Recyclable Microbubble Drilling Fluid

A drilling fluid and microbubble technology, applied in the field of oilfield drilling fluids, can solve the problems of increased bottom hole density of drilling fluids, temperature resistance below 120°C, affecting drilling construction safety, etc. The effect of strong compression

Active Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A microfoam drilling fluid is disclosed in ZL200910157353.1, but the temperature resistance of this drilling fluid is below 120°C; a high temperature resistant recyclable microfoam drilling fluid or completion fluid is disclosed in ZL200710113558.0, but The compression resistance of the microbubbles in this kind of drilling fluid is insufficient. Under the high pressure at the bottom of the well, the air diffuses out of the foam, resulting in a significant increase in the bottom hole density of the drilling fluid, which affects the safety of drilling construction.

Method used

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  • Recyclable Microbubble Drilling Fluid
  • Recyclable Microbubble Drilling Fluid
  • Recyclable Microbubble Drilling Fluid

Examples

Experimental program
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Embodiment 1

[0018] Add 6g of bentonite and 0.3g of soda ash to 100g of clear water, stir at high speed for 2 hours, and place it at room temperature for 24 hours to obtain the base slurry (1). - Sodium alkenyl sulfonate: fatty alcohol polyoxyethylene ether sodium sulfate = 1:0.3:0.8 mass ratio mixed), 0.5g foam stabilizer (made of Wenlun rubber: high viscosity sodium carboxymethyl cellulose = 1: 1 mass ratio), 0.2g foam enhancer (mixed with lauryl alcohol: triethanolamine = 1:0.5 mass ratio), 3g fluid loss control agent (made of low viscosity sodium carboxymethylcellulose: sulfonated Phenolic resin: sulfonated lignite = 1:2:2 mass ratio mixed), 0.2g inhibitor and 0.3g flow regulator are added to the base slurry (1) in sequence, and the treatment agent is mixed evenly with a stirrer for use. The inhibitor is a copolymer whose molar ratio is acrylamide: dimethylamine: epichlorohydrin = 1:0.5:0.5, with a relative molecular mass of 50,000; the flow regulator is acrylic acid whose molar ratio ...

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Abstract

The invention relates to a recyclable microbubble drilling fluid which comprises the following components in parts by weight: (1) basic mud containing 3-6 parts of bentonite, 0.1-0.4 part of sodium carbonate and 100 parts of clear water; (2) a treating agent containing 0.5-1 part of foaming agent, 0.3-0.8 part of foam stabilizer, 0.05-0.3 part of foam enhancer, 2-4 parts of filtrate reducer, 0.1-0.3 part of inhibitor and 0.3-0.7 part of flow pattern modifier. The microbubble drilling fluid disclosed by the invention can resist the temperature up to 135 DEG C, is stable in foams and strong in resistance to compression, salt and carbon pollution, keeps lower density under the high pressure condition in a shaft bottom, has a good effect on inhibiting hydration of mud shale.

Description

Technical field: [0001] The invention relates to a recyclable micro-bubble drilling fluid, in particular to a recyclable micro-bubble drilling fluid in the drilling process of low-pressure leaky formations, and belongs to the technical field of oil field drilling fluid. technical background: [0002] At present, in the process of low-pressure or underbalanced drilling in domestic oil fields, foam drilling fluid is often used to reduce the density of drilling fluid and ensure the safety of drilling construction. However, ordinary foam has a large particle size, which seriously affects the water feeding efficiency of the mud pump, and requires supporting gas injection equipment (compressors, production and gas injection equipment, etc.), and the drilling cost is relatively high. The microfoam drilling fluid is a kind of microfoam with a diameter between 25 and 200 μm formed by surfactants and polymers. It has low density and can be reused. It is not affected by downhole tools ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38
Inventor 谢建宇周亚贤郝纪双耿晓慧卢国林刘光成万龙
Owner CHINA PETROLEUM & CHEM CORP
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