CN105756649A - Yield increase method for low-permeability wax-bearing oil well - Google Patents
Yield increase method for low-permeability wax-bearing oil well Download PDFInfo
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- CN105756649A CN105756649A CN201610108610.2A CN201610108610A CN105756649A CN 105756649 A CN105756649 A CN 105756649A CN 201610108610 A CN201610108610 A CN 201610108610A CN 105756649 A CN105756649 A CN 105756649A
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- oil well
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- hyposmosis
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a yield increase method for a low-permeability wax-bearing oil well.The method specifically includes the following steps of oil well screening, oil well fracturing, single-well huff and puff processing of the oil well, oil well shaft processing and the field test effect evaluation stage.The method has the advantages of being simple in process and high in operability and is beneficial to field application and popularization.The method is high in pertinence, serial process measures are selected in a targeted mode according to the characteristics of the low-permeability wax-bearing oil well, and therefore the yield and validity period of the oil well can be substantially increased, the single-well oil increment is larger than 500 t, the validity period is longer than 3 years, and the input-output ratio is larger than 1:5.Therefore, the method can be widely applied to field tests of yield increase of the low-permeability wax-bearing oil well.
Description
Technical field
The present invention relates to oil exploitation technology, the method being specifically related to the volume increase of a kind of hyposmosis Waxy Production Wells.
Background technology
Hyposmosis content of wax oil reservoir, reservoir permeability is lower than 50 × 10-3μm2, the paraffin content of Crude Oil is more than 10%, and crude oil wax precipitation point is higher, slightly below the temperature of oil reservoir；As long as stratum is degassed, viscosity of crude rises fast, easily analyses wax in oil reservoir.At present, such oil reservoir is generally adopted waterflooding extraction, but inject water and easily cause the cold damage to oil reservoir, after oil reservoir wax deposition, the development effectiveness of water filling is made to be deteriorated, therefore, current hyposmosis content of wax oil reservoir recovery percent of reserves is general not high, lower than 30%, therefore, in the urgent need to a kind of method that can increase substantially hyposmosis content of wax oil recovery.
Pass through literature search, the patent No. " ZL03156478.x ", name is called the method for the exploitation content of wax low-permeability oil deposit that " method of Wax-bearing low-seepage oil deposit steam injection heating recovery " describes a kind of steam soak and steam flooding combines, this invention have drawbacks in that (1) heat extraction by steam injection cost is high, has a big risk；(2) corrosion of tubing string and maintenance cost are high；(3) owing to low-permeability oil deposit permeability is low, the poor fluidity of crude oil, the amplitude that heat extraction by steam injection improves recovery ratio is low, limited efficiency；(4) alternative condition of oil reservoir is harsher, especially that the requirement of reservoir thickness and the degree of depth is higher；(5) high wax content oil easily analysis wax that reduces due to temperature in the process that well wellbore lifts causes the blocking of well wellbore.
Summary of the invention
A kind of method that it is an object of the invention to provide hyposmosis Waxy Production Wells to increase production for the deficiencies in the prior art, first high-content wax oil well is carried out pressure break by the method, improves porosity and the permeance property of oil well；Secondly, utilize the single well stimulation that Wax removing agent carries out many rounds to process, oil well yield is significantly increased；Finally, the microbial wax control carrying out well wellbore processes, it is prevented that high wax content oil reduction due to temperature in the process that well wellbore lift causes crude oil wax, thus have impact on normally producing of oil well.The method has that technique is simple, specific aim and workable feature, can be effectively improved the field test results of hyposmosis Waxy Production Wells.
The method of a kind of hyposmosis Waxy Production Wells volume increase, it is characterised in that specifically include following steps:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 85 DEG C, permeability is less than 50 × 10-3μm2, wax content in crude oil more than 10%, core intersection more than 1m, coefficient of permeability variation less than 1, the degree of depth of oil reservoir is less than 2500m.
