Micron-nano plugging anti-sloughing drilling fluid, and preparation method and application thereof

A technology of plugging and anti-slumping, nano plugging agent, applied in the field of drilling fluid, can solve the problems of unsatisfactory plugging and anti-slumping effect, poor dispersion stability, easy agglomeration of drilling fluid, etc., to prevent hydraulic tipping and spalling effects, Improve the strength and maintain the stability of the well wall

Active Publication Date: 2020-03-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of high cost and non-environmental protection of using oil-based drilling fluid. The plugging and anti-collapse effect of conventional water-based drilling fluid is not ideal when drilling in fractured carbonate formations in deep wells and ultra-deep wells. As well as the disadvantages of poor dispersion stability of

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  • Micron-nano plugging anti-sloughing drilling fluid, and preparation method and application thereof
  • Micron-nano plugging anti-sloughing drilling fluid, and preparation method and application thereof

Examples

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preparation example Construction

[0040] According to the present invention, the preparation method of described nano plugging agent comprises:

[0041] (1) The nano-carbon powder and nitric acid are heated to reflux and then cooled, centrifuged, washed and filtered to obtain sample S1;

[0042] (2) Mix the sample S1 with concentrated nitric acid and concentrated sulfuric acid, carry out the first ultrasonic wave, and then perform centrifugal separation and washing treatment to obtain the sample S2;

[0043] (3) In the presence of an antifoaming agent, the sample S2 is dissolved in a dispersant for the second ultrasonic treatment, water washing, centrifugation and drying to obtain a sample S3;

[0044] (4) Grinding the sample S3 to obtain a nano-blocking agent.

[0045] According to the present invention, the nano-blocking agent is a surface-modified nano-carbon powder, black spherical powder particles, an average particle diameter of 30-85nm, preferably 35.3-75.2nm, and a surface hydrophilic material; in the...

preparation example 1

[0073] This preparation example is to illustrate the preparation method of the nano-blocking agent (surface-modified nano-carbon powder) of the present invention.

[0074] Take 0.5 parts by weight of nano-carbon powder, add it to 100 parts by volume of nitric acid with a concentration of 2.4mol / L, heat to 40°C and reflux for 20h, and after cooling to room temperature, perform centrifugation three times at a speed of 4000r / min. Rinse with deionized water several times to neutrality and then filter with a microporous membrane to obtain sample A1;

[0075]Take 0.1 parts by weight of sample A1, add concentrated nitric acid and concentrated sulfuric acid with a total volume of 100mL in turn, wherein the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 2.5:1, mix well and then ultrasonicate for 4h under 1000W power, at a speed of 4000r / min After three times of centrifugation and repeated washing with deionized water to neutrality, sample A2 was obtained;

...

preparation example 2

[0079] This preparation example is to illustrate the preparation method of the nano plugging agent of the present invention.

[0080] Take 1.5 parts by weight of nano-carbon powder, add it to 100 parts by volume of nitric acid with a concentration of 2.6 mol / L, heat to 50°C and reflux for 24 hours, and after cooling to room temperature, perform centrifugation for 4 times at a speed of 5000r / min. After washing with deionized water several times to neutrality, filter with a microporous membrane to obtain sample B1.

[0081] Take 0.3 parts by weight of sample B1, add concentrated nitric acid and concentrated sulfuric acid with a total volume of 100mL in turn, wherein the volume ratio of concentrated sulfuric acid and concentrated nitric acid is 3:1, mix well, and ultrasonicate for 5 hours at a power of 1250W at a speed of 5000r / min Carry out 4 times of centrifugation, wash with deionized water several times to neutrality, and obtain sample B2;

[0082] Fully dissolve the sample ...

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Abstract

The invention relates to the field of drilling fluid and discloses a micron-nano plugging anti-sloughing drilling fluid, and a preparation method and an application thereof. The drilling fluid contains water, bentonite, a fluid loss agent, an anti-sloughing agent, a nano-plugging agent, and a weighting agent, wherein the anti-sloughing agent is selected from one or more of modified asphalt, CaCO3powder and nano paraffin emulsion, the CaCO3 powder being 400-mesh and 1250-mesh. The D50 (particle size mid-value) of the nano paraffin emulsion is 6.5 [mu]m; the nano-plugging agent is surface-modified nano-carbon powder, average particle size being 30-85 nm. The drilling fluid, when being applied to carbonatite fractured formation well drilling of fracture zones in deep and super-deep wells, can effectively improve the collapse pressure of the fractured formation and is high-effective in plugging and anti-sloughing effect.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to a micro-nano plugging and anti-collapse drilling fluid and a preparation method and application thereof. Background technique [0002] In the process of drilling fractured carbonate formations in deep and ultra-deep well fault zones, the non-equilibrium in-situ stress of formations is broken, often resulting in stress-releasing fractures. Drilling fluid filtrate intrusion into formation pores and fractures will destroy the effective cementation between formation rock clay minerals, resulting in further expansion and connection of micro-nano pores and fractures, resulting in a decrease in borehole wall collapse pressure. During the process of drilling or lifting and lowering, the rotating drilling tool will inevitably have a mechanical impact on the well wall, causing the well wall to collapse and fall off. Drilling costs. [0003] Although the use of oil-mixed drilling fluid or o...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/20C09K8/508C09K8/467C09K8/42C09K8/03C09K8/035
CPCC09K8/03C09K8/032C09K8/035C09K8/206C09K8/24C09K8/426C09K8/467C09K8/5086C09K8/514C09K2208/10C09K8/145C09K8/16
Inventor 白杨李成罗平亚王平全张昊程焱李国军蒋官澄刘敬平
Owner SOUTHWEST PETROLEUM UNIV
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