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 . <EOS>