CN102678098A - Lamellar flooding exhausted oil well plugging and dredging combined excavation and yield increasing method - Google Patents
Lamellar flooding exhausted oil well plugging and dredging combined excavation and yield increasing method Download PDFInfo
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- CN102678098A CN102678098A CN2012101799281A CN201210179928A CN102678098A CN 102678098 A CN102678098 A CN 102678098A CN 2012101799281 A CN2012101799281 A CN 2012101799281A CN 201210179928 A CN201210179928 A CN 201210179928A CN 102678098 A CN102678098 A CN 102678098A
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- 239000003129 oil well Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000009412 basement excavation Methods 0.000 title 1
- 239000004568 cement Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 abstract description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 4
- 125000003277 amino group Chemical group 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 50
- 235000019198 oils Nutrition 0.000 description 50
- 239000010779 crude oil Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 235000020681 well water Nutrition 0.000 description 3
- 239000002349 well water Substances 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 206010003694 Atrophy Diseases 0.000 description 1
- 235000019774 Rice Bran oil Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000037444 atrophy Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011799 hole material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000008165 rice bran oil Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- Edible Oils And Fats (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A method for increasing the yield of oil wells depleted by layered flooding is applied to oil field development. The method comprises the steps of determining a low-permeability layer or a low-pressure layer with high oil saturation and low extraction degree as a potential layer by using production test data of an oil well, plugging all opened oil layers by using cement slurry of amphoteric metal powder for well cementation, drilling out redundant cement plugs in a shaft, rebuilding a new oil outlet channel between the potential layer and the shaft in a deep penetration perforation mode in the potential layer, and finally dredging and deblocking by using acid liquor consisting of 1.5-8% of hydrofluoric acid, 5-15% of hydrochloric acid, 2-5% of acetic acid and 1-2% of polyquaternary amine, wherein after production is recovered, the average single-well yield increasing oil amount reaches more than 2.7 times, the average effective rate is more than 90%, the average single-well effective period is more than 300 days, and the average ton oil yield increasing measure cost is reduced by more than 80%.
Description
Technical field
The present invention relates to the oil field development technical field, the stifled raising the output method of taping the latent power that combines of dredging of the exhausted oil well of particularly a kind of water logging.
Background technology
At present; The oil reservoir of each of oil field mouthful oil mining generally is a multilayer, and the penetrating power of oil reservoir and oil productive capacity are not equally distributed from top to bottom, can be divided into three types of high permeability zone section, middle permeable interval and hyposmosis intervals according to the difference of permeability relatively; Core intersection that can produce oil is called employs thickness; Can not fuel-displaced core intersection be called and do not employ thickness, each self-corresponding reserves is called mining-employed reserves and non-producing reserves, and extraction crude oil cumulant is a recovery percent of reserves with the ratio of reserves.
When well water greater than 95～99%, daily oil production fails to be sold at auction on time less than the industry oil of region; This type oil well has not had extraction value and has been called the exhausted oil well of water logging; The ultimate recovery of the exhausted oil well of a bite water logging generally can not surpass 45%; In other words, the exhausted oil well of a bite water logging has at least the crude oil more than 50% not exploit; According to statistics, 50～80% and 5～30% of well oil output is exploited out from high permeability zone Duan Yuzhong permeable interval respectively, and the oil pump capacity of hyposmosis interval can not surpass 10%; Even never produced one ton of crude oil; Along with the rising of well water, middle and high infiltration passes through that washing away of water stream channel becomes big in the layer, and producing pressure differential reduces; The fuel-displaced thickness atrophy gradually of the middle hyposmosis interval of original oil-yielding stratum; Make and do not employ thickness and non-producing reserves improve gradually, when well water greater than after forming the exhausted oil well of water logging more than 95～99%, have at least 50～80% recoverable reserves still to be come by extraction; The middle hyposmosis section that these non-producing reserves or recovery percent of reserves are low is the potentiality intervals, also is the main object that oil well is taped the latent power.
