Balancing piston seal assembly of mud pulser

Abstract

The invention discloses a balancing piston seal assembly of a mud pulser. The balancing piston seal assembly comprises an outer shell, a balancing piston, a lifting rod, a piston, a guide pipe and a top plug. The balancing piston is arranged in the outer shell, the interior of the outer shell is divided into a mud chamber and an oil chamber, the top plug is arranged in the mud chamber and provided with a mud flowing channel, the mud flowing channel is communicated with the mud chamber, the guide pipe penetrates through the balancing piston and is connected with the top plug, the lifting rod penetrates through the guide pipe and the top plug and stretches out of the top plug, and the position, at one end of the oil chamber, of the lifting rod and the piston are connected. The problems that a traditional rubber cup is not resistant to high temperature, the wall is thin and prone to being broken, fatigue strength is low, and the rubber cup is nondurable are solved, mud can be prevented from entering the pulser and damaging the pulser, the service life of the pulser is prolonged, and the assembly is resistant to high temperature, not prone to being punctured and deforming, good in sealing performance, long in service life, reliable and stable.

Description

technical field [0001] The invention relates to oil drilling equipment, in particular to a mud pulser balance piston sealing assembly. Background technique [0002] The top of the existing downhole mud pulser adopts a rubber cup structure (such as figure 1 with 2 As shown), the wall of this rubber cup is thin and easy to be pierced by sand, iron filings, etc. during the drilling process, causing the mud to enter the pulser and the fatigue strength is low and not durable, so that the pulser cannot work normally; at the same time, the rubber cup is easily deformed, Tightness decreases at high temperatures. The existing plastic cup structure has seriously affected the normal operation of MWD / LWD instruments. In addition, the current domestic plastic cup structure is used within 125°C. When the temperature is higher than 125°C, the instrument will not work stably. As the difficulty of oil extraction becomes higher and higher, the operating temperature of the instrument is req...

AI Technical Summary

Problems solved by technology

[0002] The top of the existing downhole mud pulser adopts a rubber cup structure (such as figure 1 and 2 As shown), the wall of this rubber cup is thin and easy to be pierced by sand, iron filings, etc. during the drilling process, causing the mud to enter the pulser and the fatigue strength is low and not durable, so that the pulser cannot work normally; at the same time, the rubber cup is easily deformed, Loss of tightness at high temperatures

The existing plastic cup structure has seriously affected the normal operation of MWD / LWD instruments. In addition, the current domestic plastic cup structure is used within 125°C. When the temperature is higher than 125°C, the instrument will not work stably.

Images