RU2230902C2 - Method for controlling excavation and operation of wells - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes lowering of device into the well for measuring well parameters and angle between axis of device and axis of well. As well parameter fluid loss is measured, and values from loss sensor are divided by cosine of measured angle between axis of device and axis of the well.

EFFECT: higher precision of measurement of fluid loss of a well.

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Description

The invention relates to the oil and gas industry, in particular to methods for monitoring the development and operation of oil, gas and gas condensate wells and the operation of underground gas storage facilities.

A known method of monitoring the development and operation of wells and a diaphragm critical flow meter (DICT) for implementing this method [1].

A DICT device is mounted on the flare line of the fountain valve and by opening the gate on the fountain line, gas passes through the device and goes into the atmosphere. The DICT device measures the gas flow rate, its humidity and temperature.

DICT contains openings for communication with a manometer, purge valves, a thermowell for a thermometer and a diaphragm.

However, this method is applicable only in the absence of a gas pipeline and is not applicable for measurements in the well itself, and the DICT device measures the final parameters of the well and cannot take into account the productivity of individual sections of the well.

The closest in technical essence and the achieved result is a downhole tool for gravity exploration, which implements "a method of monitoring the development and operation of wells, including the descent of the device into the well to measure the parameters of the well and the angle between the axis of the device and the axis of the well" [2].

The disadvantage of this method is the inaccuracy of measuring fluid flow.

The aim of the present invention is to improve the accuracy of measuring the flow rate of the fluid of the well (its various sections) regardless of what angle the device is installed relative to the axis of the well.

The goal is achieved by the fact that in the known method of monitoring the development and operation of wells, including the descent of the device into the well to measure the parameters of the well and the angle between the axis of the device and the axis of the well, according to the invention, the fluid flow rate is measured as a well parameter, and the flow sensor readings are divided by the cosine of the measured angle between the axis of the device and the axis of the well.

The drawing shows a diagram of a device for implementing a method of monitoring the development and operation of wells and its location in the well.

The device comprises a housing 1, a gas (oil) flow sensor 2, a humidity sensor 3, a pressure sensor 4, a noise sensor 5, a temperature sensor 6, a hot-wire anemometer 7, gamma-ray logging 8, a coupler locator 9, an accelerometer 10, an electronic plateau 11, a wireline cable 12 or without self-powered and ground station 13.

The method is as follows.

The device on the wireline 12 or on the wire (in this case, the autonomous power supply and solid-state memory in the device) are lowered into the well and upon reaching the studied area, the flow sensor 2 is turned on or it turns on itself according to a given program on the surface and the accelerometer 10.

The data of the flow sensor 2 as a result of airflow and the angle of the axis of the device relative to the axis of the well due to the accelerometer 10 are transmitted to the ground station 13 or recorded in the solid state memory, where they process the data.

where Q ₁ - readings of the flow sensor, thousand m ³ / day;

α is the angle between the axis of the well and the axis of the device;

Q is the true gas flow rate, thousand m ³ / day.

Example. At the Kushchevsky field in the well. 150 were measured fluid flow rate of the proposed device according to the proposed method.

The device was lowered into the well to a depth of 1312 meters, on which the first measurement of gas flow was made and amounted to 3.4 thousand m ³ / day. The angle between the axis of the device and the axis of the well at this depth, measured by the accelerometer, was 16 °.

The second measurement was taken at a depth of 1306 meters and the following values were obtained: flow rate - 9.84 thousand m ³ / day, the angle between the axis of the device and the axis of the well - 12 °.

The third measurement was made at a depth of 1301 meters and the following values were obtained: gas flow rate - 13.2 thousand m ³ / day, the angle between the axis of the device and the axis of the well 14 °.

The true gas flow rate taking into account the angle between the axis of the device and the axis of the well in depth was:

At the wellhead at the metering unit, the flow rate was 13.58 thousand m ³ / day.

Therefore, the well operates in the range of 1312-1301 m.

Using the proposed technical solution will improve the accuracy of measuring the flow rate of the fluid in different sections of the well, regardless of the installation angle of the device relative to its axis.

Sources of information

1. A.I. Gritsenko et al. Guide to well exploration. - M .: Nauka, 1995, p. 487.

2. RF application No. 98119678 A, cl. G 01 7/00, 08.20.2000 - prototype.

Claims (1)

A method of monitoring the development and operation of wells, including the descent of the device into the well to measure well parameters and the angle between the axis of the device and the axis of the well, characterized in that the fluid flow rate is measured as a well parameter, and the flow sensor readings are divided by the cosine of the measured angle between the device axis and well axis.