A kind of medium-high temperature hard rubber recyclable 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 waste of treatment agent cost, less cycle times, insufficient temperature resistance, etc., to protect oil and gas layer, low solid content, saving preparation time

Active Publication Date: 2022-07-12
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] In order to solve the problem of insufficient temperature resistance, poor stability, less cycle times, and waste of high-temperature recirculating foam drilling fluid treatment agent in conventional recirculating foam drilling fluid, the present invention proposes to add The key treatment agent forms a kind of medium and high temperature hard rubber recyclable foam drilling fluid that can resist about 150°C and its preparation method

Method used

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  • A kind of medium-high temperature hard rubber recyclable foam drilling fluid and preparation method thereof
  • A kind of medium-high temperature hard rubber recyclable foam drilling fluid and preparation method thereof
  • A kind of medium-high temperature hard rubber recyclable foam drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Take 100 parts of clean water, add 0.1 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed agitator for 2 hours; add 0.2 part of alkylphenol polyoxyethylene ether after uniform dispersion and dissolution, and fully stir for 15min; add modified hard 1.5 parts of husk 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 0.2 part of xanthan gum, 0.5 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, 0.1 part of sodium dodecyl sulfate, 2 parts of lignite resin and 1 part of phenolic resin Mix evenly, add the above temperature-resistant hard rubber base fluid while stirring, and stir with a low-speed strong mixer at 900 r / min for 6 hours to form a high-temperature hard rubber recyclable micro-foam drilling fluid or completion fluid.

Embodiment 2

[0074] Take 100 parts of clean water, add 0.2 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed mixer for 2 hours; after uniform dispersion and dissolution, add 0.2 part of polysorbate respectively, stir well for 15 minutes; add modified hard shell 1.5 parts of plant fiber powder, fully stirred for 5 minutes, and allowed 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 sodium sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, 0.1 part of sodium lauryl sulfate, 2 parts of potassium humate fluid loss reducer, and 1 part of sulfonated phenolic resin fluid loss reducer are mixed evenly, and the above temperature-resistant hard gum base liquid is added while stirring. / min stirring for 6h to form medium and high temperature hard ...

Embodiment 3

[0076] Take 100 parts of clean water, add 0.2 part of low molecular weight anti-high temperature foam stabilizer TFS to it, stir with a low-speed mixer for 2 hours; after uniform dispersion and dissolution, add 0.1 part of alkylphenol polyoxyethylene ether and 0.1 part of polysorbate respectively. , fully stirred for 15min; added 2 parts of modified hard-shell plant fiber powder, fully stirred for 10min, and stood for 2h to form a temperature-resistant hard glue base liquid. Accurately weigh 3 parts of sodium bentonite, 0.1 part of sodium carbonate, 0.1 part of xanthan gum, 0.3 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, 0.1 part of sodium dodecyl sulfate , 2 parts of lignite resin and 1 part of phenolic resin, mix them evenly, add the above temperature-resistant hard rubber base liquid while stirring, and stir with a low-speed strong mixer at 1000 r / min for 6 hours to form a medium-high temperature hard rubber recyclable micro-foam...

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Abstract

The invention discloses a medium-high temperature hard rubber recyclable foam drilling fluid and a preparation method thereof. Add low molecular weight anti-high temperature foam stabilizer to clear water. After dispersing and dissolving, add wetting agent and foam film density reducing agent successively. Stir well and let stand to ensure full swelling to form a temperature resistant hard base liquid. Accurately weigh the sodium bentonite, alkaline regulator, sulfonate polymer fluid loss reducer, foaming agent, temperature-resistant resin fluid loss reducer and foam surface viscosity regulator, mix them evenly, and add the temperature-resistant hard gum base while stirring. medium and high temperature hard rubber can be circulated in micro-foam drilling fluid or completion fluid. The medium and high temperature recyclable foam fluid of the invention has low solid phase content, strong membrane structure and excellent foam stabilization effect, and can resist saturated NaCl and 25% CaCl 2 , to increase the recirculation times of the completion fluid after the micro-foam drilling fluid, so that the recyclable micro-foam drilling and completion fluid can be safely and efficiently used in the exploitation of medium, high temperature and low pressure leaky oil and gas resources and geothermal wells.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging of drilling engineering, in particular to a foam drilling fluid or completion fluid which can withstand medium and high temperature around 150°C, has a strong membrane structure and can be recycled on the ground and in the wellbore and a preparation process thereof. Background technique [0002] Foam drilling fluid is a low-density key drilling fluid technology for low-pressure and malignant leakage formations. The main development is the inflatable foam drilling fluid technology and the recirculating foam drilling fluid technology. Circulating foam drilling fluid can reduce the density of drilling fluid without additional special equipment at the well site, just like water-based drilling fluid is circulated in the well and between drilling tools, so the stability of the foam is higher. If the formed microfoam has a longer half-life and more cycles at the bottom of the wel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/38C09K8/035C09K8/42
CPCC09K8/38C09K8/035C09K8/426C09K2208/08Y02E10/10
Inventor 杨倩云王宝田陈二丁严波赵红香杨华李琼
Owner 中石化石油工程技术服务有限公司
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