CN106639969B - Plugging method for perforating well section of slim hole sidetracked well - Google Patents
Plugging method for perforating well section of slim hole sidetracked well Download PDFInfo
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- CN106639969B CN106639969B CN201611075931.3A CN201611075931A CN106639969B CN 106639969 B CN106639969 B CN 106639969B CN 201611075931 A CN201611075931 A CN 201611075931A CN 106639969 B CN106639969 B CN 106639969B
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- 238000000034 method Methods 0.000 title claims abstract description 70
- 239000004568 cement Substances 0.000 claims abstract description 240
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 39
- 230000000903 blocking effect Effects 0.000 claims description 36
- 238000000465 moulding Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 230000011218 segmentation Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 7
- 230000008439 repair process Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 3
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 235000009566 rice Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a plugging method of a perforating well section of a slim hole sidetracked well, wherein the plugging method comprises the following steps of S100, opening a wellhead blowout preventer, injecting workover fluid into a sleeve and dredging a well; s200, putting an operation tubular column, and sequentially plugging each perforation well section from top to bottom until the bottommost perforation well section completes plugging operation; step S300, cleaning the sleeve to the bottom of the artificial well by the scraper bit, wherein the plugging operation is as follows: the operation pipe column is used for drilling a suspended cement plug below the perforation well section; carrying out cement squeezing and plugging operation to form a temporary cement plug above the suspended cement plug; closing the wellhead blowout preventer, and waiting for setting under pressure; and opening the wellhead blowout preventer, and sequentially drilling the temporary cement plug and the suspended cement plug by the downward-entering scraper drill bit from top to bottom to finish plugging operation. The invention also provides another plugging method for the perforating well section of the slim hole sidetracked well. The invention does not need a packer, completes plugging from top to bottom, and can be used for permanent well sealing or major repair of small well bores.
Description
Technical field
The present invention relates to the technical field of petroleum gas underground operation, in particular to a kind of Slim Hole perforated hole
The method for blocking of section.
Background technique
With the continuous increase of oilfield exploitation difficulty and the development and application of new drilling technology, Slim Hole
(internal diameter of casing is less than or equal to 86 millimeters) is more and more in the quantity of Oil Field, as these special wells are put into
Produce and use, because caused by various factors the phenomenon that its overhaul it is also more and more, such as: due to adjusting layer or other production requirements, need
Its original perforated interval is blocked.Conventional method for blocking is usually that tripping in packer carries out squeeze method closure from the bottom to top,
But the internal diameter of Slim Hole Sidetracking Technology well section is too small, is difficult to find suitable small size packer, and construction risk is larger, is easy to appear
The problem of packer plays envelope, sets unsuccessfully.
Summary of the invention
It is proposed by the present invention to solve inconvenient the technical issues of being blocked using conventional packer in Slim Hole
The method for blocking of Slim Hole perforated interval, does not need packer, completes to block according to closure principle from top to bottom.No
It is applicable only to permanently shunt in a well, applies also for the overhaul of Slim Hole.
The present invention proposes a kind of method for blocking of Slim Hole perforated interval, the Slim Hole perforated interval
Method for blocking include the following steps:
Step S100 opens Wellhead packer, workover fluid is injected into casing, using the first gauguste cutter drifting to hanger
Top, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section；
Step S200, tripping in working string successively carry out closure operation to each perforated interval from top to bottom, until leaning on
The perforated interval of the nearly artificial bottom of a well completes the closure operation；
Step S300, drag bit clears up described sleeve pipe until the artificial bottom of a well；
Wherein, the closure operation in the step S200 includes the following steps:
Step S210 plays cement cap to the perforated interval by the working string in the lower section of the perforated interval,
Time, which is coagulated to the cement cap, to be formed；
Step S220 carries out squeeze method to the perforated interval and blocks operation, and in described sleeve pipe and in the hanging water
The top of the bod forms the interim cement plug of the perforated interval；The Wellhead packer is closed, time with pressure is coagulated to the interim water
Bod molding；
Step S230, opens the Wellhead packer, tripping in drag bit, and the drag bit touches the interim water
The bod, the drag bit successively drill the interim cement plug and the cement cap from top to bottom, complete the perforated hole
The closure operation of section.
Further, in the step S210, the bottom end of the working string is made to be located at the lower section of the perforated interval；
Further include step S215 between the step S210 and the step S220, above mention the working string, makes described
The bottom end of working string is located at the top in the upper bound of the perforated interval, or the bottom end of the working string is made to be located at the perforated hole
Section lower bound lower section and in the top of the cement cap.
Further, in the step S230, after the drag bit touches the interim cement plug, and in institute
Stating before drag bit successively drills the interim cement plug and the cement cap from top to bottom further includes step S231, institute
Drag bit cleaning described sleeve pipe is stated, exposes the eyelet at the perforated interval, closes the Wellhead packer, it is described this
Perforated interval pressure testing；
If pressure testing is qualified, the Wellhead packer is opened, the drag bit in execution step S230 is from top to bottom
Successively drill the interim cement plug and the cement cap；If pressure testing is unqualified, the step S220 is executed.
