CN108266149A - The workover process driven using well workover top - Google Patents
The workover process driven using well workover top Download PDFInfo
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- CN108266149A CN108266149A CN201611253243.1A CN201611253243A CN108266149A CN 108266149 A CN108266149 A CN 108266149A CN 201611253243 A CN201611253243 A CN 201611253243A CN 108266149 A CN108266149 A CN 108266149A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000003801 milling Methods 0.000 claims abstract description 230
- 230000006378 damage Effects 0.000 claims abstract description 33
- 230000008439 repair process Effects 0.000 claims abstract description 11
- 241000251468 Actinopterygii Species 0.000 claims description 56
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 208000014674 injury Diseases 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention discloses a kind of workover process driven using well workover top, belong to the well workover technology field of oil/gas well, and workover process includes：When the damage of oil/gas well middle sleeve needs to repair, at least two milling cone short circuits are sequentially connected in series the output terminal driven on well workover top by oil pipe, spacing between two milling cone short circuits of arbitrary neighborhood is more than the length of casing breakage, each milling cone short circuit is cylindrical structure, and the side wall of each milling cone short circuit is equipped with milling face, along the direction driven far from well workover top, the exradius of the cross section at milling face of at least two milling cone short circuits is sequentially reduced；Milling is carried out to casing breakage successively according to the sequence of exradius from small to large using well workover top at least two milling cone short circuits of driving.Since the torque of well workover top drive offer is small, rotating speed is low, the milling direction of milling cone short circuit can be more accurately controlled, the plastic precision of casing is improved, it is therefore prevented that milling tool causes casing to damage the excessive milling of casing.
Description
Technical field
The present invention relates to the well workover technology field of oil/gas well, more particularly to a kind of workover process driven using well workover top.
Background technology
In the development process in oil field, when producing down-hole accident often occurs for oil/gas well, and oil/gas well is made not give birth to normally
Production, can cause scrapping for oil/gas well when serious, therefore, the rapid down-hole accident that handles is to ensure the weight that oil/gas well normally produces
Want measure.
The type of down-hole accident is various, generally comprises card tubing string, trouble of lost tool in hole and casing damage etc., wherein, and with set
Pipe damage is most commonly seen.In casing, the internal diameter of breakage can become smaller, the accident that the big well workover technology of generally use damages casing
It being handled, needs first to arrange overhaul workover rig on well site using the technology, overhaul workover rig is equipped with rotating blade drive,
Then milling cone is mounted on rotating blade drive, milling cone is driven to rotate by rotating blade drive, damaged casing by milling cone
The internal diameter of harm is widened to complete shaping.
In the implementation of the present invention, inventor has found that the prior art has at least the following problems：
During due to the use of the larger rotating blade drive of power, the milling speed of milling cone installed on rotating blade drive compared with
Soon, when casing breakage carries out milling operation, milling cone easily shifts and excessive wear is caused to casing wall, makes casing wall
Thinning or even worn out casing.
Invention content
It is larger in order to solve the power of rotating blade drive, the milling speed mistake for the milling cone installed on rotating blade drive
Soon, the problem of milling cone easily shifts and causes secondary injury to casing wall, an embodiment of the present invention provides a kind of utilize to repair
The workover process that Jing Ding drives.The technical solution is as follows：
An embodiment of the present invention provides a kind of workover process driven using well workover top, the workover process includes：
Well workover top is set to drive on the well site of oil/gas well；
When oil/gas well middle sleeve damage needs to repair, at least two milling cone short circuits are sequentially connected in series by oil pipe
In the lower contact that the well workover top is driven, the spacing between two milling cone short circuits of arbitrary neighborhood is more than described sleeve pipe breakage
Length, each milling cone short circuit is cylindrical structure, and the side wall of each milling cone short circuit is equipped with milling face, edge
Far from the direction that the well workover top is driven, the exradius of the cross section at the milling face of at least two milling cones short circuit
It is sequentially reduced, the exradius difference of the two neighboring milling cone short circuit is 1mm, and the length of each milling cone short circuit is 60cm-
80cm, and the length in the milling face on the milling cone short circuit is 30cm-50cm；
At least two milling cones short circuit is driven according to the exradius from small to large suitable using the well workover top
Sequence carries out milling to described sleeve pipe breakage successively.
