CN102925124B - A kind of oil reservoir is stifled composition and application method temporarily - Google Patents
A kind of oil reservoir is stifled composition and application method temporarily Download PDFInfo
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- CN102925124B CN102925124B CN201210387873.3A CN201210387873A CN102925124B CN 102925124 B CN102925124 B CN 102925124B CN 201210387873 A CN201210387873 A CN 201210387873A CN 102925124 B CN102925124 B CN 102925124B
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Abstract
The invention discloses a kind of oil reservoir stifled composition and application method thereof temporarily, this blocks up composition temporarily and comprises the clean diversion agent XT-25A of 2-20 weight part and the sodium salicylate of 10-20 weight part.The acetic acid of 2 ~ 10 weight parts, the ammonium chloride of 1 ~ 10 weight part and the water of 80 ~ 97 parts can also be comprised.Oil reservoir of the present invention is stifled composition temporarily, after the stifled temporarily liquid that wherein clean diversion agent XT-25A and sodium salicylate are made injects stratum, preferentially enter in Thief zone hole, after meeting with local water, stifled fluid viscosity rises immediately temporarily, plays and stops and limit the object of subsequent liquid along the water stream channel seepage flow of macropore.If meet extra big channel or fissured formation, on the basis injecting stifled liquid temporarily, acetic acid, ammonium chloride and water are made crosslinked fluid and inject stratum, crosslinked fluid and temporary stifled liquid phase are met and crosslinking reaction occurs are formed high-strength gel, can thoroughly ooze or fissured formation by shutoff Gao Konggao, prevent the leak-off transforming liquid, the high-strength gel of formation runs into hydro carbons or ethylene glycol monobutyl ether can break glue at short notice automatically.
Description
Technical field
The present invention relates to a kind of oil reservoir stifled composition temporarily, belong to technical field of petroleum extraction.
Background technology
After oil field enters ultra-high water-containing development stage, the water logging of major reservoir big area, the surplus oil on stratum is mainly distributed in the middle hyposmosis interval in thick oil pay.Because middle low permeability layer sector hole larynx is tiny, Compacted rock, natural production capacity is extremely low.For improving oil well productivity, need to carry out the oil formation improvement measures such as acidifying to reservoir.
In conventional acidulation construction, acid solution follows resistance minimum principle, preferentially enter High porosity high permeability reservoirs selectively, low permeability layer is then because entering acid seldom, even do not enter acid and can not get due process, like this, often occur after measure that reservoir Liquid output significantly raises, and the phenomenon that oil offtake significantly declines.Therefore, to the oil reservoir being in ultra-high water-containing development stage, adopt conventional acidifying modification measures, because acid solution can not effectively enter expection objective interval, low permeability layer percolation ability in not only can not effectively improving and improve, increase interlayer permeability contrast further on the contrary, cause acidizing treatment poor efficiency or invalid.
Summary of the invention
The object of this invention is to provide a kind of oil reservoir stifled composition temporarily.
In order to realize above object, the technical solution adopted in the present invention is: a kind of oil reservoir is stifled composition temporarily, comprises the clean 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 water of the acetic acid of 2 ~ 10 weight parts, the ammonium chloride of 1 ~ 10 weight part and 80 ~ 97 parts.
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 clean diversion agent XT-25A and the sodium salicylate composition of formula rate, during use, both mixing solutionss being made stifled liquid is temporarily injected in stratum, after meeting with aqueous phase, viscosity rises immediately, viscosity can rise to 20 ~ 200mpa.s, play and stop and limit the water stream channel seepage flow of liquid continuation subsequently along macropore, reach the object changing the direction that liquid flows to.The oil formation improvement fluids such as the acid solution added subsequently, blocking is removed in the oil impregnate duct that just can flow into blocking, recovers and improves oil well output or water injection well water injection rate.Concrete application method comprises the steps:
1) get 2 ~ 20 parts of clean diversion agent XT-25A, the sodium salicylate adding 10 ~ 20 parts stirs until all dissolve, obtained stifled liquid temporarily;
2) first clamp-on clean diversion agent XT-25A in the wellbore as spacer pad, then be squeezed in pit shaft by blocking up liquid temporarily, then clamp-on clean diversion agent XT-25A as spacer pad, finally add water and replace to zone of interest, closing well reacts;
3) subsequent construction can be carried out after reaction.
Step 2) the described closing well reaction times is 30 ~ 60min.
