CN106194105A - Profile control method is thrown in blocking agent deep - Google Patents
Profile control method is thrown in blocking agent deep Download PDFInfo
- Publication number
- CN106194105A CN106194105A CN201610832339.7A CN201610832339A CN106194105A CN 106194105 A CN106194105 A CN 106194105A CN 201610832339 A CN201610832339 A CN 201610832339A CN 106194105 A CN106194105 A CN 106194105A
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- China
- Prior art keywords
- blocking agent
- control method
- profile control
- liquid
- deep
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
Abstract
The present invention relates to a kind of blocking agent deep and throw in profile control method, it is characterised in that said method comprising the steps of: step 1, at well end, preposition for low leak-off liquid for plugging is injected in stratum, form the man-made fracture of plug at end part；Step 2, uses the man-made fracture formed in liquid-solid mixture filling step 1；Step 3, injects blocking agent, Hou Ning in well, so that blocking agent system solidifies or plastic.The inventive method achieves follow-up blocking agent and is efficiently entering earth formation deep and carries out the purpose that fixed point is thrown in, barometric gradient is effectively protracted, seepage flow mode changes around crack, effectively improves water flooding effectiveness.
Description
Technical field
The present invention relates to a kind of blocking agent deep and throw in profile control method.
Background technology
China started to explore water plugging and profiling technology and study from the fifties in 19th century, developed this skill through decades
The most each elephant of art is applied on a large scale, becomes the effective means of oilfield stimulation stable yields.At present, well profile modification be to
High permeability zone injects blocking agent, adjusts the intake profile of water filling interval, reaches to be subsequently implanted into water and streams the purpose expanding swept volume,
But the major defect of this technology is blocking agent be deposited in 30 meters, near wellbore zone within, follow-up water is easy to breakthrough and streams, and has caused
The effect phase is short, oil increasing precipitation weak effect.Particularly within ultra-high water-containing stage, near wellbore zone 30m remaining oil saturation at 20%-
30%, it is limited that follow-up water streams displacement efficiency.
In order to improve ultra-high water cut stage well profile modification effect, it is necessary for a kind of simple, effective, success rate of constructing
Higher blocking agent deep put-on method, the method allows for effectively blocking agent being placed into beyond 30 meters of well, effectively employs remote
Well area remaining oil, reaches barometric gradient and effectively protracts, improving ecology development effectiveness purpose.Blocking agent deep put-on method master at present
Utilize well of passing by one's way between oil-water well to inject blocking agent and blocking agent slug optimization two kinds of methods of combination, wherein utilize well of passing by one's way to throw in stifled
The method of agent is to inject blocking agent by well of passing by one's way between oil-water well to realize fixed point placement, and implementation process is simple, but real at mining site
Well of passing by one's way when executing is less, it is impossible to realize large-scale application；Blocking agent slug optimization combination depth profile control method is according to waiting pressure drop ladder
Degree method preferred profile control system, high to multistage cock body system performance requirement, and also plug agent amount is big, it is impossible to meet economic requirement, ore deposit
It is big that difficulty is implemented in field.
Therefore, it is still necessary to develop the profile control method thrown in for blocking agent deep.
Summary of the invention
The present invention provides a kind of blocking agent deep to throw in profile control method, it is characterised in that said method comprising the steps of:
Step 1, at well end, injects preposition for low leak-off liquid for plugging in stratum, forms the man-made fracture of plug at end part；
Step 2, uses the man-made fracture formed in liquid-solid mixture filling step 1；
Step 3, injects blocking agent, Hou Ning in well, so that blocking agent system solidifies or plastic.
The method of the present invention includes that expanded support makes seam part and blocking agent input part, and wherein expanded support makes seam part and common pressure break
Difference is that the prepad fluid pumped into is low leak-off liquid for plugging, and its important function is closure crack front, prevents from follow-up taking sand
Liquid and blocking agent are advanced by leaps and bounds along high permeability zone position；Blocking agent input part can utilize the man-made fracture that expanded support goes out, and makes follow-up blocking agent effective
Enter earth formation deep and carry out fixed point input, reach the purpose that barometric gradient is effectively protracted, be effectively improved water flooding effectiveness.
