High frequency pressure compensator

Abstract

A downhole pressure compensation system includes a seal housing disposed in a downhole tool, a dynamic seal disposed on the seal housing, wherein the dynamic seal seals around a part that is allowed to move relative to the seal housing, and a flexible membrane disposed in a sidewall of the seal housing proximate the dynamic seal.

1 . A downhole pressure compensation system, comprising: 
 a seal housing disposed in a downhole tool;    a dynamic seal disposed on the seal housing, wherein the dynamic seal seals around a part that is allowed to move relative to the seal housing; and    a flexible membrane disposed in a sidewall of the seal housing proximate the dynamic seal.    
   
   
       2 . The downhole pressure compensation system of  claim 1 , wherein the flexible membrane is in fluid communication with a fluid inside the seal housing via a fluid passage.  
   
   
       3 . The downhole pressure compensation system of  claim 1 , further comprising a second pressure compensation system comprising a piston disposed in a cylinder.  
   
   
       4 . The downhole pressure compensation system of  claim 1 , further comprising a second pressure compensation system comprising a bladder.  
   
   
       5 . The downhole pressure compensation system of  claim 1 , wherein the downhole tool is a mud pulse telemetry pulse generator.  
   
   
       6 . The downhole pressure compensation system of  claim 1 , wherein the flexible membrane comprises a frustoconical section of the seal housing.  
   
   
       7 . The downhole pressure compensation system of  claim 1 , wherein the flexible membrane is constructed of an elastomer.  
   
   
       8 . The downhole pressure compensation system of  claim 1 , wherein the flexible membrane is constructed of a metal.  
   
   
       9 . A method of compensating for a mud pressure signal, comprising: 
 generating a pressure signal in a mud flow rate; and    transmitting the pressure to the inside of a seal housing through a flexible membrane disposed on a seal housing proximate a dynamic seal.