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Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent

A technology of hexamethylenetetramine and high temperature resistant gel, which is applied in drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve the problem of unsatisfactory plugging effect and poor plugging ability , poor temperature resistance, etc.

Pending Publication Date: 2022-03-01
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gelation temperature of conventional organic cross-linked polymers is low and when the temperature is higher than 120°C, the plugging ability becomes poor
Therefore, when conventional organic cross-linked polymer gel is used to regulate plugging in thermally recovered high-temperature reservoirs, the temperature resistance of the plugging agent cannot meet the temperature requirements of the oil and gas reservoir, resulting in unsatisfactory plugging regulation effect.
In order to overcome the shortage of poor temperature resistance of conventional gel plugging agents, it is necessary to study high temperature resistant gel plugging agents to meet the profile control requirements of thermal recovery high temperature reservoirs

Method used

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  • Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent
  • Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent
  • Bisphenol S and hexamethylenetetramine cross-linked high-temperature-resistant gel plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 0.4g polyacrylamide to 98.72g water and stir for 2 hours, add 0.4g hexamethylenetetramine, 0.4 bisphenol S, 0.04g oxalic acid and 0.04g ammonium chloride, and continue stirring for 20 minutes to form a temperature-resistant gel plugging agent .

[0041] The components (by mass percentage) of the high temperature resistant gel plugging agent prepared in this example are: 0.4% polyacrylamide + 0.4% hexamethylenetetramine + 0.4% bisphenol S + 0.04% oxalic acid + 0.04% chloride Ammonium.

[0042] The high temperature resistant gel plugging agent prepared in this example has a gelation time of 50 hours at an ambient temperature of 100°C; a gelation time of 28h at an ambient temperature of 120°C; and a gelation time of 12h at an ambient temperature of 150°C.

Embodiment 2

[0044] After adding 0.6g polyacrylamide to 98.08g water and stirring for 2 hours, add 0.6g hexamethylenetetramine, 0.6g bisphenol S, 0.06g oxalic acid and 0.06g ammonium chloride, and continue stirring for 20 minutes to form a heat-resistant gel plug. agent.

[0045] The components (by mass percentage) of the high temperature resistant gel plugging agent prepared in this example are: 0.4% polyacrylamide + 0.6% hexamethylenetetramine + 0.6% bisphenol S + 0.06% oxalic acid + 0.06% chlorinated Ammonium.

[0046] The high temperature resistant gel plugging agent prepared in this example has a gelation time of 41 hours at an ambient temperature of 100°C; a gelation time of 22h at an ambient temperature of 120°C; and a gelation time of 9 hours at an ambient temperature of 150°C.

Embodiment 3

[0048] Add 0.8g polyacrylamide to 97.44g water and stir for 2 hours, add 0.8g hexamethylenetetramine, 0.8g bisphenol S, 0.08g oxalic acid and 0.08g ammonium chloride and continue stirring for 20 minutes to form a temperature-resistant gel plugging agent .

[0049] The components (by mass percentage) of the high temperature resistant gel plugging agent prepared in this example are: 0.8% polyacrylamide + 0.8% hexamethylenetetramine + 0.8% bisphenol S + 0.08% oxalic acid + 0.08% chloride Ammonium.

[0050] The high temperature resistant gel plugging agent prepared in this example has a gelation time of 35 hours at an ambient temperature of 100°C, and the structural state after gelation is as follows figure 1 As shown; the gelation time is 19h at an ambient temperature of 120°C, and the structural state after gelation is as follows figure 2 As shown; the gelling time is 7 hours at an ambient temperature of 150°C, and the structural state after gelling is as follows image 3 sh...

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Abstract

The invention discloses a high-temperature-resistant gel plugging agent cross-linked by bisphenol S and hexamethylenetetramine and a preparation method of the high-temperature-resistant gel plugging agent. The high-temperature-resistant gel plugging agent comprises the following components in percentage by mass: 0.4%-1.0% of hexamethylenetetramine; 0.4%-1.0% of bisphenol S; 0.4% to 1.0% of polyacrylamide; 0.04%-0.10% of a stabilizing agent; 0.04% to 0.10% of a delayed cross-linking agent; and the balance of water. The gelling time of the high-temperature-resistant gel plugging agent at the ambient temperature of 100-150 DEG C is 6-50 h, and the high-temperature-resistant gel plugging agent has the characteristics of low initial viscosity, gelling at high temperature and stable viscosity at high temperature, has good plugging property at high temperature, and can be used for thermal recovery of high-temperature oil.

Description

technical field [0001] The invention relates to a high-temperature-resistant gel plugging agent, in particular to a high-temperature-resistant gel plugging agent cross-linked by bisphenol S and hexamethylenetetramine. Background technique [0002] For oil reservoirs that are thermally recovered by means of steam injection or burning oil layers, high temperature resistant plugging agents should also be used in profile control. Currently, the most widely studied and used plugging agent is gel plugging agent. Gel plugging agents are usually inorganic metal ion cross-linked polymer gel systems, phenolic resin cross-linked polymer gel systems and polyethyleneimine cross-linked polymer gel systems. Among them, the high temperature resistance of the gel system formed by the organic cross-linking agent is better than that of the metal cross-linking agent. The gelation temperature of conventional organic cross-linked polymers is low, and when the temperature is higher than 120°C, t...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/512C09K8/516E21B33/13E21B43/24
CPCC09K8/5083C09K8/512C09K8/516E21B33/13E21B43/24
Inventor 刘义刚钟立国刘建斌张华唐晓旭韩晓冬王秋霞张洪周法元张伟刘昊王弘宇刘东李军
Owner CHINA NAT OFFSHORE OIL CORP