Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling

A reservoir protection agent and nano-membrane technology, which is applied in the field of oil drilling, can solve problems such as water sensitivity, water lock damage, unsatisfactory reservoir protection effect, and filtrate intrusion, so as to improve the recovery value of core permeability and improve physical and mechanical properties. Performance, the effect of reducing filtration loss

Active Publication Date: 2017-03-29
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reservoir protection agent is added to the drilling fluid, the reservoir protection effect is not ideal because the characteristics of the low-permeability reservoir are not fully considered, and the filtrate often invades the reservoir, resulting in damage such as water sensitivity and water lock.

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
  • Nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling
  • Nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling
  • Nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] In a second aspect, the present invention provides a method for preparing a nano-membrane structure reservoir protection agent, the method comprising:

[0033] (1) The monomer M1 is intercalated with organic montmorillonite, and in the presence of a chain transfer agent and a first initiator, an in-situ polymerization reaction is carried out to obtain [M1]n / montmorillonite;

[0034] (2) The [M1]n / montmorillonite obtained in step (1) is used as a macromolecular chain transfer agent, mixed with the second initiator and monomer M2, and polymerized, and then the [M1]n in the reaction product is removed Homopolymer to obtain a nano-film structure reservoir protection agent;

[0035] Wherein, the structural formulas of monomer M1 and monomer M2 are respectively:

[0036] M1: M2:

[0037] Among them, R 1 , R 2 , R 3 , R 4 and R 5 each independently hydrogen, C 1 -C 4 Alkyl or C 1 -C 4 The alkoxyl group, R 6 for C 1 -C 6 of alkylene.

[0038] In the method of...

Embodiment

[0061] The present invention will be described in detail through examples below, but the present invention is not limited thereby. In the following preparation examples, examples and comparative examples, unless otherwise specified, the materials used are all commercially available, and the methods used are all conventional methods in the art.

[0062] 2-Acrylamido-2-methylpropanesulfonic acid was purchased from Chengdu Gracia Chemical Technology Co., Ltd.

[0063] Benzyl dithiobenzoate, α-isobutyronitrile dithionaphthoate, cumyl dithiobenzoate and cumyl dithiobenzoate were purchased from Nanjing Qiafenghe Pharmaceutical Technology Co., Ltd.

[0064] Styrene, p-methylstyrene, p-methoxystyrene, and n-butylstyrene were purchased from Chengdu Gracia Chemical Technology Co., Ltd.

[0065] Cetyltrimethylammonium chloride was purchased from Shanghai Fusheng Industrial Co., Ltd.

[0066] Sodium montmorillonite was purchased from Xinjiang Zhongfei Xiazijie Bentonite Co., Ltd.

[00...

preparation example 1

[0069] 1. Preparation of organic montmorillonite

[0070] Put 5g of sodium montmorillonite, 3g of cetyltrimethylammonium chloride and 100ml of distilled water in a 250ml flask, stir at 120rpm in a water bath at 80°C for 4h, let stand overnight, remove the upper solution, filter, and wash with deionized water to no Cl - (with a concentration of 0.01mol / L AgNO 3 solution test), dried in a vacuum oven at 70°C, and crushed through a 300-mesh sieve to obtain organic montmorillonite (O-MMT).

[0071] 2. Preparation of nano-membrane structure reservoir protection agent

[0072](1) In a three-necked flask equipped with a thermometer and a mechanical stirrer, add styrene, benzyl dithiobenzoate and azobisisobutyronitrile at a molar ratio of 400:1:0.4, and add styrene 5% by weight of organic montmorillonite, after sealing the reaction device, the air in the system was removed by freezing and vacuuming, filled with nitrogen, and circulated for 3 times, fully stirred under the protectio...

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 relates to the technical field of petroleum drilling, and discloses a nanofilm structure reservoir protection agent and preparation method thereof and drilling fluid and application of the nanofilm structure reservoir protection agent or drilling fluid in low permeability reservoir drilling. The nanofilm structure reservoir protection agent comprises a montmorillonite lamella, a structure unit shown in formula (1) as shown in the description and a structure unit shown in formula (2) as shown in the description, wherein R1, R2, R3, R4 and R5 are respectively and independently hydrogen, CD-C4 alkyl or C1-C4 alkoxy, and R6 is C1-C6 alkylene. The invention further provides the drilling fluid containing the nanofilm structure reservoir protection agent disclosed by the invention. The drilling fluid containing the nanofilm structure reservoir protection agent shows good rheological property, anti-temperature property, anti-collapsing property and reservoir protection property when being applied for the low permeability reservoir drilling.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a nano-membrane structure reservoir protection agent and its preparation method, drilling fluid and its application in low-permeability reservoir drilling. Background technique [0002] Drilling fluid is one of the important guarantees to ensure the safety, quality, efficiency and speed of drilling production operations. Drilling fluid must be used in oilfield development operations. [0003] Effective reservoir protection is an effective guarantee to achieve higher oil and gas recovery, so that the skin coefficient is negative to achieve the best. During the drilling process, if the drilling fluid is improperly designed or used, the liquid and solid in the drilling fluid will invade the reservoir and have physical and chemical interactions with the clay and other minerals in the reservoir, which will significantly reduce the oil formation near the wellbore. Permeabil...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C08F257/02C08F112/08C08F220/58C08K9/04C08K3/34
CPCC08F112/08C08F257/02C08K3/346C08K9/04C09K8/035C09K8/24C08F220/585C09K8/032C09K8/516
Inventor 孙金声吕开河刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com