A method of removing solids from an oil well using a solids removal system, the method comprising the steps of: a. providing a solids removal system, the system comprising a fluidisation jetting head adapted to be located in a solids bed at a bottom of an oil well, a first elongate conduit extending from the head and connected to a supply of a fluidising liquid, a second elongate conduit extending from the head and connected to a solids separation unit, wherein the head comprises a plurality of fluid outlet nozzles in fluid communication with the first elongate conduit and an inlet for a fluidised mixture of solids in the fluidising liquid in fluid communication with the second elongate conduit, wherein the plurality of fluid outlet nozzles surround the inlet; b. locating the fluidisation jetting head in a solids bed at a bottom of the well, wherein the plurality of fluid outlet nozzles are downward facing; c. supplying the fluidising liquid at an absolute pressure of from 0.5 to 2.5 bar and a flow rate of from 50 to 250 l/min to the fluid outlet nozzles from the first elongate conduit extending upwardly from the head; d. jetting the fluidising liquid out of the fluid outlet nozzles downwardly to fluidise solids in the vicinity of the head within the fluidising liquid to form a fluidised mixture of the solids in the fluidising liquid; e. removing the fluidised mixture from the solids bed through the inlet of the head surrounded by the plurality of fluid outlet nozzles, the inlet being in fluid communication with the second elongate conduit extending upwardly from the head; and f. conveying the fluidised mixture along the second elongate conduit to the solids separation unit located above the well. a. providing a solids removal system, the system comprising a fluidisation jetting head adapted to be located in a solids bed at a bottom of an oil well, a first elongate conduit extending from the head and connected to a supply of a fluidising liquid, a second elongate conduit extending from the head and connected to a solids separation unit, wherein the head comprises a plurality of fluid outlet nozzles in fluid communication with the first elongate conduit and an inlet for a fluidised mixture of solids in the fluidising liquid in fluid communication with the second elongate conduit, wherein the plurality of fluid outlet nozzles surround the inlet; b. locating the fluidisation jetting head in a solids bed at a bottom of the well, wherein the plurality of fluid outlet nozzles are downward facing; c. supplying the fluidising liquid at an absolute pressure of from 0.5 to 2.5 bar and a flow rate of from 50 to 250 l/min to the fluid outlet nozzles from the first elongate conduit extending upwardly from the head; d. jetting the fluidising liquid out of the fluid outlet nozzles downwardly to fluidise solids in the vicinity of the head within the fluidising liquid to form a fluidised mixture of the solids in the fluidising liquid; e. removing the fluidised mixture from the solids bed through the inlet of the head surrounded by the plurality of fluid outlet nozzles, the inlet being in fluid communication with the second elongate conduit extending upwardly from the head; and f. conveying the fluidised mixture along the second elongate conduit to the solids separation unit located above the well.