Further, in the step S220, it is to squeeze superfine cement to block operation or squeeze general that the squeeze method, which blocks operation,
Logical grout off operation.
Further, in the step S215, the bottom end of the working string is located at the upper of the upper bound of the perforated interval
Just, and at a distance from the upper bound of the perforated interval it is greater than or equal to 5 meters or the bottom end of the working string is located at the perforated hole
Section lower bound lower section and in the top of the cement cap, and at a distance from the lower bound of the perforated interval be greater than or equal to 3
Rice, and it is less than or equal to 5 meters.
Further, in the step S215, the distance for above mentioning the working string is greater than or equal to 10 meters.
Further, in the step S210, the cement cap with a thickness of 10 meters.
Further, in the step S231, when pressure testing, test pressure is 25 megapascal, is kept for 30 minutes, works as pressure drop
When less than or equal to 0.5 megapascal, pressure testing is qualified；When pressure drop is greater than 0.5 megapascal, pressure testing is unqualified.
It further, further include step S400, Xiang Suoshu after the step S300 if carrying out permanent capping operation
Segmentation note integral cement plug, makes the top surface of the integral cement plug be located at the top of the hanger in casing；Then to well head
Sprue bushing protects liquid in the well section of the top surface of the integral cement plug.
Further, with pressure 48 hours a length of when waiting solidifying in the step S220.
The present invention also proposes a kind of method for blocking of Slim Hole perforated interval, the Slim Hole perforated hole
The method for blocking of section includes the following steps:
Step S10 opens Wellhead packer, workover fluid is injected into casing, using the first gauguste cutter drifting to hanger
Top, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section；
Step S20, tripping in working string, and its bottom end is made to be located at first perforation in the sidetracking well section from top to bottom
Then the first cement cap is played by the working string in the lower section of well section, time, which is coagulated to first cement cap, to be formed；
Step S30 carries out squeeze method to first perforated interval and blocks operation, and in described sleeve pipe and described
The top of first cement cap forms the first interim cement plug；Wellhead packer is closed, time with pressure is coagulated to described first temporarily
Cement plug molding；
Step S40, opens the Wellhead packer, tripping in drag bit, and the drag bit touches described first and faces
When cement plug, the drag bit successively drills the described first interim cement plug and first cement cap from top to bottom；
Step S50, the working string sequentially pass through the described first interim cement plug and described first vacantly from top to bottom
After cement plug, continue working string described in downward tripping in, and make its bottom end be located in the sidetracking well section from top to bottom second
Then the second cement cap is played by the working string in the lower section of a perforated interval；
Step S60 carries out squeeze method to second perforated interval and blocks operation, and in described sleeve pipe and described
The top of second cement cap forms the second interim cement plug；The Wellhead packer is closed, time with pressure is coagulated to described second
Interim cement plug molding；
Step S70 opens the Wellhead packer, and the drag bit cleaning described sleeve pipe is until the artificial bottom of a well.
Further, further include step S65 between the step S60 and step S70, have extremely in the sidetracking well section
Few three perforated intervals, from top to bottom successively execute the perforated interval being located at below second perforated interval
Step S40 ', step S50 ' and step S60 ' are blocked until the perforated interval close to the artificial bottom of a well completes squeeze method
Operation；
The step S40 ' is to open the Wellhead packer, and drag bit described in tripping in, the drag bit touches
Adjacent interim cement plug above the perforated interval, the drag bit successively drill adjacent above the perforated interval from top to bottom
Interim cement plug and the perforated interval above adjacent cement cap；
The step S50 ' is that the working string sequentially passes through interim water adjacent above the perforated interval from top to bottom
Above the bod and the perforated interval after adjacent cement cap, continue working string described in downward tripping in, and makes its bottom end position
In the lower section of the perforated interval, the corresponding cement cap of the perforated interval is then beaten by the working string；
The step S60 ' is, carries out squeeze method the perforated interval and blocks operation, and in described sleeve pipe and
The top of the corresponding cement cap of the perforated interval forms the corresponding interim cement plug of the perforated interval；Close the well head envelope
Well device, time with pressure coagulate interim cement plug molding corresponding to the perforated interval.
The beneficial effect of the present invention compared with the prior art is: the closure of Slim Hole perforated interval of the invention
Method does not need packer, completes to block according to closure principle from top to bottom, can be applied not only to permanently shunt in a well, may be used also
Applied to the overhaul of Slim Hole, it is made to resume production again.Matching packer is avoided, is also avoided in slim-hole side
The accident that packer construction is easy to cause is carried out in drilling well.
During carrying out closure operation to each perforated interval from top to bottom, operation is blocked in squeeze method each time
Later, to the perforated interval pressure testing, to detect closure quality, pressure testing inspection is unqualified to be continued to block operation, ensure that
Each perforated interval can be blocked completely, it is ensured that be blocked successfully.
