CN103775023A - Well killing construction method for low-pressure oil and gas well - Google Patents
Well killing construction method for low-pressure oil and gas well Download PDFInfo
- Publication number
- CN103775023A CN103775023A CN201310035271.6A CN201310035271A CN103775023A CN 103775023 A CN103775023 A CN 103775023A CN 201310035271 A CN201310035271 A CN 201310035271A CN 103775023 A CN103775023 A CN 103775023A
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- Prior art keywords
- well
- oil
- gas
- kill
- job
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010276 construction Methods 0.000 title description 3
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 56
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims abstract description 29
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000003292 glue Substances 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 10
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000009286 beneficial effect Effects 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 5
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000002283 diesel fuel Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002343 natural gas well Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Pipeline Systems (AREA)
Abstract
A well killing method for a low-pressure oil-gas well comprises the steps of firstly, preparing alkaline guanidine glue solution with proper concentration and oil-soluble temporary plugging agent according to well conditions (well bore volume, gas production rate and the like); mixing the oil-soluble temporary plugging agent and the guanidine gum solution, and then fully and uniformly stirring to suspend the temporary plugging agent in the guanidine gum solution; sending the mixture formed by the oil-soluble temporary plugging agent and the guanidine gum solution into the stratum by adopting a matched process and ground pipelines and equipment; the method can be realized by adopting a matched tubular column process: the guanidine gum solution carries the temporary plugging agent to plug and shield the stratum, thereby avoiding the loss of the well killing fluid injected into the shaft, meanwhile, the alkaline guanidine gum solution filled in the shaft has better air tightness and better safety to acid gas (hydrogen sulfide, carbon dioxide and the like), preventing the stratum gas from entering the shaft, ensuring the success of well killing and being beneficial to the subsequent well repairing operation. The invention has the beneficial effects that: the near-wellbore area near the blast hole is effectively blocked, the loss of the well killing fluid is prevented from entering the stratum, and the stratum gas is prevented from entering the shaft, so that the well repairing operation is ensured to be carried out smoothly.
Description
Technical field
The present invention relates to the kill-job practice in oil well repairing operation, say more specifically and be applicable to a kind of low-pressure gas well kill-job practice that reservoir pressure coefficient is low, gas production is high.
Background technology
The fireflood production technique of Oilfield using is to utilize to inject air and burn and produced heat and steam and flue gas flooding and be used for the method for oil recovery by oil reservoir.The flue gas producing from fireflood producing well, main component is nitrogen, carbon dioxide, also has the toxic and harmfuls such as hydrogen sulfide, some producing well is large-minded, and (maximum daily output tolerance can reach 5000m
3above), reservoir pressure coefficient low (being conventionally less than 1) simultaneously,, when conventional Well Killing operation, easily there is leakage in kill job difficulty, gas cut speed is very fast, in pit shaft, be difficult for the well workover fluid column of keeping certain height, thereby cause kill-job to lose efficacy, cannot carry out follow-up workover treatment.
At present, be mainly natural gas well workover treatment for gas well, well killing fluid mainly contains: the special well killing fluid of irreducible water well killing fluid and the natural gas well, these well killing fluids are applicable to high-pressure gas well, cost is higher, be directly used in low pressure oil gas well and well killing fluid leakage easily occur and kill-job failure, and workover treatment cost is also higher.
Summary of the invention
The object of the invention is: a kind of low pressure oil gas well kill-job practice is provided, solves oil field stratum pressure coefficient is low, gas production is high oil (gas) well in well workover process, adopt the conventional Well Killing practice easily leakage to occur and cannot implement the problem of effective kill-job.This practice is also applicable to oil field and has stratum deficit, oil (gas) well of gas output per well sour gas such as sulfide hydrogen and carbon dioxide during compared with Datong District.
The technical solution used in the present invention is: low for producing well reservoir pressure coefficient, the hole condition that gas production is larger, guanidine glue carries diverting agent by near the shutoff borehole of stratum, avoid the leakage of injecting well killing fluid in pit shaft to keep certain fluid column, guanidine glue has better gas tightness and stops formation gas to enter pit shaft, containing a certain amount of alkali can absorb certain sour gas (hydrogen sulfide and carbon dioxide etc.) and have better safety simultaneously, assurance kill-job success, after workover treatment finishes, over a period to come diverting agent dissolved and remove to zonal isolation, recovering oil (gas) well produces.