When running into general permeability formations, only need to add water plugging liquid and can realize stifled temporarily, acetic acid, ammonium chloride and water can not add.If meet extra big channel or fissured formation, can on the basis adopting clean diversion agent XT-25A and sodium salicylate, adopt the acetic acid of formula ratio again, ammonium chloride and water make crosslinked fluid, crosslinked fluid runs into stifled temporarily liquid that clean diversion agent XT-25A and sodium salicylate make and crosslinking reaction then occurs forms high-strength gel, viscosity can rise to 1000 ~ 2000mpa.s, can thoroughly ooze or fissured formation by shutoff Gao Konggao, prevent the leak-off transforming liquid, transformation liquid is stoped to enter high-permeability reservoir, force subsequent liquid to turn to and enter low permeability formation, realize reservoir evenly to transform, improve heterogeneous reservoir correctional effect.After construction terminates, the high-viscosity material generated or gel, the hydrocarbon liquids running into stratum backflow then breaks glue automatically, or clamp-ons appropriate ethylene glycol monobutyl ether to the broken glue effect of active layer position lifting, after broken glue liquid viscosity and water viscosity close, formation is without any injury.
Embodiment
The raw material related in embodiment 1 ~ 10, such as clean diversion agent XT-25A, sodium salicylate, acetic acid, ammonium chloride is commercially available prod, and wherein clean diversion agent XT-25A is the industrial goods that Xuan Tai Industrial Co., Ltd. of Xinxiang City sells.
Embodiment 1
The oil reservoir stifled composition temporarily of the present embodiment, comprises 67 weight parts and cleans diversion agent XT-25A, 33 weight parts water poplar acid sodiums.
Embodiment 2
The oil reservoir stifled composition temporarily of the present embodiment, comprises 67 weight parts and cleans 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 stifled composition temporarily of the present embodiment, comprises 50 weight parts and cleans diversion agent XT-25A, 50 weight parts water poplar acid sodiums.
Embodiment 4
The oil reservoir of the present embodiment is stifled composition temporarily, comprises 50 weight parts and cleans 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 stifled composition temporarily of the present embodiment, comprises 43 weight parts and cleans diversion agent XT-25A, 57 weight parts water poplar acid sodiums.
Embodiment 6
The oil reservoir of the present embodiment is stifled composition temporarily, comprises 43 weight parts and cleans 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 stifled composition temporarily of the present embodiment, comprises 30 weight parts and cleans diversion agent XT-25A, 70 weight parts water poplar acid sodiums.
Embodiment 8
The oil reservoir of the present embodiment is stifled composition temporarily, comprises 30 weight parts and cleans 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
The present embodiment is the application method that oil reservoir blocks up composition temporarily, comprises the following steps:
1) the clean diversion agent XT-25A(liquid of formula ratio is got), the sodium salicylate adding formula ratio stirs until all dissolve, obtained stifled liquid temporarily;
2) first 0.3m is clamp-oned in the wellbore
3clean diversion agent XT-25A as spacer pad, then is squeezed in pit shaft by blocking up liquid temporarily, then clamp-ons 0.3m
3clean diversion agent XT-25A, as spacer pad, finally will block up liquid temporarily with water and replace zone of interest, closing well reaction 30min;
3) subsequent construction can be carried out after reaction.
The present embodiment can practice for general permeability formations, and the consumption of concrete component as embodiment 1,3,5,7, can not repeat them here.
Embodiment 10
The present embodiment is the application method that oil reservoir blocks up composition temporarily, comprises the following steps:
1) the clean diversion agent XT-25A(liquid of formula ratio is got), the sodium salicylate adding formula ratio stirs until all dissolve, obtained stifled liquid temporarily; Get the acetic acid of formula ratio, ammonium chloride and water mix and blend until all dissolve, obtained crosslinked fluid;
2) first 0.3m is clamp-oned in the wellbore
3clean diversion agent XT-25A as spacer pad, then is squeezed in pit shaft by blocking up liquid temporarily, then clamp-ons 0.3m
3clean diversion agent XT-25A, as spacer pad, prevents from blocking up temporarily liquid and crosslinked fluid and to meet in the wellbore formation high-strength gel, clamp-on crosslinked fluid subsequently, finally will block up liquid temporarily with water and crosslinked fluid replaces zone of interest, and closing well reacts 60min;
3) subsequent construction can be carried out after reaction.
The present embodiment can practice for extra big channel or fissured formation, and the consumption of concrete component as embodiment 2,4,6,8, can not repeat them here.
