CN110644972A - Underground connection structure of layered oil production layered test system cable - Google Patents
Underground connection structure of layered oil production layered test system cable Download PDFInfo
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- CN110644972A CN110644972A CN201911083621.XA CN201911083621A CN110644972A CN 110644972 A CN110644972 A CN 110644972A CN 201911083621 A CN201911083621 A CN 201911083621A CN 110644972 A CN110644972 A CN 110644972A
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- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 238000007789 sealing Methods 0.000 claims abstract description 55
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/023—Arrangements for connecting cables or wirelines to downhole devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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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)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses an underground connection structure of a layered oil extraction layered test system cable, which comprises a multi-stage underground instrument string (2) connected in series through a coupling (1); each stage of downhole instrument string comprises an upper rotary joint (3), an upper crossing pipe (4), a packer (5), a downhole instrument (6), a current-stage coupling (7), a lower crossing pipe (8) and a lower rotary joint (9) which are sequentially connected from top to bottom; the upper end of the underground instrument is provided with a current-level upper section cable (10), and the lower end of the underground instrument is provided with a current-level lower section cable (11); the cable at the upper section of the current stage passes through an internal channel of the packer and is led out to the outside of the underground instrument string through an upper through pipe, and the outside of the underground instrument string is hermetically connected with a cable (13) of a superior underground instrument string through an upper sealing joint (12); the lower section cable of the stage passes through the inner channel of the coupling of the stage and is led out to the outside of the underground instrument string through the lower passing pipe; and the outer part of the downhole tool string is hermetically connected with a cable (15) of the lower-level downhole tool string through a lower sealing joint (14).
Description
Technical Field
The invention relates to an underground connection structure of a layered oil production layered test system cable, belonging to the technical field of oil field well logging and well testing instruments.
Background
For a long time, the layered oil extraction and the layered test of an oil well in the oil field development process mainly take a storage type instrument as a main part. The storage type instrument can only execute one command when going down the well once, and can read the test data only after the instrument is taken out, so that the test data can not be read in real time and the action of the underground instrument can not be controlled, and the change condition of each production position of the oil well can not be mastered in real time.
As the demand for downhole control in oil fields increases, downhole tools have also evolved from storage tools to direct reading tools. The direct-reading instrument is simple to operate, data reading is visual, and the device can acquire the layering pressure, temperature values and the like of each period by matching with ground equipment to know the change rule of reservoir parameters, so that reserve capacity estimation and capacity budget are carried out. Meanwhile, the underground instrument can be controlled to act at any time according to needs, the underground instrument can enter a working state quickly, and the repeated well entering and exiting cost is reduced. The direct-reading instrument can greatly improve the technical level of formation testing, improve the accuracy of testing data, enhance the comparability of all layers in the same well, and has important guiding significance for the development and exploration of oil and gas reservoirs.
The direct-reading instrument needs to be connected with a cable during use. The electrification, test action and data transmission of the downhole instrument are inseparable from the cable. The underground working condition is complex, and the reliability of the existing direct-reading instrument used for the layered oil production layered test system is not ideal. Therefore, there is a need for an improvement in the existing cable connection of direct reading devices.
Disclosure of Invention
The invention aims to provide an underground connection structure of a layered oil production layered test system cable, so as to improve the reliability of cable connection and ensure the normal and reliable operation of the whole layered oil production layered test system, thereby overcoming the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an underground connection structure of a layered oil production and layered test system cable, which comprises a multi-stage underground instrument string connected in series through a coupling; each stage of downhole instrument string comprises an upper rotary joint, an upper crossing pipe, a packer, a downhole instrument, a coupling at the stage, a lower crossing pipe and a lower rotary joint which are sequentially connected from top to bottom; the upper end of the underground instrument is provided with a current-stage upper section cable, and the lower end of the underground instrument is provided with a current-stage lower section cable; the cable at the upper section of the stage penetrates through an internal channel of the packer and is led out to the outside of the underground instrument string through the upper penetrating pipe, and the outside of the underground instrument string is in sealing connection with the cable of the upper-stage underground instrument string through the upper sealing joint; the lower section cable of the stage passes through the inner channel of the coupling of the stage and is led out to the outside of the underground instrument string through the lower passing pipe; and the outside of the underground instrument string is hermetically connected with a cable of a lower-level underground instrument string through a lower sealing joint.
In the underground connecting structure, sealing parts are arranged at the joints of the upper end and the lower end of the underground instrument and the cable.
In the downhole connecting structure, the cable leading-out positions of the upper crossing pipe and the lower crossing pipe are provided with sealing parts.
In the underground connecting structure, the upper end and the lower end of the upper sealing joint and the lower sealing joint and the leading-out part of the cable are respectively provided with a sealing element.
In the underground connecting structure, the upper sealing joint is fixedly connected with the outer wall of the upper rotating joint through a stainless steel strapping tape.
