CN104975818B - Device and technological method for pulling lower oil tube - Google Patents

Device and technological method for pulling lower oil tube Download PDF

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Publication number
CN104975818B
CN104975818B CN201510387235.5A CN201510387235A CN104975818B CN 104975818 B CN104975818 B CN 104975818B CN 201510387235 A CN201510387235 A CN 201510387235A CN 104975818 B CN104975818 B CN 104975818B
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CN
China
Prior art keywords
hanger
oil
reducing
seal
oil tube
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CN201510387235.5A
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Chinese (zh)
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CN104975818A (en
Inventor
于雷
高彦生
王玉国
郭玉强
欧阳涛
肖昌
李洪波
王军辉
马骁
孙延辉
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中国石油天然气股份有限公司
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Priority to CN201510387235.5A priority Critical patent/CN104975818B/en
Publication of CN104975818A publication Critical patent/CN104975818A/en
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Publication of CN104975818B publication Critical patent/CN104975818B/en

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Abstract

The invention discloses a device and a technological method for pulling a lower oil tube. The device comprises a large cross, a hanger, a hanger plug, a double ram type preventer and a sealing piece. The large cross comprises a first channel, a second channel, a third channel and a fourth channel, wherein the first channel is connected with a well mouth flange in a sealing mode, and the second channel is connected with the double ram type preventer in a sealing mode. A hanger seat is arranged at the position of the second channel, an open flow pipeline is arranged on the third channel and/or the fourth channel, and a first valve is arranged on the open flow pipeline. A liquid flow channel is formed between the hanger and the large cross, the hanger is provided with a first matching part and a second matching part opposite to the first matching part, the first matching part is matched with the hanger seat, and the second matching part is used for fixing the oil tube. The lower end of the hanger plug is fixed to the hanger in a sealing mode. The double ram type preventer is connected with a containing seat in a sealing mode. The sealing piece is arranged in the containing seat. The device and the technological method for pulling the lower oil tube are suitable for non-well killing operation, high in operation efficiency and low in cost.

Description

The equipment and process of lower oil tube
Technical field
The present invention relates to a kind of oil field snubbing serving technical field, the equipment and technique of more particularly to a kind of lower oil tube Method.
Background technology
As oil field development to middle and later periods, reservoir pressure are reduced, low pressure well gradually increases.The low pressure well is primarily referred to as 1 MPa is not more than for wellhead shut-in pressure, gas liquid ratio is not more than 100, fluid temperature (F.T.) and is not higher than 80 degrees Celsius, hydrogen sulfide content The oil-water well that not higher than 15 milligrams/cubic metre, reservoir pressure coefficient are less than 0.7.
When carrying out lower oil tube operation for the low pressure well, first have to be carried out by way of injecting well killing fluid into well Kill-job, especially for serious well is missed, will also take multiple kill-job mode.During the kill-job operation, it injects into well Well killing fluid not only can polluted reservoir, can also increase stratum water, increase operation after pump drainage period and increase effluent cycle Processing cost, to production capacity is recovered after operation difficulty is brought.So needing a kind of special no killing well to make for these low pressure wells Industry technique, realizes no killing well lower oil tube.
It is closed operation that existing no killing well removes technique, is sealed initially with annular preventer or tubular preventer Annular space, has then carried out lower tubular column by removing mechanism by force.It is described when removing mechanism's operation by force, have that efficiency is low, cost High defect:It is general, by it is described remove mechanism's operation by force when, because its equipment is huge, generally there is 5 meters high, therefore need It is equipped with special job platform;Because equipment is huge, also relatively slow during installation and transportation, it rises during operation for the mechanism that removes by force Lower speed is slow, and tubing string of unloading from job platform is slow, and the technical process of the non-capping tools in down-hole or Special Tool is slow, therefore typically The individual well activity duration more than 10 days, individual well operating cost need 170,000 or so.
Therefore, it is necessary to propose a kind of process of the no killing well lower oil tube suitable for low pressure well, operation effect is improved Rate, reduces cost.
The content of the invention
It is an object of the invention to provide the equipment and process of a kind of lower oil tube suitable for snubbing serving, operation Efficiency high, low cost.
