CN108979585A - A kind of method for blocking of casing damage well set breakpoint - Google Patents
A kind of method for blocking of casing damage well set breakpoint Download PDFInfo
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- CN108979585A CN108979585A CN201810846368.8A CN201810846368A CN108979585A CN 108979585 A CN108979585 A CN 108979585A CN 201810846368 A CN201810846368 A CN 201810846368A CN 108979585 A CN108979585 A CN 108979585A
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- blocking agent
- blocking
- set breakpoint
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- breakpoint
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The present invention provides a kind of method for blocking of casing damage well set breakpoint, including S1 tripping in drilling bridging plug below set breakpoint, and below back-up sand to set breakpoint at 5m；Oil pipe and cannula type packer are above set breakpoint and setting；S2 oil pipe squeezes clear water, verifying set breakpoint and its water absorbing capacity；S3 squeezes low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B；S4 extracts cannula type packer intubation, and stays plug in pit shaft, and backwash pit shaft plays flowline；The low frictional resistance blocking agent A of S5 and low-viscosity (mobile) liquid bridge plug blocking agent B occurs to form solidified body after non-constricted heat cure is reacted 10-24 hours at normal temperature；S6 tripping in helicoid hydraulic motor, which bores, removes cannula type packer, solidified body and drilling bridging plug；S7 clear water pressure testing 0~0.5MPa of 15MPa, 30min pressure drop is qualification, lower to have pumped well；It is such as unqualified, it blocks again.The blocking method can reduce blocking agent injection frictional resistance, improve blocking agent injection, realize high-intensitive ungauged regions solidification into the blocking agent behind crack, realize the method permanently blocked.
Description
Technical field
The invention belongs to oil/gas well casing damaged well watertightness treatment fields, are related to a kind of closure side of casing damage well set breakpoint
Method.
Background technique
It perforates caused by oil-well strata output corrosion internal surface of sleeve pipe damaged, there are cementing concrete ring, pipe other places outside casing
Layer water flows into pit shaft through set breakpoint by cement sheath crack, such casing damaged well in chemical plugging squeezing work progress, squeeze by blocking agent
Injection pressure power is high, and difficulty of construction is big；Blocking agent bonding quality difference is easy to produce new crackle, and water flooding is caused to flow backward pit shaft.Using low
Leak stopping success rate and effective blocking time can be improved in frictional resistance high intensity blocking agent.
Such well leak stopping at present predominantly squeezes oil-well cement class blocking agent or cross-linked gel class blocking agent.Patent
201310545419.0 disclose a kind of preparation method of crosslinking curing set damage sealing agent, prepare A agent first: according to mass ratio 21
~27: 4~10: 43~49 ratio weighs urea, rice meal and formaldehyde respectively, and concentration of formaldehyde is not less than 36%, then 29
DEG C~31 DEG C at the 17/27~17/21 of weighed urea is mixed with the weighed all rice meals of institute and formaldehyde, then be with concentration
For the pH value of 50% sodium hydrate aqueous solution adjustment mixed liquor to 7.7~7.9, constant-speed heating is to 89 DEG C~91 DEG C and constantly stirs
Mix, keep the temperature 29~31 minutes at 89 DEG C~91 DEG C, then with the pH value of formic acid adjustment mixed liquor to 6.4~6.6, after adjusting acid 10
In~20 minutes, examine whether mixed liquor reaches reaction end with room temperature clear water, the mixed liquor for reaching reaction end instills clear water
It is interior to play white mist, when inspection reaches reaction end, be cooled to 70 DEG C~80 DEG C immediately, then with concentration for 50% hydrogen-oxygen
Change the pH value of sodium water solution adjustment mixed liquor to 7.4~7.8, is subsequently added into remaining urea and stirs evenly, constant temperature plastic, at
35 DEG C~40 DEG C are cooled to after glue immediately, is then placed in the sealing of glue bucket, is placed in shady place preservation, A agent is made；Then it makes
Standby B agent: according to the ratio of mass ratio 1~7: 1~7: 17~23: 17~23 weigh respectively bentonite, flyash, G class g cement and
Water adds ammonium chloride and citric acid in the mixed liquor of bentonite, flyash, G class g cement and water, stirs evenly, B is made
Agent；A agent and B agent are finally mixed to prepare sealing agent；It is that the organic crosslinking blocking agent of squeezing is blocked.
