Nanometer plugging agent for water-based drilling fluid, preparing method of nanometer plugging agent and drilling fluid

A technology of water-based drilling fluid and nano plugging agent, applied in the field of water-based drilling fluid, can solve problems such as poor plugging effect and instability of well wall, achieve good plugging, improve plugging performance, and improve dispersibility Effect

Active Publication Date: 2019-05-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide a nano-sealing agent and a Its preparation method and drilling fluid

Method used

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  • Nanometer plugging agent for water-based drilling fluid, preparing method of nanometer plugging agent and drilling fluid

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preparation example Construction

[0019] In order to achieve the purpose of the present invention, the first aspect of the present invention provides a method for preparing modified multi-walled carbon nanotubes, the method comprising the following steps:

[0020] (1) dissolving multi-walled carbon nanotubes and sodium p-styrene sulfonate monomer in deionized water;

[0021] (2) in step (1) solution, add potassium persulfate as radical polymerization initiator, continue to feed inert gas in the reaction process;

[0022] (3) centrifuging the solution obtained in step (2) to remove amorphous carbon and residual catalyst, and filtering the supernatant;

[0023] (4) drying to obtain multi-walled carbon nanotubes coated with polystyrene sodium sulfonate.

[0024] In the method of the present invention, the weight ratio of the amount of multi-walled carbon nanotubes, sodium p-styrene sulfonate monomer and potassium persulfate is 1: (90-120): (0.8-1.2), preferably 1: (95-105): (0.9-1.1).

[0025] In the method of...

preparation example 1

[0047] This preparation example is to illustrate the preparation method of the modified multi-walled carbon nanotubes.

[0048] (1) Weigh 0.05 g of multi-walled carbon nanotubes and 4.75 g of sodium p-styrene sulfonate monomer into a three-necked flask, add 45 mL of deionized water, and ultrasonically disperse for 45 minutes at 25 °C at an ultrasonic frequency of 2.5 megahertz;

[0049] (2) Add 0.0475 grams of potassium persulfate to the solution of step (1) as a free radical polymerization initiator, continuously feed argon during the reaction process, and react for 50 hours at 65° C.;

[0050] (3) Centrifuge the solution obtained in step (2) at 25°C at a centrifugation rate of 9000 rpm for 6 minutes, and then filter the supernatant;

[0051] (4) drying the mixture obtained in step (3) in an oven at 65°C for 11 hours;

[0052] That is, polystyrene sodium sulfonate modified multi-walled carbon nanotubes A1 were obtained.

preparation example 2

[0054] This preparation example is to illustrate the preparation method of the modified multi-walled carbon nanotubes.

[0055] (1) Weigh 0.05 g of multi-walled carbon nanotubes and 5 g of sodium p-styrene sulfonate monomer into a three-necked flask, add 50 mL of deionized water, and ultrasonically disperse for 40 minutes at 27 ° C at a frequency of 3 megahertz;

[0056] (2) Add 0.05 gram of potassium persulfate to the solution of step (1) as a radical polymerization initiator, continuously feed argon in the reaction process, and react for 48 hours at 65° C.;

[0057] (3) Centrifuge the solution obtained in step (2) at 25°C at a centrifugation rate of 9000 rpm for 6 minutes, and then filter the supernatant;

[0058] (4) drying the mixture obtained in step (3) in an oven at 72°C for 9 hours;

[0059] That is, sodium polystyrene sulfonate modified multi-walled carbon nanotubes A2 were obtained.

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Abstract

The invention relates to a nanometer plugging agent for a water-based drilling fluid, a preparing method of the nanometer plugging agent and the drilling fluid. The nanometer plugging agent for the water-based drilling fluid is obtained in a manner that multi-walled carbon nanotubes are covalently coated with sodium polystyrenesulfonate, wherein the tube diameter of the multi-walled carbon nanotubes is 20 nm to 30 nm, and the tube length of the multi-walled carbon nanotubes is 10 microns to 30 microns; the number-average molecular weight of the grafted sodium polystyrenesulfonate is 75 kDa, and the degree of polymerization (DOP) is 900; the drilling fluid is prepared from 100 parts by weight of water, 1-8 parts by weight of bentonite, 4-10 parts by weight of a flow-pattern adjusting agent,0.2-1.2 parts by weight of a thickening agent, 4-10 parts by weight of a fluid loss agent, 30-60 parts by weight of a plugging agent, 10-50 parts by weight of a weighting agent, 0.1-4 parts by weightof a lubricating agent and 0.1-0.4 part by weight of a pH adjusting agent. According to the nanometer plugging agent for the water-based drilling fluid, the preparing method of the nanometer pluggingagent and the drilling fluid, the sodium-polystyrenesulfonate-modified multi-walled carbon nanotubes are used as the plugging agent, micron-and-nanometer-size pores of the mud shale well wall can beeffectively plugged, and the nanometer plugging agent is particularly suitable for drilling construction of stratums with low porosity, low permeability, micro-pore micro-crack development and a remarkable capillary effect.

Description

technical field [0001] The invention relates to the field of water-based drilling fluids, in particular to a nano-blocking agent for water-based drilling fluids, a preparation method thereof, and drilling fluids. Background technique [0002] With the continuous development of unconventional oil and gas resources in oil and natural gas, such as the exploitation of shale gas and tight oil, the wellbore instability of hard and brittle shale has become the first problem to be solved. Most of the mud shale has closed or open bedding and micro-fractures, and the capillary force is strong. Under the dual effects of positive pressure difference and capillary pressure, the drilling fluid is easy to invade, causing the shale to crack along the fracture plane or bedding plane, and continuously develop vertically and horizontally along the fracture plane. In addition, the intruded filtrate will reduce the friction coefficient between fracture surfaces or bedding surfaces, thereby incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/24
Inventor 王平全龙海锋谢刚任研君何毅罗显粱
Owner SOUTHWEST PETROLEUM UNIV
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