CN110847875A - Short-time throttling pipe column and short-time throttling method - Google Patents
Short-time throttling pipe column and short-time throttling method Download PDFInfo
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- CN110847875A CN110847875A CN201911132588.5A CN201911132588A CN110847875A CN 110847875 A CN110847875 A CN 110847875A CN 201911132588 A CN201911132588 A CN 201911132588A CN 110847875 A CN110847875 A CN 110847875A
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- ball
- packer
- soluble
- soluble ball
- throttling
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Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 36
- 239000004576 sand Substances 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 23
- 238000010276 construction Methods 0.000 claims description 7
- 230000003628 erosive effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 210000000664 rectum Anatomy 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
Images
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
- E21B23/10—Tools specially adapted therefor
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a short-time throttling pipe column and a short-time throttling method. Through the through-hole of soluble ball, when realizing metal seal between soluble ball and ball seat, still remain certain liquid passageway of crossing for can form sufficient throttle pressure differential under little discharge capacity, let go up the packer setting, wait until increasing discharge capacity after soluble ball dissolve, the latus rectum of ball seat self shrink just can provide sufficient throttle pressure differential and set up the packer, realize that little discharge capacity sets up the packer, big discharge capacity pump notes fracture.
Description
Technical Field
The invention relates to the field of oil-gas well layered fracturing, in particular to a short-time throttling pipe column and a short-time throttling method.
Background
During the layered fracturing construction of an oil and gas well, liquid is pumped in an oil pipe before fracturing, a packer is set through throttling pressure difference generated by a minimum flow passage of a tool in the oil pipe, and the size of the minimum flow passage of the tool directly relates to the setting displacement of the packer and the allowable construction displacement. The smaller the flow passage is, the smaller the packer setting displacement is, and the allowable construction displacement is also reduced correspondingly. The larger the flow passage is, the larger the packer setting displacement is, and the allowable construction displacement is correspondingly increased. When the setting displacement of the packer is too large, the instantaneous pressure of setting rises suddenly, and damage is caused to fracturing equipment and tools.
Disclosure of Invention
The invention aims to provide a short-time throttling pipe column and a short-time throttling method so as to realize small-displacement setting and large-displacement fracturing.
The invention aims to realize the short-time throttling pipe column by the following technical means, and the short-time throttling pipe column comprises a pipe column, wherein a ball seat is connected in the pipe column, a sand blaster is connected on the pipe column below the ball seat, an upper packer is connected outside the pipe column above the ball seat, a lower packer is connected outside the pipe column below the sand blaster, a soluble ball is placed in the ball seat, a plurality of through holes are formed in the soluble ball, and the central lines of the through holes are intersected in the spherical center of the soluble ball.
Further, the upper packer is an expansion packer which is started by means of throttling pressure difference.
Further, the lower packer is a mechanically-set compression packer.
Furthermore, the diameter of the soluble ball is larger than the drift diameter of the ball seat, and the sum of equivalent liquid passing levels of all through holes on the soluble ball is smaller than the equivalent liquid passing level of the ball seat.
Furthermore, the through holes are uniformly distributed along the xyz axis of the spatial rectangular coordinate system, the spatial rectangular coordinate system uses the sphere center of the soluble ball as the origin, and the number of the through holes on each coordinate plane is equal and is not less than one.
A short-time throttling soluble ball short-time throttling method comprises the following steps:
the method comprises the following steps that firstly, a soluble ball is thrown into the packer, the packer is mechanically set, then the soluble ball is thrown into an oil pipe, the soluble ball is pumped by a front liquid pump on the ground and is located in a ball seat, at the moment, metal sealing is formed between the soluble ball and the ball seat, at the moment, a certain liquid passing channel is still reserved after the soluble ball is set through a through hole, and the soluble ball reaches the packer under the condition of small displacement;
secondly, setting an upper packer, injecting a pad fluid, wherein the injected pad fluid generates throttling pressure difference at the soluble ball because the through hole of the soluble ball shrinks through the liquid level, and setting the upper packer when the throttling pressure difference reaches a certain value;
and thirdly, lifting the displacement and sand fracturing, starting to lift the displacement of the pad fluid and sand fracturing, quickly dissolving the soluble ball under the dual actions of dissolving the pad fluid and eroding the sand fracturing, and losing the throttling action of the soluble ball, wherein the displacement of the pad fluid is lifted at the moment, and the through diameter contracted at the ball seat forms enough throttling pressure difference to enable the upper packer to continuously keep the setting state, and the sand is sprayed out of the sand sprayer, so that the setting under small displacement and the fracturing construction under large displacement are finally realized.
The invention has the beneficial effects that: 1. through the through-hole of soluble ball, when realizing metal seal between soluble ball and ball seat, still remain certain liquid passageway of crossing for can form sufficient throttle pressure differential under little discharge capacity, let go up the packer setting, wait until increasing discharge capacity after soluble ball dissolve, the latus rectum of ball seat self shrink just can provide sufficient throttle pressure differential and set up the packer, realize that little discharge capacity sets up the packer, big discharge capacity pump notes fracture.