Patent 201610342939.5 disclose it is a kind of from cementing sealing agent and blocking method, it is described from cementing sealing agent,
Each component mass percentage content are as follows: acrylamide monomer is 25~35%, and crosslinking agent is 0.1~0.5%, sodium carbonate 0.2
~0.5%, bentonite is 20~25%, and high molecular polymer is 2~5%, and pre-crosslinked gel particle is 3~5%, detailed catalogue carbonic acid
Calcium is 30~35%, and fiber is 5~8%, and initiator is 0.1~0.5%, by above-mentioned raw materials be uniformly mixed from cementing leak stopping
Agent, the sealing agent utilize formation temperature, make intermolecular generation polymerization reaction, and being formed has certain water-swelling property and resistance to compression
The rubber plug of intensity, to block lost-circulation zone；To squeeze a kind of stratum crosslinking organogel.
Patent 201610494679.3 discloses well cementation plugging material and preparation method thereof, blocking method and cement slurry,
The plugging material includes leak stopping particle, fiber, polymer fluid loss agent and cement；Relative to the cement of 100 parts by weight,
The content of the leak stopping particle is 2~6 parts by weight, and the content of the fiber is 0.25~0.6 parts by weight, and the polymer drop is lost
The content of aqua is 5~10 parts by weight；Wherein, the partial size that there are the leak stopping particle two or more to be sequentially reduced, wherein
The 1st kind of partial size is the 1/3-2/3 of leak stopping fracture width in the leak stopping particle, and n partial size is described in the leak stopping particle
The 1/3-2/3 of (n-1)th kind of partial size, n >=2, and n are natural number；The weight of the particle of every kind of partial size in the leak stopping particle
It is identical.The plugging material reduces operating cost, guarantees that height is returned in design, realizes sealing requirement, especially the guarantee crack 1mm or less
Effective sealing；It is that oil-well cement improves class blocking agent.
But when above technical scheme is applied to internal surface of sleeve pipe corrosion more serious casing damaged well, it is primarily present following problems: pit shaft
Bearing capacity reduces, and outside tube water mud ring crack seam or stratum water absorbing capacity are poor, and difficulty of construction is big for chemical plugging squeezing；It must for this purpose, having
Design and develop out related precisely card envelope squeezing technique and low frictional resistance high intensity blocking agent, not only require blocking agent that can infuse into more wanting
Seeking blocking agent, bonding capacity is excellent under formation conditions, to improve chemical plugging success rate and block validity period.
Summary of the invention
In view of the foregoing defects the prior art has, the present invention provides a kind of closure sides of casing damage well set breakpoint
Method, the object of the invention inject frictional resistance first is that reducing blocking agent, improve blocking agent injection, realize high-intensitive nothing into the blocking agent behind crack
Shrink solidification；Purpose is second is that realize that oil well set breakpoint and water exit permanently block, preventing shallow seated groundwater from flowing backward leads to oil well productivity
Decline.
