CN104912529A - Nanometer oil production technology for increasing desorption rate - Google Patents
Nanometer oil production technology for increasing desorption rate Download PDFInfo
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Abstract
The invention belongs to the field of oil reservoirs for increasing storage, increasing production and increasing a recovery ratio. An nanometer oil production technology comprises the following steps of, firstly, generally implementing a nanometer pressure reducing and injection increasing technology on a water injection well, and generally implementing a nanometer storage increasing and production increasing technology on an oil well; and then, implementing a slug type variable-component and variable-consumption oil driving technology on the water injection well by using an oil displacement agent NDA for a long time. The blocking of a polymer and the profile control of air foam are removed, so that injected water is uniformly pushed on a section; rocks, latent acid, an imbibition agent and a neutral wettability agent are dissolved and constructed in a united manner, so that nanometer apertures and micron apertures are enlarged, the desorption rate is increased, and the purposes of reducing pressure, increasing injection, increasing storage and increasing production are realized. The nanometer oil production technology can produce residual oil of oil reservoirs of medium high permeable sandstone and carbonate rocks, and can also increase the desorption rate of adsorbed oil of oil reservoir bedrock of the medium high permeable sandstone and the carbonate rocks, ultra-compact oil reservoirs, and shale oil reservoirs, so that industrial production is obtained.
Description
Invention field: this invention belongs to oil reservoir increasing the storage volume increase and improves recovery ratio.
Technical background:
The first, the oil reservoir remaining oil reserves now developed are huge.
Conventional oil displacement agent can displace the part oil that height oozes macropore seam, high seepage hole slotted wall face and in the remaining oil of low seepage hole seam cannot displace.Oneself exploits an oil reservoir extraction 30%-50% of 30-50 at present in China.Existing oil-gas reservoir of having developed is all that reserves abundance is very high can the reservoir of seepage flow.
The considerable Sichuan carbonate oil field of reserves does not have industrialized developing so far.Development difficulty is very big, and crack is extremely grown, water injection well and oil well apart ten kilometers, water injection well water filling, and oil well several days is with regard to water breakthrough; Basement rock is extremely fine and close.Whole oil field only has several mouthfuls of water injection wells.Sichuan carbonate oil field development is a world-class difficult problem.
The second, adsorbed oil reserves are huge especially.
Existing petroleum geology, petroleum works are all the petroleum works based on seepage flow.Existing petroleum geology, petroleum works only consider to be greater than porosity cutoff, can the reservoir of seepage flow.The oil-gas reservoir of China is all generally hypotonic, Oil in Super-low Permeability.Be no matter hypotonic, Oil in Super-low Permeability, in ooze, high permeability reservoir, permeability grade is all very large.
Molecular diameter about the 0.5nm of condensate.Molecular diameter about the 0.9nm of light oil.The molecular diameter 10nm-200nm of pitch.The molecular diameter 100nm-200nm of paraffin.The about 50nm-300nm of molecular diameter of shale oil.For in the nanoscale hole below porosity cutoff, being enriched in nanoaperture with ADSORPTION STATE can not the flood tide adsorbed oil of seepage flow, does not all consider both at home and abroad to produce.
Shale oil is actual is adsorbed oil.All enrichment shale oil after whole eight gulf, the road group 200 meters of Tarim Basin In Xinjiang.The oil-sand also enrichment adsorbed oil of shallow-layer.Also enrichment adsorbed oil in the basement rock of thick oil reservoir.
For adsorbed oil, also there is no real development theories and method both at home and abroad.
Adsorbed oil reserves are extremely huge.Rock is finer and close, and the content of adsorbed oil is larger.In the fine and close basement rock of the oil reservoir of oneself exploitation, the content of adsorbed oil is also abnormal large.Nanometer displacement agent is built, link up, expand nano-pore seam, builds nanoscale, micron order, grade map cracking, improves adsorbed oil desorption rate, makes the abnormal huge adsorbed oil suitability for industrialized production of reserves.