When being embodied as, determine construction target well according to oil reservoir and Developing status, determine according to expanded support length and width and prop up
The consumption of support agent quartz sand；Plug agent amount is determined according to fracture length, core intersection, formation porosity and blocking agent process range,
Utilize profile control device that blocking agent solution is injected stratum after expanded support, reach the purpose of deep profile controlling.
Profile control method applied range is thrown in blocking agent deep of the present invention, and process matched therewith is ripe, and utilize that expanded support produces is artificial
Crack, can make follow-up blocking agent be efficiently entering earth formation deep high permeability zone, has before making blocking agent system effectively before defeated, barometric gradient
Stretch, three big advantages that near wellbore zone seepage flow mode changes, be conducive to improving deep profile controlling quality, be effectively improved waterflooding development effect
Really.
Accompanying drawing explanation
Fig. 1 is the block diagram of the inventive method step；
Fig. 2 is that the expanded support of the present invention makes seam vertical profile schematic diagram；
Fig. 3 is that expanded support of the present invention makes crack vertical profile schematic diagram after seam interpolation proppant；
Fig. 4 is injection blocking agent vertical profile schematic diagram after expanded support；
Fig. 5 is injection blocking agent plane streamline distribution schematic diagram after expanded support；
Fig. 6 is that expanded support makes pressure drop funnel change schematic diagram before and after seam profile control.
In figure, 1 is well；2 is oil well；3 is man-made fracture；4 is the preposition sealing agent of low leak-off；5 proppants；6 is blocking agent.
Detailed description of the invention
The present invention provides a kind of blocking agent deep to throw in profile control method, it is characterised in that said method comprising the steps of:
Step 1, at well end, injects preposition for low leak-off liquid for plugging in stratum, forms the man-made fracture of plug at end part；
Step 2, uses the man-made fracture formed in liquid-solid mixture filling step 1；
Step 3, injects blocking agent, Hou Ning in well, so that blocking agent system solidifies or plastic.
In one embodiment of the invention, profile control method is thrown in described blocking agent deep, it is characterised in that also include step
Rapid 4, after the solidification of blocking agent system or plastic, drive a well the normal water filling of recovery.
In the step 1 of the present invention, a length of more than 30 meters of the man-made fracture formed, preferably 30 to 100 meters, more preferably
35 to 75 meters, particularly preferred 40 to 60 meters；Width is 0.3 to 1 centimetre, preferably 0.3 to 0.8 centimetre；Highly it is 1 to 20 meter, excellent
Select 1 to 15 meter.Described man-made fracture passes through methods known in the art, such as, determined by personal monitoring's method of microseism
Its length, highly, width, and then calculate its volume.
In the step 1 of the present invention, the preposition liquid for plugging of low leak-off is the mixture of high viscous base fluid and inorganic particle, the highest viscous
Base fluid is 2000mg/L-5000mg/L polyacrylamide solution or Xanthan gun solution, and inorganic particle is 40 μm-80 μm cement；Institute
The content stating inorganic particle is 10% to 40 weight %, gross weight meter based on the preposition liquid for plugging of low leak-off.
In the step 1 of the present invention, using fracturing unit truck group, such as rated operating pressure is 70-120MPa, preferably 70MPa
Fracturing unit truck group, injects preposition for low leak-off liquid for plugging in stratum.
In the step 1 of the present invention, the discharge capacity injecting the described preposition liquid for plugging of low leak-off is 3m3/min-6m3/ min, it makes
Man-made fracture front end is closed.Described front end refer to the man-made fracture of the formation along low leak-off preposition liquid for plugging injection direction before
End face.
In the step 2 of the present invention, described liquid-solid mixture is the mixture of highly viscous sand-laden fluid and proppant, and the highest gluing is taken
Sand liquid be concentration be 2000mg/L-5000mg/L polyacrylamide solution or Xanthan gun solution；Proppant be particle diameter be 0.4mm-
The inorganic particle of 0.8mm, the preferred quartz sand of described inorganic particle；The content of described proppant is 10% to 40 weight %, based on
The gross weight meter of liquid-solid mixture.
