A kind of low-permeability reservoir dewatering and locking agent and preparation method thereof

A water-blocking agent and low-permeability technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of limited application range, difficult to take into account low-permeability reservoir geology, reservoir conditions and construction techniques, and release water-locking damage Unsatisfactory effect and other problems, to achieve the effect of wide application range, release of water lock damage, and strong surface activity

Active Publication Date: 2014-10-29
唐山冀油瑞丰化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems that a single type of water-blocking agent is difficult to take into account factors such as geology, reservoir conditions and construction techniques of low-permeability reservoirs, the effect of releasing water-locking damage is not ideal, and the scope of application is limited. The first aspect of the present invention is to provide a surface It is a low-permeability oil reservoir water-blocking agent with strong activity, which makes it easy to flow back into the well fluid, effectively relieves water-locking damage, and maintains the permeability of the reservoir; the second is to provide a preparation method for low-permeability oil reservoir water-blocking agent

Method used

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Examples

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Effect test

Embodiment 1

[0012] This example discloses a low-permeability oil reservoir dewatering and locking agent and its preparation method. The low-permeability oil reservoir dewatering and locking agent is composed of 50 g ethylene glycol butyl ether, 90 g N,N'-bis(dodecane Base) sodium ethylenediaminodipropionate, 70g ethylene glycol triethylsilyl ether, 160g distilled water. The specific preparation method is:

[0013] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 160g of distilled water, put a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, turn on the magnetic stirrer, turn on the heating switch, and the temperature Control at 30-40°C, turn on the cooling water of the reflux condenser; add 50 g of ethylene glycol butyl ether, then add 90 g of N,N'-bis(dodecyl)ethylenediaminodipropionate, and react for 1 hour . Add 70g of ethylene glycol triethylsilyl ether, control the temperature at 70-80°C, and reac...

Embodiment 2

[0015] This embodiment discloses a low-permeability oil reservoir dewatering and locking agent and a preparation method thereof. By mass, this low-permeability oil reservoir dehydrating and locking agent is prepared by adding 50 g of polyethylene glycol methyl ether, 115 g of N,N'-di(dodecyl Alkyl) sodium ethylenediaminodiacetate, 56g ethylene glycol trimethylsilyl ether, 140g distilled water. The specific preparation method is:

[0016] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 140g of distilled water, put a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, turn on the magnetic stirrer, turn on the heating switch, and the temperature Control at 30-40°C, turn on the cooling water of the reflux condenser; add 50 g of polyethylene glycol methyl ether, then add 115 g of N,N'-bis(dodecyl)ethylenediaminodiacetate, and react for 1 hour . Add 56g of ethylene glycol trimethylsilyl ether, cont...

Embodiment 3

[0018] This embodiment discloses a low-permeability oil reservoir dewatering and locking agent and a preparation method thereof. By mass, this low-permeability oil reservoir dehydrating and locking agent consists of 35 g diethylene glycol ether, 80 g N,N'-bis(dodecyl ) butanediaminodipropionate sodium, 75g polyethylene glycol trimethylsilyl ether, and 150g distilled water. The specific preparation method is:

[0019] In a four-necked 500ml flask with a reflux condenser, a thermometer, and a dropping funnel, add 150g of distilled water, put a stirring magnet, put the flask into a magnetic stirrer with an electric heating jacket, turn on the magnetic stirrer, turn on the heating switch, and the temperature Control at 30-40°C, turn on the cooling water of the reflux condenser; add 35 g of diethylene glycol ether, then add 80 g of N·Nˊ-dodecyl-ethylenediamine dipropionate, and react for 1 hour. Add 75g of polyethylene glycol trimethylsilyl ether, control the temperature at 65-75°...

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Abstract

The invention discloses an oil field chemical agent used in petroleum gas oil-pumping operation construction, and particularly relates to a low-permeability reservoir water-lock releasing agent used in working fluid and a preparation method thereof. The low-permeability reservoir water-lock releasing agent consists of the following components in percentage by weight: 1 to 15 percent of glycol ether, 15 to 45 percent of didodecyl dicarboxylic sodium, 15 to 30 percent of ethylene glycol silicon ether and 30 to 60 percent of water. The preparation method comprises the following steps of: adding 30 to 60 percent of water into an enamel reaction kettle, starting a stirrer, and heating to raise the temperature to be between 30 and 40 DEG C; adding 1 to 15 percent of glycol ether and 15 to 45 percent of didodecyl dicarboxylic sodium into the reaction kettle, controlling the temperature and stirring for 1 hour; and adding 15 to 30 percent of ethylene glycol silicon ether into the reaction kettle, controlling the temperature to be between 40 and 80 DEG C, and reacting for 1 to 2 hours to obtain the water-lock releasing agent. The water-lock releasing agent is strong in surface activity and low in use level, can well maintain the permeability of a low-permeability reservoir and release water-lock damages, and is used in the working fluid such as fracturing fluid, perforating fluid, well control fluid and the like.

Description

Area of invention [0001] The present invention involves an oil field chemical agent used in the construction of oil and gas picking in oil and gas, especially a low -lying oil collection unlocking agent and its preparation method.middle. Background technique [0002] Low permeable oil collection generally has the characteristics of high capillary pressure, strong hydritativetability, small pore throat, poor permeability, and severe non -average quality.During the oil mining process, the water -phase capillary tube is prone to self -suction, resulting in a large amount of well -entering fluid into the collection.The poor penetration of the low osmotic pumping pumps makes it difficult to return the inlet liquid in the inhumage collection.Studies at home and abroad have shown that water lock damage is the most important and serious type of damage in low penetration of oil collection. The damage rate is generally 70%to 90%. Once damaged, the recovery of the pians of oil is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/86C09K8/035
Inventor 乔孟占何水良彭通张强赵娜
Owner 唐山冀油瑞丰化工有限公司
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