Summary of the invention:
The object of the invention is water injection well increasing injection, oil well increasing the storage is increased production.
First generally carry out nanometer increasing injection technology at water injection well, generally carry out nanometer increasing the storage yield-increasing technology at oil well.Then carry out slug formula for a long time at water injection well nanometer displacement agent NDA and become a point change consumption technology of reservoir sweep.
First carry out well-flushing at water injection well, oil well, note clean dissolving fracturing fluid, the slow acid solution of liquid cleaning, solid-state clean retarded acid and solid-state clean potential acid, hydrochloric acid clean retarded acid, ultralow temperature dissolve shrinkage makes seam fracturing fluid, make water injection well increasing injection, oil well increasing the storage is increased production.Inject nanometer displacement agent at water injection well, remove polymer plugging and air foam profile control, injection water is evenly advanced on section; By dissolving rock, potential acid, imbibition, construction is combined in neutral wetting agent, expansion nano-pore stitches, micron openings seam, and improve desorption rate, increasing injection, increasing the storage is increased production.Nanometer oil recovery technique both can extraction middle and high infiltration sandstone, Carbonate Reservoir remaining oil, the adsorbed oil desorption rate of middle and high infiltration sandstone and Carbonate Reservoir basement rock, super compact oil reservoir, shale oil oil reservoir can be improved again, obtain suitability for industrialized production.
The novelty of invention:
Water injection well carries out nanometer increasing injection technology, carries out nanometer increasing the storage yield-increasing technology, water injection well nanometer displacement agent NDA slug formula technology of reservoir sweep and associated construction program at oil well.
The practicality of invention:
In shale oil oil reservoir, adsorbed oil reserves are large.There is a large amount of remaining oils in the middle and high infiltration developed, hyper-tight sandstone oil reservoir and middle and high infiltration, super dense carbonate oil reservoir, in basement rock, have again a large amount of adsorbed oil.Adopt nanometer displacement agent NDA water flooding recovery energy industrialization exploitation remaining oil and adsorbed oil, increasing the storage is increased production.Nanometer displacement agent NDA demand is large, market large, required time has persistence.The economic benefit of nanometer displacement agent NDA, social benefit are all difficult to the appraisal.The first, the difficult remaining oil adopted of industrialization exploitation and the adsorbed oil cannot exploited now, alleviate worldwide energy demand, energy war can gradually reduce, and the disaster of energy war also can gradually reduce.The second, the energy of China completely can self-sufficiency through productive labour fast, and break through and blocks the world of CNPC, the Chinese speed reformed can walk quickening greatly.3rd, the exploitation of remaining oil and adsorbed oil not only can solve a large amount of employment, more importantly ensures the energy demand that national all trades and professions grow at top speed, and is that country creates a large amount of income.
Note: basement rock refers to the Minerals And Rocks of reservoir rock skeleton.
The displacement of reservoir oil of example 1. sandstone oil reservoir nanometer
Feature: dissolve corrosion sandstone; Dissolve polymer.Surfactant mainly uses cation and nonionic surface active agent.
Sandstone oil reservoir nanometer displacement of reservoir oil integral construction scheme:
One, water injection well generally carries out nanometer increasing injection technology.
Every mouthful of water injection well all carries out or selectively carries out nanometer increasing injection technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer increasing injection construction sequence is as follows:
The first step: well-flushing.Flushing fluid is filled a prescription: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSsa of potential sour CAPsa+0.5%.Well-flushing liquid measure: 20m
3~ 30m
3.Adopt the positive well-flushing of huge discharge.The stolen goods things such as the oil in wash oil well pit shaft, mud, sandstone, Ca, Mg and Fe dirt.Return and drain washing well raffinate.
Second step: note is clean dissolves fracturing fluid CFssa.Formula: 1% clean dissolving fracturing fluid CFssa+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The clean fracturing fluid that dissolves can dissolve cement in nano-pore seam and wall, and the cement in the nano-pore seam utilizing the time official post of dissolving to clean to dissolve fracturing fluid to flow through and wall, form the nano-seam net of first phase guide.
