Patent
Environment-friendly acidizing working solution suitable for low-permeability carbonate reservoir and preparation method thereof
Yanping Shi,Lang Yu,Shuya Chen,Jihua Cai +3 more
- 14 Apr 2020
TL;DR: In this article, an environment-friendly acidizing working solution suitable for a low-permeability carbonate reservoir was proposed, which can effectively increase the permeability of a carbonate rock reservoir, has a good corrosion inhibition effect on a metal pipe, and is easy to degrade.
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Abstract: The invention provides an environment-friendly acidizing working solution suitable for a low-permeability carbonate reservoir. The environment-friendly acidizing working solution is prepared from thefollowing raw materials in parts by mass: 100 parts of water, 3 to 5 parts of glutamic acid N, N-diacetic acid, 3 to 5 parts of methyl glycine diacetic acid, 3 to 5 parts of methyl sulfonic acid, 5 to10 parts of acetic acid, 1 to 3 parts of potassium chloride and 1 to 3 parts of ammonium chloride. The invention further provides a preparation method of the environment-friendly acidizing working solution. The environment-friendly acidizing working solution provided by the invention is suitable for acidizing a carbonate rock water well, can effectively increase the permeability of a carbonate rock reservoir, has a good corrosion inhibition effect on a metal pipe, and is environment-friendly and easy to degrade.
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Patent
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TL;DR: A treatment composition may contact an oil-based mud (OBM) filter cake formed over at least part of a wellbore for incorporating more oil and/or filter cake particles into the treatment composition as compared to an otherwise identical filter cake as discussed by the authors.
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Patent
Stimulation of wells in nano-darcy shale formations
Andrew Bryce Conway
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TL;DR: In this paper, a treatment mixture containing a metal complexing agent was injected into a nano-darcy shale formation adjacent to a well at a pressure below the fracture pressure of the formation.
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