CN105927200B - A kind of method of hyposmosis heavy oil wells volume increase - Google Patents
A kind of method of hyposmosis heavy oil wells volume increase Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000295 fuel oil Substances 0.000 title claims abstract description 24
- 239000003129 oil well Substances 0.000 claims abstract description 59
- 239000003921 oil Substances 0.000 claims abstract description 46
- 238000012545 processing Methods 0.000 claims abstract description 20
- 230000000638 stimulation Effects 0.000 claims abstract description 20
- 238000012216 screening Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 25
- 238000006073 displacement reaction Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 11
- 239000003945 anionic surfactant Substances 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 6
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 5
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 5
- 150000001298 alcohols Chemical class 0.000 claims description 5
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 5
- 229960003237 betaine Drugs 0.000 claims description 5
- 150000007942 carboxylates Chemical class 0.000 claims description 5
- 239000003093 cationic surfactant Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- -1 sulfuric acid ester Chemical class 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 150000001408 amides Chemical class 0.000 claims description 2
- 125000000623 heterocyclic group Chemical group 0.000 claims description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 2
- 150000003871 sulfonates Chemical class 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002888 zwitterionic surfactant Substances 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims 1
- 150000001450 anions Chemical class 0.000 claims 1
- 150000001768 cations Chemical group 0.000 claims 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims 1
- 239000010452 phosphate Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 description 9
- 241000237858 Gastropoda Species 0.000 description 5
- 238000010793 Steam injection (oil industry) Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 3
- 235000020681 well water Nutrition 0.000 description 3
- 239000002349 well water Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Lubricants (AREA)
Abstract
The invention belongs to technical field of tertiary oil recovery, and in particular to a kind of method of hyposmosis heavy oil wells volume increase, this method specifically include following steps：The screening of oil well；The pressure break of oil well；The single well stimulation processing of oil well；The processing of well wellbore.The present invention has the characteristics that simple for process and operability is strong, is conducive to field popularization application；The present invention's is with strong points, and the present invention targetedly selects the technological measure of series according to the characteristics of hyposmosis heavy oil wells, therefore, oily well yield and the term of validity can be significantly increased, individual well oil increment is more than 1000t, and the term of validity is more than 3 years, and input-output ratio is more than 1:5.Therefore, present invention is generally applicable in the field test of hyposmosis heavy oil wells volume increase.
Description
Technical field
The invention belongs to technical field of tertiary oil recovery, and in particular to a kind of method of hyposmosis heavy oil wells volume increase.
Background technology
Low-permeability oil deposit permeability is less than 10 × 10-3um2, into oil field after high water-cut development period, around how improving
Water drive oil effect improves well yield, steady oil control water or oil increasing precipitation, improves reservoir water drive recovery ratio, is always oil field development
Technical staff studies the problem of tackling key problem.The existing waterflooding extraction mode of hyposmosis waterflooding reservoir, waterflood recovery efficiency factor is 25%
Hereinafter, still there is a large amount of oil in place that can not be converted into crude output, the huge waste of petroleum resources is caused.
Viscous crude is due to asphalt colloid content height, and wax content is few, thus viscosity is high, flow difficulties, exploits difficult, mesh
Before, cyclic steam injection tech is the main method of the current thickened oil recovery in China, and the whole nation there are about 80% heavy oil production is gulped down by steam
Spit acquisition.But there is the following aspects in cyclic steam injection tech：(1) generation steam cost is high, especially in water
The area of shortage of resources and water price costliness, water process are costly；(2) due to steam injection, oil well heat loss is shaked out, casing damage
Situations such as it is more serious, influence the implementation of the utilization rate of oil wells and technological measure；(3) with the increase of steam soak round, nearly well
The aqueous rising in area consumes most of steam heat, and thermal energy Quality degree of effective utilization is deteriorated, and effectiveness is caused to be deteriorated；
(4) heavy oil wells of the non-thermal recovery completion in part, can not carry out steam injection.
