CN106639969A - Blocking method for perforation well sections of slim hole sidetracking well - Google Patents

Blocking method for perforation well sections of slim hole sidetracking well Download PDF

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Publication number
CN106639969A
CN106639969A CN201611075931.3A CN201611075931A CN106639969A CN 106639969 A CN106639969 A CN 106639969A CN 201611075931 A CN201611075931 A CN 201611075931A CN 106639969 A CN106639969 A CN 106639969A
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China
Prior art keywords
perforated interval
cement
well
interim
blocking
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CN201611075931.3A
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CN106639969B (en
Inventor
付玉红
杨平阁
肖素梅
林丽娜
何定海
谢昕
杨凯
邢璐薪
张春堂
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Priority to CN201611075931.3A priority Critical patent/CN106639969B/en
Publication of CN106639969A publication Critical patent/CN106639969A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00Methods or apparatus for cleaning boreholes or wells
    • E21B37/02Scrapers specially adapted therefor

Abstract

The invention provides a blocking method for perforation well sections of a slim hole sidetracking well. One of the blocking method comprises the step that S100, a wellhead well plugging device is opened, a workover fluid is filled in sleeves, and drafting process is conducted; S200, operation pipe columns are put in the well, blocking operation is successively conducted on each perforation well section from top to bottom, and the blocking operation is completed when the blocking operation is conducted on the lowermost perforation well section; and S300, the sleeves are cleaned through a drag bit to the position of an artificial well bottom, wherein the blocking operation comprises the steps that an impending cement plug is set in the position, below the corresponding perforation well section, of each operation pipe column; cement squeezing blocking operation is conducted; temporary cement plugs are formed above the impending cement plugs; the wellhead well plugging device is closed, and waiting on cement setting is conducted under pressure; and the wellhead well plugging device is opened, the downward-put drag bit successively drills through the temporary cement plugs and the impending cement plugs from top to bottom, and blocking operation is completed. The invention further provides the other blocking method for the perforation well sections of the slim hole sidetracking well. A packer is not needed, blocking is completed from top to bottom, the blocking method can be used for permanent well plugging or slim hole major repairing.

Description

The method for blocking of Slim Hole perforated interval
Technical field
The present invention relates to the technical field of petroleum gas down-hole operation, more particularly to a kind of Slim Hole perforated hole The method for blocking of section.
Background technology
With the continuous increase of oilfield exploitation difficulty, and the development and application of new drilling technology, Slim Hole (internal diameter of sleeve pipe is less than or equal to 86 millimeters) is more and more in the quantity of Oil Field, with these special wells inputs Production and application, because various factors causes the phenomenon of its overhaul also more and more, such as:Due to adjusting layer or other production requirements, need Its former perforated interval is blocked.Conventional method for blocking enters packer under being usually carries out from the bottom to top squeeze method closure, But the internal diameter of Slim Hole Sidetracking Technology well section is too little, it is difficult to suitable small size packer is found, and construction risk is larger, easily occurs Packer plays envelope, sets the problem of failure.
The content of the invention
The technical problem that inconvenience is blocked using conventional packer in solve Slim Hole, it is proposed by the present invention The method for blocking of Slim Hole perforated interval, it is not necessary to packer, according to closure principle from top to bottom closure is completed.No Permanent shut-in well is applicable only to, the overhaul of Slim Hole is applied also for.
The present invention proposes a kind of method for blocking of Slim Hole perforated interval, the Slim Hole perforated interval Method for blocking comprise the steps:
Step S100, opens Wellhead packer, workover fluid is injected into sleeve pipe, using the first drift size gauge tool drifting to hanger Top, then using the artificial bottom of a well of the second drift size gauge tool drifting to sidetracking well section;
Step S200, under enter working string, successively closure operation is carried out 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 cleaning described sleeve pipe is until the artificial bottom of a well;
Wherein, the closure operation in step S200 comprises the steps:
Step S210, cement cap is played in the lower section of the perforated interval by the working string to the perforated interval, Time is coagulated to cement cap shaping;
Step S220, squeeze method closure operation is carried out to the perforated interval, 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 The bod is molded;
Step S230, opens the Wellhead packer, under enter drag bit, the drag bit touches the interim water The bod, the drag bit drills successively from top to bottom the interim cement plug and the cement cap, completes the perforated hole The closure operation of section.
Further, in step S210, the bottom of the working string is made positioned at the lower section of the perforated interval;
Also include step S215 between step S210 and step S220, above carry the working string, make described The bottom of working string is located at the top in the upper bound of the perforated interval, or makes the bottom of the working string be located at the perforated hole Section lower bound lower section and in the top of the cement cap.