For in excavating, the potentiality of potentiality interval that the Middle-Low Permeability Reservoirs recovery percent of reserves is low; The general well stimulation of adopting is wellfracturing, acidifying, de-plugging and chemical water shutoff; Wherein pressure break, acidifying, de-plugging measure are the oil flow channels that makes a high infiltration of the original circulation passage change enlarging greatly or rebulid of crude oil in the oil reservoir, and the deficiency of doing like this is the formation water in the oil reservoir because ratio of viscosities crude oil is low, flowability is better, in case after the formation water in aquifer gets into the runner of pressure break, acidifying, de-plugging measure formation; Oil well will form new " water breakthrough " passage; Cause the water logging of sudden and violent property, not fuel-displaced water outlet, so the period of validity of such measure is short, weak effect; And chemical water shutoff is to block water-yielding stratum with stifled agent; Its main deficiency is that technical requirements is high; Because stifled agent character receives the multiple action in " oil, gas, water, hole, ooze, satisfy, press, warm, salt ", is not that the period of validity of shutoff is lacked, when blocking the high permeability zone water exit interval, also block middle hyposmosis interval and lost efficacy; Therefore, the weak point of prior art is: success rate is low, period of validity is short, have a big risk, cost high.
Chinese patent publication number CN1664306A provides a kind of " method of the oil field redevelopment of scrapping because of water logging "; Chinese patent publication number CN101059072A provides a kind of " utilizing the method for artificial interface dredging residue oil from thick oil layer ", belongs to the exploitation method to the not enough stratum of oil productive capacity.
Summary of the invention
The objective of the invention is: provide the exhausted oil well of a kind of stratiform water logging the stifled raising the output method of taping the latent power that combines of dredging, tap the latent power effective, period of validity long, successful interest rate is high, risk is little, cost is low.The deficiency that overcome that the prior art success rate is low, period of validity is lacked, have a big risk, cost is high.
The technical scheme that the present invention adopts is: the stifled raising the output method of taping the latent power that combines of dredging of the exhausted oil well of stratiform water logging is characterized in that:
Confirming of steps A, oil well potentiality layer: the potentiality layer of confirming this well according to test data; Oil saturation is higher than 65%, to be lower than 25% oil reservoir be the potentiality layer to recovery percent of reserves; Oil saturation wherein confirms that with C/O ratio well logging data recovery percent of reserves is confirmed with the zonal testing data.Those skilled in the art are easy to confirm the potentiality layer according to oil saturation and recovery percent of reserves.
Step B, whole oil discharge passages that oil well is penetrated out between oil reservoir and pit shaft carry out shutoff: method for blocking is the cementing slurry that squeeze note is mixed with cement and amphoteric metal powder in oil well, and cement weight percentage is 0.01～2% in the cementing slurry; The granularity of amphoteric metal powder is 50～200 orders, and the percentage by weight of amphoteric metal powder is 0.4～1.5%; All the other are water, and each weight percentages of components is absolutely.The squeeze note discharge capacity is 5～10 times of the maximum production fluid amount of oil well, and squeeze pressure should be between 0.30～1.05 times of oil reservoir fracture pressure, and blocking radius is 0.5～20 meter, and the best is 1.0～3.0 meters, and closing well was waited and coagulated 4～72 hours after squeeze note finished.The cementing slurry of amphoteric metal powder comes all oil reservoir oil discharge passages of having opened of shutoff,
Step C, brill remove cement plug unnecessary in the pit shaft; Cleaning pit shaft: with tubing string test cement plug height; When the height of cement plug is lower than under the potentiality layer 5 meters at interface, need not bore plug, when the cement plug height is higher than under the potentiality layer 5 meters at interface cement plug is drilled under the potentiality layer 5 meters at interface.
Step D, carry out the pit shaft shutoff and test envelope: adopt the suction mode that pit shaft shutoff situation is tested envelope, come out the liquid pumping in the pit shaft earlier, make liquid level reduce to well depth half the (0.5 times), it is qualified that liquid level rising in 24 hours is no more than 1m.
