CN102925124A - Temporary plugging composition of oil layer and application method - Google Patents
Temporary plugging composition of oil layer and application method Download PDFInfo
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- CN102925124A CN102925124A CN2012103878733A CN201210387873A CN102925124A CN 102925124 A CN102925124 A CN 102925124A CN 2012103878733 A CN2012103878733 A CN 2012103878733A CN 201210387873 A CN201210387873 A CN 201210387873A CN 102925124 A CN102925124 A CN 102925124A
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Abstract
The invention discloses a temporary plugging composition of an oil layer and an application method of the temporary plugging composition. The temporary plugging composition comprises 2-20 parts by weight of cleaning diverter XT-25A and 10-20 parts by weight of sodium salicylate and also further comprises 2-10 parts by weight of acetic acid, 1-10 parts by weight of ammonium chloride and 80-97 parts by weight of water. According to the temporary plugging composition of the oil layer, disclosed by the invention, after being injected into a stratum, a temporary plugging solution made of the cleaning diverter XT-25A and the sodium salicylate preferentially enters high-permeability pores; after the temporary plugging solution is converged with stratum water, the viscosity of the temporary plugging solution is instantly increased, so that the purpose of limiting and preventing subsequent liquid from permeating and flowing along a water flow channel with a large hole channel is achieved; in the event of encountering an ultra-large hole channel or a cracked stratum, based on injection of the temporary plugging solution, acetic acid, ammonium chloride and water are made into cross-linked fluid and injected into the stratum; the cross-link fluid and the temporary plugging solution are converged to carry out cross-linking reaction, so that high-intensity gel is formed; large-hole, high-permeability or cracked stratums can be thoroughly plugged; filtration of transformed liquid is avoided; and the formed high-intensity gel can be automatically broken within a short time in the event of being encountered with hydrocarbon or ethylene glycol monobutyl ether.
Description
Technical field
The present invention relates to temporarily stifled composition of a kind of oil reservoir, belong to technical field of petroleum extraction.
Background technology
The oil field enters ultra-high water-containing after development stage, the water logging of major reservoir big area, and the surplus oil on stratum mainly is distributed in the interior middle hyposmosis interval of thick oil pay.Because middle low permeability layer sector hole larynx is tiny, Compacted rock, natural production capacity are extremely low.For improving oil well productivity, need to carry out to reservoir the oil formation improvement measures such as acidifying.
Acid solution is followed the resistance minimum principle in the conventional acidizing treatment, preferentially enter selectively High porosity high permeability reservoirs, low permeability layer is then because advancing acid seldom, even do not advance acid and can not get due processing, like this, often occur reservoir production fluid amount after the measure and significantly raise, and the phenomenon that oil offtake significantly descends.Therefore, to being in the ultra-high water-containing oil reservoir of development stage, adopt conventional acidifying modification measures, because acid solution can not effectively enter the expection objective interval, not only can not Effective Raise and improve in the low permeability layer percolation ability, further strengthen on the contrary the interlayer permeability contrast, caused acidizing treatment poor efficiency or invalid.
Summary of the invention
The purpose of this invention is to provide temporarily stifled composition of a kind of oil reservoir.
In order to realize above purpose, the technical solution adopted in the present invention is: a kind of oil reservoir is stifled composition temporarily, comprises the cleaning diversion agent XT-25A of 2-20 weight part and the sodium salicylate of 10-20 weight part.
Described oil reservoir temporarily stifled composition also comprises the acetic acid of 2～10 weight parts, the ammonium chloride of 1～10 weight part and 80～97 parts water.
The total amount of described acetic acid, ammonium chloride and water is 100 parts.
