CN109577912A - Jet-preventing tool and a formula underbalance combine oil production method in oil pipe under underbalance - Google Patents
Jet-preventing tool and a formula underbalance combine oil production method in oil pipe under underbalance Download PDFInfo
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- CN109577912A CN109577912A CN201811615596.0A CN201811615596A CN109577912A CN 109577912 A CN109577912 A CN 109577912A CN 201811615596 A CN201811615596 A CN 201811615596A CN 109577912 A CN109577912 A CN 109577912A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 24
- 241001062009 Indigofera Species 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 12
- 239000003129 oil well Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 abstract description 4
- 241001074085 Scophthalmus aquosus Species 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000002253 acid Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to completion tubular column technical field of operation under underbalance, it is jet-preventing tool and a formula underbalance joint oil production method in oil pipe under a kind of underbalance, the former includes tube body, level pressure plug, slot oil pipe and salvages blue, it is from top to bottom successively fixedly installed at least one slot oil pipe between bottom of the pipe and the upper end for salvaging indigo plant, liquid channel excessively up and down is distributed in the middle part of tube body and slot oil pipe；After the latter comprises the following steps that (1) completes reservoir drilling well work using Unbalance technique, under-balanced state tripping in screen casing closes brill to predetermined position back seat under screen casing.The present invention can prevent from spraying in oil pipe in oil pipe under underbalance, the lower oil pipe well control safety of effective guarantee, shear pin cutting is set to separate level pressure plug with interior land by suppressing, level pressure plug can be accepted by salvaging indigo plant, it prevents from it from forming subsequent job to interfere, the oil of reservoir can be entered in tube body by slot oil pipe, realized in oil pipe with reservoir connection, can be carried out gaslift under underbalance and go into operation.
Description
Technical field
The present invention relates to completion tubular column technical field of operation under underbalance, be under a kind of underbalance in oil pipe jet-preventing tool and
One time formula underbalance combines oil production method.
Background technique
Currently, when implementing insufficient balance well completion operation, if the case where being fitted without oil pipe blowout tool on oil pipe into
Under row when oil pipe operation, stratum stream will be flow backwards by oil pipe, can slightly make well head operation very inconvenient, severe one will cause well control
It is out of control, serious consequence is caused, if but when implementing insufficient balance well completion using slurry pressure down-hole oil tube again, overall process owes flat
Weighing apparatus just loses meaning, at present traditional integrated Completion Techniques, exist in its technique of Yao Shiying under balance pressure drilling compared with
Big limitation, to guaranteeing preferably release, protection oil-gas Layer and realizing overall process under-balance completion practice, however it remains
The problem of fluid flows backwards generation blowout phenomenon by oil pipe under no killing well in insufficient balance well completion operation.At the same time, it recovers the oil the later period
When needing separate zone production, when carrying out perforation through tubing, acid fracturing, it is also necessary to play flowline, then play oil pipe again, in this way, making
The cumbersome production efficiency of industry process is low.
Summary of the invention
The present invention provides jet-preventing tools in oil pipe under a kind of underbalance and a formula underbalance to combine oil production method, overcomes
The deficiency of the above-mentioned prior art can effectively solve in existing insufficient balance well completion operation fluid under no killing well and pass through oil pipe and flows backwards
There is a phenomenon where the cumbersome production efficiency of work flow low problems when blowout, separate zone production progress perforation through tubing, acid fracturing.
Technical solution of the present invention first is that being realized by following measures: blowout prevention work in oil pipe under a kind of underbalance
Tool, including tube body, level pressure plug, slot oil pipe and salvaging are blue, between bottom of the pipe and the upper end for salvaging indigo plant from top to bottom successively
It is fixedly installed at least one slot oil pipe, liquid channel excessively up and down is distributed in the middle part of tube body and slot oil pipe, is cut
Be distributed with the slot that can be communicated with its inner cavity on seam oil pipe, salvage the salvaging blind way that blue middle part is equipped with opening upwards, tube body it is interior
Wall is equipped with interior land, is equipped with level pressure plug below interior land, the upper end of level pressure plug and the lower end of interior land mutually seal, level pressure
Plug and tube body are linked together by shear pin, set anchor ring equipped with wide at the top and narrow at the bottom on the inside of the upper end of interior land.
