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Performance tester for gel valve in the course of underbalance well drilling and well completion and application thereof

An underbalanced drilling and tester technology, applied in the field of oil and gas field drilling, can solve problems such as failure to perform accurate evaluations

Inactive Publication Date: 2011-01-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of underbalanced drilling, some performance parameters of the jelly valve have not yet been accurately evaluated: 1) in the downhole state, the actual state of the jelly; 2) under the downhole temperature and pressure, the jelly 3) Accurate description of the gelling strength of the jelly at different times and temperatures (the overall air tightness and compressive strength of the jelly); 4) Evaluation of the breaking effect of the gel breaker under the downhole temperature and pressure

Method used

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  • Performance tester for gel valve in the course of underbalance well drilling and well completion and application thereof
  • Performance tester for gel valve in the course of underbalance well drilling and well completion and application thereof
  • Performance tester for gel valve in the course of underbalance well drilling and well completion and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example evaluates the jelly strength of the jelly valve at 90°C.

[0030] (1) Close the pressure reducing valve 2, the flow meter 3, the lower pressure valve 6, install the bottom cover 15, put the temperature control probe 12 into the temperature control rubber tube 8, and preheat the instrument to 90°C;

[0031] (2) Put the gasket into the temperature-controlled rubber tube body 8 and spread it flat on the pressure hole at the lower end, then pour the prepared solution to be glued, install the top cover 13, and heat for 5 hours;

[0032] (3) Before testing, turn off the temperature controller 5, pull out the temperature control probe 12, and remove the top cover 13;

[0033] (4) Open the lower pressure valve 6 (note that the flowmeter is closed at this time, because the pressure of the large pipe is large, the liquid is easy to flow back, so the lower pressure valve cannot be opened too large), then open the pressure reducing valve 2, when the temperature is controlled W...

Embodiment 2

[0037] This example evaluates the jelly strength of the jelly valve at 120°C.

[0038] (1) Close the pressure reducing valve 2, the flow meter 3, the lower pressure valve 6, install the bottom cover 15, put the temperature control probe 12 into the temperature control rubber tube body 8, and preheat the instrument to 120°C;

[0039] (2) Put the gasket into the temperature-controlled rubber tube body 8, make it flat on the pressure hole at the lower end, pour the configured solution to be glued into the temperature-controlled rubber tube body 8, install the top cover 13, in Heat at 120℃ for 5h;

[0040] (3) Before testing, turn off the temperature control instrument 5, pull out the temperature control probe 12; remove the top cover 13;

[0041] (4) Open the lower pressure valve 6 (note that the flowmeter is closed at this time, because the pressure of the large pipe is large, the liquid is easy to flow back, so the lower pressure valve cannot be opened too large), then open the pressur...

Embodiment 3

[0045] This example analyzes the air tightness strength of the jelly valve.

[0046] (1) Close the pressure reducing valve 2, the flow meter 3, the lower pressure valve 6, and install the bottom cover 15, put the temperature control probe 12 into the temperature control rubber tube body 8, and preheat the instrument to 80°C;

[0047] (2) Pour in the prepared solution to be glued, install the top cover 13, and heat for 5 hours;

[0048] (3) Before testing, turn off the temperature control instrument 5, pull out the temperature control probe 12; remove the top cover 13;

[0049] (4) Open the lower pressure valve 6 (note that the flowmeter is closed at this time, because the pressure of the large pipe is large, the liquid is easy to flow back, so the lower pressure valve cannot be opened too large), then open the pressure reducing valve 2, when the temperature is controlled When the size of the rubber tube body (8) is 2in outer diameter and 30cm high, the pressure does not exceed 0.02Mpa...

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Abstract

The invention relates to a performance tester for a gel valve in the course of underbalance well drilling and well completion and an application thereof, which solves the problems of inaccurate performance evaluation of the gel valve in the course of underbalance well drilling and well completion of the integrated course that 1) the actual existential state of gel in the underground state; 2) the formation time and the strength of the gel at underground temperature and pressure; 3) the accurate description of the gel formation strength of the gel at different times and different temperatures (the integrated air impermeability and the pressure resistance strength of the gel); and 4) the gelout effect evaluation of a gel breaker along with the time at underground temperature and pressure. The measuring data of the tester can determine the volume of the gel required to be inserted for plugging underground fluid at certain differential pressure, the strength change of the underground gel along with the time and the time of the gel valve for plugging the underground pressure.

Description

Technical field [0001] The invention relates to a jelly valve performance tester during underbalanced drilling and well completion and its application, which is applied to the field of oil and gas field drilling in petroleum exploration and development. Background technique [0002] Underbalanced drilling is a new type of drilling technology developed in the 1990s. It adapts to the current exploration and development situation of the petroleum industry and has many technical advantages. Therefore, it has developed very rapidly and has broad application prospects. However, conventional underbalanced drilling is mainly for the drilling process, and the method of killing the well is still used in the process of bit changing, coring, midway testing and handling accidents. Practice has proved that this approach still has a strong pollution effect on the pay zone. [0003] With the in-depth research and popularization and application of underbalanced drilling technology, domestic and fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01M3/28
Inventor 李志勇蒋官澄王利国谢水祥陶冶杨虎冯文强付英军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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