Supercharge Your Innovation With Domain-Expert AI Agents!

Glacial acetic acid crosslinked weighted fracturing fluid as well as preparation method and application thereof

A fracturing fluid and base fluid technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of the weight of the cross-linked jelly acid system, the complex composition of the cross-linking agent, the complex preparation process, etc. problems, to achieve the effects of expanded use, low viscosity of glue breaking liquid, and simple process

Active Publication Date: 2019-03-08
PETROCHINA CO LTD
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In general, the prior art has realized the ground crosslinking of the crosslinking agent and thickener under acidic conditions to a certain extent, but the acid used in the prior art is generally hydrochloric acid and the composition of the crosslinking agent is complex, mainly organic Metal cross-linking agents or organic complex kinases have the disadvantages of complex preparation process and high cost. On the other hand, there is no report on the research on the aggravation of cross-linked jelly acid systems.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Glacial acetic acid crosslinked weighted fracturing fluid as well as preparation method and application thereof
  • Glacial acetic acid crosslinked weighted fracturing fluid as well as preparation method and application thereof
  • Glacial acetic acid crosslinked weighted fracturing fluid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] This embodiment provides a weighted fracturing fluid of cross-linked glacial acetic acid, which is 100% by mass percentage, and the weighted fracturing fluid includes the following components:

[0038] Glacial acetic acid 23wt%, potassium formate 50%, polyacrylamide polymer 1.2wt%, aldehyde crosslinking agent urotropine 0.5wt%, crosslinking activator tetramethylethylenediamine 0.01wt%, high temperature stabilizer Sodium thiosulfate 3%, corrosion inhibitor benzotriazole 1.5wt%, iron ion stabilizer erythorbic acid 1.0wt%, ammonium persulfate 0.05wt%, and the balance is water; the acid is calculated as a pure substance.

[0039] Wherein, the polyacrylamide polymer is a polymer polymerized from acrylamide, dimethyl diallyl ammonium chloride, acrylic acid, and vinylpyrrolidone, and its viscosity-average molecular weight is 2.5 million to 6 million. The degree of hydrolysis is not higher than 5%. The mass ratio of acrylamide, dimethyl diallyl ammonium chloride, acrylic acid a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a glacial acetic acid crosslinked weighted fracturing fluid as well as a preparation method and an application thereof. The weighted fracturing fluid is prepared from the following components in percent by weight (based on 100%): 15-28 wt% of glacial acetic acid, 1-70 wt% of potassium formate, 0.8-1.5 wt% of a polyacrylamide polymer, 0.2-0.8 wt% of an aldehyde crosslinking agent, 0.005-0.02 wt% of a polyamine crosslinking activator, 1-5 wt% of a high-temperature stabilizer, 0.5-2.0 wt% of a corrosion inhibitor, 0.5-2.0 wt% of an iron ion stabilizer, 0.01-0.1 wt% of ammonium persulfate and the balance water. According to the weighted fracturing fluid, the crosslinking agent, the crosslinking agent activator and the polyacrylamide polymer can be crosslinked quickly andefficiently in the presence of high concentration glacial acetic acid and potassium formate at normal temperature (25 DEG C) or at a lower temperature. In addition, a superhigh temperature glacial acetic acid crosslinked weighted fracturing fluid system is suitable for a deep high temperature carbonate reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field transformation, and in particular relates to a cross-linked glacial acetic acid weighted fracturing fluid and its preparation method and application. Background technique [0002] As a conventional and effective oil and gas stimulation measure, acid fracturing is widely used in carbonate formations. On the one hand, the ordinary acid system has low viscosity, strong fluid loss, and fast acid-rock reaction speed, which makes it difficult to achieve the purpose of connecting fractured (cavity) reservoirs in the far well zone. On the other hand, the acid system has high friction resistance and acid fracturing The high construction pressure limits the depth of acid fracturing. At present, a series of acid fluid systems suitable for reservoir stimulation in carbonate formations have been developed, including temperature-controlled viscous acid, diverting acid, high-temperature gelling acid, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K8/68C09K8/72C09K8/74C09K8/88E21B43/26E21B43/27
CPCC09K8/685C09K8/725C09K8/74C09K8/887C09K2208/26E21B43/26
Inventor 王超崔明月姚飞梁冲张建利陈军晏军舒玉华崔伟香张合文朱大伟
Owner PETROCHINA CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com