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Cable stratum tester

A formation tester and cable technology, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc., can solve problems such as inability to adapt to various formation conditions, unfavorable disassembly, difficult maintenance, etc., to improve sampling accuracy and sampling efficiency, Ease of assembly and maintenance, and increased flexibility

Inactive Publication Date: 2012-08-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor safety of the existing formation tester, difficult maintenance, unfavorable disassembly, easy to be disturbed by the test environment, unable to adapt to various formation conditions, and accurately reflect the real appearance of oil and gas formations, its application is not ideal enough

Method used

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  • Cable stratum tester
  • Cable stratum tester
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 with figure 2 , a cable formation tester, including a probe and a pressure measurement module 3, a sampling cylinder module 6, a hydraulic power module 2, a pump extraction module 4, an electronic control module 1, a power supply module for supplying power to each module, and a common The pipeline 9, the probe and the pressure measurement module 3 include a retractable pusher 8, a sampling probe 7 and a pressure sensor. The sampling probe 7 and the pusher 8 are arranged opposite to each other, and can be supported on the inner wall of the wellbore 17, so that the cable formation The main body of the detector is fixed at the predetermined depth of the wellbore 17, and the formation fluid to be measured enters the sample pipeline directly through the sampling probe 7, and the pressure sensor measures the pressure of the fluid entering the sampling probe 7, and transmits the detection signal to the electronic control module 1 in real time. The power module 2...

Embodiment 2

[0045] The technical solution of this embodiment is basically the same as that of Embodiment 1, the difference is that:

[0046] In this example, see image 3 , the pump exhaust module 4 also includes another set of one-way valve group, which is also a bridge circuit composed of four one-way valves, specifically one-way valve E, one-way valve F, one-way valve G and one-way valve H is connected sequentially, wherein the one-way valve G and the one-way valve H are connected in series to form a primary injection fluid one-way valve 15, wherein the one-way valve F and the one-way valve E are connected in series and form a two-stage injection fluid one-way valve. The one-way valve 16, the one-way valve F and the one-way valve G are connected in reverse series, and the one-way valve H and the one-way valve E are also connected in reverse series, and the sampling probe 7 is simultaneously connected with the liquid outlet of the one-way valve F and The liquid outlet of the one-way va...

Embodiment 3

[0048] The technical solutions of this embodiment are basically the same as those of the foregoing embodiments, except that:

[0049] In this embodiment, the downhole fluid identification module includes a resistivity tester. The resistivity tester detects the resistivity of the formation fluid entering the sample pipeline. In the fluid pumping mode, when the detected resistivity of the original formation fluid meets After the sampling request, immediately enter the fluid sample sampling stage, and switch the liquid flow outlet of the two-position three-way solenoid valve 14 to inject the formation fluid in the sample pipeline into the PVT sampling cylinder 18 . By detecting the resistivity of the original formation fluid and referring to the system working standard value, the key step of switching the two-position three-way solenoid valve 14 from the fluid pumping mode stage is realized, and the formation fluid in the sample pipeline is injected into the PVT sampling cylinder ...

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Abstract

The invention discloses a cable stratum tester, which comprises a probe and pressure testing module, a sampling tube module, a hydraulic power module, a pump drainage module, an electronic control module, an underground fluid identification module and a public pipeline which penetrates through each module. A sampling tube of the sampling tube module comprises a fluid storage tube for accommodating own fluid and a pressure-volume-temperature (PVT) sampling tube for accommodating the fluid of a tested stratum. The underground fluid identification module can detect the quality characteristics of the stratum fluid entering a sample pipeline in real time. The pump discharge module has three operating modes, namely a pre-test mode, a fluid pump drainage mode and a fluid back-injection mode. Compared with the conventional cable stratum tester, the cable stratum tester has the advantages that: a high-quality original stratum fluid sample can be obtained; and the obtained stratum fluid sample is analyzed, and then various characteristic parameters of the stratum fluid can be accurately obtained. The cable stratum tester adopts a modular structural design, so that the using flexibility of the tester is improved, and the tester is convenient to assemble and maintain.

Description

technical field [0001] The invention relates to an oil well testing instrument, especially a cable formation testing device, which can obtain high-quality original formation fluid samples and accurately measure formation pressure. Background technique [0002] In the petroleum industry, obtaining accurate formation parameters in oil wells is of great significance for improving the production efficiency of oil reservoirs. In the process of petroleum exploration, in order to grasp the flow properties and physical parameters of oil and gas layers, it is necessary to carry out exact dynamic evaluation of oil and gas reservoirs. The current common practice is to test the formations, which involves a formation tester. Formation testers generally include drill pipe formation testers and cable formation testers. Although the drill pipe formation tester has mature technology, it is inconvenient to use, has a long construction period, complicated positioning operation, poor safety an...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B49/08
Inventor 周晓君乔春德刘吉成刘树林翟宇毅
Owner SHANGHAI UNIV
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