METHOD AND DEVICE FOR RECOVERY OF HORIZONTAL WELL PRODUCTION AND EFFECT ON FORMATION Russian patent published in 2018 - IPC E21B43/16 E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: method for recovery of horizontal well production and effect on formation includes the following steps. A complex device is first run into the horizontal wellbore consisting of a ground multifunctional control panel and control, and downhole acoustic radiator connected by a hose-cable of radial-type, a unit of geophysical instruments and an electro-hydraulic radiator with plasma discharger connected therebetween by geophysical adapters. Before completion of horizontal section, the instruments are tied by the geophysical unit. After that, the readings of downhole parameters are taken before treatment, the formation pores and the filters of the horizontal well section are cleaned acoustically. Plasma treatment of the cleaned section is carried out in order to involve dead formation zones by the source. Then, actual parameters are taken by the geophysical unit and the processes are repeated until the horizontal section of the well is covered completely. Electric hydraulic emitter is configured as a modular design and comprises a stabilisation unit, a capacitor bank, and a plasma discharger. The stabilisation unit contains a step-up-decoupling transformer which also supplies power to discharge gap plasma ignition unit. Plasma discharger consists of a body with inner cavity, whose upper part is connected to the connecting bushing, and the lower part is connected to the supporting bushing. In the body cavity there is a cylinder fixed on the middle part of the supporting bushing. The cylinder contains a piston with a rod, and a spring. Wire feed mechanism is secured in the upper part of the piston. The wire feed mechanism is in the form of a lever with a supporting platform and a link with spring. Directed incisions are made on the supporting platform and on the link from the side facing the wire. Four rods are attached to the cylinder that serve as a base for a coil fastening unit. The holes are made in the supporting bushing for arrangement and attachment of negative and positive electrodes. The electrodes are insulated with open sections providing plasma discharge. The negative electrode has an axial hole for passing the wire. A guide cone is fixed on the supporting bushing by means of posts.

EFFECT: improved cleaning of bottomhole formation zone, increased well production rate.

12 cl, 4 dwg