Modified silicon dioxide nanoparticle and preparation method thereof and drilling fluid

A technology of silica and nanoparticles, applied in the field of oil drilling fluid, can solve the problems of increasing drilling fluid, increasing particle size, and damaging oil and gas layers

Active Publication Date: 2016-09-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding nano-sized particles to the drilling fluid will inevitably increase the solid phase content and submicron particle content of the drilling fluid, increasing the chance of fine particles damaging oil and gas layers; and due to the high surface activity of the added material, it will absorb part of the drilling fluid Treatment agent, reduce the effective content of the treatment agent; it is also prone to agglomeration itself, and the particle size becomes significantly larger after agglomeration. It is difficult to disperse the agglomerated particles to the nanometer scale only by stirring, and lose the characteristics of nanoparticles
[0005] At present, although nano-blocking agents have made some breakthroughs, there are still many problems: First, Al-Bazali calculated in 2005 through the capillary pressure formula that the average distribution of shale pore-throat size is between 10 and 30 nm. According to the one-third plugging theory, the particle size of the plugging material should be roughly equal to one-third of the pores, which means that the selected particle size is between 3 and 10 nm to form a good plugging of mud shale; The nano-blocking agent developed has a nano-particle size of more than 50nm, which cannot be effectively blocked
The nano-blocking agent itself is also prone to agglomeration. After agglomeration, the particle size becomes significantly larger. It is difficult to disperse the agglomerated particles to the nanometer scale only by stirring.

Method used

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  • Modified silicon dioxide nanoparticle and preparation method thereof and drilling fluid
  • Modified silicon dioxide nanoparticle and preparation method thereof and drilling fluid
  • Modified silicon dioxide nanoparticle and preparation method thereof and drilling fluid

Examples

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preparation example Construction

[0057] The present invention also provides a method for preparing modified silica nanoparticles, the method comprising:

[0058] (1) In the presence of a monohydric alcohol and a coupling agent, one or more of the monomers of the structure shown in the formula (1) and one or more of the monomers of the structure shown in the formula (2) are combined with two Silicon oxide nanoparticles undergo a contact reaction;

[0059] (2) In the presence of a redox initiating system, the product of the contact reaction is subjected to a polymerization reaction;

[0060] Formula 1) Formula (2)

[0061] Among them, R 1 Alkoxy group selected from -OH, C1-C10 or -N(R 3 )R 2 , R 2 and R 3 each independently selected from H, C1-C10 alkyl, and C1-C10 alkyl substituted by a substituent of -COOH, -OH, halogen and -SO 3 One or more of H; L is a C1-C10 alkylene group.

[0062] According to the present invention, the above formula (1) and formula (2) and the groups involved therein are as ...

Embodiment 1

[0099] This example is used to illustrate the modified silica nanoparticles and the preparation method thereof of the present invention.

[0100] (1) Stir 0.12 mol of acrylic acid and 0.19 mol of N,N'-methylenebisacrylamide (purchased from Huantai County Taili Chemical Co., Ltd.) at about 25°C and 300 rpm for 30 minutes, and oxidize with hydrogen Adjust the pH to 7 with sodium to obtain a mixture A1; 0.5 g of silica nanoparticles (purchased from Nanjing Tianxing New Materials Co., Ltd. TSP grade, particle size of about 20 nm) and 8 g of isopropanol were mixed at about 25 ° C, Stirring at 300 rpm for 30 min to obtain mixture B1; stirring mixture A1 and mixture B1 at about 25° C. for 30 min at 300 rpm to obtain mixture C1;

[0101] (2) Mix 0.01g of coupling agent γ-aminopropyltriethoxysilane (purchased from Huantai County Taili Chemical Co., Ltd. KH550 brand) with the above mixture C1 and react at 60°C and 200rpm for 30min ; Then add 0.094g of redox initiation system (composed ...

Embodiment 2

[0105] This example is used to illustrate the modified silica nanoparticles and the preparation method thereof of the present invention.

[0106] (1) Stir 0.15 mol of methyl acrylate and 0.2 mol of N,N'-methylenebisacrylamide (purchased from Huantai County Taili Chemical Co., Ltd.) at about 30°C and 250 rpm for 25 minutes, and use Sodium hydroxide adjusted the pH to 7.5 to obtain mixture A2; 1 g of silica nanoparticles (purchased from Nanjing Tianxing New Materials Co., Ltd. TSP grade, particle size of about 20 nm) and 8 g of isopropanol were mixed at about 30 ° C. , stirring at a rotating speed of 250rpm for 25min to obtain a mixture B2; stirring the mixture A2 and the mixture B2 at about 30°C and at a rotating speed of 250rpm for 25min to obtain a mixture C2;

[0107] (2) Mix 0.012g of coupling agent γ-aminopropyltriethoxysilane (purchased from Huantai County Taili Chemical Co., Ltd. KH550 brand) with the above mixture C2 and react at 50°C and 250rpm for 30min ; Then add 0....

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Abstract

The invention relates to the field of petroleum drilling fluids, and discloses a modified silicon dioxide nanoparticle. A modified group on the modified silicon dioxide nanoparticle comprises an acrylic copolymer chain, and the structural units in the acrylic copolymer chain are supplied by one or more of monomers with the structure shown in a formula (1) (please see the formula in the desctrption) and one or more monomers with the structure shown in a formula (2) (please see the formula in the desctrption). The invention further provides a preparaiotn method of the modified silicon dioxide nanoparticle, the modified silicon dioxide nanoparticle prepared through the preparation method and a drilling fluid containing the modified silicon dioxide nanoparticle serving as a blocking agent. Accordingly, by adopting the modified silicon dioxide nanoparticle, the modified silicon dioxide nanoparticle is not prone to be agglomerated into large particles when the modified silicon dioxide nanoparticle is taken as the blocking agent in the drilling fluid, and the good blocking effect can be achieved.

Description

technical field [0001] The invention relates to the field of petroleum drilling fluid, in particular to a modified silicon dioxide nano particle, a preparation method thereof and drilling fluid. Background technique [0002] Well collapse, lost circulation, and protection of oil and gas layers are three major technical problems that restrict the smooth progress of drilling projects. For formations with well-developed beddings and fractures, especially shale formations, in order to prevent formation well collapse and leakage and reduce damage to oil and gas layers, the drilling fluid is required to have strong sealing properties to effectively seal formation beddings and fractures. Prevent drilling fluid and its filtrate from entering the formation to achieve the purpose of improving the pressure bearing capacity of the formation, stabilizing the well wall, preventing lost circulation, and protecting oil and gas layers. Therefore, the evaluation method of drilling fluid plug...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F222/38C08F220/06C08F220/14C08F220/18C08F220/58C09K8/42
CPCC09K8/426C08F292/00C09K2208/10C08F220/18C08F220/585C08F220/1802
Inventor蒋官澄祁由荣葛庆颖张领宇安玉秀杨丽丽贺垠博史赫史亚伟
OwnerCHINA UNIV OF PETROLEUM (BEIJING)