In the step 3 of the present invention, blocking agent is discontinuous phase particulate species blocking agent or continuous phase gelled plugging agent；Discontinuous phase
Grain class blocking agent such as concentration is the superfine cement of 10%-15%, continuous phase gelled plugging agent for example, 3000-5000mg/L poly-third
Acrylamide and the mixture of 3000-5000mg/L phenolic crosslinkers equal proportion.
In the step 3 of the present invention, the injection mode of blocking agent is general injection.The injection of blocking agent uses side well known in the art
Method is carried out.
In the step 3 of the present invention, the plug agent amount of injection is calculated by formula (1):
Q=4/3 π abL Φ (1)
In formula, Q is plug agent amount, m3；A is the vertical degree of depth of ellipsoid radial section, m；B is the level of ellipsoid radial section
Radius, m；L is the length that blocking agent is distributed in both sides, man-made fracture end, m；Φ is formation porosity, %.
In one embodiment of the invention, the method for the present invention is carried out as follows:
Step 1, at well end, utilizes fracturing unit truck group that preposition for low leak-off liquid for plugging high pump pressure huge discharge is just being clamp-oned stratum
In, form the man-made fracture of 30 meters of-100 meters of plug at end part in the earth formation, prevent follow-up load fluid and blocking agent along Thief zone position
Advance by leaps and bounds；
Step 2, then use concentration be 2000mg/L-5000mg/L polyacrylamide solution or Xanthan gun solution contour viscous
Liquid, as load fluid, suspends and carries the quartz sand of 0.4mm-0.8mm as proppant, filling man-made fracture；
Step 3, in well, general implantation concentration is the discontinuous phase particulate species blocking agents such as the superfine cement of 10%～15%
Or the continuous phase gelled plugging agent such as 3000-5000mg/L polyacrylamide and 3000-5000mg/L phenolic crosslinkers, blocking agent is being split
Seam both sides are efficiently entering Thief zone position, and after having noted blocking agent, in well, the blocking agent in pit shaft and crack is replaced ground by injected clear water
In Ceng, the consumption of injected clear water is hole volume and crevice volume sum, has replaced rear closing well 3-5 days, it is ensured that blocking agent system is solid
Change or plastic；
Step 4, after the solidification of blocking agent system or plastic, drive a well the normal water filling of recovery, injects water in crack to both sides, crack
Stratum filtration, forms linear flow, produces at profile control closure position and streams, thus reaches expand injection ripples and and change ground layer depth
The effect of portion's barometric gradient, plays the effect of oil increasing precipitation.
In the present invention, unless otherwise indicated, the most all numbers or percent are weight portion or percetage by weight.
In the present invention, material used is known substance, commercially available or synthesized by known method.
In the present invention, equipment therefor or equipment are conventional equipment or equipment known to described field, commercially available.
Illustrate the present invention below in conjunction with embodiment, but the present invention is not limited to following example.
Embodiment
Advance by leaps and bounds along high permeability zone position cause oil well 2 ultra-high water-containing as in figure 2 it is shown, well 1 injects water, and pass through around well
The oil saturation that washes away for many years is less than 30%, and waterflood efficiency is extremely low, as being not for Thief zone position indepth plugging, then affects oil
The development effectiveness of well and economic life time.Well 1 design parameter: perforated interval 1248m-1263m, perforation layer thickness 15m, infiltration
Rate 2300 × 10-3μm2, porosity 31.6%, water injection pressure 8.0MPa, daily water-injection rate 150m3/ d, corresponding oil well 2 comprehensive water cut
96.4%.
