Water-plugging profile-modifying channel-blocking technology employing heat-sensitive water-soluble gel

A water-soluble gel, water plugging and profile control technology, used in sealing/isolation, production fluid, wellbore/well components, etc., can solve the problems of complex process, insufficient plugging strength, steam channeling, etc. Simple, control over a wide range of effects, adaptable to a wide range of effects

Inactive Publication Date: 2006-09-27
PANJIN LIAOHE OILFIELD TAILIDA TECH INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the oil-water well profile control technology used in the field has problems such as complex process, high cost, and poor selectivity.
For heavy oil fields, there is serious steam channeling in the late stage of steam huffing and puffing, and the currently used sealing channeling technology will cause serious damage to the target layer. At the same tim

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Laboratory preparation thermosensitive (reversible) water-soluble gel:

[0014] Take 4 grams of hydroxypropyl methylcellulose ether, slowly add it to 200ml of water while stirring, then stir for more than 15 minutes, add 1g of KSCN, let it stand for 24 hours, take 15ml of prepared water-soluble gel liquid, and mix it Slowly heated to 70°C, the liquid turns into a stagnant gel, placed in cold water, the gel turns into a liquid, heated again to 70°C, the liquid turns into a gel again.

Embodiment 2

[0015] Embodiment 2: laboratory preparation gel:

[0016] Take 3.5g of hydroxypropyl methylcellulose ether, slowly add it to 200ml of water while stirring, then stir for more than 15min, add 1.5g of NH 4 SCN, place it for 24 hours, take 15ml of the prepared water-soluble gel liquid, heat it slowly to 55°C, the liquid becomes a stagnant gel, put it in cold water, the gel will become a liquid, and again It is heated to 55 ℃, and the liquid turns into a gel again.

Embodiment 3

[0017] Example 3: On-site injection of thermosensitive (reversible) water-soluble gel:

[0018] The thickness of the oil layer in a well is 17m, the porosity of the formation is 27%, and the treatment radius is 4.5m, so the amount of heat-sensitive water-soluble gel is 291.8m 3 . Before construction, prepare five 60m 3 Water tanks, while stirring, add 1.2t of hydroxyethyl methylcellulose to each water tank, and then add 0.2t of ammonium sulfide (NH 4 SCN) was stirred evenly, injected into the formation with a pump truck and shut down the well for 24 hours.

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PUM

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Abstract

The invention relates to a thermo-sensitive water-soluble gel water block sealing technique, which is used to block water in the oil field. Wherein, the invention uses thermo-sensitive reversible water-soluble gel to prepare the solution by adding modifying agent and solidifying agent, as the working substance for blocking water to be filled into the ground; and said gel can be reversible change in a certain range of temperature with the change of temperature; therefore, the it can be changed into gel or liquid in the functions of catalyst and ground temperature field (gel high-temperature and liquid in low-temperature, to block the ground and change the flow direction of water, to improve the oil extraction rate. The invention has simple process and wider application.

Description

Technical field: [0001] The invention relates to a technology for profile control by water plugging of oil-water wells and profile control of steam-injected thermal recovery wells in oilfields. Background technique: [0002] For oil fields developed by waterflooding, the most promising method to enhance oil recovery is to use physical and chemical methods to regulate seepage in formations, and increasing the sweeping range of formations by injecting fluids is the most effective method. At present, the oil-water well profile control technology used in the field has problems such as complex process, high cost, and poor selectivity. For heavy oil fields, there is serious steam channeling in the late stage of steam huff and puff, and the channeling technology currently used will cause serious damage to the target layer. At the same time, there are still problems such as insufficient sealing strength. For profile control of thermal recovery wells, there is no good technology at ...

Claims

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Application Information

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IPC IPC(8): E21B33/10E21B43/16
Inventor 栗波赵长宏张朋李牧曹雅萍高微微郭丽梅刘文民林静徐恩金杨红赵贲张浩齐献宝张玉增
Owner PANJIN LIAOHE OILFIELD TAILIDA TECH INDAL
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