Further, the workover process further includes：
Before at least two milling cones short circuit is mounted in the lower contact driven on the well workover top, first by pen tip milling cone
In the lower contact driven mounted on the well workover top, the pen tip milling cone is put into the breakage of described sleeve pipe, and is repaiied described in control
Jing Ding drives the pen tip milling cone to carry out milling to described sleeve pipe breakage.
Further, it is described to repair after carrying out milling to described sleeve pipe breakage by at least two milling cone short circuits
Well technique further includes：
The method taken machinery or fired is sealed reinforcing to described sleeve pipe breakage.
Further, if the least radius of the breakage of described sleeve pipe be less than 108mm, control well bit pressure in 8KN hereinafter,
And the control well workover top driving force station pump pressure is in 9 ± 3Mpa；
If the least radius of the breakage of described sleeve pipe is greater than or equal to 108mm, well bit pressure is controlled between 8-10KN,
And the control well workover top driving force station pump pressure is in 9 ± 3Mpa.
Further, the selection range of the outside diameter of the milling cone short circuit is Φ 95mm- Φ 124mm.
Further, the length of each milling cone short circuit is 60cm, and the length in the milling face on the milling cone short circuit is
30cm。
Further, the both ends of the milling cone short circuit are respectively provided with the helicitic texture being connect with the oil pipe.
Further, the workover process further includes：
When fish is salvaged under needing to the oil/gas well,
If the top breakage of the fish needs to repair, the efficient flat mill of installation in the lower contact of well workover top drive
The efficient flat-bottom grind shoes are put into the oil/gas well by footwear, are driven with the well workover top and are driven the efficient flat-bottom grind shoes to institute
State fish top carry out milling after, then by fishing tool the fish is pulled out；
If desired reduce the outer diameter of the fish, casing section mill is installed in the lower contact driven on the well workover top, by the set
Milling cylinder is put into the oil/gas well, after the casing section mill being driven to carry out set milling to the outer wall of the fish with the well workover top,
The fish is pulled out by fishing tool again；
If the fish top has movable junk, casing section mill is installed in the lower contact of well workover top drive, by the set
Milling cylinder is put into the oil/gas well, the casing section mill is driven to carry out set milling to the movable junk with the well workover top, by institute
It states after movable junk grinds, then pulled out the fish by fishing tool.
Further, when milling or set milling are carried out to the junk, control well bit pressure is in 12KN hereinafter, and being repaiied described in control
Well top driving force station pump pressure is 8 ± 1Mpa.
Further, when carrying out set milling to the movable junk, control well bit pressure is in 15KN hereinafter, and the control well workover
It is 6 ± 1Mpa to push up driving force station pump pressure.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：The casing damaged in oil/gas well is repaiied
When multiple, at least two milling cone short circuits and the drive of well workover top are connected, at least two milling cone short circuits pass sequentially through oil pipe and are connected, along separate
The direction that well workover top is driven, the exradius of the cross section at milling face of at least two milling cone short circuits is sequentially reduced, by repairing
Jing Ding driving milling cone short circuit rotations, multiple milling cone short circuits carry out milling to casing breakage successively, due to being driven using well workover top
The torque of offer is small, and when carrying out milling according to the larger milling cone in milling face, it is stuck to be easy to cause milling cone, using milling face length
Shorter milling cone short circuit carries out milling, and at least two milling cone short circuits carry out milling, the power needed for milling to casing breakage successively
Square is smaller, and there is a situation where stuck when preventing milling, and to drive the rotating speed provided low due to well workover top, in the casing to damage
Speed is slower during progress milling reparation, can more be accurately controlled the milling direction of milling cone short circuit, the plastic precision of casing obtains
Raising is arrived, it is therefore prevented that milling tool causes casing to damage the excessive milling of casing.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the present of invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the flow chart of the workover process of repairing casing damage provided in an embodiment of the present invention driven using well workover top；
Fig. 2 is the structure diagram of milling cone short circuit provided in an embodiment of the present invention；
Fig. 3 is that milling cone short circuit provided in an embodiment of the present invention is connected to the structure diagram that well workover top is driven；
Structure diagram when Fig. 4 is the short circuit repairing casing provided in an embodiment of the present invention by milling cone；
Fig. 5 is the flow chart provided in an embodiment of the present invention that the workover process for salvaging fish is driven using well workover top；
Structure diagram when Fig. 6 is the reparation fish top provided in an embodiment of the present invention by efficient flat-bottom grind shoes；
Structure diagram when Fig. 7 is the milling fish outer wall provided in an embodiment of the present invention by casing section mill；
Structure diagram when Fig. 8 is the milling fish top activity junk provided in an embodiment of the present invention by casing section mill.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
There is breakage after being often as casing aging or corrosion in casing damage in common oil/gas well, causes on casing
Stress changes and forms torsional deformation, the internal diameter of casing can be caused to become smaller after casing torsional deformation, so as to influence oil/gas well
Production.When oil gas casing damages, provided in an embodiment of the present invention a kind of repaiied using what well workover top was driven may be used
Well technique repairs the casing of damage, Fig. 1 be it is provided in an embodiment of the present invention utilize well workover top drive repairing casing damage
The flow chart of workover process, referring to Fig. 1, which includes：
Step 101：Well workover top is set to drive on the well site of oil/gas well.