Here is further optimization or/and improvement of one of the above technical solutions of the invention:
Above-mentioned level pressure plug may include the upper cover being from top to bottom connected in turn, cylinder and plug, and upper cover is plectane, upper cover
It is set in tube body, the outer diameter of upper cover is greater than the internal diameter of interior land, and the diameter of cylinder is less than the diameter of upper cover, under plug is presented greatly
Small bullet, the diameter of plug upper end and the diameter of cylinder are equal, and the center line of upper cover, cylinder and plug is in same axis
On.
The shear pin that above-mentioned level pressure plug can be uniformly distributed along the circumference with tube body by two to six links together, corresponding every
The pin hole being sleeved on the outside of shear pin is distributed on the cylinder of a shear pin position, corresponding each shear pin position
The through-hole being sleeved on the outside of shear pin is distributed on tube body.
Sealing ring can be fixedly installed between above-mentioned level pressure plug and interior land.
Two groups of slot groups can be from top to bottom intervally distributed on above-mentioned slot oil pipe, between every group of slot group includes multiple etc.
Every the slot of distribution, every group of slot group is twist distributed along slot oil pipe periphery, and the helical angle of every group of slot group is 30 °
To between 45 °.
Above-mentioned salvaging indigo plant may include salvaging casing and guiding connector, salvages casing part and is fixed with guiding connector, guiding connects
Head is in up big and down small hollow cone, and the maximum outside diameter for being oriented to connector is equal with the outer diameter of casing is salvaged, and is oriented to connector most
Large diameter is equal with the internal diameter of casing is salvaged.
The lower outside of above-mentioned tubular body can be connected through a screw thread fixed peace with the upper end inside for the slot oil pipe for being located at top
It is fitted together, by being connected through a screw thread fixed peace on the outside of the upper end blue positioned at the lower end inside of the slot oil pipe of bottom and salvaging
It is fitted together.
The above-mentioned bus for setting anchor ring can be arc-shaped, and setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and be sat
The diameter of blocking is greater than the minimum diameter for setting anchor ring.
Technical solution of the present invention second is that being realized by following measures: it is a kind of using in oil pipe under above-mentioned underbalance
A time formula underbalance of jet-preventing tool combines oil production method, comprises the following steps that
(1) after completing reservoir drilling well work using Unbalance technique, under-balanced state tripping in screen casing, to behind predetermined position under screen casing
Setting trip-out；
(2) pipe string is formed at the lower part that jet-preventing tool is installed on oil pipe in oil pipe under underbalance, transfers and manages in under-balanced state
String, until oil pipe transfers to predetermined position；
(3) setting tubing hanger, setting production tree；
(4) by the shear pin cut under underbalance in oil pipe in jet-preventing tool that builds the pressure, it is blue that level pressure plug falls into salvaging
Interior, the inner cavity of oil pipe will establish communicating passage inside and outside oil pipe by liquid channel and the slot excessively of tube body and slot oil pipe；
(5) selection suitable method is gone into operation, specifically: if reservoir energy reaches self-spray operation condition, direct self-spray oil-producing；If
Reservoir energy is not up to self-spray operation condition, then gaslift induced flow is gone into operation；If gaslift induced flow is not up to self-spray operation condition, lower oil pumping
Pump turns suction and recovers the oil；
(6) it recovers the oil the later period, when needing to carry out separate zone production, it is only necessary to act sucker rod and oil well pump, put into and build the pressure into pipe string
Ball, the ball that makes to build the pressure are set in setting at anchor ring, complete the closure to tube body below anchor ring is set, and are closed under underbalance and are prevented in oil pipe
Spray tool；
(7) perforation through tubing operation and fracturing reform operation are carried out under under-balanced state；
(8) gas lift liquid drainage, lower oil well pump and sucker rod are carried out, pumping oil producing operation is restored.
