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Nanometer anti-channeling agent and preparation method thereof, and anti-channeling cement paste

A technology of anti-channeling agent and cement slurry, which is applied in the field of oil drilling, can solve the problems of fluctuating fluidity and thickening time, reducing the compressive strength of cement stone, and unsatisfactory

Inactive Publication Date: 2020-09-25
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the solid content of the liquid latex used in the existing anti-channeling cement slurry can only reach about 50%, and the solid content of the polymer latex powder often reaches more than 95%. If the amount of latex anti-channeling agent is not enough, it cannot be solved well. For the problem of gas channeling, if the corresponding anti-channeling effect is to be achieved, the amount of liquid latex added will be increased, which will reduce the compressive strength of the cement stone, and will cause fluctuations in the density, fluidity and thickening time of the cement slurry, which cannot be solved. Meet the needs of actual production on site

Method used

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  • Nanometer anti-channeling agent and preparation method thereof, and anti-channeling cement paste
  • Nanometer anti-channeling agent and preparation method thereof, and anti-channeling cement paste
  • Nanometer anti-channeling agent and preparation method thereof, and anti-channeling cement paste

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preparation example Construction

[0039] The present invention also provides a preparation method of the above-mentioned nano anti-channeling agent, comprising: S1) mixing and stirring water and the first dispersant, then adding nano silicon dioxide and nano silicon, dispersing and stirring to obtain a mixed slurry; S2) The mixed slurry, the coupling agent and the first defoaming agent are mixed and stirred to obtain the nano anti-channeling agent.

[0040] The present invention has no special restrictions on the source of all raw materials, which can be commercially available, wherein, the water, the first dispersant, nano-silica, nano-silicon, coupling agent and the first defoamer are the same as above , and will not be repeated here.

[0041] Mix and stir water and the first dispersant; the mixing and stirring speed is preferably 500 to 1500r / min, more preferably 800 to 1200r / min, and more preferably 1000r / min; the mixing and stirring time is preferably 5 to 1000r / min 15 minutes, more preferably 8-12 minut...

Embodiment 1

[0062] Take 100 parts by weight of distilled water, adjust the speed of the stirrer device to 1000r / min, add 0.5 parts by weight of sulfonated acetone formaldehyde condensate to the distilled water, stir at a constant speed for 10min; adjust the speed to 2000r / min, and then take 25 parts by weight of 150nm nano Silicon dioxide and 6 parts by weight of nano-silicon of 200nm are dispersed in the solution at this rotating speed, stirred for 15min until uniformly dispersed, and a mixed slurry is obtained; in the mixed slurry, 8 parts by weight of vinyltriethoxysilane are first added, Stir at a rotational speed of 2000r / min for 10min, then add 0.5 parts by weight of polyoxypropylene glyceryl ether, and stir at a rotational speed of 2000r / min for 10min to obtain the nano anti-channeling agent.

Embodiment 2

[0064] Anti-channeling cement slurry for extended reach wells, low density (1.50g / cm 3 ), which contains the following raw materials by weight: 100 parts by weight of Jiahua G grade cement, 0.5 parts by weight retarder (boric acid), 0.1 parts by weight of defoamer (polyoxypropylene glyceryl ether), 10 parts by weight of filler ( Fly ash particle diameter is 100 μm), 0.5 parts by weight dispersant (sulfonated acetone formaldehyde condensate), 5 parts by weight of anti-channeling agent (nano anti-channeling agent prepared in embodiment 1), 5 parts of fluid loss reducer (acrylamide -sodium acrylate copolymer), 20 parts by weight lightening agent (the particle size of the floating beads is 100 μm), 90 parts by weight of water. The raw materials are mixed and stirred evenly to prepare the anti-channeling cement slurry.

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Abstract

The invention provides a nanometer anti-channeling agent. The nanometer anti-channeling agent is prepared from the following components in parts by weight: 20 to 40 parts of nanometer silicon dioxide,5-10 parts of nanometer silicon, 100 parts of water, 5-15 parts of a coupling agent, 0.5-2 parts of a first dispersant, and 0.5-1 part of a first defoaming agent. Compared with the prior art, the nanometer anti-channeling agent provided by the invention is a nano-scale emulsion, when the nano-scale emulsion is added into cement paste, the problem of volume shrinkage caused in a cement paste curing process can be effectively solved, the elasticity and toughness of set cement and the bonding strength between the set cement and interfaces I and II are enhanced, and nano-scale particles can improve the microstructure and the seepage resistance of set cement; and moreover, the nanometer anti-channeling agent has a relatively high specific surface area, and can be used for effectively constraining free water among pores of cement solid particles, so cement paste keeps relatively good stability, the permeability of the set cement is reduced, and the strength of the set cement is improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a nano anti-channeling agent, a preparation method thereof, and an anti-channeling cement slurry. Background technique [0002] The main purpose of oil well cementing is to isolate the oil, gas and water layers, protect the production layer and reinforce the well wall. After cementing, the cemented body formed by the casing-cement sheath-formation acts as a cementing barrier to ensure the integrity of the wellbore of the oil well. [0003] With the development of oil drilling technology, the use of extended-reach horizontal wells for oil and gas production has been widely used. Due to the long sealing section of extended-reach horizontal well cementing, there will be a certain temperature difference between the top and bottom of the cementing section. Inconsistent thickening time and strength development during the waiting period of the cement running slurr...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B28/00C09K8/493
CPCC04B28/00C04B40/0039C04B2111/00008C04B2111/00724C04B2201/20C04B2201/50C09K8/493C04B14/06C04B14/04C04B22/002C04B24/42C04B24/40C04B24/405C04B2103/408C04B2103/50C04B2103/22C04B18/08C04B18/141C04B18/146C04B24/2652C04B18/082C04B18/12C04B14/368
Inventor 张红杰夏忠跃李斌张林强解健程孙泽宁亓银波姜磊王鹏杨程王易忠江智勋刘强
Owner CHINA NAT OFFSHORE OIL CORP
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