Plunger gas-lifting draining device used for horizontal gas well and production method

Abstract

The invention discloses a plunger gas-lifting draining device used for a horizontal gas well and a production method. The device comprises a self-buffering plunger and a uniflow device which are arranged in an oil pipe, the oil pump comprises two sections of pipelines who have different pipe diameters and are connected by a reducing short section, the self-buffering plunger is arranged in the part, which is located at the upper part of the reducing short section, of the pipeline, the uniflow device is used for controlling a gas liquid to flow unidirectionally from bottom to top and arranged inthe part, located at the lower part of the reducing short section, of the pipeline, the shaft accumulated fluid can be lifted to the upper part of the uniflow device by the own energy of the gas well, is delayed, and is lifted to the well mouth by the aid of the self-buffering plunger, and drainage production is completed. A downhole tool of an existing plunger device is simplified; the functionof gas liquid unidirectional flow is realized by the uniflow device, the structure is simple and easy to put and slave, the own lifting capacity of the gas well is effectively utilized, the shaft accumulated fluids of the horizontal gas well bottom part inclined shaft part and horizontal section are lifted, the shaft liquid column height is reduced greatly, the gas yield is increased, and the horizontal gas well draining gas production difficulty is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of gas production in gas fields, and in particular relates to a plunger gas-lift liquid drainage device and a production method for horizontal gas wells. Background technique [0002] There are currently more than 1,300 horizontal gas wells in the Changqing gas area of ​​the Ordos Basin, and it is estimated that the number will reach 2,700 in 10 years. Gas wells with gas production below 20,000 m3 / d will account for 76.7%, and the problem of liquid accumulation is gradually emerging. [0003] The plunger gas lift liquid drainage technology uses the plunger as the gas-liquid separation interface, which can effectively prevent the gas from moving up and the liquid from slipping, and increase the efficiency of liquid lifting. In addition, this technology does not require chemical agents and is environmentally friendly. Foreign countries believe that the plunger gas lift technology is the most economical and eff...

AI Technical Summary

Problems solved by technology

Since the horizontal well deviates gradually from the kick-off point to the window entry point at the bottom of the well, the existing downhole tools are difficult to enter the highly deviated well section, and cannot be locked in the highly deviated well section, so they can only be used in vertical wells part

Moreover, the tubing of most horizontal wells in the Changqing gas area will shrink in diameter before entering the horizontal section at the bottom of the well, and the plunger cannot pass through this place during the falling process. The effusion cannot be lifted, which means that the full wellbore effusion cannot be lifted in horizontal wells, which seriously affects the efficiency of plunger gas lift drainage

Therefore, the existing plunger gas lift technology has limited effect in horizontal well drainage.

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