Water blocking releasing agent for oil and gas reservoirs and preparation method thereof

A technology for water-blocking agents and oil and gas reservoirs, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost of water-blocking agents, environmental pollution, complex production processes, etc., and increase the relative permeability of oil phase , good surface activity and simple production process

Inactive Publication Date: 2020-05-15
XIAN AODE PETROCHEM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing dehydration and locking agents have high cost, complex production process and may cause some pollution to the environment

Method used

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  • Water blocking releasing agent for oil and gas reservoirs and preparation method thereof
  • Water blocking releasing agent for oil and gas reservoirs and preparation method thereof
  • Water blocking releasing agent for oil and gas reservoirs and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of dodecyl fructoside:

[0037] Step 1: Add 6 mol of n-dodecyl alcohol and 1 mol of fructose (slowly and in batches) into the reactor, heat up to 90°C, and after stirring evenly, add the catalyst concentrated sulfuric acid and phosphoric acid (volume ratio 1:1), the amount added It is 0.1% of the total system mass, and the temperature is raised while stirring, and the appropriate time and pressure are controlled until the reactant in the four-necked flask changes from a white turbid liquid to a clear liquid, and the distillate is collected.

[0038] Step 2: After reacting for a period of time, take out a certain volume of reaction mixed liquid, neutralize it to pH 7, add Fehling's reagent to the mixed liquid, and heat it in a boiling water bath for 2 minutes. If many brick red precipitates are formed, it means synthesis The reaction is not completely over, and the reaction should be continued until a small amount of brick-red precipitate is formed...

Embodiment 2

[0043] Example 2 Preparation of tetradecyl lactoside:

[0044]Step 1: Add 8 mol of n-tetradecyl alcohol and 1 mol of galactose (slowly and in batches) into the reactor, heat up to 125°C, and after stirring evenly, add catalyst concentrated sulfuric acid and phosphoric acid (volume ratio 1:1), add The amount is 0.5% of the total system mass, and the temperature is raised while stirring, and the appropriate time and pressure are controlled until the reactant in the four-necked flask changes from a white turbid liquid to a clear liquid, and the distillate is collected.

[0045] Step 2: After reacting for a period of time, take out a certain volume of reaction mixed liquid, neutralize it to pH 8, add Fehling's reagent to the mixed liquid, and heat it in a boiling water bath for 2 minutes. If a lot of brick red precipitates are formed, it means synthesis The reaction is not completely over, and the reaction should be continued until a small amount of brick-red precipitate is form...

Embodiment 3

[0048] Example 3 Chemical agents used to release reservoir water lock effect during oil and gas field development

[0049] include:

[0050] 0.01 wt% cationic polyacrylamide, the molecular weight of the cationic polyacrylamide is between 2 million and 3 million;

[0051] Lauryl glucoside 73.99wt%;

[0052] Ethylene glycol butyl ether 25wt%;

[0053] 25-40nm nanocrystalline cellulose 1wt%.

[0054] Preparation method: mix cationic polyacrylamide, dodecyl glucoside, ethylene glycol butyl ether, and 25-40nm nanocrystalline cellulose uniformly according to the proportion.

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Abstract

The invention provides a water lock releasing agent for oil and gas reservoirs, wherein the chemical agent comprises cationic polyacrylamide, alkyl glycoside, glycol ether substances and nano crystalline cellulose, the nano crystalline cellulose accounts for 1-3% of the total mass, and the glycol ether substances account for 25-40% of the total mass. The cost of the water lock releasing agent is relatively low; production process is simple, raw material sources are wide, the water lock releasing agent can be obtained by direct mixing; the water lock releasing agent is simple in use method, isprepared from the raw materials safe to the environment, and has excellent effects of reducing surface tension and solubilizing, so that the flowing resistance caused by the fact that water enters anoil layer and immerses into a stratum can be eliminated or reduced, crude oil and natural gas can easily flow to the bottom of a well, and the oil-gas yield is increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a dehydration and locking agent for oil and gas reservoirs and a preparation method thereof. Background technique [0002] In the development of oil and gas fields, extraction operations are often required. During drilling, well completion, workover and production operations, there are many instances where foreign phases are trapped in porous media. Another immiscible phase infiltrates into the reservoir; or the saturation of the original immiscible phase in the porous medium increases, which will damage the relative permeability, so that the permeability of the reservoir and the relative permeability of oil and gas are significantly reduced. When this immiscible phase is an aqueous phase, this phenomenon is called water locking. [0003] The water-locking effect will produce water-locking damage, that is, the damage caused by water immersion into the oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/10
Inventor 张瀚澜赵彪李健王鹏程沈席伟马锐
Owner XIAN AODE PETROCHEM ENG TECH CO LTD
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