The invention provides a kind of low pressure oil gas well kill-job practice, effectively reservoir plugging, stops well killing fluid leakage to enter stratum and formation gas enters pit shaft, guarantees carrying out smoothly of workover treatment.After well workover completes, can remove again over a period to come the shutoff to oil reservoir, recover oil (gas) well and normally produce.This well killing fluid cost is lower, few to oil layer pollution, injures littlely, and technique is simple.The kill-job practice provided by the invention is applicable to fireflood producing well, is applicable to low pressure natural gas well and the high oil ratio oil of low pressure etc. simultaneously.
A kind of low pressure oil gas well kill-job practice, step mainly comprises:
Kill-job practice step comprises:
First according to hole condition, the guanidine glue and the oil-soluble temporary plugging agent that contain NaOH of the preparation suitable concentrations such as hole volume, gas production and quantity;
After oil-soluble temporary plugging agent is mixed with guanidine glue, stir, diverting agent is suspended in guanidine glue;
Adopt supporting technique and surface line, equipment that the mixture of oil-soluble temporary plugging agent and the formation of guanidine glue is sent into shaft bottom perforated interval;
Adopt supporting tubing string technique to realize: guanidine glue carries diverting agent by near the shutoff borehole of stratum, avoid injecting the leakage of well killing fluid in pit shaft; In pit shaft, be full of alkaline guanidine glue, stop formation gas to enter pit shaft, guarantee kill-job success, be beneficial to follow-up workover treatment.
After workover treatment finishes, diverting agent dissolves and can remove voluntarily zonal isolation over a period to come, recovers oil (gas) well and produces.
Adopt supporting tubing string technique to realize: guanidine glue carries diverting agent by near the shutoff borehole of stratum, avoid injecting the leakage of well killing fluid in pit shaft; In pit shaft, be full of alkaline guanidine glue, stop formation gas to enter pit shaft, guarantee kill-job success, be beneficial to follow-up workover treatment.
After workover treatment finishes, diverting agent dissolves and can remove voluntarily zonal isolation over a period to come, recovers oil (gas) well and produces.
Beneficial effect of the present invention: effectively reservoir plugging, the leakage of prevention well killing fluid enters stratum and formation gas enters pit shaft, assurance workover treatment is carried out smoothly, and this well killing fluid is compared with other gas well well killing fluids, have cost compared with low, few to oil layer pollution, injure little, the feature such as shutoff is reliable and technique is simple.
The specific embodiment
Embodiment 1:
A bite fireflood producing well uses low pressure oil (gas) well well killing method
(1), this well hole condition
This well is the producing well that fireflood trial zone is newly beaten, and 550 meters of well depths, 7 inch sleeve pipes and 27/8 inch oil pipe, because of casing flange and the leakage of casing head place tubing hanger thorn, need to change casing flange and sleeve pipe both sides valve.
Before well workover, the data such as near the gas component of Site Detection well head and concentration, result is as follows:
CO:1128ppm H
2s:0ppm fuel gas: 100ppm
Casing pressure: 0.4MPa oil pressure: 0.2MPa gas production: 900m
3/ d
(2), well workover performance
Well killing fluid is with containing 0.02% NaOH and the about 30m of 0.6% guanidine glue
3, the about 8Kg of oil-soluble temporary plugging agent.
Kill-job mode: the anti-kill-job that circulates, fill with liquid from oil, cover annular space, oil pipe returns row.
Construction sequence:
1) 8Kg diverting agent has been beaten to remaining 24m from oil, cover annular space sending into perforated interval oil reservoir position with guanidine glue
3guanidine glue.Squeeze in diverting agent process, open oil pipe gate, observe outlet and return liquid situation.
2) after closing well balance, observe 24 hours.
3) observe oil pressure, casing pressure: if oil, casing pressure are all zero, do not have gas to overflow, kill-job success;
4) completion after the casing flange of replacing well head, oil pipe gate.