Detailed description of the invention
Fig. 1 is structural representation of the wellbore before construction in the method for blocking of Slim Hole perforated interval of the invention
Figure；
Fig. 2 is structure of the wellbore when constructing completion in the method for blocking of Slim Hole perforated interval of the invention
Schematic diagram.
Appended drawing reference:
10- hanger；20- casing；The artificial bottom of a well 30-；
The upper bound of first perforated interval of 42-；
The lower bound of first perforated interval of 44-；
The upper bound of second perforated interval of 52-；
The lower bound of second perforated interval of 54-；
The top surface of 62- integral cement plug.
Specific embodiment
Below in conjunction with attached drawing, the technical characteristic and advantage above-mentioned to the present invention are clearly and completely described, it is clear that institute
The embodiment of description is only section Example of the invention, rather than whole embodiments.
It please refers to shown in Fig. 1 and Fig. 2, there are at least two perforated intervals in sidetracking well section, each perforated interval distinguishes position
The eyelet being connected with place stratum is respectively provided on casing 20 at the different depth of sidetracking well section, each perforated interval (in figure
It is not shown).In Fig. 1 and embodiment shown in Fig. 2, in sidetracking well section tool there are two perforated interval, first perforated interval it is upper
Be first perforated interval from top to bottom between boundary 42 and the lower bound 44 of first perforated interval, second perforated interval it is upper
It is second perforated interval from top to bottom between boundary 52 and the lower bound 54 of second perforated interval.
A kind of method for blocking of Slim Hole perforated interval of the invention includes the following steps:
Step S100 opens Wellhead packer, injects workover fluid into casing 20, using the first gauguste cutter drifting to suspension
The top of device 10, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section 30；
Step S200, tripping in working string successively carry out closure operation to each perforated interval from top to bottom, until leaning on
The perforated interval of nearly artificial bottom of a well 30 (most beneath) is completed to block operation；In the present embodiment, working string is light pipe；
Step S300, drag bit clears up casing 20 until artificial bottom of a well 30；
Wherein, the closure operation in step S200 includes the following steps:
Step S210 beats cement cap, Hou Ning to the perforated interval by working string in the lower section of the perforated interval
It is formed to cement cap；
Step S220 carries out squeeze method to the perforated interval and blocks operation, and in casing 20 and in cement cap
Top forms the interim cement plug of the perforated interval；Wellhead packer is closed, time with pressure, which is coagulated to interim cement plug, to be formed；
Step S230 opens Wellhead packer, tripping in drag bit, and drag bit touches interim cement plug, and scraper bores
Head successively drills interim cement plug and cement cap from top to bottom, completes the closure operation of the perforated interval.
In step S210, cement cap plays the role of similar packer, by cement cap by the perforated hole
Lower bound to the lower bound of well section and the perforated interval between well head to the well section between artificial bottom of a well 30 of section separates, subsequent
Step S220 in, blocking of the cement by cement cap of working string injection could pass through the eyelet of the perforated interval
Into corresponding stratum.
In step S230, when drilling interim cement plug and cement cap, the channel that can only drill out a perforation is supplied
Drag bit tripping in can also clean out interim cement plug and cement cap completely.Can according to different needs and
The drag bit of casing size selection different size in sidetracked hole.
It, will be remaining interim in each perforated interval during drag bit clears up casing 20 in step S300
Cement plug and cement cap are cleaned out.
Since in the prior art, slim-hole matching packer is more difficult, and the cement that also can be lowered into slim-hole holds stream
Device.In addition, tripping in packer is easy to by card in sidetracked hole, construction is easier that thing occurs especially in Slim Hole
Therefore.Such risk is then avoided using the method for blocking of Slim Hole perforated interval of the invention, does not need packer,
It completes to block according to closure principle from top to bottom, can be applied not only to permanently shunt in a well, apply also for Slim Hole
Overhaul, so that it is resumed production again.
If permanently shunt in a well, also need to be segmented note integral cement plug into casing 20 (below after step S300
It will be described in detail).It, can be in sidetracking well section after completing to block operation to each perforated interval if carrying out large repairs operation
The other positions of casing 20 perforation again carries out mining operations；It can also continue to dig a well downwards from artificial bottom of a well 30, deeper
Stratum in exploit.
Conventional operation mode from bottom to up, after carrying out closure operation to the perforated interval of lower section, at this time due to top
Perforated interval do not blocked, if to examine the closure quality of the perforated interval of lower section, need using packer, by lower section
Perforated interval and the perforated interval of top separate, form confined space, then can the pressure testing in this confined space.If
Not by tools such as packers, then pressure testing operation can not be carried out, the closure quality of the perforated interval of lower section cannot be examined.
The method for blocking of Slim Hole perforated interval of the invention first blocks the perforated interval of top layer, at this time most
The perforated interval on upper layer is blocked, and is not missed on the casing 20 above it, therefore, in the perforation of well head and top layer
Confined space is formed between well section, then can the pressure testing in this confined space, to examine the sealing matter of top layer's perforated interval
Amount.It gradually blocks from top to bottom, pressure testing inspection can be carried out immediately later by blocking operation every time；Pressure testing is unqualified, repeats to squeeze
Grout off operation does not need matching and tripping in packer, saves the activity duration, improve operating efficiency.
