Zonation testing method used for downhole intelligent well shutdown

Abstract

The invention provides a zonation testing method used for downhole intelligent well shutdown and belongs to the field of petrochemical engineering. According to the method, a control motor of a single-chip microcomputer is adopted to push and control opening or closing of a liquid outlet channel, then switchgears can automatically switch opening or closing horizons according to programs set on the ground, and zonation mining is carried out on an oil well, or the mode that pulse signals are sent from a well mouth at any time is adopted to control the switchgears; pressure measurement short sections uninterruptedly measure pressure and temperature data for storage; wireless readback meters are placed from the well mouth to the pressure measurement short sections, and read the data stored by the pressure measurement short sections in a wireless mode. By the utilization of the method, the purposes that the testing cycle is shortened and tested stratum pressure recovery data are more real and accurate are achieved, and testing cost is saved at the same time.

Description

Technical field [0001] The invention belongs to the field of petrochemical industry, and specifically relates to a layered test method for intelligent shut-in downhole. Background technique [0002] The patent with the patent number 200620089877 discloses a stratified oil production stratified test device for oil wells, which belongs to the class of oil well test devices. The development of multi-layer reservoirs has entered the middle and late stages, and the contribution rate of each layer is different due to interlayer interference. Traditional testing methods and measurement methods cannot accurately reflect the pressure parameters of a single layer. For this purpose, the device has passed The tubing short section, the upper joint, the lower joint and the instrument in the sheath are composed of the lower liquid inlet, sensor, signal memory and control panel power unit. The downhole instrument is connected to the wellhead computer through a cable, which can be used for multi-...

AI Technical Summary

Problems solved by technology

[0005] (2) A set of cable wellhead sealing device is required, which has a complex structure and high cost, especially for gas production wells, the cable wellhead sealing device is more complicated; if the wellhead sealing is not strict, the downhole continuous flow generated by the wellhead will have large errors in the interpretation results, and it is impossible to judge Whether the degree of pressure recovery is stable or not, the shut-in time is unpredictable;

[0007] In the well testing of low-permeability-ultra-low-permeability reservoirs, low fluid production reservoirs or gas production reservoirs, the formation pressure recovery is slow, resulting in a long test period. If the oil well produces gas, the gas in the wellbore is compressible, As a result, there is still continuous flow downhole after the well is shut down on the surface, and the measured pressure data is seriously affected by the wellbore storage effect, which is shown in the pressure double logarithmic curve. There are almost only early wellbore storage interval data, and then it is impossible to select a suitable template for interpretation , the entire test admission data is not complete and accurate

Images