Online continuous monitoring sampling protecting device for external oil-water well casing pressure

A protection device, a technology for oil and water wells, applied in surveying, wellbore/well components, earth-moving drilling, etc., can solve the problems of waste, casing damage, casing repair costs, etc., to reduce the probability of damage and facilitate analysis Effect

Active Publication Date: 2015-02-25
DAQING UNIVERSITIES GASOLINEEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to investigation and statistics, in wells with casing damage, about 60% of the casing deformation or dislocations are located in the standard layer (Nen 2 Member) of the oil field, and most oil fields have the standard layer (Nen 2 Member) at a depth of about It is between 600 and 1000 meters, and this standard layer is mainly tight argillaceous shale with bedding phenomenon. Tight argillaceous shale is genera

Method used

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  • Online continuous monitoring sampling protecting device for external oil-water well casing pressure

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] Depend on figure 1 As shown, an oil-water well casing external pressure online continuous monitoring sampling protection device is composed of a surface device 18 and an underground device 31, and the two are connected by a pressure measurement sampling pipe 4. During the drilling process, after the drilling tool is taken out, the pressure sampling pipe 4 and the production casing 23 are lowered at the same time, and the clamps fix the two, so that the pressure sampling pipe 4 and the underground device 31 are placed in the open hole 3 and the production casing Between 23, the surface casing 2 and the conduit 1 are arranged outside the naked hole 3, and the oil pipe 24 is inside the production casing 23. The upper part of the pressure measuring and sampling pipe 4 is connected to the ground device 18, and the lower part of the pressure measuring and sampling pipe 4 ...

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Abstract

The invention relates to an online continuous monitoring sampling protecting device for external oil-water well casing pressure. The problem that an existing casing is damaged by being extruded or broken is mainly solved. The online continuous monitoring sampling protecting device is characterized in that the upper portion of a pressure measuring sampling tube (4) is connected with a ground device (18), the lower portion of the pressure measuring sampling tube (4) is connected with a pressure sampling sampler (8), the ground device (18) is arranged at the position of an oil-water well mouth (27) and comprises a tee joint I (17), the lower portion of the tee joint I (17) is connected with a well shut-in valve (30), the lower portion of the well shut-in valve (30) is connected with the pressure measuring sampling tube (4), the upper portion of the tee joint I (17) is connected with a liquid injection exhaust and drainage valve (16), and a side face connector of the tee joint I (17) is connected with a pressure measuring recording instrument (14) and a sampling valve (13). According to the online continuous monitoring sampling protecting device, changes of the external casing pressure and changes of water quality components can be monitored in real time, so that corresponding measures are adopted before the casing is extruded or broke, and casing damages are avoided or reduced.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to an online continuous monitoring and sampling of oil and water well casing external pressure for online real-time monitoring, real-time sampling, and protection of oil and water well casing from being squeezed or broken. protective device. Background technique [0002] In recent years, due to the increase of injection and production intensity in oilfields, there have been many casing damage areas in old oilfields. In some blocks, the number of casing damage wells accounts for about 50% of the total number of wells, and the range of casing damage is increasing year by year. At present, there is no uniform rule in the extrusion direction of the casing, and the overall height of the standard layer (Nen 2 section) is about 10 meters. "S" shape. In addition, the extrusion direction between adjacent wells is uncertain. In the same block, good wells and bad wells are alternately interrupted...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B49/08
CPCE21B47/06E21B49/088
Inventor 李福军李晓川宋经纬
Owner DAQING UNIVERSITIES GASOLINEEUM TECH
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