The present invention proposes top-down closure principle, to each according to the casing programme feature of Slim Hole
Cement cap is respectively adopted in perforated interval, the method with pressure for waiting the closure operation of solidifying and squeeze method is completed to the effective of perforated interval
It blocks.Blocking perforated interval is to guarantee that casing is not missed to block the preforation tunnel on casing.
Further, in step S210, the bottom end of working string is made to be located at the lower section of the perforated interval；
Further include step S215 between step S210 and step S220, above mention working string, makes the bottom end position of working string
In the top in the upper bound of the perforated interval, or make the bottom end of working string be located at the perforated interval lower bound lower section, and
The top of cement cap.Working string is above suitably mentioned, the lower end of working string can be made to depart slightly from cement cap, thus
When subsequent squeeze method being facilitated to block operation, cement is exported from working string, and then swimmingly from the eyelet of the perforated interval, from
And block the perforated interval.
Further, in step S230, after drag bit touches interim cement plug, and drag bit from up to
Under successively drill interim cement plug and cement cap before further include step S231, drag bit clears up casing 20, and exposing should
Eyelet at perforated interval closes Wellhead packer, to the perforated interval pressure testing；
If pressure testing is qualified, Wellhead packer is opened, the drag bit executed in step S230 successively drills from top to bottom
Interim cement plug and cement cap；If pressure testing is unqualified, step S220 is executed.
During carrying out closure operation to each perforated interval from top to bottom, operation is blocked in squeeze method each time
Later, to the perforated interval pressure testing, to detect closure quality, pressure testing inspection is unqualified to be continued to block operation, ensure that
Each perforated interval can be blocked completely, it is ensured that be blocked successfully.
Further, in step S220, it is to squeeze superfine cement to block operation or crowded light water mudding that squeeze method, which blocks operation,
Stifled operation.If stratum is gas-bearing formation, squeezes superfine cement and block operation with preferable plugging effect；If stratum is oil reservoir, squeeze
Superfine cement blocks operation and crowded ordinary cement blocks operation and all has preferable plugging effect.In most cases stratum is
Oil reservoir, requirement can be met by blocking operation using crowded ordinary cement.
The average grain diameter of superfine cement, hereinafter, the slurry fluidity of superfine cement is good, has stability and can fill at 5 microns
The high advantage of property.Domestic-developed go out only 7 microns of the superfine cement average grain diameter for oil well, be seven points of conventional G class g cement
One of or so, since particle is small, make sealing agent that there is good mobility and penetrability, the radius that can squeeze into processing is also relatively common
Cement is much bigger.
Further, in step S215, the bottom end of working string is located at the top in the upper bound of the perforated interval, and with this
The distance in the upper bound of perforated interval is greater than or equal to 5 meters or the bottom end of working string is located under the lower bound of the perforated interval
Just and in the top of cement cap, and at a distance from the lower bound of the perforated interval it is greater than or equal to 3 meters, and is less than or equal to 5
Rice.
Further, in step S215, the distance for above mentioning working string is greater than or equal to 10 meters.
Further, in step S210, cement cap with a thickness of 10 meters.
Further, in step S231, when pressure testing, test pressure is 25 megapascal, is kept for 30 minutes, when pressure drop is less than
Or when being equal to 0.5 megapascal, pressure testing is qualified；When pressure drop is greater than 0.5 megapascal, pressure testing is unqualified.
Further, if permanently shunt in a well, further include step S400 after step S300, be segmented into casing 20
Integral cement plug is infused, the top surface 62 of integral cement plug is made to be located at the top of hanger 10；Then to well head to integral cement plug
Sprue bushing protects liquid in the well section of top surface 62, and more preferably, the density of casing protection liquid is 1.0g/cm3~1.1g/cm3。
Further, with pressure 48 hours a length of when waiting solidifying in step S220.
The present invention also proposes a kind of method for blocking of Slim Hole perforated interval, includes the following steps:
Step S10 opens Wellhead packer, injects workover fluid into casing 20, using the first gauguste cutter drifting to suspension
The top of device 10, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section 30；
Step S20, tripping in working string, and its bottom end is made to be located at first perforated interval in sidetracking well section from top to bottom
Lower section, the first cement cap is then made a call to by working string, the first cement cap of Hou Ningzhi forms；
Step S30 carries out squeeze method to first perforated interval and blocks operation, and in casing 20 and in the first hanging water
The top of the bod forms the first interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the first interim cement plug molding；
Step S40, opens Wellhead packer, tripping in drag bit, and drag bit touches the first interim cement plug, scraper
Drill bit successively drills the first interim cement plug and the first cement cap from top to bottom；
Step S50 after working string sequentially passes through the first interim cement plug and the first cement cap from top to bottom, continues
Downward tripping in working string, and the lower section for second perforated interval for being located at its bottom end in sidetracking well section from top to bottom,
Then the second cement cap is made a call to by working string；
Step S60 carries out squeeze method to second perforated interval and blocks operation, and in casing 20 and in the second hanging water
The top of the bod forms the second interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the second interim cement plug molding；
Step S70 opens Wellhead packer, and drag bit clears up casing 20 until artificial bottom of a well 30.