The above-mentioned purpose of the present invention can be realized using following technical proposal:
A kind of equipment of lower oil tube, including:Big four, hanger, hanger plug, double ram type preventer, seal, The big four includes the first relative path, alternate path and relative third path, fourth passage, its first path and well Mouth flange seal connection, its alternate path is tightly connected with the double ram type preventer;The alternate path position is provided with outstanding Hanging device seat, for hermetically arranging the hanger, in its third path and/or fourth passage relief line is provided with, in institute State and be provided with relief line the first valve;The hanger is in hollow multidiameter, and it forms liquid between the big four Circulation road, it has relative the first auxiliary section and the second auxiliary section, and first auxiliary section coordinates with the hanger seat, institute The second auxiliary section is stated for fixing oil pipe;The hanger plug, its lower end is sealingly fixed on the hanger;It is described double Ram preventer partly seals flashboard including reducing slips, reducing, is connected with containing seat the reducing slips up seal;The sealing Part is arranged in the containing seat, and it is used to be set in oil pipe periphery, realizes the dynamic sealing of oil pipe.
In a preferred embodiment, it also includes fluid reservoir, and described relief line one end connects with the third path, The other end is connected with the fluid reservoir.
In a preferred embodiment, be provided with oil-water recovering device outside the containing seat, the oil-water recovering device with The draining pipeline that the oil-water recovering device can be connected with the fluid reservoir is provided between the fluid reservoir.
In a preferred embodiment, the seal is the resilient circular glue core of tool, and its minimum diameter is less than and treats Play the external diameter of flowline.
In a preferred embodiment, the equipment total height of the lower oil tube is not higher than 550 millimeters.
A kind of process of lower oil tube, including:
Before entering hanger plug under, blanking plug is delivered into oil pipe, realize closure in pipe;
Hanger plug is installed on hanger;
The hanger plug is above carried, reducing half is closed and is sealed flashboard and reducing slips;
After removal hanger, seal is installed on containing seat;
Open reducing half and seal flashboard and reducing slips, the first valve, carry out open flow;
Play oil pipe.
In a preferred embodiment, blanking plug is delivered into oil pipe, is realized in pipe after closure, also including detection well head pressure Power, temperature, hydrogen sulfide content.
In a preferred embodiment, when needing to change the seal, close the reducing and partly seal flashboard.
In a preferred embodiment, when there is gas blowout accident, first close the reducing half and seal flashboard and reducing slips, It is then shut off first valve.
In a preferred embodiment, after the installation double ram type preventer, also include entering the double ram type preventer Row pressure testing.
The features and advantages of the invention are:The equipment of lower oil tube of the present invention, using the seal annular space is sealed, The first valve at big four is allowed to carry out annular space open flow in opening when carrying out rountrip simultaneously, while double disc , come top, simple structure on preventing, without the need for job platform, convenient working, the individual well activity duration, cost was 3,4 in operation in 3 days for preventer Ten thousand or so.Relative to it is existing remove mechanism by force for, substantially increase operating efficiency, reduce operating cost.
Secondly, the equipment availability process of lower oil tube of the present invention seals annular space lower oil tube operation by seal, together When big four be in opening, when there are the emergency episodes such as blowout, turn off variable bore ram and reducing slips, safely may be used Lean on.
Additionally, the apparatus adaptability of lower oil tube of the present invention is strong.Because the seal reducing scope is big, can cross and connect Hoop, while the reducing for static seal half seals flashboard and is all variable-diameter structure for anti-top reducing slips, can adapt to well The needs of lower combined string.
Description of the drawings
Fig. 1 is a kind of structural representation of the equipment of lower oil tube in the embodiment of the present invention;
Fig. 2 is a kind of view of the equipment of lower oil tube in the embodiment of the present invention;
Fig. 3 is a kind of installment state figure when equipment of lower oil tube in the embodiment of the present invention is used;
Fig. 4 is a kind of process method flow chart of lower oil tube in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme is elaborated, it should be understood that these realities Apply example to be only illustrative of the invention and is not intended to limit the scope of the invention, after the present invention has been read, people in the art Modification of the member to the various equivalent form of values of the present invention is each fallen within the application claims limited range.