The reconstruction of oil discharge passage between step e, potentiality layer and pit shaft: between potentiality layer and pit shaft; Rebuild oil discharge passage with dark perforated hole mode; And confirm shot density according to the completion mode of the original oil discharge passage of oil well, the shot density of former barefoot completion is 12～20 hole/rice; The shot density of former perforation completion is 10～18 hole/rice; The shot density of former sieve tube completion is 8～16 hole/rice.
Step F, last; Utilization contain percentage by weight 1.5～8% hydrofluoric acid, 5～15% hydrochloric acid, 2～5% acetic acid, 1～2% gather quaternary amine; All the other are water, and each component percentages sum is 100%, to the potentiality layer oil discharge passage of rebuilding dredge, de-plugging; The acid solution consumption of every meter potentiality layer is 0.5～1.5 cubic metre.
Step G, be lowered to flow string, resume production.
Described amphoteric metal powder is aluminium powder and/or zinc powder.
Beneficial effect of the present invention: the stifled raising the output method of taping the latent power that combines of dredging of the exhausted oil well of stratiform water logging of the present invention; To the measure of taping the latent power of the exhausted oil well of stratiform water logging; Average individual well production gain reaches more than 2.7 times, average well water reduces by 50% or more, average effectiveness level is greater than 90%, on average the individual well period of validity is greater than 300 days; The oily well stimulation expense of average ton reduces more than 80%, so this method has the advantage that effective, successful interest rate is high, risk is little, period of validity is long, cost is low of taping the latent power.
The specific embodiment
Pound sign: peace 50-2 well
The oil well position: west of a river affair depression peace 69-90 structural belt is pacified 63 fault blocks
Oil well production brief history: this well completion on December 20th, 1986, finishing drilling well depth: 2652.16m, well-case perforating completion, interval of interest: S
3Perforated interval: 2174.65～2643.78m; Artificial bottom of a well: 2650.08m; Perforation core intersection: 74.58m; Exploit 23 substratums altogether, on December 31st, 1986 went into operation, initial stage oil pressure: 24.7MPa, casing pressure: the 27.30MPa that brings in, day produce oil: 16.5t/d, not moisture, day producing natural gas: 0.57 * 10
4m
3/ d; Produce to production fluid: 8.3t/d of average day of whole month July calendar year 2001, day produce oil :≤0.15t/d, moisture:>=99%, be judged to be the major oil reservoir water logging, in closing well on August 3 calendar year 2001.
When utilizing the oil well ordinary production; December in 1999, oil well annular space on the 17th laminated distributor under well was tested the achievement and the C/O well-log information on July 18th, 2000; Comparative analysis is thought: the recovery percent of reserves of 17 substratums that this aboveground aggregate thickness of penetrating out is 49.60m is all less than 5%, and oil saturation is all greater than 86%.This well has big section potentiality layer, and the ability of taping the latent power is stronger.21 cubic metres of the maximum production fluid amounts of oil well.
August 3 calendar year 2001 between 24 days Augusts in 2009, this well is carried out fracturing 2 times, choosing layer dividing potential drop 1 time, large-scale micella acid acidifying once, chemical water shutoff 1 is inferior to amount to large-scale measure 5 times, accumulative total increases 1753 tons of oil, effect is relatively poor.
On August 24th, 2009 this well is carried out the well stimulation of taping the latent power of the exhausted oil well of water logging, concrete grammar and step are:
1., the confirming of this oil well potentiality layer: this well satisfy oil saturation greater than 65%, recovery percent of reserves is the potentiality layer less than 25% less permeable layer or low pressure layer, to the measure of taping the latent power of potentiality layer.Oil saturation wherein confirms that with C/O ratio well logging data recovery percent of reserves is confirmed with the zonal testing data.According to this standard, this aboveground gross thickness of penetrating out recovery percent of reserves that is 49.60m all less than 5%, oil saturation all confirms as the potentiality layer greater than 17 oil reservoirs of 86%.
