CN107100587B - Three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production - Google Patents
Three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production Download PDFInfo
- Publication number
- CN107100587B CN107100587B CN201710403907.6A CN201710403907A CN107100587B CN 107100587 B CN107100587 B CN 107100587B CN 201710403907 A CN201710403907 A CN 201710403907A CN 107100587 B CN107100587 B CN 107100587B
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- China
- Prior art keywords
- conversion
- sleeve
- sliding sleeve
- inspection
- control sliding
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/117—Detecting leaks, e.g. from tubing, by pressure testing
Abstract
The invention belongs to the field of oil extraction process equipment, and particularly relates to a string-testing, water-plugging and seal-testing three-in-one process pipe column for petroleum production. Conversion equipment, including top connection, center tube, spring, ball, change-over sleeve, control sliding sleeve, case, disk seat, conversion connector, gag lever post and lower clutch, top connection fixed connection is in the upper end of center tube, and conversion connector fixed connection is at the lower extreme of center tube, and spring, case and disk seat all overlap in the outside of center tube, and the disk seat passes through threaded connection in the upper end of conversion connector, lower clutch fixed connection at the lower extreme of conversion connector. The process pipe column can change three independent operations of three processes of string inspection, water plugging and seal inspection into one operation, greatly shortens the construction period, reduces the construction cost, reduces the environmental pollution and reduces the construction difficulty.
Description
Technical Field
The invention belongs to the field of oil extraction process equipment, and particularly relates to a three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production.
Background
In the process of oil field development and production, mechanical water plugging of an oil well refers to a technical measure for controlling produced water in the oil well. The produced water of the oil well mainly comes from the edge water, the bottom water and the injected water. This water invades the well along high permeability zones (or fractures). Plugging these high permeable layers (or cracks) can increase the sweep efficiency of water, thereby increasing the recovery of crude oil. The construction steps of the tubular column in the existing oil well mechanical water shutoff measures are mainly completed by six tubular columns in three processes of string inspection, water shutoff and seal inspection. The construction period is long, the cost is high, and the environment is easy to cause pollution. The construction process is simplified with great difficulty.
Disclosure of Invention
The invention provides a three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production, which aims to solve the problems in the background technology.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production, which comprises a packer, a conversion device, a releasing and water plugging bridge plug, wherein the packer, the conversion device, the releasing and the water plugging bridge plug are sequentially connected in series through oil pipes from top to bottom.
Conversion equipment, including top connection, center tube, spring, ball, change-over sleeve, control sliding sleeve, case, disk seat, conversion connector, gag lever post and lower clutch, top connection fixed connection is in the upper end of center tube, and conversion connector fixed connection is at the lower extreme of center tube, and spring, case and disk seat all overlap in the outside of center tube, and the disk seat passes through threaded connection in the upper end of conversion connector, lower clutch fixed connection at the lower extreme of conversion connector, the outside of change-over sleeve be provided with along the slide that the axial set up, the center tube on with the slide correspond and be provided with the gag lever post, the tip of gag lever post is inserted the slide in thereby restrict the axial stroke of change-over sleeve, the control sliding sleeve through set up the inboard of control sliding sleeve pin fixed connection on the change-over sleeve, be provided with the locking piece on the change-over sleeve to can be in the through-hole on the change-over sleeve lateral wall along radial movement under the promotion of inside and outside part, the ball place the upper end at the control sliding sleeve, the gag lever post through the inboard of control sliding sleeve pin connection on the control sliding sleeve fixed connection on the control sliding sleeve, the lower extreme of change-over the change-over is provided with the one-way liquid control fluid channel, the one-way is provided with the lower extreme that the locking spring is provided with the change-over liquid control fluid channel, the annular is provided with the switching sleeve, the one-way is provided with the switching sleeve.
Preferably, a valve seat sheath is arranged on the outer side of the valve seat.
Preferably, an adjusting ring is arranged between the upper joint and the spring, the adjusting ring is sleeved on the outer side of the central tube, and the upper end of the adjusting ring is connected to the upper joint through threads.
