The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2019
Filed:
May. 08, 2015
China National Petroleum Corporation Chuanqing Drilling Engineering Company Limited Changqing Downhole Technology Company, Xian, Shaanxi, CN;
Hu Sun, Shaanxi, CN;
Zuwen Wang, Shaanxi, CN;
Mian Zhang, Shaanxi, CN;
Yan Gao, Shaanxi, CN;
Xiuli Shao, Shaanxi, CN;
Jing Li, Shaanxi, CN;
Gaihong Wang, Shaanxi, CN;
Dongrui Yuan, Shaanxi, CN;
Zhiming Jing, Shaanxi, CN;
Junfang Xu, Shaanxi, CN;
Abstract
A recoverable instant thickening acid and its reusing method is usable for the recycling and reusing of a gas well carbonate reservoir acidizing fluid and production stimulation operation. The recoverable instant thickening acid includes the following components in weight percentage: 1.5-3 parts of a thickener, 0.5-3 parts of potassium chloride and 100 parts of a hydrochloric acid solution, wherein the thickener is a mixture composed of a mass ratio of 40%-70% of N-lauryl-N'-hydroxyethyl-N′-hydroxypropyl ethylenediamine propionate or its derivatives, 4%-12% of ethanol and 18%-56% of water. With the thickening acid for performing an acidizing treatment, the residual acid solution can be re-prepared as a thickening acid for an acidizing treatment without a chemical treatment, assisting the green and environmentally friendly production and sustainable development of gas fields.