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Modified silica nanoparticles and preparation method thereof and drilling fluid suitable for shale gas well

A silicon dioxide and nanoparticle technology, applied in the field of oil drilling fluid, can solve the problems of increasing fine particles, increasing drilling fluid, damaging oil and gas layers, etc., and achieving the effect of not easy to agglomerate and good blocking effect

Active Publication Date: 2016-07-27
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 silica nanoparticles and preparation method thereof and drilling fluid suitable for shale gas well
  • Modified silica nanoparticles and preparation method thereof and drilling fluid suitable for shale gas well
  • Modified silica nanoparticles and preparation method thereof and drilling fluid suitable for shale gas well

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preparation example Construction

[0049] The present invention also provides a method for preparing modified silica nanoparticles, the method comprising:

[0050] (1) In the presence of a monohydric alcohol and a coupling agent, combine one or more of the monomers of the structure represented by formula (1) and one or more of the monomers of the structure represented by formula (2) with two Silicon oxide nanoparticles undergo contact reaction;

[0051] (2) In the presence of a redox initiation system, subject the product of the contact reaction to a polymerization reaction;

[0052]

[0053] Where R 1 -R 5 One of them is -L"-SO 3 H and the rest are each independently selected from H, -OH, halogen, and C1-C10 alkyl; L, L'and L" are each independently selected from C0-C10 alkylene.

[0054] According to the present invention, the above formula (1) and formula (2) and the groups involved in them are as described above, and will not be repeated here.

[0055] According to the present invention, in step (1), the amount of m...

Embodiment 1

[0090] This example is used to illustrate the modified silica nanoparticles of the present invention and the preparation method thereof.

[0091] (1) Stir 0.12mol of p-styrenesulfonic acid and 0.19mol of N,N'-methylenebisacrylamide (purchased from Huantai County Taili Chemical Co., Ltd.) for 30min at about 25°C and 300rpm , And adjust the pH to 7 with sodium hydroxide to obtain mixture A1; mix 0.5 g of silica nanoparticles (purchased from Nanjing Tianxing New Material Co., Ltd. TSP brand, particle size is about 20nm) and 8g of n-propanol in about Stir for 30 minutes at 25°C and 300 rpm to obtain mixture B1; stir mixture A1 and mixture B1 at about 25°C and 300 rpm for 30 minutes to obtain mixture C1;

[0092] (2) Mix 0.01g of coupling agent γ-aminopropyltriethoxysilane (purchased from Huantai Taili Chemical Co., Ltd. KH550 brand) with the above mixture C1 and react at 60°C and 200rpm stirring for 30min ; Then add 0.094g of the redox initiation system (composed of sodium bisulfite a...

Embodiment 2

[0096] This example is used to illustrate the modified silica nanoparticles of the present invention and the preparation method thereof.

[0097] (1) Stir 0.15 mol of p-styrene sulfonic acid and 0.2 mol of N,N'-methylene bisacrylamide (purchased from Huantai Taili Chemical Co., Ltd.) for 25 min at about 30°C and 250 rpm , And adjust the pH to 7.5 with sodium hydroxide to obtain a mixture A2; 1g of silica nanoparticles (purchased from Nanjing Tianxing New Material Co., Ltd. TSP brand, particle size is about 20nm) and 8g of isopropanol in about 30 Stir at 250 rpm for 25 min at ℃ to obtain mixture B2; Stir mixture A2 and mixture B2 at about 30 ℃ and at 250 rpm for 25 min to obtain mixture C2;

[0098] (2) Mix 0.012g of coupling agent γ-aminopropyltriethoxysilane (purchased from Huantai Taili Chemical Co., Ltd. KH550 brand) with the above mixture C2 and react at 50°C and 250rpm for 30min ; Then add 0.094g of the redox initiation system (composed of sodium bisulfite and ammonium persul...

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Abstract

The invention relates to the field of oil drilling fluids and discloses modified silica nanoparticles. The modified group on the modified silica nanoparticles comprises a modified polymer chain; and the structural unit in the modified polymer chain is provided by one or more of monomers in the structure shown in the formula (1) and one or more of the monomers in the structure shown in the formula (2). The invention further provides a preparation method of the modified silica nanoparticles and the modified silica nanoparticles prepared by the preparation method. The invention further provides a drilling fluid containing the modified silica nanoparticles as a blocking agent suitable for a shale gas well. By modified modified silica nanoparticles, when the modified silica nanoparticles are used as the blocking agent in the drilling fluid, large particles are not easily agglomerated; a relatively good blocking effect can be obtained; the formula (1) and the formula (2) are as shown in the specification.

Description

Technical field [0001] The invention relates to the field of petroleum drilling fluids, in particular to a modified silica nanoparticle, a preparation method thereof, and a drilling fluid suitable for shale gas wells. Background technique [0002] Well collapse, lost circulation, and oil and gas layer protection are three major technical problems that restrict the smooth progress of drilling projects. For formations with well-developed bedding and fissures, especially shale formations, in order to prevent formation wells from collapsing and leakage, and reduce damage to the oil and gas layer, the drilling fluid is required to have strong plugging properties and effectively seal the strata and fissures. 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 the oil and gas layer. Therefore, the evaluation method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C09K8/03C09K8/16
CPCC08F292/00C09K8/032C09K8/16C09K2208/10C08F222/385C09C1/3081C09C1/3072C01P2004/64C01B33/18C08K3/36C09C3/12C01P2006/12C01P2004/62C09K8/035C09K8/24
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
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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