The beneficial effects of the invention are as follows: the invention improves the prior art, particularly designs a conversion device in research and development, controls the conversion device to act by pressing the oil pipe and the oil sleeve space, and can ensure that the process pipe column sequentially meets the process conditions required by string inspection, water plugging and seal inspection, so that three times of independent operations of the three processes of string inspection, water plugging and seal inspection are changed into one operation, and a six-time operation pipe column is changed into a two-time operation pipe column, thereby greatly shortening the construction period, reducing the construction cost, reducing the environmental pollution and lowering the construction difficulty.
Drawings
FIG. 1 is a schematic view of the structure of the conversion device of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
fig. 3 is a partially enlarged view of the core control mechanism of the present invention.
In the figure: in the figure: 1-upper joint, 2-central tube, 3-adjusting ring, 4-spring, 5-ball, 6-shifting sleeve, 7-control sliding sleeve, 8-valve core, 9-limit pin, 10-control pin, 11-valve seat sheath, 12-valve seat, 13-shifting connector, 14-limit rod, 15-locking block, 16-control sliding sleeve pin, 17-one-way valve, 18-lower joint, 19-locking spring fixing sleeve, 20-locking spring, 21-annular groove, 22-liquid passing channel, 23-liquid passing hole, 24-water blocking bridge plug, 25-releasing hand, 26-shifting device and 27-packer.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the embodiment comprises a packer 27, a conversion device 26, a releasing tool 25 and a water plugging bridge plug 24 which are connected in series sequentially through oil pipes from top to bottom.
The switching device 26 comprises an upper joint 1, a central pipe 2, a spring 4, a ball 5, a switching sleeve 6, a control sliding sleeve 7, a valve core 8, a valve seat 12, a switching connecting body 13, a limiting rod 14 and a lower joint 18.
Top connection 1 fixed connection is in the upper end of center tube 2, and conversion connector 13 fixed connection is at the lower extreme of center tube 2, and spring 4, case 8 and disk seat 12 all overlap in the outside of center tube 2, and disk seat 12 passes through threaded connection in the upper end of conversion connector 13, lower clutch 18 fixed connection at the lower extreme of conversion connector 13, a ooff valve is constituteed to case 8 and disk seat 12, and the conical surface on case 8 and the disk seat 12 is mutually supported and is realized the closing of ooff valve.
The outer side of the conversion sleeve 6 is provided with a slideway arranged along the axial direction, the central pipe 2 is provided with a limiting pin 9 corresponding to the slideway, and the end part of the limiting pin 9 is inserted into the slideway so as to limit the axial stroke of the conversion sleeve 6.
The control sliding sleeve 7 is fixedly connected to the inner side of the conversion sleeve 6 through a control sliding sleeve pin 16 arranged on the conversion sleeve 6.
The conversion sleeve 6 is provided with a locking block 15, and the locking block 15 is arranged in a through hole on the side wall of the conversion sleeve 6 and can slide along the radial direction under the pushing of the inner and outer parts.
The ball 5 is placed at the upper end of the control sliding sleeve 7, and the limiting rod 14 is connected to the inner side of the control sliding sleeve 7 through the control pin 10 fixed on the control sliding sleeve 7.
The lower end of the conversion sleeve 6 is provided with a lock spring 20, the lock spring 20 is fixed by a lock spring fixing sleeve 19, and the lower end of the limiting rod 14 is provided with a ring groove 21 matched with the lock spring 20.
The central pipe 2, the conversion sleeve 6 and the control sliding sleeve 7 are all provided with a liquid passing hole 23, the conversion connecting body 13 is internally provided with a liquid passing channel 22, and the liquid passing channel 22 is internally provided with a one-way valve 17.
The outer side of the valve seat 12 is provided with a valve seat sheath 11, the gap between the valve seat sheath 11 and the valve core 8 is controlled within a reasonable range, and the problem that the valve core 8 is not closed tightly due to the fact that the valve core 8 is clamped by underground sand can be effectively solved.
