CN109915069A - A kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure and its method for blocking - Google Patents
A kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure and its method for blocking Download PDFInfo
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- CN109915069A CN109915069A CN201910215356.XA CN201910215356A CN109915069A CN 109915069 A CN109915069 A CN 109915069A CN 201910215356 A CN201910215356 A CN 201910215356A CN 109915069 A CN109915069 A CN 109915069A
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003027 oil sand Substances 0.000 title claims abstract description 19
- 230000000903 blocking effect Effects 0.000 title claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 239000002981 blocking agent Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 238000012423 maintenance Methods 0.000 claims abstract description 4
- 238000012797 qualification Methods 0.000 claims abstract description 4
- 239000003431 cross linking reagent Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 238000009533 lab test Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000001879 gelation Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 11
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure and its method for blocking, method for blocking includes the following steps: S1: high temperature plugging structure preparation of construction；S2: just squeezing pipeline Hard link, and pressure testing 10MPa, which is not pierced, not to be leaked, and after 10 minutes qualifications of maintenance, then starts to construct；S3: medical fluid is just squeezed, displacement control is in 0.4-0.6m3/min；S4: after having squeezed profile control agent, clear water is just replaced, clear water is instead replaced, the blocking agent in horizontal wellbore is replaced into clear water；S5: after the completion of construction, Hou Ning 24 hours；The features such as S6: closing P well short tube, is filled the water by P well long tube, judges that the plugging effect high-temperature temporary blocking agent has initial gelation time adjustable at 5MPa, good toughness, resistance to erosion, and has good temperature resistance, simple with liquid, easy for construction.The product and formation fluid have good compatibility, will not pollute to stratum and secondary injury, are widely used in High-temperature Spurting of Steam Injuction Well and temporarily block and alter, improve thermal recovery effect.
Description
Technical field
The present invention relates to weak consolidation oil-sand reservoir capacity-enlargement technology fields, more particularly to a kind of weak consolidation oil-sand reservoir dilatation to use
High temperature plugging structure and its method for blocking.
Background technique
Rock mechanics dilatation refers to pore media rock mass by shear stress or the increased load action of pore fluid pressure
Under, the increased metamorphism of pore volume.At this point, total stress suffered by rock mass may still be compressive stress state.It is weak solid
The dilatation behavior of knot (loose) sandstone can come from shear stress (shear expended volume) or pore pressure increases (Fluid pressure dilatation).From
It is seen on microcosmic, dilatation behavior can be considered as rearranging for sand grains.
The windy city oil field development zone SAGD straticulate exploration is neat G1 layers and G3 layers of the ancient group of Jurassic system, and oil reservoir belongs to typical proluvial
The braided stream deposit under background is fanned, since braided channel diverges merging repeatedly, is influenced by unstable flow action, river is lateral
Rapidly, deposit is complicated, and granularity variation range is wider for migration, and reservoir has a feature of " thin, scattered, broken ", and reservoir sand body is thin, object
The poor and interbed distribution of property is fragmentary.It with the continuous expansion of windy city SAGD exploitation scale, is influenced by reservoir conditions, windy city oil
The SAGD exploitation in field has great difficulty, and it is low to show as horizontal segment development degree in production, vapor chamber expansion rate it is relatively slow and
Develop unbalanced, well group production effect is poor.According to the analysis, it is difficult to act on only with gravity drainage under the conditions of strong heterogeneous reservoir
To obtain preferable development effectiveness, horizontal segment need to be targetedly solved according to the particular problem in reservoir characteristic and production
It effectively employs, vapor chamber accelerates extension, improves percolation ability, reduce permeability grade, producing pressure differential etc. is asked between balanced injection-production well
Topic.
Inventor it has been investigated that, SAGD well is since Reservoir Heterogeneity is serious, permeability grade on interlayer and plane
Steam causes thermal recovery effect poor along macropore (vapor chamber) extension and channeling caused by big, how to invent a kind of weak consolidation oil
The dilatation of sand reservoir is solved these problems with high temperature plugging material and its method for blocking, is become those skilled in the art and is urgently solved
Certainly the problem of.
Summary of the invention
The purpose of the present invention is to provide a kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structures, to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the invention provides the following technical scheme: a kind of weak consolidation oil-sand reservoir dilatation is sealed with high temperature
Bridging structure is provided with plugging material layer, institute including straight well and the bridge plug being arranged in straight well in the straight well more than bridge plug
Stating plugging material layer is high temperature plugging material layer.
Preferably, when the raw material of the plugging material layer is polyacrylamide, the first crosslinking agent, the second crosslinking agent and gel
Between regulator, first crosslinking agent and the second crosslinking agent are organic crosslinking agent, and raw material is as follows by weight: polyacrylamide
0.6-0.8 parts of amine, the first 0.2-0.5 parts of crosslinking agent, the second 0.02-0.08 parts of crosslinking agent, gel time regulator 0.1-0.2
Part.
