CN100575659C - A kind of insufficient balance well completion method - Google Patents

A kind of insufficient balance well completion method Download PDF

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Publication number
CN100575659C
CN100575659C CN200510080242A CN200510080242A CN100575659C CN 100575659 C CN100575659 C CN 100575659C CN 200510080242 A CN200510080242 A CN 200510080242A CN 200510080242 A CN200510080242 A CN 200510080242A CN 100575659 C CN100575659 C CN 100575659C
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CN
China
Prior art keywords
tubing string
completion
insufficient balance
tube
expansion
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Expired - Fee Related
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CN200510080242A
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Chinese (zh)
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CN1891974A (en
Inventor
谢正凯
吴仕荣
陈刚
伍贤柱
王忠生
王玉明
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Institute Of Science And Technology China Petroleum Group
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Institute Of Science And Technology China Petroleum Group
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Priority to CN200510080242A priority Critical patent/CN100575659C/en
Publication of CN1891974A publication Critical patent/CN1891974A/en
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Publication of CN100575659C publication Critical patent/CN100575659C/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses method and completion system that a kind of insufficient balance well completion is used, this device is for round tubular, and two ends are provided with the section of being threaded, and the tube wall middle part is provided with some axial grooves.This device produces plastic strain by the expanded downhole instrument, is adjacent on the borehole wall.Make the middle part axial groove become through hole after tube wall expands simultaneously, make and manage inside and outside the perforation, play the effect of screen pipe.Do not need well cementing of cement in the work progress, so can under insufficient balance condition, carry out cement operations, running string and get through reservoir.Utilizing this device can be implemented in completion under the real insufficient balance condition, is a kind of insufficient balance well completion device that is applicable under the multiple geological conditions.Reach the science completion, protection oil-gas Layer, the purpose of raising oil and gas production.

Description

The insufficient balance well completion method
Affiliated technical field:
The present invention relates to oil oil gas well drilling, completion technique field, relate to a kind of completion method and used device.Be particularly related to a kind of method of insufficient balance well completion and adopt the employed insufficient balance well completion device of this method.
Background technology
In the exploration and exploitation of oil gas field, conventional drilling technology all belongs to the overbalance drilling well, when both particularly opening reservoir in drilling process, makes the pressure of drilling fluid in the well be higher than reservoir pore space pressure, prevents blowout.Conventional overbalance drilling technology is because the pressure of shaft bottom drilling fluid is higher than formation pore pressure, and drilling fluid enters reservoir under the effect of pressure reduction like this, stops up, damages and the pollution reservoir.Reservoir pore space is blocked, and oil gas can not flow to pit shaft smoothly or the outflow ability reduces, and causes oil and gas production to reduce.If the well that is bored is an exploratory well, the purpose of drilling well is to understand this area whether to have the oil-containing reservoir, yet the exploratory well reservoir pore space is blocked, can not in time find reservoir, consequence then is to cause the oil reservoir in a reservoir and even an area to be judged as no recverable oil, loses valuable oil reservoir.
The 1950's, begin to adopt under-balanced drilling technology.Under-balanced drilling technology is: the drilling fluid bottom pressure is lower than formation pore pressure in drilling process, makes the fluid of reservoir controlledly enter pit shaft under differential pressure action, and the circulation of fluid of reservoir is arrived a kind of drilling technology on ground.
Overbalance drilling technology with routine is compared, and under-balanced drilling technology has many good qualities, and mainly shows as: (1) reduces drilling fluid to reservoir damage caused, raising oil and gas production.In the under balance pressure drilling process, because of the shaft bottom drilling liquid pressure is lower than reservoir pore space pressure, drilling fluid can not enter reservoir, and the reservoir inner fluid flows into pit shaft on the contrary.So under balance pressure drilling reduces reservoir damage caused, can protect oil-gas Layer effectively, thereby improve the oil gas well yield.(2) help finding, thinking poorly of and force down the oil impregnate gas-bearing formation.Conventional overbalance drilling well damages reservoir, stops up reservoir pore space, and the well that oil should be arranged is not shown, influences the exploration and the exploitation of oil gas.The fluid pressure of under balance pressure drilling process reservoir is higher than the pressure of shaft bottom drilling fluid, and reservoir hydrocarbons can enter pit shaft and go out ground from the well internal return, helps reservoir hydrocarbons is made accurate evaluation.(3) under balance pressure drilling can increase substantially rate of penetration, prolongs drilling life of bit.(4) because the head of liquid of the interior drilling fluid of under balance pressure drilling pit shaft is lower than formation pore pressure, thereby can reduce the drilling fluid leakage odds greatly, reduce drilling fluid and run off, reduce drilling cost.(5) in the under balance pressure drilling process, may produce oil gas, be used and sell by oil gas being separated as byproduct.
