Method for no-grounding treatment and comprehensive utilization of oil-gas field downhole operation output solution

Abstract

The invention relates to a treatment and integrated utilization method for preventing the liquid output from the oil field and gas field underground operation from dropping on the ground, so that the liquid output from the oil field and gas field underground operation is received and enters into the process of the method to be treated through a sealing process when returning at the well head; after the oil, the gas, the sand and the mud contained in the output liquid are classified, refined and separated through the processes of gas-liquid separation, whirling sand removal, oil-water separation, regulating addition emulsion breaking air floating, and solid-liquid separation, the oil-gas overflows and is utilized; quite large water containing sand particles are cleaned with clean water and then used as building material after the solid-liquid separation process, and the mud with small grain size is made into cake shapes through pressure filtration for brick manufacturing, so that the output liquid can be recycled after being regulated and purified, so as to thoroughly solve the problems of preventing the liquid output from underground operation from dropping on the ground and the resource utilization, and does not bring any potential pollution.

Description

1. Technical field: [0001] The invention relates to a process technology for on-site treatment and comprehensive utilization of output fluid from downhole operations in oil and gas fields without falling to the ground, in particular to a method for non-falling treatment and comprehensive utilization of output fluid from downhole operations in oil and gas fields. Two: background technology: [0002] During downhole operations such as fracturing, acidizing, pumping, blowout, sand washing, and well washing in oil and gas fields, on the one hand, a large amount of water resources are needed to allocate these functional liquids; Produced fluids, these produced fluids have different production volumes and properties depending on the wellhead pressure and operating measures. Because they contain a large amount of oil, gas, mud, and sand, these produced fluids cannot be effectively separated on site and are discarded. Because these produced liquids contain a large amount of petroleu...

AI Technical Summary

Problems solved by technology

[0002] During downhole operations such as fracturing, acidizing, pumping, blowout, sand washing, and well washing in oil and gas fields, on the one hand, a large amount of water resources are needed to allocate these functional liquids; Produced fluids, these produced fluids have different production volumes and properties depending on the wellhead pressure and operating measures. Because they contain a large amount of oil, gas, mud, and sand, these produced fluids cannot be effectively separated on site and are discarded. Because these produced liquids contain a large amount of petroleum, chemical substances and salts, they not only cause air, soil, water and groundwater pollution, but also cause waste of resources and increase operating costs.

In order to solve the pollution and utilization of the produced fluid in downhole operations, relevant scientific and technical personnel have carried out some research on the three-phase separation of oil, water and sand, and achieved some results, such as the utility model patent "Oil, Water and Sand Three-phase Cyclone Separator" (ZL200420011278. 3), "A Kind of Oil-Gas-Water Separator" (ZL20052008981), "Sand Removal and Oil-Water Separation Device" (ZL99257965.1), "Swirl Air Floater for Oil-Water Separation" (ZL00252759.6), "Oil-Water-Sand Three-Phase Cyclone Flow Separation Device" (ZL200420112780.0), the development of oil-water-sand three-phase cyclone separator and its downhole application literature, etc., all involve the three-phase physical separation of oil, water and sand. Separation of oil-water-sand with low viscosity such as water is effective, and it does not involve acidification, acid fracturing, fracturing fluid and other high-viscosity production fluid treatment that requires chemical treatment such as adjustment and destabilization, and mud and sand treatment of stable systems with small particles The problem is that only by centrifugal cyclone physical separation, the sludge particles with small particle size (less than 0.25mm) cannot be removed, the separated liquid cannot meet the standard of comprehensive utilization, and the separated high-cement sand has no effect. The final treatment measures still have pollution problems, and some of these technologies only rely on wellhead energy without design power boosting. Under the premise of low wellhead pressure or overflow, cyclone centrifugation loses its separation effect, so all such technologies exist Inadequacies, the practicability of on-site application is poor, the scope of application is narrow, and it cannot meet the processing requirements of the diversity and complexity of the produced fluid

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