CN104747121B - Casing head protective sleeve - Google Patents

Casing head protective sleeve Download PDF

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Publication number
CN104747121B
CN104747121B CN201310729350.7A CN201310729350A CN104747121B CN 104747121 B CN104747121 B CN 104747121B CN 201310729350 A CN201310729350 A CN 201310729350A CN 104747121 B CN104747121 B CN 104747121B
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CN
China
Prior art keywords
housing
insertion tube
protective sleeve
lower end
casing head
Prior art date
Application number
CN201310729350.7A
Other languages
Chinese (zh)
Other versions
CN104747121A (en
Inventor
王昕宇
张宝彦
孙雪猛
Original Assignee
深圳市百勤石油技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳市百勤石油技术有限公司 filed Critical 深圳市百勤石油技术有限公司
Priority to CN201310729350.7A priority Critical patent/CN104747121B/en
Publication of CN104747121A publication Critical patent/CN104747121A/en
Application granted granted Critical
Publication of CN104747121B publication Critical patent/CN104747121B/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0021Safety devices, e.g. for preventing small objects from falling into the borehole

Abstract

A kind of casing head protective sleeve, for the inner chamber of production tree to be isolated with the liquid in oil pipe, to protect production tree, on production tree formed communicated with inner chamber and up and down just to upper flange and lower flange, it is characterised in that casing head protective sleeve includes:The housing of tubulose, housing lower end is regularly mutually butted with the upper flange of formation on production tree;Coaxially it is set in housing, and can be with housing along moving axially relative insertion tube common each other, insertion tube with respect to housing motion to predetermined first position when, the lower end of insertion tube is contained to housing, insertion tube with respect to housing motion to the second place when, the lower end of insertion tube is from housing insertion oil pipe;Insertion tube lower end is arranged with tubular sealing, seals during in the lower end of insertion tube insertion oil pipe, the connection for sealing is formed with oil pipe, so that the inner chamber of production tree is isolated with the liquid in oil pipe.Casing head protective sleeve of the invention can protect production tree, and using extremely convenient.

Description

Casing head protective sleeve

Technical field

The present invention relates to oil extraction apparatus field, more specifically to a kind of casing head protective sleeve.

Background technology

In field of petroleum exploitation, it is often necessary to carry out fracturing work, i.e., using ground high-pressure pump, by production tree to oil reservoir Fracturing fluid of the squeezing with viscosity higher.When the speed for injecting fracturing fluid exceedes the absorbability of oil reservoir, then in shaft bottom oil reservoir Upper to form pressure very high, when this pressure exceedes the shaft bottom fracture pressure of reservoir rock nearby, oil reservoir will be pressed off and produced Raw crack.At this moment, fracturing fluid on and on is squeezed to oil reservoir, crack will continue to oil reservoir interior expansion.In order to keep pressure The crack opened is in open configuration, is then clamp-oned with proppant to oil reservoir(Usually quartz sand)Load fluid, load fluid enters Enter after crack, crack on the one hand can be made to continue to extend forward, on the other hand can support the crack for having pressed off, make it not Cause in closure.Followed by injection displacement fluid, the load fluid of pit shaft is all replaced and enters crack, played fracture support with quartz sand Come.Finally, the high viscosity fracturing fluid of injection can degrade automatically discharge pit shaft outside, left in oil reservoir one or more length and width, The crack do not waited high, makes to set up a new fluid passage between oil reservoir and pit shaft.After pressure break, oil gas well yield is general Can increase substantially.

In petroleum industry, the rated operating pressure of production tree have to be larger than well maximum strata pressure, to ensure to recover the oil Tree can normal work.But because required pressure is higher than strata pressure during formation fracture, and often it is also greater than the specified of production tree Operating pressure.When required pressure is more than the rated operating pressure of production tree when the formation is fractured, fracturing work can only be just abandoned.