Because the geological conditions more complicated of oil gas well causes the obstruction of pit shaft or blocks oil production equipment in the oil gas well for preventing cave-in, after finishing drilling well, need carry out completion to the pit shaft borehole wall usually and handle.Present completion method is: in being filled into cement paste between annular between the sleeve pipe and the borehole wall, cement paste is solidificated between the sleeve pipe and the borehole wall.Promptly the borehole wall is carried out consolidation process by cement.The cement paste solidifying requirements has a stable underground environment, just the usually said steady principle of pressure of engineers and technicians.Under the insufficient balance condition of down-hole, the fluid in the stratum is in state of activation, in the oil in the reservoir, gas, the water intrusion cement paste, causes cement paste weightlessness.Cement paste loses the difficult curing of stable underground environment, and the completion quality can not get guaranteeing, influences the interlayer packing, does not reach the purpose of completion.In addition, because of the cement grout column pressure is higher than the shaft bottom reservoir pressure, the pollution damage reservoir effect that can cause conventional overbalance drilling well to bring again.What pollute the infringement reservoir in the completion process is cement paste.Cement paste is to the extent of damage of oil gas well even the infringement that causes above the overbalance drilling well.Therefore, after present under balance pressure drilling was finished, the cased hole completion method that does not adopt cement paste to fill generally adopted barefoot completion or sieve tube completion.And these two kinds of completion methods are handled owing to not carrying out stabilizing borehole, so can only be used for rock stratum densification, the stable geological conditions of pit shaft, the scope of application is limited to.And sieve tube completion is just can carry out under overbalanced conditions equally, and sieve tube completion still can not overcome the infringement of cement paste to the oil gas well.Up till now, do not have a kind of insufficient balance well completion technology that matches with under balance pressure drilling, make the oil-gas Layer that under under-balanced drilling technology, is protected in the completion process, continue to be protected.If can not realize underbalance in drilling well, well logging, completion construction overall process, the effect of under-balanced drilling technology protection oil-gas Layer just can not demonstrate fully, and the purpose of protection oil-gas Layer is not final to be realized.
Summary of the invention:
Completion technique at present employing can not realize protecting oil-gas Layer, and the purpose of protection oil-gas Layer does not have the final problem that realizes in the under-balanced drilling technology, has proposed the insufficient balance well completion technology.The purpose of this invention is to provide a kind of insufficient balance well completion method; be implemented in and carry out insufficient balance well completion under the various geological conditionss; to guarantee in whole drilling well, completion process, not causing damage protection oil-gas Layer, the accuracy of raising oil well output and exploration, assessment to reservoir.
Another object of the present invention is: the completion system that provides a kind of insufficient balance well completion to use, implement will be placed in this device in the well wellbore in the insufficient balance well completion.
The object of the present invention is achieved like this:
The completion system that insufficient balance well completion is used: this device is a kind of round tube, and the external diameter of round tube is between the 127-203 millimeter, and thickness is between the 6-12 millimeter, and length is between 7-13 rice.There is the section of being threaded at the round tube two ends, and are evenly equipped with axial groove around the round tube central tube wall surface, and the degree of depth of axial groove is between the 3-11 millimeter.Round tube is transferred to the down-hole, make round tube produce the expansion plastic strain by the expanded downhole instrument.After round tube expanded, the tube wall diameter increased; Axial groove becomes approximate diamond hole, can make round tube be adjacent to the effect that realizes stabilizing borehole on the borehole wall.
For round tube can firmly be connected, there is the section of being threaded at described round tube two ends, and round tube one end is an internal thread, and an end is an external screw thread.
Convenient in order to adapt to the insufficient balance well completion constructing operation, described internal thread and external screw thread are left hand thread.
