CN103711452B - A kind of gel slug packing well control method - Google Patents

A kind of gel slug packing well control method Download PDF

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Publication number
CN103711452B
CN103711452B CN201310753585.XA CN201310753585A CN103711452B CN 103711452 B CN103711452 B CN 103711452B CN 201310753585 A CN201310753585 A CN 201310753585A CN 103711452 B CN103711452 B CN 103711452B
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China
Prior art keywords
pit shaft
packing
gel slug
gel
slug
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CN201310753585.XA
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CN103711452A (en
Inventor
刘绘新
雷鸣
何博逾
王健功
袁征
赖汶龙
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Southwest Petroleum University
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Southwest Petroleum University
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Abstract

The invention discloses a kind of gel slug packing well control method, it comprises the following steps: S1, occur spill and leakage with deposit complicated pit shaft situation time, in pit shaft, set up gel slug; S2, circulating with choke exhaust is carried out to the top pit shaft after packing; S3, within the safety work time that pit shaft packing provides, carry out stopping boring leak stopping preparation; S4, by after breaking glue to gel slug and removing pit shaft packing, extrusion is adopted to carry out plugging operations; S5, carry out throttle well killing with weighted drilling fluid.The invention has the beneficial effects as follows: removing pit shaft packing by the packing of gel slug pit shaft and broken glue, providing a kind of selection completely newly for processing complicated pit shaft situation; Gel slug blocks Mobile Communication road on oil gas, effectively controls overflow in shaft bottom, for leak stopping kill-job provides the safety work time, reduces well control safety risk; There is novel technical thought, reliably technical scheme, be conducive to forming practical engineering.