The content of the invention

In order to solve the above problems, it is an object of the invention to provide a kind of casing head protective sleeve, for by production tree Inner chamber is isolated with the liquid in oil pipe, to protect the production tree, forms upper with what the inner chamber communicated on the production tree Under just to upper flange and lower flange, the casing head protective sleeve includes:

The housing of tubulose, the housing lower end is regularly mutually butted with the upper flange of formation on the production tree;

Coaxially it is set in the housing, and can be with the housing along moving axially relative insertion common each other Pipe, when the relatively described housing motion of the insertion tube is to predetermined first position, the lower end of the insertion tube is contained to described In housing, when the relatively described housing motion of the insertion tube is to the second place, the lower end of the insertion tube is inserted from the housing In the oil pipe;

The insertion tube lower end is arranged with tubular sealing, and the sealing is used for described in the lower end insertion of the insertion tube When in oil pipe, the connection for sealing is formed with the oil pipe, so that the inner chamber of the production tree is isolated with the liquid in oil pipe.

According to casing head protective sleeve of the present invention, also including piston assembly, the piston assembly be used for it is external Fluid power system be connected, by the fluid power system power drive described in the relatively described housing of insertion tube it is upper and lower Activity.

According in casing head protective sleeve of the present invention, Packed storage is formed between the housing and the insertion tube Oily space, the piston assembly includes piston, opens up upper inlet and lower inlet on the housing, and the piston is fixed Be set in insertion tube middle part, the oil storage space is divided into upper reserve and lower reserve by the piston, it is described on Inlet is connected with the upper reserve, and the lower inlet is connected with the lower reserve.

According in casing head protective sleeve of the present invention, the piston coordinates fixed company with the insertion tube by screw thread Connect.

According to casing head protective sleeve of the present invention, also including spigot nut, the insertion tube lower end is provided with and institute State the external screw thread that spigot nut is engaged, the lower end of the sealing by it is clamping the spigot nut and the insertion tube lower end it Between.

According to casing head protective sleeve of the present invention, also including conduit, the lower end of the conduit and the insertion tube Threaded upper ends are connected or the conduit is integrally formed with the insertion tube.

According in casing head protective sleeve of the present invention, first flange joint is formed after the upper end of the conduit is expanding, External fracturing unit is connected for flange.

According in casing head protective sleeve of the present invention, expanding rear formation the in lower end of the conduit locks flange, institute The expanding rear lower locking flange of formation in housing upper end is stated, the upper locking flange is connected admittedly with the lower flange of locking by flange It is fixed.

According in casing head protective sleeve of the present invention, second flange joint, institute are formed after the housing lower end is expanding State second flange joint flange and be connected to the upper flange, so that the housing lower end is docked admittedly with the upper flange of the production tree It is fixed.

According in casing head protective sleeve of the present invention, the housing includes:The first pipe including the housing upper end Section, the second middle pipeline section and the 3rd pipeline section including the housing lower end, the two ends difference fixed cover of second pipeline section It is located at the first pipeline section lower end and the 3rd pipeline section upper end.

Implementing casing head protective sleeve of the invention can keep apart fracturing fluid with production tree when fracturing work is carried out, energy Production tree is enough protected, and using extremely convenient.

Brief description of the drawings

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:

Fig. 1 is structure of the first embodiment of the invention casing head protective sleeve when insertion tube is in first position with respect to housing Schematic diagram.

Fig. 2 for when the casing head protective sleeve of second embodiment of the invention is in the first operating mode with the connection signal of production tree Figure.

Fig. 3 for when the casing head protective sleeve of second embodiment of the invention is in the second operating mode with the connection signal of production tree Figure.

Specific embodiment

In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that instantiation described herein is only used to explain the present invention, not For limiting the present invention.

Fig. 1 is referred to, in oil extraction field, the end link of oil extraction is controlled usually using production tree 5 System.In Fig. 1, production tree 5 includes inner chamber(Non- label), the upper flange 51 and lower flange communicated with inner chamber are offered on production tree 5 52, the lower flange of upper flange 51 is facing each other about 52.Upper flange 51 is general to be closed when recovering the oil, the external pressure break in fracturing work Equipment.Existing oil pipe 6 is docked with lower flange 52, for crude oil to be drawn from underground, or pressure break is injected from oil pipe 6 to underground Liquid.

