Main valve protector of shale gas production wellhead

Abstract

The invention relates to a main valve protector for a shale gas production wellhead, which includes a valve body. The main valve protector for a gas production wellhead also includes a mandrel and a lower flange arranged below the mandrel. The lower end is arranged in the lower flange, and the lower flange is fixedly connected with the valve body by bolts, and the upper end of the mandrel is provided with an upper flange, and a plurality of positioning nuts are arranged on the upper flange. A displacement lead screw is provided between the positioning nut and the lower flange, and multiple sets of seals are provided on the inner wall of the lower flange. By passing the mandrel through the valve core when fracturing occurs, the fracturing fluid is prevented from washing the valve core, thereby improving the service life of the manual flat valve and reducing development costs. At the same time, the invention has a simple structure, is convenient for installation and operation, has a large diameter, reduces frictional resistance and construction pressure, and achieves the purpose of safe production.

Description

technical field [0001] The invention relates to a main valve protector for a gas production wellhead, in particular to a main valve protector for a shale gas production wellhead. Background technique [0002] The development and application of wellhead protectors in China have been practiced and explored for many years. Since the "SY / T 5861-93 Fracturing Wellhead Protector" standard was promulgated in 1994, domestic wellhead protectors have been continuously improved. Before acid fracturing, the protector is installed on the upper part of the oil production spool, and is controlled by hydraulic pressure. Through the operation of the control box, the rubber cartridge seat is sealed in the double male short connection at the lower part of the oil pipe, and the oil fracturing construction is carried out to seal the oil tree to protect the oil tree from damage. Flushed by fracturing fluid and tested for sealing performance before work. Since the top of the protector is set as ...

AI Technical Summary

Problems solved by technology

Since the top of the protector is set as a hydraulic motor, which drives the lower sealing and short-circuit seat seal, and Fuling shale gas production uses the stimulation technology of perforating bridge plugging, fracturing and coiled tubing drilling plug cooperation, this kind of protector cannot be installed with pressure Fractured wellhead + coiled tubing wellhead

Shale layers can be used as source rocks and reservoir rocks for gas. Reservoirs have the characteristics of continuous distribution, low porosity, ultra-low permeability, and high brittleness. Connect the fracturing head for staged sand fracturing. The 1# large valve is washed by the high-pressure working fluid of the acid fracturing operation, which is prone to failure. The existing protectors cannot meet the requirements.

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