Experimental example
Here is temporary plugging agent Lab-evaluation of the present invention experiment:
1, adopt capillary viscosimeter for embodiment 1 ~ 8 and 9,10 test in conjunction with the embodiments, the content of test is as follows:
The initial viscosity (initial viscosity) of the stifled temporarily liquid made after the composition of embodiment 1,3,5,7 is composite, viscosity after then stifled liquid meets local water temporarily (meet water after viscosity); Continue to add the viscosity (after crosslinked viscosity) after the crosslinked fluid be made up of acetic acid, ammonium chloride and water in embodiment 2,4,6,8; Gel breaks viscosity after glue (after broken glue viscosity).Test result in table 1,
Table 1 temporary plugging agent viscosity test table
2, the shunting steering test of temporary plugging agent is evaluated:
Test completes on pressure core flow tester, test method: be connected in parallel hypotonic, height simultaneously and ooze two pieces of cores, discharge capacity controls all the time at 1ml/min.Testing sequence is:
1. displacement simulation local water (2 ~ 3%NHC1
4solution), record records rock core original permeability K
0;
2. inject temporary plugging agent, termination of pumping reaction 30min, observe the pressure reduction change of core two ends;
3. acidizing procedures displacement acid solution routinely, termination of pumping reaction 30min;
4. displacement simulation local water, record is final rate of permeation K1 after recording rock core acidifying.
Calculate two pieces of drill core permeability rates and increase multiple proportions.
The change of rate of permeation before and after table 2 rock core flowing experiment
Display is tested: after injection acid liquid reaction for some time by table 2, most permeable zone core is completely by shutoff, acid solution proceeds to hyposmosis core, four groups of core tests in parallel, hyposmosis drill core permeability rate is obtained for improvement to a certain degree, this shows, the turning efficiency of temporary plugging agent is obviously, illustrates that this temporary plugging agent has the characteristic of low leak-off, Low Damage, strong shunting.
3, water injection well test
Certain water injection well, penetrates layers apart 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 of water fillings, and each section of injection allocation is 50/20m
3/ d.At present at pump pressure 16.4MPa, under the pressure of oil pressure 15MPa, full well water suction 57m
3/ d, wherein VII 15. VII 18 does not absorb water.The last acidifying of this well is 2007.9.24-29 day acidifying VII 2.3/15.18, and after acidifying, full well water suction is qualified, daily water-injection rate 12 ↗ 80m
3/ d, current VII 15.18 do not absorb water.
This well site operation, after injecting temporary plugging agent, operation pressure causes 27MPa by 18MPa rising, and carry out conventional acidizing treatment subsequently, operation pressure is down to 22MPa by 27MPa.Test VII 15.18 after measure, under oil pressure 16Mpa, day note 112m
3, after throwing 1.8mm water is chewed and controlled water filling, under oil pressure 15MPa, day note 18m
3/ d, this well adds up augmented injection 2316m
3, still remain valid at present.This well site operation achieves good shunting and turns to acidizing effect.
Claims (5)
1. an oil reservoir stifled composition temporarily, is characterized in that: comprise the clean diversion agent XT-25A of 2-20 weight part and the sodium salicylate of 10-20 weight part;
Also comprise the acetic acid of 2 ~ 10 weight parts, the ammonium chloride of 1 ~ 10 weight part and the water of 80 ~ 97 parts;
Wherein clean diversion agent XT-25A is the industrial goods that Xuan Tai Industrial Co., Ltd. of Xinxiang City sells.
2. oil reservoir according to claim 1 stifled composition temporarily, is characterized in that: the total amount of described acetic acid, ammonium chloride and water is 100 parts.
3. oil reservoir blocks up an application method for composition temporarily as claimed in claim 1, it is characterized in that: comprise the following steps:
1) get 2 ~ 20 parts of clean diversion agent XT-25A, the sodium salicylate adding 10 ~ 20 parts stirs until all dissolve, obtained stifled liquid temporarily;
2) first clean diversion agent XT-25A is clamp-oned in the wellbore as spacer pad, be squeezed in pit shaft by blocking up liquid temporarily again, then clean diversion agent XT-25A is clamp-oned as spacer pad, the crosslinked fluid be made up of the ammonium chloride of the acetic acid of 2 ~ 10 weight parts, 1 ~ 10 weight part and the water mixing and stirring of 80 ~ 97 parts is added in pit shaft, finally add water and replace to zone of interest, closing well reacts;
3) subsequent construction can be carried out after reaction.
4. application method according to claim 3, is characterized in that: the total amount of described acetic acid, ammonium chloride and water is 100 parts.
5. the application method according to any one of claim 3 ~ 4, is characterized in that: step 2) the described closing well reaction times is 30 ~ 60min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN102925124A CN102925124A (en) | 2013-02-13 |
| CN102925124B true CN102925124B (en) | 2015-12-02 |
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Families Citing this family (4)
| 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 |
| 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 |
| 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 |
| 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 |
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| CA2405256C (en) * | 2000-04-05 | 2009-06-02 | Schlumberger Canada Limited | Viscosity reduction of viscoelastic surfactant based fluids |
| CN1313563C (en) * | 2004-09-23 | 2007-05-02 | 中国石油天然气股份有限公司 | Composition of clean fracturing fluid additives and method for fracturing stratum |
| CN102453481B (en) * | 2011-01-21 | 2013-09-18 | 中国石油大学(北京) | Acidic visco-elastic fluid, its preparation method and application thereof |
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