Oil reservoir of the present invention is stifled composition temporarily, adopt cleaning diversion agent XT-25A and the sodium salicylate of formula rate to form, during use both mixing solutionss being made temporarily stifled liquid is injected in the stratum, meeting rear viscosity with water rises immediately, viscosity can rise to 20～200mpa.s, play and stop and limit liquid subsequently and continue water stream channel seepage flow along macropore, reach the purpose that changes the direction that liquid flows to.The oil formation improvement fluids such as acid solution that add subsequently, obstruction is removed in the oil impregnate duct that just can flow into obstruction, recovers and raising oil well output or water injection well water injection rate.Concrete application method comprises the steps:
1) get 2～20 parts of cleaning diversion agent XT-25A, the sodium salicylate that adds 10～20 parts stirs until all dissolvings make temporarily stifled liquid;
2) in pit shaft, clamp-on first cleaning diversion agent XT-25A as spacer pad, will block up temporarily liquid again and be squeezed in the pit shaft, then clamp-on cleaning diversion agent XT-25A as spacer pad, add at last water and replace to zone of interest, the closing well reaction;
3) can carry out follow-up construction after the reaction.
Step 2) described closing well reaction times is 30～60min.
When running into general rate of permeation stratum, only need to add water plugging liquid and can realize blocking up temporarily, acetic acid, ammonium chloride and water can not add.If meet extra big channel or fissured formation, can be on the basis of adopting cleaning diversion agent XT-25A and sodium salicylate, adopt again the acetic acid of formula ratio, ammonium chloride and water are made crosslinked fluid, crosslinked fluid runs into temporarily stifled liquid that cleaning diversion agent XT-25A and sodium salicylate make and crosslinking reaction then occurs forms high-strength gel, viscosity can rise to 1000～2000mpa.s, thoroughly shutoff Gao Konggao oozes or fissured formation, prevent from transforming the leak-off of liquid, stop transformation liquid to enter high permeability formation, force follow-up liquid rotating to entering low permeability formation, the realization reservoir is evenly transformed, and improves the heterogeneous reservoir correctional effect.After construction finishes, the high-viscosity material or the gel that generate run into the hydrocarbon liquids that refluxes on the stratum and then automatically break glue, perhaps clamp-on an amount of ethylene glycol monobutyl ether and promote broken glue effect to the active layer position, liquid viscosity is approaching with water viscosity behind the broken glue, to the stratum without any injury.
Embodiment
The raw material that relates among the embodiment 1～10 for example cleans diversion agent XT-25A, sodium salicylate, and acetic acid, ammonium chloride is the commercially available prod, and wherein cleaning diversion agent XT-25A is the industrial goods that the profound safe Industrial Co., Ltd. in Xinxiang City sells.
Embodiment 1
The oil reservoir of present embodiment is stifled composition temporarily, comprises 67 weight parts cleaning diversion agent XT-25A, 33 weight parts water poplar acid sodiums.
Embodiment 2
The oil reservoir of present embodiment is stifled composition temporarily, comprises 67 weight parts cleaning diversion agent XT-25A, 33 weight parts water poplar acid sodiums, the acetic acid of 2 weight parts, the ammonium chloride of 1 weight part and 97 parts of water.
Embodiment 3
The oil reservoir of present embodiment is stifled composition temporarily, comprises 50 weight parts cleaning diversion agent XT-25A, 50 weight parts water poplar acid sodiums.
Embodiment 4
The oil reservoir of present embodiment is stifled composition temporarily, comprises 50 weight parts cleaning diversion agent XT-25A, 50 weight parts water poplar acid sodiums, the acetic acid of 7 weight parts, the water of the ammonium chloride of 4 weight parts and 89 parts.
Embodiment 5
The oil reservoir of present embodiment is stifled composition temporarily, comprises 43 weight parts cleaning diversion agent XT-25A, 57 weight parts water poplar acid sodiums.
Embodiment 6
The oil reservoir of present embodiment is stifled composition temporarily, comprises 43 weight parts cleaning diversion agent XT-25A, 57 weight parts water poplar acid sodiums, the acetic acid of 8 weight parts, the water of the ammonium chloride of 7 weight parts and 85 parts.
Embodiment 7
The oil reservoir of present embodiment is stifled composition temporarily, comprises 30 weight parts cleaning diversion agent XT-25A, 70 weight parts water poplar acid sodiums.
Embodiment 8
The oil reservoir of present embodiment is stifled composition temporarily, comprises 30 weight parts cleaning diversion agent XT-25A, 70 weight parts water poplar acid sodiums, the acetic acid of 10 weight parts, the water of the ammonium chloride of 10 weight parts and 80 parts.