Description

A kind of gel slug packing well control method
Technical field
The present invention relates to Oil/gas Well Stress control (well control) technical field, particularly a kind of fracture-type reservoir spill and leakage that is applicable to is with the gel slug packing well control method depositing pit shaft complex situations.
Background technology
For fracture-type reservoir, the existence of hole, seam makes to have good passage between pit shaft and reservoir, relative to the conventional well control techniques of permeability reservoir feature, all there is sizable difference in fracture-type reservoir well control technique in the well control theory of overflow mechanism, use, the technical system of foundation etc.
Because fracture-type reservoir does not meet seepage flow condition, filtrational resistance is very little, causes ' Safe Density Windows narrow: under condition of negative pressure, show as typical negative pressure continuous overflow (only overflow and do not leak); Typical leakage (only leak and do not overflow) is shown as under positive pressure; Typical gravity displacement overflow (having overflows leakage) is shown as under balance (or closely balancing) condition.This just causes overflow, leakage alternately occurs (spill and leakage is with depositing), and pit shaft is difficult to keep equipoise for a long time.Adopt conventional well control techniques (discharging method throttle well killing), because wellbore pressure accurately controls difficulty, easily occur the problems such as the processing time is long, cost is high, have a big risk, badly influence well control safety.
The key of fracture-type reservoir well control technique implements effective leak stopping kill-job.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of gel slug packing well control method is provided, the safety work time is provided for stopping boring leak stopping (as allocated stifled slurry, removing drill string etc.), improving overflow kill-job success rate, reduce well control safety risk, solving conventional well control techniques at fracture-type reservoir spill and leakage with depositing complicated pit shaft situation produced problem.
Object of the present invention is achieved through the following technical solutions: a kind of gel slug packing well control method, and it comprises the following steps:
S1, occurring that spill and leakage is with when depositing complicated pit shaft situation, sets up gel slug in pit shaft, packing pit shaft, block Mobile Communication road on oil gas, overflow is controlled in shaft bottom;
S2, circulating with choke exhaust is carried out to the top pit shaft after packing, guarantee that top pit shaft is clean;
S3, within the safety work time that pit shaft packing provides, carry out stopping boring leak stopping preparation;
S4, by after breaking glue to gel slug and removing pit shaft packing, adopt extrusion to carry out plugging operations, improve bearing capacity;
S5, carry out throttle well killing with weighted drilling fluid, restoration and reconstruction wellbore pressure equilibrium relation.
The described operating procedure setting up gel slug in pit shaft is: inject gel by drill string at lower wellbore, the gel slug of static rear formation sufficient length, packing pit shaft.
Described breaks the method for operating of glue releasing pit shaft packing for being injected gel breaker by drill string to gel slug successively broken glue to gel slug, removes the UNICOM of pit shaft packing, recovery pit shaft.
Described plugging operations adopts extrusion.
The present invention has the following advantages:
1, the gel slug pit shaft packing method of the present invention's proposition, can carry out the packing of gel slug pit shaft according to requirement of engineering or pit shaft packing removed by broken glue, provides a kind of selection completely newly for processing complicated pit shaft situation.
2, the fracture-type reservoir complex situations well control method of the present invention's proposition, adopt the packing of gel slug pit shaft to block on oil gas and move (above altering) passage, overflow is effectively controlled in shaft bottom, for leak stopping kill-job provides the safety work time, reduce well control safety risk, effectively can process fracture-type reservoir spill and leakage with the complex situations of depositing pit shaft, improve overflow kill-job success rate, reduce well control safety risk.
3, the present invention has novel technical thought, reliably technical scheme, is conducive to forming practical engineering.
Accompanying drawing explanation
Fig. 1 is for occurring that spill and leakage is with depositing complicated pit shaft situation schematic diagram.
Fig. 2 is the structural representation setting up gel slug in pit shaft.
Fig. 3 is pit shaft situation schematic diagram after pit shaft packing, throttling exhaust.
Fig. 4 be to gel slug break glue remove pit shaft packing time structural representation.
Fig. 5 is the structural representation adopting extrusion to carry out plugging operations.
Fig. 6 is the structural representation adopting weighted drilling fluid to carry out throttle well killing.
In figure, 1-conduit, 2-blowout preventer set, 3-four-way, 4-flap type, 5-sleeve pipe, 6-drill string, 7-drilling fluid, 8-reservoir, 9-crack, 10-gas overflow, 11-gel slug, 12-plugging slurry, 13-weighted drilling fluid.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, and protection scope of the present invention is not limited to the following stated:
As shown in Fig. 1 ~ Fig. 6, for conventional well body structure, lower wellbore is reservoir 8, has crack 9 in reservoir 8, and upper wellbore is sleeve pipe 5, sleeve pipe 5 top is connected with four-way 3 and blowout preventer set 2 in turn, blowout preventer set 2 top is connected with conduit 1, and four-way 3 connects choke manifold by flap type 4, and drill string 6 is positioned at pit shaft, with pit shaft looping space, drilling fluid 7 injects in drill string 6.
Embodiment:
A kind of gel slug packing well control method, it comprises the following steps:
S1, meet spill and leakage with when depositing complicated pit shaft situation (as fracture-type reservoir, namely reservoir 8 exists crack 9, has leakage, has gas overflow 10) boring, first implement throttling exhaust, plugging while drilling; If bearing capacity reaches the requirement of weighted drilling fluid, then carry out throttle well killing with weighted drilling fluid, restoration and reconstruction wellbore pressure equilibrium relation, is shown in Fig. 1;
If S2 plugging while drilling is unsuccessful, pit shaft is caused to be vented the requirement unclean, bearing capacity does not reach weighted drilling fluid, adopt circulating with choke mode, inject gel, until form gel slug 11 at lower wellbore, packing pit shaft, blocking-up oil gas move (above altering) passage, spill and leakage complex situations is effectively controlled in shaft bottom, sees Fig. 2;
S3, on carry drill string 6 and depart from gel slug 11, circulating with choke exhaust is carried out to the top pit shaft after packing, guarantees that top pit shaft is clean, well head is not with pressure, see Fig. 3;
S4, within the safety work time that pit shaft packing provides, carry out stopping boring leak stopping preparation, as allocated stifled slurry, removing drill string 6 etc., see Fig. 3;
S5, under enter drill string 6 and contact gel slug, inject gel breaker, successively glue carried out brokenly to gel slug, until remove pit shaft packing, implement closing well, see Fig. 4;
S6, employing extrusion carry out plugging operations, the crack 9 of plugging slurry 12 shutoff reservoir 8, improve pit shaft bearing capacity, until reach the requirement of weighted drilling fluid, see Fig. 5;
S7, employing weighted drilling fluid 13 carry out throttle well killing, and restoration and reconstruction wellbore pressure equilibrium relation, is shown in Fig. 6.
The described method of operating utilizing gel slug to carry out pit shaft packing is: when needing to carry out pit shaft packing, utilize the feature that gel good fluidity, structural strength are high, gel is injected at the rational position of lower wellbore by drill string 6, the gel slug of static rear formation sufficient length, can effective packing pit shaft.It is composite that described gel can select polymeric material to carry out, the sub-gel of such as light.Gel slug rational position should consider concrete pit shaft situation, such as, in the sleeve pipe of upper strata or stable well section, and reserved gel slug length space.
Gel slug length can be calculated as follows:
L = ΔPD 4 * 9.8 * 10 - 5 θ
L--gel slug effective length in formula, m; △ P--gel slug pressure reduction, MPa;
D--mineshaft diameter, m; θ--gel static yield stress, g/cm 2.
Such as: known gel slug pressure reduction 3MPa, mineshaft diameter 0.152m, gel static yield stress 5g/cm 2, then gel slug length should be 232m.
Described the method for operating that glue removes pit shaft packing is broken to gel slug be: inject gel breaker to gel slug successively broken glue by drill string 6, after broken glue, effectively can remove pit shaft packing, recover the UNICOM of pit shaft.Gel breaker can select oxidation gel breaker, as ammonium persulfate; Successively glue is broken to whole gel slug length.