Kill job effect:
In 3 days that enforcement kill-job completes to workover treatment, well head pressure is zero always, does not have gas effusion, well head not to detect CO, H
2the gas components such as S, workover treatment completes smoothly.After workover treatment, this well has arranged oil pumping to produce, and has successively gas output from well head, illustrate that oil-soluble is temporarily stifled to be untied gradually, produces progressively normally, and produce oil (gas) is measured the level all returning to before workover treatment.
Embodiment 2:
A bite fireflood production test well uses low pressure oil (gas) well well killing method
(1), this well hole condition
This well is to produce through steam injection the old well that turns fireflood, 570 meters of well depths, 7 inch sleeve pipes, for trial zone production test two-tube (being 23/8 inch oil pipe) well, supervisor is lowered to tubing pump oil pumping, and looped pipeline is lowered to test cable for monitoring the data information such as downhole temperature, pressure.Because tester breaks down, need to examine pump and change test cable operation this well.Before workover treatment, record this well well head data: surface casing pressure: 3.8MPa; CO:933ppm; H
2s:66ppm, gas production 3500m
3/ d
(2), kill-job performance
Well killing fluid: containing 0.05% NaOH and the about 30m of 0.6% guanidine glue
3, the about 40Kg(of oil-soluble temporary plugging agent is respectively particle diameter φ 2.5mm～φ 3mm8Kg, φ 3.5mm～φ 5.5mm8Kg, φ 3.5mm～φ 5.5mm8Kg, φ 3.5mm～φ 5.5mm8Kg, φ 6mm～φ 10mm8Kg).
Kill-job mode: the anti-kill-job that circulates, fill with liquid from oil, cover annular space, the supervisor row of returning.
Construction sequence:
1) 40Kg diverting agent is sent into perforated interval oil reservoir position with guanidine glue from oil, cover annular space.Open supervisor's gate and observe, from the built vertical fluid column circulation of supervisor returning fluid explanation.
2) inject 30m from oil, cover annular space
3guanidine glue, circulates one week, returns out from major and minor pipe.
3) after closing well balance, observe 24 hours.
4) observe oil pressure, casing pressure: if oil, casing pressure are all zero, do not have gas to overflow, kill-job success, carries out lower step operation.
Kill job effect:
From kill-job starts, in 5 days, well head pressure is zero always, does not detect CO, H
2the gas components such as S, workover treatment completes smoothly.Within the 6th day, monitoring well head has gas to overflow, and the now dissolved inefficacy of oil-soluble temporary plugging agent is described, this well opening well and making production again, and produce oil (gas) amount all returns to the level before workover treatment.
It is 5 days that this kill-job guanidine glue adds effective reservoir plugging time of diverting agent, reaches desired design index.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (5)
1. a low pressure oil gas well kill-job practice, is characterized in that: kill-job practice step comprises:
First according to hole condition, the guanidine glue and the oil-soluble temporary plugging agent that contain NaOH of the preparation suitable concentrations such as hole volume, gas production and quantity;
After oil-soluble temporary plugging agent is mixed with guanidine glue, stir, diverting agent is suspended in guanidine glue;
Adopt supporting technique and surface line, equipment that the mixture of oil-soluble temporary plugging agent and the formation of guanidine glue is sent into shaft bottom perforated interval;
Adopt supporting tubing string technique to realize: guanidine glue carries diverting agent by near the shutoff borehole of stratum, avoid injecting the leakage of well killing fluid in pit shaft; In pit shaft, be full of alkaline guanidine glue, there is better gas tightness, stop formation gas to enter pit shaft, sour gas (hydrogen sulfide and carbon dioxide etc.) is had to better safety simultaneously, guarantee kill-job success, be beneficial to follow-up workover treatment;
After workover treatment finishes, can remove zonal isolation over a period to come, recover oil (gas) well and produce.
2. a kind of low-pressure gas well kill-job practice according to claim 1, is characterized in that the concentration of described alkaline guanidine glue is: naoh concentration 0.02-0.05%, and between guanidine glue 0.3% to 0.6%.
