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255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof

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 technical bottleneck of water-based drilling fluid, difficult control of rheology and fluid loss, and high temperature stability In order to avoid the problems of poor fluidity and other problems, the effects of avoiding well wall collapse, controllable fluid loss, and good ultra-high temperature lubricity are achieved.

Active Publication Date: 2013-06-19
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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  • 255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof
  • 255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof
  • 255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof

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Embodiment 1

[0057] 1.1 Formula: 400mL mixing 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 compound salt (sodium chloride: Calcium chloride = 6:1) + high-purity barite aggravated 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 mixing water, add 8g sodium bentonite and 8g sepiolite under stirring, stir at 12000rpm for 20 minutes at high speed, and seal the prewatering at 25℃±2℃ After 24 hours of melting to obtain the base slurry; under high-speed stirring at 12000rpm, add ultra-high temperature medium molecular polymer fluid...

Embodiment 2

[0069] 2.1 Formula: 400mL mixing water + 0.8g sodium carbonate + 0.4g sodium hydroxide + 16g sodium bentonite + 2.4g ultra-high temperature medium molecular polymer fluid loss additive + 16g sulfomethylated phenolic resin + 16g sulfomethylated Lignite resin + 12g ultra-high temperature plugging and anti-slumping 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 preparation water, add 16g sodium-based bentonite under stirring, stir at high speed for 20 minutes, and pre-hydrate in airtight at 25°C±2°C for 24 hours to obtain the base Under high-speed stirring, add ultra-high temperature medium molecular polymer fluid loss reducer, sulfomethylated phenolic resin, sulfomethylated lignite resin, ultra-high temperature plugging anti Collapsing agent, ultra-high temperature polym...

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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 called ultra-deep wells, and wells with a depth of more than 9000m are called 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 problem of high-temperature stability (aging) of drilling fluids is particularly prominent. Under the effect of high temperature, the main ...

Claims

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Application Information

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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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