CN105756649B - A kind of method of hyposmosis Waxy Production Wells volume increase - Google Patents
A kind of method of hyposmosis Waxy Production Wells volume increase Download PDFInfo
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- CN105756649B CN105756649B CN201610108610.2A CN201610108610A CN105756649B CN 105756649 B CN105756649 B CN 105756649B CN 201610108610 A CN201610108610 A CN 201610108610A CN 105756649 B CN105756649 B CN 105756649B
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- hyposmosis
- oil well
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Classifications
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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
-
- 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 technical field of tertiary oil recovery, and in particular to a kind of method of hyposmosis Waxy Production 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；Field test results evaluation phase.The present invention has the characteristics of technique is simple and workable, is advantageous 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 Waxy Production Wells, therefore, oily well yield and the term of validity can be significantly increased, individual well oil increment is more than 500t, 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 Waxy Production Wells volume increase.
Description
Technical field
The present invention relates to oil exploitation technology, and in particular to a kind of method of hyposmosis Waxy Production Wells volume increase.
Background technology
Hyposmosis content of wax oil reservoir, reservoir permeability are less than 50 × 10-3μm2, the paraffin content of Crude Oil is more than 10%, crude oil
Wax precipitation point is higher, slightly below the temperature of oil reservoir；As long as stratum deaerates, viscosity of crude rises fast, easy analysis wax in oil reservoir.At present, should
Class oil reservoir typically uses waterflooding extraction, but injects water and easily cause cold damage to oil reservoir, after oil reservoir wax deposition, imitates the exploitation of water filling
Fruit is deteriorated, and therefore, hyposmosis content of wax oil reservoir recovery percent of reserves is not universal high at present, and less than 30%, therefore, there is an urgent need to a kind of energy is big
The method that amplitude improves hyposmosis content of wax oil recovery.
Pass through literature search, the patent No. " ZL03156478.x ", the entitled " side of Wax-bearing low-seepage oil deposit steam injection heating recovery
Method " describes the method that a kind of steam soak and steam drive the exploitation content of wax low-permeability oil deposit being combined, the shortcomings that the invention
In：(1) heat extraction by steam injection cost is high, and risk is big；(2) corrosion of tubing string and maintenance cost are high；(3) because low-permeability oil deposit permeates
Rate is low, the poor fluidity of crude oil, and the amplitude that heat extraction by steam injection improves recovery ratio is low, and effect is limited；(4) to the alternative condition of oil reservoir
Compare harsh, the requirement especially to reservoir thickness and depth is higher；(5) process that high wax content oil lifts in well wellbore
In due to the reduction of temperature, easily analysis wax causes the blocking of well wellbore.
The content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art and provides a kind of method of hyposmosis Waxy Production Wells volume increase, is somebody's turn to do
Method carries out pressure break to high-content wax oil well first, improves the porosity and permeance property of oil well；Secondly, carried out using Wax removing agent
The single well stimulation processing of more rounds, is significantly increased oily well yield；Finally, at the microbial wax control for carrying out well wellbore
Reason, prevent high wax content oil during well wellbore lifts because the reduction of temperature causes crude oil wax, so as to have impact on
The normal production of oil well.This method have technique simple, specific aim and it is workable the characteristics of, hyposmosis can be effectively improved
The field test results of Waxy Production Wells.
A kind of method 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 is less than 50 × 10 less than 85 DEG C, permeability-3μm2, wax content in crude oil is more than
10%th, core intersection is more than 1m, coefficient of permeability variation is less than the 1, depth of oil reservoir and is less than 2500m.
(2) pressure break of oil well
Selecting the crack quantity of pressure break according to the thickness h of oil reservoir, the length in crack is 100~200m, fracture width 2~
5m。
(3) the single well stimulation processing of oil well
Wax removing agent is injected after pressure break in the oil jacket annular space of oil well using high pressure pump truck, the injection rate body of Wax removing agent
Product=(0.2-0.3) × crack quantity × fracture length × fracture width × core intersection, noted after the completion of Wax removing agent injection
Enter 2-3m3Displacement 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 months, single
The number that well is handled up is 3-5 times.
(4) 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 Paraffin Removal strain and
Its nutrients injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Paraffin Removal strain and its nutrients is 20-
30d, the dosage of Paraffin Removal strain and its nutrients per round is 300-500kg.
Described fracturing fluid is one kind in aqueous fracturing fluid, oil base fracturing fluid, Emulsified fracturing fluid and foam fracturing fluid.
When described crack quantity is h≤2m when the crack quantity of pressure break 1~2,5m ＜ h ＜ 2m pressure break crack quantity
3~5, h >=5m when pressure break crack quantity 6~10.
Described Wax removing agent is one kind in oil base Wax removing agent, water based dewaxing agent and emulsion Wax removing agent.
0.5-0.8%, 20%≤oil when the mass concentration of described Wax removing agent is 10% ＜ oil well paraffin content ＜ 20%
2.0-3.0% when 1.0-1.5%, oil well paraffin content during well paraffin content ＜ 30% >=30%.
Described displacement fluid is stratum water or clear water.
Described Paraffin Removal strain is bacillus subtilis and bacillus licheniformis, the nutrients composition of Paraffin Removal strain and
Component is 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 characteristics of present invention is directed to hyposmosis Waxy Production Wells, pressure break is carried out to hyposmosis wax oil well first, improves oil well
Porosity and permeance property；Secondly, the single well stimulation that more rounds are carried out using Wax removing agent is handled, and hyposmosis is significantly increased
Waxy oil well yield；Finally, the microbial wax control processing of well wellbore is carried out, prevents high wax content oil from being lifted in well wellbore
Because the reduction of temperature causes crude oil wax during rising, so as to have impact on the normal production of oil well.This method has technique
Simply, specific aim and it is workable the characteristics of, hyposmosis waxy oil well yield can be effectively improved, individual well oil increment is more than
500t, the term of validity are more than 3 years, and input-output ratio is more than 1:5.
Present invention has the advantages that：
(1) present invention has the characteristics of technique is simple and workable, is advantageous to field popularization application；
(2) present invention has that cost is low, risk is low and maintenance cost is low with the method for heat extraction by steam injection, and will not to tubing string
Cause to corrode.
(3) present invention's is with strong points, and the present invention targetedly selects series according to the characteristics of hyposmosis Waxy Production Wells
Technological measure, accordingly, it is capable to which oily well yield and the term of validity is significantly increased, individual well oil increment is more than 500t, and the term of validity is big
In 3 years, input-output ratio was more than 1:5.
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
It is of the invention solely for the purpose of illustration, rather than the scope limiting the invention in any way.
Embodiment 1
Certain oilfield A, 70 DEG C of reservoir temperature, permeability 18 × 10-3μm2, wax content in crude oil 25.6%, core intersection
3.4m, coefficient of permeability variation 0.9, the depth 2560m of oil well, well day oil-producing 3.2t before testing, aqueous 96.8%, utilize this
The method of invention implements field test in oil well A, and specific implementation step is as follows：
(1) screening of oil well
The selection standard of oil well is：Reservoir temperature is less than 50 × 10 less than 85 DEG C, permeability-3μm2, wax content in crude oil is more than
10%th, core intersection is more than 1m, coefficient of permeability variation is less than the 1, depth of oil well and is less than 2500m；Oil well 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, the depth of oil well
2560m is spent, meets the screening criteria of oil well, the present invention can be implemented in the well.
(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) the single well stimulation processing of oil well
Wax removing agent is injected after pressure break in the oil jacket annular space of oil well using high pressure pump truck, the injection rate body of Wax removing agent
Product=0.3 × 4 × 150 × 2 × 3.4=1224m3, inject 2m after the completion of Wax removing agent injection3Replacement stratum water, replace
Stratum water boils in a covered pot over a slow fire opening well and making production after 8d after having noted, the cycle of single well stimulation is 12 months, and the number of single well stimulation is 5 times；It is described
Wax removing agent be emulsion Wax removing agent, mass concentration 1.2%.
