CALCIUM METHYLGLYCINE DIACETIC ACID SALT PARTICLES AND SUBTERRANEAN OPERATIONS RELATING THERETO

摘要

Particles that comprise calcium methylglycine diacetic acid salt (“Ca-MGDA salt”) may be useful for fluid diversion in subterranean operations. In some instances, the particles may be formed in the subterranean formation. For example, a method may involve introducing a treatment fluid into a wellbore penetrating a subterranean formation, wherein the treatment fluid comprises an aqueous base fluid, MGDA or salt thereof, and an acid in an amount of about 3% or greater by weight of the aqueous base fluid; acidizing a portion of the subterranean formation comprising calcium carbonate resulting in a concentration of calcium in the treatment fluid that exceeds about 50,000 ppm; and precipitating a plurality of particles that comprise a Ca-MGDA salt in the portion of the subterranean formation, thereby reducing fluid flow therethrough. In some instances, the particles that comprise Ca-MGDA salt may be included in a treatment fluid before introduction into the subterranean formation.

主权项

1. A method comprising:
introducing a treatment fluid into a wellbore penetrating a subterranean formation, wherein the treatment fluid comprises an aqueous base fluid, methylglycine diacetic acid (“MGDA”) or salt thereof, and an acid in an amount of about 3% or greater by weight of the aqueous base fluid; acidizing a first portion of the subterranean formation comprising calcium carbonate resulting in a concentration of calcium in the treatment fluid that exceeds about 50,000 ppm; precipitating a plurality of particles that comprise a Ca-MGDA salt in the first portion of the subterranean formation, thereby reducing fluid flow therethrough; and diverting a portion of the treatment fluid or a subsequent treatment fluid from the first portion of the subterranean formation to a second portion of the subterranean formation.