A kind of equipment and process of lower oil tube suitable for snubbing serving of present invention offer, operating efficiency height, Low cost.
Fig. 1 is referred to, is a kind of structural representation of the equipment of lower oil tube in the embodiment of the present invention.The lower oil tube Equipment include:Big four 1, hanger 2, hanger plug 20, double ram type preventer 3, seal 4, relief line 5.
The big four 1 includes the first relative path 11, alternate path 12 and relative third path 13, fourth passage 14.First path 11 is located at along the relative lower position on gravity direction.First path 11 and wellhead flange A It is tightly connected.The internal diameter of first path 11 matches with the internal diameter of the wellhead flange A.Such as described first path 11 Internal diameter is equal with the internal diameter of the wellhead flange A.The alternate path 12 is located at along the relative upper position on gravity direction Put.The alternate path 12 is tightly connected with the double ram type preventer 3.The position of the alternate path 12 is provided with hanger seat 15, for hermetically arranging the hanger 2.Specifically, the hanger seat 15 can be the inwall in the alternate path 12 One section of necking down of upper formation.The third path 13 is located at along the relative side in horizontal direction.The third path 13 On be provided with relief line 5, the first valve 50 is provided with the relief line 5.One end of the relief line 5 and described Three-way 13 is connected, the other end with lead to fluid reservoir 6.When the liquid flows upwards in oil jacket annular space, can by with it is described The third path 13 that oil jacket annular space is connected, imports the fluid reservoir.The fourth passage 14 is located at along in horizontal direction Relative opposite side.Relief line can also be set, accordingly, it is also possible on the relief line in the fourth passage 14 Corresponding first valve is set.Described relief line one end can be connected with the fourth passage 14, and the other end also leads into storage Flow container 6.Additionally, kill line can be arranged in the fourth passage 14, and arrange corresponding second in the fourth passage 14 Valve, for controlling the circulation of well killing fluid.
Fig. 2 is referred to, the hanger 2 is in hollow multidiameter, and there is relative the first auxiliary section 21 and second to match somebody with somebody for it Conjunction portion 22.More than the external diameter of second auxiliary section 22, i.e., described hanger 2 is from top to bottom for the external diameter of first auxiliary section 21 External diameter gradually successively decreases.First auxiliary section 21 coordinates with the hanger seat 15, specifically, outside first auxiliary section 21 Footpath is more than the internal diameter at the hanger seat 15.The position that the hanger 2 coordinates with the hanger seat 15 is also provided with Annular seal, for ensureing the sealing at hanger 2 and the hanger seat 15 cooperation.The upper end of the hanger 2 Inner side is provided with screw thread, for arranging hanger plug 20.Second auxiliary section 22 is used to fix oil pipe C.Specifically, it is described Second auxiliary section 22 concretely has threaded pipeline section, and it is used to be connected with the screw thread of oil pipe upper end.Described Two auxiliary sections 22 are located in the big four 1, and its external diameter is less than the internal diameter at the path 11 of the big four 1 first.It is described outstanding Fluid course B is formed between second auxiliary section 22 of hanging device 2 and the big four 1.Liquid flows upwards in oil jacket annular space When, the third path 13 can be flowed to by the fluid course B, so as to pass through relief line 5, import the fluid reservoir 6。
The hanger plug 20, its lower end is sealingly fixed on the hanger 2.During the hanger plug 20 is Empty tubing string, its lower end is provided with screw thread, for being fixedly connected with the hanger 2.On the tube wall of the hanger plug 20 By-pass prot is provided with, being provided with the relevant position of the by-pass prot can open or close the ball valve mechanism of the by-pass prot.When When the double ram type preventer 3 needs pressure testing, can think that injection liquid is suppressed in the hanger plug 20, was being suppressed Ball valve mechanism described in journey opens the by-pass prot so that the liquid of injection can be flowed in the double ram type preventer 3, continues Suppress injection liquid, until it reaches double ram type preventer rated pressure, that is, realize the work pressure test to double ram type preventer 3.
The double ram type preventer 3 includes that reducing slips 31, reducing half seals flashboard 32, on the reducing slips 31 hermetically It is connected with containing seat 33.The reducing slips 31 is located at the reducing half and seals the top of flashboard 32.Because down-hole string generally has Different specifications, therefore, correspondingly the reducing half seals the flashboard B and reducing slips C includes plurality of specifications.For example work as down-hole When tubing string is combined for the oil pipe of 73 millimeters of external diameter Φ and the tubing coupling of 89 millimeters of external diameter Φ, then correspondingly, the reducing slips 31st, the reducing scope that reducing half seals flashboard 32 can be 89 millimeters of 73 millimeters of Φ to Φ.When down-hole string is for 89 millimeters of external diameter Φ's When the tubing coupling of 114 millimeters of oil pipe and external diameter Φ is combined, then correspondingly, the reducing slips 31, reducing half seals flashboard 32 Reducing scope can be 114 millimeters of 89 millimeters of Φ to Φ.When using, the internal diameter that the reducing half seals flashboard 32 is outer with corresponding tubing string Footpath is consistent, can embrace corresponding tubing string, realizes static seal.Additionally, the reducing for static seal half seals flashboard 32 and uses Reducing slips 31 in anti-upper top is all variable-diameter structure, can adapt to the needs of down-hole combined string.
The seal 4 is arranged in the containing seat 33, and it is used to being set in, and oil pipe C is peripheral, realizes that oil pipe C's is dynamic close Envelope.The seal 4 is the resilient circular glue core of tool, external diameter of its minimum diameter less than flowline C to be risen, when described close Sealing 4 be set in oil pipe C it is peripheral when, it is attached on oil pipe C outer walls in the presence of elastic-restoring force, closely, when oil pipe C exists During above carrying, the seal 4 can be in close contact all the time with the oil pipe C.The equipment of lower oil tube of the present invention By the sealing wellhead annular space of the seal 4, to carry out lower oil tube operation, without the need for removing mechanism by force in operation process, with Existing to remove mechanism's operation by force and compare, operating efficiency is high, low cost.Further, since the reducing scope of the seal 4 it is big, Box cupling can be crossed, simultaneously dynamic sealing can be carried out to oil pipe and tubing coupling, can adapt to the needs of down-hole combined string.
The equipment of the lower oil tube also includes fluid reservoir 6, and the one end of the relief line 5 connects with the third path 13 Logical, the other end is connected with the fluid reservoir 6.The liquid storage fills 6 to be used to collect in the well by fluid course B, third path 13rd, the liquid that relief line 5 is flowed into.
Oil-water recovering device 7 is provided with outside the containing seat 33, the oil-water recovering device 7 is used for when tubing string is unloaded, and returns Liquid in collection tube, prevents well head from polluting.Energy is provided between the oil-water recovering device 7 and the fluid reservoir 6 will be described The draining pipeline 70 that oil-water recovering device 7 is connected with the fluid reservoir 6.When unloading tubing string, using oil-water recovering device 7 recovery tube is carried out Interior liquid, prevents well head from polluting.The oil-water recovering device 7 is arranged on the upper surface of the double ram type preventer 3, recyclable to unload Liquid after button in oil pipe C.The liquid that the oil-water recovering device 7 is reclaimed flows into fluid reservoir 6 by draining pipeline 70.
The equipment total height of the lower oil tube is not higher than 550 millimeters.Due to the equipment height of lower oil tube of the present invention Degree is relatively low, therefore without the need for job platform, convenient working.
The equipment of lower oil tube of the present invention when in use, delivers blanking plug and completes pipe to oil pipe C precalculated positions first Interior closure, then accordingly detects the pressure of well head, to judge the pressure whether in predetermined pressure limit;Detection well head Temperature, to judge the temperature whether within the scope of predetermined temperature;The hydrogen sulfide content of detection well head, to judge the sulphur Whether change hydrogen content is in predetermined scope.If the pressure is in predetermined pressure limit, the temperature is in predetermined temperature In the range of degree and the hydrogen sulfide content is in predetermined scope, then then hanger plug 20 is connected on hanger 2.
