The use of potassium formate drilling fluid is to protect the production cost of crude oil, with less input and more output
The protection effect of oil and gas layers is the most critical aspect to measure the performance of completion fluids. If the oil and gas layers cannot be well protected, even if the other properties are excellent, this kind of completion fluid is useless. The use of potassium formate drilling fluid can restore the core permeability to more than 80%, avoiding the pollution of oil and gas layers during drilling, and having a good effect of protecting oil and gas layers.
From the analysis of the structure and characteristics of potassium formate, the mechanism of potassium formate drilling fluid to stabilize the formation and protect the reservoir mainly shows:
(1) The filtrate of potassium formate drilling fluid has relatively high minerality, small surface tension, and good compatibility with the reservoir, which reduces the water sensitivity damage and water lock damage of low permeability reservoirs, which is beneficial to reservoir protection.
(2) HCOO - ion of potassium formate is absorbed by the positive charge of clay end face, which forms a barrier between the positive part and water, prevents hydration, stabilizes clay, reduces formation damage caused by sensitive minerals, and realizes the purpose of reservoir protection.
(3) The H COO- ion of potassium formate and water molecules can form hydrogen bonds, and have a strong "binding" ability to free water, which makes the drilling fluid filtrate viscosity higher and difficult to enter the formation.
(4) The filtrate activity of potassium formate drilling fluid is low. In ultra-low permeability reservoirs and mud shale formations, the principle of activity balance is used to achieve its inhibition, thereby protecting the reservoir.
(5) Potassium formate drilling fluid has strong inhibition, can better control the formation of slurry, reduce the content of useless solid phase in drilling fluid, appropriately reduce the density of drilling fluid, and protect the reservoir.
Potassium formate drilling fluid improves the drilling speed, reduces downhole complexity, shortens the drilling cycle, reduces the pollution of the drilling fluid to the oil and gas layer, achieves the purpose of reservoir protection, and plays a positive role in the stable and high production of the oil field.
The role and significance of oil and gas layer protection for the petroleum industry is obvious. The use of potassium formate drilling fluid is to protect the production cost of crude oil with less input and more output.
From the analysis of the structure and characteristics of potassium formate, the mechanism of potassium formate drilling fluid to stabilize the formation and protect the reservoir mainly shows:
(1) The filtrate of potassium formate drilling fluid has relatively high minerality, small surface tension, and good compatibility with the reservoir, which reduces the water sensitivity damage and water lock damage of low permeability reservoirs, which is beneficial to reservoir protection.
(2) HCOO - ion of potassium formate is absorbed by the positive charge of clay end face, which forms a barrier between the positive part and water, prevents hydration, stabilizes clay, reduces formation damage caused by sensitive minerals, and realizes the purpose of reservoir protection.
(3) The H COO- ion of potassium formate and water molecules can form hydrogen bonds, and have a strong "binding" ability to free water, which makes the drilling fluid filtrate viscosity higher and difficult to enter the formation.
(4) The filtrate activity of potassium formate drilling fluid is low. In ultra-low permeability reservoirs and mud shale formations, the principle of activity balance is used to achieve its inhibition, thereby protecting the reservoir.
(5) Potassium formate drilling fluid has strong inhibition, can better control the formation of slurry, reduce the content of useless solid phase in drilling fluid, appropriately reduce the density of drilling fluid, and protect the reservoir.
Potassium formate drilling fluid improves the drilling speed, reduces downhole complexity, shortens the drilling cycle, reduces the pollution of the drilling fluid to the oil and gas layer, achieves the purpose of reservoir protection, and plays a positive role in the stable and high production of the oil field.
The role and significance of oil and gas layer protection for the petroleum industry is obvious. The use of potassium formate drilling fluid is to protect the production cost of crude oil with less input and more output.
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