Downhole sucker rod pump

A downhole sucker rod pump comprising:

• a plunger;
• a housing that defines a passage-defining surface, wherein the passage-defining surface includes an inner-surface configuration and a recess-defining surface, wherein the recess-defining surface is recessed from the inner surface configuration and defines a recess;
• and
• a housing passage defined by the passage-defining surface;
• wherein:
• the plunger and the housing are co-operatively configured such that the plunger is operable for reciprocating movement through the housing passage, with effect that:
• the plunger travels through the housing passage and traverses a plunger-traversable section of the passage-defining surface of the housing, wherein the travel, of the plunger, is characterized by an upper extent of travel of the plunger, at which the plunger becomes emplaced in an uppermost position, and is also characterized by a lower extent of travel of the plunger, at which the plunger becomes emplaced in a lowermost position;
• a clearance is defined between the plunger and the inner surface configuration of the housing, such that flow communication is established across the plunger via the clearance;
• and
• at least a portion of the recess extends from the plunger-traversable section to below the lowermost position of the plunger;
• and
• the plunger and the housing are further co-operatively configured such that while the downhole sucker rod is emplaced within a wellbore, in flow communication with a reservoir within which is disposed a solids-comprising reservoir fluid material, and reciprocating movement, of the plunger, is being motivated:
• the solids-comprising reservoir fluid material is displaced in an uphole direction, to an uphole space of the housing passage that is disposed uphole relative to the uppermost position of the plunger, a solid material separates from the solids-comprising reservoir fluid in response to gravity separation and the separated solid material is conducted via the housing passage to the clearance, and, after being received within the clearance, the separated solid material is conducted via the clearance to the recess, and, after being received within the recess, the separated solid material is conducted via the recess to a downhole space, of the housing passage, that is disposed downhole relative to the lowermost position of the plunger.