Polyhydroxyl hydrolyzed micelle acidolysis blockage removal agent and blockage removal technology

Abstract

The invention relates to a polyhydroxyl hydrolyzed micelle acidolysis blockage removal agent and a blockage removal technology. The polyhydroxyl hydrolyzed micelle acidolysis blockage removal agent is prepared by mixing the following compositions in percentage by mass: 0-30% of alcohol substances, 0-10% of polyethylene glycol, 1-40% of organic solvents, 0-20% of alkyl sulfonate, 0-20% of alkyl sulfobetain, 0-20% of polyoxyethylene ether, 0-20% of sorbitan monstearate, 0-20% of ammonium fluoride, 0-20% of organic acid, 0-20% of organic phosphonic acid, 0.5-2% of acidizing corrosion inhibitor, and the balance of industrial hydrochloric acid, then performing high-temperature high-speed stirring, adding other treating agents and evenly stirring; the blockage removal technology comprises the following steps: performing sand removal, injecting prepad fluid, then sequentially firstly injecting high-concentration polyhydroxyl hydrolyzed micelle acidolysis blockage removal agent solution and low-concentration polyhydroxyl hydrolyzed micelle acidolysis blockage removal agent solution, then injecting displacement fluid, finally injecting water to be filled in an oil pipe, reacting, and restoring the water injection. The blockage removal success rate is high.

Description

technical field [0001] The invention relates to an oil well and water injection well oil layer blockage removal problem in an oil field production system, in particular to a multi-hydrolysis micellar acid blockage removal agent and a blockage removal process. Background technique [0002] During the production process of the oil well in the oil field production system, due to various reasons in the production process, the oil layer will be blocked, the permeability will drop, and the production will drop. Second, due to the increase of water cut in the production process, the action of water washing and flow velocity causes the clay minerals in the oil layer to loosen and fall off, and the migration of particles occurs to block the oil layer; the third is the increase in water cut, and emulsification and blockage occur in the process of oil-water migration 4. Crude oil will cause high freezing point components and colloidal asphalt to separate out in the crude oil due to the...

AI Technical Summary

Problems solved by technology

[0002] During the production process of the oil well in the oil field production system, due to various reasons in the production process, the oil layer will be blocked, the permeability will drop, and the production will drop. Second, due to the increase of water cut in the production process, the action of water washing and flow velocity causes the clay minerals in the oil layer to loosen and fall off, and the migration of particles occurs to block the oil layer; the third is the increase in water cut, and emulsification and blockage occur in the process of oil-water migration ; Fourth, due to the temperature drop and degassing of crude oil in the near-well zone of the oil well, the high freezing point components and colloidal bitumen in the crude oil will be precipitated, and heavy oil will block the near-well zone

During the water injection process of the water injection well in the oil field production system, the water injection layer of the water injection well will be blocked due to water quality and unreasonable water injection process parameters, and the water injection volume will decrease or the water will not be injected. If it does not meet the standard requirements, the suspended matter content and oil content of the injected water itself exceed the standard, resulting in emulsified oil and clogged particles in the water injection layer of the water injection well; second, the injected water is highly corrosive, and the reproduction and proliferation of bacteria cannot be controlled, resulting in corrosion. A large amount of ferrous ions, combined with the hydrogen sulfide produced by bacterial reproduction and proliferation, forms ferrous sulfide precipitation, which leads to sediment clogging and bacterial metabolite clogging in the water injection layer of the water injection well; the third is that the injection water flow rate is too high during the injection process, resulting in the formation of rocks in the water injection layer. Particle migration blockage occurs; the fourth is that the washing effect of the water injection process causes the rock cement to detach, the rock cement strength decreases, and the clay minerals fall off, resulting in particle blockage; the fifth is the long-term water injection process, the tiny particles in the injected water migrate in the rock pores Gradually accumulate, absorb and deposit, so that the blockage of the water injection layer extends to the deep

[0003] Various acid solution plugging removal technologies developed at present can effectively remove the plugging near the wellbore, but the plugging removal effect on the deep oil layer of the injection well is very limited, especially in the case of mixed oil and mud plugging, the acid solution cannot be effective Penetrating into the blockage, the plugging removal effect is greatly reduced, and the success rate of plugging removal is about 50%.