An adjusting ring 3 is arranged between the upper joint 1 and the spring 4, the adjusting ring 3 is sleeved on the outer side of the central tube 2, and the upper end of the adjusting ring 3 is connected to the upper joint 1 through threads. The valve opening pressure of the valve core 8 can be adjusted through the adjusting ring 3 so as to be precisely adapted to the underground working conditions and the use working conditions of other underground tools.
The working process of the invention is as follows:
1. when the skewers are checked:
when the string is tested, the packer 27 works through hydraulic pressure, the packer is pressed from a ground oil pipe, the valve core 8 is pushed up by pressure through the central pipe 2 on the conversion device 26, the control sliding sleeve 7 and the liquid passing hole 23 on the conversion sleeve 6, liquid passes through the space between the valve core 8 and the valve seat 12 under the action of pressure and enters a well section below the packer 27 through a sleeve annulus, and on the ground, a worker can determine whether the water plugging interlayer is in string layers or not according to the change of the pressure of a well mouth, find the non-string interlayer and finish the string testing process.
2. When water is blocked:
when water is blocked, the water blocking bridge plug 24 works, the water blocking bridge plug 24 is adjusted to be not connected with the interlayer, the ball 5 is thrown from the ground and is pressed, the ball 5 sits on the control sliding sleeve 7 and blocks the upper end of the control sliding sleeve 7, the ball 5 and the control sliding sleeve 7 move downwards under the action of pressure and simultaneously cut off the control sliding sleeve pin 16, the control sliding sleeve 7 moves downwards to the diameter-variable position to enable the lock block 15 to move transversely outwards, the control sliding sleeve 7 pushes the lock block 15 to drive the conversion sleeve 6 to move downwards to the diameter-variable position in the conversion connecting body 13, the lock block 15 moves transversely outwards to the diameter-variable position in the conversion connecting body 13 under the pushing of the control sliding sleeve 7, the ball 5 pushes the control sliding sleeve 7, the control pin 10 and the limiting rod 14 to drive the lock block 15 and the conversion sleeve 6 to continuously move downwards to the upper end of the diameter-variable position of the outer sleeve of the conversion sleeve 6 to be collided with the limiting pin 9, at the time, the conversion sleeve 6 closes a channel between the valve core 8 and the valve seat 12, opens a channel below the conversion device 26, the conversion device continues to be pressed, pressure passes through the liquid passing hole 23 on the diameter-variable position in the conversion connecting body 13 and is transmitted to the water blocking bridge plug 24 to enable the water blocking bridge plug 24 to work to complete the water blocking process of water blocking process.
After the water plugging process is finished, the releasing sub 25 is released by pressing the ground (namely, the pipe column is broken into an upper section and a lower section from the releasing sub 25).
3. When the seal is tested:
when the seal is tested, a channel in a tube of the water plugging and seal testing conversion device is closed, a channel between the valve core 8 and the valve seat 12 is opened again to verify the work of a plugging interlayer of a water plugging bridge plug 24, the ground sleeve is pressed, the pressure acts on the limiting rod 14 and the lock spring fixing sleeve 19, the lock spring fixing sleeve 19 is connected with the conversion sleeve 6, the limiting rod 14 and the lock spring fixing sleeve 19 control the sliding sleeve 7 and the conversion sleeve 6 to drive the control sliding sleeve 7 and the ball 5 to move upwards simultaneously until the lower end of the reducing part of the outer sleeve of the conversion sleeve 6 collides with the limiting pin 9, the conversion sleeve 6 opens the channel between the valve core 8 and the valve seat 12 at the moment, the limiting rod 14 drives the control sliding sleeve 7 and the ball 5 to move upwards under the control of the control pin 10, the control sliding sleeve 7 moves upwards to enable the locking block 15 to move inwards transversely until the conversion sleeve 6 and the control sliding sleeve 7 are relatively immobile, the control pin 10 moves upwards to push the ball 5 away from the control sliding sleeve 7 under the control action of the pressure, a groove at the lower end of the limiting rod 14 is locked with the lock spring 20 in the lock spring fixing sleeve 19, the water plugging and the water plugging bridge plug conversion device is closed, the annular pressure testing conversion device is verified, the annular channel 23, the annular pressure of the control sliding sleeve 7 and the annular plug 24, the annular pressure of the annular plug 23, the annular conversion sleeve 23, the annular pressure of the annular plug 24 and the annular plug is verified, and the annular plug, and the annular pressure of the annular plug is verified, and the annular plug is verified, and the annular plug.