(4) 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 Paraffin Removal strain and
Its nutrients injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Paraffin Removal strain and its nutrients is 30d,
The dosage of Paraffin Removal strain and its nutrients per round is 500kg；Described Paraffin Removal strain be bacillus subtilis and
Bacillus licheniformis, the nutrients composition and component of Paraffin Removal strain are respectively that starch quality concentration 2.0%, peptone quality are dense
Degree 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 the term of validity is 6 years, and averagely increase day by day oil
1.1t, add up to increase oily 2409t, input-output ratio 1:10.5, field test results are good.
Embodiment 2
Certain oilfield B, 58 DEG C of reservoir temperature, permeability 23 × 10-3μm2, wax content in crude oil 33.2%, core intersection
2.7m, coefficient of permeability variation 0.6, the depth 1530m of oil well, well day oil-producing 1.3t before testing, aqueous 97.8%, utilize this
The method of invention implements field test in oil well B, and specific implementation step is as follows：
(1) screening of oil well
The selection standard of oil well is：Reservoir temperature is less than 50 × 10 less than 85 DEG C, permeability-3μm2, wax content in crude oil is more than
10%th, core intersection is more than 1m, coefficient of permeability variation is less than the 1, depth of oil well and is less than 2500m；Oil well 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, the depth of oil well
1530m is spent, meets the screening criteria of oil well, the present invention can be implemented in the well.
(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) the single well stimulation processing of oil well
Wax removing agent is injected after pressure break in the oil jacket annular space of oil well using high pressure pump truck, the injection rate body of Wax removing agent
Product=0.2 × 3 × 200 × 5 × 2.7=1.620 × 103m3, inject 3m after the completion of Wax removing agent injection3Replacement stratum
Water, replace and opening well and making production after 10d is boiled in a covered pot over a slow fire after stratum water has been noted, the cycle of single well stimulation is 18 months, and the number of single well stimulation is 3
It is secondary；Described Wax removing agent is oil base Wax removing agent, mass concentration 2.3%.
(4) 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 Paraffin Removal strain and
Its nutrients injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Paraffin Removal strain and its nutrients is 20d,
The dosage of Paraffin Removal strain and its nutrients per round is 400kg；Described Paraffin Removal strain be bacillus subtilis and
Bacillus licheniformis, the nutrients composition and component of Paraffin Removal strain are respectively that starch quality concentration 1.5%, peptone quality are dense
Degree 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 the term of validity is 5 years, and averagely increase day by day oil
0.8t, add up to increase oily 1460t, input-output ratio 1:7.2, field test results are good.
Embodiment 3
Certain oilfield C, 77 DEG C of reservoir temperature, permeability 9 × 10-3μm2, wax content in crude oil 22.3%, core intersection
4.8m, coefficient of permeability variation 0.7, the depth 1768m of oil well, well day oil-producing 1.3t before testing, aqueous 98.2%, utilize this
The method of invention implements field test in oil well C, and specific implementation step is as follows：
(1) screening of oil well
The selection standard of oil well is：Reservoir temperature is less than 50 × 10 less than 85 DEG C, permeability-3μm2, wax content in crude oil is more than
10%th, core intersection is more than 1m, coefficient of permeability variation is less than the 1, depth of oil well and is less than 2500m；Oil well H 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, the depth of oil well
1768m, meet the screening criteria of oil well, the present invention can be implemented in the well.
(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) the single well stimulation processing of oil well
Wax removing agent is injected after pressure break in the oil jacket annular space of oil well using high pressure pump truck, the injection rate body of Wax removing agent
Product=0.2 × 5 × 100 × 3 × 4.8=1.44 × 103m3, inject 2m after the completion of Wax removing agent injection3Displacement fluid clear water,
Displacement fluid clear water boils in a covered pot over a slow fire opening well and making production after 7d after having noted, the cycle of single well stimulation is 16 months, and the number of single well stimulation is 4 times；Institute
The Wax removing agent stated is water based dewaxing agent, mass concentration 1.2%.
