CN103939018A - Barrier-avoiding sidetracking technology for workover rig - Google Patents
Barrier-avoiding sidetracking technology for workover rig Download PDFInfo
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- CN103939018A CN103939018A CN201410206124.5A CN201410206124A CN103939018A CN 103939018 A CN103939018 A CN 103939018A CN 201410206124 A CN201410206124 A CN 201410206124A CN 103939018 A CN103939018 A CN 103939018A
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Abstract
The invention provides a barrier-avoiding sidetracking technology for a workover rig. The technology comprises the first step that a windowing position (3) is selected, the second step that a plug pipe column is tripped in, a cement plug (2) is plugged on shaft bottom falling materials, the cement plug is plugged, and after the plug pipe column is tripped out, a plug sweeping pipe column assembly is tripped in to fast sweep the cement plug to the windowing position (3), the third step that the plug sweeping pipe column is taken out, a sidetracking pipe column assembly is tripped in to carry out sidetracking windowing, drilling is carried out for 10 m after windowing, and an original well hole (1) is avoided, and the fourth step that the sidetracking pipe column assembly is taken out, a conventional well drilling pipe set assembly is tripped in, drilling and plugging is carried out to the target position depth, and conventional or acid fracturing well completion is carried out after the pipe column is tripped out. After the barrier-avoiding sidetracking technology is adopted, due to the fact that falling materials at the well bottom of an original deep well are avoided, sidetracking is carried out from the side face within the well opening range, and therefore cost for fishing the falling materials is lowered, and time is saved.
Description
Technical field
The present invention relates to a kind of processing method that has complicated blanking for oilfield shaft bottom, be specifically related to limestone etc. compared with the post-processed mode after the sidetracking drilling tool construction method of hard formation and sidetracking.
Background technology
Tahe recovers the oil two factory's oil well finishing drilling degree of depth generally more than 5500m, belongs to typical " two surpassing five height " well, conventionally with bore hole acid fracturing mode completion.Because tubing string is dark, bore hole cave-in, packer can not release envelope, leakage seriously causes the factors such as sand card, in well, blanking is just at increasing year by year, fishing is time and effort consuming not only, fishing success ratio is lower, expense is high, also serious impact oily capacity of well.
The junk forming because of situations such as bit freezing sand bury, open hole packer deblocking is unsuccessful for shaft bottom at present, what conventional method adopted is that the mode of overlapping milling, salvaging, back-off is processed.Due to deep-well and fracture and vug carbonate reservoir existence leakage and the factor of caving in, so difficult treatment.Adhere to processing and will drop into great expense, and long in time limit, efficiency is low, can not recover in time oil well productivity.
Document " Dong's 101 well barefoot laterally drilling techniques " (seeing < < Jiang-Han Area petroleum science and technology > >, in April, 2006) discloses the processing mode that forms blanking during a kind of drilling well.Which has adopted 850 trepans, for the treatment of accident, is the accident forming during drilling well, is not but suitable for and processes the blanking that workover rig forms during well workover.
Chinese patent ZL200620167480.1 discloses the quick THE REPRODUCTION TECHNOLOGY WITH device that a kind of slim-hole deep-well junk cannot be processed.What in this invention, use is that whipstock carries out window sidetracking, and this scheme requires junk near apart from producing well section.
Therefore those skilled in the art are seeking a kind of limestone etc. compared with the method for well fixing after the deep-well blanking of hard formation always, to reduce workover cost as far as possible, and reduce the occurrence rate of disused well.
Summary of the invention
The object of the present invention is to provide a kind of limestone etc. of processing compared with the method that occurs complicated blanking (shaft bottom fish) in the deep-well of hard formation, to overcome in prior art, by fishing, process the various defects that occur in blanking, for example: length consuming time, cost is high, efficiency is low, easily causes disused well.
