Modified fatty acid ester, preparation method and application thereof

Abstract

The invention relates to a drilling fluid finishing agent applied to the petroleum and natural gas drilling engineering, as well as a preparation process and application thereof. The modified fatty acid ester comprises the following raw materials in parts by weight: 1000 to 2000 parts of vegetable fatty acid, 50 to 250 parts of catalyst, 20 to 150 parts of nitric acid, 100 to 800 parts of methanol, 10 to 100 parts of surfactant and 25 to 100 parts of calcined lime. The modified fatty acid ester is used as the anti-seize lubricant of the drilling fluid. The invention has the advantages of low cost of the raw material, no pollution to the environment in the preparation process of the product, good lubricating property and no influence to the discovery of the oil-gas reservoir.

Description

Technical field: [0001] The invention relates to a drilling fluid treatment agent used in petroleum and natural gas drilling engineering, as well as its production process and application. Background technique: [0002] In oil and gas drilling engineering, drilling fluid plays a vital role, one of which is to lubricate drill bits and drilling tools and increase drilling speed. Therefore, drilling fluid lubricants have always been a research hotspot. [0003] Drilling fluid lubricants made of artificial synthesis and oil modification have gradually become the mainstream of drilling fluid lubricants since the 1990s. Some directly use oleic acid as a drilling fluid lubricant, which has a good lubricating effect, but severe foaming during use has a great impact on other properties of the drilling fluid. After use, the drilling fluid needs to be followed up. Bring great inconvenience; Some are modified with vegetable oils such as palm oil and cottonseed oil to make, but the fre...

AI Technical Summary

Problems solved by technology

Some directly use oleic acid as a drilling fluid lubricant, which has a good lubricating effect, but severe foaming during use has a great impact on other properties of the drilling fluid. After use, the drilling fluid needs to be followed up. It brings great inconvenience; some are modified with vegetable oils such as palm oil and cottonseed oil, but the freezing point is too high, so it is extremely inconvenient to use in winter

For the reduction of the extreme pressure lubrication coefficient, the currently used products generally can only reach 50% to 80%. Even if a large amount of drilling fluid lubricant is added to the drilling fluid, it still cannot meet the needs of complex wells

In addition, the cost of preparing drilling fluid lubricants from vegetable oil is relatively high, and compared with crude oil, the cost performance has no advantage