Nano starch filtrate reducer for drilling fluid and preparation method thereof

A technology of nano-starch and filtrate reducing agent, applied in chemical instruments and methods, drilling composition, etc., can solve the problem of the large influence of drilling fluid system viscosity, less research on drilling fluid application, and poor temperature resistance of treatment agents, etc. problems, to achieve the effect of reducing drilling fluid filtration, optimizing process methods, and wide application range

Active Publication Date: 2018-08-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a drilling fluid treatment agent, because of its strong salt resistance, it can be used as a fluid loss reducer for saturated brine drilling fluid. However, this type of treatment agent has poor temperature resistance and has a greater impact on the viscosity of the drilling fluid system. It is easy to ferment when it is high, and generally it can only be used below 130°C, which limits its

Method used

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  • Nano starch filtrate reducer for drilling fluid and preparation method thereof
  • Nano starch filtrate reducer for drilling fluid and preparation method thereof
  • Nano starch filtrate reducer for drilling fluid and preparation method thereof

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preparation example Construction

[0057] The invention provides a preparation method of nano starch fluid loss reducer for drilling fluid, comprising the following steps:

[0058] S1, preparation of nano starch

[0059] Add 10-40 parts by mass of starch to 50-200 parts by mass of water, let stand at 5-10°C for 4-12 hours, and ultrasonically pulverize for 1-3 hours at <25°C, filter and take the filter cake to obtain the Need nano starch;

[0060] Standing for a period of time under a low temperature and constant temperature environment can make starch granules easier to be crushed by ultrasonic waves.

[0061] Place the static suspension in a 600-900W high-power ultrasonic pulverizer, and perform ultrasonic pulverization at <25°C to prevent starch granules from being unstable due to excessive temperature; the purpose of ultrasonic pulverization is to control starch granules Diameter, and then control the particle size of the final product fluid loss control agent, and the size of the particle size of the flui...

Embodiment 1

[0102] (1) Add 10 parts by mass of cornstarch to 50 parts by mass of water to prepare a suspension, and place it in a constant temperature environment at 5°C for 8 hours;

[0103] (2) Using a high-power ultrasonic pulverizer, the power is adjusted to 900W, and the suspension is ultrasonically pulverized for 1 hour in an environment < 25°C, and after filtration, the filter cake is taken to obtain the required nano starch;

[0104] (3) Add the nano starch into the stirrer, add 50 parts by mass of ethanol, heat to 40°C, feed nitrogen and stir;

[0105] (4) After stirring evenly, add 5 parts by mass of sodium hydroxide and 5 parts by mass of 3-chloro-2-hydroxypropanesulfonate sodium, react for 1 hour, and vacuum filter after the reaction is completed to obtain a filter cake;

[0106] (5) After washing the filter cake several times with ethanol, add it to 50 parts by mass of ethanol, heat to 60° C., feed nitrogen and stir at the same time, to obtain an etherification-modified nano-st...

Embodiment 2

[0119] (1) Add 30 parts by mass of tapioca starch to 180 parts by mass of water to prepare a suspension, and place it in a constant temperature environment at 8°C for 4 hours;

[0120] (2) Adopt a high-power ultrasonic pulverizer, adjust the power to 800W, and in the environment of <25°C, ultrasonically pulverize the suspension for 2.5 hours, and take the filter cake after filtration to obtain the required nano-starch;

[0121] (3) Add the nano starch into the stirrer, add 80 parts by mass of methanol, heat to 50° C., feed nitrogen and stir;

[0122] (4) After stirring evenly, add 10 parts by mass of sodium hydroxide and 20 parts by mass of sodium chloroacetate, react for 2 hours, and vacuum filter after completion of the reaction to obtain a filter cake;

[0123] (5) After washing the filter cake several times with ethanol, add it to 80 parts by mass of methanol, heat to 70° C., feed nitrogen and stir at the same time, to obtain an etherification-modified nano-starch suspensi...

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Abstract

The invention discloses a nano starch filtrate reducer for drilling fluid and a preparation method thereof. The preparation method includes steps: S1, preparing nano starch; S2, preparing etherified and modified nano starch; S3, preparing a nano starch filtrate reducer coarse product; S4, purifying to obtain the nano starch filtrate reducer. The nano starch filtrate reducer can obviously lower normal-temperature API filter loss of basic mud and high-temperature high-pressure filter loss and is extensive in application range, and nano starch particles can be completely biodegraded, thereby being nontoxic and harmless to environment and excellent in environment protection performance. The filtrate reducer is reliable in preparation principle, controllable in reaction condition and low in cost of raw materials for preparation, and drilling engineering cost is lowered.

Description

technical field [0001] The invention relates to the field of improving natural polymer materials, in particular to a nano starch fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the wellbore wall, causing the drilling fluid to lose water. As the water enters the formation, the clay particles in the drilling fluid adhere to the well wall to form a "filter cake", forming a filter cake well wall. Since the well wall of the filter cake is much denser than the original well wall, on the one hand, it prevents the drilling fluid from further dehydration, and on the other hand, it plays a role in protecting the well wall. However, during the formation of the filter cake wall, too much water is lost by filtration, the filter cake is too thick, and fine clay particles enter the formation with ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08B30/02C08B31/12C08B31/10
Inventor 邱正松周国伟钟汉毅王帝
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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