CN112412436B - Underground parameter measurement monitoring system - Google Patents

Underground parameter measurement monitoring system Download PDF

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Publication number
CN112412436B
CN112412436B CN202011178672.3A CN202011178672A CN112412436B CN 112412436 B CN112412436 B CN 112412436B CN 202011178672 A CN202011178672 A CN 202011178672A CN 112412436 B CN112412436 B CN 112412436B
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China
Prior art keywords
short section
sealing
signal conversion
sensor
section
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CN202011178672.3A
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CN112412436A (en
Inventor
段文广
孙宝江
潘登
刘健
王志远
张剑波
付玮琪
童仕坤
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China University of Petroleum East China
CNPC Xibu Drilling Engineering Co Ltd
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China University of Petroleum East China
CNPC Xibu Drilling Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/06Measuring temperature or pressure

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics (AREA)
  • Mechanical Engineering (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

The invention relates to a downhole parameter measuring and monitoring system which comprises a main body, wherein a protective sleeve is sleeved outside the main body, the lower end of the main body is in butt joint with a sensor short section, the sensor short section is divided into an upper sensor short section and a lower sensor short section, an outer cylinder is sleeved outside the sensor short section, the upper end of the outer cylinder is in butt joint with the lower end of the protective sleeve, the lower end of the lower sensor short section is connected with a bypass short section, the lower end of the outer cylinder is in butt joint with a signal conversion short section, the lower end of the signal conversion short section is in butt joint with an instrument outer cylinder, and a probe outer cylinder is arranged inside the instrument outer cylinder. The invention has the beneficial effects that: the working condition of the underground drilling tool is monitored in real time, the underground drilling working condition is mastered in time, accidents are avoided or reduced, economic loss is reduced, and the exploration and development process is accelerated.

