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Air sac type well pressure measuring pressure transmission tube

A downhole pressure and airbag technology, applied in the direction of measuring fluid pressure, measuring devices, instruments, etc., can solve the problems of inaccurate pressure measurement, time-consuming and workload, etc., to reduce production costs, expand the scope of application, improve daily The effect of management level

Inactive Publication Date: 2003-10-22
OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned pressure transmission cylinder has the following defects in use: 1. When gas leakage occurs at the ground end of the capillary steel pipe or the downhole pressure is greatly increased, the gas in the cylinder will gradually decrease, and the downhole liquid will enter from the pressure transmission hole of the pressure transmission cylinder. The liquid interface will gradually rise and finally enter the capillary steel pipe, which will cause inaccurate pressure measurement. The liquid needs to be blown out from the capillary steel pipe. This work will consume a lot of time and workload, and sometimes it cannot be blown out.
2. When the downhole production fluid contains gas, the gas will mix with the gas blown from the ground, resulting in inaccurate pressure measurement

Method used

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  • Air sac type well pressure measuring pressure transmission tube
  • Air sac type well pressure measuring pressure transmission tube
  • Air sac type well pressure measuring pressure transmission tube

Examples

Experimental program
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Effect test

Embodiment 1

[0010] Embodiment 1: the following in conjunction with the attached figure 1 The present invention is further described in detail. The airbag-type downhole pressure test pressure transmission cylinder has an outer tube 2, and the outer tube 2 is provided with a pressure transmission hole 4 and a capillary steel pipe interface 1, and an airbag 3 is installed in the outer tube 2. The airbag 3 is made of flexible materials, such as rubber, rubber plus elastic material, rubber plus fiber products, etc. The opening of the airbag 3 communicates with the capillary steel pipe interface 1. The wall of the airbag 3 is provided with a vent valve 5, which is a one-way valve, so that gas can only escape from the airbag 3, and external liquid cannot enter from the outside of the airbag 3. Connect the capillary steel pipe interface 1 of the present invention with the capillary steel pipe, and go down to the pressure measuring position in the well. Because the wall of the air bag 3 is provide...

Embodiment 2

[0011] Embodiment 2: the following in conjunction with the attached figure 2 The present invention is further described in detail. The air bag type downhole pressure test pressure transmission cylinder has an outer pipe 2 and an inner pipe 6. The outer pipe 2 or the inner pipe 6 are provided with a pressure transmission hole 4 and a capillary steel pipe interface 1. Attached figure 2 The figure shows that the outer tube 2 is provided with a pressure transmission hole 4 and a capillary steel pipe interface 1 . The airbag 3 is installed in the annular space between the outer tube 2 and the inner tube 6 . The opening of the air bag 3 communicates with the capillary steel pipe interface 1 . Air bag 3 is made of flexible material, as: rubber, rubber adds elastic material, rubber adds fiber product etc., and its wall is provided with air release valve 5, and this valve is a one-way valve. The gas can only escape from the air bag 3, and the external liquid cannot enter from outsi...

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Abstract

An air sec type well-pressure measuring pressure-transmission tube is used in the pressure test of oil and gas well. There are two technological schemes, one of them has outer pipe with pressure transferring hole and steel capillary tube interface and air sac installed; and the other has inner pipe and outer pipe with pressure transferring hole and steel capillary tube and air sac installed in the ring space between the inner pipe and the outer pipe. Each of the two schemes has one-way release valve on the air sac, so that the liquid and ga sin the well can not enter the steel capillary tube and the pressure measured in accurate. The present invention may be set horizontally in inclined well and horizontal well and the application range is widened. The present invention can raise the control level of oil and gas well and lower production cost.

Description

technical field [0001] The invention relates to oil production equipment in the petroleum industry, in particular to an air bag type downhole pressure test pressure transmission cylinder, which is suitable for oil and gas wells that need to test downhole formation pressure. technical background [0002] In the mining site of the oil industry, there is a capillary pressure measurement technology in the downhole pressure testing technology of oil wells, and the pressure transmission cylinder is its main component. A thin steel pipe, also called capillary steel pipe, is connected with the pressure transmission cylinder at the lower end and connected with the ground pressure measuring device at the upper end. The pressure transmission cylinder and the capillary steel pipe are filled with gas, and the downhole pressure is transmitted to the ground through the gas, so as to measure the downhole pressure. Due to the simple structure of the pressure transmission cylinder, it can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L19/00
Inventor 王世杰
Owner OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD