WO2022086310A1 - Wellbore cleaning device - Google Patents
Wellbore cleaning device Download PDFInfo
- Publication number
- WO2022086310A1 WO2022086310A1 PCT/KZ2020/000024 KZ2020000024W WO2022086310A1 WO 2022086310 A1 WO2022086310 A1 WO 2022086310A1 KZ 2020000024 W KZ2020000024 W KZ 2020000024W WO 2022086310 A1 WO2022086310 A1 WO 2022086310A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casing
- cleaning
- valve
- efficiency
- hammer
- Prior art date
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 abstract description 8
- 239000003129 oil well Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 241000566515 Nedra Species 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
Definitions
- the invention relates to the oil and gas industry, in particular to underground repair and renewal operations at oil wells.
- the main disadvantage of this device is the absence of brashes for mechanical cleaning and the absence of impulse action.
- the technical problem of the invention is the treatment of the casing surface with the mud-pulse forces of fluid and achieving an increase in the efficiency of cleaning the inline build-up.
- the device is equipped with a valve actuating gear, which consists of a valve with a retaining washer with a cotter pin and a spring located inside, a hammer with notches for O-rings, and a tray fixed with a retaining ring; the device for generating mud-pulses is made in the form of a hydraulic impulse generator.
- a valve actuating gear which consists of a valve with a retaining washer with a cotter pin and a spring located inside, a hammer with notches for O-rings, and a tray fixed with a retaining ring;
- the device for generating mud-pulses is made in the form of a hydraulic impulse generator.
- the technical result of the in vention is the improvement of the efficiency of cleaning the botom-hole area from scale build-up.
- the invention is clarified with graphical appendices, where the bottom-hole cleaning device is presented in FIG. 1.
- the de vice consists of an adapter 1 with brashes 2 and a casing 3.
- the adapter has a slot for tightening with an O-ring, staggered brushes of stainless steel (in the form of a line) on the outer surface of the 7 th level adapter, and is connected to the casing of the hydraulic impulse generator 3 with a retaining ring that is installed in the inner groove of the casing. Brushes can be bolted to the pipe surface.
- the cylindrical casing has 4 rows of 6 holes each for fluid outlet. Inside the casing of the hydraulic impulse generator, there are: a valve 4, a spring 5, a cylinder assembly 6, a hammer 7, and a tray 8.
- the valve consists of a thrust ring, a spring-loaded washer, a spring, and a coter pin that fixes the washer.
- the hammer which has a hollow body below the valve, has three lip rings. The hammer has 4 grooves 10 mm thick at the bottom that pass fluid into the bottom row of holes, The tray 8 is installed into the casing from below and fixed with a retaining ring.
- the treatment of the botom-hole area of oil wells is performed using the device in the sequence described below.
- the device is lowered and the surface is cleaned with brushes.
- a chemical solution, a scale inhibitor selected according to the composition of formation water (hereinafter referred to as fluid) flows through the drill pipes into the adapter and then flows on the spring-loaded valve, which temporarily closes the flushing channel, where the fluid pressure pushes the valve down.
- the working fluid flows around the valve and enters the inner cavity of the hammer through the lower triangular groove of the valve .
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention relates to the oil and gas industry, in particular to underground repair and renewal operations at oil wells. The treatment of the casing surface with the mud-pulse forces of fluid and increasing in the efficiency of cleaning the inline build-up is achieved due to the fact that the device is equipped with a valve mechanism, which consists of a valve with a retaining washer with a cotter pin and a spring located inside, a hammer with notches for O-rings, and a tray fixed with a retaining ring; the device for generating mud-pulses is made in the form of a hydraulic impulse generator. Using the proposed method when solving the technical problem posed increases the efficiency of cleaning the bottom-hole area from scaling.
Description
WELLBORE CLEANING DEVICE
The invention relates to the oil and gas industry, in particular to underground repair and renewal operations at oil wells.
There is a device [Gadiev S.M. Using vibration in oil production. Moscow; Nedra, 1977, p.117-120] for cleaning botom-hole area of a production well, comprising a casing with a sleeve to connect the tubing placed in the production well, at least one source of vibrations located in the casing.
The main disadvantage of this device is the absence of brashes for mechanical cleaning and the absence of impulse action.
The technical problem of the invention is the treatment of the casing surface with the mud-pulse forces of fluid and achieving an increase in the efficiency of cleaning the inline build-up.
The technical problem is solved due to the fact that the device is equipped with a valve actuating gear, which consists of a valve with a retaining washer with a cotter pin and a spring located inside, a hammer with notches for O-rings, and a tray fixed with a retaining ring; the device for generating mud-pulses is made in the form of a hydraulic impulse generator.
The technical result of the in vention is the improvement of the efficiency of cleaning the botom-hole area from scale build-up.
The invention is clarified with graphical appendices, where the bottom-hole cleaning device is presented in FIG. 1.
