Separating gas and liquid in a wellbore

A method for separating a mixed-phase fluid, comprising:

• running a downhole tool into a wellbore, the downhole tool comprising:
• a first tubular comprising a volume defined between an open, uphole end of the first tubular opposite an open, downhole end of the first tubular,
• a second tubular comprising a volume that includes at least a portion of a downhole artificial lift device and is defined between an open, uphole end of the second tubular opposite a closed, downhole end of the second tubular, and
• a wellbore seal radially positioned around each of the first and second tubulars and between the first and second tubulars, and axially positioned between the uphole ends and the downhole ends of the respective first and second tubulars;
• receiving a flow of a mixed-phase fluid into the open, downhole end of the first tubular;
• separating, in the volume of the first tubular, the mixed-phase fluid into a flow of a gas and a flow of a liquid;
• directing the flows of the gas and the liquid out of the open, uphole end of the first tubular;
• selectively receiving the flow of the liquid into the volume of the second tubular through an adjustable opening positioned in the second tubular;
• filtering particulates entrained in the liquid with a particulate trap positioned in the closed, downhole end of the second tubular that is downhole of the wellbore seal;
• and
• removing, with the downhole artificial lift device, the flow of the liquid from the volume of the second tubular into a production tubing.