Further, in step S230, after the drag bit touches the interim cement plug, and in institute State drag bit to drill successively from top to bottom before the interim cement plug and the cement cap also including step S231, institute Drag bit cleaning described sleeve pipe is stated, exposes the eyelet at the perforated interval, the Wellhead packer is closed, to this described 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 The interim cement plug and the cement cap are drilled successively;If pressure testing is unqualified, step S220 is performed.
Further, in step S220, the squeeze method closure operation blocks operation or crowded general to squeeze superfine cement Logical grout off operation.
Further, in step S215, the bottom of the working string is located at the upper of the upper bound of the perforated interval Side, and it is more than or equal to 5 meters with the distance in the upper bound of the perforated interval, or the bottom of the working string is located at the perforated hole The lower section of the lower bound of section and in the top of the cement cap, and it is more than or equal to 3 with the distance of the lower bound of the perforated interval Rice, and less than or equal to 5 meters.
Further, in step S215, the distance for above carrying the working string is more than or equal to 10 meters.
Further, in step S210, the thickness of the cement cap is 10 meters.
Further, in step S231, during pressure testing, test pressure is 25 MPas, is kept for 30 minutes, works as pressure drop During less than or equal to 0.5 MPa, pressure testing is qualified;When pressure drop is more than 0.5 MPa, pressure testing is unqualified.
Further, if carrying out permanent capping operation, step S400 is also included after step S300, to described Segmentation note integral cement plug in sleeve pipe, makes the top surface of the integral cement plug positioned at the top of the hanger;Then to well head The sprue bushing protection liquid to the well section of the top surface of the integral cement plug.
Further, it is with pressure a length of 48 hours when waiting solidifying in 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 comprises the steps:
Step S10, opens Wellhead packer, workover fluid is injected into sleeve pipe, using the first drift size gauge tool drifting to hanger Top, then using the artificial bottom of a well of the second drift size gauge tool drifting to sidetracking well section;
Step S20, under enter working string, and make its bottom be located at first perforation in the sidetracking well section from top to bottom The lower section of well section, then plays the first cement cap by the working string, and time is coagulated to first cement cap shaping;
Step S30, squeeze method closure operation is carried out to first perforated interval, and in described sleeve pipe and described The top of the first cement cap forms the first interim cement plug;Close Wellhead packer, time with pressure is coagulated to described first interim Cement plug is molded;
Step S40, opens the Wellhead packer, under enter drag bit, the drag bit touches described first and faces When cement plug, the drag bit drills successively from top to bottom the described first interim cement plug and first cement cap;
Step S50, the working string sequentially passes through from top to bottom the described first interim cement plug and described first hanging After cement plug, the working string is entered under continuing downwards, and make second in the sidetracking well section from top to bottom of its bottom The lower section of the individual perforated interval, then plays the second cement cap by the working string;
Step S60, squeeze method closure operation is carried out to second perforated interval, and in described sleeve pipe and described The top of the 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 shaping;
Step S70, opens the Wellhead packer, and the drag bit cleaning described sleeve pipe is until the artificial bottom of a well.
Further, also include having extremely in step S65, the sidetracking well section between step S60 and step S70 Few three perforated intervals, are pointed to successively from top to bottom the perforated interval below second perforated interval and perform Step S40 ', step S50 ' and step S60 ', until the perforated interval near the artificial bottom of a well completes squeeze method closure Operation;
Step S40 ' be to open the Wellhead packer, under enter the drag bit, the drag bit is touched The adjacent interim cement plug in the perforated interval top, it is adjacent that the drag bit drills successively from top to bottom the perforated interval top The adjacent cement cap of interim cement plug and perforated interval top;
Step S50 ' it is that the working string sequentially passes through from top to bottom the adjacent interim water in the perforated interval top After the adjacent cement cap in the bod and the perforated interval top, under continuing downwards the working string is entered, and make its bottom position In the lower section of the perforated interval, then the corresponding cement cap of the perforated interval is beaten by the working string;
Step S60 ' be perforated interval this described is carried out squeeze method closure 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 coagulates interim cement plug shaping corresponding to the perforated interval.
The present invention is compared to the beneficial effect of prior art:The closure of the Slim Hole perforated interval of the present invention Method, it is not necessary to packer, according to closure principle from top to bottom closure is completed, and can be applied not only to permanent shut-in well, may be used also It is applied to the overhaul of Slim Hole so as to resume production again.Matching packer is avoided, be it also avoid in slim-hole side The accident that packer construction is easily caused is carried out in drilling well.