3. a kind of low-pressure gas well kill-job practice according to claim 1, is characterized in that described diverting agent is oil-soluble, under normal temperature, is 83.4% left and right to the solubility of diesel oil.
4. a kind of low-pressure gas well kill-job practice according to claim 1, is characterized in that described process matched therewith and surface line, equipment are that employing ground oil conduit pours into, pump truck is suppressed and sent into pit shaft technique.
5. a kind of low-pressure gas well kill-job practice according to claim 1, is characterized in that described kill-job way can, after workover treatment finishes, remove zonal isolation over a period to come, recovers oil (gas) well and produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310035271.6A CN103775023B (en) | 2013-01-30 | 2013-01-30 | Well killing construction method for low-pressure oil and gas well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310035271.6A CN103775023B (en) | 2013-01-30 | 2013-01-30 | Well killing construction method for low-pressure oil and gas well |
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| Publication Number | Publication Date |
|---|---|
| CN103775023A true CN103775023A (en) | 2014-05-07 |
| CN103775023B CN103775023B (en) | 2016-05-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041261A (en) * | 2015-05-30 | 2015-11-11 | 西南石油大学 | Well-killing workover method used with water plugging |
| CN105062443A (en) * | 2015-07-24 | 2015-11-18 | 中国石油天然气股份有限公司 | Oil-soluble temporary plugging agent and preparation method thereof |
| CN105062443B (en) * | 2015-07-24 | 2018-06-01 | 中国石油天然气股份有限公司 | Oil-soluble temporary plugging agent and preparation method thereof |
| CN109098683A (en) * | 2018-08-13 | 2018-12-28 | 西南石油大学 | A kind of well killing method for eliminating gravity displacement for horizontal well |
| CN109630047A (en) * | 2018-12-07 | 2019-04-16 | 中国石油大学(华东) | Five steps for no safe pressure window fractured reservoir kill-job push back method and equipment |
| CN112983374A (en) * | 2021-02-05 | 2021-06-18 | 中国石油天然气股份有限公司 | Liquid bridge plug under-pressure operation method |
| CN116696279A (en) * | 2023-08-07 | 2023-09-05 | 新疆斐德莱布能源科技有限公司 | Temporary blocking operation method of long straight well section gas storage |
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2013
- 2013-01-30 CN CN201310035271.6A patent/CN103775023B/en active Active
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| GB1421419A (en) * | 1972-08-18 | 1976-01-21 | Exxon Production Research Co | Fracturing method using acid external emulsions |
| US6484821B1 (en) * | 2000-11-10 | 2002-11-26 | M-I L.L.C. | Shale hydration inhibition agent and method of use |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041261A (en) * | 2015-05-30 | 2015-11-11 | 西南石油大学 | Well-killing workover method used with water plugging |
| CN105062443A (en) * | 2015-07-24 | 2015-11-18 | 中国石油天然气股份有限公司 | Oil-soluble temporary plugging agent and preparation method thereof |
| CN105062443B (en) * | 2015-07-24 | 2018-06-01 | 中国石油天然气股份有限公司 | Oil-soluble temporary plugging agent and preparation method thereof |
| CN109098683A (en) * | 2018-08-13 | 2018-12-28 | 西南石油大学 | A kind of well killing method for eliminating gravity displacement for horizontal well |
| CN109630047A (en) * | 2018-12-07 | 2019-04-16 | 中国石油大学(华东) | Five steps for no safe pressure window fractured reservoir kill-job push back method and equipment |
| CN112983374A (en) * | 2021-02-05 | 2021-06-18 | 中国石油天然气股份有限公司 | Liquid bridge plug under-pressure operation method |
| CN116696279A (en) * | 2023-08-07 | 2023-09-05 | 新疆斐德莱布能源科技有限公司 | Temporary blocking operation method of long straight well section gas storage |
| CN116696279B (en) * | 2023-08-07 | 2024-01-26 | 新疆斐德莱布能源科技有限公司 | Temporary blocking operation method of long straight well section gas storage |
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|---|---|
| CN103775023B (en) | 2016-05-11 |
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