Fig. 3 is referred to, is a kind of installment state figure when equipment of lower oil tube in the embodiment of the present invention is used.Carry out Before lower oil tube, it may be necessary to carry out rod job.When rod job is carried out, need to be installed in well head Big four 1 and controllable actuating oil-pumping unit device D.For this purpose, in the present invention, when carrying out lower oil tube operation, by described outstanding The hanger plug 20 is installed in hanging device 2 can realize that the reliability at hanger 2 is blocked, and remove controllable to guarantee safety Actuating oil-pumping unit device D and safety install double ram type preventer 3.Complete to be sealed in pipe when blanking plug is delivered to oil pipe C precalculated positions After stifled, can carry out removing the sequence of operations such as controllable actuating oil-pumping unit equipment.
Suit double ram type preventer 3.Set is installed after the double ram type preventer 3, and the double ram type preventer 3 is tried Pressure.The process that pressure testing is carried out to double ram type preventer 3 can be completed by the hanger plug 20.Specifically, the present invention The hanger plug 20 can pass through the screwed connection of lower end and buckle in the hanger 2, complete connection and sealing, described The function that hanger plug 20 has closure, pressure testing, lifts short circuit simultaneously.During concrete pressure testing, first close the reducing and partly seal lock Plate 32 so as to embrace the hanger plug 20, realizes sealing;Then pressure testing liquid is squeezed into from the upper end of hanger plug 20 Body, the pressure testing liquid is entered in the double ram type preventer 3 by the by-pass prot of the hanger plug 20;When pressure reaches Rated pressure, completes pressure testing.Relative to existing pressure testing mode, during pressure testing, need to remove hanger plug 20, enter down again Pressure-test short joint comes for pressure testing, has not only saved operation, also eliminates pressure-test short joint.
After the pressure testing of the double ram type preventer 3 is qualified, the hanger plug 20 is above carried, specifically, described in being connected Hanger 2 proposes more than the upper surface of the double ram type preventer 3, is then shut off reducing half and seals flashboard 32 and reducing slips 31, unloads After falling the hanger 2, seal 4 is installed, to realize the safe blowout prevention for installation or operation process.When needing disassembling, assembling and replacing Seal 4, dismounting hanger 2 or when running into the emergency episodes such as blowout, it is desirable to close reducing half and seal flashboard 32, reducing slips 31, After closing can security seal annular space, while prevent on tubing string push up.
Followed by lower oil tube operation, now, open the reducing half and seal flashboard 32, reducing slips 31 and described First valve 50.
Due to the matching relationship between the seal 4 and tubing string be dynamic sealing, tubing string during upper carrying can with it is described Seal 4 rubs, so as to produce abrasion to the seal 4.It is described by closing when needing to change seal 4 Reducing half seals flashboard 32 to carry out.
When there are the emergency episodes such as blowout, the reducing half is first closed immediately and seals flashboard 32 and the reducing slips 31, the first valve 50 being then shut off at the big four 1.
In sum, the equipment of lower oil tube of the present invention, using the seal 4 annular space is sealed, and carries out removing work The first valve 50 at big four 1 is allowed to carry out annular space open flow in opening during industry simultaneously, while double ram type preventer 3 To prevent above top, simple structure, without the need for job platform, convenient working, the individual well activity duration, cost was left 3,40,000 in operation in 3 days It is right.Relative to it is existing remove mechanism by force for, substantially increase operating efficiency, reduce operating cost.
Secondly, the equipment availability process of lower oil tube of the present invention seals annular space lower oil tube operation by seal 4, together When big four 1 be in opening, when there are the emergency episodes such as blowout, turn off variable bore ram 32 and reducing slips 31, pacify It is complete reliable.
Additionally, the apparatus adaptability of lower oil tube of the present invention is strong.Because the reducing scope of the seal 4 is big, can mistake Box cupling, while the reducing for static seal half seals flashboard 32 and is all variable-diameter structure for anti-top reducing slips 31, can Adapt to the needs of down-hole combined string.
Fig. 4 is referred to, is a kind of process method flow chart of lower oil tube in the embodiment of the present invention.A kind of lower oil tube Process, including:
S1:Before entering hanger plug 20 under, blanking plug is delivered into oil pipe C, realize closure in pipe;
S2:Double disc open flow device 3 is installed;
S3:Hanger plug 20 is installed, the hanger plug 20 is above carried, is closed reducing half and is sealed flashboard 32 and reducing slips 31;
S4:After removal hanger 2, seal 4 is installed on containing seat 33;
S5:Open reducing half and seal flashboard 32 and reducing slips 31, the first valve 50 at big four 1, carry out open flow;
S6:Play oil pipe C.
S1:Before entering hanger plug 20 under, blanking plug is delivered into oil pipe C, realize closure in pipe.
Blanking plug is delivered into oil pipe C, is realized in pipe after closure, also contained including detection well head pressure, temperature, hydrogen sulfide Amount.Specifically, the pressure of well head is accordingly detected, to judge the pressure whether in predetermined pressure limit;Detection well head Temperature, to judge the temperature whether within the scope of predetermined temperature;The hydrogen sulfide content of detection well head, to judge the sulphur Whether change hydrogen content is in predetermined scope.If all in predetermined scope, it may be determined that with setting for lower oil tube of the present invention It is standby to carry out lower oil tube operation.
S2:Double disc open flow device 3 is installed.
Set is installed after the double ram type preventer 3, also includes carrying out pressure testing to the double ram type preventer 3.It is described to double Ram preventer 3 carries out the process of pressure testing can be completed by the hanger plug 20.Specifically, hanger silk of the present invention Stifled 20 screwed connections that can pass through lower end are buckled in the hanger 2, complete connection and sealing, the hanger plug 20 The function of there is closure, pressure testing simultaneously, lifting short circuit.During concrete pressure testing, first close the reducing half and seal flashboard 32 so as to by institute State hanger plug 20 to embrace, realize sealing;Then pressure testing liquid, the pressure testing liquid are squeezed into from the upper end of hanger plug 20 Body is entered in the double ram type preventer 3 by the by-pass prot of the hanger plug 20;When pressure reaches rated pressure, complete Pressure testing.Relative to existing pressure testing mode, during pressure testing, need to remove hanger plug 20, enter pressure-test short joint to try down again For pressure, operation is not only saved, also eliminated pressure-test short joint.
S3:Hanger plug 20 is installed, the hanger plug 20 is above carried, is closed reducing half and is sealed flashboard 32 and reducing slips 31。
During the whole rountrip in oil field, such as before lower oil tube is carried out, it may be necessary to carry out removing oil pumping Bar operation.When rod job is carried out, need that big four 1 and controllable actuating oil-pumping unit device D are installed in well head.For This, in the present invention, when carrying out lower oil tube operation, can by installing the hanger plug 20 on the hanger 2 The reliable closure at hanger 2 is realized, safety removes controllable actuating oil-pumping unit device D and safety installs double disc to guarantee Preventer 3.After closure in pipe is completed to oil pipe C precalculated positions delivery blanking plug, can carry out removing controllable actuating oil-pumping unit The sequence of operations such as equipment.
S4:After removal hanger 2, seal 4 is installed on containing seat 33.
S5:Open reducing half and seal flashboard 32 and reducing slips 31, the first valve 50 at big four 1, carry out open flow.
S6:Play oil pipe.
During operation, the first valve 50 at big four 1 is in opening, and is connected to fluid reservoir 6 by relief line 5; During lower oil tube, double ram type preventer 3 is in opening, as the emergent blowout control equipment of well control, only by the dynamic sealing of seal 4 Pipe box annular space carries out removing for oil pipe.
Due to the matching relationship between the seal 4 and tubing string be dynamic sealing, tubing string during upper carrying can with it is described Seal 4 rubs, so as to produce abrasion to the seal 4.When needing to change the seal 4, close described Reducing half seals flashboard 32.
When there are the emergency episodes such as blowout, first close the reducing half and seal flashboard 32 and reducing slips 31, be then shut off First valve 50.
The process of lower oil tube of the present invention, using the seal 4 annular space is sealed, and is carried out big during rountrip The first valve 50 at four-way 1 carries out annular space open flow in opening, while double ram type preventer 3 is pushed up to prevent going up, without the need for Job platform, convenient working, the individual well activity duration, cost was 3,40,000 or so in operation in 3 days.Remove by force relative to existing For mechanism's lower oil tube operation, operating efficiency is substantially increased, reduce operating cost.
