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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 evaluation

Inactive Publication Date: 2011-11-02
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 first pressure reducing valve 2, the flow meter 3, the lower end pressure valve 6, install the bottom cover 15, put the temperature control probe 12 into the temperature control hose body 8, and preheat the instrument to 90°C;

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

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

[0033] (4) Open the lower end pressure valve 6 (note that the flow meter is closed at this time, because the large pipe pressure is high, the liquid is easy to flow back, so the lower end pressure valve cannot be opened too large), and then open the first pressure reducing valve 2, when th...

Embodiment 2

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

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

[0039] (2) Put the gasket into the temperature-controlled plastic tube body 8, and spread it flat on the pressure hole at the lower end, pour the prepared gel solution into the temperature-controlled plastic tube body 8, install the top cover 13, and Heating at 120°C for 5h;

[0040] (3) Before the test, close the temperature controller 5, pull out the temperature control probe 12; remove the top cover 13;

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

Embodiment 3

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

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

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

[0048] (3) Before the test, close the temperature controller 5, pull out the temperature control probe 12; remove the top cover 13;

[0049] (4) Open the lower end pressure valve 6 (note that the flow meter is closed at this time, because the large pipe pressure is high, the liquid is easy to flow back, so the lower end pressure valve cannot be opened too large), then open the first pressure reducing valve 2, when the control When the temperature-controlled hose body 8 has an outer diameter of 2in and a height of 30cm, the pressure does not exceed...

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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) theformation 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 in the process of underbalanced drilling and well completion and the application thereof, which is applied in the oil and gas field drilling field of petroleum exploration and development. Background technique [0002] Underbalanced drilling is a new 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 develops very rapidly and has broad application prospects. However, conventional underbalanced drilling is mainly aimed at the drilling process, and the method of killing wells is still used in the process of changing drill bits, coring, midway testing and handling accidents. Practice has proved that this practice still has a strong pollution effect on the production layer. [0003] With the in-depth research and popularization and application of underbalanced drilling ...

Claims

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Application Information

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Patent Type & Authority Patents(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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