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Temperature-resistant modified natural polymer drilling fluid

A technology of natural macromolecule and drilling fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of not discussing the optimization of antioxidants and stabilizers, and achieve the effect of maintaining aesthetics and improving temperature resistance.

Pending Publication Date: 2022-04-12
中石化石油工程技术服务有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with application number 201310523054.1 mentions the use of one of the antioxidant sodium bisulfite, sodium sulfite or sodium sulfide to improve the temperature resistance of the drilling fluid, but does not optimize the stabilizer, and does not discuss which antioxidant is used as a high-temperature The best stabilizer

Method used

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  • Temperature-resistant modified natural polymer drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to 100 parts of water, 1 part of sodium sulfide, 1 part of sodium formate, 1 part of monoethanolamine, 4 parts of bentonite, 0.75 parts of low-viscosity carboxymethyl cellulose purchased in the market, after stirring at high speed for 20 minutes, aging at 150 degrees for 16 hours, measure The results of the drilling fluid fluid loss after aging are shown in Table 1 below.

Embodiment 2

[0035] According to 100 parts of water, 1 part of sodium sulfide, 2 parts of sodium formate, 1 part of monoethanolamine, 4 parts of bentonite, and 0.75 parts of low-viscosity carboxymethyl cellulose purchased in the market, after stirring at high speed for 20 minutes, aging at 150 degrees for 16 hours, using The same method as in Example 1 was used to measure the fluid loss of the aging drilling fluid, and the results are shown in Table 1 below.

[0036] In Table 1, the configuration methods and performance tests of the drilling fluids in Examples 3-11, 18-19 and Comparative Examples 12-17 are the same as those in Example 1, see Table 1.

[0037] In the comparative example, one or more of formate, monoethanolamine and sodium sulfide were missing. Or in the comparative example, monoethanolamine is replaced by PEG8000, or sodium sulfide is replaced by sodium sulfite.

[0038]

[0039] surface Drilling fluid main component content and performance after aging in each embodi...

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Abstract

The invention discloses a combination of a cellulose filtrate reducer and a temperature-resistant stabilizer and a low-chroma natural polymer drilling fluid system formed by the combination. The high-temperature stabilizer disclosed by the invention comprises the following three components: sodium sulfide, formate and monoethanolamine, and can well play a high-temperature stabilizing role on the drilling fluid containing the cellulose filtrate reducer. The drilling fluid system disclosed by the invention can avoid using high-temperature-resistant fluid loss agents such as asphalt, sulfonated lignite and sulfonated phenolic resin in a high-temperature well, is beneficial to environmental protection and is also beneficial to cost reduction.

Description

technical field [0001] The invention relates to a high temperature resistant drilling fluid system, in particular to a drilling fluid system comprising a high temperature stabilizer for drilling fluid and a carboxymethyl cellulose fluid loss reducer. Background technique [0002] In oil and gas drilling, drilling fluid is necessary to carry cuttings, clean the wellbore, stabilize the well wall and prevent the well wall from collapsing. The technical difficulties faced by drilling fluids for deep wells and ultra-deep wells are becoming more and more prominent. Under complex geological conditions, deep well drilling fluids are faced with high temperature problems, and the formation temperature will exceed 100 degrees. If the temperature resistance of the drilling fluid is not strong, the filtration loss, one of the main properties of the drilling fluid, will be greatly increased, which will affect the stability of the well wall, and in serious cases will cause the well to col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20
Inventor 马云谦杨利梁子波张林伟郭先敏王涛曹婧付亚琼王悦宏丁珊珊于雷
Owner 中石化石油工程技术服务有限公司
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