CN110529092A - A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool - Google Patents
A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool Download PDFInfo
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- 230000035699 permeability Effects 0.000 title claims abstract description 31
- 230000000903 blocking effect Effects 0.000 title abstract description 20
- 230000020477 pH reduction Effects 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 238000009792 diffusion process Methods 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims description 29
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 18
- 230000000295 complement effect Effects 0.000 claims description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 230000010354 integration Effects 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 4
- 150000003871 sulfonates Chemical class 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 2
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- -1 iron ion Chemical class 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 239000013589 supplement Substances 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 11
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 101000766116 Haloarcula vallismortis Cruxrhodopsin-3 Proteins 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000009096 changqing Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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Abstract
The invention belongs to oilfield horizontal well subsection acidizing technical fields, horizontal well in segments acidization tool is blocked more particularly to a kind of Oil in Super-low Permeability oil reservoir low pressure, this method is directed to 5 points or 7 areal well patterns of Oil in Super-low Permeability reservoir horizontal well, strata pressure keeps the horizontal blocking horizontal well less than 80%, tubing string is acidified using multistage sliding sleeve, pass through K344 packer, sliding sleeve injector, the combination such as sliding sleeve tee, realize the construction of horizontal well fixed tubular column subsection acidizing, while subsection acidizing, stratum energy is supplemented to no corresponding water injection well interval injection displacement of reservoir oil fracturing fluid, closing well diffusion open flow backwash after 1-2 days after acidification, it reproduces.Horizontal well in segments acidification and supplement energy are integrated, the purpose of same layer displacement is realized, further increases horizontal well in segments acidizing effect.
Description
Technical field
The invention belongs to oilfield horizontal well subsection acidizing technical fields, and in particular to a kind of Oil in Super-low Permeability oil reservoir low pressure blocking water
Horizontal well subsection acidizing method.
Background technique
Changqing oilfields extra-low-permeability reservoir matrix permeability low (< 1.0 × 10-3um2), reservoir pressure coefficient is low (< 0.8),
Horizontal well is in Oil in Super-low Permeability block sizable application, and initial stage transformation carries out staged fracturing, with the extension of horizontal well development time, part
Horizontal well low yield is as caused by reservoir fouling.Early period is significantly low for blocking feature in Changqing oilfields ultra-low penetration block
Produce the subsection acidizing that horizontal well is implemented, produce that liquid decline is very fast, short validity period is 3-4 months after the well measure of part daily, mainly by
Keep horizontal less than 80% in part well strata pressure, although relieving the dirt of horizontal well blocking interval using subsection acidizing,
Since 5 points or 7 repeating pattern floods of horizontal well are difficult to set up effective displacement system, stratum energy is gradually reduced, and causes to arrange
Produce liquid decline after applying daily comparatively fast, validity period is short.Therefore it needs for blocking horizontal well of the strata pressure holding level less than 80%,
Carry out a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool research.
Summary of the invention
In view of the above-mentioned problems existing in the prior art, the present invention provides a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal wells point
Section acidization tool, this method are acidified tubing string using multistage sliding sleeve, pass through the groups such as K344 packer, sliding sleeve injector, sliding sleeve tee
It closes, realizes the construction of horizontal well fixed tubular column subsection acidizing, while subsection acidizing, no corresponding water injection well interval injection is driven
Oily fracturing fluid supplements stratum energy, and horizontal well in segments acidification and supplement energy are integrated, the purpose of same layer displacement is realized, into one
Walk well subsection acidizing effect of improving the standard.
Technical solution of the present invention is as follows:
A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, comprising the following steps:
S1. according to the reservoir characteristic of Oil in Super-low Permeability oil reservoir, horizontal well patterns type, specially 5 areal well patterns or 7 faces are selected
Product well pattern；
S2. the horizontal well pattern according to selected by step S1 designs multistage sliding sleeve and is acidified tubular column structure, then connects multistage sliding sleeve
It is acidified tubing string, the multistage sliding sleeve connected is acidified in tubing string tripping in horizontal well pit shaft to design position；
S3. the horizontal well pattern according to selected by step S1 designs corresponding acidizing treatment interval number, and disposes each interval
Operation mode；
S4. the operation mode according to designed by step S3 successively carries out acidizing treatment or acidification plus complementary energy joint to corresponding interval
Operation；
S5. after the acidizing treatment operation for completing all intervals, the acid solution in oil pipe is headed into stratum, closing well diffusion 1- with active water
2 days；
S6. open flow backwash pit shaft.