It is a kind of drilling rig of top drive that well workover top, which is driven, connects workover tool below the drive of well workover top, passes through well workover
Driving workover tool rotation in top constructs to underground, and well workover top, which is driven, has the advantages such as easy to operate and rotating speed is controllable, and
The power that well workover top is driven is smaller, and the speed of milling is slower, milling more controllable precise, and well workover top, which is driven, can pass through light maintenance well workover
Machine is mounted on the well site of oil/gas well, casing is repaired compared to using overhaul workover rig, light maintenance workover rig floor space
Small, flexibility during use is higher.
Step 102：At least two milling cone short circuits are mounted on to the output terminal driven on well workover top.
Fig. 2 is the structure diagram of milling cone short circuit provided in an embodiment of the present invention, and referring to Fig. 2, milling cone short circuit 2 is for covering
The specific purpose tool of pipe diameter enlarging, milling cone short circuit 2 is cylinder, and the side wall of milling cone short circuit 2 is equipped with milling face 2a, in milling cone short circuit
2 both ends are respectively arranged with the external screw thread 2b being connected with oil pipe and internal thread 2c, will when milling cone short circuit 2 is used to carry out milling
Milling cone short circuit 2 is connected on oil pipe, and oil pipe is connected to the output terminal of well workover top drive, and it is short by 2 to drive driving milling cone by well workover top
It connects rotation and carries out milling.The length of each milling cone short circuit can be 60cm-80cm, and the length in the milling face on milling cone short circuit can
Think 30cm-50cm.Preferably, the length of single milling cone short circuit is 60cm, and the length in the milling face on single milling cone short circuit is
30cm.The length may further ensure that the effect of milling.
Fig. 3 is that milling cone short circuit provided in an embodiment of the present invention is connected to the structure diagram that well workover top is driven, referring to Fig. 3,
Using at least two milling cone short circuits 2 in the present embodiment, at least two milling cone short circuits 2 are serially connected in well workover top by oil pipe and drive 1
In lower contact, the spacing between two milling cone short circuits 2 of arbitrary neighborhood is more than the length of casing breakage, is driven along far from well workover top
1 direction, the exradius of the cross section at the 2a of milling face of at least two milling cone short circuits 2 are sequentially reduced, and two neighboring
The exradius difference of milling cone short circuit is 1mm.In the present embodiment, lower-powered feature is driven according to well workover top, it is corresponding to use
At least two milling cone short circuits are as workover tool, since the driving device as workover tool, well workover top are driven in the well workover top of use
The power of drive is smaller compared to the power of the driving device in overhaul workover rig, and milling, milling face are carried out using milling cone short circuit
Length is shorter, need well workover top drive provide turning moment it is relatively low, ensure that the success rate of milling, it is therefore prevented that using milling face compared with
When big milling cone carries out milling, the phenomenon that well workover top driving force deficiency causes milling cone stuck.
The selection range of the outside diameter of milling cone short circuit can be Φ 95mm- Φ 124mm, be adapted to existing casing ruler
It is very little.
