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Environment-friendly nano water-based drilling fluid for low permeability reservoirs and preparation method thereof

A drilling fluid and nano-water technology, which is applied in the field of oil drilling, can solve the problems such as no reports of an environmentally friendly nano-drilling fluid system, less drilling fluid, etc., and achieve the effects of superior rheology and filtration performance and good reservoir protection effect.

Inactive Publication Date: 2019-04-23
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanomaterials are widely used in medicine, pharmacy, chemical and biological monitoring, manufacturing, optics, etc., but there are few studies on their application in drilling fluids, and there have been no reports on environmentally friendly nano-drilling fluid systems for low-permeability reservoirs

Method used

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  • Environment-friendly nano water-based drilling fluid for low permeability reservoirs and preparation method thereof
  • Environment-friendly nano water-based drilling fluid for low permeability reservoirs and preparation method thereof
  • Environment-friendly nano water-based drilling fluid for low permeability reservoirs and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Environmentally friendly nano water-based drilling fluid is composed of the following mass ratios:

[0033] 100mL water, 1% nano-bentonite, 0.05% sodium carbonate, 0.3% environmentally friendly nano viscosifier, 1% environmentally friendly nano fluid loss reducer, 0.5% environmentally friendly anti-slump inhibitor, 0.2% environmentally friendly lubricant, and environmentally friendly nano plugging 1% agent, 0.2% environment-friendly nano flow regulator.

[0034] In this embodiment, the environmental-friendly nano thickening and shearing agent used is nano xanthan gum homogenized under high pressure at a homogenizing pressure of 200 MPa, with a particle size of 50-800 nm.

[0035] In this example, the environmental-friendly nano fluid loss reducer used is corn starch modified by nanometerization, and the particle size is 300-800nm. The specific modification steps are as follows: Add 10 parts by mass of cornstarch to 50 parts by mass of water, let stand at 5°C for 12 hou...

Embodiment 2

[0041] Environmentally friendly nano water-based drilling fluid is composed of the following mass ratios:

[0042] 100mL water, 2% nano-bentonite, 0.1% sodium carbonate, 0.6% environmentally friendly nano-viscosity enhancer, 0.5% environmentally friendly nano fluid loss reducer, 2% environmentally friendly anti-slump inhibitor, 1.0% environmentally friendly lubricant, and environmentally friendly nano plugging 3% agent, 1% environmentally friendly nano flow regulator.

[0043] In this example, the environmental-friendly nano thickening and cutting agent used is carboxymethyl cellulose homogenized under high pressure at a homogenizing pressure of 100 MPa, with a particle size of 30-800 nm.

[0044] In this example, the environmental-friendly nano-fluid loss reducer used is made of potato starch through nano-modification, with a particle size of 300-800 nm. Add 30 parts by mass of potato starch to 180 parts by mass of water, let stand at 5°C for 12 hours, and use a 600W high-po...

Embodiment 3

[0050] Environmentally friendly nano water-based drilling fluid is composed of the following mass ratios:

[0051] 100mL water, 4% nano-bentonite, 0.2% sodium carbonate, 0.8% environmental-friendly nano viscosity increasing agent, 2% environmental-friendly nano fluid loss reducer, 4% environmental-friendly inhibition and anti-slump agent, 1.5% environmental-friendly lubricant, and environmental-friendly nano-blocking 5% agent, 2% environment-friendly nano flow regulator.

[0052] In this example, the environmental-friendly nano thickening and cutting agent used is polyanionic cellulose homogenized under high pressure at a homogenizing pressure of 150 MPa, with a particle size of 50-800 nm.

[0053] In this example, the environmental-friendly nano-fluid loss reducer used is made of tapioca starch through nano-modification, and the particle size is 300-600 nm. Add 40 parts by mass of tapioca starch to 200 parts by mass of water, let stand at 5°C for 12 hours, and use a 600W hig...

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Abstract

The invention relates to an environment-friendly nano water-based drilling fluid for low permeability reservoirs and a preparation method thereof. The drilling fluid is made from water, nano bentonite, anhydrous sodium carbonate, an environment-friendly nano tackifying stripping agent, an environment-friendly nano filtrate loss reducer, an environment-friendly inhibitive anti-collapse agent, an environment-friendly lubricant, an environment-friendly nano blocking agent, and an environment-friendly nano flow pattern regulator. The preparation method includes: adding nano bentonite into water, and mixing well; adding anhydrous sodium carbonate, mixing well, and hydrating for 24 h; adding an environment-friendly nano tackifying stripping agent, an environment-friendly nano filtrate loss reducer, an environment-friendly inhibitive anti-collapse agent, an environment-friendly lubricant, an environment-friendly nano blocking agent, and an environment-friendly nano flow pattern regulator in sequence, and mixing well to obtain the environment-friendly nano water-based drilling fluid. The environment-friendly nano water-based drilling fluid can well inhibit hydrating swelling of clay, and has good filtration and wall-building property, as well as good rock-carrying property, excellent environmental friendliness and zero environmental harm.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to an environment-friendly nanometer water-based drilling fluid for low-permeability reservoirs and a preparation method thereof. Background technique [0002] Nanomaterials are composed of nanoscale small particles, generally referring to particles with a size of 1-100nm, and have the following characteristics: 1. Surface effect, that is, a very large specific surface area and high surface activity; 2. Small size effect , that is, due to the reduction of particle size, changes in macroscopic physical properties are caused; 3. Quantum size effect. That is, when the particle size drops to the nanometer level, the energy level changes; 4. Macroscopic quantum tunneling effect, that is, the ability of microscopic particles to cross the potential barrier. [0003] Drilling downhole accidents, especially the pollution of oil and gas layers, are mostly caused by the clay in the drilling ...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/68C09K8/508C09K8/035
CPCC09K8/035C09K8/24C09K8/508C09K8/68
Inventor 刘书杰邢希金邱正松周国伟耿亚楠冯桓榰曹砚锋杨玉贵
Owner CHINA NAT OFFSHORE OIL CORP
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