Hydraulic sidewall contact device of cased well wireline logging tractor

Abstract

The invention relates to a hydraulic sidewall contact device of a cased well wireline logging tractor. The hydraulic sidewall contact device of the cased well wireline logging tractor is provided witha low-pressure oil bin and a high-pressure oil bin. A force-bearing pin screw connecting a low-pressure oil bin shell and a high-pressure oil bin shell is located in a kidney-shaped groove and can axially move in the kidney-shaped groove. A plunger pump is fixed to the low-pressure oil bin shell. The output end of the plunger pump is inserted into the high-pressure oil bin. An electromagnetic valve is fixed into the high-pressure oil bin shell. The two ends of the electromagnetic valve are in contact with hydraulic oil in the low-pressure oil bin and the high-pressure oil bin correspondingly.One end of a push rod extends into the high-pressure oil bin, and one end of the push rod is connected with stay bars. The stay bars are connected with two traction arms correspondingly. The tractionarms are connected with a gear assembly. The gear assembly is fixed to the traction arms. When the traction arms need to be unfolded, the electromagnetic valve is switched off, the plunger pump pressurizes the low-pressure oil and conveys the pressurized oil into the high-pressure oil bin, the push rod is driven to unfold the traction arms, and positive pressure is exerted on a casing pipe. Whenthe electromagnetic valve is switched on, the two oil bins communicate, the oil pressure of the high-pressure oil bin is lowered, the push rod is retracted, and then the traction arms are retracted. The hydraulic sidewall contact device of the cased well wireline logging tractor is a sealed device, can generate constant positive pressure, is not influenced by the external environment and is stableand reliable in work.

Description

technical field [0001] The invention relates to a casing tractor, in particular to a hydraulic pushing device for a casing well cable logging tractor. Background technique [0002] Puller transmission is an important transportation tool for horizontal well logging, in which the pusher device of the tractor is the main part that opens the driving arm of the tractor to contact the casing wall and exerts positive pressure on the casing to generate traction force . [0003] The previous tractor pushing devices all adopt mechanical structure, which opens the traction arm by means of motor compression spring. After long-term use, the spring elasticity will decrease, which will make the elastic force smaller. After the traction arm is opened, the positive pressure on the casing will change. Therefore, the conveying effect of the tractor is affected; and the mechanical parts of the tractor pushing device are exposed, and the sundries in the wellbore are easy to jam the pushing devi...

AI Technical Summary

Problems solved by technology

[0003] The previous tractor pushing devices all adopt mechanical structure, which opens the traction arm by means of motor compression spring. After long-term use, the spring elasticity will decrease, which will make the elastic force smaller. After the traction arm is opened, the positive pressure on the casing will change. Therefore, the conveying effect of the tractor is affected; and the mechanical parts of the tractor pushing device are exposed, and the sundries in the wellbore are easy to jam the pushing device mechanism, causing the tractor pushing device to fail, resulting in a low logging success rate

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