As shown in Figures 2 to 6, Specific construction step is as follows:
In step 1, utilize fracturing unit truck group that the polyacrylamide solution that concentration is 3000mg/L carries particle diameter 50 μm cement
As the preposition liquid for plugging of low leak-off, arranging fracturing unit truck group discharge capacity in injection process is 4m3/ min, injection mode, for just to note, is formed
The artificial expanded support crack of plug at end part, then determines a length of of man-made fracture by microseism personal monitoring's method in the earth formation
45m, highly 15m, width 0.8cm, determine that the amount filling load fluid is 5.4m3。
In step 2, then using 4000mg/L polyacrylamide solution load fluid, suspension is carried the quartz sand of 0.6mm and is filled
Fill out man-made fracture, make crack have high flow conductivity.
In step 3,400 type profile control pumps are utilized to inject 4000mg/L polyacrylamide and 4000mg/L phenol in man-made fracture
The mixed solution 3600m of aldehyde cross-linking agent3, blocking agent is efficiently entering high permeability zone in both sides, crack, reaches the mesh that location, deep envelope is altered
, after injecting blocking agent, the blocking agent in pit shaft and crack is replaced to stratum, closing well Hou Ning 3 days, it is ensured that blocking agent system plastic.Blocking agent
Consumption is according to formula (1) approximate calculation:
Q=4/3 π abL Φ (1)
In formula, a is the vertical degree of depth of ellipsoid radial section, and i.e. the height of man-made fracture, takes 15m；B is ellipsoid radial section
Horizontal radius, increase for making to be subsequently implanted into water swept volume, take 20m；L is the length that blocking agent is distributed in both sides, man-made fracture end
Degree, in the range of proving that blocking agent is distributed in the 1/5 of fracture tip by indoor logistics organizations, takes 9m；Φ is formation porosity, takes
31.6%.
In step 4, after blocking agent Hou Ning terminates, drive a well the normal water filling of recovery, injects water in crack and near both sides, crack
Form linear flow in stratum, produce at profile control closure position and stream, thus reach to expand the effect involving and changing barometric gradient.
After measure is implemented, oil well 2 is aqueous minimum is down to 89.6%, accumulative increases oil more than 5000 tons, and effect duration reaches 18 months, rises
Effect to decreasing water cut and increasing oil..
Claims (10)
1. profile control method is thrown in a blocking agent deep, it is characterised in that said method comprising the steps of:
Step 1, at well end, injects preposition for low leak-off liquid for plugging in stratum, forms the man-made fracture of plug at end part；
Step 2, uses the man-made fracture formed in liquid-solid mixture filling step 1；
Step 3, injects blocking agent, Hou Ning in well, so that blocking agent system solidifies or plastic.
2. claim 1 blocking agent deep throw in profile control method, it is characterised in that also include step 4, blocking agent system solidification or
After plastic, drive a well the normal water filling of recovery.
3. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that in step 1, the man-made fracture formed
A length of more than 30 meters, preferably 30 to 100 meters, more preferably 35 to 75 meters, particularly preferred 40 to 60 meters；Width is 0.3 to 1 li
Rice, preferably 0.3 to 0.8 centimetre；Highly it is 1 to 20 meter, preferably 1 to 15 meter.
4. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that the liquid-solid mixture in step 2 is high viscous
Load fluid and the mixture of proppant, wherein highly viscous sand-laden fluid be concentration be 2000mg/L-5000mg/L polyacrylamide solution
Or Xanthan gun solution；Proppant be particle diameter be the inorganic particle of 0.4mm-0.8mm, the preferred quartz sand of described inorganic particle；Described
The content of proppant is 10% to 40 weight %, gross weight meter based on liquid-solid mixture.
5. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that the blocking agent in step 3 is discontinuous phase
Grain class blocking agent or continuous phase gelled plugging agent；Discontinuous phase particulate species blocking agent for example, concentration is the superfine cement of 10%-15%,
Continuous phase gelled plugging agent for example, 3000-5000mg/L polyacrylamide and 3000-5000mg/L phenolic crosslinkers equal proportion
Mixture.
6. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that in step 1, the preposition liquid for plugging of low leak-off is
High viscous base fluid and the mixture of inorganic particle, the highest viscous base fluid is 2000mg/L-5000mg/L polyacrylamide solution or Huang
Born of the same parents' sol solution, inorganic particle is 40 μm-80 μm cement；The content of described inorganic particle is 10% to 40 weight %, based on low filter
Lose the gross weight meter of preposition liquid for plugging.
7. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that in step 1, uses fracturing unit truck group, such as
Rated operating pressure is the fracturing unit truck group of 70-120MPa, is injected in stratum by preposition for low leak-off liquid for plugging.
8. profile control method is thrown in the blocking agent deep of claim 1 or 2, it is characterised in that in step 1, inject described low leak-off preposition
The discharge capacity of liquid for plugging is 3m3/min-6m3/ min, and man-made fracture front end is closed.
9. throw in profile control method according to the blocking agent deep of claim 1 or 2, it is characterised in that in step 3, the injection of blocking agent
Mode is general injection.
10. throw in profile control method according to the blocking agent deep of claim 1 or 2, it is characterised in that in step 3, the blocking agent of injection
Consumption is calculated by formula (1):
Q=4/3 π abL Φ (1)
In formula, Q is plug agent amount, m3；A is the vertical degree of depth of ellipsoid radial section, m；B is the horizontal radius of ellipsoid radial section,
m；L is the length that blocking agent is distributed in both sides, man-made fracture end, m；Φ is formation porosity, %.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107725038A (en) * | 2017-09-12 | 2018-02-23 | 中国石油天然气股份有限公司 | It is a kind of to test seal-off effect chemical profile control agent and migrated in oil reservoir the method for depth |
| CN108643856A (en) * | 2018-03-15 | 2018-10-12 | 中国石油大学(华东) | A kind of radial well guiding blocking agent injection oilwell water shutoff method |
| CN109826590A (en) * | 2019-02-27 | 2019-05-31 | 杨凌单色生物科技有限公司 | A kind of old well water blockoff fracturing process of hypotonic oil gas field High water cut |
| CN112360393A (en) * | 2020-10-29 | 2021-02-12 | 中国石油化工股份有限公司 | Profile control process for improving profile control effectiveness of waste drilling mud |
| CN114961631A (en) * | 2021-02-24 | 2022-08-30 | 中国石油化工股份有限公司 | Composite water plugging method for jelly |
| CN115434659A (en) * | 2021-06-02 | 2022-12-06 | 中国石油天然气集团有限公司 | Process method for deep fixed-point feeding of blocking agent for high-permeability reservoir |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725038A (en) * | 2017-09-12 | 2018-02-23 | 中国石油天然气股份有限公司 | It is a kind of to test seal-off effect chemical profile control agent and migrated in oil reservoir the method for depth |
| CN108643856A (en) * | 2018-03-15 | 2018-10-12 | 中国石油大学(华东) | A kind of radial well guiding blocking agent injection oilwell water shutoff method |
| CN108643856B (en) * | 2018-03-15 | 2020-06-02 | 中国石油大学(华东) | Water plugging method for oil well by injecting plugging agent into radial well |
| CN109826590A (en) * | 2019-02-27 | 2019-05-31 | 杨凌单色生物科技有限公司 | A kind of old well water blockoff fracturing process of hypotonic oil gas field High water cut |
| CN109826590B (en) * | 2019-02-27 | 2021-05-14 | 杨凌单色生物科技有限公司 | Water plugging and fracturing method for high-water-content old well in low-permeability oil and gas field |
| CN112360393A (en) * | 2020-10-29 | 2021-02-12 | 中国石油化工股份有限公司 | Profile control process for improving profile control effectiveness of waste drilling mud |
| CN114961631A (en) * | 2021-02-24 | 2022-08-30 | 中国石油化工股份有限公司 | Composite water plugging method for jelly |
| CN115434659A (en) * | 2021-06-02 | 2022-12-06 | 中国石油天然气集团有限公司 | Process method for deep fixed-point feeding of blocking agent for high-permeability reservoir |
| CN115434659B (en) * | 2021-06-02 | 2024-03-01 | 中国石油天然气集团有限公司 | Technological method for deep fixed-point delivery of hypertonic reservoir plugging agent |
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