(4) 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 Paraffin Removal strain and
Its nutrients injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Paraffin Removal strain and its nutrients is 25d,
The dosage of Paraffin Removal strain and its nutrients per round is 300kg；Described Paraffin Removal strain be bacillus subtilis and
Bacillus licheniformis, the nutrients composition and component of Paraffin Removal strain are respectively that starch quality concentration 1.6%, peptone quality are dense
Degree 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 the term of validity is 6 years, and averagely increase day by day oil
1.2t, add up to increase oily 2628t, input-output ratio 1:10.5, field test results are 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, 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, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (7)
- A kind of 1. method of hyposmosis Waxy Production Wells volume increase, it is characterised in that specifically include following steps：(1) screening of oil wellThe selection standard of oil well is：Reservoir temperature is less than 50 × 10 less than 85 DEG C, permeability-3μm2, wax content in crude oil is more than 10%th, core intersection is more than 1m, coefficient of permeability variation is less than the 1, depth of oil reservoir and is less than 2500m；(2) pressure break of oil wellThe crack quantity of pressure break is selected according to the thickness h of oil reservoir, the length in crack is 100~200m, 2~5m of fracture width；(3) the single well stimulation processing of oil wellWax removing agent is injected after pressure break in the oil jacket annular space of oil well using high pressure pump truck, the injection rate volume number of Wax removing agent =(0.2-0.3) × crack quantity × fracture length × fracture width × core intersection, inject 2- after the completion of Wax removing agent injection 3m3Displacement 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 months, and individual well gulps down The number told is 3-5 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 Paraffin Removal strain and its battalion To support thing and inject the pit shaft of oil well from the oil jacket annular space of oil well, the cycle that adds of Paraffin Removal strain and its nutrients is 20-30d, The dosage of Paraffin Removal strain and its nutrients per round is 300-500kg.
- 2. the method for hyposmosis Waxy Production Wells volume increase according to claim 1, it is characterised in that described fracturing fluid is water One kind in base fracturing fluid, oil base fracturing fluid, Emulsified fracturing fluid and foam fracturing fluid.
- 3. the method for hyposmosis Waxy Production Wells volume increase according to claim 1 or 2, it is characterised in that described fracture number Measure and be：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 Crack quantity 6~10.
- 4. the method for hyposmosis Waxy Production Wells according to claim 3 volume increase, it is characterised in that described Wax removing agent is One kind in oil base Wax removing agent, water based dewaxing agent and emulsion Wax removing agent.
- 5. the method for hyposmosis Waxy Production Wells volume increase according to claim 4, it is characterised in that described Wax removing agent Mass concentration is：1.0- when 0.5-0.8%, 20%≤oil well paraffin content ＜ 30% during 10% ＜ oil well paraffin content ＜ 20% 1.5%th, 2.0-3.0% during oil well paraffin content >=30%.
- 6. the method for hyposmosis Waxy Production Wells volume increase according to claim 1, it is characterised in that it is characterized in that described Displacement fluid is stratum water or clear water.
- 7. the method for hyposmosis Waxy Production Wells volume increase according to claim 1, it is characterised in that described Paraffin Removal strain For bacillus subtilis and bacillus licheniformis, the nutrients composition and component of Paraffin Removal strain are 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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN108915637B (en) * | 2018-07-06 | 2020-04-14 | 陕西延长石油(集团)有限责任公司研究院 | Wax inhibitor added during fracturing construction and 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 |
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Inventor after: Wang Chao Inventor after: Guan Lei Inventor after: Xiao Yixin Inventor after: Zheng Zhong Inventor after: He Yize Inventor after: Shi Xuyang Inventor after: Sun Xinyan Inventor after: Ye Dehui Inventor after: Xiong Xie Inventor after: Cui Qiang Inventor before: Liu Qin |
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Effective date of registration: 20230620 Address after: Room 1703 and 1708, Changqing Building, 151 Weiyang Road, Xi'an Economic and Technological Development Zone, Shaanxi Province, 710018 Patentee after: Xi'an Changqing Tongxin Petroleum Technology Co.,Ltd. Address before: 264000 housing 1, 108 Shengtai Road, Zhaoyuan, Yantai, Shandong Patentee before: YANTAI ZHIBEN INTELLECTUAL PROPERTY MANAGEMENT Co.,Ltd. |
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