High temperature resistant modified starch filtration reducing agent and preparation method thereof

A fluid loss reducer, high temperature resistance technology, applied in chemical instruments and methods, drilling composition, fermentation, etc., can solve the problem that the temperature resistance ability is difficult to exceed 140 ℃, the salt resistance and calcium resistance are poor, and the scope of use is limited. and other problems, to achieve the effect of simple and easy preparation method, improved temperature resistance, mild and controllable reaction conditions

Inactive Publication Date: 2013-11-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the temperature exceeds 120°C, starch will fail due to high-temperature degradation, which greatly limits its application range.
At present, the method of improving the temperature resistance of starch fluid loss additives is mainly achieved by grafting polyvinyl monomers and etherification, but these modified starch fluid loss additives in freshwater drilling fluid It is still difficult to break through the temperature resistance of 140°C, and there are few domestic and foreign modified starch fluid loss reducer products that can resist the temperature of 140°C, and their salt and calcium resistance performance is poor under high temperature conditions

Method used

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  • High temperature resistant modified starch filtration reducing agent and preparation method thereof
  • High temperature resistant modified starch filtration reducing agent and preparation method thereof
  • High temperature resistant modified starch filtration reducing agent and preparation method thereof

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preparation example Construction

[0031] A preparation method of high temperature resistant modified starch fluid loss reducer, comprising:

[0032] Dissolve alkenyl amide and alkenyl sulfonate in deionized water solvent, and adjust the pH of the solution to 6.0-8.0 with 2.0wt% NaOH or KOH aqueous solution to obtain a mixed monomer solution with a concentration of 20.0wt%-50.0wt% ;

[0033] Add the oil phase solution and the nonionic surfactant into the reactor, stir and mix to obtain an emulsion with a lipophilic and hydrophilic balance value HLB ranging from 7.0 to 9.0;

[0034] Add the enzyme-degraded starch emulsion into the emulsion, add phenolic compounds, biological enzymes and reducing substrates, and stir evenly to obtain a microemulsion with an oil / water volume ratio of 2 to 5:1;

[0035] Slowly raise the temperature of the microemulsion to 20-86°C within 0.5-3.0 hours, and mix the monomer solution with a concentration of 20.0wt%-50.0wt% and the hydrogen acceptor base whose molar weight is 0.2-1.0 t...

Embodiment 1

[0038] Add 40 g of cornstarch into a beaker filled with 100 mL of distilled water, stir well to form a paste, pour it into a reactor, and heat it in a water bath at 65°C. Under the condition of stirring, add 0.04g α-amylase, keep at constant temperature for 120min, raise the temperature of oil bath to 110°C, keep at constant temperature for 60min, and obtain the enzyme-degraded starch emulsion.

[0039] Make a 15.0wt% solution of 2-acrylamido-2-methylpropanesulfonic acid in water, neutralize it with 50.0wt% KOH solution to pH=6.0, and dry it in a vacuum oven at 20°C until constant Heavy.

[0040] 5.61 g of acrylamide and 19.34 g of potassium 2-acrylamido-2-methylpropanesulfonate were dissolved in 60 mL of water, and the pH was adjusted to 7.5 with 2.0 wt % KOH aqueous solution to obtain a mixed monomer solution.

[0041]In a reactor equipped with a temperature control device, a reflux condensing device and a constant pressure feeding device, add 400 mL of cyclohexane, then ad...

Embodiment 2

[0045] Add 40g of tapioca starch into a beaker filled with 40mL of distilled water, stir well to form a paste, pour it into the reactor, heat it in a water bath at 96°C, add 0.008g of α-amylase under stirring conditions, keep the temperature for 120min, and raise the temperature The temperature of the oil bath was raised to 118° C., and kept at a constant temperature for 60 minutes to obtain the enzyme-degraded starch emulsion.

[0046] Prepare a 15.0wt% solution of styrene sulfonic acid in water, neutralize it with 50.0wt% NaOH solution to pH=6.0, and dry it in a vacuum oven at 20°C to constant weight.

[0047] Dissolve 6.61g of N,N-dimethylacrylamide and 20.62g of sodium p-styrenesulfonate in 100mL of water, and adjust the pH to 7.0 with 2.0wt% NaOH aqueous solution to obtain a mixed monomer solution.

[0048] In a reactor equipped with a temperature control device, a reflux condensing device and a constant pressure feeding device, add 480 mL of toluene, then add 26.91 g of ...

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Abstract

The invention discloses a high temperature resistant modified starch filtration reducing agent and a preparation method thereof. The modified starch filtration reducing agent and the preparation method comprise that: with starch, a phenolic compound, alkenyl amide and alkenyl sulfonic acid as raw materials, an oil phase solution as a continuous phase and a nonionic surfactant as an emulsifying agent, and under catalytic actions of a reduction substrate and a hydrogen acceptor substrate, a starch graft copolymer is generated through a reaction. The filtration reducing agent provided by the invention is resistant to temperature of up to 175 DEG C, and simultaneously also has good salt and calcium resistance capabilities; and the preparation method is simple and easy to implement, and has mild and controllable reaction conditions, high grafting efficiency, fast reaction speed and low cost.

Description

technical field [0001] The invention relates to a fluid loss reducer used in oil and gas drilling and a preparation method thereof, in particular to a modified starch fluid loss reducer and a preparation method thereof. Background technique [0002] With the continuous increase of the world's energy demand, the development of oil and gas resources in deep formations has become inevitable, which puts forward higher requirements for drilling technology. Drilling fluid technology is an important part of drilling technology, and its performance is directly related to drilling quality and drilling cost, and even drilling success or failure. The fluid loss performance of drilling fluid under high temperature and high pressure conditions in deep formations is an important part of the comprehensive performance of drilling fluids, and the control of drilling fluid fluid loss under high temperature and high pressure conditions is achieved by high temperature resistant fluid loss reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/58C08F220/56C08F212/14C08F220/54C08F2/30C12P19/14C09K8/035
Inventor 苏俊霖张容任茂王翔肖阳
Owner SOUTHWEST PETROLEUM UNIV
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