To achieve these goals, the present invention has adopted following technical scheme: a kind of workover rig is around the method for barrier sidetracking, and it includes following step:
First step: the position of selecting to window, is chosen in At The Height apart from shaft bottom blanking 10-20m and is the barefoot laterally drilling position of windowing;
Second step: be lowered to and beat plug tubing string, cementing plug on the blanking of shaft bottom, trips out and beat after plug tubing string, then be lowered to and sweep plug pipe string combination cement plug is swept to plug to the design position of windowing fast;
Third step: take out and sweep plug tubing string, be lowered to sidetracking pipe string combination and carry out side-drilling windowing, creep into 10m after windowing, avoid former well;
The 4th step: take out sidetracking pipe string combination, be lowered to the combination of conventional drilling pipe group, creep into target zone bit depth, trip out routine or acid fracturing completion after tubing string.
Further, in described third step side-drilling windowing process, after windowing, creep into after 10m, if successfully do not avoid former well (1), window unsuccessful, the second step that need to repeat to play plug and sweep plug, and then continue barefoot laterally drilling until window successfully, finally carry out again the 4th step.
Further, in third step side-drilling windowing process, need to carry out the prevention and treatment measures of the complex situations such as leakage, well slough, tight trip.
Further, in third step side-drilling windowing process, the pressure of the drill is controlled at 0.5-1.5t, 3m controlled drilling rate 1-1.5h/m before sidetracking, controlled drilling rate 3-4h/m afterwards, annular space returns speed control built in 0.6-0.8m/s, on return landwaste and stop cement and determine sidetracking success, often creep into 2m, spudding up and down once, prevents the sticky card of drilling tool.
Further, in the 4th step conventional drilling process, control the pressure of the drill at 5-8t, rotating speed is 45-80r/min, discharge capacity 500-600L/min.
Further, in the 4th step conventional drilling process, when continuous 50min is without the inspection that slowly should pull out of hole of drilling depth or drilling depth, prevent from rubbing drill string; Strict implement is anti-collapse, anti-breaking, anti-sticking, anti-lost, the measures such as well blowout preventing.
Adopted and above-mentionedly after barrier Sidetracking method, owing to having avoided the blanking in former deep-well shaft bottom, in the scope that can drive a well, carried out from the side sidetracking, thereby reduced, salvaged the cost of junk and saved the time.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first combination;
Fig. 2 is the structural representation of the second combination;
Fig. 3 is that deep-well shaft bottom sidetracking is around barrier schematic diagram.
The specific embodiment
Object for a better understanding of the present invention, below in conjunction with background, accompanying drawing and actual condition, is described in detail its structure and function.
This use around barrier sidetracking method need to meet following two kinds of situations: 1, oil well in, continue salvaging blanking (shaft bottom fish) process to the difficulty of target zone position large, the situation that expense is high; 2, residue blanking (shaft bottom fish) at 100m with interior situation.
The present embodiment has specifically been introduced a kind of XJ750 of cooperation workover rig around the method for barrier sidetracking.As shown in Figure 3, owing within the scope of near 20m former pit shaft payzone being former geology producing zone position, adopt single bend PDM to carry out sidetracking deflecting, walk around after former well junk, use conventional drilling tool instead and get out new shaft bottom 4, with this, re-establish the passage of producing zone position and oil well.
First described workover rig comprises the steps: around barrier Sidetracking Technology specifically, and select barefoot laterally drilling point, the position 3 of windowing, is typically chosen in the At The Height apart from shaft bottom blanking 10-20m;
Then, be lowered to and beat plug tubing string, on the blanking of shaft bottom, cementing plug 2, after cementing plug, trip out and beat plug tubing string, be lowered to again and sweep plug pipe string combination cement plug is swept to plug fast to the position 3 of windowing, as shown in Figure 1, described in sweep plug pipe string combination and include successively tricone bit 5, common spiral shell screw drill 6, heavy collar 7 and the drilling rod 8 connecting;
Then, take out and sweep plug tubing string, be lowered to sidetracking pipe string combination and carry out side-drilling windowing, as shown in Figure 2, described sidetracking tubing string includes PDC drill bit 9, single bend PDM brill 10, heavy collar 7 and drilling rod 8, wherein, if geological formations is not hard especially, PDC drill bit also can replace with tricone bit; Described single bend PDM coordinates PDC drill bit or three gear wheels nondirectionally to carry out side-drilling windowing, after windowing, creeps into 10m, avoids former shaft bottom 4; Unsuccessful if window, do not avoid junk and former shaft bottom 4, need to repeat to beat plug, again carry out sidetracking after sweeping plug, until window sidetracking 10m success;
Finally, take out sidetracking pipe string combination, be lowered to the combination of conventional drilling pipe group, bore and fill in to target zone bit depth, trip out routine or acid fracturing completion after tubing string.