Fig. 1 is referred to, Fig. 1 is knot of the first embodiment of the invention casing head protective sleeve when insertion tube is in first position Structure schematic diagram.As shown in figure 1, casing head protective sleeve includes the housing 1 and insertion tube 2 of integrally formed tubulose.Insertion tube 2 is coaxial Be set in housing 1, and can be with housing 1 along common moving axially relative each other.Second is formed after the lower end of housing 1 is expanding Bump joint 11, the expanding rear lower locking flange 12 of formation in upper end of housing 1, divides on second flange joint 11 and lower locking flange 12 Do not offer for bolted multiple screwed holes 110 and multiple screwed holes 120.

The tubular oil storage space of sealing is formed between housing 1 and insertion tube 2(Non- label), oil storage space separated by piston 33 It is upper reserve 31 and lower reserve 32.The upper inlet 34 communicated with upper reserve 31 is offered in the upper end of housing 1, in shell The lower end of body 1 offers the lower inlet 35 communicated with oil storage space 32, and upper inlet 34 and lower inlet 35 can be used to allow outer The fluid power system that connects distinguishes upward reserve 31 and lower reserve 32 injection hydraulic oil or from upper reserve 31 and lower oil storage Area 32 outwards releases hydraulic oil.

The lower end of insertion tube 2 is fixed and is arranged with sealing 21, and 21 fixed sleeves of sealing are provided with spigot nut 22, spigot nut 22 Lower end with insertion tube 2 is connected by screw threads for fastening, and sealing 21 is by clamping between spigot nut 22 and insertion tube 2.

In the present embodiment, piston 33 is regularly set on housing 1 by screwed connection.Piston 33, upper inlet 34 And the lower composition of inlet 35 piston assembly(Non- label), external fluid power system(It is not shown)By driving piston assembly, So as to drive insertion tube 2 up and down with respect to housing 1.When the hydraulic pump forward direction pump oil of fluid power system, upper reserve 31 Inject hydraulic oil through upper inlet 34, lower reserve 32 through releasing hydraulic oil in lower inlet 35, the at this moment pressure on upper and lower both sides Official post obtains piston 33 and drives insertion tube 2 to move downward.

Casing head protective sleeve also includes conduit 4, is formed after the lower end of conduit 4 is expanding and locks flange 41, the upper end of conduit 4 First flange joint 42 is formed after expanding, is offered respectively for bolt connection on upper locking flange 41 and first flange joint 42 Multiple screwed holes 410,420.The lower end of conduit 4 is fastenedly connected with the upper end of insertion tube 2 by screw thread cooperation, while upper locking Flange 41 and lower locking flange 12 are equipped with screw bolt and nut to fix locking by screwed hole 410,120.The upper end docking of conduit 4 After fracturing unit, by first flange joint 42 set screwed hole 420 and be equipped with screw bolt and nut so as to and fracturing unit It is fastenedly connected.

Refer to Fig. 2, Fig. 2 is for when the casing head protective sleeve of the second embodiment of the present invention is in the first operating mode and production tree Connection diagram.

Different from the integrally formed housing 1 in embodiment one, 1 point of housing in the present embodiment is the first pipeline section 1A, the Two pipeline section 1B and the 3rd pipeline section 1C.Wherein, the first pipeline section 1A includes the lower locking flange 12 formed after the upper end of housing 1 is expanding, the Three pipeline section 1C include the second flange joint 11 formed after the lower end of housing 1 is expanding.One end 13 of second pipeline section 1B and the other end 14 Fixation respectively is set in the lower end of the first pipeline section 1A and the upper end of the 3rd pipeline section 1C, and it is fixedly connected mode preferably screw thread and connects Connect, it is fixedly connected mode and can also be welding, threaded connection, interference fit connection or other known fixed forms.Pass through The above-mentioned threaded connection of each several part of housing 1, housing 1 can easily be manufactured and assembled with insertion tube 2 and piston assembly.