In the underground connecting structure, the lower sealing joint is fixedly connected with the outer wall of the lower rotating joint through a stainless steel strapping tape.
Due to the adoption of the technical scheme, compared with the prior art, the invention adopts the common packer to replace the cable-passing packer with higher price in the prior art. The outer pipe of the underground instrument has no special structure, and the connection cost is low. The underground instrument and the packer do not need to be connected through a cable, the underground instrument does not need to be eccentrically led out of the cable, the installation of the cable and the connection of a system are facilitated, and the reliability is high. After passing through the packer, the cable is led out to the outer wall of the oil pipe through the through pipe, and a coupling protector can be installed at each coupling to effectively protect the cable. The technical scheme of the invention can be applied to not only vertical wells or small-slope wells, but also highly-deviated wells and even horizontal wells.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The labels in the figures are: 1-coupling, 2-downhole instrument string, 3-upper rotary joint, 4-upper traversing pipe, 5-packer, 6-downhole instrument, 7-local coupling, 8-lower traversing pipe, 9-lower rotary joint, 10-local upper cable, 11-local lower cable, 12-upper sealing joint, 13-upper downhole instrument string cable, 14-lower sealing joint, 15-lower downhole instrument string cable, 16-sealing element and 17-stainless steel strapping tape.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention relates to a downhole connecting structure of a layered oil production layered testing system cable, which is shown in figure 1: comprises a multi-stage downhole instrument string 2 connected in series by a coupling 1; each stage of downhole instrument string 2 comprises an upper rotary joint 3, an upper crossing pipe 4, a packer 5, a downhole instrument 6, a current-stage coupling 7, a lower crossing pipe 8 and a lower rotary joint 9 which are sequentially connected from top to bottom; the upper end of the underground instrument 6 is provided with a current-stage upper-section cable 10, and the lower end of the underground instrument 6 is provided with a current-stage lower-section cable 11; the cable 10 at the upper section of the stage passes through an internal channel of the packer 5 and is led out to the outside of the underground instrument string 2 through the upper passing pipe 4, and the outside of the underground instrument string 2 is hermetically connected with a cable 13 of a superior underground instrument string through an upper sealing joint 12; the lower section cable 11 of the current stage passes through the inner channel of the current stage coupling 7 and is led out to the outside of the underground instrument string 2 through the lower passing pipe 8; outside the tool string 2 is sealingly connected via a lower sealing joint 14 to a cable 15 of a lower tool string. And sealing parts 16 are arranged at the joints of the upper end and the lower end of the underground instrument 6 and the cable. The cable exit of the upper and lower transit tubes 4, 8 is provided with a seal 16. And sealing elements 16 are arranged at the upper end and the lower end of the upper sealing joint 12 and the lower sealing joint 14 and at the leading-out positions of the cables. The upper sealing joint 12 is fixedly connected with the outer wall of the upper rotating joint 3 through a stainless steel strapping tape 17. The lower sealing joint 14 is fixedly connected with the outer wall of the lower rotary joint 9 through a stainless steel strapping tape 17.
Examples
The downhole connection structure of the layered oil production layered test system cable of the embodiment is shown in fig. 1: the upper end of the downhole instrument 6 is connected with the upper section cable 10 of the current stage, and is fixed and sealed by a sealing piece 16. The upper cable 10 of this stage is then led out through the internal passage of the packer 5, through the upper transit tube 4 to the outside of the downhole tool string 2. The upper cable 10 of the stage is still fixedly sealed by the sealing element 16 at the leading-out part of the upper crossing pipe 4. The upper section cable 10 of the current stage led out of the downhole tool string 2 and the upper stage downhole tool string cable 13 are connected by using an upper sealing joint 12 and are fixed and sealed. After the upper sealing joint 12 is installed, the upper sealing joint 12 is fixed on the outer wall of the upper adapter 3 by a stainless steel strapping tape 17. The upper level downhole instrument string cable 13 is connected with the lower sealing joint in the upper level downhole instrument string or extends to the wellhead along the outer wall of the oil pipe. The coupling 1 at the upper end of the upper rotary joint 3 is used for connecting an upper-level downhole instrument string or oil pipe. The lower section cable 11 of the current level at the lower end of the downhole instrument 6 is fixed and sealed by a sealing element 16, then the lower section cable 11 of the current level passes through the coupling 7 of the current level and is led out to the outside of the downhole instrument string 2 through the lower crossing pipe 8, the lower section cable 11 of the current level is still fixed and sealed by the sealing element 16, and the lower sealing joint 14 is adopted to lead out the lower section cable 11 of the current level to the outside of the downhole instrument string 2 to be connected with the cable 15 of the lower level downhole instrument string and is fixed and sealed. After the lower sealing joint 14 is installed, the lower sealing joint 14 is fixed to the outer wall of the lower adapter 9 by a stainless steel strapping tape 17. The cable 15 of the lower-level downhole instrument string is still connected with the cable of the lower-level downhole instrument string by adopting a sealing joint, and the lower rotary joint 9 is connected with the lower-level downhole instrument string or the oil pipe by the coupling 1.
