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Method for regulating temperature of drilling fluid based on paraffin materials

A drilling fluid and drilling fluid circulation technology, which is used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., can solve the cost measurement deviation and drilling tool without considering the high temperature resistance of drilling tools and equipment while drilling , high cost and other problems, to achieve the effect of small phase change latent heat loss, lower drilling cost, and convenient use

Inactive Publication Date: 2020-11-06
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a series of process equipment, high cost and additional heat exchange medium
[0007] Chinese patent CN108276975A discloses a technology to improve the performance of drilling fluid by adding different high-temperature stabilizers. By adding high-temperature stabilizers, the drilling fluid can withstand the high-temperature environment of 240°C, but this method only considers the high-temperature environment of the drilling fluid. However, the cost of high temperature resistance of drilling tools and equipment while drilling and the measurement deviation at high temperatures are not considered, and the problem of high-cost drilling tools is still faced

Method used

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  • Method for regulating temperature of drilling fluid based on paraffin materials
  • Method for regulating temperature of drilling fluid based on paraffin materials
  • Method for regulating temperature of drilling fluid based on paraffin materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Adding 60°C phase-change paraffin wax to high-temperature drilling fluid for cooling performance.

[0034] Heat the drilling fluid to 80°C to maintain a constant temperature, add phase-change paraffin, wait until the phase-change paraffin is completely melted, lower the temperature of the drilling fluid below the phase-change temperature of the phase-change paraffin, and then the phase-change paraffin will solidify, then take out the phase-change paraffin, Then continue heating to 80°C, and then re-add phase-change paraffin. Depend on figure 1 It can be seen that after adding phase-change paraffin to pure drilling fluid, the temperature of the drilling fluid will decrease. After the phase-change paraffin is melted, the experiment is repeated, and the cooling performance of the phase-change paraffin is not affected.

[0035] The phase-change paraffin and drilling fluid are heated together to obtain a curve as figure 2 It can be seen from the comparison of t...

Embodiment 2

[0036] Example 2: The effect of adding phase-change paraffin at 140°C on the temperature and performance of drilling fluid.

[0037] Heat the drilling fluid to 180°C to maintain a constant temperature, add phase-change paraffin, wait until the phase-change paraffin is completely melted, lower the temperature of the drilling fluid below the phase-change temperature of the phase-change paraffin, and then the phase-change paraffin will solidify, then take out the phase-change paraffin, Then continue heating to 180°C, and then re-add phase-change paraffin. Depend on Figure 4 It can be seen that after adding phase-change paraffin to pure drilling fluid, the temperature of the drilling fluid will decrease. After the phase-change paraffin is melted, the experiment is repeated, and the cooling performance of the phase-change paraffin is not affected.

[0038] The phase-change paraffin and drilling fluid are heated together to obtain a curve as Figure 5 It can be seen from the comp...

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Abstract

The invention relates to a method for regulating the temperature of drilling fluid based on paraffin materials. According to the basic technical scheme, the method comprises the following steps that (1) the paraffin materials, preferably suitable for drilling fluid applications, are synthesized; (2) the paraffin materials are taken as drilling fluid treating agents, the addition amount is kept at5% to 20%, and the temperature can be reduced by 5 DEG C-15 DEG C; and (3) the materials can be reused by means of microcapsule coating and the like. The method has the advantages that in the drillingfluid circulation process, paraffin can generate phase change, and heat can be fully absorbed through the latent heat of phase change of the paraffin; and after the drilling fluid circulates to the ground, the paraffin can be re-solidified along with the reduction of the temperature to release heat, and no additional cooling medium is needed.

Description

technical field [0001] The invention relates to a high-temperature drilling fluid cooling technology in the field of high-temperature drilling technology. This technology can overcome the passivity of the previous high-temperature drilling technology, actively cool down the drilling fluid, and reduce the technical cost of high-temperature drilling. It is a new high-temperature drilling technology. technology. Background technique [0002] With the development of drilling technology and the rise of new energy sources, more and more high-temperature formations appear. The bottom hole temperature of some high-temperature wells such as hot dry rock and geothermal wells in my country is above 200°C, and some even exceed 300°C. [0003] The high temperature of the drilling fluid has a very serious negative impact on the drilling process. For the drilling fluid itself, the high temperature will cause the high temperature of the treatment agent to fail, affect the stability of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B36/00E21B21/06
CPCE21B36/001E21B21/06
Inventor 陈二丁王成文夏冬袁丽赵红香刘均一
Owner CHINA PETROCHEMICAL CORP