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Well closing pressure measuring method for low pressure low permeation oil field oil water well

A low-permeability, oil-water well technology, applied in wellbore/well components, measurement, earthwork drilling and production, etc., can solve problems such as long cycle, low data accuracy, shorten oil-water well pressure measurement cycle, etc., to achieve reliable results, The effect of shrinking the wellbore storage space and shortening the wellbore storage time

Active Publication Date: 2007-10-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-pressure low-permeability oilfield oil-water well shut-in pressure measurement pipe string, which overcomes the problems of long cycle of conventional pressure and test wells and low accuracy of data in low-pressure and low-permeability oilfields, in order to reduce the wellbore storage effect. Due to the influence of the pressure curve, the radial flow section appears in the shortest possible time, shortens the pressure measurement cycle of oil and water wells, and takes all accurate reservoir data during the pressure measurement process to provide a reliable basis for later data interpretation; reduce the impact of pressure measurement Occupation of production time, improving the comprehensive benefits of oilfield development

Method used

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  • Well closing pressure measuring method for low pressure low permeation oil field oil water well
  • Well closing pressure measuring method for low pressure low permeation oil field oil water well
  • Well closing pressure measuring method for low pressure low permeation oil field oil water well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pressure measurement results of Well Yang 37-17: 2 days of running the test instrument and production, and the shut-in time after the packer was set was 122 hours. It can be seen from the double logarithmic curve stored in the pressure gauge that the test data of the well has been collected completely. Radial flow appeared 40 hours after shutting in the well, and the total logging time was 8 days, while the average testing time of conventional well testing in this block was 15 days. The well test results achieved the expected results.

[0028] Yang 37-17 well testing process: refer to attached drawing 2. The reservoir depth is 1046 meters and the thickness is 6.3 meters. First, pull out all production strings in Well Yang 37-17. Next, run into the piezometer string. From bottom to top, the pressure measuring string is oil pipe (2), shockproof tube (9), packer (7), screen pipes (6, 5), oil well pump (4) and sucker rod (1). Pressure gauge (10) is arranged in the shoc...

Embodiment 2

[0031]Pressure measurement results of Well Tian 22-24: From the comparison of pressure double logarithm-derivative curves, it can be seen that the downhole shut-in technology greatly reduces the influence of wellbore storage effect, reduces the continuous flow section, and greatly shortens the test time. The time for directional flow to appear is shortened from 300 hours for conventional well testing to 100 hours, and the average testing time for conventional well testing in this block is 20 days. The test cycle has been greatly reduced.

[0032] The pressure measurement process of Well Tian 22-24 is the same as that of Example 1, and the pipe string structure is the same. The difference is: first, the pressure gauge (10) is lowered into different depths depending on the depth of the reservoir (11). The depth is 1363 meters and the thickness is 14.8 meters. The 2nd, in the 5th step of the pressure measurement process, the time from shutting in the well to pulling out the pres...

Embodiment 3

[0034] Test results in Well 40-31: The average testing time for conventional well testing in this block is 25 days. After 337.5 hours of conventional testing, it is still in the wellbore storage stage, and the pressure rise rate is very slow. However, after shutting down the well, the pressure rises rapidly, and the shape of the curve changes significantly after 170 hours of pressure measurement, and the relevant data can be interpreted by using software.

[0035] The pressure measurement process in Well 40-31 is the same as that in Example 1, and the pipe string structure is the same. The difference is: first, the piezometer (10) is lowered into different depths depending on the depth of the reservoir (11), and the well reservoir (11) ) with a depth of 1605 meters and a thickness of 24.6 meters. The 2nd, in the 5th step of the pressure measurement process, the time from shutting in the well to pulling out the pressure gauge (10) is 6 days. Other pressure measurement process...

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Abstract

The invented method includes the following steps: firstly, taking out production pipe string; then down-placing piezometric pipe string with anti-vibration barrel and pressure meter; third, under the condition of that the packer is not set starting pump and making oil production; fourth, stopping pump and setting packer; fifth, well shut-in, pressure meter can be used for automatically measuring and recording pressure build-up data; finally, taking out pressure meter and inputting the above-mentioned data into computer, then processing and analyzing said pressure data.

Description

technical field [0001] The invention relates to the technical field of pressure measurement of oil and water wells in oil fields, in particular to a pipe string for pressure measurement of oil and water wells in low permeability oil fields. Background technique [0002] There are currently two conventional pressure measurement methods: [0003] Lifting the pump to measure the pressure: the technical process of this method is to lift the sucker rod and the oil pump in the wellbore out of the wellhead, and send the pressure gauge into the bottom of the well with a wire rope. Then shut down the well for pressure measurement and wait for the pressure to fully recover. Take out the steel wire rope and the pressure gauge, and use the computer to collect and process the pressure data of the pressure gauge. The pump pressure measurement must make the liquid flow continuously rise in the wellbore (see Figure 1). When the liquid level reaches a certain height, the liquid level does ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
Inventor 王公江张兴良车明李世辉孔鹏
Owner PETROCHINA CO LTD
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