In this example, the packer 5 functions to separate the different production levels of the well; the lower end of the packer 5 is connected with a downhole instrument 6, and the upper end is connected with the upper crossing pipe 4; the downhole instrument 6 controls the liquid output of the production oil layer through the opening and closing of a valve; the function of the upper and lower traversing pipes 4, 8 is to lead out the cable connected with the downhole tool 6 to the outside of the downhole tool string 2. The seal 16 functions to secure and seal the cable; the upper sealing joint 12 and the lower sealing joint 14 are used for connecting, fixing and sealing the upper and lower sections of cables. The upper adapter 3 is matched with the upper sealing joint 12 for use, so that the outer diameter of the upper sealing joint 12 cannot protrude out of the outer wall of the upper passing pipe 4 after the upper sealing joint is installed, and the upper sealing joint 12 is prevented from colliding in the process of going into a well. The lower rotary joint 9 is matched with the lower sealing joint 14 for use, so that the outer diameter of the lower sealing joint 14 cannot protrude out of the outer wall of the lower traversing pipe 8 after the lower sealing joint 14 is installed, and the lower sealing joint 14 is prevented from colliding in the process of going into a well. The primary purpose of collar 1 is to connect adjacent tool strings 2 together, or to connect tool strings 2, downhole accessories, or tubing of different functions together.
Claims (6)
1. An underground connection structure of a layered oil production and layered test system cable comprises a multi-stage underground instrument string (2) which is connected in series through a coupling (1); the method is characterized in that: each stage of downhole instrument string (2) comprises an upper rotary joint (3), an upper crossing pipe (4), a packer (5), a downhole instrument (6), a current stage coupling (7), a lower crossing pipe (8) and a lower rotary joint (9) which are sequentially connected from top to bottom; the upper end of the underground instrument (6) is provided with a current-level upper section cable (10), and the lower end of the underground instrument (6) is provided with a current-level lower section cable (11); the upper-section cable (10) of the current stage passes through an internal channel of the packer (5) and is led out to the outside of the underground instrument string (2) through the upper passing pipe (4), and the outside of the underground instrument string (2) is hermetically connected with the upper-stage underground instrument string cable (13) through the upper sealing joint (12); the lower section cable (11) of the current stage passes through the inner channel of the current stage coupling (7) and is led out to the outside of the underground instrument string (2) through the lower passing pipe (8); and the outside of the downhole instrument string (2) is hermetically connected with a cable (15) of a lower-level downhole instrument string through a lower sealing joint (14).
2. The downhole connection structure of a layered production and testing system cable according to claim 1, wherein: and sealing parts (16) are arranged at the joints of the upper end and the lower end of the underground instrument (6) and the cable.
3. The downhole connection structure of a layered production and testing system cable according to claim 1, wherein: and sealing elements (16) are arranged at cable leading-out positions of the upper crossing pipe (4) and the lower crossing pipe (8).
4. The downhole connection structure of a layered production and testing system cable according to claim 1, wherein: and sealing elements (16) are arranged at the upper end and the lower end of the upper sealing joint (12) and the lower sealing joint (14) and at the leading-out position of the cable.
5. The downhole connection structure of a layered production and testing system cable according to claim 1, wherein: the upper sealing joint (12) is fixedly connected with the outer wall of the upper rotating joint (3) through a stainless steel strapping tape (17).
6. The downhole connection structure of a layered production and testing system cable according to claim 1, wherein: the lower sealing joint (14) is fixedly connected with the outer wall of the lower rotating joint (9) through a stainless steel strapping tape (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911083621.XA CN110644972A (en) | 2019-11-07 | 2019-11-07 | Underground connection structure of layered oil production layered test system cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911083621.XA CN110644972A (en) | 2019-11-07 | 2019-11-07 | Underground connection structure of layered oil production layered test system cable |
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| Publication Number | Publication Date |
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| CN110644972A true CN110644972A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911083621.XA Pending CN110644972A (en) | 2019-11-07 | 2019-11-07 | Underground connection structure of layered oil production layered test system cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124230A1 (en) * | 2021-12-31 | 2023-07-06 | 百斯迈奇能源技术服务（深圳）有限公司 | Tank loading system and dual-electric submersible pump device |
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2019
- 2019-11-07 CN CN201911083621.XA patent/CN110644972A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023124230A1 (en) * | 2021-12-31 | 2023-07-06 | 百斯迈奇能源技术服务（深圳）有限公司 | Tank loading system and dual-electric submersible pump device |
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