In step S70, during drag bit clears up casing 20, by interim cement remaining in each perforated interval
Plug and cement cap are cleaned out.
Further include following steps after the step s 70 if necessary to permanent shut-in well: into casing 20, segmentation note is whole
Cement plug makes the top surface 62 of integral cement plug be located at the top of hanger 10；Then to well head to the top surface of integral cement plug 62
Well section in sprue bushing protect liquid.
Further, further include step S65 between step S60 and step S70, have at least three to penetrate in sidetracking well section
Hole well section, from top to bottom successively to the perforated interval being located at below second perforated interval execute step S40 ', step S50 ' and
Step S60 ', until the perforated interval close to artificial bottom of a well 30, which completes squeeze method, blocks operation；
Step S40 ' is to open Wellhead packer, tripping in drag bit, and drag bit touches phase above the perforated interval
Adjacent interim cement plug, drag bit successively drill interim cement plug and the perforation adjacent above the perforated interval from top to bottom
Adjacent cement cap above well section；
Step S50 ' is that working string sequentially passes through interim cement plug adjacent above the perforated interval from top to bottom and should
Above perforated interval after adjacent cement cap, continue downward tripping in working string, and its bottom end is made to be located at the perforated interval
Lower section, the corresponding cement cap of the perforated interval is then beaten by working string；
Step S60 ' is to carry out squeeze method the perforated interval and block operation, and in casing 20 and in the perforation
The top of the corresponding cement cap of well section forms the corresponding interim cement plug of the perforated interval；Wellhead packer is closed, it is with pressure
Time coagulates interim cement plug molding corresponding to the perforated interval.
If there are three perforated intervals for tool in sidetracking well section, a step is executed between step S60 and step S70
S40 ', step S50 ' and step S60 '；
At this point, step S40 ' is specifically, open Wellhead packer, tripping in drag bit, drag bit touches second and faces
When cement plug, drag bit successively drills the second interim cement plug and the second cement cap from top to bottom；
Step S50 ' is specifically, working string sequentially passes through the second interim cement plug and the second cement cap from top to bottom
Afterwards, continue downward tripping in working string, and be located at its bottom end under the third perforated interval in sidetracking well section from top to bottom
Then third cement cap is played by working string by side；
Step S60 ' blocks operation specifically, carrying out squeeze method to third perforated interval, and in casing 20 and the
The top of three cement caps forms the interim cement plug of third；Wellhead packer is closed, time with pressure is coagulated to the interim cement plug of third
Molding.
That is, if there are three perforated intervals, another Slim Hole of the invention to penetrate for tool in sidetracking well section
The method for blocking of hole well section, includes the following steps:
Step S10 opens Wellhead packer, injects workover fluid into casing 20, using the first gauguste cutter drifting to suspension
The top of device 10, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section 30；
Step S20, tripping in working string, and its bottom end is made to be located at first perforated interval in sidetracking well section from top to bottom
Lower section, the first cement cap is then made a call to by working string, the first cement cap of Hou Ningzhi forms；
Step S30 carries out squeeze method to first perforated interval and blocks operation, and in casing 20 and in the first hanging water
The top of the bod forms the first interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the first interim cement plug molding；
Step S40, opens Wellhead packer, tripping in drag bit, and drag bit touches the first interim cement plug, scraper
Drill bit successively drills the first interim cement plug and the first cement cap from top to bottom；
Step S50 after working string sequentially passes through the first interim cement plug and the first cement cap from top to bottom, continues
Downward tripping in working string, and the lower section for second perforated interval for being located at its bottom end in sidetracking well section from top to bottom, then
The second cement cap is played by working string；
Step S60 carries out squeeze method to second perforated interval and blocks operation, and in casing 20 and in the second hanging water
The top of the bod forms the second interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the second interim cement plug molding；
Step S40 ', opens Wellhead packer, tripping in drag bit, and drag bit touches the second interim cement plug, scrapes
Knife drill bit successively drills the second interim cement plug and the second cement cap from top to bottom；
Step S50 ', after working string sequentially passes through the second interim cement plug and the second cement cap from top to bottom, after
The lower section for the third perforated interval for continuing downward tripping in working string, and being located at its bottom end in sidetracking well section from top to bottom, so
Third cement cap is beaten by working string afterwards；
Step S60 ' carries out squeeze method to third perforated interval and blocks operation, and in casing 20 and hanging in third
The top of cement plug forms the interim cement plug of third；Wellhead packer is closed, time with pressure is coagulated to the interim cement plug molding of third；
Step S70 opens Wellhead packer, and drag bit clears up casing 20 until artificial bottom of a well 30；In step S70,
During drag bit clears up casing 20, interim cement plug remaining in each perforated interval and cement cap are cleared up dry
Only, the interim cement plug of third and third cement cap are also cleaned at this time.