Structure of the invention is reasonable and compact, easy to use, under underbalance in oil pipe jet-preventing tool by level pressure plug with it is interior
Land mutually seals, and so that level pressure plug is linked together with tube body by shear pin, can prevent oil in oil pipe under underbalance
Spray in pipe, the lower oil pipe well control safety of effective guarantee make shear pin cutting that can make level pressure plug and interior land point by suppressing
It leaves, level pressure plug can be accepted by salvaging indigo plant, prevented it from being formed to subsequent job and interfered, the oil of reservoir can be entered by slot oil pipe
In tube body, realizes in oil pipe with reservoir connection, gaslift under underbalance can be carried out and gone into operation, can be sealed by putting into setting ball in pipe string
The stifled inner hole for setting anchor ring, makes the lower part of jet-preventing tool in oil pipe under underbalance be in sealing state, can carry out perforation through tubing,
Operation is transformed in acid fracturing, can complete multinomial joint oil recovery under under-balanced state using jet-preventing tool in oil pipe under underbalance and make
Industry realizes that oil pipe blowout, gaslift operation, perforation through tubing, acid fracturing one-trip string fulfil assignment under underbalance, effectively will be numerous
Trivial operation operation simplifies, and simplifies operation technological process, shortens duty cycle, improves operating efficiency, have it is easy to operate, it is time saving
It is laborsaving, convenient and efficient, the high feature of overall process under-balance completion practice success rate.
Detailed description of the invention
Attached drawing 1 is schematic diagram of main cross-sectional structure of the embodiment of the present invention one.
Attached drawing 2 is the flow chart of the embodiment of the present invention two.
Coding in attached drawing is respectively as follows: 1 for tube body, and 2 be steel ball, and 4 be shear pin, and 5 be sealing ring, and 6 be slot oil pipe,
7 is blue to salvage, and 8 be inner convex platform, and 9 is set anchor ring, and 10 be slot, and 11 be upper cover, and 12 be cylinder, and 13 be plug, and 14 be to salvage
Casing, 15 be guiding connector, and 16 be pin hole, and 17 be through-hole.
Specific embodiment
The present invention is not limited by the following examples, can determine according to the technique and scheme of the present invention with actual conditions specific
Embodiment.
In the present invention, for ease of description, the description of the relative positional relationship of each component is according to Figure of description 1
Butut mode be described, such as: front, rear, top, and bottom, left and right positional relationship be the Butut according to Figure of description
Direction determines.
Below with reference to examples and drawings, the invention will be further described:
As shown in Fig. 1, jet-preventing tool includes tube body 1, level pressure plug, slot oil pipe 6 and salvages indigo plant in oil pipe under the underbalance,
It 1 lower end of tube body and salvages and is from top to bottom successively fixedly installed at least one slot oil pipe 6 between blue upper end, tube body 1 and cut
The middle part of seam oil pipe 6 is distributed with liquid channel excessively up and down, and the slot that can be communicated with its inner cavity is distributed on slot oil pipe 6
10, the salvaging blind way that blue middle part is equipped with opening upwards is salvaged, the inner wall of tube body 1 is equipped with interior land 8, is equipped with below interior land 8
Level pressure plug, the upper end of level pressure plug and the lower end of interior land 8 mutually seal, and level pressure plug is connect with tube body 1 by shear pin 4
Together, anchor ring 9 is set equipped with wide at the top and narrow at the bottom on the inside of the upper end of interior land 8.According to demand, when slot oil pipe 6 is multiple,
Every two adjacent slot oil pipes 6 can be fixedly installed togather or are fixedly installed togather by connecting short section.In use process,
It before entering well, first has to carry out pressure testing and Leakage Test to the present embodiment, well can be entered after ensuring qualification, can incite somebody to action later
1 upper end of tube body and conventionally known oil pipe are joined together to form pipe string, then can be by the predeterminated position of pipe string G.I.H, this
In the process, level pressure plug is connect with tube body 1 by shear pin 4, and makes level pressure plug and interior land 8 in sealing state, can be prevented
Only there is spray in oil pipe, oil pipe well control safety under effective guarantee；After arriving predetermined well depth under oil pipe, shear pin can be made by suppressing
Nail 4 is cut, and level pressure plug will separate with interior land 8 and pass through liquid channel and fall into salvaging blind way at this time, and the oil of reservoir will lead to
It crosses slot 10 and entered liquid channel, realize in oil pipe with reservoir connection, gaslift operation operation can be carried out；Recovering the oil, the later period was carried out
It when oil pipe perforation, acid fracturing, does not need to play flowline again, only oil well pump need to be played out, by putting into setting ball in oil pipe
2, make setting ball 2 and set the sealing of anchor ring 9,1 lower part of tube body can be closed by setting ball 2, can set above anchor ring 9 at this time
Pipe string in carry out perforation through tubing, acid fracturing operation.The present embodiment reasonable and compact in structure, it is easy to use, by fixed
Pressure plug is sealed with interior 8 phase of land, and so that level pressure plug is linked together with tube body 1 by shear pin 4, can be under underbalance
Prevent spray in oil pipe in oil pipe, the lower oil pipe well control safety of effective guarantee makes the cutting of shear pin 4 that level pressure can be made stifled by suppressing
Head is separated with interior land 8, and level pressure plug can be accepted by salvaging indigo plant, is prevented it from being formed to subsequent job and is interfered, the oil of reservoir can lead to
It crosses slot oil pipe to enter in tube body 1, realizes in oil pipe with reservoir connection, gaslift under underbalance can be carried out and gone into operation, by pipe string
Middle investment setting ball 2 can block the inner hole for setting anchor ring 9, so that the lower part of the present embodiment is in sealing state, can carry out oil pipe
Operation is transformed in perforation, acid fracturing, and the present embodiment can realize oil pipe blowout under underbalance, gaslift operation, perforation through tubing, acidification
Pressure break one-trip string fulfils assignment, and effectively simplifies cumbersome operation operation, shortens duty cycle, improves operating efficiency, has
Safe, laborsaving, easy, efficient feature.According to demand, length of the tube body 1 from upper surface to lower end surface is 500mm, is salvaged blue
The length of upper surface to lower end surface is 300mm.The diameter of tube body 1 has tri- kinds of φ 73mm, φ 89mm, φ 114mm specifications.This implementation
The button-type of example is executed fully according to API standard, and rated insulation voltage value is 35 MPa and two kinds of 70MPa, the length of slot oil pipe 6
It can be adjusted according to the thickness of reservoir.
Jet-preventing tool in oil pipe under above-mentioned underbalance can be made further optimization and/or improvements according to actual needs:
As shown in Fig. 1, level pressure plug includes the upper cover 11 being from top to bottom connected in turn, cylinder 12 and plug 13, on
Lid 11 is plectane, and upper cover 11 is set in tube body 1, and the outer diameter of upper cover 11 is greater than the internal diameter of interior land 8, and the diameter of cylinder 12 is less than
The diameter of upper cover 11, plug 13 are in up big and down small bullet, and the diameter of 13 upper end of plug is equal with the diameter of cylinder 12, upper cover
11, the center line of cylinder 12 and plug 13 is on the same axis.In this way, the plug of tapered body can after the cutting of shear pin 4
Play guiding role, it is ensured that level pressure plug smoothly slides to salvaging basket.
As shown in Fig. 1, level pressure plug is connected to one by two to six shear pins 4 being uniformly distributed along the circumference with tube body 1
It rises, the pin hole 16 for being sleeved on 4 outside of shear pin is distributed on the cylinder 12 of corresponding each 4 position of shear pin, it is corresponding every
The through-hole 17 for being sleeved on 4 outside of shear pin is distributed on the tube body 1 of a 4 position of shear pin.In this way, level pressure plug can be made
It is connect with tube body 1 more stable, and stress is more evenly.
As shown in Fig. 1, sealing ring 5 is fixedly installed between level pressure plug and interior land 8.In this way, can further be
Reliable leakproofness is provided between level pressure plug and interior land 8.According to demand, conventionally known sealing ring can be used in sealing ring 5
Technology, such as rectangular seal.