In order to be fit to more to help making round tube to expand in the insufficient balance well completion construction, the external diameter of the section of being threaded at described round tube two ends is greater than middle part tube wall external diameter 5-40 millimeter.
Axial groove has multiple shape, be circular rectangle etc. as rhombus, ellipse, rectangle, two ends, and optimal shape is the rectangle axial groove.The easier homogeneous deformation when expanding of this axial groove structure makes axial groove be expanded into the rhombus through hole, and required active force is little when expanding, and the shape of the through hole of formation is regular.
Axial groove can be positioned on the inwall or outer wall of round tube, and for easy to process, axial groove is relatively good on the outer wall of round tube.So not only be convenient to the processing of axial groove, and the round tube inner wall surface is smooth, be convenient to expander in the down-hole to the round tube reprocessing of expanding.
Insufficient balance well completion method provided by the invention is: after finishing under balance pressure drilling, utilize under balance pressure drilling equipment, condition, as derrick, rig, preventer, not kill-job tripping assembly, expander, and the employed drilling fluid of under balance pressure drilling, carry out the insufficient balance well completion construction.The insufficient balance well completion job practices is:
A, under insufficient balance condition, utilize rig in pit shaft, to put into the expansion tube tubing string of lower end closed.The expansion tube tubing string is formed: the completion system, the extension hanger that have sealing tube head, insufficient balance well completion to use from bottom to up, the expansion tube tubing string adopts and is threaded.With sending into tubing string the expansion tube tubing string is lowered to oil and gas reservoir.The completion system that insufficient balance well completion is used adopts round tube, is interconnected by left hand thread by the section of being threaded to form.
In the expansion tube tubing string is gone into the well process, if the thrust sum that the deadweight that expands the pipe tubing string and send into tubing string is gushed out less than tubing string buoyancy and well liquid, when the tubing string come-up takes place, adopt not kill-job tripping assembly to press down by force, with the expansion tube tubing string with send into tubing string and be pressed in the pit shaft.Downforce is between the 0-10 ton.
Extension hanger hangs the expansion tube tubing string and is fixed on well inner sleeve lower end; Trip out and send into tubing string.In the expansion tube tubing string is gone into the well process, whenever be lowered to 30-100 rice, toward sending into Under-balanced drilling fluid of perfusion in the tubing string, reduce expansion tube tubing string inside and outside differential pressure.The sealing tube head can stop the downhole in reservoir fluid to enter in the expansion tube tubing string.
B, under insufficient balance condition, utilize rig in the expansion tube tubing string, to be lowered to expander.Expander is conical, and transfer roller is arranged on every side.Rotary table for drilling machine drives expander to right rotation.Direction of rotation is opposite with the expansion tube tubing string section of being threaded screw thread rotation direction, threads off to prevent screw thread.Utilize the weight of expander and top drilling tool to advance expander downwards.Propulsive force is between the 1-8 ton downwards.The completion system inwall that transfer roller on the expander is used insufficient balance well completion applies expanded radially pressure.Have the round tube expanded radially of axial groove.The tube wall of the round tube after the expansion is adjacent to and realizes the stabilizing borehole effect on the borehole wall.The axial groove on the completion system round tube surface that the while insufficient balance well completion is used is lower because of intensity, cracks and be inflated device, and axial groove is cracked the through hole of diamondwise, makes round tube become well screen.The expansion tube tubing string is inside and outside to connect, and promptly connects reservoir.
In order to be lowered to instruments such as other oil recovery, well workover smoothly after the completion,, to the processing of expanding of the arrival end of expansion tube tubing string, to make it form taper shape and enter the mouth by expander smoothly by the junction of expansion tube tubing string with the well inner sleeve.
By expander rotation, and advance downwards, the tubing string after the expansion is adjacent on the borehole wall of pit shaft the processing of expanding of exerting pressure of expansion tube tubing string tube wall; Can not be adjacent on the borehole wall of pit shaft by the well bore designing requirement yet.
Under C, the underbalance condition, utilize rig to trip out expander and top drilling tool thereof.The completion system that insufficient balance well completion after the expansion is used is stayed in the well.Finish the overall process of insufficient balance well completion.
