| 主权项 |
1. A simultaneous production and maintenance system for a pumped production well at a reservoir, the system comprising:
a) a hydraulic drive head producing and transmitting vertical reciprocal motion, the hydraulic drive head comprising:
(i) a hydraulic connection receiving hydraulic fluid,(ii) hydraulic pistons driven by the hydraulic fluid,(iii) a set of pulleys including upper and lower pulleys, the upper pulleys each coupled to and rotated by one of the hydraulic pistons, the set of pulleys coupled to a guide car, the upper pulleys having parallel axes of rotation, and the lower pulleys having axes of rotation at right angles to the upper pulleys,(iv) steel cables passing over each of the pulleys of the set of pulleys, such that reciprocation of the hydraulic pistons drives the set of pulleys causing vertical reciprocal motion of the hydraulic drive head, and(v) a pump connection; b) a surface assembly, mechanically coupled to the hydraulic drive head, the surface assembly holding and securing a first flexible tubing for circulation of fluids in the well, the surface assembly comprising a sub-base comprising a stuffing box system for controlling an output of production fluids out of the well, a preventer with O-ring seals, and a wedge-preventer, a discharge pipe, and a connection and splicing mean having a flange joining the surface assembly with production tubing; c) the first flexible tubing secured by the wedge preventer and extending from above the well to within the well, the first flexible tubing coupled to the hydraulic drive head and subject to the reciprocal motion transmitted from the hydraulic drive head, the first flexible tubing coupled to an end of a pumping second flexible tubing by a swivel connection, the other end of the second flexible tubing end is coupled to a fixed metal tube by means of a second swivel connection coupled to a pump connection of the hydraulic drive head such that during operation, cleaning chemical fluid is pumped into the well via the pump connection and through the second flexible tubing and then through to the first flexible tubing; d) a production tubing concentric with and outside the first flexible tubing thereby forming an annular space therebetween; and e) a pump assembly coupled to the first flexible tubing, the pump assembly comprising, sequentially from the bottom up, a stationary subsurface pump, a flow conduit having production holes, a blind plug, a cleaning tool having a plurality of flow ports, and a check valve, the cleaning tool coupled to the stationary subsurface pump by the blind plug, whereby during use in maintenance, the blind plug blocks flow of produced fluids from travelling up the cleaning tool and diverts the produced fluids through the production holes of the flow conduit into the annular space, and the cleaning chemicals fluid travelling down inside the first flexible tubing are blocked by the check valve, and thereby flow out of the plurality of flow ports into the annular space to commingle in the annular space with the produced fluids; wherein, as assembled, the hydraulic drive head, and the surface assembly are in vertical line with the first flexible tubing, the production tubing, and the pump assembly; wherein, during operation, when a hydraulic fluid is charged through the hydraulic connection to the hydraulic drive head, the hydraulic fluid passes to the hydraulic pistons causing the hydraulic pistons to extend longitudinally upwards to lift the guide car, and when the hydraulic fluid is drained, the hydraulic pistons extend longitudinally downward in the hydraulic drive head to lower the guide car; the motion of the guide car thereby causing an ascending and descending reciprocal motion of the first flexible tubing actuating the stationary subsurface pump. |