Secondly, operation process seals annular space lower oil tube operation by seal 4, while big four 1 is in opening, when When there are the emergency episodes such as blowout, variable bore ram 32 and reducing slips 31 are turned off, it is safe and reliable.
The foregoing is only several embodiments of the present invention, although disclosed herein embodiment as above, it is but described Content is only to facilitate the embodiment for understanding the present invention and adopting, is not intended to limit the present invention.Belonging to any present invention Those skilled in the art, without departing from disclosed herein spirit and scope on the premise of, can be in embodiment Make any modification and change, but the scope of patent protection of the present invention in form and in details, still must be with appended claims The scope for being defined is defined.

Claims (10)

1. a kind of equipment of lower oil tube, it is characterised in that include:Big four, hanger, hanger plug, double disc blowout prevention Device, seal,
The big four includes the first relative path, alternate path and relative third path, fourth passage, and described first leads to Road is tightly connected with wellhead flange, and the alternate path is tightly connected with the double ram type preventer;The alternate path position Hanger seat is provided with, for hermetically arranging the hanger, in the third path and/or fourth passage open flow is provided with Pipeline, is provided with the first valve on the relief line;
The hanger is in hollow multidiameter, and it forms fluid course between the big four, and it has relative first Auxiliary section and the second auxiliary section, first auxiliary section coordinates with the hanger seat, and second auxiliary section is used for fixing oil Pipe;
The hanger plug, its lower end is sealingly fixed on the hanger;
The double ram type preventer partly seals flashboard including reducing slips, reducing, is connected with receiving the reducing slips up seal Seat;
The seal is arranged in the containing seat, and it is used to be set in oil pipe periphery, realizes the dynamic sealing of oil pipe.
2. the equipment of lower oil tube as claimed in claim 1, it is characterised in that:It also includes fluid reservoir, the relief line One end connects with the third path, and the other end is connected with the fluid reservoir.
3. the equipment of lower oil tube as claimed in claim 2, it is characterised in that:Profit is provided with outside the containing seat and reclaims dress Put, being provided between the oil-water recovering device and the fluid reservoir can connect the oil-water recovering device with the fluid reservoir Draining pipeline.
4. the equipment of lower oil tube as claimed in claim 1, it is characterised in that:The seal is the resilient annular shape of tool Glue core, external diameter of its minimum diameter less than flowline to be risen.
5. the equipment of lower oil tube as claimed in claim 1, it is characterised in that:The equipment total height of the lower oil tube is not high In 550 millimeters.
6. a kind of process of the lower oil tube of the equipment of the lower oil tube based on described in claim 1, it is characterised in that bag Include:
Before entering hanger plug under, blanking plug is delivered into oil pipe, realize closure in pipe;
Double ram type preventer is installed;
Hanger plug is installed, the hanger plug is above carried, is closed reducing half and is sealed flashboard and reducing slips;
Removal hanger, installs seal on containing seat;
Open reducing half and seal flashboard and reducing slips, the first valve, carry out open flow;
Play oil pipe.
7. the process of lower oil tube as claimed in claim 6, it is characterised in that:Blanking plug is delivered into oil pipe, is realized In pipe after closure, also including detection well head pressure, temperature, hydrogen sulfide content.
8. the process of lower oil tube as claimed in claim 6, it is characterised in that:When needing to change the seal, Close the reducing and partly seal flashboard.
9. the process of lower oil tube as claimed in claim 6, it is characterised in that:When there is gas blowout accident, first close The reducing half seals flashboard and reducing slips, is then shut off first valve.
10. the process of lower oil tube as claimed in claim 6, it is characterised in that:After the installation double ram type preventer, Also include carrying out pressure testing to the double ram type preventer.
CN201510387235.5A 2015-06-30 2015-06-30 Device and technological method for pulling lower oil tube CN104975818B (en)

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CN106894774B (en) * 2017-02-17 2019-04-16 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 A kind of underbalance replacement pipe string technology method
CN112267847A (en) * 2018-10-31 2021-01-26 史敏敏 Blowout preventer with sealing performance and oil conveying pipe easy to fix
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CN102359355A (en) * 2011-09-23 2012-02-22 中国石油天然气股份有限公司 Concentric-tube double-tube steam injection wellhead device
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