By literature search, the patent No. " ZL201010205368.3 ", a kind of entitled " low permeability oil field surfactant flooding
Finish ", the present invention relates to a kind of nonionic-anion surfactant oil displacement agents of low permeability oil field displacement of reservoir oil volume increase；By weight
Percentage be 0.1~3% polyoxyethylene sorbitan monooleate, 4~7% neopelex, 3~5%
2- acrylamide-2-methyl propane sulfonics, 2~4% organic solvents, remaining is water.The present invention has a disadvantage that and deficiency：Using
Single surface-active oil displacement agent can improve the displacement efficiency of low-permeability oil deposit, but cannot effectively improve oil reservoir involves body
Therefore product, affects the degree for improving recovery ratio to a certain extent；Chemical oil displacement agent dosage is big, and chemical oil displacement agent price
Costliness causes chemical flooding cost of investment higher, and therefore, input-output ratio is relatively low.
Invention content
The purpose of the present invention is providing a kind of method of hyposmosis heavy oil wells volume increase in view of the deficiencies of the prior art, the party
Method carries out pressure break to hyposmosis heavy oil wells first, improves the porosity and permeance property of oil well；Secondly, N is utilized2And chemical surface
Active oil displacement agent carries out the single well stimulation processing of more rounds, and oily well yield is significantly increased；Finally, well wellbore is carried out
Viscosity reduction processing prevents crude oil during well wellbore lifts since the reduction of temperature causes the viscosity of crude oil to reduce, flows
Property reduce, so as to affect the normal production of oil well.This method has the characteristics that simple for process, specific aim and operability are strong,
The field test results of hyposmosis heavy oil wells can be effectively improved.
A kind of method of hyposmosis heavy oil wells volume increase, which is characterized in that specifically include following steps：
（1）The screening of oil well
The selection criteria of oil well is：Reservoir temperature is less than 50 × 10 less than 90 DEG C, permeability-3μm2, ground viscosity of crude ﹤
5000mPa.s, core intersection are more than 1m.
（2）Wellfracturing
Select the crack quantity of pressure break according to the thickness h of oil reservoir, the length in crack is 20 ~ 50m, 2 ~ 5m of fracture width, oil
The fracturing fluid of well pressure break is aqueous fracturing fluid.
（3）The processing of oil well single well stimulation
Utilize high pressure pump truck N2It is injected in the oil jacket annular space of oil well after pressure break with chemical surfactant, injection mode is
Divide four slugs, the first slug injection liquid N2；Second slug injects chemical surfactant；Third slug injection liquid N2；The
Four slugs inject water flooding displacement fluid, wherein, first and third slug liquid N2Injection rate be respectively 6-8m3And 3-5m3, change
Learn surfactant mass concentration for 0.3-0.5%, volume injection rate=（0.2-0.3）× crack quantity × fracture length × is split
Slit width degree × core intersection, the injection rate of water flooding displacement fluid is 6-10m3, displacement fluid drives a well life after having noted after stewing well 20-30d
Production, the period of single well stimulation is 12-18 months, and the number of single well stimulation is 2-3 times.
（4）The processing of well wellbore
The processing of well wellbore is carried out during oil well single well stimulation opening well and making production, using dosing pump by oil-soluble viscosity reducer
The pit shaft of oil well is injected from the oil jacket annular space of oil well, oil-soluble viscosity reducer adds period adding for 20-30d, per round
It measures as 80-100kg.
The crack quantity be h≤2m when pressure break crack quantity 1 ~ 2,5m ＜ h ＜ 2m when pressure break crack quantity 3
~ 5, h >=5m when pressure break crack quantity 6 ~ 8.
The chemical surfactant is anion surfactant, cationic surfactant, amphoteric ion surface
One kind in activating agent and nonionic surfactant.
The anion surfactant be metal carboxylate, Sulfonates and sulfuric acid ester in one kind, the sun
Ionic surface active agent is one kind in amine salt, quaternary ammonium salt and heterocyclic, and the zwitterionic surfactant is phosphorus
One kind in acid esters type and betaine type, the nonionic surfactant are alkyl polyglycoside type, polyoxyethylene-type and alkanol
One kind in acid amide type.