In the whole completion work progress, all under under-balanced state, finish; The drilling fluid that uses is a Under-balanced drilling fluid.Therefore there are not infringement, pollution to petroleum reservoir.Realized in the completion process, continuing the oil-gas Layer that under under-balanced drilling technology, is protected to be effectively protected.
Effect of the present invention: the invention provides a kind of brand-new completion method and device, be implemented in insufficient balance condition and be lowered to completion tubular column.Do not adopt high pressure water injection mud in the work progress, so can under insufficient balance condition, carry out well completion operations.The axial groove back of expanding is become the through hole of approximate rhombus by expansion, and completion tubular column is inside and outside to connect, and makes round tube after the expansion play the screen casing effect of sand control, filter sand.The present invention can realize that reservoir and pit shaft connect under the situation of perforation.Reduce the oil well perforation link, saved the oil well perforation cost, overcome the infringement that the perforation process is brought to reservoir.The completion system that this insufficient balance well completion is used can be realized the completion under the insufficient balance condition, is a kind of insufficient balance well completion device that goes under the various geological conditionss.Can not cause damage, protect oil-gas Layer, can improve the oil well well yield, can improve the accuracy of exploration, evaluation of earth formations oil-containing situation reservoir.In a word, adopt completion of the present invention, do not pollute oil reservoir, solved for many years those skilled in the art and wanted to solve, and unsolved technical task; The oil and gas reservoir that under under-balanced drilling technology, is protected, the purpose that in the completion process, continues to be protected have been realized.
Description of drawings:
Accompanying drawing 1 is the completion system structural profile schematic diagram that insufficient balance well completion of the present invention is used.Be an embodiment, can not be interpreted as that the completion system that insufficient balance well completion of the present invention is used only has this structure.
Accompanying drawing 2 is to adopt insufficient balance well completion to carry out the insufficient balance well completion operation chart with completion system.The completion system that utilizes expander (6) that insufficient balance well completion is used in the down-hole processing of expanding, the schematic diagram that round tube (2) is expanded.
Accompanying drawing 3 is oil well vertical section schematic diagrames of finishing after round tube (2) expands.Be that a kind of round tube (2) is adjacent to the schematic diagram on the borehole wall (7).
Accompanying drawing 4 is schematic cross section of accompanying drawing 1.Axial groove (4) cross section structure before the expression insufficient balance well completion expands with completion system.
Accompanying drawing 5 is the cross sectional representation after insufficient balance well completion expands with completion system.Expression round tube internal diameter, external diameter increase, and axial groove (4) becomes through hole.
Among the figure, 1. external screw thread, 2. round tube, 3. axial groove, 4. internal thread, 5. tube ends, 6. expander, the 7. borehole wall, the 8. section of being threaded, 9. sealing tube head.
The specific embodiment
The completion system of insufficient balance well completion method of the present invention and insufficient balance well completion being used below in conjunction with the drawings and specific embodiments is described further.
Embodiment:
The completion system that insufficient balance well completion is used, as shown in Figure 1, round tube (2) is a steel pipe, and an end has external screw thread (1), and the other end has internal thread (3).The external diameter of round tube (2) is 127 millimeters, and thickness is 10 millimeters, and length is 10 meters.Round tube (2) middle part outer surface of tube wall is staggered to be evenly equipped with axial groove (4), and the degree of depth of axial groove (4) is 9 millimeters, and the length of axial groove (4) is 300 millimeters.What axial groove (4) adopted is that two ends are circular rectangle.Axial groove (4) is positioned on the outer wall of round tube (2).Can adopt milling machine processing axial groove (4).Round tube (2) both ends diameter is greater than 13 millimeters of central tube diameters, and promptly the both ends diameter is 140 millimeters.The uniform axial groove (4) of described round tube (2) middle part tube wall external surface peripheral, its arrangement mode is for being staggered.
As shown in Figure 4, the distance between the inner surface of axial groove (4) bottom and tube wall, promptly wall thickness thinnest part intensity should guarantee can bear the inside and outside pressure differential of pipe under the insufficient balance condition of shaft bottom.Round tube (2) can not be out of shape under this pressure differential effect, and axial groove (4) can not break automatically because of pressurized.
Because the existing expander of drilling crew (6) is when work, direction of rotation is dextrorotation, so the internal and external threads (3,4) at round tube (2) two ends is left hand thread, make screw thread rotation direction and expander (6) direction of rotation like this, prevent to add adjacent round thread linkage section (8) portion is threaded off in expansion.