During closure operation is carried out to each perforated interval from top to bottom, in squeeze method each time operation is blocked Afterwards, to the perforated interval pressure testing, to detect closure quality, pressure testing inspection is unqualified to be proceeded to block operation, it is ensured that Each perforated interval can be blocked completely, it is ensured that be blocked successfully.
Description of the drawings
Fig. 1 is structural representation of the well before construction in the method for blocking of the Slim Hole perforated interval of the present invention Figure;
Fig. 2 be the present invention Slim Hole perforated interval method for blocking in well construction complete when structure Schematic diagram.
Reference:
10- hangers;20- sleeve pipes;30- artificials bottom of a well;
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 plugs.
Specific embodiment
Below in conjunction with accompanying drawing, the technical characteristic and advantage above-mentioned to the present invention is clearly and completely described, it is clear that institute The embodiment of description section Example only of the invention, rather than whole embodiments.
Refer 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 with sleeve pipe 20 at the different depth of sidetracking well section, each perforated interval (in figure It is not shown).In embodiment shown in Fig. 1 and Fig. 2, there are two perforated intervals in sidetracking well section, first perforated interval it is upper Be first perforated interval from top to bottom between the lower bound 44 of boundary 42 and first perforated interval, second perforated interval it is upper It is second perforated interval from top to bottom between the lower bound 54 of boundary 52 and second perforated interval.
A kind of method for blocking of Slim Hole perforated interval of the present invention comprises the steps:
Step S100, opens Wellhead packer, and into sleeve pipe 20 workover fluid is injected, using the first drift size gauge tool drifting to suspension The top of device 10, then using the artificial bottom of a well 30 of the second drift size gauge tool drifting to sidetracking well section;
Step S200, under enter working string, successively closure operation is carried out to each perforated interval from top to bottom, until leaning on The perforated interval of nearly artificial bottom of a well 30 (most beneath) completes to block operation;In the present embodiment, working string is light pipe;
Step S300, drag bit cleaning sleeve pipe 20 is until artificial bottom of a well 30;
Wherein, the closure operation in step S200 comprises the steps:
Step S210, cement cap, Hou Ning are beaten in the lower section of the perforated interval by working string to the perforated interval To cement cap shaping;
Step S220, squeeze method closure operation is carried out to the perforated interval, and in sleeve pipe 20 and in cement cap Top forms the interim cement plug of the perforated interval;Wellhead packer is closed, time with pressure is coagulated to the shaping of interim cement plug;
Step S230, opens Wellhead packer, under enter drag bit, drag bit touches interim cement plug, and scraper is bored Head drills successively from top to bottom interim cement plug and cement cap, completes the closure operation of the perforated interval.
In step S210, cement cap plays a part of similar packer, by cement cap by the perforated hole The lower bound of the lower bound to the well section between well head and the perforated interval of section is separated to the well section between artificial bottom of a well 30, follow-up The step of S220 in, working string injection cement stopped by cement cap, the eyelet of the perforated interval could be passed through Into corresponding stratum.
In step S230, when drilling interim cement plug and cement cap, the passage that can only get out an insertion is supplied Enter under drag bit, it is also possible to completely clean out interim cement plug and cement cap.Can according to different demands and Casing size in sidetracked hole selects the drag bit of different size.
It is interim by what is remained in each perforated interval during drag bit cleaning sleeve pipe 20 in step S300 Cement plug and cement cap are cleaned out.
Because in prior art, slim-hole matching packer is more difficult, also holds stream without the cement that can be lowered into The Small Well intraocular Device.In addition, enter packer under in sidetracked hole being easy to by card, easily there is thing in the construction particularly in Slim Hole Therefore.Such risk is then avoided using the method for blocking of the Slim Hole perforated interval of the present invention, it is not necessary to packer, Closure is completed according to closure principle from top to bottom, permanent shut-in well is can be applied not only to, Slim Hole is applied also for Overhaul so as to resume production again.
If permanently shunt in a well, the segmentation into sleeve pipe 20 is also needed to after step S300 and notes integral cement plug (below Will be described in detail).If carrying out large repairs operation, after closure operation is completed to each perforated interval, can be in sidetracking well section The other positions of sleeve pipe 20 perforation again, carries out mining operations;Can be to continue well-digging downwards from artificial bottom of a well 30, deeper Stratum in exploit.
Conventional operating type from bottom to up, is carried out after closure operation, now due to top to the perforated interval of lower section Perforated interval do not blocked, if to check lower section perforated interval closure quality, need to adopt packer, by lower section Perforated interval separate with the perforated interval of top, formed confined space, then can be with pressure testing in here confined space.If Not by instruments such as packers, then pressure testing operation cannot be carried out, it is impossible to the closure quality of the perforated interval below inspection.