The oil-soluble viscosity reducer is made of aromatic hydrocarbon and alcohols, and mass concentration is respectively 0.5-1.0% and 0.3-
0.5%。
The present invention is directed to the characteristics of hyposmosis heavy oil wells, carries out pressure break to hyposmosis heavy oil wells first, improves the hole of oil well
Gap and permeance property；Secondly, using injecting N2The single well stimulation processing of more rounds is carried out with chemical surface activity oil displacement agent, greatly
Improve to amplitude hyposmosis viscous crude well yield；Finally, the viscosity reduction processing of well wellbore is carried out, prevents crude oil from being lifted in well wellbore
Since the reduction of temperature causes the reduction of viscosity of crude, mobility to reduce during rising, so as to affect the normal life of oil well
Production.This method has the characteristics that simple for process, specific aim and operability are strong, can effectively improve the production of hyposmosis heavy oil wells
Amount, individual well oil increment are more than 1000t, and the term of validity is more than 3 years.
Present invention has the advantages that：
（1）The present invention has the characteristics that simple for process and operability is strong, is conducive to field popularization application；
（2）The present invention and the method for heat extraction by steam injection with it is at low cost, risk is low and maintenance cost is low, and will not to tubing string
It causes to corrode.
（3）The present invention's is with strong points, and the present invention targetedly selects series according to the characteristics of hyposmosis heavy oil wells
Therefore, oily well yield and the term of validity can be significantly increased in technological measure, individual well oil increment is more than 1000t, and the term of validity is more than
3 years, input-output ratio was more than 1:5.
Specific embodiment
The present invention is described in further detail with reference to specific embodiment, and with reference to data.It should be understood that these embodiments
Solely for the purpose of illustration the present invention rather than limit the scope of the invention in any way.
Embodiment 1
Certain oilfield A21, 80 DEG C of reservoir temperature, permeability 45 × 10-3μm2, viscosity of crude 3560mPa.s, core intersection
3.2m, well day oil-producing 5.0t before testing, aqueous 90.2%, using the method for the present invention in oil well A21Implement field test, specifically
Implementation steps are as follows：
（1）The screening of oil well
The selection criteria of oil well is：Reservoir temperature is less than 50 × 10 less than 90 DEG C, permeability-3μm2, ground viscosity of crude ﹤
5000mPa.s, core intersection are more than 1m；Oil well A2180 DEG C of reservoir temperature, permeability 45 × 10-3μm2, ground viscosity of crude
3560mPa.s, core intersection 3.2m meet the screening criteria of oil well, can implement the present invention in the well.
（2）The pressure break of oil well
Fracturing fluid is aqueous fracturing fluid, and crack quantity is 4, the length in crack is 30m, fracture width 3m.
（3）The single well stimulation processing of oil well
Utilize high pressure pump truck N2It is injected in the oil jacket annular space of oil well after pressure break with metal carboxylate anion surfactant,
Injection mode is point four slugs, and the first slug injects liquid N2；Second slug injects metal carboxylate anion surfactant；
Third slug injection liquid N2；4th slug injects water flooding displacement fluid, wherein, first and third slug liquid N2Injection rate
Respectively 6m3And 4m3, the mass concentration of metal carboxylate anion surfactant is 0.3%, volume injection rate=0.2 × 4 × 30
×3×3.2=230.4m3, the injection rate of water flooding displacement fluid is 8m3, displacement fluid opening well and making production, individual well after stewing well 25d after having noted
The period handled up is 18 months, and the number of single well stimulation is 2 times.
（4）The processing of well wellbore
The processing of well wellbore is carried out during oil well single well stimulation opening well and making production, using dosing pump by oil-soluble viscosity reducer
The pit shaft of oil well is injected from the oil jacket annular space of oil well, the period that adds of oil-soluble viscosity reducer is 30d, is per the dosage of round
100kg, the oil-soluble viscosity reducer are made of aromatic hydrocarbon and alcohols, and mass concentration is respectively 0.5% and 0.4%.
In oil well A21After implementing the present invention, well water has dropped 6.5 percentage points, and the term of validity is 4 years, and averagely increase day by day oil
1.5t adds up to increase oil 2190t, input-output ratio 1:5.8, field test results are good.