Casing head protective sleeve passes through on the upper flange 51 of the screwed hole 110 and production tree opened up on second flange joint 11 The bolt of upper flange 51 is fastenedly connected, so as to be arranged on production tree 5.Now, insertion tube 2 is in first position relative to housing 1, Extreme higher position is in figure.

Under the first operating mode, the lower end of insertion tube 2 is included into housing 1.The inner chamber of production tree is connected with the inner chamber of oil pipe It is logical.Now casing head protective sleeve does not influence other normal operations in addition to pressure break, such as oil producing operation, easy to operate.

Refer to Fig. 3, Fig. 3 is for when the casing head protective sleeve of the second embodiment of the present invention is in the second operating mode and production tree Connection diagram.With reference to refering to Fig. 2, casing head protective sleeve is installed with such as Fig. 2 of production tree 5 after being connected, make external hydraulic pressure Hydraulic oil is injected in the hydraulic pump forward direction pump oil of drive system, upper reserve 31 through upper inlet 34, and lower reserve 32 is through lower feed liquor Hydraulic oil is released in mouth 35, at this moment the pressure differential on upper and lower both sides causes that piston 33 drives insertion tube 2 to be moved downward from extreme higher position. When housing 1 is moved downwardly to extreme lower position as shown in Figure 3, hydraulic pump, the second operating mode shown in Fig. 3 are closed.

Now, in the lower end insertion oil pipe 6 of insertion tube 2, the sealing 21 that the lower end of insertion tube 2 is assembled is so that insertion tube 2 Lower end and oil pipe 6 form the connection of sealing so that the inner chamber of oil pipe 6 is isolated with the inner chamber of production tree 5.

The upper locking flange 41 that the lower end of conduit 4 is formed after expanding by bolt now and the upper end formation of housing 1 Locked after the lower locking bolt connection of flange 12, because the upper end of insertion tube 2 is connected with 4 lower end by screw threads for fastening, prevent to insert Enter pipe 2 to be moved upwards with respect to housing 1.

Under the second operating mode, because inner chamber and the inner chamber of production tree 5 of oil pipe 6 are isolated, fracturing fluid can be from external pressure The equipment of splitting sequentially passes through 4 inner chamber, the inner chamber of insertion tube 2 and enters in oil pipe 6, but will not enter into the inner chamber of production tree 6, this Shi Jinhang fracturing works, then will not produce destructive pressure to production tree 5.

When turning to the first operating mode from the second operating mode, only need to make the reverse pump oil of hydraulic pump, upper reserve 31 is through upper inlet 34 Hydraulic oil is released, through injecting hydraulic oil in lower inlet 35, at this moment the pressure differential on upper and lower both sides causes piston 33 for lower reserve 32 Insertion tube 2 is driven to move upwards, when insertion tube 2 rises to the i.e. extreme higher position in first position, the lower end retraction housing 1 of insertion tube 2 In, that is, it is changed into the first operating mode.If not using casing head protective sleeve for a long time, it can also easily be unloaded.

It will be appreciated by persons skilled in the art that each flange of the invention is when flange is connected, on the flange being connected Screw thread hole site and size are corresponded, and are matched with the bolt of the flange, nut is fastened.In addition, the oil recovery in the present invention Setting the junction of each flange of protective case can be additionally carried out sealing reinforcement, and hand is sealed as known to using seal washer etc. Duan Jinhang sealings are strengthened.

The first signified operating mode can be oil producing operation in the present invention, can also make for gas production operation etc. is normal of course Industry;The second signified operating mode can be fracturing work in the present invention, can also be tieed up for workover treatment or kill-job operation etc. of course Shield operation.

The application method of casing head protective sleeve of the invention is carried out with the casing head protective sleeve of second embodiment only below More detailed description.The application method of casing head protective sleeve of the invention includes step:

A) sealing 21 is arranged on insertion tube 2, re-tightens spigot nut 22, and applied on spigot nut 22 and sealing 21 Smear lubricating grease;

B) gasket ring is placed on upper flange 51, whole device is vertically sling, make the second of casing head protective sleeve Bump joint 11 is tightened after being aligned with upper flange 51 with bolt;

C) changing on the hydraulically controlled station with hydraulic line by upper inlet 34, lower inlet 35 with external fluid power system Connected to the outlet line interface of valve;

D) hydraulically controlled station reversal valve handle is operated, inlet 34 on casing head protective sleeve is entered hydraulic oil, promote piston total Into and insertion tube 2 it is descending so that insertion tube 2 and sealing 21 enter into the inner chamber of oil pipe 6, while upper locking flange 41 is with insertion tube 2 It is descending together, fall on lower locking flange 12;

E) fastened with bolt and lock flange 41 and lower locking flange 12;

F) other connectors such as nonyl joint, plug valve, high pressure elbow and pipeline etc. are recycled, by first flange joint 42 with Fracture manifold is connected and can be carried out construction operation, such as fracturing work.

In addition, being operated according to opposite the carrying out of above step after the completion of construction operation, it is possible to realize being extracted from oil pipe 6 Insertion tube 2, and production tree pressure break protective case is easily unloaded from production tree 5.

If needed during next section of pressure break the pressure break bulb diameter that is put into oil pipe more than insertion tube 2 internal diameter when, be When oily overpressure drops to the rated operating pressure less than production tree 5 after pressing crack construction termination of pumping, removable upper locking flange 41, under Locking flange 12, pulls hydraulically controlled station reversal valve handle, makes piston 33 and insertion tube 2 up, and the lower end of insertion tube 2 is received to shell In body 1, then the mode from the flutter valve pitching of production tree 5 proceeds fracturing operation.

Casing head protective sleeve of the invention can be facilitated by fluid power system between the first operating mode and the second operating mode Ground switching, and after being finished construction operation is carried out, without dismantling casing head protective sleeve, only rises to the by insertion tube 2 Other normal operations such as recover the oil can be carried out behind one position.Even if also very convenient during dismounting when not using for a long time.

Claims (10)

