Unlock instant, AI-driven research and patent intelligence for your innovation.
An elastic graphite strong adsorption plugging agent and oil-based drilling fluid
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of oil-based drilling fluid and elastic graphite, which is applied in the field of oil-based drilling fluid, can solve problems such as wellbore instability, and achieve the effects of enhanced plugging performance, reduced fluid loss rate, and good compatibility
Active Publication Date: 2022-04-15
SOUTHWEST PETROLEUM UNIV
View PDF20 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0004] Aiming at the problem of well wall instability caused by the inability of conventional plugging agents to effectively plug the micropores in shale, the present invention provides an elastic graphite strong adsorption plugging agent, the smallest particle size of which can reach the nanometer level, and can Effectively seal the micron-scale and nano-scale pores and fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall
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
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0022] Weigh 2.5g of elastic graphite powder ground to 200nm, add 65ml of concentrated sulfuric acid, stir and react in an ice bath at -2°C for 30min, then add 2g of sodium nitrate and continue stirring for 30min; slowly add 8g of potassium permanganate, and control the temperature at 20 ℃, stir for 2 hours; raise the temperature to 35℃, let stand for 2 hours, add 150mL of deionized water dropwise, then raise the temperature to 98℃, after a golden yellow suspension appears, add 20mL of hydrogen peroxide, and then add 150mL of deionized Water, ultrasonically dispersed for 1 h; after the reaction, put it into a centrifuge, centrifuge at 5000 rpm for 5 min, then filter, then wash the solid matter with deionized water and absolute ethanol for 3 times, and finally, vacuum dry the solid at 60°C for 24 h to obtain Oxidized elastic graphite.
[0023] Disperse 0.5g of oxidized elastic graphite in 100mL of distilled water, and use ultrasonic treatment for 1h to obtain a uniform solution...
Embodiment 2
[0027]Weigh 3g of elastic graphite powder ground to 200nm, add 80ml of concentrated sulfuric acid, stir and react in an ice bath at -2°C for 35min, then add 2.5g of sodium nitrate and continue stirring for 30min; slowly add 10g of potassium permanganate, and control the temperature to 20 ℃, stirred for 2.0h; raised the temperature to 35℃, stood for 2.5h; added 150mL of deionized water dropwise, then raised the temperature to 98℃, and after a golden yellow suspension appeared, added 20mL of hydrogen peroxide, and then added 150mL of Deionized water, ultrasonic dispersion for 1h; after the reaction, put it in a centrifuge, centrifuge at 5000rpm for 5min, then filter, then wash the solid matter with deionized water and absolute ethanol for 3 times, and finally, vacuum dry the solid at 60°C for 24h , to obtain oxidized elastic graphite.
[0028] Disperse 0.8g of oxidized elastic graphite in 100mL of distilled water, and use ultrasonic treatment for 1 hour to obtain a uniform solut...
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
Property
Measurement
Unit
density
aaaaa
aaaaa
density
aaaaa
aaaaa
particle diameter
aaaaa
aaaaa
Login to View More
Abstract
The invention discloses an elastic graphite strong adsorption plugging agent and oil-based drilling fluid, belonging to the technical field of oil and gas field drilling. The elastic graphite strong adsorption plugging agent is mainly composed of elastic graphite, N,N-dimethyl 1,3-propylenediamine, epichlorohydrin and long-chain alkyl dimethyl tertiary amine. It is prepared, contains multiple quaternary ammonium functional groups, and has strong adsorption performance on the well wall. Among them, the synthetic raw materials of the plugging agent are easy to obtain, and the synthetic method is simple and reliable. The particle size distribution of the synthesized elastic graphite strong adsorption plugging agent is between 0.5-28 μm, which can effectively block the nano- and micro-pores and fractures in the shale well wall. The plugging agent can be directly added to the oil-based drilling fluid. It has good compatibility and can effectively prevent the drilling fluid from penetrating into the formation, thereby stabilizing the well wall and preventing collapse, and has a good plugging and fluid loss reduction effect.
Description
technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to an elastic graphite strong adsorption plugging agent and an oil-based drilling fluid containing the plugging agent. Background technique [0002] During the development of oil and natural gas resources, the exploitation of deep shale gas has always been a research hotspot for researchers. For some hard, brittle and fractured formations with bedding and micropores and fractures, the invasion of oil-based drilling fluid filtrate will bring formation instability factors. In addition, the transmission of hydraulic pressure through micropores and fractures will also lead to wellbore instability. Therefore, it is necessary to strengthen the sealing performance of oil-based drilling fluids on micropores and fractures. At present, there are few types of plugging agents for oil-based drilling fluids, and most of the plugging materials used are bridge plug-type LWD mate...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More