(2) pressure break of oil well
Thickness h according to oil reservoir selects the crack quantity of pressure break, and the length in crack is 100～200m, fracture width 2～5m.
(3) single well stimulation of oil well processes
High pressure pump truck is utilized to be injected from the oil jacket annular space of oil well after pressure break by Wax removing agent, the injection rate volume number of Wax removing agent=(0.2-0.3) × crack quantity × fracture length × fracture width × core intersection, Wax removing agent injects 2-3m after having injected3Displacement fluid, displacement fluid opening well and making production after stewing well 7-10d after having noted, the cycle of single well stimulation is 12-18 month, and the number of times of single well stimulation is 3-5 time.
(4) process of well wellbore
The process of well wellbore is carried out during oil well single well stimulation opening well and making production, utilize dosing pump that Paraffin Removal strain and nutrient thereof are injected the pit shaft of oil well from the oil jacket annular space of oil well, Paraffin Removal strain and nutraceutical to add the cycle be 20-30d, the Paraffin Removal strain of every round and nutraceutical dosage thereof are 300-500kg.
Described fracturing fluid is the one in aqueous fracturing fluid, oil base fracturing fluid, Emulsified fracturing fluid and foam fracturing fluid.
The crack quantity 6～10 of pressure break when the crack quantity 3～5 of pressure break, h >=5m when the crack quantity of pressure break 1～2,5m < h < 2m when described crack quantity is h≤2m.
Described Wax removing agent is the one in oil base Wax removing agent, water based dewaxing agent and emulsion Wax removing agent.
2.0-3.0% when 1.0-1.5%, oil well paraffin content >=30% when 0.5-0.8%, 20%≤oil well paraffin content < 30% when the mass concentration of described Wax removing agent is 10% < oil well paraffin content < 20%.
Described displacement fluid is formation water or clear water.
Described Paraffin Removal strain is bacillus subtilis and Bacillus licheniformis, and the nutrient of Paraffin Removal strain forms and component respectively starch quality concentration 1.5-2.0%, peptone mass concentration 0.5-0.8%, dipotassium hydrogen phosphate mass concentration 0.2-0.4%.
The present invention is directed to the feature of hyposmosis Waxy Production Wells, first hyposmosis wax oil well is carried out pressure break, improve porosity and the permeance property of oil well；Secondly, utilize the single well stimulation that Wax removing agent carries out many rounds to process, hyposmosis waxy oil well yield is significantly increased；Finally, the microbial wax control carrying out well wellbore processes, it is prevented that high wax content oil reduction due to temperature in the process that well wellbore lift causes crude oil wax, thus have impact on normally producing of oil well.The method has that technique is simple, specific aim and workable feature, can be effectively improved hyposmosis waxy oil well yield, and individual well oil increment is more than 500t, and effect duration, input-output ratio was more than 1:5 more than 3 years.
The medicine have the advantages that
(1) present invention has the advantages that technique is simple and workable, is conducive to field popularization application；
(2) method of the present invention and heat extraction by steam injection has that cost is low, risk is low and maintenance cost is low, and tubing string is not resulted in corrosion.
(3) present invention's is with strong points, and the present invention selects the technological measure of series targetedly according to the feature of hyposmosis Waxy Production Wells, therefore, oil well yield and effect duration can be significantly increased, individual well oil increment is more than 500t, and effect duration, input-output ratio was more than 1:5 more than 3 years.
Detailed description of the invention
Below in conjunction with specific embodiment, and with reference to data, the present invention is described in further detail.Should be understood that these embodiments present invention solely for the purpose of illustration, but not the scope being intended to limit the present invention in any manner.
Embodiment 1
Certain oilfield A, reservoir temperature 70 DEG C, permeability 18 × 10-3μm2, wax content in crude oil 25.6%, core intersection 3.4m, coefficient of permeability variation 0.9, oil well degree of depth 2560m, this well day oil-producing 3.2t before test, moisture 96.8%, utilize the method for the present invention to implement scene test at oil well A, be embodied as step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 85 DEG C, permeability is less than 50 × 10-3μm2, wax content in crude oil more than 10%, core intersection more than 1m, coefficient of permeability variation less than 1, the degree of depth of oil well is less than 2500m；The reservoir temperature of oil well A 70 DEG C, permeability 18 × 10-3μm2, wax content in crude oil 25.6%, core intersection 3.4m, coefficient of permeability variation 0.9, oil well degree of depth 2560m, meet the screening criteria of oil well, it is possible to this well implement the present invention.
(2) pressure break of oil well
Fracturing fluid is aqueous fracturing fluid, and crack quantity is 4, the length in crack is 150m, fracture width 2m.
(3) single well stimulation of oil well processes
High pressure pump truck is utilized to be injected from the oil jacket annular space of oil well after pressure break by Wax removing agent, the injection rate volume number=0.3 × 4 × 150 × 2 × 3.4=1224m of Wax removing agent3, Wax removing agent injects 2m after having injected3Displacement fluid formation water, displacement fluid formation water opening well and making production after stewing 8d after having noted, the cycle of single well stimulation is 12 months, and the number of times of single well stimulation is 5 times；Described Wax removing agent is emulsion Wax removing agent, mass concentration is 1.2%.
(4) process of well wellbore
The process of well wellbore is carried out during oil well single well stimulation opening well and making production, utilize dosing pump that Paraffin Removal strain and nutrient thereof are injected the pit shaft of oil well from the oil jacket annular space of oil well, Paraffin Removal strain and nutraceutical to add the cycle be 30d, the Paraffin Removal strain of every round and nutraceutical dosage thereof are 500kg；Described Paraffin Removal strain is bacillus subtilis and Bacillus licheniformis, and the nutrient of Paraffin Removal strain forms and component respectively starch quality concentration 2.0%, peptone mass concentration 0.7%, dipotassium hydrogen phosphate mass concentration 0.4%.
After oil well A implements the present invention, well water have dropped 7.8 percentage points, and effect duration is 6 years, and on average increase day by day oil 1.1t, and accumulative increasing oil 2409t, input-output ratio is 1:10.5, and field test results is good.
Embodiment 2
Certain oilfield B, reservoir temperature 58 DEG C, permeability 23 × 10-3μm2, wax content in crude oil 33.2%, core intersection 2.7m, coefficient of permeability variation 0.6, oil well degree of depth 1530m, this well day oil-producing 1.3t before test, moisture 97.8%, utilize the method for the present invention to implement scene test at oil well B, be embodied as step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 85 DEG C, permeability is less than 50 × 10-3μm2, wax content in crude oil more than 10%, core intersection more than 1m, coefficient of permeability variation less than 1, the degree of depth of oil well is less than 2500m；The reservoir temperature of oil well B 58 DEG C, permeability 23 × 10-3μm2, wax content in crude oil 33.2%, core intersection 2.7m, coefficient of permeability variation 0.6, oil well degree of depth 1530m, meet the screening criteria of oil well, it is possible to this well implement the present invention.
(2) pressure break of oil well
Fracturing fluid is oil base fracturing fluid, and crack quantity is 3, the length in crack is 200m, fracture width 5m.
(3) single well stimulation of oil well processes
High pressure pump truck is utilized to be injected from the oil jacket annular space of oil well after pressure break by Wax removing agent, injection rate volume number=0.2 × 3 × 200 × 5 × 2.7=1.620 × 10 of Wax removing agent3m3, Wax removing agent injects 3m after having injected3Displacement fluid formation water, displacement fluid formation water opening well and making production after stewing 10d after having noted, the cycle of single well stimulation is 18 months, and the number of times of single well stimulation is 3 times；Described Wax removing agent is oil base Wax removing agent, mass concentration is 2.3%.
(4) process of well wellbore
The process of well wellbore is carried out during oil well single well stimulation opening well and making production, utilize dosing pump that Paraffin Removal strain and nutrient thereof are injected the pit shaft of oil well from the oil jacket annular space of oil well, Paraffin Removal strain and nutraceutical to add the cycle be 20d, the Paraffin Removal strain of every round and nutraceutical dosage thereof are 400kg；Described Paraffin Removal strain is bacillus subtilis and Bacillus licheniformis, and the nutrient of Paraffin Removal strain forms and component respectively starch quality concentration 1.5%, peptone mass concentration 0.5%, dipotassium hydrogen phosphate mass concentration 0.3%.
After oil well B implements the present invention, well water have dropped 6.8 percentage points, and effect duration is 5 years, and on average increase day by day oil 0.8t, and accumulative increasing oil 1460t, input-output ratio is 1:7.2, and field test results is good.
Embodiment 3
Certain oilfield C, reservoir temperature 77 DEG C, permeability 9 × 10-3μm2, wax content in crude oil 22.3%, core intersection 4.8m, coefficient of permeability variation 0.7, oil well degree of depth 1768m, this well day oil-producing 1.3t before test, moisture 98.2%, utilize the method for the present invention to implement scene test at oil well C, be embodied as step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 85 DEG C, permeability is less than 50 × 10-3μm2, wax content in crude oil more than 10%, core intersection more than 1m, coefficient of permeability variation less than 1, the degree of depth of oil well is less than 2500m；The reservoir temperature of oil well H 77 DEG C, permeability 9 × 10-3μm2, wax content in crude oil 22.3%, core intersection 4.8m, coefficient of permeability variation 0.7, oil well degree of depth 1768m, meet the screening criteria of oil well, it is possible to this well implement the present invention.
(2) pressure break of oil well
Fracturing fluid is Emulsified fracturing fluid, and crack quantity is 5, the length in crack is 100m, fracture width 3m.
(3) single well stimulation of oil well processes
High pressure pump truck is utilized to be injected from the oil jacket annular space of oil well after pressure break by Wax removing agent, injection rate volume number=0.2 × 5 × 100 × 3 × 4.8=1.44 × 10 of Wax removing agent3m3, Wax removing agent injects 2m after having injected3Displacement fluid clear water, displacement fluid clear water opening well and making production after stewing 7d after having noted, the cycle of single well stimulation is 16 months, and the number of times of single well stimulation is 4 times；Described Wax removing agent is water based dewaxing agent, mass concentration is 1.2%.
(4) process of well wellbore
The process of well wellbore is carried out during oil well single well stimulation opening well and making production, utilize dosing pump that Paraffin Removal strain and nutrient thereof are injected the pit shaft of oil well from the oil jacket annular space of oil well, Paraffin Removal strain and nutraceutical to add the cycle be 25d, the Paraffin Removal strain of every round and nutraceutical dosage thereof are 300kg；Described Paraffin Removal strain is bacillus subtilis and Bacillus licheniformis, and the nutrient of Paraffin Removal strain forms and component respectively starch quality concentration 1.6%, peptone mass concentration 0.8%, dipotassium hydrogen phosphate mass concentration 0.2%.
