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Block up and concoction agnet of inorganic delayed siliceous gel

A silicic acid gel, inorganic technology, used in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve problems such as uneven mixing of plugging and adjusting agents, inability to meet construction requirements, and excessive gelation speed. , to overcome the effects of short gelling time, low cost and prolonged gelling time

Inactive Publication Date: 2005-01-12
中国石油化工股份有限公司河南油田分公司石油工程技术研究院
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AI Technical Summary

Problems solved by technology

The two-liquid method has the disadvantages of uneven mixing of the plugging agent in the formation, insufficient reaction, and poor effect. The use of the single-liquid method tends to cause the gelling speed of the plugging agent to be too fast. Usually, it is better to carry out profile control of the percolation surface in the formation below 70 °C Water plugging, when the ground temperature is higher than 70°C, the application is limited due to the fast glue formation of plugging and adjustment, which cannot meet the construction requirements
Chinese patent application (publication number is CN1097451A) discloses a kind of alkaline silicic acid gel profile control agent used for profile control of oilfield water injection wells, although it has the advantages of convenient construction, little corrosion to equipment, good profile control effect and low cost Advantages, but its gelling speed is too fast, and it can only be used in formations below 70°C

Method used

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  • Block up and concoction agnet of inorganic delayed siliceous gel
  • Block up and concoction agnet of inorganic delayed siliceous gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Water glass (modulus>2.8) 5%, ethyl acetate 0.1%, acetamide (or formamide, carbonamide) 3%, ethanol (or methanol) 0.1%.

Embodiment 2

[0020] Example 2: Water glass (modulus>2.8) 15%, methyl acetate 0.6%, acetamide (or formamide, carbonamide) 0.1%, ethanol (or methanol) 0.3%.

Embodiment 3

[0021] Example 3: Water glass (modulus>2.8) 8%, methyl acetate 0.3%, acetamide (or formamide, carbonamide) 2.0%, ethanol (or methanol) 0.2%.

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Abstract

A blocking and regulating agent for organic delay silicic gel is prepared by adding at least one of ethyl acetate, acetamide and alcohol as delay activator into master material of sodium silicate solution. The said acetamide can be replaced by formamide or carbomite and alcohol can be replaced by methanol or sometime ammonium chloride can be added.

Description

1. Technical Field [0001] The invention relates to the application field of oil field chemistry, in particular to an inorganic delayed silicic acid gel plugging adjustment agent used for oil well water shutoff and water well profile control in oil fields. 2. Background technology [0002] At present, the silicic acid gel plugging and adjusting agent used in the water plugging and profile control of oil and water wells in domestic oilfields includes two types of acid gel and alkaline gel. There are also two methods of single-liquid method and two-liquid method in the injection process. The two-liquid method has the disadvantages of uneven mixing of the plugging agent in the formation, insufficient response, and poor effect. The single-liquid method is easy to make the plugging agent gelatinize too fast, and it is usually suitable to perform percolation surface profile adjustment in the formation below 70℃ For water blocking, when the ground temperature is higher than 70°C, the app...

Claims

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Application Information

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IPC IPC(8): E21B33/12
Inventor 路群祥黄青松张文玉贾丽云刘志勤
Owner 中国石油化工股份有限公司河南油田分公司石油工程技术研究院
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