Description

Underground parameter measurement monitoring system
Technical Field
The invention relates to a downhole parameter measuring and monitoring system, and belongs to the field of oil and gas extraction.
Background
Because the well drilling process is concealed and complicated, well drilling accidents in deep wells and ultra-deep wells with complicated stratums are frequent, the exploration and development of oil and gas fields are severely restricted, and huge economic loss is caused. In the process of oil field exploitation, monitoring and automatic control of field projects are indispensable for safe and economic operation, and downhole temperature and pressure need to be measured timely. Particularly, in a pilot test and a field project test of petroleum thermal recovery, the temperature and the pressure at the bottom of a well are high, so that the temperature and the pressure at the bottom of the well need to be measured continuously and sampled to read. Because the underground measurement condition and the precision requirement are higher, the continuous monitoring oil field underground temperature and pressure device with high precision, low cost and good real-time property is urgently needed to be developed and researched by people.
With the development of measurement while drilling technology, the development and the attack of an underground parameter measurement system are carried out at home and abroad, the measurement of single parameters such as well deviation, direction, pressure and the like is realized, and the problems of unstable underground work, poor field applicability and the like exist. The systems such as copilot, NDS and the like developed and popularized by foreign companies have good effects in field application, but the foreign technologies are not sold in China at present. The invention solves the problem that the instruments are not suitable in earlier stage in China, makes up for the shortage of domestic technology and breaks through the monopoly of foreign technology.
Disclosure of Invention
In order to solve the technical defects, the invention provides the underground parameter measuring and monitoring system which can monitor the working condition of the underground drilling tool in real time, avoid or reduce the occurrence of accidents and reduce the economic loss.
The invention is realized by the following measures:
a downhole parameter measuring and monitoring system comprises a main body, wherein a protective sleeve is sleeved outside the main body, the lower end of the main body is butted with a sensor short joint, the sensor short section is divided into an upper sensor short section and a lower sensor short section, an outer cylinder is sleeved outside the sensor short section, the upper end of the outer cylinder is butted with the lower end of the protective sleeve, the outer cylinder is provided with a pressure transfer hole, a seal ring capable of sealing the pressure transfer hole is sleeved on the lower section of the sensor short section, the lower end of the lower section of the sensor short section is connected with a bypass short section, the lower end of the outer cylinder is butted with a signal conversion short section, the lower end of the signal conversion short section is butted with the outer cylinder of the instrument, a conductive sliding ring is arranged between the signal conversion short section and the outer cylinder of the instrument, an outer cylinder of the probe tube is arranged in the outer cylinder of the instrument, an upper sealing plug of the probe tube is arranged at the upper end of the outer cylinder of the probe tube, a lower sealing plug of the probe tube is arranged at the lower end of the outer cylinder of the probe tube, and a sealing plug pressing ring is arranged at the lower end of the lower sealing plug of the probe tube; the inner tube signal conversion sealing joint is arranged in the signal conversion short section, a lower rotary outer joint outer barrel is connected between the inner tube signal conversion sealing joint and the bypass short section, and an elastic telescopic barrel, a compression spring, a contact pin female head, an elastic retainer ring for a hole, a contact pin male head, a contact pin pressing cap and a contact pin pressing ring are arranged in the lower rotary outer joint outer barrel.
A tension sensor is arranged between the protective sleeve and the body, a sealing ring is arranged between the protective sleeve and the body, and an end face hole plug is arranged at the upper end of the main body.
The outer cylinder is connected with the signal conversion nipple through a screw thread and is provided with a sealing ring, the upper end of the upper section of the sensor nipple is connected with the body through a screw thread and is provided with a sealing ring, the lower end of the upper section of the sensor nipple is connected with the lower section of the sensor nipple through a screw thread and is provided with a sealing ring, the lower section of the sensor nipple is connected with a connecting sleeve through a bypass nipple, the connecting sleeve is provided with a sealing ring, the inner cylinder signal conversion sealing joint is fixed with a sealing plug pressing ring, the sealing ring is arranged on the inner cylinder signal conversion sealing joint, the lower rotation outer joint outer cylinder is connected with the bypass nipple and the conversion sealing joint through a screw thread, and the sealing ring is arranged at the joint.
The body, the signal conversion short section and the instrument outer barrel are all connected with a test port top cover through hexagon socket head cap screws, and a sealing ring is sleeved on the test port top cover.
An anti-rotation screw hole is transversely formed in the upper section of the sensor short section, and an inner hexagonal socket head cap screw is installed in the anti-rotation screw hole.
The invention has the beneficial effects that: the working condition of the underground drilling tool is monitored in real time, the underground drilling working condition is mastered in time, accidents are avoided or reduced, economic loss is reduced, and the exploration and development process is accelerated.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a partially enlarged schematic view of the present invention.
Fig. 3 is a partially enlarged schematic view of the present invention.
Fig. 4 is a partially enlarged structural diagram of the present invention.
