CN-121993170-A - Method and device for monitoring annular liquid level and pressure of pumping well of machine

CN121993170ACN 121993170 ACN121993170 ACN 121993170ACN-121993170-A

Abstract

The invention relates to the technical field of oil and gas resource development, in particular to a method and a device for monitoring the annular liquid level and pressure of a pumping well of a machine, wherein the method comprises the following steps of firstly, preparing a photoelectric composite cable with the length not less than the running depth of an oil pump according to the running depth of the oil pump; and step two, fixedly mounting the support barrel on the outer side of the oil well pump, and then fixedly mounting the electronic pressure gauge and the electronic thermometer in the support barrel at intervals. The invention has reasonable and compact structure, the photoelectric composite cable is fixed on the outer wall of the pumping pipe of the machine, the electronic pressure gauge and the electronic thermometer support cylinder are arranged on the outer side of the oil pump, and the liquid level position in the well bore is released by monitoring the distributed temperature and pressure data of the whole well bore. The device has the advantages that the device is suitable for mechanically pumping wells, realizes distributed temperature monitoring of the whole shaft, can realize correction of the temperature of the optical fiber by the electronic thermometer, improves the accuracy of measuring the temperature, can realize real-time reading of pressure by the electronic manometer, and solves the problem of influence of a foam section or a dead oil block and thick oil on the measurement accuracy of the liquid level.

Inventors

WANG QIAN
Ji Baoqiang
FENG MENG
DONG HONG
LI JUNFEI
ZHANG XINQI
ZHANG JIANGUO
XU HAIPENG
PENG SHAOYUN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (7)

1. The method for monitoring the annular liquid level and pressure of the pumping well is characterized by comprising the following steps of: Step one, preparing a photoelectric composite cable with the length not less than the depth of the oil pump according to the depth of the oil pump; Step two, fixedly mounting a support barrel on the outer side of an oil well pump, fixedly mounting an electronic pressure gauge and an electronic thermometer in the support barrel at intervals, and connecting the electronic pressure gauge with the electronic thermometer and the first end of a photoelectric composite cable; step three, connecting the second end of the photoelectric composite cable with acquisition equipment, detecting whether the optical fiber loss of the electronic pressure gauge, the electronic thermometer and the photoelectric composite cable is normal, if the signal is normal, performing the next step, and if the signal is abnormal, checking the electronic pressure gauge, the electronic thermometer and the photoelectric composite cable; Step four, firstly, disconnecting the second end of the photoelectric composite cable from the acquisition equipment, connecting an oil pump at the lower end of an oil pipe, putting the oil pump into a well, fixedly mounting the photoelectric composite cable at the outer side of the oil pipe while putting the oil pipe, and repeating the step three when the oil pump is put into the well for a certain depth; step five, repeating the step three when the oil pump is put into the target position in the well; step six, installing an oil pipe hanger at the upper end of the oil pipe, arranging a processing hole in the oil pipe hanger, penetrating the second end of the photoelectric composite cable out of the processing hole in the oil pipe hanger, setting the oil pipe hanger, penetrating the photoelectric composite cable out of one wing of the oil extraction four-way joint, connecting the photoelectric composite cable with ground acquisition equipment, and setting an oil extraction wellhead; Step seven, a sucker rod is put into the oil pipe, the lower end of the sucker rod is connected with the oil pump, and the upper end of the sucker rod is installed with the oil pump; step eight, when the oil pumping unit starts to work, real-time monitoring the temperature of the whole shaft, and the flow pressure and the flow temperature at the lower part of the oil pumping unit by using ground acquisition equipment; and step nine, analyzing the height of a foam section in the annular space of the shaft and the liquid level position in real time through the temperature and the flow pressure data of the whole shaft, and adjusting the rotating speed of the pumping unit in time.
2. The method for monitoring annular liquid level and pressure of a pumping well according to claim 1, wherein in the first step, the pumping well has a running depth of h, and the length of the photoelectric composite cable is L, wherein L is more than or equal to 1.1h.
3. The method for monitoring the annular liquid level and pressure of a mechanical pumping well according to claim 1 or 2, wherein in the fourth step, the photoelectric composite cable is fixedly arranged outside the oil pipe through a plurality of oil pipe clamps distributed at intervals while the oil pipe is lowered.
4. The method for monitoring the annular liquid level and pressure of a pumping well according to claim 1 or 2, wherein in the fourth step, the third step is repeated every 500 meters of the oil pump is put into the well.
5. The method of monitoring the fluid level and pressure in an annulus of a pumping well of claim 3 wherein in step four, the step three is repeated every 500 meters down the well of the pump.
6. The device for monitoring the liquid level and the pressure of the pumping well annulus is applied to the method for monitoring the liquid level and the pressure of the pumping well annulus according to any one of claims 1 to 5, and is characterized by comprising acquisition equipment, an photoelectric composite cable, an electronic pressure gauge, an electronic thermometer and a support barrel, wherein the electronic pressure gauge and the electronic thermometer are fixedly arranged in the support barrel at intervals, the first end of the photoelectric composite cable is respectively connected with the electronic pressure gauge and the electronic thermometer, and the second end of the photoelectric composite cable is connected with the acquisition equipment.
7. The apparatus of claim 6 wherein the collection device is an optical fiber DTS/DAS collector.

