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Medium-high temperature ebonite 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, insufficient temperature resistance, and low number of cycles, etc., to protect oil and gas layer, saving preparation time, low solid content

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] 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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  • Medium-high temperature ebonite recyclable foam drilling fluid and preparation method thereof
  • Medium-high temperature ebonite recyclable foam drilling fluid and preparation method thereof
  • Medium-high temperature ebonite recyclable foam drilling fluid and preparation method thereof

Examples

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Effect test

Embodiment 1

[0072] 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 0.2 part of xanthan gum, 0.5 part of sulfonate polymer fluid loss reducer, 0.2 part of sodium dodecylbenzenesulfonate, 0.1 part of sodium lauryl sulfate, 2 parts of lignite resin, and 1 part of phenolic resin Mix evenly, add the above-mentioned temperature-resistant hard rubber base fluid while stirring, and stir with a low-speed strong agitator at 900r / min for 6 hours to form a high-temperature hard rubber that can circulate micro-foam drilling fluid or completion fluid.

Embodiment 2

[0074] 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 sodium 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 Stir for 6 hours to fo...

Embodiment 3

[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; after uniform dispersion and dissolution, add 0.1 part of alkylphenol polyoxyethylene ether and 0.1 part of polysorbate , fully stirred for 15 minutes; added 2 parts of modified hard shell vegetable fiber powder, fully stirred for 10 minutes, and stood for 2 hours to form a temperature-resistant hard gum 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 control agent, 0.2 part of sodium dodecylbenzenesulfonate, and 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 liquid while stirring, and stir with a low-speed strong mixer at 1000r / min for 6 hours to form a medium-high temperature hard rubber ...

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Abstract

The invention discloses a medium-high temperature eboniterecyclable foam drilling fluid and a preparation method thereof. The preparation method comprises the following steps: adding a low-molecular-weight high-temperature-resistant foam stabilizer into clear water, sequentially adding a wetting agent and a bubble film density lightening agent after dispersing and dissolving, uniformly conducting stirring, and conducting standing to ensure that the foam stabilizer is fully swelled, so as to form a temperature-resistant hard glue base solution; and accurately weighing 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, uniformly conducting mixing, and adding the mixture into the temperature-resistant ebonite base solution while stirring to form the medium-high temperature ebonite recyclable micro-foam drilling fluid or completion fluid. The medium-high-temperature recyclable foam fluid is low in solid phase content, strong in membrane structure, excellent in foam stabilizing effect and capable of resisting saturated NaCl and 25% CaCl2, the number of recyclable times of completion fluid after micro-foam drilling fluid is increased, and the safe and high-effect recyclable micro-foam drilling and completion fluid is used for exploitation of medium-high-temperature low-pressure easily-leaking oil and gas resources, geothermal wells and the like.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging in drilling engineering, in particular to a foam drilling fluid or well completion fluid that is resistant to medium and high temperatures around 150°C, has a strong membrane structure, and can be recycled on the ground and in wellbores 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 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 circulated in the well and between drilling ...

Claims

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Application Information

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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