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Testing method of oil well downhole rapid testing system

A technology of testing system and testing method, which is applied in the direction of wellbore/well components, measurement, earthwork drilling and production, etc., can solve problems such as inability to diagnose, and achieve the effect of simple operation, low cost and simple operation

Inactive Publication Date: 2016-06-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Undiagnosed due to pressure wave passing through the near-wellbore zone at 2 minutes

Method used

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  • Testing method of oil well downhole rapid testing system
  • Testing method of oil well downhole rapid testing system
  • Testing method of oil well downhole rapid testing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 As shown, the present invention provides a quick downhole test system for oil wells, comprising a casing 1, a test string 2 that is lowered into the casing, the bottom of the test string is sealed and isolated to form a closed body, and the gap between the test string and the casing is The annulus 4 between the test pipe string and the casing is sealed by the hydraulic packer 3, and the hydraulic packer is pressurized by the surface hydraulic pump 5 through the hydraulic pipeline 6 to realize the sealing. A downhole quick switch 7 is installed on the test string, and a storage pressure gauge 8 is installed at the bottom of the test string.

[0031] like figure 2 As shown, the downhole quick switch includes a switch outer cylinder 10, and a flow-limiting thin tube 11 is arranged inside the switch outer cylinder. The controller 12, the bottom of the capillary is sealed 13 by a thin film.

Embodiment 2

[0033] like figure 1 As shown, the present invention provides a quick downhole test system for oil wells, comprising a casing 1, a test string 2 that is lowered into the casing, the bottom of the test string is sealed and isolated to form a closed body, and the gap between the test string and the casing is The annulus 4 between the test pipe string and the casing is sealed by the hydraulic packer 3, and the hydraulic packer is pressurized by the surface hydraulic pump 5 through the hydraulic pipeline 6 to realize the sealing. A downhole quick switch 7 is installed on the test string, and a storage pressure gauge 8 is installed at the bottom of the test string.

[0034] like image 3 As shown, the downhole quick switch includes a switch outer cylinder 10, and a flow-limiting thin tube 11 is arranged inside the switch outer cylinder. Controller 12, a magnet ring 14 is installed at the bottom of the flow-limiting capillary, and the magnet ring is connected with a movable iron p...

Embodiment 3

[0037] Embodiment 3 Oil well downhole rapid test method

[0038] During the well testing process, the first step is to run the test string into the reservoir at a certain depth; before isolation, the wellbore has fluid flowing out through the annular space, and the bottomhole pressure at this time is not too high, for example, when the formation pressure is 10Mpa , the pressure in the flow process is only 6Mpa;

[0039] In the second step, the surface booster pump pressurizes the packer through the hydraulic pipeline during the test. When the packer pressure reaches the packer pressure, the packer seals the annulus between the test string and the casing;

[0040] In the third step, after isolation, the formation fluid will continuously collect into the wellbore, and the pressure will gradually increase during the collection process, for example, from the initial 6Mpa to 10Mpa, and then continue to rise;

[0041] In the fourth step, the downhole quick switch is turned on; when...

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Abstract

The invention discloses an oil well downhole rapid test system and test method. The test system comprises a casing pipe and a test pipe column arranged in the casing pipe. The bottom of the test pipe column is sealed to form a seal body, the space between the test pipe column and an oil well is sealed through a hydraulic type packer to form an annulus between the test pipe column and the oil well, the test pipe column is provided with a downhole high-speed switch, and a storage type pressure gauge is installed at the bottom of the test pipe column. The test system is a novel well testing system which is easy to operate and capable of achieving downhole flow quick changes, the switch can be turned on within 0.1s instantaneously, a rectangular time and flow relation curve is formed, and accordingly the problems that in the well testing process, the depth of a pollution zone is difficult to test and precision of the curve is hard to test are solved.

Description

technical field [0001] The invention relates to an oil well downhole rapid testing system and a testing method, belonging to the technical field of oil well testing in oil and gas field development engineering. Background technique [0002] At present, oil and gas field development projects need to test the underground pressure, and the commonly used method for oil and gas well testing is well testing. [0003] Well testing is to put sensors downhole, switch the well, test the pressure signal, that is, a series of data of pressure changing with time, and then calculate the formation information based on the mathematical model. [0004] Conventional oil well testing is performed at the wellhead. However, due to the influence of the wellbore storage effect, the elasticity of the formation is large, which has a great influence on the test results. [0005] In order to well avoid the wellbore storage effect, an existing technical method is to put the sensor downhole and then s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
Inventor 裴柏林张遂安陈兴波
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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