As shown in Fig. 1, two groups of slot groups are from top to bottom intervally distributed on slot oil pipe 6, every group of slot group includes
Multiple slots 10 being spacedly distributed, every group of slot group are twist distributed along 6 periphery of slot oil pipe, the spiral shell of every group of slot group
Swing angle is between 30 ° to 45 °.The length and width of slot 10 can be set according to reservoir yield, formation sand production particle size situation
Meter, thus can have good anti-grittiness, so that oil recovery quality can be improved in oil recovery process.
As shown in Fig. 1, salvaging blue includes salvaging casing 14 and guiding connector 15, salvages 14 lower part of casing and is fixed with guiding
Connector 15, guiding connector 15 are in up big and down small hollow cone, are oriented to the maximum outside diameter of connector 15 and salvage the outer of casing 14
Diameter is equal, and the maximum inner diameter for being oriented to connector 15 is equal with the internal diameter of casing 14 is salvaged.Thus it can pass through the shape of guiding connector 15
Guiding role is played to the decentralization of pipe string, the bellmouth by being oriented to connector 15 can play salvaging with the external shape fits of plug 13
The effect of limit.
As shown in Fig. 1, the lower outside of tube body 1 is connected on the inside of the upper end for the slot oil pipe 6 for being located at top by screw thread
It connects and is fixedly installed togather, by passing through screw thread on the outside of the upper end blue positioned at the lower end inside of the slot oil pipe 6 of bottom and salvaging
It is connected and fixed and is installed together.Thus can be connected through a screw thread makes it be easy for installation and removal, and screw thread button-type can be marked according to API
Standard executes.
As shown in Fig. 1, the bus for setting anchor ring 9 is arc-shaped, and setting seat at anchor ring 9 has the seat that can be sealed engagement therewith
Blocking 2, the diameter of setting ball 2 are greater than the minimum diameter for setting anchor ring 9.In use, setting ball 2 should be taken before transferring pipe string
Out, when needing to carry out perforation through tubing, acid fracturing, setting ball 2 can be put into pipe string, and send to setting anchor ring 9 and makes two
Person's sealing, thus can reach the condition of perforation through tubing, acid fracturing operation；By being arc-shaped the bus for setting anchor ring 9
It can make it that there is with setting ball 2 better sealing, make it have and good set effect.According to demand, setting ball 2 can be used
Existing well-known technique, such as steel ball.
Embodiment two: as shown in Fig. 2, an a kind of formula underbalance using jet-preventing tool in oil pipe under above-mentioned underbalance
Joint oil production method, comprises the following steps that
(1) after completing reservoir drilling well work using Unbalance technique, under-balanced state tripping in screen casing, to behind predetermined position under screen casing
Setting trip-out；
(2) pipe string is formed at the lower part that jet-preventing tool is installed on oil pipe in oil pipe under underbalance, transfers and manages in under-balanced state
String, until oil pipe transfers to predetermined position；
(3) setting tubing hanger, setting production tree；
(4) by the shear pin 4 cut under underbalance in oil pipe in jet-preventing tool that builds the pressure, it is blue that level pressure plug falls into salvaging
Interior, the inner cavity of oil pipe will establish communicating passage inside and outside oil pipe by liquid channel and the slot 10 excessively of tube body 1 and slot oil pipe；
(5) selection suitable method is gone into operation, specifically: if reservoir energy reaches self-spray operation condition, direct self-spray oil-producing；If
Reservoir energy is not up to self-spray operation condition, then gaslift induced flow is gone into operation；If gaslift induced flow is not up to self-spray operation condition, lower oil pumping
Pump turns suction and recovers the oil；
(6) it recovers the oil the later period, when needing to carry out separate zone production, it is only necessary to act sucker rod and oil well pump, put into and build the pressure into pipe string
Ball, the ball that makes to build the pressure are set in setting at anchor ring 9, complete the closure to 9 lower section tube body of anchor ring is set, and are closed under underbalance in oil pipe
Jet-preventing tool；
(7) perforation through tubing operation and fracturing reform operation are carried out under under-balanced state；
(8) gas lift liquid drainage, lower oil well pump and sucker rod are carried out, pumping oil producing operation is restored.
