Nanometer starch microsphere filtrate reducer for water-based drilling fluid, preparation method thereof and water-based drilling fluid

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low temperature resistance and poor fluid loss control, and achieve good plugging effect and preparation The effect of simple process and wide range of sources

Active Publication Date: 2019-06-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a nano starch microsphere fluid loss control agent for water-based drilling fluid in order to overcome the defects of poo

Method used

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  • Nanometer starch microsphere filtrate reducer for water-based drilling fluid, preparation method thereof and water-based drilling fluid
  • Nanometer starch microsphere filtrate reducer for water-based drilling fluid, preparation method thereof and water-based drilling fluid
  • Nanometer starch microsphere filtrate reducer for water-based drilling fluid, preparation method thereof and water-based drilling fluid

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preparation example Construction

[0025] The second aspect of the present invention provides a kind of preparation method of aforementioned nano-starch microsphere fluid loss control agent for water-based drilling fluid, wherein, the method comprises the following steps:

[0026] (1) carrying out first contact with starch and alkaline solution to obtain dispersed phase;

[0027] (2) Carry out second contact with continuous phase oil and emulsifier to make continuous phase;

[0028] (3) adding the dispersed phase dropwise to the continuous phase to form a microemulsion, and then reacting under the conditions that the initiator and the crosslinking agent exist;

[0029] (4) centrifuging the reactant obtained through step (3).

[0030]According to the present invention, in step (1), the starch can be starch that is generally applicable in this field, for example, can be natural plant starch; preferably, the starch is selected from wheat starch, corn starch, sorghum starch, potato starch One or more in starch or...

preparation example

[0051] In the following preparations:

[0052] (1) Determination of average particle size

[0053] The average particle size distribution of nano-starch microspheres was tested by NanoBrookomni multi-angle particle size and high-sensitivity Zeta potential analyzer (Brookhaven, USA).

[0054] The test method is as follows: the nano-starch microspheres are added into deionized water to prepare a 0.1% suspension, and the test is carried out immediately after ultrasonic dispersion for 10 minutes. The ASAP2020M specific surface area and microporous physical adsorption analyzer from Micromeritics Company of the United States was used to test and analyze the specific surface area and total pore volume of the samples.

[0055] (2) Determination of swelling degree

[0056] The test method is: weigh 0.5g of the sample, add 25mL of distilled water, put it in a 100mL beaker, stir it slightly, put it in a constant temperature water bath at 82-85°C to swell for 2min, take it out and cool ...

Embodiment 1

[0059] This embodiment is to illustrate the nano starch microsphere fluid loss control agent prepared by the method of the present invention.

[0060] (1) Preparation of dispersed phase: 5 g of mung bean starch was added to 40 mL of NaOH solution with a concentration of 2 mol / L, heated to 80 °C under stirring and kept at a stable temperature for 30 min, and then lowered to 50 °C.

[0061] (2) Preparation of the continuous phase: Add 6 g of emulsifier Span-20 and 2 g of emulsifier OP-10 into 160 mL of octane, and heat to 50° C. under magnetic stirring to dissolve.

[0062] (3) Add the dispersed phase to the continuous phase dropwise to form a uniform emulsion, then cut it with an emulsifying shearer at 6000rpm for 30s, then transfer it to a three-necked flask, feed nitrogen, control the reaction temperature of the water bath to 55°C, and the stirring speed 600rpm, after stirring for 30min, add 1g of sodium trimetaphosphate, after another 10min, add 0.5g of ammonium persulfate a...

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Abstract

The invention relates to the field of petroleum engineering oilfield chemistry and discloses a nanometer starch microsphere filtrate reducer for a water-based drilling fluid, a preparation method thereof and the water-based drilling fluid. The nanometer starch microsphere filtrate reducer is prepared by dropwise adding a starch-containing alkaline solution into a continuous phase containing continuous phase oil and emulgator under the existence of cross-linking agent and initiator, reacting and centrifugally separating. The nanometer starch microsphere filtrate reducer is characterized by average grain diameter of 50-1000nm, swelling degree of 200-600%, total pore space volume of 0.5-4mL/g and capacity of resisting against temperature at 150 DEG C or above. According to the invention, thenanometer starch microsphere is used as a filtrate reducer, so that the leak-off of drilling fluid can be more effectively controlled, and meanwhile, temperature resistance can be obviously promoted,influence on viscosity of drilling fluid is smaller, and an excellent blocking effect to micropores and cracks on floor can be achieved. The nanometer starch microsphere has the advantages of biodegradability, environment-friendly property, extensive source and simple preparation process.

Description

technical field [0001] The invention relates to the field of petroleum engineering oilfield chemistry, in particular to a nano starch microsphere fluid loss reducer for water-based drilling fluid, a preparation method thereof and a water-based drilling fluid. Background technique [0002] During the drilling process, under the action of the pressure difference between the drilling fluid column pressure and the formation pressure, the free water in the drilling fluid permeates into the cracks or pores of the well wall rock, which is called the fluid loss of the drilling fluid. During the fluid loss process, as the free water in the drilling fluid enters the formation, the solid phase particles in the drilling fluid will adhere to the well wall to form a mud cake, which is the fluid loss wall-building property of the drilling fluid. The fluid loss wall-building property of drilling fluid is closely related to the safety of drilling construction. A large amount of fluid loss wi...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24
Inventor 钟汉毅邱正松陈思琪周国伟李佳高鑫刘云峰汤志川
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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