Wherein: the device comprises a body 1, a 2 end face hole plug, a 3 test port top cover, a 4 protective sleeve, a 5 outer cylinder, a 6 sensor short section upper section, a 7 sensor short section lower section, an 8 connecting sleeve, a 9 bypass short section, a 10 inner hexagonal cylinder head screw, a 11 compression spring, a 12 pin female head, a 13 elastic telescopic cylinder, a 14 hole elastic retainer ring, a 15 pin pressing cap, a 16 inner cylinder signal conversion sealing joint, a 17 pin pressing ring, a 18 lower rotation outer joint outer cylinder, a 19 signal conversion short section, a 20 pin male head, a 21 conductive sliding ring, a 23 instrument outer cylinder, a 24 probe upper sealing plug, a 25 probe outer cylinder, a 26 sealing plug pressing ring and a 27 probe lower sealing plug.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1-4, a downhole parameter measuring and monitoring system comprises a main body, a protective sleeve 4 is sleeved outside the main body, a sensor short section is butted at the lower end of the main body, the sensor short section is divided into a sensor short section upper section 6 and a sensor short section lower section 7, an outer cylinder 5 is sleeved outside the sensor short section, the upper end of the outer cylinder 5 is butted with the lower end of the protective sleeve 4, a pressure transfer hole is formed in the outer cylinder 5, a sealing ring capable of sealing the pressure transfer hole is sleeved on the sensor short section lower section 7, a bypass short section 9 is connected at the lower end of the sensor short section lower section 7, a signal conversion short section 19 is butted at the lower end of the outer cylinder 5, an instrument short section outer cylinder 23 is butted at the lower end of the signal conversion short section 19, a conductive slip ring 21 is arranged between the signal conversion section 19 and the instrument outer cylinder 23, a probe outer cylinder 25 is arranged inside the instrument outer cylinder 23, a probe upper sealing plug 24 is arranged at the upper end of the probe outer cylinder 25, a probe lower sealing plug 27 is arranged at the lower end of the probe outer cylinder 25, the lower end of the lower sealing plug 27 of the probe tube is provided with a sealing plug pressing ring 26; an inner cylinder signal conversion sealing joint 16 is arranged in the signal conversion short section 19, a lower rotary outer joint outer cylinder 18 is connected between the inner cylinder signal conversion sealing joint 16 and the bypass short section 9, and an elastic telescopic cylinder 13, a compression spring 11, a pin female head 12, an elastic retainer ring 14 for a hole, a pin male head 20, a pin pressing cap 15 and a pin pressing ring 17 are arranged in the lower rotary outer joint outer cylinder 18.
A tension sensor is arranged between the protective sleeve 4 and the body 1, a sealing ring is arranged between the protective sleeve 4 and the body 1, and an end face hole plug 2 is arranged at the upper end of the main body. The outer cylinder 5 is connected with the signal conversion short section 19 through a screw thread and is provided with a sealing ring, the upper end of the upper section 6 of the sensor short section is connected with the body 1 through a screw thread and is provided with a sealing ring, the lower end of the upper section is connected with the lower section 7 of the sensor short section through a screw thread and is provided with a sealing ring, the lower section 7 of the sensor short section is connected with the connecting sleeve 8 through the bypass short section 9, the connecting sleeve 8 is provided with a sealing ring, the inner cylinder signal conversion sealing joint 16 is fixed with a sealing plug pressing ring 26, the inner cylinder signal conversion sealing joint 16 is provided with a sealing ring, the lower rotation outer joint outer cylinder 18 is connected with the bypass short section 9 and the conversion sealing joint through a screw thread, and the sealing ring is arranged at the joint. The body 1, the signal conversion short section 19 and the instrument outer cylinder 23 are all connected with a test port top cover 3 through inner hexagonal socket head cap screws 10, and a sealing ring is sleeved on the test port top cover 3. An anti-rotation screw hole is transversely formed in the upper section 6 of the sensor short section, and an inner hexagonal socket head cap screw 10 is installed in the anti-rotation screw hole.
The end face hole plug 2 is sleeved with a sealing ring and connected with the body 1 through a screw thread, the sealing ring is sleeved on the test port top cover 3 and then fixed on the body 1, the signal conversion short section 19 and the instrument outer barrel 23 through hexagon socket head cap screws 10, the protective sleeve 4 is sleeved on the lower portion of the body 1, and a tension sensor is installed between the protective sleeve 4 and the body 1 and sealed through the sealing ring. The urceolus 5 utilizes the screw thread to be connected with signal conversion nipple joint 19 to seal with the sealing washer, 6 one end in sensor nipple joint upper segment utilizes the screw thread to link to each other with body 1, the other end utilizes the screw thread to link to each other with sensor nipple joint hypomere 7 and seal with the sealing washer respectively, 6 both ends in sensor nipple joint upper segment have still designed the installation and prevent changeing the screw hole, install hexagon socket head cap screw 10 in the screw hole and be used for preventing the relative rotation between body 1, sensor nipple joint upper segment 6 and the sensor nipple joint hypomere 7 three. The lower section 7 of the sensor short section is sleeved in the outer barrel 5, a pressure transmission hole is formed in the outer barrel 5, a sealing ring is arranged on the lower section 7 of the sensor short section and used for sealing the pressure transmission hole in the outer barrel 5, the lower section 7 of the sensor short section is connected with the bypass short section 9 through the connecting sleeve 8, the sealing ring is arranged on the connecting sleeve 8, the signal conversion short section 19 is connected to the lower portion of the outer barrel 5 through a screw thread, an inner barrel signal conversion sealing joint 16 is arranged inside the signal conversion short section 19 and fixed through a sealing plug pressing ring 26, the sealing ring is designed on the conversion sealing joint, and the bypass short section 9 and the conversion sealing joint are connected together through the screw thread by. An elastic telescopic cylinder 13, a compression spring 11, a pin female head 12, an elastic retainer ring 14 for holes, a pin male head 20, a pin pressing cap 15 and a pin pressing ring 17 are arranged in the lower rotary outer joint outer cylinder 18. The lower part of the signal conversion short section 19 is connected with an instrument outer cylinder 23 through a screw thread, a conductive sliding ring 21 is arranged between the instrument outer cylinders 23 and connected with the lower part of the signal conversion short section 19 through a screw thread, a probe outer cylinder 25 is arranged inside the instrument outer cylinder 23, a probe upper sealing plug 24 is arranged at the upper end of the probe outer cylinder 25, a probe lower sealing plug 27 is arranged at the lower end of the probe outer cylinder and is sealed by a sealing ring, and a sealing plug pressing ring 26 is further arranged at the lower end of the probe lower sealing plug 27 and is used for.
The foregoing is only a preferred embodiment of this patent, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of this patent, and these modifications and substitutions should also be regarded as the protection scope of this patent.