Multinomial joint oil producing operation can be completed under under-balanced state using the present embodiment, realize that oil pipe is anti-under underbalance
Spray, gaslift operation, perforation through tubing, acid fracturing one-trip string fulfil assignment, and solve to meet in completion tubular column operation under underbalance
The problem seen above mentions and lower square tube string without repeated multiple times, simplifies operation technological process, have it is easy to operate, it is time saving and energy saving, just
Prompt efficient, the high feature of overall process under-balance completion practice success rate is moved on to, fracturing reform by insufficient balance well completion and downstream
Technology linking, effectively shorten oil/gas well production cycle, reservoir pollution can be minimized, reduce operating cost, accelerate to build
Produce paces；The present embodiment realizes overall process snubbing serving, can protect reservoir to greatest extent；By preventing in oil pipe under underbalance
The setting of spray tool can cut shear pin by the method that builds the pressure, establish oil in under-balanced state after oil pipe is transferred in place
Inside and outside communicating passage is managed, thus can directly carry out gaslift operation, suction is gone into operation；It needs separate zone production in the suction oil recovery later period
When, oil well pump only need to be played out, then jet-preventing tool in oil pipe is closed under underbalance in pitching, and oil can be carried out under no killing well state
Pipe perforation and fracturing reform do not need to carry out well pulling job, reduce duty cycle and cost.
The above technical features constitute embodiments of the present invention, can basis with stronger adaptability and implementation result
Actual needs increases and decreases non-essential technical characteristic, to meet the needs of different situations.
Claims (10)
1. jet-preventing tool in oil pipe under a kind of underbalance, it is characterised in that including tube body, level pressure plug, slot oil pipe and salvaging
Indigo plant, bottom of the pipe and salvages and is from top to bottom successively fixedly installed at least one slot oil pipe between blue upper end, tube body and cuts
It is distributed with liquid channel excessively up and down in the middle part of seam oil pipe, the slot that can be communicated with its inner cavity is distributed on slot oil pipe,
The salvaging blind way that indigo plant middle part is equipped with opening upwards is salvaged, the inner wall of tube body is equipped with interior land, blocks up below interior land equipped with level pressure
Head, the upper end of level pressure plug and the lower end of interior land mutually seal, and level pressure plug and tube body are linked together by shear pin, interior
Anchor ring is set equipped with wide at the top and narrow at the bottom on the inside of the upper end of land.
2. jet-preventing tool in oil pipe under underbalance according to claim 1, it is characterised in that level pressure plug include by up to
Under the upper cover, cylinder and the plug that are connected in turn, upper cover is plectane, and upper cover is set in tube body, and the outer diameter of upper cover is greater than
The internal diameter of interior land, the diameter of cylinder are less than the diameter of upper cover, and plug is in up big and down small bullet, the diameter of plug upper end with
The diameter of cylinder is equal, and the center line of upper cover, cylinder and plug is on the same axis.
3. jet-preventing tool in oil pipe under underbalance according to claim 2, it is characterised in that level pressure plug passes through with tube body
Two to six shear pins being uniformly distributed along the circumference link together, and are distributed with set on the cylinder of corresponding each shear pin position
Pin hole on the outside of shear pin is distributed on the tube body of corresponding each shear pin position and is sleeved on the outside of shear pin
Through-hole.
4. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that level pressure plug with it is interior
Sealing ring is fixedly installed between land.
5. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that on slot oil pipe by
Two groups of slot groups are intervally distributed under, every group of slot group includes multiple slots being spacedly distributed, and every group of slot group is equal
It is twist distributed along slot oil pipe periphery, the helical angle of every group of slot group is between 30 ° to 45 °.
6. jet-preventing tool in oil pipe under underbalance according to claim 1 or 2 or 3, it is characterised in that on slot oil pipe by
Two groups of slot groups are intervally distributed under, every group of slot group includes multiple slots being spacedly distributed, and every group of slot group is equal
It is twist distributed along slot oil pipe periphery, the helical angle of every group of slot group is between 30 ° to 45 °.