The invention improves the prior art, particularly designs the conversion device 26 in research and development, controls the conversion device 26 to act by pressing the oil pipe and the oil sleeve space, and can enable the process pipe column to sequentially meet the process conditions required by string inspection, water plugging and seal inspection, so that three times of independent operations of the three processes of string inspection, water plugging and seal inspection are changed into one operation, and six times of operation pipe columns are changed into two times of operation pipe columns, thereby greatly shortening the construction period, reducing the construction cost, reducing the environmental pollution and reducing the construction difficulty.
Claims (3)
1. A test string, water shutoff, test three-in-one technology tubular column for among oil production which characterized in that: the packer comprises a packer (27), a conversion device (26), a releasing tool (25) and a water plugging bridge plug (24), wherein the packer, the conversion device, the releasing tool and the water plugging bridge plug are connected in series sequentially through oil pipes from top to bottom;
the conversion device (26) comprises an upper joint (1), a central pipe (2), a spring (4), a ball (5), a conversion sleeve (6), a control sliding sleeve (7), a valve core (8), a valve seat (12), a conversion connecting body (13), a limiting rod (14) and a lower joint (18), wherein the upper joint (1) is fixedly connected with the upper end of the central pipe (2), the conversion connecting body (13) is fixedly connected with the lower end of the central pipe (2), the spring (4), the valve core (8) and the valve seat (12) are sleeved on the outer side of the central pipe (2), the valve seat (12) is connected with the upper end of the conversion connecting body (13) through threads, the lower joint (18) is fixedly connected with the lower end of the conversion connecting body (13), a slide way which is arranged along the axial direction is arranged on the outer side of the conversion sleeve (6), the central pipe (2) is correspondingly provided with the limiting pin (9), the end part of the limiting pin (9) is inserted into the slide way so as to limit the axial stroke of the conversion sleeve (6), the control sliding sleeve (7) is connected with a locking block (15) arranged on the fixed pin sleeve (6) on the conversion sleeve (6) through a control pin (6) arranged on the conversion sleeve (6), and can be along radial sliding under the promotion of inside and outside part, ball (5) place the upper end at control sliding sleeve (7), gag lever post (14) through fixing control round pin (10) on control sliding sleeve (7) the inboard at control sliding sleeve (7), the lower extreme of conversion cover (6) be provided with lock spring (20), lock spring (20) are fixed through lock spring fixed cover (19), the lower extreme of gag lever post (14) be provided with lock spring (20) assorted annular (21), center tube (2), conversion cover (6) and control sliding sleeve (7) on all be provided with liquid hole (23), conversion connector (13) in be provided with liquid passageway (22), be provided with check valve (17) in liquid passageway (22).
2. The three-in-one process pipe column for string inspection, water shutoff and seal inspection in petroleum production as claimed in claim 1, which is characterized in that: and a valve seat sheath (11) is arranged on the outer side of the valve seat (12).