The method for blocking of the Slim Hole perforated interval of the present invention, first blocks the perforated interval of the superiors, now most The perforated interval on upper strata is blocked, and without leakage on the sleeve pipe 20 above it, therefore, in well head and the perforation of the superiors Confined space is formed between well section, then can be with pressure testing in here confined space, to check the closure matter of the superiors' perforated interval Amount.Gradually block from top to bottom, can immediately carry out pressure testing inspection after closure operation every time;Pressure testing is unqualified, repeats to squeeze Grout off operation, it is not necessary to matching and under enter packer, save 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 Perforated interval is respectively adopted solidifying and squeeze method closure operation the method for cement cap, time with pressure and completes to the effective of perforated interval Closure.Blocking perforated interval is to block the preforation tunnel on sleeve pipe, it is ensured that sleeve pipe is not missed.
Further, in step S210, the bottom of working string is made positioned at the lower section of the perforated interval;
Also include step S215 between step S210 and step S220, above carry working string, make the bottom position of working string In the top in the upper bound of the perforated interval, or the bottom of working string is made positioned at the lower section of the lower bound of the perforated interval, and The top of cement cap.Suitably working string is above carried, the lower end that can make working string departs slightly from cement cap, so as to When facilitating the closure operation of follow-up squeeze method, 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 in drag bit from up to Under to drill successively before interim cement plug and cement cap and also include step S231, drag bit cleaning sleeve pipe 20 exposes this 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 in execution step S230 is drilled successively from top to bottom Interim cement plug and cement cap;If pressure testing is unqualified, execution step S220.
During closure operation is carried out to each perforated interval from top to bottom, in squeeze method each time operation is blocked Afterwards, to the perforated interval pressure testing, to detect closure quality, pressure testing inspection is unqualified to be proceeded to block operation, it is ensured that Each perforated interval can be blocked completely, it is ensured that be blocked successfully.
Further, in step S220, squeeze method closure operation blocks operation or crowded light water mudding to squeeze superfine cement Stifled operation.If stratum is gas-bearing formation, squeezes superfine cement closure operation and there is preferable plugging effect;If stratum is oil reservoir, squeeze Superfine cement blocks operation and the closure operation of crowded ordinary cement is respectively provided with preferable plugging effect.In most cases stratum is Oil reservoir, use requirement can be met using the closure operation of crowded ordinary cement.
The average grain diameter of superfine cement is below 5 microns, and the slurry fluidity of superfine cement is good, with stability and can filling The high advantage of property.Only 7 microns of the superfine cement average grain diameter for oil well that domestic-developed goes out, is seven points of conventional G class g cements One of left and right, because particle is little, make sealing agent that there is good mobility and penetrability, the radius that can clamp-on process is also more common Cement is much bigger.
Further, in step S215, the bottom 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 more than or equal to 5 meters, or the bottom of working string is located under the lower bound of the perforated interval Just and in the top of cement cap, and with the distance of the lower bound of the perforated interval it is more than or equal to 3 meters, and less than or equal to 5 Rice.
Further, in step S215, the distance for above carrying working string is more than or equal to 10 meters.
Further, in step S210, the thickness of cement cap is 10 meters.
Further, in step S231, during pressure testing, test pressure is 25 MPas, is kept for 30 minutes, when pressure drop is less than Or during equal to 0.5 MPa, pressure testing is qualified;When pressure drop is more than 0.5 MPa, pressure testing is unqualified.
Further, if permanently shunt in a well, step S400 is also included after step S300, is segmented into sleeve pipe 20 Note integral cement plug, makes the top surface 62 of integral cement plug positioned at the top of hanger 10;Then to well head to integral cement plug Sprue bushing protection liquid in the well section of top surface 62, more preferably, the density of casing protection liquid is 1.0g/cm3~1.1g/cm3
Further, it is with pressure a length of 48 hours when waiting solidifying in step S220.