A kind of weak consolidation oil-sand reservoir dilatation method for blocking, includes the following steps:
S1: high temperature plugging structure preparation of construction:
A. prepare the clear water of sufficient amount by arrangement and method for construction, salinity is less than 500mg/L；
B. there are 20 sides or more with liquid pool 2, one of them will have jet hopper with liquid pool；
C. it is prepared according to laboratory experiment formula；
D. cementing truck 1, several, tank car；
S2: just squeezing pipeline Hard link, and pressure testing 10MPa, which is not pierced, not to be leaked, and after 10 minutes qualifications of maintenance, then starts to construct；
S3: medical fluid is just squeezed, displacement control is in 0.4-0.6m3/min；
S4: after having squeezed profile control agent, clear water is just replaced, clear water is instead replaced, the blocking agent in horizontal wellbore is replaced into clear water；
S5: after the completion of construction, Hou Ning 24 hours；
S6: closing P well short tube, is filled the water by P well long tube, judges plugging effect at 5MPa.
Preferably, for the cementing truck used in the step S1 for 400 types or 700 types, tank car model uses 15,30 or 60 sides
Tank car.
Preferably, the humidity of the step S3 storage environment is no more than 25%, and environment temperature is no more than 60 degrees Celsius.
Preferably, it is met design requirements in the step S6 if blocked, continues to inject sealing agent construction, if blocked
Reach detail design, carries out next step dilatation construction.
One kind weak dilatation of consolidation oil-sand reservoir high temperature plugging structure and its method for blocking provided by the invention, the high temperature are temporary
Blocking agent has initial gelation time adjustable, viscosity height (105mPa.s or more)；Good toughness, resistance to erosion (rock core breakthrough pressure
10MPa/m or more), and there is good temperature resistance (being greater than 200 DEG C, residue is not stayed in the complete aquation degradation of high temperature), it is simple with liquid,
The features such as easy for construction.The product and formation fluid have good compatibility, will not pollute to stratum and secondary injury, extensively
General temporarily block for High-temperature Spurting of Steam Injuction Well is altered, and thermal recovery effect is improved.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of weak consolidation oil-sand reservoir dilatation high temperature plugging structure of the present invention.
In figure: 1- straight well；2- bridge plug；3- plugging material layer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of weak consolidation oil-sand reservoir dilatation high temperature closure knot
Structure is provided with plugging material layer 3 in the straight well 1 of 2 or more the bridge plug including straight well 1 and the bridge plug being arranged in straight well 12,
The plugging material layer 3 is high temperature plugging material layer.
Specifically, the raw material of the plugging material layer 3 is polyacrylamide, the first crosslinking agent, the second crosslinking agent and gel
Time adjustment agent, first crosslinking agent and the second crosslinking agent are organic crosslinking agent, and raw material is as follows by weight: polypropylene
0.6-0.8 parts of amide, the first 0.2-0.5 parts of crosslinking agent, the second 0.02-0.08 parts of crosslinking agent, gel time regulator 0.1-0.2
Part.
A kind of weak consolidation oil-sand reservoir dilatation method for blocking, includes the following steps:
S1: high temperature plugging structure preparation of construction:
A. prepare the clear water of sufficient amount by arrangement and method for construction, salinity is less than 500mg/L；
B. there are 20 sides or more with liquid pool 2, one of them will have jet hopper with liquid pool；
C. it is prepared according to laboratory experiment formula；
D. cementing truck 1, several, tank car；
S2: just squeezing pipeline Hard link, and pressure testing 10MPa, which is not pierced, not to be leaked, and after 10 minutes qualifications of maintenance, then starts to construct；
S3: medical fluid is just squeezed, displacement control is in 0.4-0.6m3/min；
S4: after having squeezed profile control agent, clear water is just replaced, clear water is instead replaced, the blocking agent in horizontal wellbore is replaced into clear water；
S5: after the completion of construction, Hou Ning 24 hours；
S6: closing P well short tube, is filled the water by P well long tube, judges plugging effect at 5MPa.
Specifically, the cementing truck used in the step S1 is 400 types or 700 type, tank car model uses 15,30 or 60 sides
Tank car.
Specifically, the humidity of the step S3 storage environment is no more than 25%, environment temperature is no more than 60 degrees Celsius.
Specifically, meeting design requirements in the step S6 if blocked, continue to inject sealing agent construction, if blocked
Reach detail design, carries out next step dilatation construction.
