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Water-based drilling fluid resistant to 255°C ultra-high temperature and its construction technology

A water-based drilling fluid and ultra-high temperature technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve the problems of poor high temperature stability, rheology, and filtration loss control, and water-based drilling fluid technology Bottleneck and other problems, to achieve the effects of good ultra-high temperature lubricity, avoiding well wall collapse, and controllable fluid loss

Active Publication Date: 2015-11-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems of current high-temperature deep well drilling, the current water-based drilling fluid has poor high-temperature stability and difficult regulation of rheology and fluid loss, the present invention provides a high-density water-based drilling fluid resistant to ultra-high temperature and its construction technology
To solve the technical bottleneck of water-based drilling fluid under the harsh conditions of high temperature and high density in deep and ultra-deep wells

Method used

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  • Water-based drilling fluid resistant to 255°C ultra-high temperature and its construction technology
  • Water-based drilling fluid resistant to 255°C ultra-high temperature and its construction technology
  • Water-based drilling fluid resistant to 255°C ultra-high temperature and its construction technology

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Embodiment 1

[0057] 1.1 Formula: 400mL slurry water + 0.6g sodium carbonate + 0.4g sodium hydroxide + 8g sodium bentonite + 8g sepiolite + 1.2g ultra-high temperature medium molecular polymer fluid loss reducer + 12g sulfomethylated phenolic resin + 12g sulfomethylated lignite resin + 8g ultra-high temperature plugging and anti-slump agent + 0.8g ultra-high temperature polymer deflocculant + 2g sodium sulfite + 8g extreme pressure lubricant + 68g sodium chloride calcium chloride complex salt (sodium chloride: Calcium chloride = 6:1) + high-purity barite weighted to a density of 1.8g / cm 3 .

[0058] 1.2 Preparation method: add 0.6g sodium carbonate and 0.4g sodium hydroxide to 400mL slurry water, add 8g sodium bentonite and 8g sepiolite under stirring, stir at 12000rpm for 20 minutes, and seal the pre-water at 25℃±2℃ 24 hours to obtain base slurry; add ultra-high temperature medium molecular polymer fluid loss reducer, sulfomethylated phenolic resin and sulfomethylated lignite resin to the...

Embodiment 2

[0069] 2.1 Formula: 400mL slurrying water + 0.8g sodium carbonate + 0.4g sodium hydroxide + 16g sodium bentonite + 2.4g ultra-high temperature medium molecular weight polymer fluid loss reducer + 16g sulfomethylated phenolic resin + 16g sulfomethylated Lignite resin + 12g ultra-high temperature plugging and anti-slump agent + 0.4g ultra-high temperature polymer deflocculant + 1.6g ascorbyl palmitate + 8g white oil + high-purity barite weighted to a density of 1.35g / cm 3 .

[0070] 2.2 Preparation method: add 0.8g sodium carbonate and 0.4g sodium hydroxide to 400mL slurry water, add 16g sodium bentonite under stirring, stir at high speed for 20 minutes, and pre-hydrate for 24 hours at 25℃±2℃ to obtain the base. slurry; add ultra-high temperature medium-molecular polymer fluid loss reducer, sulfomethylated phenolic resin, sulfomethylated lignite resin, ultra-high temperature plugging prevention agent in turn according to the formula into the high stirring cup containing the base...

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Abstract

The invention relates to a 255 DEG C superhigh temperature resistant water-based drilling fluid and a construction process thereof. The drilling fluid comprises the following raw material in parts by weight: 100 parts of blending water, 0.1-0.3 part of a pH regulator, 1-4 parts of sodium bentonite, 0-4 parts of sepiolite, 0.2-1.2 parts of a superhigh-temperature middle-molecule polymer filtrate reducer, 0.05-0.6 part of superhigh-temperature polymer deflucculating agent, 2-6 parts of sulfomethylated phenolic resin, 2-6 parts of sulfomethylated walchowite, 1-4 parts of high-temperature plugging anti-collapse agent, 1-4 parts of a superhigh-temperature lubricant, 0.1-1.2 parts of a high-temperature stabilizer, 0-32 parts of an anti-salt / cream dissolving agent,and barites added to a required density. The invention also provides a construction process of the drilling fluid in the process of application. The 255 DEG C superhigh temperature resistant water-based drilling fluid disclosed by the invention is applied to deep well and ultra deep well drilling, and the applicable temperature is 245-255 DEG C. The drilling fluid is strong in stability under superhigh temperature conditions, good in rheological property and easy to control.

Description

technical field [0001] The invention relates to an ultra-high temperature resistant water-based drilling fluid and a construction process thereof, belonging to the technical field of oil and natural gas drilling fluids. Background technique [0002] According to the international general concept, wells with a depth of more than 4500m are called deep wells, wells with a depth of more than 6000m are ultra-deep wells, and wells with a depth of more than 9000m are ultra-deep wells. With the in-depth development of oil and natural gas exploration and development and the increasing expansion of the drilling industry to foreign markets, the number of deep and ultra-deep well drilling operations has increased year by year. High temperature deep well water-based drilling fluids face the following main technical problems: First, the high temperature stability (aging) of drilling fluids is particularly prominent. Under the action of high temperature, the main organic treatment agents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24E21B21/00E21B33/13
Inventor 黄维安邱正松王富伟徐加放江琳曹杰钟汉毅刘震寰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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