The de vice consists of an adapter 1 with brashes 2 and a casing 3. The adapter has a slot for tightening with an O-ring, staggered brushes of stainless steel (in the form of a line) on the outer surface of the 7th level adapter, and is connected to the casing of the hydraulic impulse generator 3 with a retaining ring that is installed in the inner groove of the casing. Brushes can be bolted to the pipe surface. The cylindrical casing has 4 rows of 6 holes each for fluid outlet. Inside the casing of the
hydraulic impulse generator, there are: a valve 4, a spring 5, a cylinder assembly 6, a hammer 7, and a tray 8. The valve consists of a thrust ring, a spring-loaded washer, a spring, and a coter pin that fixes the washer. The hammer, which has a hollow body below the valve, has three lip rings. The hammer has 4 grooves 10 mm thick at the bottom that pass fluid into the bottom row of holes, The tray 8 is installed into the casing from below and fixed with a retaining ring.
The treatment of the botom-hole area of oil wells is performed using the device in the sequence described below. First, the device is lowered and the surface is cleaned with brushes. Further, a chemical solution, a scale inhibitor selected according to the composition of formation water (hereinafter referred to as fluid) flows through the drill pipes into the adapter and then flows on the spring-loaded valve, which temporarily closes the flushing channel, where the fluid pressure pushes the valve down. The working fluid flows around the valve and enters the inner cavity of the hammer through the lower triangular groove of the valve . Under pressure, the fluid flow enters the lower row of side channels through the lower grooves of the hammer and leaves the hydraulic impulse generator, reducing the pressure inside the casing, Due to the low pressure inside the casing, the spring- loaded valve closes the adapter flushing channel, the pressure rises and the cycle repeats. This leads to the occurrence of oscillation, resonance phenomena, and water hammer.
Initial tests were carried out at the drilling site “South Karamurun”, where positive results were obtained. The device was installed on the well development unit “UOS” and introduced into production.
In 16 problematic wells, in which an unstable rate of recovery was observed, a submersible hydraulic impulse generator was used. As a result, due to its use, the rate of recovery of the wells was increased approximately to 27 m3/h, in addition, the time for using special-purpose machinery was reduced approximately to 3 hours, and the time for flushing and completion was as little as up to 36 hours.
Further, the work on testing and implementation was continued at the drilling site “Tortkuduk”, the results were positive, they are shown in Table 2.
In 10 wells, where there was an unstable rate of recovery, with the help of a hydraulic impulse generator, the rate of recovery was increased with a maximum rate of 37 m3/h, the time for using special-purpose machinery was reduced to 3 hours, and the time for flushing and completion was as little as up to 16 hours.
Claims
PATENT CLAIM
A device for treating bottom-hole area of a production well, comprising a casing with a sleeve to connect the tubing placed in the production well, at least onesource of vibrations located in the casing, characterized in that the adapter (sleeve) has staggered brushes for mechanical cleaning, there is a spring-loaded valve and a striker in the casing, which is hollow and has grooves at the bottom with holes pointing outward.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KZ20200735 | 2020-10-23 | ||
KZ2020/0735.1 | 2020-10-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022086310A1 true WO2022086310A1 (en) | 2022-04-28 |
Family
ID=74666764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KZ2020/000024 WO2022086310A1 (en) | 2020-10-23 | 2020-11-13 | Wellbore cleaning device |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2022086310A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6237701B1 (en) * | 1997-11-17 | 2001-05-29 | Tempress Technologies, Inc. | Impulsive suction pulse generator for borehole |
US7139219B2 (en) * | 2004-02-12 | 2006-11-21 | Tempress Technologies, Inc. | Hydraulic impulse generator and frequency sweep mechanism for borehole applications |
CN105156070A (en) * | 2015-10-19 | 2015-12-16 | 中国石油化工股份有限公司 | Oil pipe descaling scraper cleaning system |
US9222336B2 (en) * | 2009-04-14 | 2015-12-29 | Well Grounded Energy, LLC | Devices, systems and methods relating to down hole operations |
US10458204B2 (en) * | 2014-04-17 | 2019-10-29 | Churchill Drilling Tools Limited | Downhole tool |
-
2020
- 2020-11-13 WO PCT/KZ2020/000024 patent/WO2022086310A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6237701B1 (en) * | 1997-11-17 | 2001-05-29 | Tempress Technologies, Inc. | Impulsive suction pulse generator for borehole |
US7139219B2 (en) * | 2004-02-12 | 2006-11-21 | Tempress Technologies, Inc. | Hydraulic impulse generator and frequency sweep mechanism for borehole applications |
US9222336B2 (en) * | 2009-04-14 | 2015-12-29 | Well Grounded Energy, LLC | Devices, systems and methods relating to down hole operations |
US10458204B2 (en) * | 2014-04-17 | 2019-10-29 | Churchill Drilling Tools Limited | Downhole tool |
CN105156070A (en) * | 2015-10-19 | 2015-12-16 | 中国石油化工股份有限公司 | Oil pipe descaling scraper cleaning system |
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