The technical solution adopted in the present invention is as follows:
A kind of method for blocking of casing damage well set breakpoint, includes the following steps:
S1. the tripping in drilling bridging plug below set breakpoint, and below back-up sand to set breakpoint at 5m；The tripping in above set breakpoint
Oil pipe and cannula type packer, and make cannula type packer set on oil pipe；
S2. oil pipe squeezes clear water, verifying set breakpoint and its water absorbing capacity；
S3. oil pipe squeezes low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B to set breakpoint pit shaft and stratum；
S4. the intubation for extracting cannula type packer stays plug in cannula type packer with well-sinking, and backwash pit shaft rises fuel-displaced
Pipe；
S5. non-constricted heat cure reaction occurs at the formation temperature for low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B
10-24 hours；
S6. tripping in helicoid hydraulic motor, which bores, removes cannula type packer, solidified body and drilling bridging plug；
S7. 0~0.5MPa of clear water pressure testing 15MPa, 30min pressure drop is qualification, lower to have pumped well；It is such as unqualified, it blocks again.
In the step S1 below the breakpoint of drilling bridging plug tripping in set at 30m；Oil pipe is at 10m above set breakpoint.
The squeezing amount of clear water is 1m in the step S23, discharge capacity 50L/min-150L/min.
The squeezing total amount 10-20m of low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B in the step S33, discharge capacity is
50L/min-150L/min, squeeze pressure are no more than 25MPa.
Low frictional resistance blocking agent A in the step S3, is made of following component by weight percentage: fluid loss agent 3-5% subtracts
Resist 0.1%-0.2%, remaining is micro-expansion cement dry powder.
The partial size of the micro-expansion cement dry powder is less than 40 microns, cubical expansivity 0-0.2%.
Low-viscosity (mobile) liquid bridge plug blocking agent B is a kind of non-constricted exothermic reaction resin in the step S3, by weight percentage
Meter, is made of the liquid resin of 85-90% and the curing agent of 10-15%.
The liquid viscosity of low-viscosity (mobile) liquid bridge plug blocking agent B is 12-28MPa.s in the step S3.
The two-way packing of pit shaft, low-viscosity (mobile) liquid bridge can be realized after extracting intubation in cannula type packer in the step S4
It can be coagulated with cured wait after filling in blocking agent B squeezing.
Beneficial effects of the present invention:
The present invention is injected using low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B, is reduced blocking agent and is injected frictional resistance, improves
Blocking agent injection realizes high-intensitive ungauged regions solidification into the blocking agent behind crack；And gelation time is controllable, compression strength after solidification
Height, drillability are strong.Being injected using cannula type packer can be achieved set breakpoint and the accurate closure of water-yielding stratum, extract after squeezing
Intubation can be achieved with pressure wait and coagulate, and reduce construction safety risk, and prevention and treatment blocking agent, which is returned, spits pit shaft, improve blocking agent cementing strength；It is real
Show oil well set breakpoint and water exit permanently blocks, prevents shallow seated groundwater reverse irrigation from oil well productivity being caused to decline.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is implementation exemplary diagram of the invention.
Description of symbols
1, oil pipe；2, cannula type packer；3, drilling bridging plug；4, casing；5, table set；6, artificial bottom of a well.
Embodiment 1
A kind of method for blocking of casing damage well set breakpoint, includes the following steps:
S1. the tripping in drilling bridging plug 3 below set breakpoint, and below back-up sand to set breakpoint at 5m；In the case where covering above breakpoint
Enter oil pipe 1 and cannula type packer 2, and keeps cannula type packer 2 setting on oil pipe 1；
S2. oil pipe 1 squeezes clear water, verifying set breakpoint and its water absorbing capacity；
S3. oil pipe 1 squeezes low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B to set breakpoint pit shaft and stratum；
S4. the intubation for extracting cannula type packer 2 stays plug in cannula type packer 2 with well-sinking, and backwash pit shaft rises
Oil pipe 1；
S5. non-constricted heat cure reaction 10-24 occurs at normal temperature for low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B
Solidified body is formed after hour；
S6. tripping in helicoid hydraulic motor, which bores, removes cannula type packer 2, solidified body and drilling bridging plug 3；
S7. 0~0.5MPa of clear water pressure testing 15MPa, 30min pressure drop is qualification, lower to have pumped well；It is such as unqualified, it blocks again.