Claims (2)

1. A downhole parameter measurement monitoring system, characterized in that: the device comprises a main body, wherein a protective sleeve is sleeved outside the main body, a sensor short section is butted at the lower end of the main body and is divided into an upper sensor short section and a lower sensor short section, an outer barrel is sleeved outside the sensor short section, the upper end of the outer barrel is butted with the lower end of the protective sleeve, a pressure transfer hole is formed in the outer barrel, a sealing ring capable of sealing the pressure transfer hole is sleeved on the lower sensor short section, a bypass short section is connected with the lower end of the lower sensor short section, a signal conversion short section is butted at the lower end of the outer barrel, an instrument outer barrel is butted at the lower end of the signal conversion short section, a conductive sliding ring is arranged between the signal conversion short section and the instrument outer barrel, an outer probe barrel is arranged in the instrument outer barrel, an upper probe is arranged at the upper end of a probe outer barrel, a lower probe sealing plug is arranged at the lower end of the probe outer barrel, and a sealing plug pressing ring for sealing the lower end of the probe barrel is arranged at the lower end of the lower probe sealing plug; an inner cylinder signal conversion sealing joint is arranged in the signal conversion short section, a lower rotary outer joint outer cylinder is connected between the inner cylinder signal conversion sealing joint and the bypass short section, and an elastic telescopic cylinder, a compression spring, a contact pin female head, a hole elastic retainer ring, a contact pin male head, a contact pin pressing cap and a contact pin pressing ring are arranged in the lower rotary outer joint outer cylinder;
the outer cylinder is connected with the signal conversion short section through a screw thread and is provided with a sealing ring, the upper end of the upper section of the sensor short section is connected with the body through a screw thread and is provided with a sealing ring, the lower end of the upper section of the sensor short section is connected with the lower section of the sensor short section through a screw thread and is provided with a sealing ring, the lower section of the sensor short section is connected with a connecting sleeve through a bypass short section, the connecting sleeve is provided with a sealing ring, a sealing plug pressing ring is fixed on the inner cylinder signal conversion sealing joint, the sealing ring is arranged on the inner cylinder signal conversion sealing joint, the lower rotation outer joint outer cylinder is connected with the bypass short section and the conversion sealing joint through a screw thread, and the sealing ring is arranged at the connecting position;
the body, the signal conversion short section and the instrument outer cylinder are all connected with a test port top cover through inner hexagonal socket head cap screws, and a sealing ring is sleeved on the test port top cover;
an anti-rotation screw hole is transversely formed in the upper section of the sensor short section, and an inner hexagonal socket head cap screw is installed in the anti-rotation screw hole.
2. The downhole parameter measurement monitoring system of claim 1, wherein: a tension sensor is arranged between the protective sleeve and the body, a sealing ring is arranged between the protective sleeve and the body, and an end face hole plug is arranged at the upper end of the main body.
CN202011178672.3A 2020-10-29 2020-10-29 Underground parameter measurement monitoring system Active CN112412436B (en)

