Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of a green temperature-resistant and salt-resistant profile control agent

A temperature-resistant, salt-resistant, and profile-modifying agent technology, which is applied in the direction of chemical instruments and methods, and drilling compositions, can solve problems such as poor temperature and salt resistance, environmental pollution, and easy degradation, and achieve good stability and reduce Production cost, low cost effect

Inactive Publication Date: 2018-06-08
WUHAN INSTITUTE OF TECHNOLOGY
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, polyacrylamide profile control agents are widely used in China, which has problems such as poor temperature resistance and salt resistance, and easy degradation, which limits its application in oil fields.
Although the emergence of cross-linked polyacrylamide copolymer has improved its temperature and salt resistance, the organic cross-linking agents such as formaldehyde, phenol, etc. or inorganic cross-linking agents such as potassium dichromate and potassium citrate are harmful to the environment. causing different levels of pollution

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
  • Preparation method of a green temperature-resistant and salt-resistant profile control agent
  • Preparation method of a green temperature-resistant and salt-resistant profile control agent
  • Preparation method of a green temperature-resistant and salt-resistant profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a green temperature-resistant and salt-resistant profile control agent, the preparation steps are as follows:

[0022] Dissolve 3g of sodium humate completely with 97g of distilled water, add 0.020g of cross-linking agent N,N'-methylenebisacrylamide, 0.5g of initiator K 2 S 2 o 8 and 20 g of acrylic acid neutralized with 40 g of a 20% NaOH solution, and polymerized at 65° C. in a nitrogen-enclosed environment until the reaction is complete to obtain a cross-linked product profile control agent.

[0023] After purification and drying of the obtained cross-linked product profile control agent and the used raw material sodium humate, an infrared test was carried out to obtain an infrared spectrum comparison chart, as shown in the attached figure 1 shown. In the infrared spectrum of NaHA / AA cross-linked copolymer, 1577.41cm -1 The asymmetric stretching vibration of groups such as C=C, -COOH and 1022.84cm -1 The stretching vibration peak of C=C a...

Embodiment 2

[0025] Dissolve 5g of sodium humate completely with 97g distilled water, add 0.010g crosslinking agent N-methylolacrylamide, 0.5g initiator (NH 4 ) 2 S 2 o 8 and 15 g of acrylic acid neutralized with 30 g of a 20% NAOH solution, and polymerized at 60° C. in a nitrogen-enclosed environment until the reaction is complete to obtain a cross-linked product profile control agent.

[0026] During the test, the viscosity of the gel was measured with an NDJ-8S viscometer, and the temperature and salt resistance properties are shown in the attached figure 2 And attached image 3 As shown, the temperature resistance range is 80~120℃; the applicable coarse salt concentration range: 0~2.0×10 5 mg / L.

Embodiment 3

[0028] Dissolve 3g of sodium humate completely with 97g of distilled water, add 0.015g of cross-linking agent polyethylene glycol diacrylate, 0.5g of initiator Na 2 SO 3 / (NH 4 ) 2 S 2 o 8 and 15 g of acrylic acid neutralized with 30 g of a 20% NAOH solution, and polymerized at 45° C. in a nitrogen-enclosed environment until the reaction is complete to obtain a cross-linked product profile control agent.

[0029] During the test, the viscosity of the gel was measured with an NDJ-8S viscometer, and the temperature and salt resistance properties are shown in the attached figure 2 And attached image 3 As shown, the temperature resistance range is 80~120℃; the applicable coarse salt concentration range: 0~2.0×10 5 mg / L.

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 a preparation method of a green temperature-resistant and salt-resistant profile control agent, comprising the following steps: completely dissolving the sodium humate monomer in distilled water, adding a crosslinking agent, an initiator and an acrylic acid monomer neutralized with NaOH solution, and Polymerization reaction is carried out at 40-80° C. under a nitrogen-enclosed environment until the reaction is complete to obtain. The invention has the following advantages: 1) The cost of raw materials is low, widely available, and can greatly reduce the production cost; and the obtained profile control agent has no pollution to the environment; 2) By changing the monomer ratio, the concentration of the crosslinking agent and the initiator, Or change the reaction temperature, cross-linking agent type, initiation system, control the viscosity of the system and the performance of the gel after gelation; 3 has a certain fluidity, easy to inject downhole, can effectively seal the high permeability layer in the formation, and play a role in plugging. The purpose of water profile control; 4) It can have good stability in the temperature range of 80°C to 120°C and the salt concentration range of 0 to 2.0×105mg / L.

Description

technical field [0001] The invention relates to the field of chemical industry, especially the field of oil field recovery, and specifically relates to a preparation method of a green temperature-resistant and salt-resistant profile control agent. Background technique [0002] In the late stage of oilfield exploitation, the water cut increases, the porosity becomes larger, and the oilfield is difficult to exploit. Using profile control agent to control the profile of the oil layer can improve this phenomenon. Chemical profile control is to inject a profile control agent into the formation to adjust the water absorption profile of the heterogeneous formation and improve the water drive sweep coefficient, thereby enhancing the recovery of crude oil. [0003] At present, the polyacrylamide type profile control agent is widely used in China. It has problems such as poor temperature resistance and salt resistance, easy degradation, etc., which limits its application in oil fields...

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 Patents(China)
IPC IPC(8): C08F289/00C08F220/06C09K8/512
Inventor 杨隽潘小杰王芬徐黎刚闫霜姚棋
Owner WUHAN INSTITUTE OF TECHNOLOGY