Layer testing technology and apparatus for loose sand gas-field gas-production well oil-casing

Abstract

This invention relates to a dynamic stratified test technology to oil pipes and casting pipes of loose sands tone gas oil field and its devices characterizig in fixing a direct-reading pressure meter probeoutside of an oil pipe and dropping it to the middle of the gas layer along with the oil pipe in the casing pipe, a cable is connected with the pressure meter probe and the direct-reading device at the portal and test and the portal. This technology can test the flow pressure, static pressure of the casing pipe production layer, and its pressure recovery and dropping at any time.

Description

Technical field: [0001] The invention relates to a layered testing process and equipment for oil and casing of gas production wells in unconsolidated sandstone gas fields, which can improve single well production and obtain and analyze production dynamic data. Background technique: [0002] The current technical methods to solve the problem are as follows: [0003] (1) Use a high-precision electronic pressure gauge at the wellhead to test, and then calculate the pressure to the bottom of the well. This method is only suitable for pure gas wells, and at the same time, the error is large, and further research and comparison are necessary. [0004] (2) Install the storage-type electronic pressure gauge on the packer, run it into the well during operation, conduct uninterrupted testing, or design a program to switch the well at regular intervals, and take it out in the next operation. The disadvantage is that the storage of pressure gauges is limited, and the quality of the pre...

AI Technical Summary

Problems solved by technology

The difficulty is how to seal the cable head at the wellhead. Compared with the storage type, more than 1,000 meters of cable must be left in the well each time the instrument is run in. The operation procedure is more complicated. It is more suitable if the pipe string can not be moved for three years.

[0006] (4) Instruments that can transmit wireless signals are placed underground, but such instruments are generally more expensive, according to Schlumberger, generally around 3 million yuan, and are affected by battery capacity

However, this method affects the output. At the same time, different nozzles are used for each layer to produce, and it is impossible to obtain the data of each layer without interlayer interference.

To obtain the flow pressure and flow temperature data of each layer under normal conditions, and the unstable well test data require a long stabilization time, and some data cannot be recorded, and the flow rate of each layer cannot be one-to-one corresponding to the pressure data

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