Medium-high-temperature strong plugging hard rubber micro-foam drilling fluid and preparation method thereof

A drilling fluid, medium and high temperature technology, applied in chemical instruments and methods, drilling compositions, geothermal energy power generation, etc., can solve the problems of insufficient pressure resistance, insufficient temperature resistance, and low number of cycles, etc., to improve the application Accuracy, preparation time saving, and equipment cost saving effects

Active Publication Date: 2021-07-16
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of insufficient temperature resistance, short half-life, less cycle times, insufficient pressure resistance and poor plugging performance of conventional recirculating foam drilling fluids, and to provide a medium-high temperature strong plugging hard rubber drilling fluid. Foam drilling fluid and preparation method thereof

Method used

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  • Medium-high-temperature strong plugging hard rubber micro-foam drilling fluid and preparation method thereof
  • Medium-high-temperature strong plugging hard rubber micro-foam drilling fluid and preparation method thereof
  • Medium-high-temperature strong plugging hard rubber micro-foam drilling fluid and preparation method thereof

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preparation example Construction

[0048] The invention provides a medium-high temperature strong plugging hard rubber microfoam drilling fluid or completion fluid and a preparation method thereof, wherein:

[0049] A medium-high temperature strong plugging hard glue microfoam drilling fluid or completion fluid, which comprises according to parts by mass:

[0050] Sodium bentonite, 0-3 parts;

[0051] Low molecular weight anti-high temperature foam stabilizer, 0.1-0.2 parts;

[0052] Bubble film density reducer, 1-2 parts;

[0053] Wetting agent, 0.1 to 0.2 parts;

[0054] Foaming agent, 0.3 to 0.5 parts;

[0055] Sulfonate polymer fluid loss reducer, 0.1-0.5 parts;

[0056] Temperature-resistant resin fluid loss reducer, 2 to 3 parts;

[0057] Foam surface viscosity regulator, 0.1 to 0.3 parts;

[0058] Low-density plugging agent, 2 to 4 parts;

[0059] Alkaline conditioner, 0-0.1 parts;

[0060] water, 100 parts.

[0061] in:

[0062] The foam stabilizer is one or a mixture of hydrophobically modifi...

Embodiment 1

[0074] Take 100 parts of clear water, add 0.1 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed stirrer for 2 hours; 1.5 parts of shell plant fiber powder, fully stirred for 5 minutes, and left to stand for 2 hours to form a temperature-resistant hard gum base liquid. Accurately weigh 0.3 part of xanthan gum, 0.5 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, 0.1 part of sodium lauryl sulfate, 2 parts of lignite resin, and 1 part of phenolic resin Mix evenly, add the above-mentioned temperature-resistant hard rubber base solution while stirring, stir with a low-speed strong stirrer at 900r / min for 6h, then add 2 parts of non-penetrating treatment agent, 1 part of mica fiber, and stir for 30 minutes.

Embodiment 2

[0076] Take 100 parts of clear water, add 0.2 parts of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed stirrer for 2 hours; add 0.2 parts of polysorbate after uniform dispersion and dissolution, and stir for 15 minutes; add modified hard shell 1.5 parts of plant fiber powder, fully stirred for 5 minutes, and left to stand for 2 hours to form a temperature-resistant hard gum base liquid. Accurately weigh 2 parts of sodium bentonite, 0.08 part of sodium carbonate, 0.1 part of hydroxyethyl cellulose, 0.1 part of xanthan gum, 0.3 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, Mix 0.1 part of sodium lauryl sulfate, 2 parts of potassium humate fluid loss control agent, and 1 part of sulfonated phenolic resin fluid loss control agent, and add the above-mentioned temperature-resistant hard gum base liquid while stirring, and use a low-speed strong agitator at 1000r / min and stir for 6h, then add 1 p...

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Abstract

The invention discloses a medium-high temperature strong plugging hard rubber recyclable foam drilling fluid and a preparation method thereof. A low-molecular-weight high-temperature-resistant foam stabilizer, a wetting agent and a bubble film density lightening agent are added into clear water to form a temperature-resistant hard rubber base solution. Sodium bentonite, an alkaline regulator, a sulfonate polymer filtrate reducer, a foaming agent, a temperature-resistant resin filtrate reducer and a foam surface viscosity regulator are added into the temperature-resistant hard rubber base solution to form the medium-high temperature hard rubber recyclable micro-foam drilling fluid or completion fluid. A low-density blocking agent is added and stirred to form the medium-high temperature strong plugging hard rubber micro-foam drilling fluid or completion fluid. The medium-high-temperature strong plugging recyclable foam fluid is low in solid phase content, strong in membrane structure and excellent in foam stabilizing effect before and after medium-high temperature; and the recyclable times and the plugging effect of the completion fluid after the micro-foam drilling fluid can be improved, the loss of the drilling fluid is reduced, the safe and high-effect recyclable micro-foam drilling and completion fluid can be used for exploiting medium-high-temperature and low-pressure easily-leaking oil and gas resources, geothermal wells and the like, and the deep well drilling requirement is met.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging in drilling engineering, in particular to a microfoam drilling fluid or well completion fluid that is resistant to medium and high temperatures at 150°C, has a strong membrane structure, strong sealing performance, and can be recycled on the ground and in the wellbore and its Preparation Process. Background technique [0002] Foam drilling fluid is a low-density key drilling fluid technology for formations with low pressure and malignant loss. It has the characteristics of strong leakage prevention and plugging, low filtration loss, low reservoir damage, and strong rock-carrying ability. The main developments are aerated foam drilling fluid technology and recyclable foam drilling fluid technology. Recyclable micro-foam drilling fluid can reduce the density of drilling fluid without additional special equipment on the well site, just like water-based drilling fluid is circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38C09K8/487
CPCC09K8/38C09K8/487Y02E10/10
Inventor 杨倩云王宝田王旭东袁丽赵红香于雷杨华
Owner 中石化石油工程技术服务有限公司
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