2., whole oil discharge passages of oil well being penetrated out between oil reservoir and pit shaft carry out shutoff:
Method for blocking is the cementing slurry that squeeze note is mixed with cement and amphoteric metal powder in oil well, and cement weight percentage is 0.1% in the cementing slurry; The granularity of amphoteric metal powder is 100 orders, and the percentage by weight of amphoteric metal powder is 0.6%; Water is 92.5%.The amphoteric metal powder is aluminium powder and zinc powder, and the weight ratio of aluminium powder and zinc powder is 1:1; The cementing slurry that is mixed with cement and amphoteric metal powder is 168 sides, and the squeeze note discharge capacity is 8 times of the maximum production fluid amounts of oil well, and squeeze pressure should be 0.75 times of oil reservoir fracture pressure, and the maximum pump discharge of squeeze note is 5.6m
3/ h, the squeeze pressure scope is 20～46MPa.Blocking radius is 1.6 meters.Squeeze note finishes instead to circulate and replaces out unnecessary cementing slurry, upper lifting pipe post, closing well Hou Ning 24 hours.
3., bore and to remove cement plug unnecessary in the pit shaft, the cleaning pit shaft, test envelope then:
With the tubing string test cement plug height of band nib, the height of cement plug is lower than next 5 meters in the face (4.5 meters) of potentiality layer.
4. envelope is tested in the pit shaft shutoff: adopt the suction mode to test envelope, the liquid in the suction pit shaft makes liquid level reduce to half the (0.5 times) of well depth, and liquid level rose 0.9 meter in 24 hours, and shutoff is qualified.
5., the reconstruction of oil discharge passage between potentiality layer and pit shaft: between potentiality layer and pit shaft; Rebuild oil discharge passage with dark perforated hole mode; And confirm shot density according to the completion mode of the original oil discharge passage of oil well, the shot density of corresponding potentiality layer is 10 hole/rice respectively.Considering the reality that the oil well time limit is long, casing strength is lower, is 10 hole/rice in the density of the dark perforated hole that carries out selecting for use when oil discharge passage is rebuild between potentiality layer and pit shaft.
6., this well selected to gather quaternary amine with containing percentage by weight 3% hydrofluoric acid, 12% hydrochloric acid, 4% acetic acid and 1.5%, all the other are the acid solution mediation oil discharge passage of water, each weight percentages of components be a hundred per cent.Remove the oil layer pollution in the construction of potentiality layer, the consumption of acid solution is every rice bran oil layer 1.25 side.
7., be lowered to flow string, resume production.
After construction finishes, be lowered to the oil pumping of diameter 56mm oil well pump and go into operation degree of depth 1796.15m; Day at initial stage production fluid: 72t/d, day produce oil: 67t/d, moisture: 7%; This measure is still effective by the end of on December 20th, 2011,13607 tons of accumulative total incremental oil productions, nearly 0.5 hundred million yuan of create beneficial result.This construction total expense is 670,000 yuan, has only 80% of 830,000 yuan of pressure break expenses, 10% of the not enough pressure break of the oily measure cost of ton, and cost is low, profitable, period of validity is long.
Claims (2)
1. the raising the output method of taping the latent power of the exhausted oil well of a stratiform water logging is characterized in that:
Confirming of steps A, oil well potentiality layer: the potentiality layer of confirming this well according to test data; Oil saturation is higher than 65%, to be lower than 25% oil reservoir be the potentiality layer to recovery percent of reserves; Oil saturation wherein confirms that with C/O ratio well logging data recovery percent of reserves is confirmed with the zonal testing data.
Step B, whole oil discharge passages that oil well is penetrated out between oil reservoir and pit shaft carry out shutoff: method for blocking is the cementing slurry that squeeze note is mixed with cement and amphoteric metal powder in oil well, and cement weight percentage is 0.01～2% in the cementing slurry; The granularity of amphoteric metal powder is 50～200 orders, and the percentage by weight of amphoteric metal powder is 0.4～1.5%; All the other are water, and each weight percentages of components sum is 100%.The squeeze note discharge capacity is 5～10 times of the maximum production fluid amount of oil well, and squeeze pressure should be between 0.30～1.05 times of oil reservoir fracture pressure, and blocking radius is 0.5～20 meter, and the best is 1.0～3.0 meters, and closing well was waited and coagulated 4～72 hours after squeeze note finished.The cementing slurry of amphoteric metal powder comes all oil reservoir oil discharge passages of having opened of shutoff,
When squeeze pressure during less than 0.30 times of oil reservoir fracture pressure; Explaining that the washing space is excessive is difficult for shutoff; " squeeze note-Hou Ning " several times; Each squeeze note amount is 15～25% of the design total amount, returns to 0.30 times of oil reservoir fracture pressure until squeeze pressure and injects remaining cementing slurry continuously with the top.
