CN102518423B - High-temperature thermal production well downhole testing method - Google Patents

Abstract

The invention relates to a testing instrument, in particular to a high-temperature thermal production well downhole testing method. The testing instrument at least comprises a sensor and a testing circuit. The high-temperature thermal production well downhole testing method is characterized in that a testing layer and a dead water region are arranged in the downhole, the dead water region is located at the bottom of a well, the testing layer is located in the well, the temperature of the dead water region is lower than 150 DEG C, the temperature of the testing layer is higher than 200 DEG C, the senor is electrically connected with the testing circuit through a lead, the lead can be a cable or high-temperature cable and is 1m in length, the testing circuit is mounted in an outer seal tube and provided with a storage unit, the storage unit is connected with the testing circuit, and the testing circuit and the cable are provided with sealing devices. The high-temperature thermal production well downhole testing method is applicable to long-term operation in high-temperature areas.

Description

A downhole testing method for high temperature thermal recovery wells

technical field

The invention relates to a testing instrument, in particular to an underground testing method of a high-temperature thermal recovery well.

Background technique

Thermal recovery is an oil recovery method in which heavy oil is heated by injecting high-temperature steam downhole, burning and other measures for oil recovery. During the entire thermal recovery stage, the temperature of the production layer is generally above 200°C. In order to be scientifically and effectively recoverable, parameters such as temperature, pressure, flow rate and dryness of the formation need to be obtained. At present, the thermal recovery instruments in the market all use thermos bottles, and the longest logging time at an ambient temperature of 350°C is 96 hours, but the parameter measurement time required by actual thermal recovery wells is much longer than 96 hours, and the ambient temperature of the measurement layer is also very high. If the temperature is higher than 300°C, there is currently no suitable test instrument on the market that can work for a long time in a high-temperature thermal recovery well to complete the measurement of downhole parameters.

Contents of the invention

The purpose of the present invention is to provide a high-temperature thermal recovery well downhole testing method that can work in a high-temperature zone for a long time.

The object of the present invention is achieved like this, a kind of high-temperature thermal recovery well downhole testing method, it comprises at least: sensor, measuring circuit, it is characterized in that: downhole has measurement horizon and dead water zone, and dead water zone is at the bottom of downhole, measuring layer Located in the well, the temperature of the dead water area is lower than 150°C, the temperature of the measured layer is greater than 200°C, and the sensor and the measuring circuit are electrically connected through lead wires.

The lead wire is a cable or a high temperature cable.

The length of the lead wire is greater than 1 meter.

The measuring circuit is installed in the sealed outer tube, and the measuring circuit and the cable are provided with a sealing device.

The measuring circuit has a storage unit, and the storage unit is connected with the measuring circuit.

The advantages of the present invention are: since the temperature of the dead water area is lower than 150°C, the temperature of the measuring layer is greater than 200°C and lower than 350°C, the sensor can conveniently work in the high temperature area above 200°C, and the measuring circuit works at 150°C. In the temperature zone below ℃, the two are connected by cables, which solves the problem of high temperature (greater than 200 ℃) and no high-temperature thermal recovery well instruments.

Description of drawings

The present invention will be further described below in conjunction with embodiment:

Fig. 1 is the circuit connection diagram of the embodiment.

In the figure, 1. Measurement horizon; 2. Dead water area; 3. Sensor; 4. Measuring circuit; 5. Cable; 6. Downhole.

Detailed ways

As shown in Figure 1, the downhole testing method of high temperature thermal recovery wells at least includes: sensor 3, measurement circuit 4, downhole 6 has measurement horizon 1 and dead water zone 2, dead water zone 2 is at the bottom of downhole 6, and measurement horizon 1 In the well, the temperature in the dead water area 2 is lower than 150°C, and the temperature in the measurement layer 1 is greater than 200°C. The sensor 3 and the measurement circuit 4 are electrically connected through a cable or a high-temperature cable 5 . The measurement circuit 4 of the instrument is lowered to the stagnant water area 2 under the measurement layer through the oil pipe according to different mines, the sensor 3 is placed in the measurement layer 1, and the sensor 1 and the measurement circuit are electrically connected through the cable 5. The length of the cable 5 is greater than 1 meter. Since the temperature of the dead water area is lower than 150°C and the temperature of the measurement layer is greater than 200°C, the sensor can easily work in the high temperature area above 200°C, and the measuring circuit works in the temperature area below 150°C. The connection is a good solution to the problem of high temperature (greater than 200°C) and no high-temperature thermal recovery tools.

In order to prevent the measuring circuit 4 from damaging the circuit in the dead water area 2, the measuring circuit 4 is installed in a sealed outer tube, and the measuring circuit 4 and the cable 5 have a sealing device.

The measurement circuit 4 has a storage unit, and the storage unit is connected to the measurement circuit 4 . In this way, after the measurement is completed, after the measurement circuit 4 is retrieved, the instrument is connected to the ground, and the data can be read for analysis.

It is worth noting that the components and structures not described in detail in this embodiment are well-known components and common structures or common means in this industry, and will not be described here one by one.

Claims (3)

1. A kind of downhole testing method of high-temperature thermal recovery well, it comprises at least: sensor, measuring circuit, it is characterized in that: there are measuring horizon and dead water zone downhole, and dead water zone is at the bottom of downhole, and measuring horizon is in the well, and the dead water zone The temperature is lower than 150°C, and the temperature of the measurement layer is greater than 200°C. The measurement circuit of the instrument is lowered to the dead water area under the measurement layer through the oil pipe according to different mines, and the sensor is placed in the measurement layer. The sensor and the measurement circuit pass through the cable. Electrical connection; the length of the cable is greater than 1 meter. 2. The downhole testing method of a high temperature thermal recovery well according to claim 1, characterized in that: the measuring circuit is installed in a sealed outer tube, and the measuring circuit and the cable are provided with a sealing device. 3. The downhole testing method of a high-temperature thermal recovery well according to claim 1, characterized in that: the measuring circuit has a storage unit, and the storage unit is connected to the measuring circuit.