Step 103：Using well workover top at least two milling cone short circuits of driving according to exradius sequence from small to large according to
It is secondary that milling is carried out to casing breakage.
Structure diagram when Fig. 4 is the short circuit repairing casing provided in an embodiment of the present invention by milling cone, referring to Fig. 4,
To that before being repaired at casing damage, can be measured by beating lead stamp, lower the test equipment such as modes such as 16 arm logging instruments
The casing radius of specific length and casing breakage at casing damage, the length of the oil pipe 3 of use need to be more than casing damage
Locate the length of a, in this way, only milling is carried out to a at casing damage there are one milling cone short circuit 2 every time, when a milling cone short circuit 2 is complete
Milling is carried out to a at casing damage by a at casing damage and then with the adjacent milling cone short circuit 2 in its top.And adjacent two
Radius is sequentially increased the exradius of the cross section at the 2a of milling face of a milling cone short circuit 2 from bottom to up, it is achieved that logical
Cross step by step shaping of multiple milling cone short circuits 2 to a at casing damage, specifically, adjacent two milling cone short circuits 2 in milling face 2a
The exradius difference of the cross section at place is 1mm, i.e., after often carrying out milling to a at casing damage using a milling cone short circuit 2, set
The radius increase 1mm of pipe injury region a, increases the precision of milling in this way, and continuously increasing mill by way of milling step by step
The efficiency of milling.
In general, the exradius of the cross section positioned at the milling cone short circuit of bottom at milling face used is arrived for 109mm
When radius at casing damage is less than 108mm, the milling cone short circuit of bottom can be caused to be difficult to pass through, when by playing lead stamp, lower survey
The radius that the modes such as test instrument measure at casing damage is less than 108mm, can also first pass through pen tip milling cone in casing breakage
Milling is carried out, the radius at casing damage is made to reach 108mm, then by milling cone short circuit successively to carrying out milling at casing wear,
Specifically, pen tip milling cone can be mounted on well workover top by oil pipe to drive in lower contact, pen tip milling cone is put into oil/gas well, is led to
The driving pen tip milling cone rotation of well workover top is crossed, milling is carried out by pen tip milling cone at casing wear, until pen tip milling cone will cover
It after the radius milling to 108mm of pipe injury region, is removed after pen tip milling cone is taken out, then installation milling cone is short below the drive of well workover top
It connects.
In the present embodiment, it if the least radius of casing breakage is deformed into less than 108mm, at this moment needs that well is controlled to bore
8KN is pressed in hereinafter, and controlling well workover top driving force station pump pressure in 9 ± 3Mpa；If the least radius deformation of casing breakage is more than
Or during equal to 108mm, at this moment need to control well bit pressure between 8-10KN, and control well workover top driving force station pump pressure 9 ±
3Mpa.Wherein, well bit pressure is bigger, and the speed of milling tool milling is faster.When casing deformation is larger, bored using smaller well
Pressure is to ensure the precision of milling, when casing deformation is smaller, can increase milling speed using larger well bit pressure, improve milling
Efficiency.
After step 103, after carrying out milling to casing by milling cone short circuit, take machinery or the method that fires is to logical
Casing at road is sealed reinforcing.Specifically, mechanical method can transfer internal lining pipe or using water in casing breakage
Mud carries out the mode of repairing etc., can also be sealed the injury region of casing by the way of firing directly at casing damage and add
Gu.
When being repaired to the casing damaged in oil/gas well, at least two milling cone short circuits with well workover top are driven and are connected, at least
Two milling cone short circuits pass sequentially through oil pipe and are connected, along far from well workover top drive direction, at least two milling cone short circuits in milling face
The exradius of the cross section at place is sequentially reduced, and is rotated by well workover top driving milling cone short circuit, multiple milling cone short circuits are right successively
Casing breakage carries out milling, since the torque that offer is driven using well workover top is small, is ground according to the larger milling cone in milling face
During milling, be easy to cause that milling cone is stuck, milling carried out using the shorter milling cone short circuit of milling face length, at least two milling cone short circuits according to
Secondary to carry out milling to casing breakage, the torque needed for milling is smaller, there is a situation where stuck when preventing milling, and due to well workover
The rotating speed that offer is driven on top is low, therefore when the casing to damage carries out milling reparation, speed is slower, can more be accurately controlled
The milling direction of milling cone short circuit, the plastic precision of casing are improved, it is therefore prevented that milling tool to the excessive milling of casing and
Casing is caused to damage.