3rd step: the slow acid solution of note liquid cleaning.Formula: 1% liquid cleaning retarded acid CArLsa+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.On the nano-seam net basis of first phase guide, expand and extend first-phase nano-seam net, forming second phase nanometer, micron seam net.
4th step: note solid-state clean retarded acid and solid-state clean potential acid.Formula: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSsa of potential sour CAPsa+0.5%.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Further expansion and extend the second phase nanometer, micron seam net, formed third phase nanometer, micron seam net.
5th step: note hydrochloric acid clean retarded acid.Formula: 0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFasa+12% [31%HCI]+2% [41%HF]+all the other add water.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the third phase, forming fourth phase nanometer, micron, millimeter stitch net.
6th step: note ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFsa.Formula: 1% ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFsa+99% water.Injection rate 50m
3~ 1000m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the fourth phase, forming fifth phase nanometer, micron, millimeter, centimetre stitch net.
Above implantation step and inject liquid optional select wherein several reconfigure.
After completing above-mentioned steps, must the row's of returning raffinate immediately, substantially return water filling immediately after drained raffinate.
Two, oil well generally carries out nanometer increasing the storage yield-increasing technology.
Every mouthful of oil well all carries out or selectively carries out nanometer increasing the storage yield-increasing technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer volume increase content is identical with claim 2 with construction sequence.
Special attention will be given to: after completing nanometer volume increase construction, must the row's of returning raffinate immediately, substantially to return after drained raffinate opening well and making production immediately.
Three, water injection well nanometer displacement agent NDA slug formula technology of reservoir sweep.
First slug: the formula of nanometer displacement agent NDA1sa: solvent+5% ~ 30% potential acid+10% ~ 30% neutral wetting agent of sandstone is dissolved in 10% ~ 40% foam+10% ~ 30% dissolve polymer solvent+10% ~ 20% imbibition agent+10% ~ 30%.If do not note polymer, do not add dissolve polymer solvent.If permeability extreme difference is large, foam dosage is 40% or more; If permeability extreme difference is very little, foam dosage is about 10%, or does not add.
Displacement of reservoir oil water filling is filled a prescription: 15% ~ 20% air+1% nanometer displacement agent NDA1sa+79% ~ 84% water.Injection Section cock body amasss: 0.05PV.
Second slug: the formula of nanometer displacement agent NDA2sa: solvent+20% ~ 30% potential acid+10% ~ 30% neutral wetting agent of sandstone is dissolved in 10% ~ 30% foam+10% ~ 20% imbibition agent+20% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription:: 10% ~ 15% air+0.5% nanometer displacement agent NDA2sa+84.5% ~ 89.5% water.Injection Section cock body amasss: 0.25PV.
3rd slug: the formula of nanometer displacement agent NDA3sa: solvent+25% ~ 30% potential acid+10% ~ 30% neutral wetting agent of sandstone is dissolved in 10% ~ 20% foam+10% ~ 20% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 10% air+0.3% nanometer displacement agent NDA3+89.7% ~ 94.7% water.Injection Section cock body amasss: 0.35PV.
4th slug: the formula of nanometer displacement agent NDA4sa: solvent+5% ~ 20% potential acid+20% ~ 30% neutral wetting agent of sandstone is dissolved in 5% ~ 10% foam+15% ~ 30% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 8% air+0.2% nanometer displacement agent NDA4sa+92.8% ~ 94.8% water.Injection Section cock body amasss: 0.35PV.
The nanometer oil recovery technique of four, oil field development overall region
Water injection well in the whole region of oil field development all carries out water injection well nanometer increasing injection technology, and oil well all carries out oil well nanometer increasing the storage yield-increasing technology, and then all water injection wells all carry out nanometer displacement agent NDA slug formula technology of reservoir sweep.The overall nanometer of water injection well, producing well is recovered the oil, and forms developing zone overall volume desorb, improves overall volume desorption rate completely, realize the adsorbed oil desorb in basement rock and suitability for industrialized production, increase reserves; Improve seepage velocity simultaneously, improve output.