The present invention also proposes a kind of method for blocking of Slim Hole perforated interval, comprises the steps:
Step S10, opens Wellhead packer, and into sleeve pipe 20 workover fluid is injected, using the first drift size gauge tool drifting to suspension The top of device 10, then using the artificial bottom of a well 30 of the second drift size gauge tool drifting to sidetracking well section;
Step S20, under enter working string, and make its bottom be located at first perforated interval in sidetracking well section from top to bottom Lower section, then the first cement cap is made a call to by working string, time is coagulated to the shaping of the first cement cap;
Step S30, squeeze method closure operation is carried out to first perforated interval, and in sleeve pipe 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 shaping;
Step S40, open Wellhead packer, under enter drag bit, drag bit touches the first interim cement plug, scraper Drill bit drills successively from top to bottom the first interim cement plug and the first cement cap;
Step S50, working string is sequentially passed through from top to bottom after the first interim cement plug and the first cement cap, is continued Enter working string under downwards, and make its bottom be located at the lower section of second perforated interval in sidetracking well section from top to bottom, Then the second cement cap is made a call to by working string;
Step S60, squeeze method closure operation is carried out to second perforated interval, and in sleeve pipe 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 shaping;
Step S70, opens Wellhead packer, and drag bit cleaning sleeve pipe 20 is until artificial bottom of a well 30.
In step S70, during drag bit cleaning sleeve pipe 20, the interim cement that will be remained in each perforated interval Plug and cement cap are cleaned out.
If necessary to permanent shut-in well, after the step s 70, also comprise the steps:Segmentation note is overall into sleeve pipe 20 Cement plug, makes the top surface 62 of integral cement plug positioned at the top of hanger 10;Then to the top surface 62 of well head to integral cement plug Well section in sprue bushing protection liquid.
Further, also include having at least three to penetrate in step S65, sidetracking well section between step S60 and step S70 Hole well section, perforated interval execution step S40 being pointed to successively from top to bottom below second perforated interval ', step S50 ' and Step S60 ', until the perforated interval near artificial bottom of a well 30 completes squeeze method closure operation;
Step S40 ' be to open Wellhead packer, under enter drag bit, drag bit touches perforated interval top phase Adjacent interim cement plug, drag bit drills successively from top to bottom the adjacent interim cement plug in the perforated interval top and the perforation The adjacent cement cap in well section top;
Step S50 ' it is that working string sequentially passes through from top to bottom the adjacent interim cement plug in the perforated interval top and is somebody's turn to do After the adjacent cement cap in perforated interval top, working string is entered under continuing downwards, and make its bottom be located at the perforated interval Lower section, then the corresponding cement cap of the perforated interval is beaten by working string;
Step S60 ' it is that squeeze method closure operation is carried out to perforated interval this described, and in sleeve pipe 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 shaping corresponding to the perforated interval.
If having three perforated intervals in sidetracking well section, a step is performed between step S60 and step S70 S40 ', step S50 ' and step S60 ';
Now, step S40 ' specifically, open Wellhead packer, under enter drag bit, drag bit touches second and faces When cement plug, drag bit drills successively from top to bottom the second interim cement plug and the second cement cap;
Step S50 ' specifically, working string sequentially passes through from top to bottom the second interim cement plug and the second cement cap Afterwards, working string is entered under continuing downwards, and its bottom is located under the 3rd perforated interval in sidetracking well section from top to bottom Side, then plays the 3rd cement cap by working string;
Step S60 ' specifically, carry out squeeze method closure operation to the 3rd perforated interval, and in the sleeve pipe 20 and the The top of three cement caps forms the 3rd interim cement plug;Wellhead packer is closed, time with pressure is coagulated to the 3rd interim cement plug Shaping.
If that is, another kind of Slim Hole for having three perforated intervals, the present invention in sidetracking well section is penetrated The method for blocking of hole well section, comprises the steps:
Step S10, opens Wellhead packer, and into sleeve pipe 20 workover fluid is injected, using the first drift size gauge tool drifting to suspension The top of device 10, then using the artificial bottom of a well 30 of the second drift size gauge tool drifting to sidetracking well section;
Step S20, under enter working string, and make its bottom be located at first perforated interval in sidetracking well section from top to bottom Lower section, then the first cement cap is made a call to by working string, time is coagulated to the shaping of the first cement cap;
Step S30, squeeze method closure operation is carried out to first perforated interval, and in sleeve pipe 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 shaping;
Step S40, open Wellhead packer, under enter drag bit, drag bit touches the first interim cement plug, scraper Drill bit drills successively from top to bottom the first interim cement plug and the first cement cap;
Step S50, working string is sequentially passed through from top to bottom after the first interim cement plug and the first cement cap, is continued Enter working string under downwards, and make its bottom be located at the lower section of second perforated interval in sidetracking well section from top to bottom, then Second cement cap is made a call to by working string;
Step S60, squeeze method closure operation is carried out to second perforated interval, and in sleeve pipe 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 shaping;
Step S40 ', open Wellhead packer, under enter drag bit, drag bit touches the second interim cement plug, scrapes Knife drill bit drills successively from top to bottom the second interim cement plug and the second cement cap;
Step S50 ', working string is sequentially passed through from top to bottom after the second interim cement plug and the second cement cap, after Enter working string under continuing downwards, and make its bottom be located at the lower section of the 3rd perforated interval in sidetracking well section from top to bottom, so Afterwards the 3rd cement cap is made a call to by working string;
Step S60 ', squeeze method closure operation is carried out to the 3rd perforated interval, and it is in sleeve pipe 20 and hanging the 3rd The top of cement plug forms the 3rd interim cement plug;Wellhead packer is closed, time with pressure is coagulated to the 3rd interim cement plug shaping;
Step S70, opens Wellhead packer, and drag bit cleaning sleeve pipe 20 is until artificial bottom of a well 30;In step S70, It is during drag bit cleaning sleeve pipe 20, the interim cement plug remained in each perforated interval and cement cap cleaning is dry Only, now the 3rd interim cement plug and the 3rd cement cap are also cleaned.
