Systems for improving downhole separation of gases from liquids while producing reservoir fluid

A reservoir fluid production system for producing reservoir fluid from a subterranean formation, comprising:

• a wellbore including an uphole portion and a downhole portion;
• a wellbore string that is lining the wellbore;
• wherein:
• the wellbore string includes a wider intermediate section and an uphole-disposed section that is disposed uphole relative to the wider intermediate section;
• the uphole-disposed section includes a narrower uphole-disposed section;
• and
• the wider intermediate section is wider relative to the narrower uphole-disposed section;
• and
• a reservoir fluid production assembly disposed within wellbore string such that an intermediate wellbore passage is defined within a space between the wellbore string and the assembly and is extending longitudinally through the wellbore, wherein the assembly includes
• wherein:
• the wellbore string and the reservoir fluid production assembly are co-operatively configured such that, while the wellbore string is receiving reservoir fluid from the subterranean formation, the reservoir fluid is conducted uphole to the reservoir fluid separation space, with effect that a gas-depleted reservoir fluid is separated from the reservoir fluid within the reservoir fluid separation space and conducted through the reservoir fluid production assembly to the surface;
• and
• at least a portion of the reservoir fluid separation space defines a separation-facilitating passage portion of the intermediate wellbore passage, and the separation-facilitating passage portion is disposed within the wider intermediate section.

A reservoir fluid production system for producing reservoir fluid from a subterranean formation, comprising:

• a wellbore including an uphole portion and a downhole portion;
• a wellbore string that is lining the wellbore;
• wherein:
• the wellbore string includes a wider intermediate section and an uphole-disposed section that is disposed uphole relative to the wider intermediate section;
• the uphole-disposed section includes a narrower uphole-disposed section;
• and
• the wider intermediate section is wider relative to the narrower uphole-disposed section;
• a reservoir fluid production assembly disposed within wellbore string such that an intermediate wellbore passage is defined within a space between the wellbore string and the assembly and is extending longitudinally through the wellbore, wherein the assembly includes a flow diverter body including a reservoir fluid receiver, a reservoir fluid discharge communicator, and a gas-depleted reservoir fluid receiver;
• and
• a sealed interface;
• wherein:
• the sealed interface prevents, or substantially prevents, flow communication, via the intermediate wellbore passage, between the downhole wellbore space and the uphole wellbore space;
• the wellbore string, the assembly, and the sealed interface are co-operatively configured such that, while the flow diverter body is receiving reservoir fluid, via the reservoir fluid receiver, from the subterranean formation via the downhole wellbore space, and discharging the received reservoir fluid, via the reservoir fluid discharge communicator, into the uphole wellbore space, within a reservoir fluid separation space of the uphole wellbore space, a gas-depleted reservoir fluid is separated from the discharged reservoir fluid, in response to at least buoyancy forces, and is conducted to the gas-depleted reservoir fluid receiver;
• and
• at least a portion of the reservoir fluid separation space defines a separation-facilitating passage portion of the intermediate wellbore passage, and the separation-facilitating passage portion is disposed within the wider intermediate section.