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Over pumping high and low temperature direct reading monitoring system

A temperature and pressure monitoring system technology, applied in measurement, wellbore/well components, earthwork drilling, etc., can solve the problems of data lag, different application scope, low temperature resistance index of downhole instruments, etc. The effect of high measurement accuracy and real-time measurement

Inactive Publication Date: 2006-07-05
中国石油天然气股份有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This test method has the problem of data lag, cannot guide production in real time, and is subject to certain restrictions in application; conventional direct reading tests generally use the instrument test through the oil jacket annulus or the test method of bundling the cable with the production string. It is mainly used for the test of thin oil wells, and cannot be used for direct reading monitoring of high-temperature heavy oil wells. The reason is that the temperature resistance index of downhole instruments (electronic pressure gauges) is low, and there is no suitable high-temperature electronic pressure gauge to choose from.
The maximum downhole temperature in the initial production stage of heavy oil and super heavy oil steam injection wells can reach about 260°C. The temperature resistance index of ordinary electronic pressure gauges at home and abroad is generally below 150°C. Very few foreign companies can provide electronic pressure gauges at 190°C. However, it still cannot meet the high temperature test requirements of 260°C
The high-temperature four-parameter series testing instruments developed by the Liaohe Oilfield Drilling and Production Institute have a maximum temperature resistance of 400°C, but the scope of application is different. They are generally used for short-term profile tests during the steam injection stage, and cannot be monitored for a long time due to the heat insulation index of the heat-insulating bottle; The air test and bundled cable test methods are also restricted by the blockage factors of crude oil in heavy oil wells and the cable temperature and wear resistance, which cannot meet the needs of high temperature direct reading monitoring

Method used

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  • Over pumping high and low temperature direct reading monitoring system
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  • Over pumping high and low temperature direct reading monitoring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention as figure 1 , figure 2 The conception of the direct-reading monitoring system for the temperature and pressure parameters of the pump shown and its monitoring and control system: the temperature and pressure signals sensed by the downhole temperature and pressure sensors are converted into digital signals through the downhole data acquisition and transmission system, and after encoding, they are connected through the downhole cable The test core of the tester, cable connector and heating test dual-function cable is uploaded to the ground control system for decoding to realize test data display, IC card data storage or direct reading by the computer. In addition, the ground control system also passes the cable test. The wire core loads power for the downhole testing system. The downhole temperature and pressure sensor 8 and the data acquisition and transmission system 7 are connected to the lower end of the downhole cable connector 6, the upper en...

Embodiment 2

[0023] The present invention is also characterized in that the heating test dual-function cable: the test signal collected by the data acquisition and transmission system 7 is uploaded to the ground data display storage control system 1 through the heating test dual-function cable 3, and the test signal is tested while performing electric heating. The transmission adopts the digital carrier method, and realizes power supply and signal transmission on one wire core. The heating test dual function cable 3 is designed as a coaxial round cable, such as image 3 , its structure from inside to outside is as follows: reinforced steel wire inner core and copper signal line layer 3.1 is made of Φ0.8×12 reinforced steel wire, Φ0.8×73.53mmTR copper signal line, outer diameter Φ4.0; fluorine plastic insulation Layer 3.2 is made of fluorine plastic with a thickness of 0.8mm and a temperature resistance of 260°C, with an outer diameter of Φ5.6; the heating conductor layer 3.3 is made of Φ2×...

Embodiment 3

[0025]The present invention is also characterized by the automatic docking of downhole cables, including two parts, the downhole cable connector 5 and the downhole cable connector 6, which are the key to realize simultaneous heating and testing of oil wells. The lower end of the downhole cable connector 6 is connected to the data acquisition and transmission system 7 and the temperature and pressure sensor 8, and its upper end is connected to the hollow sucker rod 4, and is connected to the lower end of the hollow tail rod of the circulation pump during oil well operation, and is lowered along with the hollow sucker rod 4. The main body 5.3 of the cable connector 5 is a cone, and the main body 6.3 of the downhole cable connector 6 is an inner tapered hole. Under the action of gravity of the test dual-function cable 3, the cable connector 5 and the downhole cable connector 6 are plugged together, and the heating conductor layer 3.3 in the dual-function cable 3 is heated and test...

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Abstract

A high-and low-temp direct reading type monitor system for the well of thick or ultra-thick petroleum heated when it is pumped features use of such techniques as bifunctional electric cable for both heating and measuring, automatic underground connection of cables, temp and pressure semsors, underground data acquuisition and transmission without thermal insulation, data display, storage and control on ground, and indoor analysis. Its advantages are high resistance to high temp. precision and stability, and saving energy.

Description

Technical field: [0001] The present invention relates to a "pump temperature and pressure parameter direct-reading monitoring system" used for the monitoring of oil production wells heated by pumping in the oil field, in particular to a real-time direct-reading monitoring system for temperature and pressure parameters at the bottom of the well during the production stage after steam injection well blowout monitoring system. Background technique: [0002] Heavy oil and ultra-heavy oil are generally exploited by steam huff and puff technology. Monitoring the downhole temperature and pressure parameters to grasp the downhole reservoir dynamics is very necessary to guide the production of oil wells. At present, the bottomhole temperature and pressure data of heavy oil and ultra-heavy oil wells are generally collected by storage-type high-temperature long-term electronic pressure gauges. The pipe string is run in, and the temperature and pressure data of an oil recovery producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06E21B47/07
Inventor 赵业卫崔士斌邓中先徐英莉孙向东祝亚东张跃华孙长库赵伟吴冠霖李春艳
Owner 中国石油天然气股份有限责任公司