A self-starting oil drain valve

Abstract

The invention discloses a self-starting oil drain valve, which includes a joint arranged in a casing, an inner pipe is sleeved inside the joint, a cylinder barrel is sleeved outside the connection between the joint and the inner pipe, and the end of the inner pipe far away from the cylinder barrel is sleeved in turn. It is connected with an adjustment ring, a spacer and an oil drain cylinder. A starting cock is set between the cylinder and the joint. A liquid chamber and an air chamber are sequentially opened between the inner tube and the cylinder. The liquid chamber communicates with the inner tube, and the inner tube is also sleeved There is a piston and an expansion ring, the piston and the expansion ring are located between the cylinder and the inner tube, the inner wall of the cylinder near the end of the piston is provided with a card slot, the expansion ring is sleeved on the piston, and the expansion ring and the card slot are detachably connected. The adjustment ring is sleeved on the outside of the cylinder, the oil drain cylinder is sleeved on the outside of the spacer, and the outside of the spacer is sleeved with a rubber tube. There is a hole A on the adjustment ring, and holes B and C are opened on the spacer in turn. An overflow groove is opened between the sleeve and the inner pipe, and a hole D is opened on the drain cylinder. The invention has simple structure, reliable performance and low cost.

Description

technical field [0001] The invention relates to the field of oil drilling industry, in particular to a self-starting oil drain valve. Background technique [0002] In the field of oil extraction technology, the design of the oil drainer is one of the most important core technologies. At present, the conventional oil drainer is used in the production process, and the sucker rod is easy to touch the oil drain switch of the oil drainer, and accidental leakage occurs, which is reliable. Poor performance, when the wax, scale, sand stuck in the oil pipe is serious, or when the pump is stuck or the sucker rod breaks, the conventional oil drainer cannot be opened to drain the oil, and the adaptability is poor; when draining the oil, the sucker rod needs to be lifted and released repeatedly , or the tubing string needs to be rotated continuously, and the operation is complex; there are too many holes and grooves in the conventional oil drainer, and the sealing ring is easily damaged ...

AI Technical Summary

Problems solved by technology

[0002] In the field of oil extraction technology, the design of the oil drainer is one of the most important core technologies. At present, the conventional oil drainer is used in the production process, and the sucker rod is easy to touch the oil drain switch of the oil drainer, and accidental leakage occurs, which is reliable. Poor performance, when the wax, scale, sand stuck in the oil pipe is serious, or when the pump is stuck or the sucker rod breaks, the conventional oil drainer cannot be opened to drain the oil, and the adaptability is poor; when draining the oil, the sucker rod needs to be lifted and released repeatedly , or the tubing string needs to be rotated continuously, and the operation is complex; there are too many holes and grooves in the conventional oil drainer, and the sealing ring is easily damaged when it passes through the above holes and grooves; and the large particles of mud and sand in the oil are easy to pass through the holes When entering the relevant chamber, the sealing ring will be greatly worn, which will reduce the life of the sealing ring, resulting in poor sealing performance of the oil drainer and easy leakage; It is stuffed and the locking spring is difficult to lock, which makes the locking performance of the oil drainer poor; the overflow channel of the conventional oil drainer is set on the inside or outside of the rubber tube, which reduces the anchoring performance of the rubber tube on the one hand, and on the other hand, when the rubber tube is affected When compressed, the flow channel also shrinks and becomes smaller, reducing the flow of liquid; the drain holes and sealing grooves of conventional oil drains are respectively set on different parts, and the drain holes are mostly small round holes, which are not only easy to scratch Breaking the sealing ring will reduce the sealing performance of the oil drainer, and the oil drain hole will be easily blocked by dead oil and wax, which will affect the oil drainage volume; the conventional oil drainer needs to be pressed by a pressurized truck, or the number of string tail pipes should be increased to support the bottom of the well. It may be necessary to add Y211 packer anchoring coordination, long operation time and high operation cost

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