Axial groove (4) processing so not only is convenient to the processing of axial groove (4) on the outer wall of round tube (2), and because of inside pipe wall is a smooth surface, is convenient to by expander (6) processing of expanding.
The completion system that utilizes insufficient balance well completion to use carries out the method embodiment 1 of completion:
Field condition: just finished under balance pressure drilling, drilling equipment, derrick, rig, preventer, not kill-job tripping assembly, expander are through being up to the standards.The employed property of drilling fluid of under balance pressure drilling is good.Carry out 149 millimeters of the uncased wellbore diameters of insufficient balance well completion construction, 180 meters of oil-gas Layer thickness, 2300 meters of the degree of depth.
See accompanying drawing 2.At first, under insufficient balance condition, utilize rig in pit shaft, to put into the expansion tube tubing string of lower end closed.The expansion tube tubing string is formed: 1 sealing tube head (9), 20 completion system and 1 extension hangers that insufficient balance well completion is used are arranged from bottom to up.The completion system that insufficient balance well completion is used adopts 20 round tubes (2) among the said apparatus embodiment, is interconnected by left hand thread by the section of being threaded (8) to form.20 round tubes (2) connect about 200 meters of back length, greater than oil-gas Layer thickness.With sending into tubing string the expansion tube tubing string is lowered to oil and gas reservoir, extension hanger hangs the expansion tube tubing string and is fixed on well inner sleeve (5) lower end.Trip out and send into tubing string.In the expansion tube tubing string is gone into the well process, whenever be lowered to 50 meters, inject a Under-balanced drilling fluid in the tubing string toward sending into, reduce expansion tube tubing string inside and outside differential pressure.Sealing tube head (9) is the blind plugging that a bottom has tapering.Can stop the downhole in reservoir fluid to enter in the expansion tube tubing string.
In the expansion tube tubing string is gone into the well process, the thrust sum that expansion tube tubing string and the deadweight of sending into tubing string are gushed out less than tubing string buoyancy and well liquid, the tubing string come-up has taken place, adopted not kill-job tripping assembly to press down by force, with the expansion tube tubing string with send into tubing string and be pressed in the pit shaft.Downforce is between the 0-10 ton.The pressure ratio of bringing into use not kill-job tripping assembly to press down by force is less, about 1 ton, progressively improves pressure to 10 ton afterwards.Finish an expansion tube tubing string and go into the well by force, arrive desired depth.
Secondly, finish the expansion tube tubing string go into the well and hang be fixed on well inner sleeve end (5) after, under insufficient balance condition, utilize rig in the expansion tube tubing string, to be lowered to expander (6).After expander (6) arrives the expansion tube tubing string, start Rotary table for drilling machine and drive expander (6) to right rotation.The rotating speed that changes with per minute 50 rotates.Utilize the downward expander (6) that advances of weight of expander (6) and top drilling tool.Propulsive force is 3 tons downwards.Expander (6) rotates in the expansion tube tubing string, descending.The completion system inwall that transfer roller on the expander (6) is used insufficient balance well completion applies expanded radially pressure.The expanded radially of expansion tube tubing string.The tube wall of the round tube after the expansion (2) is adjacent on the borehole wall (7).The axial groove (4) on completion system round tube (2) surface that the while insufficient balance well completion is used is inflated device (6) and cracks because of intensity is low, axial groove (4) is cracked the through hole (4) of diamondwise, makes round tube (2) become well screen (seeing accompanying drawing 5).Fluffy expand tube tubing string is inside and outside to connect, and promptly connects reservoir.By expander (6) rotation, and advance downwards, reach 140 millimeters after the expansion of round tube (2) external diameter expansions of exerting pressure of expansion tube tubing string tube wall.Present embodiment is not adjacent on the borehole wall of pit shaft the tubing string after the expansion.
Expander (6) goes downwards to expansion tube tubing string bottom, stops the rotation, and stops to press down.Finish expansion process.
At last, under the underbalance condition, utilize and carry expander (6) and top drilling tool thereof on the rig.The completion system that insufficient balance well completion after the expansion is used is stayed in the pit shaft.See accompanying drawing 3.Finish the overall process of insufficient balance well completion.