Five, continuously mutually overall nanometer oil recovery is carried out one by one with well group
First preferentially test at a well group, after success of the test, promote at adjacent well group successively, and promote nanometer oil recovery technique in whole oil field.
Example 2. Carbonate Reservoir nanometer displacement agent NDAca
Feature: dissolve corrosion carbonate rock; Foam quality is high.Surfactant mainly uses anion and nonionic surface active agent.
Carbonate Reservoir rice displacement of reservoir oil integral construction scheme:
One, water injection well generally carries out nanometer increasing injection technology.
Every mouthful of water injection well all carries out or selectively carries out nanometer increasing injection technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer increasing injection construction sequence is as follows:
The first step: well-flushing.Flushing fluid is filled a prescription: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSca of potential sour CAPca+0.5%.Well-flushing liquid measure: 20m
3~ 30m
3.Adopt the positive well-flushing of huge discharge.The stolen goods things such as the oil in wash oil well pit shaft, mud, sandstone, Ca, Mg and Fe dirt.Return and drain washing well raffinate.
Second step: note is clean dissolves fracturing fluid CFsca.Formula: 1% clean dissolving fracturing fluid CFsca+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The clean fracturing fluid that dissolves can dissolve cement in nano-pore seam and wall, and the cement in the nano-pore seam utilizing the time official post of dissolving to clean to dissolve fracturing fluid to flow through and wall, form the nano-seam net of first phase guide.
3rd step: the slow acid solution of note liquid cleaning.Formula: 1% liquid cleaning retarded acid CArLca+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.On the nano-seam net basis of first phase guide, expand and extend first-phase nano-seam net, forming second phase nanometer, micron seam net.
4th step: note solid-state clean retarded acid and solid-state clean potential acid.Formula: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSca of potential sour CAPca+0.5%.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Further expansion and extend the second phase nanometer, micron seam net, formed third phase nanometer, micron seam net.
5th step: note hydrochloric acid clean retarded acid.Formula: 0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFaca+12% [31%HCI]+2% [41%HF]+all the other add water.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the third phase, forming fourth phase nanometer, micron, millimeter stitch net.
6th step: note ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFca formula: 1% ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFca+99% water.Injection rate 50m
3~ 1000m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the fourth phase, forming fifth phase nanometer, micron, millimeter, centimetre stitch net.
Above implantation step and inject liquid optional select wherein several reconfigure.
After completing above-mentioned steps, must the row's of returning raffinate immediately, substantially return water filling immediately after drained raffinate.
Two, oil well generally carries out nanometer increasing the storage yield-increasing technology.
Every mouthful of oil well all carries out or selectively carries out nanometer increasing the storage yield-increasing technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer volume increase content is identical with claim 2 with construction sequence.
Special attention will be given to: after completing nanometer volume increase construction, must the row's of returning raffinate immediately, substantially to return after drained raffinate opening well and making production immediately.
Three, water injection well nanometer displacement agent NDA slug formula technology of reservoir sweep.
First slug: the formula of nanometer displacement agent NDA1ca: solvent+5% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 30% ~ 40% foam+10% ~ 20% imbibition agent+10% ~ 30%.If do not note polymer, do not add dissolve polymer solvent.If permeability extreme difference is large, foam dosage is 40% or more; If permeability extreme difference is very little, foam dosage is about 10%, or does not add.
Displacement of reservoir oil water filling is filled a prescription: 15% ~ 20% air+1% nanometer displacement agent NDA1ca+79% ~ 84% water.Injection Section cock body amasss: 0.05PV.
Second slug: the formula of nanometer displacement agent NDA2ca: solvent+20% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 10% ~ 30% foam+10% ~ 20% imbibition agent+20% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription:: 10% ~ 15% air+0.5% nanometer displacement agent NDA2ca+84.5% ~ 89.5% water.Injection Section cock body amasss: 0.25PV.
