Automatic chemical adding device and chemical adding method under foam drainage gas recovery well

Abstract

The invention discloses an automatic chemical adding device and a chemical adding method under a foam drainage gas recovery well. The automatic chemical adding device comprises a foam drainage agent chemical tank and a defoaming agent chemical tank which are arranged on the ground, wherein the foam drainage agent chemical tank is connected with a control box through a foam drainage agent chemicaladding pipe; a rotating device is arranged in the control box; a stirring device is arranged outside the rotating device in a sleeving manner; the stirring device penetrates through the control box; aflow guide funnel is also arranged in the control box; a chemical outlet is formed in a position, corresponding to the bottom of the flow guide funnel, of the bottom surface of the control box; a flow regulating valve is arranged at the chemical outlet; the defoaming agent chemical tank is connected with a defoaming cavity through a defoaming agent chemical adding pipe; a chemical flow dividing device is arranged at the upper part of the defoaming cavity; and at least one stirring device is arranged at the lower part of the defoaming cavity. The automatic chemical adding device disclosed by the invention can automatically add or stop adding a foam drainage agent according to the gas well liquid accumulation degree, and can also well defoam foam discharged out of a well mouth to prevent adownstream pipe network from being damaged.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas development, in particular to an automatic dosing device and a dosing method for a foam drainage gas production well downhole. Background technique [0002] Natural gas wells in my country generally produce water. When a gas well enters the middle and late stages of production, the gas production decreases, gas-liquid slippage is serious, and water flows back to the bottom of the well to form fluid accumulation, which may easily cause the gas well to "flood" and stop production. Foam drainage gas production well is one of the most economical and effective ways to prevent gas wells from accumulating liquid and maintain stable production of gas wells. It injects an appropriate amount of foaming agent into the wellbore, so that the bottom-hole fluid can generate stable foam under the action of air flow, thereby reducing gas-liquid slippage and discharging fluid. [0003] However, t...

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Problems solved by technology

[0003] However, the current foaming agent filling process faces three problems. One is that it is impossible to obtain real-time information on the fluid accumulation in the well before adding the drug, and it is difficult to determine the best timing for adding the drug; It is difficult to reach the predetermined position and cannot be fully mixed with the fluid at the bottom of the well; the third is that when the foam is discharged from the wellbore, the defoamer is not injected in time, and the foam cannot be defoamed in time, causing the bubbles to enter the downstream pipe network

This will bring about the following consequences: (1) If the fluid at the bottom of the well increases rapidly and the dosing is not timely, the gas well may be flooded rapidly; (2) If the fluid at the bottom of the well is small, excessive dosing will not only cause waste of chemicals, Excess chemicals will also become part of the effusion, increasing the burden of drainage; (3) The concentration of the medicament at the bottom of the effusion is too low, and the amount of foam generated is insufficient to fully drain the liquid; (4) The foam does not defoam in time and enter the downstream pipe network , causing heavy losses to the downstream pipeline network, requiring a large amount of manpower for construction and maintenance

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