Petroleum drilling oscillator

Abstract

The invention discloses a petroleum drilling oscillator. The petroleum drilling oscillator comprises a straight through outer power cylinder, a connector arranged at the bottom end of the outer power cylinder and a vibration device arranged at the top end of the outer power cylinder. A flow distribution device, a power device and a valve plate set are sequentially arranged in the outer power cylinder from top to bottom, a piston is arranged at the end, connected with the outer power cylinder, of the vibration device, the flow distribution device is connected with the power device through a pull rod, and the valve plate set is arranged between the connector and the power device. A turbine is adopted for the petroleum drilling oscillator to serve as a power source, a turbine component is a pure metal element, service life is greatly prolonged, and the petroleum drilling oscillator can be continuously used above 300 hours. Besides, the cost of the turbine component is low, so that overall manufacturing cost is reduced. All internal parts are installed in the straight through outer power cylinder, so that no eccentric motion occurs, and stability is better.

Description

technical field [0001] The invention relates to an oscillator for petroleum drilling. Background technique [0002] In the drilling process of complex structure wells such as horizontal wells, phenomena such as dragging and sticking are often encountered. At present, the commonly used method is to use an oscillator powered by a volumetric motor. The main components of the positive displacement motor include the stator and the rotor. Since the motor stator contains rubber components, the following problems often occur during use: [0003] 1. Rubber is a vulnerable part with a limited lifespan. Positive displacement motors often become weak after more than 100 hours of use, and then fall off and fall off. The service life of positive displacement motors mostly does not exceed 200 hours. [0004] 2. The outer layer of the stator is made of metal, and the inner layer is made of rubber. The downhole temperature increases with the depth of the well. Different materials have ...

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Problems solved by technology

[0004] 2. The outer layer of the stator is made of metal, and the inner layer is made of rubber. The downhole temperature increases with the depth of the well. Different materials have different degrees of thermal deformation, and the performance of the stator decreases at high temperatures.

[0005] 3. Ordinary rubber stators cannot be used in oil-based mud, and the price of volumetric motors used in oil-based mud is very high

[0006] 4. The volumetric motor is limited by the structure of the stator and rotor, and the size is generally large, usually more than 2.5 meters in length

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