| 摘要 |
FIELD: oil producing industry, particularly, device regulating operating conditions and investigations of oil and gas wells by throttling flow of working medium by varying passage area. SUBSTANCE: throttle includes body, floating piston, rod with seals. They separate casing-borehole annulus from tubing-casing annulus above throttle. Installed inside body is bushing of definite length. Throttle also has air chamber. Body has slots whose length equals length of stroke of floating piston. Bushing is hydraulically equalized through slots and rigidly connected through rod with floating piston and changes passage area of slots to 30 sq.cm. Air chamber is filled with air. With full compression and full opening of slots, pressure in air chamber rises up to formation pressure. EFFECT: higher reliability in protection of formation from excessive withdrawal of products from it and increased service life of well due to automatic selection of optimal depression of formation. 1 dwg |