Embodiment 9
Present embodiment is the temporarily application method of stifled composition of oil reservoir, may further comprise the steps:
1) get the cleaning diversion agent XT-25A(liquid of formula ratio), the sodium salicylate that adds formula ratio stirs until all dissolvings make temporarily stifled liquid;
2) in pit shaft, clamp-on first 0.3m
3Cleaning diversion agent XT-25A will block up temporarily liquid again and be squeezed in the pit shaft as spacer pad, then clamp-on 0.3m
3Cleaning diversion agent XT-25A is as spacer pad, and last water will block up temporarily liquid and replace zone of interest, closing well reaction 30min;
3) can carry out follow-up construction after the reaction.
Present embodiment can practice for general rate of permeation stratum, and the consumption of concrete component can such as embodiment 1,3,5,7, not repeat them here.
Embodiment 10
Present embodiment is the temporarily application method of stifled composition of oil reservoir, may further comprise the steps:
1) get the cleaning diversion agent XT-25A(liquid of formula ratio), the sodium salicylate that adds formula ratio stirs until all dissolvings make temporarily stifled liquid; Get acetic acid, ammonium chloride and the water mix and blend of formula ratio until all dissolvings make crosslinked fluid;
2) in pit shaft, clamp-on first 0.3m
3Cleaning diversion agent XT-25A will block up temporarily liquid again and be squeezed in the pit shaft as spacer pad, then clamp-on 0.3m
3Diversion agent XT-25A is as spacer pad for cleaning, prevents from blocking up temporarily liquid and the crosslinked fluid formation high-strength gel that meets in pit shaft, clamp-ons subsequently crosslinked fluid, and last water will block up temporarily liquid and crosslinked fluid and replace zone of interest, and closing well reacts 60min;
3) can carry out follow-up construction after the reaction.
Present embodiment can practice for extra big channel or fissured formation, and the consumption of concrete component can such as embodiment 2,4,6,8, not repeat them here.
Experimental example
The below is temporary plugging agent Lab-evaluation experiment of the present invention:
1, adopt capillary viscosimeter for embodiment 1～8 and 9,10 test in conjunction with the embodiments, the theing contents are as follows of test:
The initial viscosity (initial viscosity) of the temporarily stifled liquid of making after embodiment 1,3,5,7 composition are composite, then stifled liquid is met viscosity behind the local water (meet water after viscosity) temporarily; Viscosity (crosslinked rear viscosity) behind the crosslinked fluid that continues to be made by acetic acid, ammonium chloride and water among the adding embodiment 2,4,6,8; Viscosity behind the broken glue of gel (viscosity behind the broken glue).Test result sees Table 1,
Table 1 temporary plugging agent viscosity test table
2, the shunting steering test of temporary plugging agent is estimated:
Test is finished at pressure core flow tester, test method: hypotonic, the height of being connected in parallel simultaneously oozes two cores, and discharge capacity is controlled at 1ml/min all the time.Testing sequence is:
1. displacement simulation local water (2～3%NHC1
4Solution), record records the initial rate of permeation K of rock core
0
2. inject temporary plugging agent, termination of pumping reaction 30min observes core two ends pressure reduction and changes;
3. routinely acidifying program displacement acid solution, termination of pumping reaction 30min;
4. displacement simulation local water, record record final rate of permeation K1 after the rock core acidifying.
Calculate two drill core permeability rates and increase multiple proportions.
The variation of rate of permeation before and after table 2 rock core flowing experiment
Shown by table 2 test: injecting acid liquid reaction after for some time, the most permeable zone core is fully by shutoff, acid solution changes the hyposmosis core over to, four groups of core tests in parallel, the hyposmosis drill core permeability rate has all obtained improvement to a certain degree, this shows that the turning efficiency of temporary plugging agent is very obvious, illustrate that this temporary plugging agent has the characteristic of low leak-off, low injury, strong shunting.
3, water injection well test
Certain water injection well is penetrated out layer position VII 2.3, VII 15
1.15
2. VII 18, the thick 18.6m of sand.Full well divides VII 2.3/ VII 15.18 two sections water fillings, and each section injection allocation is 50/20m
3/ d.At present at pump pressure 16.4MPa, under the pressure of oil pressure 15MPa, full well suction 57m
3/ d, wherein VII 15. VII 18 do not absorb water.The last acidifying of this well is 2007.9.24-29 day acidifying VII 2.3/15.18, and the well suction is qualified entirely after the acidifying, daily water-injection rate 12 ↗ 80m
3/ d, VII 15.18 does not absorb water at present.
