Lubrication blocking agent used for drilling fluid and preparation method thereof

Abstract

The present invention relates to a lubrication blocking agent used for drilling fluid comprising the following raw materials in parts by weight: 20 to 40 parts of water, 3 to 8 parts of bentonite, 20 to 30 parts of a lubricant, 1 to 3 parts of a stabilizer, 20 to 40 parts of bitumen, 1 to 5 parts of a bitumen modifier, 0.1 to 1 part of a PH adjusting agent, 2 to 4 parts of an antifreeze, 2 to 4 parts of a surfactant, and 1 to 3 parts of a defoamer. Compared with the prior art, the beneficial effects are that: (1) the lubrication blocking agent can effectively improve drilling fluid system deformable particle content, and has good ability to block rock stratum, especially shale stratum prone to collapse, deep stratum prone to collapse, salt gypsum mud complex formation and other formations, and has good ability to block 10mum microcracks; (2) the applicability is good, the lubrication blocking agent can be compatible with a variety of drilling fluid processing agents, and can be widely used in fresh water, sea water and high concentration brine drilling fluid systems; (3) the lubricity is good; (4) the lubrication blocking agent has the role of filtrate loss reduction; and (5) and the lubrication blocking agent is easy to use and short in preparation period.

Description

technical field [0001] The invention relates to the field of petroleum technology, in particular to a lubricating and plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] With the acceleration of oil exploration and development in my country, the number and difficulty of drilling directional wells and horizontal wells are increasing, the wellbore is deep, the ground temperature is high, and the geological conditions are complex; It will cause complex accidents such as downhole collapse and drill sticking, resulting in accidents and complex situations, and in serious cases, it will cause well filling or the entire well to be scrapped. To solve these problems, it is necessary to choose a drilling fluid with excellent performance. The role of drilling fluid in drilling operations and protecting oil and gas layers and the strict requirements on drilling fluid in various aspects have prompted the rapid development of drilling fluid tech...

AI Technical Summary

Problems solved by technology

[0005] However, these commonly used lubricants for drilling fluids are mostly solid, and solid lubricants have some disadvantages: 1. The friction coefficient of solid lubricants is large, generally 50 to 100 times larger than that of lubricating oil, and larger than that of grease lubrication. 100 to 500 times; 2. Due to the difficulty of heat conduction, the temperature of the friction parts is easy to rise; 3. It will produce wear debris and other pollution on the friction surface; 4. Sometimes noise and vibration will be generated; 5. The preparation time of solid lubricants is long, Inconvenient to use; therefore, we need a new type of solid lubricant for drilling fluid