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Selective water blockoff agent and preparation thereof

A water shutoff agent, selective technology, applied in chemical instruments and methods, earth drilling, mining fluids, etc., can solve the problems of poor mechanical shear stability, low thermal degradation and salt resistance, and achieve good shear stability , Enhanced oil recovery and low base fluid viscosity

Inactive Publication Date: 2009-05-27
王纯连
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of polyacrylamide, there are functional defects such as poor mechanical shear stability, obvious thermal degradation, and low salt resistance.
Scholars from various countries are constantly discussing and making some progress on the copolymerization of polyacrylamide and some salt-resistant and temperature-resistant monomers or the modification by chemical synthesis methods, but at present, a large number of excellent selective water shutoff agents are required to be put into application in oil fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation method of selective water blocking agent

[0025] 1) Weigh 39.6 kg of polyacrylamide, 61.3 kg of hexamethylenetetramine, 3.1 kg of N, N-methylenebisacrylamide, 0.015 kg of ammonium persulfate, methacryloyloxyethyl trimethyl chloride 3.2 kilograms of amines are put into the mixer and start stirring;

[0026] 2) 2.5 kg of hydroxypropyl oxymethyl cellulose is pulverized and ground, and added into a mixer to continue stirring;

[0027] 3) Weigh 13.7 kg of diethylenetriamine, slowly add it into the mixer under stirring, continue stirring for 30 minutes, put the finished product into a plastic bag and seal it for storage.

[0028] 2. Method for preparing selective water shutoff agent solution at oil field construction site

[0029] 1) Use a liquid distribution tank with a high-speed stirring device at the dispensing station of the oil production plant, put in 100 kg of warm water at 50-70 ° C, start stirring to make the water form a vortex, weigh 1 kg of sele...

Embodiment 2

[0033] 1. Preparation method of selective water blocking agent

[0034] 1) Weigh 38 kg of polyacrylamide, 65 kg of hexamethylenetetramine, 2 kg of N,N-methylenebisacrylamide, 0.03 kg of ammonium persulfate, methacryloyloxyethyl trimethyl chloride 3 kilograms of amines are put into the mixer and start stirring;

[0035] 2) Grinding 3 kg of hydroxypropyloxymethyl cellulose, adding it into a mixer and continuing to stir;

[0036] 3) Weigh 6 kg of diethylenetriamine, slowly add it into the mixer under stirring, continue stirring for 30 minutes, put the finished product into a plastic bag and seal it for storage.

[0037] 2. Method for preparing selective water shutoff agent solution at oil field construction site

[0038] 1) Use a liquid distribution tank with a high-speed stirring device at the dispensing station of the oil production plant, put in 100 kg of warm water at 50-70 ° C, start stirring to make the water form a vortex, weigh 1 kg of selective water blocking agent, an...

Embodiment 3

[0042] 1. Preparation method of selective water blocking agent

[0043] 1) Weigh 48 kg of polyacrylamide, 49 kg of hexamethylenetetramine, 4 kg of N, N-methylenebisacrylamide, 0.01 kg of ammonium persulfate, methacryloyloxyethyl trimethyl chloride 6 kilograms of amines are put into the mixer and start stirring;

[0044] 2) Grinding 1 kg of hydroxypropyloxymethylcellulose, adding it into a mixer and continuing to stir;

[0045] 3) Weigh 15 kg of diethylenetriamine, slowly add it into the mixer under stirring, continue stirring for 30 minutes, put the finished product into a plastic bag and seal it for storage.

[0046] 2. Method for preparing selective water shutoff agent solution at oil field construction site

[0047] 1) Use a liquid distribution tank with a high-speed stirring device at the dispensing station of the oil production plant, put in 100 kg of warm water at 50-70 ° C, start stirring to make the water form a vortex, weigh 1 kg of selective water blocking agent, a...

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PUM

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Abstract

The invention discloses a selective water-plugging agent and a preparation method thereof. The selective water-plugging agent consists of the following raw materials by weight portion: 38 to 48 portions of polyacrylamide, 49 to 65 portions of hexamethyltetramine, 2 to 4 portions of N, N'-methylenebisacrylamide, 0.01 to 0.03 portion of ammonium persulfate, 3 to 6 portions of methacryloyloxyethyl trimethyl ammonium chloride, 1 to 3 portions of hydroxypropyl methyl cellulose, and 6 to 15 portions of diethylenetriamine. The invention also discloses the preparation method and a field use method for the selective water-plugging agent. The selective water-plugging agent can produce larger resistance to the flow of stratum water, ensure that the water phase permeability is greatly reduced, has small influence on the flow of crude oil, has the effect of plugging water and not plugging oil, can obviously improve the development efficiency of high water-cut oil wells, and improve the yield of the crude oil and the recovery ratio of oil pools.

Description

technical field [0001] The invention relates to special chemicals for oil field exploitation, in particular, the invention is a selective water shutoff agent. The invention also relates to a preparation method of the water blocking agent. Background technique [0002] Petroleum, as a non-renewable energy source, is becoming more and more valuable, the social demand is increasing, and the reserves are gradually decreasing. Paying attention to the technology of enhanced oil recovery and maximizing the extraction of crude oil remaining in the formation is the focus of petroleum research at home and abroad. In the middle and late stages of oilfield development, due to the heterogeneity of the formation and the long-term erosion of the injected water, the reservoir structure has changed, and the production oil wells have high water cut or extremely high water cut. At present, polyacrylamide (Polyacrylamide, referred to as "PAM") is widely used in polymer water blocking. Polyac...

Claims

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Application Information

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IPC IPC(8): C09K8/58E21B43/22
Inventor 王纯连苏向新陈家骥
Owner 王纯连
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