This well site operation, operation pressure causes 27MPa by the 18MPa rising behind the injection temporary plugging agent, carries out subsequently conventional acidizing treatment, and operation pressure is down to 22MPa by 27MPa.After the measure VII 15.18 is tested, under oil pressure 16Mpa, day notes 112m
3, after throwing 1.8mm water is chewed the control water filling, under oil pressure 15MPa, day notes 18m
3/ d, this well accumulative total augmented injection 2316m
3, still remain valid at present.This well site operation has been obtained good shunting and has been turned to acidizing effect.
Claims (7)
1. an oil reservoir blocks up composition temporarily, it is characterized in that: comprise the cleaning diversion agent XT-25A of 2-20 weight part and the sodium salicylate of 10-20 weight part.
2. oil reservoir according to claim 1 blocks up composition temporarily, it is characterized in that: also comprise the acetic acid of 2～10 weight parts, the ammonium chloride of 1～10 weight part and 80～97 parts water.
3. oil reservoir according to claim 1 blocks up composition temporarily, and it is characterized in that: the total amount of described acetic acid, ammonium chloride and water is 100 parts.
4. temporary application method of stifled composition of oil reservoir as claimed in claim 1 is characterized in that: may further comprise the steps:
1) get 2～20 parts of cleaning diversion agent XT-25A, the sodium salicylate that adds 10～20 parts stirs until all dissolvings make temporarily stifled liquid;
2) in pit shaft, clamp-on first cleaning diversion agent XT-25A as spacer pad, will block up temporarily liquid again and be squeezed in the pit shaft, then clamp-on cleaning diversion agent XT-25A as spacer pad, add at last water and replace to zone of interest, the closing well reaction;
3) can carry out follow-up construction after the reaction.
5. application method according to claim 4 is characterized in that: step 2) for the second time add spacer pad and add water and increase following steps between replacing: add the crosslinked fluid of being made by the water mixing and stirring of the ammonium chloride of the acetic acid of 2～10 weight parts, 1～10 weight part and 80～97 parts in the pit shaft.
6. application method according to claim 5, it is characterized in that: the total amount of described acetic acid, ammonium chloride and water is 100 parts.
7. each described application method is characterized in that: step 2 according to claim 4～6) the described closing well reaction times is 30～60min.
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| CN201210387873.3A CN102925124B (en) | 2012-10-12 | 2012-10-12 | A kind of oil reservoir is stifled composition and application method temporarily |
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Cited By (4)
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| CN105401929A (en) * | 2014-09-09 | 2016-03-16 | 中国石油化工股份有限公司 | Even acid distribution method for acidification of heterogeneous storage layer |
| CN106147733A (en) * | 2015-04-02 | 2016-11-23 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN106351607A (en) * | 2016-11-17 | 2017-01-25 | 烟台智本知识产权运营管理有限公司 | Water shut-off and profile control method for oil-water well |
| CN106522880A (en) * | 2016-11-17 | 2017-03-22 | 烟台智本知识产权运营管理有限公司 | Controllable temporary plugging method applied during water plugging and profile control conducted through gel plugging agent |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401929A (en) * | 2014-09-09 | 2016-03-16 | 中国石油化工股份有限公司 | Even acid distribution method for acidification of heterogeneous storage layer |
| CN106147733A (en) * | 2015-04-02 | 2016-11-23 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN106147733B (en) * | 2015-04-02 | 2019-03-12 | 中国石油天然气股份有限公司 | A kind of water blockoff composition and its preparation method and application |
| CN106351607A (en) * | 2016-11-17 | 2017-01-25 | 烟台智本知识产权运营管理有限公司 | Water shut-off and profile control method for oil-water well |
| CN106522880A (en) * | 2016-11-17 | 2017-03-22 | 烟台智本知识产权运营管理有限公司 | Controllable temporary plugging method applied during water plugging and profile control conducted through gel plugging agent |
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