7. jet-preventing tool in oil pipe under underbalance described according to claim 1 or 2 or 3 or 6, it is characterised in that salvaging indigo plant includes
Casing and guiding connector to be salvaged, casing part is salvaged and is fixed with guiding connector, guiding connector is in up big and down small hollow cone,
The maximum outside diameter for being oriented to connector is equal with the outer diameter of casing is salvaged, and is oriented to the maximum inner diameter of connector and the internal diameter phase for salvaging casing
Deng.
8. jet-preventing tool in oil pipe under underbalance described according to claim 1 or 2 or 3 or 6, it is characterised in that the lower part of tube body
It is connected through a screw thread and is fixedly installed togather on the inside of outside and the upper end for the slot oil pipe for being located at top, the slot oil positioned at bottom
It is connected through a screw thread and is fixedly installed togather on the outside of the lower end inside of pipe and the upper end for salvaging indigo plant；Or/and set anchor ring
Bus is arc-shaped, and setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and the diameter of setting ball, which is greater than, sets anchor ring
Minimum diameter.
9. jet-preventing tool in oil pipe under underbalance according to claim 7, it is characterised in that the lower outside of tube body and position
It is connected through a screw thread and is fixedly installed togather on the inside of the upper end of the slot oil pipe at top, positioned at the lower end of the slot oil pipe of bottom
It is connected through a screw thread and is fixedly installed togather on the outside of inside and the upper end for salvaging indigo plant；Or/and the bus of anchor ring is set in circle
Arc, setting seat at anchor ring has the setting ball that can be sealed engagement therewith, and the diameter of setting ball is greater than the minimum diameter for setting anchor ring.
10. a kind of using as a formula underbalance of jet-preventing tool combines oil recovery side in oil pipe under underbalance in claim 1 to 9
Method, it is characterised in that comprise the following steps that
(1) after completing reservoir drilling well work using Unbalance technique, under-balanced state tripping in screen casing, to behind predetermined position under screen casing
Setting trip-out；
(2) pipe string is formed at the lower part that jet-preventing tool is installed on oil pipe in oil pipe under underbalance, transfers and manages in under-balanced state
String, until oil pipe transfers to predetermined position；
(3) setting tubing hanger, setting production tree；
(4) by the shear pin cut under underbalance in oil pipe in jet-preventing tool that builds the pressure, it is blue that level pressure plug falls into salvaging
Interior, the inner cavity of oil pipe will establish communicating passage inside and outside oil pipe by liquid channel and the slot excessively of tube body and slot oil pipe；
(5) selection suitable method is gone into operation, specifically: if reservoir energy reaches self-spray operation condition, direct self-spray oil-producing；If
Reservoir energy is not up to self-spray operation condition, then gaslift induced flow is gone into operation；If gaslift induced flow is not up to self-spray operation condition, lower oil pumping
Pump turns suction and recovers the oil；
(6) it recovers the oil the later period, when needing to carry out separate zone production, it is only necessary to act sucker rod and oil well pump, put into and build the pressure into pipe string
Ball, the ball that makes to build the pressure are set in setting at anchor ring, complete the closure to tube body below anchor ring is set, and are closed under underbalance and are prevented in oil pipe
Spray tool；
(7) perforation through tubing operation and fracturing reform operation are carried out under under-balanced state；
(8) gas lift liquid drainage, lower oil well pump and sucker rod are carried out, pumping oil producing operation is restored.
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| CN201811615596.0A CN109577912B (en) | 2018-12-27 | 2018-12-27 | Blowout prevention tool in underbalanced lower oil pipe and one-pass underbalanced combined oil extraction method |
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|---|---|
| CN109577912B (en) | 2024-03-01 |
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Effective date of registration: 20201109 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Xibu Drilling Engineering Co.,Ltd. Address before: 830026 West Drilling and Drilling Engineering Research Institute, 326 South Asia Road, Urumqi Economic and Technological Development Zone, Xinjiang Uygur Autonomous Region Applicant before: CNPC Xibu Drilling Engineering Co.,Ltd. |
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