Step C, brill remove cement plug unnecessary in the pit shaft; Cleaning pit shaft: with tubing string test cement plug height; When the height of cement plug is lower than 5 meters in the next face of potentiality layer, need not bore plug, when the cement plug height is higher than 5 meters in the next face of potentiality layer cement plug is drilled into 5 meters in the next face of potentiality layer.
Step D, carry out the pit shaft shutoff and test envelope: adopt the suction mode that pit shaft shutoff situation is tested envelope, the liquid in the pumping pit shaft makes liquid level reduce to the half the of well depth, and 24 hours liquid levels rise, and to be no more than 1m be qualified.
The reconstruction of oil discharge passage between step e, potentiality layer and pit shaft: between potentiality layer and pit shaft; Rebuild oil discharge passage with dark perforated hole mode; And confirm shot density according to the completion mode of the original oil discharge passage of oil well, the shot density of former barefoot completion is 12～20 hole/rice; The shot density of former perforation completion is 10～18 hole/rice; The shot density of former sieve tube completion is 8～16 hole/rice.
Step F, last, utilize the hydrofluoric acid that contains percentage by weight 1.5～8%, 5～15% hydrochloric acid, 2～5% acetic acid, 1～2% gather quaternary amine, all the other be the acid solution of water, each weight percentages of components is a hundred per cent.Potentiality layer oil discharge passage to rebuilding dredged, de-plugging; The acid solution consumption of every meter potentiality layer is 0.5～1.5 side.
Step G, be lowered to flow string, resume production.
2. the raising the output method of taping the latent power of the exhausted oil well of stratiform water logging according to claim 1, it is characterized in that: described amphoteric metal powder is aluminium powder and/or zinc powder.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103967466A (en) * | 2013-01-27 | 2014-08-06 | 陕西慷麟石油技术开发有限公司 | PGZ oil field abandoned well exploitation recovery and production increasing novel technique |
| CN104449609A (en) * | 2014-10-31 | 2015-03-25 | 河南理工大学 | Active pressure maintaining and hole sealing material for gas extraction drill hole and hole sealing process thereof |
| CN109184656A (en) * | 2018-09-05 | 2019-01-11 | 大庆油田有限责任公司 | One kind, which adopting no note type and isolates well point, taps the latent power and proposes efficacious prescriptions method |
| CN109736706A (en) * | 2018-11-28 | 2019-05-10 | 中国石油天然气股份有限公司 | Bottom water reservoir residual oil submergence method |
| CN110552656A (en) * | 2019-08-19 | 2019-12-10 | 中国石油天然气股份有限公司 | Method for fixed-point crack initiation of low-permeability layer of water flooded well |
| CN110965965A (en) * | 2019-12-18 | 2020-04-07 | 山西蓝焰煤层气集团有限责任公司 | Method for developing underlying coal reservoir by utilizing coalbed methane depletion well |
| CN114575782A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气集团有限公司 | Ash squeezing well repairing pipe column and ash squeezing well repairing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110552656A (en) * | 2019-08-19 | 2019-12-10 | 中国石油天然气股份有限公司 | Method for fixed-point crack initiation of low-permeability layer of water flooded well |
| CN110965965A (en) * | 2019-12-18 | 2020-04-07 | 山西蓝焰煤层气集团有限责任公司 | Method for developing underlying coal reservoir by utilizing coalbed methane depletion well |
| CN114575782A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气集团有限公司 | Ash squeezing well repairing pipe column and ash squeezing well repairing method |
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