If necessary to permanent shut-in well, after the step s 70, also comprise the steps:Segmentation note is overall into sleeve pipe 20 Cement plug, makes the top surface 62 of integral cement plug positioned at the top of hanger 10;Then to the top surface 62 of well head to integral cement plug Well section in sprue bushing protection liquid.
As such, it is possible to smoothly realize the closure operation of three perforated intervals.
If having four perforated intervals in sidetracking well section, step twice is performed between step S60 and step S70 S40 ', step S50 ' and step S60 ', in this not go into detail.
By taking the embodiment shown in Fig. 1 and Fig. 2 as an example, there is two perforated intervals, first perforated interval in sidetracking well section The upper bound 42 and the lower bound 44 of first perforated interval between for first perforated interval from top to bottom, second perforated interval The upper bound 52 and the lower bound 54 of second perforated interval between penetrate for second perforated interval from top to bottom, Slim Hole The step of method for blocking of hole well section, enumerates as follows:
Wellhead packer is opened, workover fluid is injected into sleeve pipe 20, using the top of the first drift size gauge tool drifting to hanger 10 Portion, then using the artificial bottom of a well 30 of the second drift size gauge tool drifting to sidetracking well section;The main borehole of straight well section has been before sidetracking Using wedge deflection tool and grout off;
Under enter working string, and make its bottom be located at the lower section of first perforated interval in sidetracking well section from top to bottom, Then the first cement cap is made a call to by working string, time is coagulated to the shaping of the first cement cap;
Squeeze method closure operation is carried out to first perforated interval, and in sleeve pipe 20 and in the upper of the first cement cap It is square into the first interim cement plug;Wellhead packer is closed, time with pressure is coagulated to the first interim cement plug shaping;Now, first faces When cement plug can with the first cement cap condense it is integral;
More preferably, before to first perforated interval squeeze method closure operation, working string is above carried, makes working string Bottom is located at the top in the upper bound 42 of first perforated interval, and is more than or waits with the distance in the upper bound 42 of first perforated interval In 5 meters, or the bottom of working string is located at the lower section of the lower bound 44 of first perforated interval and in the top of cement cap, And it is more than or equal to 3 meters with the distance of the lower bound 44 of the first perforated interval, and less than or equal to 5 meters;
Open Wellhead packer, under enter drag bit, 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 cleaning sleeve pipe 20 does not temporarily drill first interim 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, continue executing with that " drag bit drills successively from top to bottom first and faces When cement plug and the first cement cap ";If pressure testing is unqualified, carries out squeeze method closure to first perforated interval again and make Industry, until first perforated interval is blocked completely;
Working string enters through after the first interim cement plug and the first cement cap under continuing downwards, and makes its bottom The lower section of second perforated interval in sidetracking well section from top to bottom, then breaks the second hanging cement by working string Plug, time is coagulated to the shaping of the second cement cap;
Squeeze method closure operation is carried out to second perforated interval, and in sleeve pipe 20 and in the upper of the second cement cap It is square into the second interim cement plug;Wellhead packer is closed, time with pressure is coagulated to the second interim cement plug shaping;Now, second faces When cement plug can with the second cement cap condense it is integral;
More preferably, before to second perforated interval squeeze method closure operation, working string is above carried, makes working string Bottom is located at the top in the upper bound 52 of second perforated interval, and is more than or waits with the distance in the upper bound 52 of second perforated interval In 5 meters, or the bottom of working string is located at the lower section of the lower bound 54 of second perforated interval and in the top of cement cap, And it is more than or equal to 3 meters with the distance of the lower bound 54 of the second perforated interval, and less than or equal to 5 meters;
Wellhead packer is opened, drag bit clears up sleeve pipe 20 to artificial bottom of a well 30, and then segmentation note is whole into sleeve pipe 20 Body cement plug, makes the top surface 62 of integral cement plug positioned at the top of hanger 10;
More preferably, drag bit is entered under, after drag bit touches the second interim cement plug, drag bit cleaning set Pipe 20, does not temporarily drill the second interim cement plug and the second cement cap, 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 continues to drill the second interim cement plug and the second cement cap successively from top to bottom, and clears up sleeve pipe gradually downward 20 to artificial bottom of a well 30;If pressure testing is unqualified, squeeze method closure operation is carried out to second perforated interval again, until second Individual perforated interval is blocked completely.
