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Supramolecular material and preparation method thereof and application in soilless phase water-based drilling fluid as shearing potentiator

A water-based drilling fluid and supramolecular technology, applied in the field of oil and gas drilling, can solve problems affecting drilling speed, high product cost, complex synthesis process, etc., achieve good thixotropy and increase drilling speed

Active Publication Date: 2018-05-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the water-based drilling fluid cutting agents developed at home and abroad have problems such as the monomers used in the synthesis process are not environmentally friendly, the synthesis process is complicated, the product cost is high, and it is difficult to apply on a large scale.
In addition, these synthetic polymer shear-raising agents may be sheared and degraded at the water hole of the drill bit (high shear rate), and affect the drilling speed, making it difficult to obtain a water-based drilling fluid system with high rock-carrying capacity

Method used

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  • Supramolecular material and preparation method thereof and application in soilless phase water-based drilling fluid as shearing potentiator
  • Supramolecular material and preparation method thereof and application in soilless phase water-based drilling fluid as shearing potentiator
  • Supramolecular material and preparation method thereof and application in soilless phase water-based drilling fluid as shearing potentiator

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preparation example Construction

[0025] A second aspect of the present invention provides a method for preparing a supramolecular material, the method comprising:

[0026] (1) in an aqueous solvent, and under alkaline conditions, the calcium source, the carbon source and the silicon source are mixed;

[0027] (2) Aging the resulting mixture, followed by solid-liquid separation, and drying the resulting solid phase;

[0028] Wherein, the calcium source is calcium oxide and / or calcium hydroxide, the carbon source is one or more of graphite, graphene, graphite oxide and graphene oxide, and the silicon source is silicon dioxide;

[0029] The aging conditions include: the temperature is above 100°C, and the time is above 10h.

[0030] According to the present invention, the amount of the calcium source, carbon source and silicon source can be properly adjusted according to the composition of the desired supramolecular material, preferably, the calcium source in terms of CaO, the carbon source in terms of C and th...

Embodiment 1

[0054] This example is used to illustrate the supramolecular material of the present invention and its preparation method.

[0055] (1) Add calcium oxide powder, graphite powder and silicon dioxide powder (the molar ratio of calcium oxide, graphite and silicon dioxide is 1:0.75:1.6, the total amount is 100mmol) into 200mL of water, and then pass through sodium hydroxide Adjust the pH of the system to 10 with sodium bicarbonate buffer solution, and stir and mix at 800rpm for 30min;

[0056] (2) Transfer the mixture into an airtight reaction vessel, and leave it to age at 180°C for 24 hours, then centrifuge, wash the obtained solid phase with water, and dry it at 60°C for 1 hour until it is dried, and grind to obtain the supramolecular material A1 , among them, CaO, C, SiO 2 The molar ratio to bound water is 1:0.75:1.6:0.1.

[0057] The supramolecular material of gained is dispersed in water, through TEM observation (see figure 1 As shown), the supramolecular material forms a...

Embodiment 2

[0059] This example is used to illustrate the supramolecular material of the present invention and its preparation method.

[0060] (1) Add calcium oxide powder, graphite powder and silicon dioxide powder (the molar ratio of calcium oxide, graphite and silicon dioxide is 1:0.65:1.3, the total amount is 200mmol) into 200mL of water, and then pass through sodium hydroxide Adjust the pH of the system to 9.5 with sodium bicarbonate buffer solution, and stir and mix at 650rpm for 40min;

[0061] (2) Transfer the mixture into an airtight reaction vessel, and leave it to age at 170°C for 20 hours, then centrifuge, wash the obtained solid phase with water, dry it at 60°C for 1 hour, and grind it to obtain the supramolecular material A2 , among them, CaO, C, SiO 2 The molar ratio to bound water is 1:0.65:1.3:0.2.

[0062] The obtained supramolecular material is dispersed in water, and observed by TEM, the supramolecular material forms a three-dimensional network aggregate structure i...

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Abstract

The invention relates to the field of gas drilling, in particular to a supramolecular material and a preparation method thereof and application in soilless phase water-based drilling fluid as shearingpotentiator. The supramolecular material is formed by combination of CaO, C, SiO2 and bound-water. According to the supramolecular material, when the supramolecular material is used as the shearing potentiator in the water-based drilling fluid, better shearing effects are obtained without adopting other clay, and the supramolecular material has low viscosity under high shear conditions; the supramolecular material has high viscosity under low shear conditions, which facilitates increasing of drilling speed to obtain soilless phase water-based drilling fluid with strong carrying cutting capacity and good thixotropy.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a supramolecular material, a preparation method thereof, and an application as a shear raising agent in soil-free water-based drilling fluid. Background technique [0002] As a high-efficiency development well type, horizontal wells can increase the contact area between the wellbore and the reservoir, and have a significant effect on improving the recovery of oil wells. During the drilling process of horizontal wells, it is difficult to carry cuttings in the horizontal section, and it is easy to form a cuttings bed, which increases friction, torque, and even causes accidents such as pipe sticking, which seriously affects drilling efficiency. Therefore, the drilling fluid must have good rock-carrying performance, which puts forward higher requirements on the rheology of the drilling fluid. Water-based drilling fluid is widely used because of its environmental protection and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/05E21B21/00
CPCC09K8/032C09K8/05E21B21/00
Inventor 蒋官澄马光长高德利孙金声伍贤柱王凯贺垠博刘凡杨丽丽
Owner CHINA UNIV OF PETROLEUM (BEIJING)