In the step S2, multistage sliding sleeve acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, spray
Emitter, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, two
Grade K344 packer, second level sliding sleeve injector, n grades of sleeve bases of second level chamfer tool oil pipe ..., n grades of K344 packers, n grades of cunnings
Cover injector, n grades of chamfer tool oil pipes, n grades of K344 packers, n grades of chamfer tool oil pipes and tool oil pipe.
In the step S2, when selected horizontal well pattern is 5 areal well patterns, the multistage of 5 areal well patterns is sliding
Set acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packing
Device, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector,
Second level chamfer tool oil pipe, three-level sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, four
Grade K344 packer, level Four chamfer tool oil pipe and tool oil pipe；
When selected horizontal well pattern is 7 areal well patterns, the multistage sliding sleeve acidification tubing string of 7 areal well patterns includes artesian well
Bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector,
Level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfer tool oil pipe, three
Grade sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four sleeve base, level Four K344 envelope
Every device, level Four sliding sleeve injector, level Four chamfer tool oil pipe, Pyatyi K344 packer, Pyatyi chamfer tool oil pipe and tool oil
Pipe.
In the step S3, when selected horizontal well pattern is 5 areal well patterns, the acidification of 5 areal well patterns is applied
The design of work interval number has 4 sections, wherein 1,4 section of progress acidizing treatment, 2,3 sections carry out acidification plus complementary energy integration of operation；Selected level
When well well pattern form is 7 areal well patterns, the acidizing treatment interval number design of 7 areal well patterns has 5 sections, wherein 2,4 sections into
Row acidification plus complementary energy integration of operation, 1,3,5 section of progress acidizing treatment.
In the step S4, acid solution used in acidizing treatment is buffer regulated HF acid, and pump fluence is 30-40 m3, discharge capacity 1.0-
2.0 m3/ min, liquid used in complementary energy operation are displacement of reservoir oil fracturing fluid, and pump fluence is 500-1000 m3, discharge capacity is 1.0-2.0 m3/
min。
The buffer regulated HF acid is grouped as by the group of following weight percent: technical hydrochloric acid 10-15%, hydrofluoric acid 1.5-3%, second
Sour 1.0-3.0%, ferrous stability 0.4-0.6%, salt acid inhibitor 0.5-1.5%, cleanup additive 0.5-1.5%, surplus are water；
Wherein, the mass percentage concentration of the technical hydrochloric acid is 31%, and the mass percentage concentration of hydrofluoric acid is 40%；The iron ion
Stabilizer is one of acetic acid, citric acid, disodium edta.
The displacement of reservoir oil type fracturing fluid is grouped as by the group of following weight percent: Sulfonates washing oil surfactant 0.1-
0.5%, KCl0.5-1.5%, surplus are water.
The active water is grouped as by the group of following weight percent: cleanup additive 0.2-0.8%, clay stabilizer 0.2-
0.8%, surplus is water.
The pump note discharge capacity of active water is 1-2.0m in the step S53/min。
Closing well diffusion, which refers to, in the step S5 forces diffusion strata pressure, pressure after closing well 1-2 days by wellhead shut-in
When derivative is close to 0, fluid flow state switchs to stratum linear flow or radial flow by crack linear flow, and matrix filtrational resistance increases, this
When can terminate closing well.
The invention has the advantages that
1, tubing string is acidified by multistage sliding sleeve, realizes that acidification, complementary energy, stewing well one plow brill, does not need open flow halfway, quickly environmental protection；
2, according to horizontal well patterns, stratum energy is supplemented by injecting displacement of reservoir oil fracturing fluid to no corresponding water injection well interval, it is other
The subsection acidizing transformation of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well is realized in interval acidification；
3, dragging oil pipe is not needed, in the case where fixed tubular column, only need to put into steel ball, to each section of progress subsection acidizing measure,
Easy for construction simple and direct, the period is short.
