Hydrocarbon reservoir protective agent

Abstract

The invention provides a hydrocarbon reservoir protective agent, which is prepared from the following components in parts by weight: 8-12 parts of modified oil-soluble resin, 5-10 parts of microcrystalline fibers, 5-15 parts of corn-core powder, 40-50 parts of calcium hydrogen carbonate, 10-15 parts of potassium hydroxide, 8-10 parts of mica powder and 5-15 parts of grass meal. The hydrocarbon reservoir protective agent shows no fluorescence, enables drilling fluid not to permeate, and is less in drilling fluid filtrate; the reservoir protective agent has broad-spectrum plugging and bearing capacity; after being added into the drilling fluid, the reservoir protective agent can enable the immersion depth of the drilling fluid in 20-40-mesh simulated sandstone formation to be less than 5cm,and enables the drilling fluid to plug 0.4mm of artificial cracks; the pressure-bearing capacity of an impermeable mud cake formed within 2-4min is greater than 10MPa.

Description

technical field [0001] The invention relates to the technical field of oil and gas layer protection in petroleum drilling, in particular to an oil and gas layer protection agent. Background technique [0002] Before oil and gas layers are drilled, in the environment of oil and gas reservoirs, rock minerals and formation fluids are in a state of physical and chemical equilibrium. Drilling, well completion, well workover, water injection and production stimulation can change the original environmental conditions and change the equilibrium state, which may lead to a decline in the productivity of oil and gas wells and damage to oil and gas layers. The influencing factors of oil and gas layer damage include the lithology of the oil and gas layer itself, the properties of oil, gas and water fluids, and other causes of damage; it also includes various external operating conditions that reduce the original permeability of the oil and gas layer. With the deepening of oil and gas fi...

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Problems solved by technology

[0004] The present invention aims to solve the problem of high fluorescence level of the existing non-permeable oil and gas layer protection agent, large initial filtration loss of drilling fluid, and low acid solubility, and provides a new oil and gas layer protection agent, which has no fluorescence display and is easy to drill. There is no penetration of liquid, and the filtration loss of drilling fluid filtrate is small; it has a broad-spectrum plugging and pressure-bearing capacity. When added to drilling fluid, it can be immersed in a simulated sandstone formation of 20-40 mesh to a depth of less than 5cm, and can plug 0.4mm man-made fractures. , the pressure-bearing capacity of the non-permeable mud cake formed within 2 to 4 minutes is greater than 10MPa

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