1. a kind of casing head protective sleeve, for the inner chamber of production tree (5) to be isolated with the liquid in oil pipe (6), to protect State production tree (5), formed on the production tree (5) communicated with the inner chamber up and down just to upper flange (51) and lower flange (52), it is characterised in that the casing head protective sleeve includes:
The housing (1) of tubulose, housing (1) lower end is regularly mutual with the upper flange (51) of formation on the production tree (5) Docking;
Coaxially it is set in the housing (1), and can be with the housing (1) along moving axially relative insertion common each other Pipe (2), when the relatively described housing (1) of the insertion tube (2) moves to predetermined first position, the lower end of the insertion tube (2) It is contained to the housing (1), when the relatively described housing (1) of the insertion tube (2) moves to the second place, the insertion tube (2) inserted in the oil pipe (6) from the housing (1) lower end;
Insertion tube (2) lower end is arranged with tubular sealing (21), and the sealing (21) is under the insertion tube (2) When the end insertion oil pipe (6) is interior, the connection for sealing is formed with the oil pipe (6), so that the inner chamber of the production tree (5) and oil Liquid in pipe (6) is isolated.
2. casing head protective sleeve according to claim 1, it is characterised in that also including piston assembly, the piston assembly For being connected with external fluid power system, by the fluid power system power drive described in insertion tube (2) Relatively described housing (1) is up and down.
3. casing head protective sleeve according to claim 2, it is characterised in that the housing (1) and the insertion tube (2) it Between form Packed oil storage space, the piston assembly includes piston (33), the upper inlet being opened on the housing (1) (34) and lower inlet (35), the piston (33) is regularly set in the insertion tube (2) middle part, and the piston (33) is by institute State oil storage space and be divided into upper reserve (31) and lower reserve (32), the upper inlet (34) and the upper reserve (31) It is connected, the lower inlet (35) is connected with the lower reserve (32).
4. casing head protective sleeve according to claim 3, it is characterised in that the piston (33) and the insertion tube (2) Coordinated by screw thread and be fixedly connected.
5. casing head protective sleeve according to claim 1, it is characterised in that also including spigot nut (22), the insertion Pipe (2) lower end is provided with the external screw thread being engaged with the spigot nut (22), and the lower end of the sealing (21) is by clamping in institute State between spigot nut (22) and the insertion tube (2) lower end.
6. casing head protective sleeve according to claim 1, it is characterised in that also including conduit (4), the conduit (4) Lower end is connected with the threaded upper ends of the insertion tube (2) or the conduit (4) is integrally formed with the insertion tube (2).
7. casing head protective sleeve according to claim 6, it is characterised in that first is formed after the upper end of the conduit is expanding Bump joint (42), external fracturing unit is connected for flange.
8. casing head protective sleeve according to claim 7, it is characterised in that formed after the lower end of the conduit (4) is expanding Upper locking flange (41), forms lower locking flange (12), upper locking flange (41) and institute after housing (1) upper end is expanding Lower locking flange (12) is stated to be connected by flange.
9. casing head protective sleeve according to claim 1, it is characterised in that the is formed after housing (1) lower end is expanding Two bump joints (11), second flange joint (11) flange is connected to the upper flange (51), so that under the housing (1) Fixation is docked with the upper flange (51) of the production tree (5) in end.
10. casing head protective sleeve according to any one of claim 1 to 9, it is characterised in that the housing (1) includes: The first pipeline section (1A) including the housing (1) upper end, middle the second pipeline section (1B) and including the housing (1) lower end The 3rd pipeline section (1C), fixation is set under first pipeline section (1A) respectively for the two ends (13,14) of second pipeline section (1B) End and the 3rd pipeline section (1C) upper end.
CN201310729350.7A 2013-12-25 2013-12-25 Casing head protective sleeve CN104747121B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310729350.7A CN104747121B (en) 2013-12-25 2013-12-25 Casing head protective sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310729350.7A CN104747121B (en) 2013-12-25 2013-12-25 Casing head protective sleeve

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CN104747121A CN104747121A (en) 2015-07-01
CN104747121B true CN104747121B (en) 2017-07-07

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6186239B1 (en) * 1998-05-13 2001-02-13 Abb Vetco Gray Inc. Casing annulus remediation system
CN101748983A (en) * 2008-12-12 2010-06-23 中国石油大学(北京) Protector for oil pipe working under pressure used for oil well
CN202157777U (en) * 2011-07-08 2012-03-07 中国石油天然气股份有限公司 Well head protector of hydraulic base seal
CN202249899U (en) * 2011-09-22 2012-05-30 中国石化集团江汉石油管理局井下测试公司 Pressure isolating device for wellhead production tree
CN203022675U (en) * 2012-12-21 2013-06-26 东营鑫华莲石油机械有限公司 Thermal recovery well mouth protecting device
CN103443392A (en) * 2011-01-11 2013-12-11 阿克海底公司 Bore protector

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6186239B1 (en) * 1998-05-13 2001-02-13 Abb Vetco Gray Inc. Casing annulus remediation system
CN101748983A (en) * 2008-12-12 2010-06-23 中国石油大学(北京) Protector for oil pipe working under pressure used for oil well
CN103443392A (en) * 2011-01-11 2013-12-11 阿克海底公司 Bore protector
CN202157777U (en) * 2011-07-08 2012-03-07 中国石油天然气股份有限公司 Well head protector of hydraulic base seal
CN202249899U (en) * 2011-09-22 2012-05-30 中国石化集团江汉石油管理局井下测试公司 Pressure isolating device for wellhead production tree
CN203022675U (en) * 2012-12-21 2013-06-26 东营鑫华莲石油机械有限公司 Thermal recovery well mouth protecting device

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