Claims (3)

1. a gel slug packing well control method, is characterized in that: it comprises the following steps:
S1, occurring that spill and leakage is with when depositing complicated pit shaft situation, sets up gel slug (11) in pit shaft, packing pit shaft, block Mobile Communication road on oil gas, overflow is controlled in shaft bottom;
S2, circulating with choke exhaust is carried out to the top pit shaft after packing, guarantee that top pit shaft is clean;
S3, within the safety work time that pit shaft packing provides, carry out stopping boring leak stopping preparation;
S4, by after breaking glue to gel slug and removing pit shaft packing, adopt extrusion to carry out plugging operations, improve bearing capacity;
S5, carry out throttle well killing with weighted drilling fluid, restoration and reconstruction wellbore pressure equilibrium relation.
2. a kind of gel slug packing well control method according to claim 1, it is characterized in that: the described operating procedure setting up gel slug in pit shaft is: inject gel by drill string (6) at lower wellbore, the gel slug (11) of static rear formation sufficient length, packing pit shaft.
3. a kind of gel slug packing well control method according to claim 1, it is characterized in that: described breaks the method for operating of glue releasing pit shaft packing for being injected gel breaker by drill string (6) to gel slug (11) successively broken glue to gel slug, removes the UNICOM of pit shaft packing, recovery pit shaft.
CN201310753585.XA 2013-12-31 2013-12-31 A kind of gel slug packing well control method Expired - Fee Related CN103711452B (en)

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Publication number Priority date Publication date Assignee Title
CN106703743B (en) * 2015-11-18 2019-05-07 中国石油天然气股份有限公司 Well control method is isolated in gel
CN109630063A (en) * 2018-10-31 2019-04-16 中国石油集团川庆钻探工程有限公司 A kind of method that gel solids slug compartment makes a trip
CN114109357B (en) * 2021-12-17 2024-05-24 中国石油大学(北京) Deepwater gas invasion simulation experiment device and gas invasion judgment method
CN115653536B (en) * 2022-09-30 2024-06-07 中国石油天然气集团有限公司 Circulating pressure control method and system for liquid rubber plug packing production layer in drilling process
CN117888842A (en) * 2024-03-18 2024-04-16 中国石油大学(华东) Ultra-deep well shaft pressure control method and system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6431280B2 (en) * 1998-12-21 2002-08-13 Geoffrey Stanley Bayliss Method for placement of blocking gels or polymers at specific depths of penetration into oil and gas, and water producing formations
CN101086210A (en) * 2007-07-13 2007-12-12 辽河石油勘探局 Profile control and water plugging technology for coal bed gas
CN101397896A (en) * 2007-09-30 2009-04-01 台湾中油股份有限公司 Water-shutoff method for sealing gas well effluent section by combination of incline cement and gas injection compression
CN101435317A (en) * 2008-12-12 2009-05-20 中国石油集团川庆钻探工程有限公司 Loss return drop-out cross linked gel plugging process
CN102876304A (en) * 2012-09-18 2013-01-16 中国石油化工股份有限公司 Bottom water plugging agent system and process for horizontal well
CN103160261A (en) * 2011-12-15 2013-06-19 中国石油天然气股份有限公司 Preparation and use method of downhole intelligent plug
CN103289013A (en) * 2013-05-30 2013-09-11 西南石油大学 Gel and method thereof used for plugging and method for plugging killing well

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6431280B2 (en) * 1998-12-21 2002-08-13 Geoffrey Stanley Bayliss Method for placement of blocking gels or polymers at specific depths of penetration into oil and gas, and water producing formations
CN101086210A (en) * 2007-07-13 2007-12-12 辽河石油勘探局 Profile control and water plugging technology for coal bed gas
CN101397896A (en) * 2007-09-30 2009-04-01 台湾中油股份有限公司 Water-shutoff method for sealing gas well effluent section by combination of incline cement and gas injection compression
CN101435317A (en) * 2008-12-12 2009-05-20 中国石油集团川庆钻探工程有限公司 Loss return drop-out cross linked gel plugging process
CN103160261A (en) * 2011-12-15 2013-06-19 中国石油天然气股份有限公司 Preparation and use method of downhole intelligent plug
CN102876304A (en) * 2012-09-18 2013-01-16 中国石油化工股份有限公司 Bottom water plugging agent system and process for horizontal well
CN103289013A (en) * 2013-05-30 2013-09-11 西南石油大学 Gel and method thereof used for plugging and method for plugging killing well

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