Abstract: A dosing apparatus for mixing additive fluid with a primary fluid to prepare a drilling fluid at a drilling site for use in a downhole drilling operation. The apparatus is of a size and weight that can be disposed on, in or in the vicinity of a fluid vehicle, drilling apparatus and/or drilling site. The dosing apparatus includes a dynamic mixer with at least a first primary fluid inlet, at least a first additive fluid inlet and at least a first drilling fluid outlet. The dynamic mixer is configured to receive and combine primary fluid and additive fluid to prepare drilling fluid. The dynamic mixer is configured or configurable to control the ratio of primary fluid to additive fluid in the prepared drilling fluid.

Abstract: A system (10) delivers of a flowable substance S to a remote location through a conduit (144). The system (10) has a body 12 with first and second portions (14,16) and at least two plugs (P1, P2) associated with the body (12) so that in a first configuration the plugs (P1, P2) are spaced apart and form a sealed region (20) for holding a volume of the substance S, and, in a second configuration at least the second plug (P2) is disposed in the second portion wherein the substance S can flow in a downstream direction past or through the second plug and out of the body (12).

Abstract: A system (10) delivers of a flowable substance S to a remote location through a conduit (144). The system (10) has a body 12 with first and second portions (14,16) and at least two plugs (P1, P2) associated with the body (12) so that in a first configuration the plugs (P1, P2) are spaced apart and form a sealed region (20) for holding a volume of the substance S, and, in a second configuration at least the second plug (P2) is disposed in the second portion wherein the substance S can flow in a downstream direction past or through the second plug and out of the body (12).