Embodiment 2
Certain oilfield D3, 72 DEG C of reservoir temperature, permeability 15 × 10-3μm2, viscosity of crude 4320mPa.s, core intersection
2.5m, well day oil-producing 3.5t before testing, aqueous 97.2%, using the method for the present invention in oil well D3Implement field test, specifically
Implementation steps are as follows：
（1）The screening of oil well
The selection criteria of oil well is：Reservoir temperature is less than 50 × 10 less than 90 DEG C, permeability-3μm2, ground viscosity of crude ﹤
5000mPa.s, core intersection are more than 1m；Oil well D372 DEG C of reservoir temperature, permeability 15 × 10-3μm2, ground viscosity of crude
4320mPa.s, core intersection 2.5m meet the screening criteria of oil well, can implement the present invention in the well.
（2）The pressure break of oil well
Fracturing fluid is aqueous fracturing fluid, and crack quantity is 3, the length in crack is 20m, fracture width 5m.
（3）The single well stimulation processing of oil well
Utilize high pressure pump truck N2It is injected in the oil jacket annular space of oil well after pressure break with quaternary cationic surfactant,
Injection mode is point four slugs, and the first slug injects liquid N2；Second slug injects quaternary cationic surfactant；
Third slug injection liquid N2；4th slug injects water flooding displacement fluid, wherein, first and third slug liquid N2Injection rate
Respectively 7m3And 3m3, the mass concentration of quaternary cationic surfactant is 0.4%, volume injection rate=0.25 × 3 × 20
×5×2.5=187.5m3, the injection rate of water flooding displacement fluid is 10m3, displacement fluid opening well and making production, individual well after stewing well 30d after having noted
The period handled up is 16 months, and the number of single well stimulation is 2 times.
（4）The processing of well wellbore
The processing of well wellbore is carried out during oil well single well stimulation opening well and making production, using dosing pump by oil-soluble viscosity reducer
The pit shaft of oil well is injected from the oil jacket annular space of oil well, the period that adds of oil-soluble viscosity reducer is 20d, is per the dosage of round
90kg, the oil-soluble viscosity reducer are made of aromatic hydrocarbon and alcohols, and mass concentration is respectively 1.0% and 0.3%.
In oil well D3After implementing the present invention, well water has dropped 4.3 percentage points, and the term of validity is 4.5 years, is averagely increased day by day
Oily 1.3t adds up to increase oil 2135t, input-output ratio 1:6.5, field test results are good.
Embodiment 3
Certain oilfield E1, 65 DEG C of reservoir temperature, permeability 20 × 10-3μm2, viscosity of crude 4680mPa.s, core intersection
1.7m, well day oil-producing 2.0t before testing, aqueous 96.5%, using the method for the present invention in oil well E1Implement field test, specifically
Implementation steps are as follows：
（1）The screening of oil well
The selection criteria of oil well is：Reservoir temperature is less than 50 × 10 less than 90 DEG C, permeability-3μm2, ground viscosity of crude ﹤
5000mPa.s, core intersection are more than 1m；Oil well E165 DEG C of reservoir temperature, permeability 20 × 10-3μm2, ground viscosity of crude
4680mPa.s, core intersection 1.7m meet the screening criteria of oil well, can implement the present invention in the well.
（2）The pressure break of oil well
Fracturing fluid is aqueous fracturing fluid, and crack quantity is 2, the length in crack is 50m, fracture width 2m.
（3）The single well stimulation processing of oil well
Utilize high pressure pump truck N2It is noted in the oil jacket annular space of oil well after pressure break with betaine type amphoteric ionic surface active agent
Enter, injection mode is point four slugs, and the first slug injects liquid N2；Second slug injection betaine type amphoteric ion surface is lived
Property agent；Third slug injection liquid N2；4th slug injects water flooding displacement fluid, wherein, first and third slug liquid N2Note
It is respectively 8m to enter amount3And 5m3, the mass concentration of betaine type amphoteric ionic surface active agent is 0.5%, volume injection rate=0.3 ×
2×50×2×1.7=102m3, the injection rate of water flooding displacement fluid is 6m3, displacement fluid boils in a covered pot over a slow fire opening well and making production after well 20d after having noted, single
The period that well is handled up is 12 months, and the number of single well stimulation is 3 times.