In the present embodiment, a kind of workover process handled underground fish is additionally provided, it is common under oil/gas well
Fish be the oil pipe to come off, during oil pipe is used for a long time, the interface of oil pipe easily corrodes, and causes oil pipe loose
It moves and comes off, when being salvaged to fish under oil/gas well, Fig. 5 is that provided in an embodiment of the present invention driven using well workover top salvages fish
Workover process flow chart, referring to Fig. 5, workover process includes：
Step 201：Well workover top is set to drive on the well site of oil/gas well.
Step 202a：If the top breakage of fish needs to repair, driven with well workover top and drive efficient flat-bottom grind shoes to fish
After top carries out milling.
When carrying out salvaging fish, the top of fish may occur damaged and irregular, and fish is caused to be difficult to salvage.Figure
6 be it is provided in an embodiment of the present invention by efficient flat-bottom grind shoes repair fish top when structure diagram, referring to Fig. 6, if falling
The top breakage of fish b needs to repair, and is driven on well workover top in 1 lower contact and installs efficient flat-bottom grind shoes 4, by efficient flat-bottom grind shoes 4
It is put into oil/gas well, drive the 1 efficient flat-bottom grind shoes 4 of driving with well workover top carries out milling to the top of fish b.
Step 202b：If desired reduce the outer diameter of fish, the outer wall of fish is covered with well workover top driving casing section mill
Milling.
When carrying out salvaging fish, the top of fish may be because that the reasons such as corrosion lead to fish top failure by rupture, make
The top outer diameter of fish becomes larger, before being salvaged by fishing tool, need by the top radius of fish mill it is small after to salvage.Figure
7 structure diagram when being the milling fish outer wall provided in an embodiment of the present invention by casing section mill referring to Fig. 7, if desired reduces
During the outer diameter of fish b, casing section mill 5 is installed in the lower contact that 1 is driven on well workover top, and casing section mill 5 is put into oil/gas well, is driven with well workover top
1 driving casing section mill 5 carries out set milling to the outer wall of fish b.
It should be noted that before salvaging fish is carried out, lead stamp can be first passed through, stamp is carried out to the top of fish, led to
Stamp is crossed to judge whether to need to carry out fish milling or set milling.
In the present embodiment, when milling or set milling are carried out to junk, control well bit pressure is in 12KN hereinafter, and control well workover top
Driving force station pump pressure is 8 ± 1Mpa.
Step 202c：If fish top has movable junk, drive driving casing section mill with well workover top and set milling carried out to movable junk,
Movable junk is ground.
It when carrying out salvaging fish, is also possible to have some fritter activity junks at the top of fish, these movable junks are led
Causing the top position of fish cannot clearly see, and fish is caused to be difficult to salvaged tool and is salvaged.Fig. 8 is that the embodiment of the present invention carries
Supply by casing section mill milling fish top activity junk when structure diagram, if as shown in figure 8, fish b at the top of have activity
It during junk c, is driven on well workover top and casing section mill 5 is installed in 1 lower contact, casing section mill 5 is put into oil/gas well, driven 1 with well workover top and drive
Dynamic casing section mill 5 carries out set milling to movable junk c, and after movable junk c is ground, the top for making fish b is high-visible.
In the present embodiment, when carrying out set milling to movable junk, control well bit pressure is in 15KN hereinafter, and control well workover top drive
Power station pump pressure is 6 ± 1Mpa.
Step 203：Fish is pulled out by fishing tool.
