Down-hole parameter monitoring device for fracturing

Abstract

The invention relates to a down-hole parameter monitoring device for fracturing in the technical field of petroleum and gas reservoir monitoring transformation. The down-hole parameter monitoring device for fracturing comprises a cylinder axially provided with a liquid inlet passage and a measurement passage which are in parallel, an upper gland, a monitoring device shell with perforated two ends and a lower gland are arranged in the measurement passage sequentially, the upper end of the upper gland is in tight fitting with the inner wall of the measurement passage in a threaded manner, a blind hole corresponding to the upper end of the monitoring device shell is formed in the lower end of the upper gland, a steplike liquid inlet hole is formed in the cylinder wall corresponding to the outer wall of the blind hole, an annular liquid inlet cover is connected into the liquid inlet hole, a plurality of axially penetrating first slits are formed in the annular liquid inlet cover, and the blind hole wall is provided with a plurality of radially penetrating second slits communicated with the first slits. Sealing rings matched with the inner wall of the measurement passage are arranged on the peripheries of two ends of the monitoring device shell, a monitoring device is arranged in the monitoring device shell and comprises an upper sensor, a circuit device and a lower sensor, and the lower gland is axially provided with third slits communicated with the lower end of the monitoring device shell.

Description

technical field [0001] The invention relates to oil and gas reservoir monitoring and modification technology, in particular to a downhole parameter monitoring device for fracturing. Background technique [0002] Fracturing is an important technical measure to enhance the recovery of low-permeability reservoirs. The relationship between downhole pressure and time during the fracturing process can reflect the extension law of underground fractures and formation characteristics, and the temperature at the bottom of the well directly affects the performance of fracturing fluid and proppant. Therefore, it is of great significance to accurately grasp the state parameters such as downhole pressure and temperature during the fracturing operation to guide the fracturing operation and evaluate the operation effect. [0003] The commonly used storage electronic pressure gauges to record downhole pressure mainly have the following problems: 1. The pressure gauge is often damaged due to...

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Problems solved by technology

[0003] The commonly used storage electronic pressure gauges to record downhole pressure mainly have the following problems: 1. The pressure gauge is often damaged due to severe vibration; 2. The pressure gauge can only monitor the parameters in the pipe string or annulus; 3. There is no The anti-erosion structure protects the battery, circuit board and probe of the pressure gauge; 4. The monitoring device hinders the lamination fracturing pitching operation

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