3. The three-in-one process pipe column for string inspection, water shutoff and seal inspection in petroleum production as claimed in claim 1, which is characterized in that: the adjustable pipe is characterized in that an adjusting ring (3) is arranged between the upper joint (1) and the spring (4), the adjusting ring (3) is sleeved on the outer side of the central pipe (2), and the upper end of the adjusting ring (3) is connected to the upper joint (1) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710403907.6A CN107100587B (en) | 2017-06-01 | 2017-06-01 | Three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710403907.6A CN107100587B (en) | 2017-06-01 | 2017-06-01 | Three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107100587A CN107100587A (en) | 2017-08-29 |
| CN107100587B true CN107100587B (en) | 2023-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710403907.6A Active CN107100587B (en) | 2017-06-01 | 2017-06-01 | Three-in-one process pipe column for string inspection, water plugging and seal inspection in petroleum production |
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| Country | Link |
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| CN (1) | CN107100587B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943164B (en) * | 2021-03-17 | 2021-10-15 | 大庆市天德忠石油科技有限公司 | String-testing, water-plugging and seal-testing process pipe column |
| CN112983331B (en) * | 2021-03-24 | 2021-12-07 | 大庆市天德忠石油科技有限公司 | Hydraulic double-gate plate well plugging device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2856407Y (en) * | 2005-05-31 | 2007-01-10 | 中国石油天然气股份有限公司 | Perforating and fracturing string of horizontal well |
| CN201507268U (en) * | 2009-08-28 | 2010-06-16 | 中国石油化工股份有限公司 | Step-by-step sealing detecting device |
| EP2216500A2 (en) * | 2009-02-09 | 2010-08-11 | Halliburton Energy Services, Inc. | Hydraulic lockout device for pressure controlled well tools |
| CN102808594A (en) * | 2012-08-17 | 2012-12-05 | 中国海洋石油总公司 | Device and method for multi-stage layering sand prevention and well completion by one-step pipe column |
| CN204212709U (en) * | 2014-10-16 | 2015-03-18 | 中国石油天然气股份有限公司 | Can test mechanical plugging technology tubing string |
| CN104989316A (en) * | 2015-06-26 | 2015-10-21 | 中国石油天然气股份有限公司 | Integrated horizontal well water location and shutoff pipe column |
| CN204899837U (en) * | 2015-09-17 | 2015-12-23 | 大庆市天德忠石油科技有限公司 | Step -by -step releasable packer |
| CN206737884U (en) * | 2017-06-01 | 2017-12-12 | 大庆市天德忠石油科技有限公司 | For the channeling test of cement sheath in Petroleum Production, water blockoff, test inside back cover unification process pipe string |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3412806A (en) * | 1965-07-14 | 1968-11-26 | Otis Eng Co | Multiple safety valve installation for wells |
| CN104975820B (en) * | 2015-06-25 | 2017-07-11 | 荆州市赛瑞能源技术有限公司 | It is a kind of to test envelope anchor packer certainly |
-
2017
- 2017-06-01 CN CN201710403907.6A patent/CN107100587B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2856407Y (en) * | 2005-05-31 | 2007-01-10 | 中国石油天然气股份有限公司 | Perforating and fracturing string of horizontal well |
| EP2216500A2 (en) * | 2009-02-09 | 2010-08-11 | Halliburton Energy Services, Inc. | Hydraulic lockout device for pressure controlled well tools |
| CN201507268U (en) * | 2009-08-28 | 2010-06-16 | 中国石油化工股份有限公司 | Step-by-step sealing detecting device |
| CN102808594A (en) * | 2012-08-17 | 2012-12-05 | 中国海洋石油总公司 | Device and method for multi-stage layering sand prevention and well completion by one-step pipe column |
| CN204212709U (en) * | 2014-10-16 | 2015-03-18 | 中国石油天然气股份有限公司 | Can test mechanical plugging technology tubing string |
| CN104989316A (en) * | 2015-06-26 | 2015-10-21 | 中国石油天然气股份有限公司 | Integrated horizontal well water location and shutoff pipe column |
| CN204899837U (en) * | 2015-09-17 | 2015-12-23 | 大庆市天德忠石油科技有限公司 | Step -by -step releasable packer |
| CN206737884U (en) * | 2017-06-01 | 2017-12-12 | 大庆市天德忠石油科技有限公司 | For the channeling test of cement sheath in Petroleum Production, water blockoff, test inside back cover unification process pipe string |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型注水泥工艺管柱在套保油田的应用;陈宁等;《石油钻采工艺》;20050225(第01期);全文 * |
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| CN107100587A (en) | 2017-08-29 |
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