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Application Number Priority Date Filing Date Title
CN202011178672.3A CN112412436B (en) 2020-10-29 2020-10-29 Underground parameter measurement monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011178672.3A CN112412436B (en) 2020-10-29 2020-10-29 Underground parameter measurement monitoring system

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CN112412436A CN112412436A (en) 2021-02-26
CN112412436B true CN112412436B (en) 2021-07-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059860C1 (en) * 2000-11-30 2002-06-06 Becfield Drilling Services Gmb Coupling, for borehole measurement unit, in a drilling pipe, has a lower coupling pin which sits in an opening at a chamber together with a damper mechanism to prevent high frequency oscillations
CN202578665U (en) * 2011-12-29 2012-12-05 中天启明石油技术有限公司 Distance-adjustable underground equipment connector suitable for drill collar connection
CN202866785U (en) * 2012-11-16 2013-04-10 中国石油集团渤海钻探工程有限公司 Circuit switching and mud flow guiding integrated device of measuring instrument while drilling
CN105804719A (en) * 2016-04-07 2016-07-27 中国海洋石油总公司 Internal wiring structure of pup joint of well logging instrument during drilling

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100350127C (en) * 2005-11-26 2007-11-21 太原理工大学 Butt-joint drilling rod capable of transmitting electric signal
GB0703470D0 (en) * 2007-02-22 2007-04-04 Gomez Michael J J Apparatus for determining the dynamic forces on a drill string during drilling operations
CN201851102U (en) * 2010-11-20 2011-06-01 中国石油集团西部钻探工程有限公司 Drilling pressure and torque measuring-transmitting device
US8695727B2 (en) * 2011-02-25 2014-04-15 Merlin Technology, Inc. Drill string adapter and method for inground signal coupling
US10844665B2 (en) * 2016-11-07 2020-11-24 Sanvean Technologies Llc Wired motor for realtime data
CN206280066U (en) * 2016-12-09 2017-06-27 中国石油集团西部钻探工程有限公司 Drilling tool formula hole deviation and azimuthal measurement pipe nipple
CN109025974B (en) * 2018-09-18 2024-02-02 中国石油天然气集团有限公司 Long duration mud pulse while drilling bottom pressure monitoring device
CN210768630U (en) * 2019-09-24 2020-06-16 中国石油集团西部钻探工程有限公司 Conductive drill rod joint for downhole automation tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059860C1 (en) * 2000-11-30 2002-06-06 Becfield Drilling Services Gmb Coupling, for borehole measurement unit, in a drilling pipe, has a lower coupling pin which sits in an opening at a chamber together with a damper mechanism to prevent high frequency oscillations
CN202578665U (en) * 2011-12-29 2012-12-05 中天启明石油技术有限公司 Distance-adjustable underground equipment connector suitable for drill collar connection
CN202866785U (en) * 2012-11-16 2013-04-10 中国石油集团渤海钻探工程有限公司 Circuit switching and mud flow guiding integrated device of measuring instrument while drilling
CN105804719A (en) * 2016-04-07 2016-07-27 中国海洋石油总公司 Internal wiring structure of pup joint of well logging instrument during drilling

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