Chromium-free crosslinking system

A chromium cross-linking and system technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as toxicity and unfriendly environment, achieve good gel-forming properties, wide application conditions, dosage and flexibility high effect

Inactive Publication Date: 2014-04-02
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But chromium metal is not friendly to the environment and is toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1, at 50°C, in 500g of on-site water, slowly add 1.5g of polyacrylamide under electric stirrer 400r stirring, stir for 2h, add 1.0g of aluminum citrate, stir for 15min, then add 0.75g of thiourea, Stir for 15 minutes, the pH of the aqueous solution is 6.9, and when the gelation time is 2 hours, the gelation strength is 10000mPa·s.

Embodiment 2

[0011] Example 2, at 100°C, in 500g of on-site water, slowly add 2.5g of polyacrylamide under electric stirrer 400r stirring, stir for 2h, add 1.5g of polyhydroxymelamine etherate, stir for 15min, then add 2.5g of sulfur Urea, stirred for 15min, the pH of the aqueous solution is 8.0, and the gelling time is 2h, the gelling strength is 8000mPa·s.

Embodiment 3

[0012] Example 3, under the condition of 130°C, in 500g of sodium chloride water, slowly add 1.75g ​​of polyacrylamide under electric stirrer 400r stirring, stir for 2h, add 1.75g ​​of low cross-linking degree phenolic resin, stir for 15min, then add 1.75g ​​of thiourea, stirred for 15min, the pH of the aqueous solution is 6.7, and when the gelling time is 2h, the gelling strength is 8000mPa·s.

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PUM

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Abstract

The invention provides a chromium-free crosslinking system which comprises the following components in percentage by weight: 0.2-0.6wt% of crosslinking agent host, 0.1-0.3wt% of additive, 0.3-0.6wt% of polymer and the balance of water. The crosslinking agent can be aluminium citrate, polyhydroxymelamine etherate and low-crosslinking degree phenolic resin; the additive is thiourea; and the polymer is polyacrylamide. The chromium-free crosslinking system provided by the invention has the beneficial effects that the formed gel has certain viscosity and strength as well as fluidity and stability under certain pressure.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and in particular relates to a chrome-free crosslinking system. Background technique [0002] In recent years, polymer cross-linking technology has developed rapidly, and many different cross-linking agent products have come out and have been widely used in oil fields. [0003] Cross-linking agents with different structures, properties, production processes, and prices have occupied a place in the field of oilfield chemistry, and have also promoted the development of domestic oilfield chemical agents. The crosslinking agents used include aldehyde resins, polyvalent metal ions, and the like. Aldehyde and resin crosslinking agents are generally difficult to form gels at temperatures below 40°C or take a long time to form gels, and the gel strength formed by low polymer concentrations is not high; The glue strength is high, but the gelation time is short and the operability is poor. [000...

Claims

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Application Information

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IPC IPC(8): C09K8/44
CPCC09K8/512C09K8/5083
Inventor 胡玉国梁海臣李靖张冠洲张有强肖劲松赵兴君
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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