The method embodiment 2 of completion:
Basic identical with the method embodiment 1 of completion, difference is: after round tube (2) expanded, the completion system that insufficient balance well completion is used was adjacent on the borehole wall (7) at pit shaft.See Fig. 3.

Claims (5)

1, a kind of insufficient balance well completion method is characterized in that:
A, under insufficient balance condition, utilize rig in pit shaft, to put into the expansion tube tubing string of lower end closed, the expansion tube tubing string is formed: sealing tube head (9) is arranged from bottom to up, the completion system that insufficient balance well completion is used, extension hanger, the completion system that described insufficient balance well completion is used adopts round tube (2), the section of being threaded (8) by the pipe two ends is interconnected by left hand thread and forms, the external diameter of round tube (2) is between the 127-203 millimeter, thickness is between the 6-12 millimeter, length is between 7-13 rice, be evenly equipped with axial groove (4) around round tube (2) the central tube wall surface, the degree of depth of axial groove (4) is between the 3-11 millimeter; The external diameter of the section of being threaded at round tube (2) two ends is greater than middle part tube wall external diameter 5-40 millimeter, the expansion tube tubing string adopts and is threaded, with sending into tubing string the expansion tube tubing string is lowered to oil and gas reservoir, in the expansion tube tubing string is gone into the well process, whenever be lowered to 30-100 rice, toward sending into Under-balanced drilling fluid of perfusion in the tubing string, if the thrust sum that the deadweight that expands the pipe tubing string and send into tubing string is gushed out less than tubing string buoyancy and well liquid, when the tubing string come-up takes place, adopt not kill-job tripping assembly to press down, with the expansion tube tubing string with send into tubing string and be pressed in the pit shaft, downforce is between the 0-10 ton, extension hanger hangs the expansion tube tubing string and is fixed on well inner sleeve (5) lower end, trips out and sends into tubing string;
B, under insufficient balance condition, utilize rig in the expansion tube tubing string, to be lowered to expander (6), after expander arrives the expansion tubing string, start Rotary table for drilling machine and drive expander (6) to right rotation, direction of rotation is opposite with the expansion tube tubing string section of being threaded screw thread rotation direction, utilize the weight of expander (6) and top drilling tool to advance expander (6) downwards, propulsive force is between the 1-8 ton downwards, expander changes in expansion tubing string inward turning, under push away expansion tube tubing string tube wall exerted pressure, tubing string after make expanding is adjacent on the borehole wall of pit shaft by expander the processing of expanding of the arrival end of expansion tube tubing string, makes it form conical the inlet;
Under C, the underbalance condition, utilize rig to trip out expander (6) and top drilling tool thereof, the completion system that the insufficient balance well completion after the expansion is used is stayed in the well, finishes the overall process of insufficient balance well completion.
2, insufficient balance well completion method as claimed in claim 1 is characterized in that: the axial groove (4) on the described round tube (2) is a rectangle.
3, insufficient balance well completion method as claimed in claim 1 is characterized in that: the axial groove (4) on the described round tube (2) is circular rectangle for two ends.
4, as claim 1,2 or 3 described insufficient balance well completion methods, it is characterized in that: the uniform axial groove (4) of described round tube (2) middle part tube wall external surface peripheral, its arrangement mode is for being staggered.
5, as claim 1,2 or 3 described insufficient balance well completion methods, it is characterized in that: described axial groove (4) is positioned at the outer wall of round tube (2).
CN200510080242A 2005-07-01 2005-07-01 A kind of insufficient balance well completion method Expired - Fee Related CN100575659C (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN100575659C true CN100575659C (en) 2009-12-30

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469396B (en) * 2007-12-13 2012-01-04 Shell Internat Res Maatschhappij B V Method of expanding a tubular element in a wellbore
CN101440702B (en) * 2008-12-17 2012-07-18 中国石油天然气集团公司 Sieve tube well completion method under insufficient balance condition and temporary blocking type sieve tube
EP2789791A1 (en) * 2013-04-12 2014-10-15 Welltec A/S A downhole expandable tubular
CN104047562A (en) * 2014-06-13 2014-09-17 中国石油集团西部钻探工程有限公司 Gas underbalance casing drilling well completion expansion pipe
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

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