Further include following steps after the step s 70 if necessary to permanent shut-in well: into casing 20, segmentation note is whole
Cement plug makes the top surface 62 of integral cement plug be located at the top of hanger 10；Then to well head to the top surface of integral cement plug 62
Well section in sprue bushing protect liquid.
In this way, the closure operation of three perforated intervals can be realized smoothly.
If there are four perforated intervals for tool in sidetracking well section, step twice is executed between step S60 and step S70
S40 ', step S50 ' and step S60 ', in this not go into detail.
By taking Fig. 1 and embodiment shown in Fig. 2 as an example, there are two perforated interval, first perforated intervals for tool in sidetracking well section
The upper bound 42 and first perforated interval lower bound 44 between for first perforated interval from top to bottom, second perforated interval
The upper bound 52 and second perforated interval lower bound 54 between for second perforated interval from top to bottom, Slim Hole is penetrated
The step of method for blocking of hole well section, enumerates as follows:
Wellhead packer is opened, workover fluid is injected into casing 20, using the first gauguste cutter drifting to the top of hanger 10
Portion, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section 30；The main borehole of straight well section has been before sidetracking
Using wedge deflection tool and grout off；
Tripping in working string, and the lower section for first perforated interval for being located at its bottom end in sidetracking well section from top to bottom,
Then the first cement cap, the molding of the first cement cap of Hou Ningzhi are made a call to by working string；
Squeeze method is carried out to first perforated interval and blocks operation, and in casing 20 and in the upper of the first cement cap
It is rectangular at the first interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the first interim cement plug molding；At this point, first faces
When cement plug can be condensed with the first cement cap it is integral；
More preferably, before blocking operation to first perforated interval squeeze method, working string is above mentioned, working string is made
Bottom end is located at the top in the upper bound 42 of first perforated interval, and is greater than or waits at a distance from the upper bound of first perforated interval 42
It is located at the lower section of the lower bound 44 of first perforated interval in the bottom end of 5 meters or working string and in the top of cement cap,
And it is greater than or equal to 3 meters at a distance from the lower bound of the first perforated interval 44, and be less than or equal to 5 meters；
Wellhead packer, tripping in drag bit are opened, drag bit touches the first interim cement plug, and drag bit is successively
Drill the first interim cement plug and the first cement cap；
More preferably, after " drag bit touches the first interim cement plug ", and " drag bit is from top to bottom successively
Drill the first interim cement plug and the first cement cap " before, drag bit clears up casing 20, and it is interim not drill first temporarily
Cement plug and the first cement cap expose the eyelet at first perforated interval, Wellhead packer are closed, to the perforation
Well section pressure testing；If pressure testing is qualified, Wellhead packer is opened, continues to execute that " drag bit successively drills first from top to bottom and faces
When cement plug and the first cement cap "；If pressure testing is unqualified, squeeze method is carried out to first perforated interval again and blocks work
Industry, until first perforated interval blocks completely；
After working string passes through the first interim cement plug and the first cement cap, continue downward tripping in, and make its bottom end
Then the second hanging cement is broken by working string in the lower section of second perforated interval in sidetracking well section from top to bottom
Plug, the molding of the second cement cap of Hou Ningzhi；
Squeeze method is carried out to second perforated interval and blocks operation, and in casing 20 and in the upper of the second cement cap
It is rectangular at the second interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the second interim cement plug molding；At this point, second faces
When cement plug can be condensed with the second cement cap it is integral；
More preferably, before blocking operation to second perforated interval squeeze method, working string is above mentioned, working string is made
Bottom end is located at the top in the upper bound 52 of second perforated interval, and is greater than or waits at a distance from the upper bound of second perforated interval 52
It is located at the lower section of the lower bound 54 of second perforated interval in the bottom end of 5 meters or working string and in the top of cement cap,
And it is greater than or equal to 3 meters at a distance from the lower bound of the second perforated interval 54, and be less than or equal to 5 meters；
Wellhead packer is opened, drag bit clears up casing 20 to artificial bottom of a well 30, and then segmentation note is whole into casing 20
Body cement plug makes the top surface 62 of integral cement plug be located at the top of hanger 10；
More preferably, tripping in drag bit, after drag bit touches the second interim cement plug, drag bit cleaning set
Pipe 20 does not drill the second interim cement plug and the second cement cap temporarily, exposes the eyelet at second perforated interval
, the Wellhead packer is closed, to second perforated interval pressure testing；If pressure testing is qualified, Wellhead packer is opened,
Drag bit continuation successively drills the second interim cement plug and the second cement cap from top to bottom, and clears up casing gradually downward
20 to artificial bottom of a well 30；If pressure testing is unqualified, squeeze method is carried out to second perforated interval again and blocks operation, until second
A perforated interval blocks completely.
It is respectively 2445.7 meters~2469.8 meters of well depth and well depth with first perforated interval and second perforated interval
2652.8 meters~2680.0 meters, for carrying out permanent capping operation, pass through following methods, it is ensured that sidetracked hole slim-hole is strong
Under the service condition that note is adopted by force, pressure alternately changes, reach effective closure in 50 years.
