Liquid lubricating agent and drilling fluid

A lubricant and drilling fluid technology, applied in the field of petroleum drilling fluid, can solve the problems of reduced drilling safety, reduced safety, poor lubrication effect, etc.

Active Publication Date: 2018-10-09
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, solid lubricants are easily removed by solid control equipment during use, which reduces drilling safety
Liquid lubricants can be well mixed with drilling fluid, and there is no disadvantage that solid liquid lubricants are easily removed by solid control equipment and reduce safety. However, the lubrication effect is generally poor under high temperature conditions, and it is difficult to meet the requirements of modern drilling. needs

Method used

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  • Liquid lubricating agent and drilling fluid
  • Liquid lubricating agent and drilling fluid
  • Liquid lubricating agent and drilling fluid

Examples

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preparation example Construction

[0037] The present invention has no special requirements on the preparation method of the liquid lubricant, and the preparation method of the composition well known to those skilled in the art can be adopted. In the present invention, the preparation method of the liquid lubricant preferably includes: mixing the base oil, surfactant, carbon black and organic molybdenum compound to obtain the liquid lubricant. The present invention has no special requirements on the specific implementation of the mixing, and a mixing method well known to those skilled in the art can be used. In the present invention, the mixing temperature is preferably 50-60°C, more preferably 52-55°C; the mixing time is preferably 1-1.5h. The present invention mixes the raw materials under the temperature conditions, so that the components in the liquid lubricant can be mixed at a molecular level, so that the obtained liquid lubricant has better lubricating performance.

[0038] The present invention also pr...

Embodiment 1

[0048] With 60g white oil, 10g sorbitan monostearate (Span 60), 10g carbon black (particle size is 50~150 microns), 8.5g MoDTC, 1.5g MoDDP (the weight ratio of MoDTC and MoDDP is 5.7: 1) Mix uniformly at 50°C to obtain liquid lubricant R1.

Embodiment 2

[0050] 75g of diesel oil, 5g of sorbitan monooleate (Span 80), 15g of carbon black (with a particle size of 50-150 microns), 9g of MoDTC, and 1g of MoDDP (that is, the weight ratio of MoDTC to MoDDP is 9:1) Mix well at 60°C to obtain liquid lubricant R2.

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Abstract

The invention provides a liquid lubricating agent. Molybdenum dialkyldithiocarbamate and molybdenum dialkydithiophosphate are used as important ingredients of the liquid lubricating agent, and are oilsoluble organic molybdenum compounds; a secondary structure film can be formed on the friction surface at high pressure formed by contact of a drill tool and a well wall; damage cannot easily occur;good lubrication and friction reduction effects are achieved. In addition, carbon black in the liquid lubricating agent can form a thin slice layer; in the extrusion state, the carbon black thin sheetlayers are separated, so that better lubrication and friction reduction effects can be achieved; meanwhile, through surfactants, liquid lubricating agents form proper emulsification effects in a drilling fluid system, so that the liquid lubricating agent can be sufficiently and uniformly dispersed; the lubrication and friction reduction capability is improved. The invention also provides drillingfluid, which is prepared from the liquid lubricating agent. The lubrication and friction reduction effects are good at the high temperature.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluid, in particular to a liquid lubricant and a water-based drilling fluid. Background technique [0002] During drilling and well completion operations, there will be friction between the drilling tool and the well wall and casing, and between the drilling fluid and the drilling tool, the well wall and the casing wall. During the drilling process of horizontal wells and directional wells, the action of gravity causes cuttings and drilling tools to accumulate to the lower part of the well wall, which further increases the contact area between drilling tools and cuttings, resulting in an increase in torque and friction, resulting in Downhole complex accidents such as drill sticking. The quality of drilling fluid is the key to the success of the entire drilling project. Lubricants can greatly reduce the frictional resistance of drilling fluids. Therefore, during the drilling process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/22
CPCC09K8/03C09K8/22C09K2208/28C09K2208/34
Inventor 邵宁于培志安玉秀
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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