Further note that, in the process of second step cementing plug, the standard of cement plug should meet SY/T5587.14-2004 industry standard, and curing time is greater than 48h.
Further note that, in third step side-drilling windowing process, need to carry out the prevention and treatment measures of the complex situations such as leakage, well slough, tight trip.
Further note that, in third step side-drilling windowing process, the pressure of the drill is controlled at 0.5-1.5t, 3m controlled drilling rate 1-1.5h/m before sidetracking, controlled drilling rate 3-4h/m afterwards, annular space returns speed control built in 0.6-0.8m/s, on return landwaste and stop cement and determine sidetracking success, often creep into 2m, spudding up and down once, prevents the sticky card of drilling tool.
Further note that, in the 4th step conventional drilling process, control the pressure of the drill at 5-8t, rotating speed is 45-80r/min, discharge capacity 500-600L/min.
Further note that, in the 4th step conventional drilling (bore hole drilling well) process, when continuous 50min is without the inspection that slowly should pull out of hole of drilling depth or drilling depth, prevent from rubbing drill string; Strict implement is anti-collapse, anti-breaking, anti-sticking, anti-lost, the measures such as well blowout preventing; While stopping boring for some reason, drilling tool must play in sleeve pipe.
Further note that, in the 4th step conventional drilling (bore hole drilling well) process, if turned before proceeding to target zone, occur the oil/gas show situations such as leakage well kick, can determine stop or continuing creeping into according to geological condition.
In the present embodiment trip-out and the process of going into the well, adopted low solids fluid, this drilling fluid need to possess good suspension stability, flow behavior, lubricity, specifically according to hole condition adjustment.For example, density is the mud of 1.16g/cm3, viscosity 40-60s.
Simply introduce the structure of sweeping plug pipe string combination, sidetracking pipe string combination and conventional drilling pipe string combination being applied in above-mentioned activities below.As shown in Figure 1, described in, sweep plug pipe string combination and include connection ground tricone bit, common screw brill, 4 of drill collars and drilling rod successively; As shown in Figure 2, described sidetracking tubing string group is connected ground PDC drill bit, (1.8 °-3 °) single bend PDM brill, 4 of drill collars and drilling rod successively with comprising; Described conventional drilling pipe group combination includes and connects successively ground tricone bit, heavy collar and drilling assembly.
Adopted described in the present embodiment and in Tahe TH12310 well, carried out 750 workover rigs around the test of barrier sidetracking around barrier Sidetracking Technology, result shows from playing plug to amounting to 23 days for starch, with in earlier stage process blanking need within 73 days, compare, saved the plenty of time; In like manner, in TK678 and TH12164 well, application has spent respectively 23 days and 22 days, processes 72 days and 89 days that blanking needs before comparing, and has saved the plenty of time.
The above is only a kind of specific embodiment around barrier Sidetracking of the present invention; it should be pointed out that for those skilled in the relevant art, under the premise without departing from the principles of the invention; trickle modification and the improvement made, also should be considered as belonging to protection scope of the present invention.
Claims (6)
1. workover rig is around a method for barrier sidetracking, and it includes following step:
First step: the position (3) of selecting to window, is chosen in At The Height apart from shaft bottom blanking 10-20m and is the barefoot laterally drilling position of windowing;
Second step: be lowered to and beat plug tubing string, cementing plug on the blanking of shaft bottom (2), cementing plug, and trip out and beat after plug tubing string, then be lowered to and sweep plug pipe string combination cement plug is swept to plug fast to the position of windowing (3);
Third step: take out and sweep plug tubing string, be lowered to sidetracking pipe string combination and carry out side-drilling windowing, creep into 10m after windowing, avoid former shaft bottom (1);
The 4th step: take out sidetracking pipe string combination, be lowered to the combination of conventional drilling pipe group, bore and fill in to target zone bit depth, trip out routine or acid fracturing completion after tubing string.