3rd slug: the formula of nanometer displacement agent NDA3ca: solvent+25% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 10% ~ 20% foam+10% ~ 20% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 10% air+0.3% nanometer displacement agent NDA3ca+89.7% ~ 94.7% water.Injection Section cock body amasss: 0.35PV.
4th slug: the formula of nanometer displacement agent NDA4ca: solvent+5% ~ 20% potential acid+20% ~ 30% neutral wetting agent of shale is dissolved in 5% ~ 10% foam+15% ~ 30% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 8% air+0.2% nanometer displacement agent NDA4ca+92.8% ~ 94.8% water.Injection Section cock body amasss: 0.35PV.
The nanometer oil recovery technique of four, oil field development overall region
Water injection well in the whole region of oil field development all carries out water injection well nanometer increasing injection technology, and oil well all carries out oil well nanometer increasing the storage yield-increasing technology, and then all water injection wells all carry out nanometer displacement agent NDA slug formula technology of reservoir sweep.The overall nanometer of water injection well, producing well is recovered the oil, and forms developing zone overall volume desorb, improves overall volume desorption rate completely, realize the adsorbed oil desorb in basement rock and suitability for industrialized production, increase reserves; Improve seepage velocity simultaneously, improve output.
Five, continuously mutually overall nanometer oil recovery is carried out one by one with well group
First preferentially test at a well group, after success of the test, promote at adjacent well group successively, and promote nanometer oil recovery technique in whole oil field.
Example 3. shale oil oil reservoir nanometer displacement agent NDAsh
Feature: dissolve corrosion shale, imbibition, wettability are good.
Shale oil oil reservoir rice displacement of reservoir oil integral construction scheme:
One, water injection well generally carries out nanometer increasing injection technology.
Every mouthful of water injection well all carries out or selectively carries out nanometer increasing injection technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer increasing injection construction sequence is as follows:
The first step: well-flushing.Flushing fluid is filled a prescription: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSsh well-flushing liquid measure of potential sour CAPsh+0.5%: 20m
3~ 30m
3.Adopt the positive well-flushing of huge discharge.The stolen goods things such as the oil in wash oil well pit shaft, mud, sandstone, Ca, Mg and Fe dirt.Return and drain washing well raffinate.
Second step: note is clean dissolves fracturing fluid CFssh.Formula: 1% clean dissolving fracturing fluid CFssh+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The clean fracturing fluid that dissolves can dissolve cement in nano-pore seam and wall, and the cement in the nano-pore seam utilizing the time official post of dissolving to clean to dissolve fracturing fluid to flow through and wall, form the nano-seam net of first phase guide.
3rd step: the slow acid solution of note liquid cleaning.Formula: 1% liquid cleaning retarded acid CArLsh+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.On the nano-seam net basis of first phase guide, expand and extend first-phase nano-seam net, forming second phase nanometer, micron seam net.
4th step: note solid-state clean retarded acid and solid-state clean potential acid.Formula: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArSsh of potential sour CAPsh+0.5%.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Further expansion and extend the second phase nanometer, micron seam net, formed third phase nanometer, micron seam net.
5th step: note hydrochloric acid clean retarded acid.Formula: 0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFash+12% [31%HCI]+2% [41%HF]+all the other add water.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the third phase, forming fourth phase nanometer, micron, millimeter stitch net.
6th step: note ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFsh formula: 1% ultralow temperature dissolves shrinkage makes seam fracturing fluid DCFsh+99% water.Injection rate 50m
3~ 1000m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the fourth phase, forming fifth phase nanometer, micron, millimeter, centimetre stitch net.
Above implantation step and inject liquid optional select wherein several reconfigure.
After completing above-mentioned steps, must the row's of returning raffinate immediately, substantially return water filling immediately after drained raffinate.
Two, oil well generally carries out nanometer increasing the storage yield-increasing technology.
Every mouthful of oil well all carries out or selectively carries out nanometer increasing the storage yield-increasing technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer volume increase content is identical with claim 2 with construction sequence.