2445.7 meters~2469.8 meters of well depth and well depth are respectively with first perforated interval and second perforated interval 2652.8 meters~2680.0 meters, as a example by carrying out permanent capping operation, by following methods, it is ensured that sidetracked hole slim-hole is strong Note is adopted by force, pressure replaces under the service condition of change, reaches effective closure of 50 years.
1st, using workover fluid kill-job;The top of drift size gauge tool (i.e. the first drift size gauge tool) drifting to hanger 10 that 118 millimeters of diameter Portion (well depth × 2353.00 meter), drift size gauge tool (i.e. the second drift size gauge tool) drifting that 75 millimeters of diameter to artificial bottom of a well 30 (well depth × 2766.0 rice);
2nd, first 2445.7 meters~2469.8 meters of perforated interval is blocked;
(1) working string × 2485.0 meter of 60 millimeters of diameter under, play cement cap, and the cement surface of cement cap × 2472.0 rice;
(2) Hou Ning visits cement surface × 2472.0 meter of cement cap after 24 hours;
(3) working string × 2435.0 meter are above carried, squeezes superfine cement 2445.7 meters~2469.8 meters of perforated interval of closure;This In embodiment, 20 meters of working string is above carried;
(4) Wellhead packer is closed, after time with pressure is solidifying 48 hours, the drag bit of 75 millimeters of lower diameter visits the water in sleeve pipe 20 Extremely × 2472.0 meters of the bod (the first interim cement plug) and drilling out, pressure testing:P=25MPa, 30min, △ P≤0.5MPa is Qualified, pressure testing is unqualified squeeze seal must to block up again;
(5) after confirming that pressure testing is qualified, drilling out drifting is continued to × 2766.0 meters;
3rd, first 2652.8 meters~2680.0 meters of perforated interval is blocked;Concrete steps are similar with first perforated interval, Will not be described here;
4th, segmentation note integral cement plug, 1500.0 meters~2766.0 meters of well section;
5th, 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
6th, installing can the antitheft well head of kill-job and pressure gauge.
Particular embodiments described above, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect Describe in detail, it will be appreciated that the foregoing is only the specific embodiment of the present invention, the protection being not intended to limit the present invention Scope.Particularly point out, to those skilled in the art, it is all within the spirit and principles in the present invention, done any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (12)

1. a kind of method for blocking of Slim Hole perforated interval, it is characterised in that the Slim Hole perforated interval Method for blocking comprise the steps:
Step S100, opens Wellhead packer, workover fluid is injected into sleeve pipe, using the top of the first drift size gauge tool drifting to hanger Portion, then using the artificial bottom of a well of the second drift size gauge tool drifting to sidetracking well section;
Step S200, under enter working string, successively closure operation is carried out to each perforated interval from top to bottom, until near institute The perforated interval for stating artificial bottom of a well completes the closure operation;
Step S300, drag bit cleaning described sleeve pipe is until the artificial bottom of a well;
Wherein, the closure operation in step S200 comprises the steps:
Step S210, cement cap, Hou Ning are beaten in the lower section of the perforated interval by the working string to the perforated interval To cement cap shaping;
Step S220, squeeze method closure operation is carried out to the perforated interval, and in described sleeve pipe and in the cement cap Top form the interim cement plug of the perforated interval;The Wellhead packer is closed, time with pressure is coagulated to the interim cement plug Shaping;
Step S230, opens the Wellhead packer, under enter drag bit, the drag bit touches the interim cement Plug, the drag bit drills successively from top to bottom the interim cement plug and the cement cap, completes the perforated interval Closure operation.
2. the method for blocking of Slim Hole perforated interval according to claim 1, it is characterised in that in the step In S210, the bottom of the working string is made positioned at the lower section of the perforated interval;
Also include step S215 between step S210 and step S220, above carry the working string, make the operation The bottom of tubing string is located at the top in the upper bound of the perforated interval, or makes the bottom of the working string 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, it is characterised in that the step In S230, after the drag bit touches the interim cement plug, and bore successively from top to bottom in the drag bit Wear and also include before the interim cement plug and the cement cap step S231, the drag bit clears up described sleeve pipe, Expose the eyelet at the perforated interval, the Wellhead packer is closed, to perforated interval pressure testing this described;
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, step S220 is performed.
