Patent ID: 10844680

Abstract:
A downhole apparatus and method for expelling fluid which comprises a container defining a void which is separated into three separate sections by a floating piston and control member, each having a dynamic seal. A portion of the container defining one of the void sections has a different cross-sectional area than the portion of the container defining another void section. In use, a fluid to be expelled is provided in one void section, and a reduced pressure (compared to the well) is sealed in another void section. The apparatus also comprises a wireless electromagnetic or acoustic receiver. When a signal is received by the wireless receiver to activate the apparatus, a valve or other mechanism maybe activated to release the floating piston and connected control member such that the lower pressure void and differing cross-sectional areas of the container drives and expels fluid out of the apparatus. The apparatus thus allows fluid to be expelled from the container using a reduced rather than an elevated pressure in the container. Apparatus with reduced pressures can be safer to use compared to those with elevated pressures. The apparatus may be used to deliver chemicals such as a breaker fluid, tracer, acid treatment, chemical barrier or precursors to a chemical barrier into a well or reservoir.