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Micro emulsion nanometer drilling fluid for stable unconventional reservoir

A drilling fluid and microemulsion technology, applied in the field of drilling, can solve the problems that the performance of the drilling fluid needs to be further improved, the influence of the drilling fluid is great, and the performance of the drilling fluid is not good, so as to reduce the instability of the rock wall, shorten the drilling cycle, low friction effect

Inactive Publication Date: 2019-06-28
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Drilling fluid refers to the circulating flushing medium used in the hole during the drilling process. The performance of the drilling fluid, such as viscosity, shear force, and fluid loss, has a great influence on the drilling equipment in the process of drilling unconventional reservoirs. The performance of the drilling fluid is not good. Well, it is easy to cause wellbore instability. Wellbore instability has always been a big problem in the oil industry. It exists in many oilfields around the world and has not been solved well. According to conservative estimates, dealing with wellbore instability The time consumed accounts for about 5-6% of the total drilling time, and causes a loss of US$500-600 million to the world oil industry every year. The application of existing nano-materials in drilling fluids and completion fluids can effectively solve the problem of drilling with well wall stability. problems, but the performance of drilling fluid needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A microemulsion nano-drilling fluid for stabilizing unconventional reservoirs. In parts by weight, the drilling fluid includes: 100 parts of water, 1 part of bentonite, 0.5 part of sodium carbonate, 0.5 part of sodium hydroxide, 1 part of microemulsion, 0.1 part of yellow Raw rubber, 0.5 parts fluid loss reducer, 0.5 parts plugging agent, 0.5 parts lubricant;

[0024] The preparation method of the microemulsion is: take acrylamide, potassium persulfate, and dipropylene glycol dimethyl ether in a weight ratio of 200:1:10, mix them, place them at a temperature of 70°C and stir for 2 hours to form the first solution, and then mix them by weight Stir and mix the first solution, rhamnolipid, hexamethyl phosphate and water at a ratio of 100:1:1:40 to form a second solution. Under a nitrogen protective atmosphere, mix the second solution at a weight ratio of 200:1:0.5 Solution, glyceryl tristearate, and benzoyl peroxide were mixed and ultrasonicated for 5 hours at an ultrasoni...

Embodiment 2

[0028] A microemulsion nano drilling fluid for stabilizing unconventional reservoirs, in parts by weight, the drilling fluid includes: 150 parts of water, 3 parts of bentonite, 1 part of sodium carbonate, 1 part of sodium hydroxide, 2 parts of microemulsion, 0.3 part of yellow Original rubber, 1 part fluid loss reducer, 1.5 parts plugging agent, 1 part lubricant;

[0029] The preparation method of the microemulsion is: take acrylamide, potassium persulfate, and dipropylene glycol dimethyl ether in a weight ratio of 200:1:15, mix them, place them at a temperature of 70°C and stir for 2 hours to form the first solution, and then mix them by weight Stir and mix the first solution, rhamnolipid, hexamethyl phosphate and water at a ratio of 100:1:1:40 to form a second solution. Under a nitrogen protective atmosphere, mix the second solution at a weight ratio of 200:1:0.5 Solution, glyceryl tristearate, and benzoyl peroxide were mixed and ultrasonicated for 8 hours at an ultrasonic f...

Embodiment 3

[0033] The microemulsion nano drilling fluid for stabilizing unconventional reservoirs, in parts by weight, the drilling fluid includes: 120 parts of water, 2 parts of bentonite, 0.8 part of sodium carbonate, 0.7 part of sodium hydroxide, 1.5 parts of microemulsion, 0.2 part of yellow Original rubber, 0.8 parts of fluid loss reducer, 1 part of sealing agent, 0.8 parts of lubricant;

[0034] The preparation method of the microemulsion is: take acrylamide, potassium persulfate, and dipropylene glycol dimethyl ether in a weight ratio of 200:1:12, mix them, place them at a temperature of 70°C and stir for 2 hours to form the first solution, and then mix them by weight Stir and mix the first solution, rhamnolipid, hexamethyl phosphate and water at a ratio of 100:1:1:40 to form a second solution. Under a nitrogen protective atmosphere, mix the second solution at a weight ratio of 200:1:0.5 solution, glyceryl tristearate, and benzoyl peroxide were mixed and ultrasonicated for 6 hours...

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Abstract

The invention discloses a micro emulsion nanometer drilling fluid for the stable unconventional reservoir. The drilling fluid is prepared from, by weight, 100-150 parts of water, 1-3 parts of bentonite, 0.5-1 part of sodium carbonate, 0.5-1 part of sodium hydroxide, 1-2 parts of a micro emulsion, 0.1-0.3 part of xanthan gum, 0.5-1 part of a fluid loss agent, 0.5-1.5 parts of a blocking agent and 0.5-1 part of a lubricating agent. The drilling liquid has the advantages that the rheological property of the drilling liquid is improved, and the filter loss is reduced.

Description

technical field [0001] The invention relates to the field of well drilling. More specifically, the present invention relates to a microemulsion nano drilling fluid for stabilizing unconventional reservoirs. Background technique [0002] Unconventional oil and gas resources exist in large-scale oil accumulations, which are not significantly affected by hydrodynamic effects, including coalbed methane, tight sandstone gas, shale gas, basin center gas, etc. Unconventional reservoirs are characterized by micropores, Nanopores are the mainstay, and the pore-throat structure is complex. Since the 21st century, the world economy has entered a new development cycle, and the demand for oil and natural gas resources in various countries has risen sharply. It is necessary to make better use of unconventional oil and gas resources. Then, the exploitation of unconventional oil and gas reservoirs Resource equipment needs to be improved, and drilling fluid is the material needed to exploit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C09K8/514
Inventor 刘亚东孙晓东王良超陈琰
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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