2. The discharge capacity is little when setting, has reduced equipment and liquid loss, and it is safer to set the packer under little discharge capacity simultaneously, has reduced the damage risk of personnel and equipment.
Drawings
FIG. 1 is a schematic diagram of a soluble sphere structure;
FIG. 2 is a schematic view of a short-time throttle column structure;
FIG. 1, soluble ball; 2. a through hole; 3. an upper packer; 4. a lower packer; 6. a pipe string; 7. a ball seat; 8. a sand blaster.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ example 1 ]
As shown in fig. 1 and 2, a short-time throttling pipe column comprises a pipe column 6, wherein a ball seat 7 is connected in the pipe column 6, a sand ejector 8 is connected on the pipe column 6 below the ball seat 7, an upper packer 3 is connected outside the pipe column 6 above the ball seat 7, a lower packer 4 is connected outside the pipe column 6 below the sand ejector 8, a soluble ball 1 is placed in the ball seat 7, a plurality of through holes 2 are formed in the soluble ball 1, and the central lines of the through holes 2 are intersected in the spherical center of the soluble ball 1.
The ball seat 7 that holds soluble ball 1 is connected to 6 in-connections of tubular column to the diameter of the latus rectum in the ball seat 7 is less than the internal diameter of tubular column, and tubular column 6 is from last packer 3, ball seat 7, sand blaster 8 and packer 4 down in proper order down, and the sand blaster, 8 can not produce the throttle effect as the passageway in intercommunication tubular column 6 and the 6 annulars of tubular column.
The soluble ball 1 is dropped from the wellhead and then seated in the ball seat 7, so that a metal seal is formed between the soluble ball 1 and the ball seat 7. The liquid flows down from above the pipe column 6, flows into the drift diameter of the ball seat 7 through the through hole 2 on the soluble ball 1, and then continues to flow downwards.
The upper packer 3 is an expanding packer that is activated by a throttling differential pressure. The upper packer 3 is sealed off by a throttling pressure difference created by the reduction of the liquid level through the soluble ball 1.
The lower packer 4 is a mechanically set compression packer. The lower packer 4 is a normal mechanical setting type packer and can be set by mechanical setting.
The diameter of the soluble ball 1 is larger than the drift diameter of the ball seat 7, and the sum of equivalent liquid passing levels of all the through holes 2 on the soluble ball 1 is smaller than the equivalent liquid passing level of the ball seat 7.
The diameter of the soluble ball 1 is larger than that of the ball seat 7, so that the soluble ball 1 cannot fall along the drift diameter of the ball seat 7, the sum of the liquid passing levels of the through holes 2 is smaller than the equivalent liquid passing level of the ball seat 7, and the throttling pressure difference can be further formed
Through-hole 2 is along the xyz axle evenly distributed of space rectangular coordinate system, and space rectangular coordinate system uses the centre of sphere of soluble ball 1 as the original point, and each plane of coordinate's through-hole 2 equals and is not less than one in quantity.
A space rectangular coordinate system is established by taking the sphere center of the soluble ball 1 as an origin, the through holes 2 are distributed along the x axis, the y axis and the z axis of the space rectangular coordinate system, and the number of the through holes 2 on each coordinate plane is equal and is not less than one.
[ example 2 ]
On the basis of the embodiment 1, as shown in fig. 1 and fig. 2, a short-time throttling soluble ball short-time throttling method comprises the following steps:
firstly, putting a soluble ball into the oil pipe, mechanically setting a lower packer 4, putting the soluble ball 1 into the oil pipe, pumping the soluble ball 1 into a ball seat 7 through a front liquid pump on the ground, forming metal seal between the soluble ball 1 and the ball seat 7 at the moment, and enabling a certain liquid passing channel to be reserved after the soluble ball 1 is set by a through hole 2 at the moment so as to reach an upper packer 3 under the condition of small discharge capacity;
in the first step, the packer 4 is firstly set mechanically, then the soluble ball 1 is thrown into the pipe column 6, the soluble ball 1 is pumped by a front liquid on the ground to be seated in the ball seat 7, metal sealing is formed between the soluble ball 1 and the ball seat 7, at the moment, because the soluble ball 1 is provided with the through hole 2, the liquid can flow downwards from the through hole 2, and a certain liquid passing channel is reserved.
Secondly, setting an upper packer, injecting a pad fluid, wherein the injected pad fluid generates throttling differential pressure at the soluble ball 1 because the through hole 2 of the soluble ball 1 is contracted by passing through the liquid level, and setting the upper packer 3 when the throttling differential pressure reaches a certain value;
the displacement of the prepad fluid is increased, because the overflow surface of the pipe column 6 is large, when the prepad fluid flows to the soluble ball 1, the overflow surface provided by the through hole 2 is reduced, so that throttling differential pressure is generated at the soluble ball 1, and as the displacement is increased, the throttling differential pressure reaches the set value of the upper packer 3, and the upper packer realizes setting. Because the sum of the equivalent excess liquid levels of all the through holes 2 of the soluble ball 1 is small, the large displacement is not needed to provide enough throttling pressure difference.
