Abstract: A tubing drain with a reusable body and a replaceable sacrificial burst element, the tubing drain comprising an annular body with a window and first and second connector ends, each connector end connectable to an end of tubing sections in a tubing string. The tubing drain also has an inner body insertable into the annular body, the inner body providing the replaceable sacrificial burst element. A burst profile in the inner body aligns with the window in the annular body and provides a burst element which may be configured to burst when a target pressure differential occurs across the burst profile, thereby draining fluids from the tubing string into the casing string.

Abstract: A tubing drain with a reusable body and a replaceable sacrificial burst element, the tubing drain comprising an annular body with a window and first and second connector ends, each connector end connectable to an end of tubing sections in a tubing string. The tubing drain also has an inner body insertable into the annular body, the inner body providing the replaceable sacrificial burst element. A burst profile in the inner body aligns with the window in the annular body and provides a burst element which may be configured to burst when a target pressure differential occurs across the burst profile, thereby draining fluids from the tubing string into the casing string.

Abstract: A driveshaft assembly for a downhole motor comprises a housing and a driveshaft rotatably disposed within the housing. The driveshaft has a central axis and a first end. Further, the driveshaft assembly comprises a driveshaft adapter having a first end coupled to the first end of the driveshaft with a universal joint. The first end of the driveshaft adapter includes a counterbore. The first end of the driveshaft and the universal joint are disposed in the counterbore. Still further, the driveshaft assembly comprises an end cap disposed about the driveshaft and coaxially coupled to the adapter. Moreover, the driveshaft assembly comprises a seal boot disposed about the driveshaft and adapted to restrict fluid flow through a annular gap positioned between the driveshaft and the end cap. The driveshaft assembly also comprises a locking assembly adapted to restrict the end cap from moving axially relative to the adapter.

Abstract: A driveshaft assembly for a downhole motor comprises a housing and a driveshaft rotatably disposed within the housing. The driveshaft has a central axis and a first end. Further, the driveshaft assembly comprises a driveshaft adapter having a first end coupled to the first end of the driveshaft with a universal joint. The first end of the driveshaft adapter includes a counterbore. The first end of the driveshaft and the universal joint are disposed in the counterbore. Still further, the driveshaft assembly comprises an end cap disposed about the driveshaft and coaxially coupled to the adapter. Moreover, the driveshaft assembly comprises a seal boot disposed about the driveshaft and adapted to restrict fluid flow through a annular gap positioned between the driveshaft and the end cap. The driveshaft assembly also comprises a locking assembly adapted to restrict the end cap from moving axially relative to the adapter.