 ,  C09K8/54 ,  E21B41/02 ,  E21B43/25 ,  C09K2208/32

Abstract: Well stimulating fluids and methods may use a first and a second chelating agent, e.g., diethylene triamine pentaacetic acid (DTPA), glutamic diacetic acid (GLDA), and/or hydroxyethyl ethylene diamine triacetic acid (HEDTA), particularly in amounts of from 1 to 10 wt. %, to control iron precipitation during the stimulation process. Such fluids can stabilize iron ions without precipitation to manage the efficiency and performance of the stimulation fluid. Such stimulation fluids can be used with for highly concentrated HCl solutions, e.g., more than 20 up to 28 wt. % or more, that are useful in emulsified acid formulations in acid fracturing or acidizing of carbonate formations.