And thirdly, lifting the displacement and sand fracturing, starting to lift the displacement of the pad fluid and sand fracturing, quickly dissolving the soluble ball 1 under the dual actions of pad fluid dissolution and sand fracturing erosion, and losing the throttling action of the soluble ball 1, wherein the displacement of the pad fluid is lifted at the moment, and a sufficient throttling pressure difference is formed by the contracted drift diameter at the ball seat 3, so that the upper packer 3 is continuously kept in a setting state, sand is sprayed out of the sand sprayer 8, and finally, the setting under small displacement and the fracturing construction under large displacement are realized.
Further, the displacement of the pad fluid is increased, sand fracturing is carried out, under the double effects of dissolving of the pad fluid and sand fracturing erosion, the soluble ball 1 is dissolved, the through fluid channel is changed from the small through hole 2 to the larger drift diameter of the ball seat 7, but the drift diameter of the ball seat 7 is still smaller than the inner diameter of the pipe column 6, throttling differential pressure is still generated at the ball seat 7, although the through fluid channel is enlarged, the displacement is also increased, and the throttling differential pressure generated at the ball seat 7 still keeps the setting of the upper packer 3. And sand flows out of the sand blaster 8.
Finally, because the soluble ball 1 provides the smallest fluid passage, so that enough throttling pressure difference can be generated to set the upper packer 3 at the same time of low displacement, as the displacement is increased, the soluble ball 1 is dissolved, the fluid passage in the pipe is enlarged, but a certain throttling pressure difference is still maintained to set the upper packer 3 due to the increase of the displacement. The small-displacement setting and the large-displacement pump injection fracturing are realized. The loss of equipment and liquid is reduced, and the damage risk of personnel and equipment is reduced.
Claims (6)
1. A short-time throttling pipe column is characterized in that: including tubular column (6), tubular column (6) in-connection has ball seat (7), is connected with sand blaster (8) on tubular column (6) of ball seat (7) below, and tubular column (6) external connection of ball seat (7) top has packer (3), and tubular column (6) external connection of sand blaster (8) below has packer (4) down, has placed soluble ball (1) in ball seat (7), and it has a plurality of through-holes (2) to open on soluble ball (1), the central line of a plurality of through-holes (2) all intersects in soluble ball (1) centre of sphere.
2. The short term choke string as claimed in claim 1, wherein: the upper packer (3) is an expansion packer which is started by the throttling pressure difference.
3. The short term choke string as claimed in claim 1, wherein: the lower packer (4) is a compression packer which is mechanically set.
4. The short term choke string as claimed in claim 1, wherein: the diameter of the soluble ball (1) is larger than the drift diameter of the ball seat (7), and the sum of equivalent liquid passing levels of all the through holes (2) on the soluble ball (1) is smaller than the equivalent liquid passing level of the ball seat (7).
5. The short term choke string as claimed in claim 1, wherein: through-hole (2) are along the xyz axle evenly distributed of space rectangular coordinate system, and space rectangular coordinate system uses the centre of sphere of soluble ball (1) as the original point, and each coordinate plane's through-hole (2) quantity equals and is not less than one.
6. A method for short-time throttling of a soluble ball according to claim 1, characterized in that it comprises the following steps:
firstly, putting a soluble ball into the oil pipe, mechanically setting a lower packer (4), then putting the soluble ball (1) into the oil pipe, pumping the soluble ball (1) to be located in a ball seat (7) through a front liquid pump on the ground, forming metal seal between the soluble ball (1) and the ball seat (7), and enabling the soluble ball (1) to still remain a certain liquid passing channel after being set by a through hole (2) so as to reach an upper packer (3) under a smaller displacement;
secondly, setting an upper packer, injecting a pad fluid, wherein the injected pad fluid generates throttling differential pressure at the soluble ball (1) because the through hole (2) of the soluble ball (1) is contracted by passing through the liquid level, and setting the upper packer (3) when the throttling differential pressure reaches a certain value;
and thirdly, lifting the displacement and sand fracturing, starting to lift the displacement of the pad fluid and sand fracturing, quickly dissolving the soluble ball (1) under the dual actions of pad fluid dissolution and sand fracturing erosion, and making the throttling action of the soluble ball (1) fail, wherein the displacement of the pad fluid is lifted at the moment, and a sufficient throttling pressure difference is formed by the through diameter contracted at the ball seat (3) to keep the upper packer (3) in a setting state continuously, and sand is sprayed out of the sand blaster (8), so that the setting under small displacement and the fracturing construction under large displacement are finally realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132588.5A CN110847875B (en) | 2019-11-19 | 2019-11-19 | Short-time throttling pipe column and short-time throttling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132588.5A CN110847875B (en) | 2019-11-19 | 2019-11-19 | Short-time throttling pipe column and short-time throttling method |
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| Publication Number | Publication Date |
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| CN110847875A true CN110847875A (en) | 2020-02-28 |
| CN110847875B CN110847875B (en) | 2023-12-05 |
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| CN110847875B (en) | 2023-12-05 |
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Effective date of registration: 20201030 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1203 Applicant before: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Applicant before: CHINA NATIONAL PETROLEUM Corp. |
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