After oil well C implements the present invention, well water have dropped 11.5 percentage points, and effect duration is 6 years, and on average increase day by day oil 1.2t, and accumulative increasing oil 2628t, input-output ratio is 1:10.5, and field test results is good.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (7)
1. the method for a hyposmosis Waxy Production Wells volume increase, it is characterised in that specifically include following steps:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 85 DEG C, permeability is less than 50 × 10-3μm2, wax content in crude oil more than 10%, core intersection more than 1m, coefficient of permeability variation less than 1, the degree of depth of oil reservoir is less than 2500m；
(2) pressure break of oil well
Thickness h according to oil reservoir selects the crack quantity of pressure break, and the length in crack is 100～200m, fracture width 2～5m；
(3) single well stimulation of oil well processes
High pressure pump truck is utilized to be injected from the oil jacket annular space of oil well after pressure break by Wax removing agent, the injection rate volume number of Wax removing agent=(0.2-0.3) × crack quantity × fracture length × fracture width × core intersection, Wax removing agent injects 2-3m after having injected3Displacement fluid, displacement fluid opening well and making production after stewing well 7-10d after having noted, the cycle of single well stimulation is 12-18 month, and the number of times of single well stimulation is 3-5 time；
(4) process of well wellbore
The process of well wellbore is carried out during oil well single well stimulation opening well and making production, utilize dosing pump that Paraffin Removal strain and nutrient thereof are injected the pit shaft of oil well from the oil jacket annular space of oil well, Paraffin Removal strain and nutraceutical to add the cycle be 20-30d, the Paraffin Removal strain of every round and nutraceutical dosage thereof are 300-500kg.
2. the method for hyposmosis Waxy Production Wells according to claim 1 volume increase, it is characterised in that described fracturing fluid is the one in aqueous fracturing fluid, oil base fracturing fluid, Emulsified fracturing fluid and foam fracturing fluid.
3. the method for hyposmosis Waxy Production Wells according to claim 1 and 2 volume increase, it is characterized in that, described crack quantity is: the crack quantity 6～10 of pressure break when the crack quantity 3～5 of pressure break, h >=5m when the crack quantity of pressure break 1～2,5m < h < 2m during h >=2m.
4. the method for hyposmosis Waxy Production Wells according to claim 3 volume increase, it is characterised in that described Wax removing agent is the one in oil base Wax removing agent, water based dewaxing agent and emulsion Wax removing agent.
5. the method for hyposmosis Waxy Production Wells according to claim 4 volume increase, it is characterized in that, the mass concentration of described Wax removing agent is: 2.0-3.0% when 1.0-1.5%, oil well paraffin content >=30% when 0.5-0.8%, 20%≤oil well paraffin content < 30% during 10% < oil well paraffin content < 20%.
6. the method for hyposmosis Waxy Production Wells according to claim 1 volume increase, it is characterised in that it is characterized in that described displacement fluid is formation water or clear water.
7. the method for hyposmosis Waxy Production Wells according to claim 1 volume increase, it is characterized in that, described Paraffin Removal strain is bacillus subtilis and Bacillus licheniformis, and the nutrient of Paraffin Removal strain forms and component respectively starch quality concentration 1.5-2.0%, peptone mass concentration 0.5-0.8%, dipotassium hydrogen phosphate mass concentration 0.2-0.4%.
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Cited By (4)
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| CN106907130A (en) * | 2017-04-25 | 2017-06-30 | 中国石油化工股份有限公司 | A kind of method of Waxy Production Wells microbial single well treatment |
| CN108915637A (en) * | 2018-07-06 | 2018-11-30 | 陕西延长石油(集团)有限责任公司研究院 | A kind of wax-proofing agent being added when pressing crack construction and the preparation method and application thereof |
| CN110079292A (en) * | 2019-03-22 | 2019-08-02 | 中国石油化工股份有限公司 | High-content wax oil reservoir fracturing composition, high-content wax oil reservoir fracturing fluid and high-content wax oil reservoir composite fracturing fluid |
| CN110593816A (en) * | 2018-06-12 | 2019-12-20 | 中国石油天然气股份有限公司 | Method for preventing condensate gas well from waxing by using solid wax inhibitor |
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| CN106907130A (en) * | 2017-04-25 | 2017-06-30 | 中国石油化工股份有限公司 | A kind of method of Waxy Production Wells microbial single well treatment |
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| CN110079292A (en) * | 2019-03-22 | 2019-08-02 | 中国石油化工股份有限公司 | High-content wax oil reservoir fracturing composition, high-content wax oil reservoir fracturing fluid and high-content wax oil reservoir composite fracturing fluid |
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