Special attention will be given to: after completing nanometer volume increase construction, must the row's of returning raffinate immediately, substantially to return after drained raffinate opening well and making production immediately.
Three, water injection well nanometer displacement agent NDA slug formula technology of reservoir sweep.
First slug: the formula of nanometer displacement agent NDA1sh: solvent+5% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 30% ~ 40% foam+10% ~ 20% imbibition agent+10% ~ 30%.If do not note polymer, do not add dissolve polymer solvent.If permeability extreme difference is large, foam dosage is 40% or more; If permeability extreme difference is very little, foam dosage is about 10%, or does not add.
Displacement of reservoir oil water filling is filled a prescription: 15% ~ 20% air+1% nanometer displacement agent NDA1sh+79% ~ 84% water.Injection Section cock body amasss: 0.05PV.
Second slug: the formula of nanometer displacement agent NDA2sh: solvent+20% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 10% ~ 30% foam+10% ~ 20% imbibition agent+20% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription:: 10% ~ 15% air+0.5% nanometer displacement agent NDA2sh+84.5% ~ 89.5% water.Injection Section cock body amasss: 0.25PV.
3rd slug: the formula of nanometer displacement agent NDA3sh: solvent+25% ~ 30% potential acid+10% ~ 30% neutral wetting agent of shale is dissolved in 10% ~ 20% foam+10% ~ 20% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 10% air+0.3% nanometer displacement agent NDA3sh+89.7% ~ 94.7% water.Injection Section cock body amasss: 0.35PV.
4th slug: the formula of nanometer displacement agent NDA4sh: solvent+5% ~ 20% potential acid+20% ~ 30% neutral wetting agent of shale is dissolved in 5% ~ 10% foam+15% ~ 30% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 8% air+0.2% nanometer displacement agent NDA4sh+92.8% ~ 94.8% water.Injection Section cock body amasss: 0.35PV.
The nanometer oil recovery technique of four, oil field development overall region
Water injection well in the whole region of oil field development all carries out water injection well nanometer increasing injection technology, and oil well all carries out oil well nanometer increasing the storage yield-increasing technology, and then all water injection wells all carry out nanometer displacement agent NDA slug formula technology of reservoir sweep.The overall nanometer of water injection well, producing well is recovered the oil, and forms developing zone overall volume desorb, improves overall volume desorption rate completely, realize the adsorbed oil desorb in basement rock and suitability for industrialized production, increase reserves; Improve seepage velocity simultaneously, improve output.
Five, continuously mutually overall nanometer oil recovery is carried out one by one with well group
First preferentially test at a well group, after success of the test, promote at adjacent well group successively, and promote nanometer oil recovery technique in whole oil field.
Claims (9)
1. improve the nanometer oil recovery technique of desorption rate, it is characterized in that carrying out overall nanometer increasing the storage augmented injection yield-increasing technology at oil reservoir.First generally carry out nanometer increasing injection technology at water injection well, generally carry out nanometer increasing the storage yield-increasing technology at oil well.Then carry out slug formula for a long time at water injection well nanometer displacement agent NDA and become a point change consumption technology of reservoir sweep.
2. according to it is characterized in that the general principle of water injection well nanometer increasing injection technology, general principle and general objective described in claim 1.General principle expands nano-pore seam, and release rock stress, reduces injection pressure; Expand micron openings seam, increase injection rate.General principle is that water injection pressure reduces maximum, and daily water-injection rate increases maximum, increasing injection by expanding nano-pore seam, micron openings seam, release rock stress; Section permeability extreme difference reduces maximum.General objective is: water injection pressure reduces by 5% ~ 30%, and section permeability extreme difference reduces by 20% ~ 80%, and injectivity index improves 20% ~ 80%, and daily water-injection rate improves 0.5 ~ 20 times.
