Water-based drilling fluid and preparing method thereof

A technology of water-based drilling fluid and smectite, applied in the field of drilling fluid, can solve problems such as abnormal drilling operations, difficult adjustment of rheological properties, and increased filtration volume

Active Publication Date: 2016-08-31
BEIJING INST OF EXPLORATION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the above-mentioned drilling fluids in the prior art often undergo changes such as degradation, thickening, and gelation of various components under high temperature conditions. For example, at high temperatures, bentonite will thicken or passivate, and bentonite and Excessive cross-linking between mud treatment agents leads to deterioration of drilling fluid performance and difficult adjustment of rheological properties; under high temperature conditions, polymer treatment agents will degrade and break molecular chains, resulting in a significant decrease in drilling fluid viscosity and cuttings carryover Insufficient capacity and increased fluid loss will lead to drastic changes in the performance of drilling fluid, making it difficult to adjust and control, and in severe cases, it will lead to the failure of normal drilling operations

Method used

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  • Water-based drilling fluid and preparing method thereof
  • Water-based drilling fluid and preparing method thereof
  • Water-based drilling fluid and preparing method thereof

Examples

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Effect test

Embodiment 1

[0093] (1) Water-based drilling fluid contains the following components:

[0094]

[0095] (2) Preparation method: add 10g of synthetic laponite to 400mL of water, stir at high speed for 20 minutes, and hydrate at room temperature for 16 hours to obtain the base slurry; add lignite into the high stirring cup containing the base slurry according to the formula under high-speed stirring Resin SPNH, fluid loss reducer KJAN, anti-slump agent and plugging agent, finally add barite to increase the density of drilling fluid to 1.2g / cm 3 , and continue to stir for 20 minutes to prepare water-based drilling fluid.

[0096] (3) The prepared drilling fluid performance is tested:

[0097] (a) The rheological properties and medium-pressure fluid loss of the high-temperature-resistant synthetic laponite water-based drilling fluid prepared at room temperature were tested with a six-speed rotational viscometer and a medium-pressure fluid loss meter.

[0098] (b) Put the water-based drill...

Embodiment 2

[0104] (1) Water-based drilling fluid contains the following components:

[0105]

[0106] (2) Preparation method: Add 14g of synthetic laponite to 400mL of water, stir at high speed for 20 minutes, and hydrate at room temperature for 16 hours to obtain the base slurry; add sulfur into the high stirring cup containing the base slurry according to the formula under high-speed stirring Lignite SMC, sulfonated phenolic resin SMP-I, anti-slump agent and plugging agent, finally add barite to increase the density of drilling fluid to 1.4g / cm 3, and continue stirring for 20 minutes to obtain a water-based drilling fluid.

[0107] (3) The prepared drilling fluid performance is tested:

[0108] (a) The rheological properties and medium pressure fluid loss of the newly prepared high temperature resistant synthetic laponite water-based drilling fluid were tested at room temperature using a six-speed rotational viscometer and a medium pressure fluid loss tester.

[0109] (b) Put the ...

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Abstract

The invention provides water-based drilling fluid and a preparing method thereof. The water-based drilling fluid avoids extra-added high temperature resistant thickening agent, high temperature resistant diluent and high temperature stabilizing agent or surface active agent and also has good filtration controlling performance, rheological property and high temperature stability at a high temperature of 220 DEG C. The method for preparing the water-based drilling fluid is convenient and easy to implement and suitable for drilling field use.

Description

technical field [0001] The invention relates to the technical field of drilling fluid in hot dry rock drilling, geothermal drilling, deep oil and gas resource drilling and deep scientific drilling, in particular to a high-temperature-resistant water-based drilling fluid. Background technique [0002] my country's shallow oil resources are almost exhausted, and the remaining oil and gas resources are mainly buried in deep strata, of which 70% of the deep oil and gas resources exceed 5,000 meters. In addition, with the continuous growth of human energy demand and increasing concern for environmental issues, people began to look for new types of renewable and non-polluting energy sources in deep formations, such as geothermal resources. It may be as high as 200°C or higher, and the drilling fluid in the well will be in a high-temperature environment for a long time. [0003] In the process of developing deep oil and gas resources and geothermal resources, drilling fluid plays ...

Claims

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Application Information

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IPC IPC(8): C09K8/14
CPCC09K8/145
Inventor 熊正强陶士先单文军付帆李晓东纪卫军李艳宁
Owner BEIJING INST OF EXPLORATION ENG
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