1, using workover fluid kill-job；Gauguste cutter (i.e. the first gauguste cutter) drifting that 118 millimeters of diameter is to the top of hanger 10
Portion (well depth × 2353.00 meter), gauguste cutter (i.e. the second gauguste cutter) drifting that 75 millimeters of diameter to artificial bottom of a well 30 (well depth ×
2766.0 rice)；
2, first 2445.7 meters~2469.8 meters of perforated interval are blocked；
(1) 60 millimeters of diameter of working string × 2485.0 meter under, play cement cap, and the cement surface of cement cap ×
2472.0 rice；
(2) after Hou Ning 24 hours, cement surface × 2472.0 meter of cement cap are visited；
(3) working string × 2435.0 meter are above mentioned, superfine cement is squeezed and blocks 2445.7 meters~2469.8 meters of perforated interval；This
In embodiment, 20 meters of working string are above mentioned；
(4) Wellhead packer is closed, after time with pressure is 48 hours solidifying, the drag bit of 75 millimeters of lower diameter visits the water in casing 20
The bod (the first interim cement plug) and drilling out are to × 2472.0 meters, pressure testing: P=25MPa, 30min, △ P≤0.5MPa are
Qualification, pressure testing is unqualified squeeze seal to block up again；
(5) after confirmation pressure testing is qualified, continue drilling out drifting to × 2766.0 meters；
3, first 2652.8 meters~2680.0 meters of perforated interval are blocked；Specific steps are similar with first perforated interval,
Details are not described herein；
4, segmentation note integral cement plug, 1500.0 meters~2766.0 meters of well section；
5, top surface × 1500.0 meter of integral cement plug to well head fills casing protection liquid, and the density of casing protection liquid is
1.0g/cm3~1.1g/cm3；
6, installing can the antitheft well head of kill-job and pressure gauge.
Particular embodiments described above has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that the above is only a specific embodiment of the present invention, the protection being not intended to limit the present invention
Range.It particularly points out, to those skilled in the art, all within the spirits and principles of the present invention, that is done any repairs
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of method for blocking of Slim Hole perforated interval, which is characterized in that the Slim Hole perforated interval
Method for blocking include the following steps:
Step S100 opens Wellhead packer, workover fluid is injected into casing, using the first gauguste cutter drifting to the top of hanger
Portion, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section；
Step S200, tripping in working string successively carry out closure operation to each perforated interval from top to bottom, until close to institute
The perforated interval for stating artificial bottom of a well completes the closure operation；
Step S300, drag bit clears up described sleeve pipe until the artificial bottom of a well；
Wherein, the closure operation in the step S200 includes the following steps:
Step S210 successively passes through the working string to the perforated hole the lower section of each perforated interval from top to bottom
Section plays cement cap, and time, which is coagulated to the cement cap, to be formed；
Step S220 successively carries out squeeze method each described perforated interval from top to bottom and blocks operation, and in described sleeve pipe
It is interior and form the interim cement plug of the perforated interval in the top of the cement cap；The Wellhead packer is closed, it is with pressure
Time, which is coagulated to the interim cement plug, to be formed；
Step S230, opens the Wellhead packer, tripping in drag bit, and the drag bit touches the interim cement
Plug, the drag bit successively drill the interim cement plug and the cement cap from top to bottom, complete the perforated interval
Closure operation.
2. the method for blocking of Slim Hole perforated interval according to claim 1, which is characterized in that in the step
In S210, the bottom end of the working string is made to be located at the lower section of the perforated interval；
Further include step S215 between the step S210 and the step S220, above mention the working string, makes the operation
The bottom end of tubing string is located at the top in the upper bound of the perforated interval, or the bottom end of the working string is made to be located at the perforated interval
The lower section of lower bound and in the top of the cement cap.
3. the method for blocking of Slim Hole perforated interval according to claim 1, which is characterized in that the step
In S230, successively bored from top to bottom after the drag bit touches the interim cement plug, and in the drag bit
Wearing the interim cement plug and the cement cap further includes before step S231, clears up the set using the drag bit
Pipe, exposes the eyelet at the perforated interval, closes the Wellhead packer, the perforated interval pressure testing；
If pressure testing is qualified, the Wellhead packer is opened, execute the drag bit in step S230 from top to bottom successively
Drill the interim cement plug and the cement cap；If pressure testing is unqualified, the step S220 is executed.
4. the method for blocking of Slim Hole perforated interval according to any one of claims 1 to 3, which is characterized in that
In the step S220, it is to squeeze superfine cement to block operation or the closure operation of crowded ordinary cement that the squeeze method, which blocks operation,.
5. the method for blocking of Slim Hole perforated interval according to claim 2, which is characterized in that the step
In S215, the bottom end of the working string is located at the top in the upper bound of the perforated interval, and with the upper bound of the perforated interval away from
Lower section from the lower bound that the bottom end for being greater than or equal to 5 meters or the working string is located at the perforated interval and it is described vacantly
The top of cement plug, and it is greater than or equal to 3 meters at a distance from the lower bound of the perforated interval, and be less than or equal to 5 meters.