3., according to described in claim 1, it is characterized in that the general principle of oil well nanometer increasing the storage yield-increasing technology, general principle and general objective.General principle expands nano-pore seam, improves adsorbed oil desorption rate, increase reserves; Expand micron openings seam, improve diffusion velocity; Expand millimeter opening seam, improve seepage velocity, increasing the storage is increased production.
General principle is that adsorbed oil desorption rate improves maximum by expanding nano-pore seam; Expand micron openings seam, permeability improves maximum, and daily oil production increases maximum, and increasing the storage is increased production; Section permeability extreme difference reduces maximum.
General objective is: nano-pore seam, micron openings seam expand maximum, and daily oil production increases by 0.5 ~ 20 times.
4., according to described in claim 1, it is characterized in that the general principle of water injection well nanometer displacement agent slug formula technology of reservoir sweep, general principle and general objective.
General principle is: remove polymer plugging, adopts air foam adjustment water injection profile, injection water is evenly advanced on section according to section permeability extreme difference; By dissolving rock, potential acid, imbibition, construction is combined in neutral wetting agent, expansion nano-pore stitches, micron openings seam, and improve desorption rate, increasing injection, increasing the storage is increased production.
General principle is: accumulative water filling volume is minimum, and accumulative injection-production ratio is minimum, and water consumption rate is minimum, and injection water retaining in reservoir is minimum, and water drive reserves controlling extent is maximum, and water drive reserves development degree is maximum, and recoverable reserves recovery percent of reserves is maximum, and ultimate recovery is maximum.
General objective is: accumulative water filling volume 1.5PV, accumulative injection-production ratio is less than 1.2, and water consumption rate is less than 2.8m
3/ t, injection water retaining in reservoir is less than 60%, and water drive reserves controlling extent is greater than 50%, and water drive reserves development degree is greater than 40%, and recoverable reserves recovery percent of reserves is greater than 40%, and ultimate recovery is greater than 70%.
5., according to described in claim 1,2, it is characterized in that water injection well generally carries out nanometer increasing injection technology.Every mouthful of water injection well all carries out or selectively carries out nanometer increasing injection technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer increasing injection construction sequence is as follows:
The first step: well-flushing.Flushing fluid is filled a prescription: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArS of potential sour CAP+0.5%.Well-flushing liquid measure: 20m
3~ 30m
3.Adopt the positive well-flushing of huge discharge.The stolen goods things such as the oil in wash oil well pit shaft, mud, sandstone, Ca, Mg and Fe dirt.Return and drain washing well raffinate.
Second step: note is clean dissolves fracturing fluid CFs.Formula: 1% clean dissolving fracturing fluid CFs+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.The clean fracturing fluid that dissolves can dissolve cement in nano-pore seam and wall, and the cement in the nano-pore seam utilizing the time official post of dissolving to clean to dissolve fracturing fluid to flow through and wall, form the nano-seam net of first phase guide.
3rd step: the slow acid solution of note liquid cleaning.Formula: 1% liquid cleaning retarded acid CArL+99% water.Injection rate 50m
3~ 200m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.First small displacement 0.5 ~ 1m
3/ min injects, and progressively improve discharge capacity, maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.On the nano-seam net basis of first phase guide, expand and extend first-phase nano-seam net, forming second phase nanometer, micron seam net.
4th step: note solid-state clean retarded acid and solid-state clean potential acid.Formula: 0.5% stratum self-generating cleans the solid-state clean retarded acid CArS of potential sour CAP+0.5%.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Further expansion and extend the second phase nanometer, micron seam net, formed third phase nanometer, micron seam net.
5th step: note hydrochloric acid clean retarded acid.Formula: 0.1% ~ 1% acidic group viscoplasticity cleaning foam fracturing fluid VCFa+12% [31%HCI]+2% [41%HF]+all the other add water.Injection rate 50m
3~ 400m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the third phase, forming fourth phase nanometer, micron, millimeter stitch net.