In the present embodiment, left hand fishing spear can be made by salvaging the fishing tool that fish uses, and left hand fishing spear is passed through oil pipe
It is connected to well workover top to drive upper and stretch into underground, underground fish is salvaged.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of workover process driven using well workover top, which is characterized in that the workover process includes：
Well workover top is set to drive on the well site of oil/gas well；
When oil/gas well middle sleeve damage needs to repair, at least two milling cone short circuits are sequentially connected in series by oil pipe described
In the lower contact that well workover top is driven, the spacing between two milling cone short circuits of arbitrary neighborhood is more than the length of described sleeve pipe breakage
Degree, each milling cone short circuit is cylindrical structure, and the side wall of each milling cone short circuit is equipped with milling face, along separate
The direction that the well workover top is driven, the exradius of the cross section at the milling face of at least two milling cones short circuit is successively
Reducing, the exradius difference of the two neighboring milling cone short circuit is 1mm, and the length of each milling cone short circuit is 60cm-80cm,
And the length in the milling face on the milling cone short circuit is 30cm-50cm；
Using the well workover top drive at least two milling cones short circuit according to exradius sequence from small to large according to
It is secondary that milling is carried out to described sleeve pipe breakage.
2. workover process according to claim 1, which is characterized in that the workover process further includes：
Before at least two milling cones short circuit is mounted in the lower contact driven on the well workover top, first pen tip milling cone is installed
In the lower contact driven on the well workover top, the pen tip milling cone is put into the breakage of described sleeve pipe, and control the well workover top
The pen tip milling cone is driven to carry out milling to described sleeve pipe breakage.
3. workover process according to claim 1 or 2, which is characterized in that by at least two milling cone short circuits to institute
After stating the progress milling of casing breakage, the workover process further includes：
The method taken machinery or fired is sealed reinforcing to described sleeve pipe breakage.
4. workover process according to claim 1 or 2, which is characterized in that
If the least radius of the breakage of described sleeve pipe is less than 108mm, control well bit pressure is in 8KN hereinafter, and being repaiied described in control
Well top driving force station is pumped in 9 ± 3Mpa；
If the least radius of the breakage of described sleeve pipe is greater than or equal to 108mm, control well bit pressure is controlled between 8-10KN
The well workover top driving force station pump pressure is made in 9 ± 3Mpa.
5. workover process according to claim 1 or 2, which is characterized in that the selection of the outside diameter of the milling cone short circuit
Ranging from Φ 95mm- Φ 124mm.
6. workover process according to claim 5, which is characterized in that the length of each milling cone short circuit is 60cm, institute
The length for stating the milling face on milling cone short circuit is 30cm.
7. workover process according to claim 1 or 2, which is characterized in that the both ends of the milling cone short circuit are respectively equipped with use
In the helicitic texture being connect with the oil pipe.
8. workover process according to claim 1, which is characterized in that the workover process further includes：
When fish is salvaged under needing to the oil/gas well,
If the top breakage of the fish needs to repair, efficient flat-bottom grind shoes are installed in the lower contact of well workover top drive, it will
The efficient flat-bottom grind shoes are put into the oil/gas well, are driven with the well workover top and are driven the efficient flat-bottom grind shoes to the fish
Top carry out milling after, then by fishing tool the fish is pulled out；
If desired reduce the outer diameter of the fish, casing section mill is installed in the lower contact driven on the well workover top, by the casing section mill
It is put into the oil/gas well, after the casing section mill being driven to carry out set milling to the outer wall of the fish with the well workover top, then leads to
Fishing tool is crossed to pull the fish out；
If the fish top has movable junk, casing section mill is installed in the lower contact of well workover top drive, by the casing section mill
It is put into the oil/gas well, the casing section mill is driven to carry out set milling to the movable junk with the well workover top, by the work
After dynamic junk is ground, then by fishing tool the fish is pulled out.
9. workover process according to claim 8, which is characterized in that when milling or set milling are carried out to the junk, control
Well bit pressure is in 12KN hereinafter, and the control well workover top driving force station pump pressure is 8 ± 1Mpa.
10. workover process according to claim 8, which is characterized in that when carrying out set milling to the movable junk, control well
Bit pressure is in 15KN hereinafter, and the control well workover top driving force station pump pressure is 6 ± 1Mpa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611253243.1A CN108266149B (en) | 2016-12-30 | 2016-12-30 | Well workover process utilizing well workover top drive |
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| CN201611253243.1A CN108266149B (en) | 2016-12-30 | 2016-12-30 | Well workover process utilizing well workover top drive |
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| CN108266149A true CN108266149A (en) | 2018-07-10 |
| CN108266149B CN108266149B (en) | 2021-01-29 |
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| CN (1) | CN108266149B (en) |
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