The blocking method can reduce blocking agent injection frictional resistance, guarantee the outer cement gap ring of enough blocking agent A sleeve pipes and stratum,
It blocks stratum and carrys out aquaporin.Volume is not shunk after low viscosity liquid bridge plug blocking agent B solidifies around set breakpoint, thermo-chemical stability
By force, it can be achieved that permanent block.Injecting achievable set breakpoint and the accurate closure of water-yielding stratum, squeezing using cannula type packer terminates
Extract afterwards intubation can be achieved it is with pressure wait solidifying, reduce construction safety risk, prevention and treatment blocking agent, which is returned, spits pit shaft, and it is cementing strong to improve blocking agent
Degree；It realizes oil well set breakpoint and water exit permanently blocks, prevent shallow seated groundwater reverse irrigation from oil well productivity being caused to decline.
Embodiment 2
On the basis of embodiment 1, as shown in Figure 1, it is described
In the step S1 below the breakpoint of 3 tripping in of drilling bridging plug set at 30m；Oil pipe 1 is at 10m above set breakpoint.
The squeezing amount of clear water is 1m in the step S23, discharge capacity 50L/min-150L/min.
The squeezing total amount 10-20m3 of low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B, discharge capacity are in the step S3
50L/min-150L/min, squeeze pressure are no more than 25MPa.
The wherein low frictional resistance blocking agent A, is made of following component by weight percentage: fluid loss agent 3-5% (10L, at
All American-European company of section), drag reducer 0.1%-0.2% (606L, Landy company), remaining for micro-expansion cement dry powder (JHWPZ, four
The good magnificent cement in river), the partial size of the micro-expansion cement dry powder is less than 40 microns, cubical expansivity 0-0.2%.The low frictional resistance is stifled
Injection can be improved in agent A, reduces injection frictional resistance and operation pressure.The low-viscosity (mobile) liquid bridge plug blocking agent B is a kind of non-constricted hair
Thermal response resin is made of following component by weight percentage: liquid resin 85-90% (ERS, Beijing Yong Yuan think) Gu+
Agent 10-15% (GS-1, Beijing Yong Yuan think)；The liquid viscosity of the low-viscosity (mobile) liquid bridge plug blocking agent B is 12-28MPa.s.It should
Liquid resin and low frictional resistance cement slurry compatibility, can periodically generate heat crosslinking at a temperature of 20-90 DEG C, realize right angle solidification, block by force
Spend 30MPa or more.The present invention is injected using low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B, is reduced blocking agent and is injected frictional resistance,
Blocking agent injection is improved, realizes high-intensitive ungauged regions solidification into the blocking agent behind crack；And gelation time is controllable, resistance to compression after solidification
Intensity is high, and drillability is strong.
The two-way packing of pit shaft, low-viscosity (mobile) liquid can be realized after extracting intubation in cannula type packer 2 in the step S4
Bridge plug blocking agent B can coagulate after squeezing with cured wait, and effectively prevent stratum blocking agent to return and spit, and influence to solidify quality and block strong
Degree.
Above-mentioned casing damage well set breakpoint and exhalant canal method for blocking, include the following steps:
1) set breakpoint below 30m locate tripping in drilling bridging plug 3, back-up sand to set breakpoint lower section 5m at；Oil pipe 1 is with cannula type
Packer 2 is setting at 10m in set breakpoint；
2) oil pipe 1 squeezes clear water 1m3, discharge capacity 50L/min-150L/min records pressure drop data after termination of pumping, verifying set breakpoint
And its water absorbing capacity.
3) oil pipe 1 amounts to 10-20m to low frictional resistance blocking agent A+ low-viscosity (mobile) liquid bridge plug blocking agent B is squeezed3, and sealed in cannula type
Plug, discharge capacity 50L/min-150L/min are stayed every 2 well-sinking of device, pressure is no more than 25MPa；
4) non-constricted heat cure reaction 10-24 occurs at normal temperature for low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B small
When after form solidified body；
5) tripping in drilling tool, which bores, removes cannula type packer 2+ solidified body+drilling bridging plug 3；
6) it is qualification that clear water pressure testing 15MPa, 30min pressure drop, which are less than 0.5MPa, lower to have pumped well.
