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Application of sclerotium rolfsii scleroglucan fermentation broth as oil field drilling fluid treatment agent

A scleroglucan, oil field drilling technology, applied in the directions of fermentation, drilling composition, microorganism-based method, etc., can solve the problem of not finding Sclerotinia scleroglucan fermentation liquid and the like, achieve good compatibility, The effect of high purity and ability to withstand harsh formation conditions

Active Publication Date: 2013-05-08
天津量信检验认证技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no application of Sclerotin scleroglucan fermentation liquid as an oilfield drilling fluid treatment agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of the Sclerotin scleroglucan fermentation liquid is an in-situ separation and fermentation method, and the steps are:

[0033] ⑴. Bacteria culture:

[0034] A 1000ml shake flask was used to cultivate the Sclerotinia seed solution in a constant temperature shaker. The components and mass percentages of the culture medium are: 4% sucrose, 0.3% sodium nitrate, 0.075% corn steep liquor, 0.075% yeast powder, 0.05% potassium chloride, 0.05% potassium dihydrogen phosphate, 0.05% magnesium sulfate heptahydrate %, the remainder is water, pH: 5.0. The temperature of the shaker was 30° C., the rotation speed of the shaker was 150 rpm, and the culture period was 48 hours.

[0035] ⑵. Using 30L fermenter to ferment Sclerotinia:

[0036] After the prepared fermentation medium is sterilized by a continuous sterilization device, it enters the fermenter after emptying and sterilizing. Sterilization conditions: 121°C, tank pressure: 1kg / cm 2 , the time is 20mi...

Embodiment 1

[0043] Mix the Sclerotin scleroglucan fermentation liquid with water according to the ratio of 10Kg and 90Kg of water to make an oilfield drilling fluid treatment agent. After testing, the Sclerotinia scleroglucan oilfield drilling fluid treatment agent prepared in the above ratio has a pH of 1- The viscosity remains unchanged under the condition of 13, and the pH range of xanthan gum, which is commonly used as oilfield products, is 3-11. Beyond this range, the viscosity drops by more than 30%, and the viscosity cannot be recovered. Therefore, as an oilfield drilling fluid treatment agent, Sclerotin scleroglucan is more suitable for oil well drilling with complex geological conditions.

Embodiment 2

[0045] Mix the Sclerotin scleroglucan fermentation broth with water at a ratio of 30Kg and 70Kg of water to make an oilfield drilling fluid treatment agent. After testing, the viscosity of the Sclerotinia scleroglucan oilfield drilling fluid treatment agent prepared in this ratio reaches 500cp , the viscosity recovery rate reaches 100% after high-shear stirring, and has good pseudoplasticity. However, polyacrylamide, which is also an oilfield product, will have a sharp drop in viscosity when stirred under high-shear force, and the viscosity cannot be recovered. , thus proving that Sclerotin scleroglucan has better pseudoplasticity than polyacrylamide.

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PUM

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Abstract

The invention relates to application of sclerotium rolfsii scleroglucan fermentation broth as an oil field drilling fluid treatment agent. The sclerotium rolfsii scleroglucan fermentation broth can be used in a stratum environment with a temperature of less than 130 DEG C, a mineralization degree of less than 20000 mg / L, and a pH value in a range of 1-12, overcomes adverse factors that current biopolymer products are poor in temperature resistance and easy to be influenced by the mineralization degree and the pH value of stratum, and is wider in application range, and stronger in capacity of resisting harsh stratum conditions.

Description

technical field [0001] The invention relates to a new application of a Sclerotin scleroglucan fermentation liquid, in particular to the application of a Sclerotinia scleroglucan fermentation liquid as an oilfield drilling fluid treatment agent. Background technique [0002] With the development of deep and offshore oil exploration and development in recent years, more and more deep wells, ultra-deep wells and special process wells are drilled. In response to the development of drilling fluid technology, oilfield chemists are constantly developing new drilling fluid treatment agents. Drilling fluids commonly used at present include the following categories: dispersed drilling fluids (Dispersed Drilling Fluids), oil-based drilling fluids (Oil-based Drilling Fluids), synthetic-based drilling fluids (Synthetic Drilling Fluids), gas-type drilling fluids (Gas —typed Drillg Fluids), polymer drilling fluids (Polymer Drillig Fluids). [0003] Dispersed drilling fluid (Dispersed Dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C12P19/08C12R1/645
Inventor 魏呐张英筠何雨青许勤虎王祥河温冰程伟吴頔刘阳王珺郭伟
Owner 天津量信检验认证技术有限公司
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