4. the method for blocking of the Slim Hole perforated interval according to any one of claims 1 to 3, it is characterised in that In step S220, the squeeze method closure operation blocks operation to squeeze superfine cement closure operation or crowded ordinary cement.
5. the method for blocking of Slim Hole perforated interval according to claim 2, it is characterised in that the step In S215, the bottom 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 From more than or equal to 5 meters, or the bottom of the working string is located at the lower section of the lower bound of the perforated interval and described hanging The top of cement plug, and it is more than or equal to 3 meters with the distance of the lower bound of the perforated interval, and less than or equal to 5 meters.
6. the method for blocking of Slim Hole perforated interval according to claim 2, it is characterised in that the step In S215, the distance for above carrying the working string is more than or equal to 10 meters.
7. the method for blocking of Slim Hole perforated interval according to claim 1, it is characterised in that the step In S210, the thickness of the cement cap is 10 meters.
8. the method for blocking of Slim Hole perforated interval according to claim 3, it is characterised in that the step In S231, during pressure testing, test pressure is 25 MPas, is kept for 30 minutes, and when pressure drop is less than or equal to 0.5 MPa, pressure testing is closed Lattice;When pressure drop is more than 0.5 MPa, pressure testing is unqualified.
9. the method for blocking of Slim Hole perforated interval according to claim 1, it is characterised in that if carried out forever Long property capping operation, also includes step S400 after step S300, and segmentation note integral cement plug, makes institute into described sleeve pipe The top surface for stating integral cement plug is located at the top of the hanger;Then to the well section of well head to 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, it is characterised in that the step It is with pressure a length of 48 hours when waiting solidifying in S220.
A kind of 11. method for blocking of Slim Hole perforated interval, it is characterised in that the Slim Hole perforated interval Method for blocking comprise the steps:
Step S10, opens Wellhead packer, workover fluid is injected into sleeve pipe, using the top of the first drift size gauge tool drifting to hanger Portion, then using the artificial bottom of a well of the second drift size gauge tool drifting to sidetracking well section;
Step S20, under enter working string, and make its bottom be located at first perforated interval in the sidetracking well section from top to bottom Lower section, then the first cement cap is made a call to by the working string, time is coagulated to first cement cap shaping;
Step S30, squeeze method closure operation is carried out to first perforated interval, 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 shaping;
Step S40, opens the Wellhead packer, under enter drag bit, the drag bit touches the described first interim water The bod, the drag bit drills successively from top to bottom the described first interim cement plug and first cement cap;
Step S50, the working string sequentially passes through from top to bottom the described first interim cement plug and the first hanging cement After plug, the working string is entered under continuing downwards, and make its bottom be located at second institute in the sidetracking well section from top to bottom The lower section of perforated interval is stated, then the second cement cap is made a call to by the working string;
Step S60, squeeze method closure operation is carried out to second perforated interval, and in described sleeve pipe and described second The top of cement cap forms the second interim cement plug;Close the Wellhead packer, time with pressure is coagulated to described second interim Cement plug is molded;
Step S70, opens the Wellhead packer, and the drag bit cleaning described sleeve pipe is until the artificial bottom of a well.
The method for blocking of 12. Slim Hole perforated intervals according to claim 11, it is characterised in that in the step It is rapid also to include that there is perforated interval described at least three in step S65, the sidetracking well section between S60 and step S70, from up to Under be pointed to successively below second perforated interval perforated interval execution step S40 ', step S50 ' and step S60 ', until the perforated interval near the artificial bottom of a well completes squeeze method closure operation;
Step S40 ' be to open the Wellhead packer, under enter the drag bit, the drag bit touches this and penetrates The adjacent interim cement plug in hole well section top, the drag bit drills successively from top to bottom adjacent above the perforated interval facing When cement plug and perforated interval top adjacent cement cap;
Step S50 ' it is that the working string sequentially passes through from top to bottom the adjacent interim cement plug in the perforated interval top After the cement cap adjacent with the perforated interval top, the working string is entered under continuing downwards, and is located at its bottom to be somebody's turn to do The lower section of perforated interval, then plays the corresponding cement cap of the perforated interval by the working string;
Step S60 ' it is that squeeze method closure operation is carried out to perforated interval this described, and penetrate 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 coagulates interim cement plug shaping corresponding to the perforated interval.
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