Lubricating collapse-resisting agent for drilling fluid and preparation method thereof

Abstract

The invention discloses a drill liquid lubricating anti-sloughing agent and preparation method thereof. The lubricating anti-sloughing agent is composed of liquid wax 10 to 30 parts, non-ionic surface activator 1 to 3 parts, polyatomic alcohol 5 to 15 parts, polymer 0.5 to 1 part according to 100 weight parts, and water as residue. The preparation method is: putting liquid wax, non-ionic surface activator, and polyatomic alcohol into reactor, heating the mixture to 60 deg C. to 80 deg C., agitating the mixture for 30min with agitation speed controlled in the ranged of 1000 to 2000 rpm; adding polymer-dissolved polymer into the reactor, agitating the mixture for 60 to 120 min continuously at 60 to 80 deg C. with agitation speed controlled in 1000 to 2000 rpm, cooling it to room temperature, to obtain the product of lubricating anti-sloughing agent. The lubricating anti-sloughing agent of the invention is provided with good stability, with excellent lubricating, anti-sloughing and oil gas layer-protecting effects in drilling liquid, and good environmental protection property without fluorescence, toxic pollution. The adopted materials are easy to obtain. The preparation method is simple, easy to implement with low cost.

Description

Technical field: [0001] The invention belongs to a lubricating anti-slump agent for drilling fluid in the oil drilling process. technical background: [0002] In the oil drilling process, in order to ensure that the drilling fluid has good lubricity and anti-slump performance, and prevent the occurrence of differential pressure sticking and well wall collapse, it is necessary to add a certain amount of lubricant and anti-slump agent to the drilling fluid. [0003] Most of the lubricants commonly used in the field are prepared by adding surfactants to crude oil or diesel oil. The production cost is relatively high, generally above 6,000 yuan / ton, and the existing lubricants have unsatisfactory lubricating performance under complex geological conditions, which affects drilling. The job goes on smoothly. At the same time, since crude oil or diesel oil has fluorescence, in order to discover oil and gas layers in time, such lubricants are not allowed to be used in the drilling p...

AI Technical Summary

Problems solved by technology

The cost of polyol anti-slump agents is high, and some products have a great impact on the performance of drilling fluids, causing foaming; asphalt-based anti-slump agents have good plugging performance, but have fluorescence, which is not suitable for use in exploration wells and pre-exploration wells; inorganic salt anti-slump agents Slumping agent, the cost is low, but it has an adverse effect on the performance of the drilling fluid, often resulting in an increase in the viscosity and fluid loss of the drilling fluid

[0004] In order to solve the wellbore stability and drilling fluid lubricity during the drilling process, the method of adding anti-slumping agent and lubricant at the same time is often used on site, but the simultaneous addition of anti-slumping agent and lubricant not only increases the cost of drilling fluid, but also increases the labor cost labor intensity, and at the same time complicate the composition of the drilling fluid and increase the difficulty of maintenance and handling