6. the method for blocking of Slim Hole perforated interval according to claim 2, which is characterized in that the step
In S215, the distance for above mentioning the working string is greater than or equal to 10 meters.
7. the method for blocking of Slim Hole perforated interval according to claim 1, which is characterized in that the step
In S210, the cement cap with a thickness of 10 meters.
8. the method for blocking of Slim Hole perforated interval according to claim 3, which is characterized in that the step
In S231, when pressure testing, test pressure is 25 megapascal, is kept for 30 minutes, and when pressure drop is less than or equal to 0.5 megapascal, pressure testing is closed
Lattice；When pressure drop is greater than 0.5 megapascal, pressure testing is unqualified.
9. the method for blocking of Slim Hole perforated interval according to claim 1, which is characterized in that if carried out forever
Long property capping operation, the step S300 further include later step S400, and into described sleeve pipe, segmentation note integral cement plug, makes institute
The top surface for stating integral cement plug is located at the top of the hanger；Then to well head to the well section of the top surface of the integral cement plug
Interior sprue bushing protects liquid.
10. the method for blocking of Slim Hole perforated interval according to claim 1, which is characterized in that the step
It is with pressure 48 hours a length of when waiting solidifying in S220.
11. a kind of method for blocking of Slim Hole perforated interval, which is characterized in that the Slim Hole perforated interval
Method for blocking include the following steps:
Step S10 opens Wellhead packer, workover fluid is injected into casing, using the first gauguste cutter drifting to the top of hanger
Portion, then using the second gauguste cutter drifting to the artificial bottom of a well of sidetracking well section；
Step S20, tripping in working string, and its bottom end is made to be located at first perforated interval in the sidetracking well section from top to bottom
Lower section, the first cement cap is then made a call to by the working string, time is coagulated to first cement cap molding；
Step S30 carries out squeeze method to first perforated interval and blocks operation, and in described sleeve pipe and described first
The top of cement cap forms the first interim cement plug；Wellhead packer is closed, time with pressure is coagulated to the described first interim cement
Plug molding；
Step S40, opens the Wellhead packer, tripping in drag bit, and the drag bit touches the described first interim water
The bod, the drag bit successively drill the described first interim cement plug and first cement cap from top to bottom；
Step S50, the working string sequentially pass through the described first interim cement plug and the first hanging cement from top to bottom
After plug, continue working string described in downward tripping in, and its bottom end is made to be located at second institute in the sidetracking well section from top to bottom
The lower section of perforated interval is stated, the second cement cap is then made a call to by the working string；
Step S60 carries out squeeze method to second perforated interval and blocks operation, and in described sleeve pipe and described second
The top of cement cap forms the second interim cement plug；The Wellhead packer is closed, time with pressure is coagulated to described second temporarily
Cement plug molding；
Step S70 opens the Wellhead packer, and the drag bit cleaning described sleeve pipe is until the artificial bottom of a well.
12. the method for blocking of Slim Hole perforated interval according to claim 11, which is characterized in that in the step
Further include step S65 between rapid S60 and step S70, there are at least three perforated intervals in the sidetracking well section, from up to
Under step S40 ', step S50 ' and step successively are executed to the perforated interval being located at below second perforated interval
S60 ', until the perforated interval close to the artificial bottom of a well, which completes squeeze method, blocks operation；
The step S40 ' is to open the Wellhead packer, and drag bit described in tripping in, the drag bit touches this and penetrates
Adjacent interim cement plug above the well section of hole, the drag bit successively drill adjacent above the perforated interval face from top to bottom
When cement plug and the perforated interval above adjacent cement cap；
The step S50 ' is that the working string sequentially passes through interim cement plug adjacent above the perforated interval from top to bottom
With above the perforated interval after adjacent cement cap, continue working string described in downward tripping in, and being located at its bottom end should
Then the corresponding cement cap of the perforated interval is played by the working string in the lower section of perforated interval；
The step S60 ' is, carries out squeeze method the perforated interval and blocks operation, and penetrates in described sleeve pipe and at this
The top of the corresponding cement cap of hole well section forms the corresponding interim cement plug of the perforated interval；Close the well head shut-in well
Device, time with pressure coagulate interim cement plug molding corresponding to the perforated interval.
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| CN201611075931.3A CN106639969B (en) | 2016-11-29 | 2016-11-29 | Plugging method for perforating well section of slim hole sidetracked well |
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| CN109403912B (en) * | 2018-02-27 | 2020-10-27 | 中石化石油工程技术服务有限公司 | Method for horizontal well cementing plug and construction method |
| CN108547590B (en) * | 2018-03-30 | 2020-07-31 | 重庆大学 | Method for carrying out long-term well sealing on salt cavern storage by utilizing self-healing characteristic of salt rock damage |
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| AU2003273309A1 (en) * | 2002-09-09 | 2004-03-29 | Tomahawk Wellhead And Services, Inc. | Top drive swivel apparatus and method |
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