2. a kind of workover rig as claimed in claim 1 is around the method for barrier sidetracking, wherein, in described third step side-drilling windowing process, after windowing, creep into after 10m, successfully do not avoid former shaft bottom (1), window unsuccessful, the second step that need to repeat to play plug and sweep plug, and then continue barefoot laterally drilling until window successfully, finally carry out again the 4th step.
3. a kind of workover rig as claimed in claim 1, around the method for barrier sidetracking, wherein, in third step side-drilling windowing process, need to be carried out the prevention and treatment measures of the complex situations such as leakage, well slough, tight trip.
4. a kind of workover rig as claimed in claim 1 is around the method for barrier sidetracking, wherein, in third step side-drilling windowing process, the pressure of the drill is controlled at 0.5-1.5t, 3m controlled drilling rate 1-1.5h/m before sidetracking, controlled drilling rate 3-4h/m afterwards, annular space returns speed control built in 0.6-0.8m/s, above returns landwaste and stops cement and determine sidetracking success, often creeps into 2m, spudding up and down once, prevents the sticky card of drilling tool.
5. a kind of workover rig as claimed in claim 1, around the method for barrier sidetracking, wherein, in the 4th step conventional drilling process, is controlled the pressure of the drill at 5-8t, and rotating speed is 45-80r/min, discharge capacity 500-600L/min.
6. a kind of workover rig as claimed in claim 1 is around the method for barrier sidetracking, wherein, in the 4th step conventional drilling process, when continuous 50min is without the inspection that slowly should pull out of hole of drilling depth or drilling depth, prevents from rubbing drill string; Strict implement is anti-collapse, anti-breaking, anti-sticking, anti-lost, well blowout preventing measure.
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| CN201410206124.5A CN103939018B (en) | 2014-05-15 | 2014-05-15 | A kind of workover rig is around barrier Sidetracking |
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| CN201410206124.5A CN103939018B (en) | 2014-05-15 | 2014-05-15 | A kind of workover rig is around barrier Sidetracking |
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| CN103939018A true CN103939018A (en) | 2014-07-23 |
| CN103939018B CN103939018B (en) | 2016-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132736A (en) * | 2015-09-01 | 2015-12-09 | 河南科技大学 | Dispersed copper composite material and preparation method thereof |
| CN105822254A (en) * | 2016-04-08 | 2016-08-03 | 辛玉建 | Hanging plugging device and method for petroleum industry |
| CN111305272A (en) * | 2019-12-20 | 2020-06-19 | 汪栋 | Large-diameter inclined pipe for well accident treatment and construction method thereof |
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| CN200982157Y (en) * | 2006-12-14 | 2007-11-28 | 中国石油天然气股份有限公司 | Quick production-resuming device for deep well litter of small well hole |
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2014
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| CN200982157Y (en) * | 2006-12-14 | 2007-11-28 | 中国石油天然气股份有限公司 | Quick production-resuming device for deep well litter of small well hole |
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| 宋维华: "可替代打水泥塞侧钻的裸眼侧钻新方式", 《西部探矿工程》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132736A (en) * | 2015-09-01 | 2015-12-09 | 河南科技大学 | Dispersed copper composite material and preparation method thereof |
| CN105822254A (en) * | 2016-04-08 | 2016-08-03 | 辛玉建 | Hanging plugging device and method for petroleum industry |
| CN105822254B (en) * | 2016-04-08 | 2018-08-31 | 中油科恒石油工程技术有限公司 | Petroleum industry is used and vacantly beats plug device and method |
| CN111305272A (en) * | 2019-12-20 | 2020-06-19 | 汪栋 | Large-diameter inclined pipe for well accident treatment and construction method thereof |
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| CN103939018B (en) | 2016-08-17 |
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