| CPC G01F 1/44 (2013.01) [E21B 34/025 (2020.05); E21B 47/10 (2013.01); G01F 15/005 (2013.01)] | 13 Claims |

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1. An insertable flow meter assembly, comprising:
a flow measuring device configured to be inserted into a flow passage of a receiving structure, wherein the flow measuring device is configured to enable determination of a flow rate of fluid through the flow passage, and an outer cross-section of at least a portion of the flow measuring device is configured to be substantially the same as an inner cross-section of the flow passage; and
an end cap configured to engage an exterior surface of the receiving structure and to couple to the receiving structure at an end of the flow passage, wherein the end cap is configured to substantially seal the end of the flow passage, and the end cap is configured to block movement of the flow measuring device out of the end of the flow passage;
wherein the flow measuring device comprises a venturi; and
wherein the flow measuring device is formed as a single continuous structure made from a single piece of material and does not include a separate sleeve positioned between the venturi and the flow passage.
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