Sealing agent dosage design, according to construction well connection situation and core intersection, porosity, treatment radius, to
Lower formula calculates:
Q=лhФR2γ
In formula: R- treatment radius/m
H- oil reservoir effective length/m104
Ф-average pore/%
γ-density g/cm3
Q- pharmaceutical quantities/t
Based on practical experience, general profile control treatment radius is 2 ~ 2.5m, and calculating sealing agent dosage according to above-mentioned formula is 3.5m3Often
Rice.Influence of the temperature to gelation time
Table 1
Table 1 is influence table of the temperature to sealing agent gelation time；
Table 2
2 sealing agent heat stabilization test table of table；
After introducing heat stabilizer in polymer, organic crosslinking agent colloid system, entire gel rubber system heatproof is made to be increased to 200 DEG C.
The gel can be very well meet the horizontal well group profile control of SAGD and seal the requirement altered.
It should be understood that high temperature sealing agent preferentially enters channel by blocking steam, steam is made to enter hypotonic area, and wave
And to bigger oil reservoir volume, prevent steam fingering or steam overlap from causing channeling and wasting steam, so as to improve steam efficiency.
Its application principle is as follows:
1. after solution enters high permeability zone, under reservoir conditions, Rapid gelation plays plugging action；
2. under reservoir conditions, as time went on, forming high temperature gel intensity to increase, the plugging effect of enhancing；
3. with the extension of steam injection time, when formation temperature is more than 200 DEG C, gel rubber system gradually aquation, therefore high temperature gel tune
Pollution will not be generated to stratum by cuing open agent.
One kind weak dilatation of consolidation oil-sand reservoir high temperature plugging structure and its method for blocking provided by the invention, the high temperature are temporary
Blocking agent has initial gelation time adjustable, viscosity height (105mPa.s or more)；Good toughness, resistance to erosion (rock core breakthrough pressure
10MPa/m or more), and there is good temperature resistance (being greater than 200 DEG C, residue is not stayed in the complete aquation degradation of high temperature), it is simple with liquid,
The features such as easy for construction.The product and formation fluid have good compatibility, will not pollute to stratum and secondary injury, extensively
General temporarily block for High-temperature Spurting of Steam Injuction Well is altered, and thermal recovery effect is improved.
It should be noted that the temperature requirement of the sealing agent is well Zhou Wendu≤250 DEG C.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure, it is characterised in that: including straight well (1) and be arranged straight
Bridge plug (2) in well (1) is provided with plugging material layer (3) in straight well (1) more than the bridge plug (2), the plugging material layer
It (3) is high temperature plugging material layer.
2. the weak consolidation oil-sand reservoir dilatation high temperature plugging structure of one kind according to claim 1, it is characterised in that: described
The raw material of plugging material layer (3) is polyacrylamide, the first crosslinking agent, the second crosslinking agent and gel time regulator, described the
One crosslinking agent and the second crosslinking agent are organic crosslinking agent, and raw material is as follows by weight: 0.6-0.8 parts of polyacrylamide, the
One 0.2-0.5 parts of crosslinking agent, the second 0.02-0.08 parts of crosslinking agent, 0.1-0.2 parts of gel time regulator.
3. a kind of weak consolidation oil-sand reservoir dilatation method for blocking, characterized by the following steps:
S1: high temperature plugging material preparation of construction:
A. prepare the clear water of sufficient amount by arrangement and method for construction, salinity is less than 500mg/L；
B. there are 20 sides or more with liquid pool 2, one of them will have jet hopper with liquid pool；
C. it is prepared according to laboratory experiment formula；
D. cementing truck 1, several, tank car；
S2: just squeezing pipeline Hard link, and pressure testing 10MPa, which is not pierced, not to be leaked, and after 10 minutes qualifications of maintenance, then starts to construct；
S3: medical fluid is just squeezed, displacement control is in 0.4-0.6m3/min；
S4: after having squeezed profile control agent, clear water is just replaced, clear water is instead replaced, the blocking agent in horizontal wellbore is replaced into clear water；
S5: after the completion of construction, Hou Ning 24 hours；
S6: closing P well short tube, is filled the water by P well long tube, judges plugging effect at 5MPa.
4. the weak consolidation oil-sand reservoir dilatation method for blocking of one kind according to claim 3, it is characterised in that: the step
For the cementing truck used in S1 for 400 types or 700 types, tank car model uses the tank car of 15,30 or 60 sides.
5. the weak consolidation oil-sand reservoir dilatation method for blocking of one kind according to claim 3, it is characterised in that: the step
The humidity of S3 storage environment is no more than 25%, and environment temperature is no more than 60 degrees Celsius.
6. the weak consolidation oil-sand reservoir dilatation method for blocking of one kind according to claim 3, it is characterised in that: the step
It is met design requirements in S6 if blocked, continues to inject sealing agent construction, reach detail design if blocked, carry out in next step
Dilatation construction.
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Cited By (1)
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