Embodiment 3
By taking China celebrates oil field YC9-3 well as an example, which goes into operation in July, 2007, mined bed Y10, and initial stage produces liquid 21m3 daily,
Day oil-producing 5.6t, aqueous 68%, saliferous 33000mg/L, hydrodynamic face 1091m, in April, 2016, set was broken, aqueous to rise to 100%,
Saliferous is down to 5400mg/L.In June, 2017, engineering log, showed 1120-1285m there are more than 10 perforation, perforated section is located at oil
The above ZL water layer section of interval.
Set breakpoint and the outer channeling water channel of pipe are blocked using drag reduction cement and liquid bridging plug blocking agent.
Construction procedure is as follows:
S1 acts former well casing column；
S2 drifting, Φ 118mm × 1.5m gauguste cutter drifting to artificial bottom of a well 6；
4 pressure testing of S3 casing: 15MPa, pressure stabilizing 30min are suppressed, it is qualification that pressure drop, which is less than 0.5MPa,；
S4 seeks the broken section water suction situation of set；
S5 pumping covers broken section: covering broken section by the analysis of liquid measure, saliferous and fluid change and goes out aqueous condition；
S6 pumping payzone perforated interval: changed by saliferous and exclude payzone water outlet possibility；
Drilling bridging plug 3 (the above 50m in payzone perforated interval top circle) under S7；
S8 drilling bridging plug 3 is setting and tests envelope, back-up sand.
Change stifled drilling tool under S9；
S10 squeezes blocking agent: squeezing low frictional resistance blocking agent A+ low-viscosity (mobile) liquid bridge plug blocking agent B and amounts to 19m3, clear water replaces in oil pipe
Blocking agent, cannula type packer well-sinking stay plug；
S11 closing well is with pressure to wait solidifying 72h；
S12 visits slug position；
S13 bores blocking agent plug: being drilled into the entirety pressure testing of sand face, after pressure testing 15MPa is qualified, acts drilling tool；
S14 sand washing；
S15 pumping: plugging effect is verified according to pumping situation；
S16 bores bridge plug: drifting to artificial bottom of a well 6；
Well has been pumped under S17.
After the broken section water-yielding stratum of well set successfully blocks, production capacity is effectively restored, daily output liquid 12.5m3, day oil-producing 1.6t,
Aqueous 86.8%.
Fluid loss agent, drag reducer, micro-expansion cement dry powder, liquid resin and curing agent of the present invention are oil gas field
The common agents of industry can be bought on the market.
Claims (9)
1. a kind of method for blocking of casing damage well set breakpoint, characterized by the following steps:
S1. the tripping in drilling bridging plug (3) below set breakpoint, and below back-up sand to set breakpoint at 5m；The tripping in above set breakpoint
Oil pipe (1) and cannula type packer (2), and keep cannula type packer (2) setting on oil pipe (1)；
S2. oil pipe (1) squeezes clear water, verifying set breakpoint and its water absorbing capacity；
S3. oil pipe (1) squeezes low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B to set breakpoint pit shaft and stratum；
S4. the intubation for extracting cannula type packer (2) stays plug in cannula type packer (2) with well-sinking, and backwash pit shaft rises
Oil pipe (1)；
S5. non-constricted heat cure reaction 10-24 hours occurs at normal temperature for low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B
After form solidified body；
S6. tripping in helicoid hydraulic motor is bored except cannula type packer (2), solidified body and drilling bridging plug (3)；
S7. 0~0.5MPa of clear water pressure testing 15MPa, 30min pressure drop is qualification, lower to have pumped well；It is such as unqualified, it blocks again.
2. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S1
Drilling bridging plug (3) tripping in covers below breakpoint at 30m；Oil pipe (1) is at 10m above set breakpoint.
3. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S2
The squeezing amount of clear water is 1m3, discharge capacity 50L/min-150L/min.
4. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S3
The squeezing total amount 10-20m of low frictional resistance blocking agent A and low-viscosity (mobile) liquid bridge plug blocking agent B3, discharge capacity 50L/min-150L/min, squeezing
Pressure is no more than 25MPa.
5. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S3
Low frictional resistance blocking agent A, is made of following component by weight percentage: fluid loss agent 3-5%, drag reducer 0.1%-0.2%, remaining
For micro-expansion cement dry powder.
6. a kind of method for blocking of casing damage well set breakpoint as claimed in claim 5, it is characterised in that: the microdilatancy water
The partial size of mud dry powder is less than 40 microns, cubical expansivity 0-0.2%.
7. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S3
Low-viscosity (mobile) liquid bridge plug blocking agent B is a kind of non-constricted exothermic reaction resin, by weight percentage, by the liquid of 85-90%
The curing agent of resin and 10-15% composition.
8. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S3
The liquid viscosity of low-viscosity (mobile) liquid bridge plug blocking agent B is 12-28MPa.s.
9. a kind of method for blocking of casing damage well set breakpoint as described in claim 1, it is characterised in that: in the step S4
The two-way packing of pit shaft can be realized in cannula type packer (2) after extracting intubation, after low-viscosity (mobile) liquid bridge plug blocking agent B is squeezed
It can be coagulated with cured wait.
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| CN110396399A (en) * | 2019-06-18 | 2019-11-01 | 中国石油天然气股份有限公司 | A kind of big leakage set damage section plugging material of oil-water well and method for blocking |
| CN112681996A (en) * | 2019-10-18 | 2021-04-20 | 中国石油天然气股份有限公司 | Casing leakage repairing method |
| CN110725663A (en) * | 2019-11-06 | 2020-01-24 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
| CN111075393A (en) * | 2019-12-18 | 2020-04-28 | 中国石油天然气股份有限公司 | Oil-gas field casing damage well long well section plugging resin repair process |
| CN111075393B (en) * | 2019-12-18 | 2021-11-30 | 中国石油天然气股份有限公司 | Oil-gas field casing damage well long well section plugging resin repair process |
| CN111485852A (en) * | 2020-04-27 | 2020-08-04 | 中国石油天然气股份有限公司 | Oil-gas well casing liquid resin plugging squeezing tool and construction process |
| CN111927384A (en) * | 2020-07-06 | 2020-11-13 | 大庆飞陆科技有限公司 | High-strength pure liquid plugging agent plugging process for plugging leaking layer and water plugging |
| CN111827924A (en) * | 2020-08-04 | 2020-10-27 | 中国石油天然气股份有限公司 | Leakage stopping method for oil well multi-layer casing damage section |
| CN111963099A (en) * | 2020-08-19 | 2020-11-20 | 中国石油天然气股份有限公司 | Construction method of temporary plugging resin system for repairing natural gas well in ancient world |
| CN112431991A (en) * | 2020-11-04 | 2021-03-02 | 中国石油天然气股份有限公司 | Reinforcing, sealing and repairing method for large-section casing damage well |
| CN112360389A (en) * | 2020-11-10 | 2021-02-12 | 江苏油田矿业开发有限公司 | Small workover operation method for casing leakage plugging |
| CN112727397A (en) * | 2021-01-05 | 2021-04-30 | 西南石油大学 | Method for repairing casing damage by using temperature response type sealing agent |
| CN114086915A (en) * | 2021-11-02 | 2022-02-25 | 河北省地矿局第三水文工程地质大队 | Leakage stopping method for leakage of geothermal drilling weathering zone |
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