（4）The processing of well wellbore
The processing of well wellbore is carried out during oil well single well stimulation opening well and making production, using dosing pump by oil-soluble viscosity reducer
The pit shaft of oil well is injected from the oil jacket annular space of oil well, the period that adds of oil-soluble viscosity reducer is 25d, is per the dosage of round
80kg, the oil-soluble viscosity reducer are made of aromatic hydrocarbon and alcohols, and mass concentration is respectively 0.8% and 0.5%.
In oil well E1After implementing the present invention, well water has dropped 7.2 percentage points, and the term of validity is 4 years, and averagely increase day by day oil
2.1t adds up to increase oil 3066t, input-output ratio 1:7, field test results are good.
It is obvious to a person skilled in the art that the present invention is not limited to the details of above-mentioned exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requirement rather than above description limit, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in each embodiment can also be properly combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (8)
- A kind of 1. method of hyposmosis heavy oil wells volume increase, which is characterized in that specifically include following steps：(1) screening of oil wellThe selection criteria of oil well is：Reservoir temperature is less than 50 × 10 less than 90 DEG C, permeability-3μm2, ground viscosity of crude ﹤ 5000mPa.s, core intersection are more than 1m；(2) wellfracturingSelect the crack quantity of pressure break according to the thickness h of oil reservoir, the length in crack is 20~50m, 2~5m of fracture width, oil well The fracturing fluid of pressure break is aqueous fracturing fluid；(3) oil well single well stimulation is handledUtilize high pressure pump truck N2It is injected in the oil jacket annular space of oil well after pressure break with chemical surfactant, injection mode is divides four A slug, the first slug injection liquid N2；Second slug injects chemical surfactant；Third slug injection liquid N2；4th section Plug injection water flooding displacement fluid, wherein, first and third slug liquid N2Injection rate be respectively 6-8m3And 3-5m3, chemical table The mass concentration of face activating agent is 0.3-0.5%, volume injection rate=(0.2-0.3) × crack quantity × fracture length × crack Width × core intersection, the injection rate of water flooding displacement fluid is 6-10m3, displacement fluid opening well and making production after stewing well 20-30d after having noted, The period of single well stimulation is 12-18 months, and the number of single well stimulation is 2-3 times；(4) processing of well wellboreThe processing of well wellbore is carried out during oil well single well stimulation opening well and making production, using dosing pump by oil-soluble viscosity reducer from oil The pit shaft of oil well is injected in the oil jacket annular space of well, the period that adds of oil-soluble viscosity reducer is 20-30d, is per the dosage of round 80-100kg。
- A kind of 2. method of hyposmosis heavy oil wells volume increase according to claim 1, it is characterised in that the crack quantity Pressure break is split when the crack quantity 3~5 of pressure break, h >=5m when the crack quantity of pressure break 1~2,5m ＜ h ＜ 2m during for h≤2m Stitch quantity 6~8.
- A kind of 3. method of hyposmosis heavy oil wells volume increase according to claim 1 or 2, it is characterised in that the chemical table Face activating agent is anion surfactant, cationic surfactant, zwitterionic surfactant and non-ionic surface are lived One kind in property agent.
- A kind of 4. method of hyposmosis heavy oil wells volume increase according to claim 3, it is characterised in that the anion table Face activating agent is one kind in metal carboxylate, Sulfonates and sulfuric acid ester.
- A kind of 5. method of hyposmosis heavy oil wells volume increase according to claim 3, it is characterised in that the cation form Face activating agent is one kind in amine salt, quaternary ammonium salt and heterocyclic.
- A kind of 6. method of hyposmosis heavy oil wells volume increase according to claim 3, it is characterised in that the amphoteric ion Surfactant is one kind in phosphate type and betaine type.
- A kind of 7. method of hyposmosis heavy oil wells volume increase according to claim 3, it is characterised in that the nonionic table Face activating agent is one kind in alkyl polyglycoside type, polyoxyethylene-type and alkylol amide type.
- A kind of 8. method of hyposmosis heavy oil wells volume increase according to claim 1, it is characterised in that the oil-soluble drop Stick is made of aromatic hydrocarbon and alcohols, and mass concentration is respectively 0.5-1.0% and 0.3-0.5%.
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|---|---|---|---|---|
| US4842065A (en) * | 1988-05-11 | 1989-06-27 | Marathon Oil Company | Oil recovery process employing cyclic wettability alteration |
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