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Single-fluid process based silicate water shutoff agent and preparation method

A technology of silicate and water blocking agent, which is applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of shortened reaction time, unfavorable on-site construction, etc., and achieves low cost, stable shape and high strength. Effect

Inactive Publication Date: 2018-10-09
吉林石油集团兴业石油化学技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for low-temperature formations, but not for medium-high temperature formations
And when the reaction temperature is higher than 40°C, the reaction time is greatly shortened, which is not conducive to on-site construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: A kind of single-liquid method silicate water blocking agent and its preparation method, raw materials and mass percentage are as follows: modulus is 50% of water glass of 3.1-3.4, ethyl acetate 4%, filter reducer 2%, hydrogen Sodium oxide 2%, thickener 0.3%, water is the balance.

[0019] According to the ratio, add water, sodium hydroxide, and filter reducer to the preparation device, stir on a magnetic stirrer for 0.5 hours, and the speed of the stirrer is 200r / min; add water glass to the preparation device, and the speed of the stirrer is 200r / min , add the thickener after a vortex appears in the preparation device, stir for 0.5 hours, add ethyl acetate while stirring, and stir for 0.5 hours after the addition, to obtain a single-liquid silicate water blocking agent.

[0020] Method of use: The obtained single-liquid silicate water blocking agent is stored and transported by tank truck, and directly constructed on site.

[0021] The water shutoff agen...

Embodiment 2

[0023] Embodiment 2: A kind of single-liquid method silicate water blocking agent and its preparation method, raw materials and mass percentage are as follows: modulus is 52.5% of water glass of 3.1-3.4, formamide 3.5%, filter reducer 1.75%, hydrogen oxidation Sodium 1.75%, thickener 0.25%, water as the balance.

[0024] According to the ratio, add water, sodium hydroxide, and filter reducer to the preparation device, stir on a magnetic stirrer for 0.5 hours, and the speed of the stirrer is 200r / min; add water glass to the preparation device, and the speed of the stirrer is 200r / min , after the vortex appears in the preparation device, add the thickener, stir for 0.5 hours, add formamide while stirring, and stir for 0.5 hours after the addition, to obtain a single-liquid silicate water blocking agent.

[0025] The water shutoff agent prepared in this embodiment, after testing, the viscosity of the water shutoff agent is 60mpa s,

[0026] Put it in a water bath at 60°C to obse...

Embodiment 3

[0029] Embodiment 3: A kind of single-liquid method silicate water blocking agent and its preparation method, raw materials and mass percentage are as follows: modulus is 55% of water glass of 3.1-3.4, formamide 3%, filter reducer 1.5%, hydrogen oxidation Sodium 1.5%, thickener 0.2%, water as the balance.

[0030] According to the ratio, add water, sodium hydroxide, and filter reducer to the preparation device, stir on a magnetic stirrer for 0.5 hours, and the speed of the stirrer is 200r / min; add water glass to the preparation device, and the speed of the stirrer is 200r / min , after the vortex appears in the preparation device, add the thickener, stir for 0.5 hours, add formamide while stirring, and stir for 0.5 hours after the addition, to obtain a single-liquid silicate water blocking agent.

[0031] The water shutoff agent prepared in this example has a viscosity of 90mpa·s after testing. Put it in an 80°C water bath to observe the reaction time, and a colloid was formed ...

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Abstract

The invention provides a single-fluid process based silicate water shutoff agent and a preparation method. The water shutoff agent is prepared from the following materials in parts by mass, 50-55% ofwater glass, 3-4% of curing agents, 1.5-2% of filtrate loss reducers, 1.5-2% of enhancers, 0.2-0.3% of thickener and the balance of water. The single-fluid process based silicate water shutoff agent and the preparation method have the advantages that the cost of the prepared water shutoff agent is 76% of that of water shutoff agents TP910 and 10.56% of that of phenolic resin type water shutoff agents; the water shutoff effect is good, and the maximum bearing pressure is 20MP, 22MPa and 25MPa respectively at the temperatures of 30 DEG C, 60 DEG C and 80 DEG C; multiple production methods can beselected, and actual production and use can be adjusted in time; the obtained water shutoff agent system is stable; field operations are simple; the prepared water shutoff agent is carried to a construction site by a tank car for the water shutoff agent, and is pumped into the stratum during construction directly; generated colloids have high strength, stable shape and small shrinkage deformation, and permeable layers can be sealed for a long time.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a single-liquid method silicate water blocking agent and a preparation method. Background technique [0002] In the middle and late stages of oilfield development, the injected water rushes along the high-permeability layer, and the low-permeability oil layer is repeatedly artificially fractured, and the degree of water flooding of each sedimentary unit of the oil layer is serious. The water cut of the oil well rises, and the oil well floods prematurely. In the past, the double liquid water plugging method was commonly used in oilfields. Two different chemical working fluids are used, separated by spacer fluid, alternately injected into the formation, and moved for a certain distance in the formation. The two chemical working fluids contact and produce physical and chemical effects to produce plugging substances. It is impossible for the two chemical agents to be in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514
Inventor 牛全宇于洋邓宏超杜林孙敬文
Owner 吉林石油集团兴业石油化学技术服务有限公司
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