Description

Method and device for monitoring annular liquid level and pressure of pumping well of machine Technical Field The invention relates to the technical field of oil and gas resource development, in particular to a method and a device for monitoring annular liquid level and pressure of a pumping well of a machine. Background The echo instrument of the acoustic wave principle is generally adopted in the oilfield site to measure the working fluid level of the oil well, and the reflected acoustic wave curve obtained by the test is very complex due to the influence of various mechanical noise and electromagnetic noise in the air of the oil collar, so that the position of the reflected wave of the fluid level is not easy to identify. The article named as a dynamic liquid level signal denoising algorithm in an acoustic wave method oil well is disclosed, wherein the dynamic liquid level signal in the acoustic wave oil well is denoised by adopting a morphological filtering method, noise is greatly suppressed, an effective signal has higher fidelity in morphology, and the spectrum of the filtered signal is smoother by comparing the spectrums of the signals before and after filtering. However, in a production well with high gas-oil ratio or thick oil ratio, the result error of the obtained oil well working fluid level is large (tens of meters to hundreds of meters are different) due to the influence of a foam section or a dead oil block existing at the annular space of an oil pipe sleeve, and some thick oil wells can not be tested even, so that the correct evaluation of the oil field production well is influenced. The Chinese patent publication No. CN102031960A discloses a method and a device for testing the liquid level of an oil well, which are used for measuring a plurality of continuous temperature data by utilizing temperature measuring points on optical fibers in the oil well, locating the temperature inflection points according to the temperature inflection points in the temperature measuring points by utilizing an Optical Time Domain Reflectometry (OTDR) technology to obtain the liquid level data of the oil well, measuring the liquid level data of the oil well by utilizing the optical fiber temperature measuring technology, wherein the testing precision depends on the distance between the temperature measuring points, and when the distance between the temperature measuring points is smaller, the liquid level data measured by the method provided by the embodiment of the invention has higher precision. In the method and the device, when a pumping pipe column is arranged in a well, the optical fiber is difficult to drop, and the purpose of monitoring while pumping production can not be realized. Disclosure of Invention The invention provides a method and a device for monitoring the liquid level and the pressure of a pumping well annulus of a machine, which overcome the defects of the prior art, and can effectively solve the problem that the obtained test result has large error and the problem that the liquid level of a pumping thick oil well is difficult to test due to the influence of a foam section or a dead oil block at the annular position of an oil pipe sleeve of the existing monitoring machine pumping well. One of the technical schemes of the invention is realized by the following measures: the method for monitoring the annular liquid level and pressure of the pumping well comprises the following steps: Step one, preparing a photoelectric composite cable with the length not less than the depth of the oil pump according to the depth of the oil pump; Step two, fixedly mounting a support barrel on the outer side of an oil well pump, fixedly mounting an electronic pressure gauge and an electronic thermometer in the support barrel at intervals, and connecting the electronic pressure gauge with the electronic thermometer and the first end of a photoelectric composite cable; step three, connecting the second end of the photoelectric composite cable with acquisition equipment, detecting whether the optical fiber loss of the electronic pressure gauge, the electronic thermometer and the photoelectric composite cable is normal, if the signal is normal, performing the next step, and if the signal is abnormal, checking the electronic pressure gauge, the electronic thermometer and the photoelectric composite cable; Step four, firstly, disconnecting the second end of the photoelectric composite cable from the acquisition equipment, connecting an oil pump at the lower end of an oil pipe, putting the oil pump into a well, fixedly mounting the photoelectric composite cable at the outer side of the oil pipe while putting the oil pipe, and repeating the step three when the oil pump is put into the well for a certain depth; step five, repeating the step three when the oil pump is put into the target position in the well; step six, installing an oil pipe hanger at the upper end of the oil pipe, arranging a processing hole in the oi