6th step: note ultralow temperature dissolves shrinkage makes seam fracturing fluid DCF.Formula: 1% ultralow temperature dissolves shrinkage makes seam fracturing fluid DCF+99% water.Injection rate 50m
3~ 1000m
3.Inject discharge capacity: 0.5m
3/ min ~ 6m
3/ min.Maximum operation pressure is less than oil pipe or sleeve pipe limit fracture pressure.Expand further again and extend nanometer, the micron seam net of the fourth phase, forming fifth phase nanometer, micron, millimeter, centimetre stitch net.
Above implantation step and inject liquid optional select wherein several reconfigure.
After completing above-mentioned steps, must the row's of returning raffinate immediately, substantially return water filling immediately after drained raffinate.
6., according to described in claim 1,3, it is characterized in that oil well generally carries out nanometer increasing the storage yield-increasing technology.Every mouthful of oil well all carries out or selectively carries out nanometer increasing the storage yield-increasing technology, every mouthful of well liquid measure 300m
3~ 2000m
3, nanometer volume increase content is identical with claim 2 with construction sequence.
Special attention will be given to: after completing nanometer volume increase construction, must the row's of returning raffinate immediately, substantially to return after drained raffinate opening well and making production immediately.
7., according to described in claim 1,4, it is characterized in that water injection well nanometer displacement agent NDA slug formula technology of reservoir sweep.
First slug: the formula of nanometer displacement agent NDA1: solvent+5% ~ 30% potential acid+10% ~ 30% neutral wetting agent of rock is dissolved in 10% ~ 40% foam+10% ~ 30% dissolve polymer solvent+10% ~ 20% imbibition agent+10% ~ 30%.If do not note polymer, do not add dissolve polymer solvent.If permeability extreme difference is large, foam dosage is 40% or more; If permeability extreme difference is very little, foam dosage is about 10%, or does not add.
Displacement of reservoir oil water filling is filled a prescription: 15% ~ 20% air+1% nanometer displacement agent NDA1+79% ~ 84% water.Injection Section cock body amasss: 0.05PV.
Second slug: the formula of nanometer displacement agent NDA2: solvent+20% ~ 30% potential acid+10% ~ 30% neutral wetting agent of rock is dissolved in 10% ~ 30% foam+10% ~ 20% imbibition agent+20% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription:: 10% ~ 15% air+0.5% nanometer displacement agent NDA2+84.5% ~ 89.5% water.Injection Section cock body amasss: 0.25PV.
3rd slug: the formula of nanometer displacement agent NDA3: solvent+25% ~ 30% potential acid+10% ~ 30% neutral wetting agent of rock is dissolved in 10% ~ 20% foam+10% ~ 20% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 10% air+0.3% nanometer displacement agent NDA3+89.7% ~ 94.7% water.Injection Section cock body amasss: 0.35PV.
4th slug: the formula of nanometer displacement agent NDA4: solvent+5% ~ 10% potential acid+20% ~ 30% neutral wetting agent of rock is dissolved in 5% ~ 10% foam+15% ~ 20% imbibition agent+25% ~ 30%.
Displacement of reservoir oil water filling is filled a prescription: 5% ~ 8% air+0.2% nanometer displacement agent NDA4+92.8% ~ 94.8% water.Injection Section cock body amasss: 0.35PV.
8. according to described in claim 1-7, it is characterized in that nanometer oil recovery technique emphasizes Area development, water injection well in the whole region of oil field development all carries out water injection well nanometer increasing injection technology, oil well all carries out oil well nanometer increasing the storage yield-increasing technology, and then all water injection wells all carry out nanometer displacement agent NDA slug formula technology of reservoir sweep.The overall nanometer of water injection well, producing well is recovered the oil, and forms developing zone overall volume desorb, improves overall volume desorption rate completely, realize the adsorbed oil desorb in basement rock and suitability for industrialized production, increase reserves; Improve seepage velocity simultaneously, improve output.
9. according to described in claim 1-8, it is characterized in that first preferentially testing at a well group, after success of the test, promote at adjacent well group successively, and promote nanometer oil recovery technique in whole oil field.
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Application publication date: 20150916 |