Specific embodiment
Embodiment 1
A kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, comprising the following steps:
S1. according to the reservoir characteristic of Oil in Super-low Permeability oil reservoir, horizontal well patterns type, specially 5 areal well patterns or 7 faces are selected
Product well pattern；
S2. the horizontal well pattern according to selected by step S1 designs multistage sliding sleeve and is acidified tubular column structure, then connects multistage sliding sleeve
It is acidified tubing string, the multistage sliding sleeve connected is acidified in tubing string tripping in horizontal well pit shaft to design position；
S3. the horizontal well pattern according to selected by step S1 designs corresponding acidizing treatment interval number, and disposes each interval
Operation mode；
S4. acidizing treatment or acidification plus complementary energy integration of operation successively are carried out to corresponding interval；
S5. after the acidizing treatment operation for completing all intervals, the acid solution in oil pipe is headed into stratum, closing well diffusion 1- with active water
2 days；
S6. open flow backwash pit shaft.
This method is directed to 5 points or 7 areal well patterns of horizontal well, and strata pressure keeps the horizontal blocking less than 80% horizontal
Well is acidified tubing string using multistage sliding sleeve, and sliding sleeve is opened in pitching step by step in the case where fixed tubular column, successively realizes each section of acidification
Construction, while subsection acidizing, the interval injection displacement of reservoir oil fracturing fluid low to stratum energy supplements stratum energy, by horizontal well point
Section acidification and supplement energy integration construction, realize purpose of the complementary energy interval to the non-complementary energy interval displacement of reservoir oil.
Embodiment 2
On the basis of embodiment 1, in the step S2, multistage sliding sleeve acidification tubing string includes sequentially connecting from shaft bottom to well head direction
The ball-and-seat that connects, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one chamfer tool oil pipe,
Second level sleeve base, second level K344 packer, second level sliding sleeve injector, n grades of sleeve bases of second level chamfer tool oil pipe ..., n grades
K344 packer, n grades of sliding sleeve injectors, n grades of chamfer tool oil pipes, n grades of K344 packers, n grades of chamfer tool oil pipes and tool
Oil pipe.
Further, the multistage sliding sleeve acidification tubing string of 5 areal well patterns includes sequentially connected from shaft bottom to well head direction
Ball-and-seat, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one Φ 73mm chamfer tool oil
Pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level Φ 73mm chamfer tool oil pipe, three-level sliding sleeve
Seat, three-level K344 packer, three-level sliding sleeve injector, three-level Φ 73mm chamfer tool oil pipe, level Four K344 packer, level Four
Φ 73mm chamfer tool oil pipe and Φ 73mm general tool oil pipe；The multistage sliding sleeve acidification tubing string of 7 areal well patterns includes artesian well
Bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector,
Level-one Φ 73mm chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level Φ 73mm fall
Angle tool oil pipe, three-level sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level Φ 73mm chamfer tool oil pipe, four
Grade sleeve base, level Four K344 packer, level Four sliding sleeve injector, level Four Φ 73mm chamfer tool oil pipe, Pyatyi K344 packer
, Pyatyi Φ 73mm chamfer tool oil pipe and Φ 73mm general tool oil pipe.
Dragging oil pipe is not needed, in the case where fixed tubular column, only steel ball need to be put into, to each section of progress subsection acidizing operation
Measure, easy for construction simple and direct, the period is short.
Embodiment 3
On the basis of embodiment 1, further, in the step S3, selected horizontal well pattern is 5 areal well patterns
When, the acidizing treatment interval number design of 5 areal well patterns has 4 sections, wherein 1,4 section of progress acidizing treatment, 2,3 sections are acidified
Add complementary energy integration of operation；When selected horizontal well pattern is 7 areal well patterns, the acidizing treatment interval of 7 areal well patterns
Number design has 5 sections, wherein 2,4 sections carry out acidification plus complementary energy integration of operation, 1,3,5 section of progress acidizing treatment.
Further, acid solution used in acidizing treatment is buffer regulated HF acid, and pump fluence is 30-40 m3, discharge capacity is 1.0-2.0 m3/
Min, liquid used in complementary energy operation are displacement of reservoir oil fracturing fluid, and pump fluence is 500-1000 m3, discharge capacity is 1.0-2.0 m3/min.Into one
Step ground, the buffer regulated HF acid are grouped as by the group of following weight percent: technical hydrochloric acid 10-15%, hydrofluoric acid 1.5-3%, acetic acid
1.0-3.0%, ferrous stability 0.4-0.6%, salt acid inhibitor 0.5-1.5%, cleanup additive 0.5-1.5%, surplus are water；Its
In, the mass percentage concentration of the technical hydrochloric acid is 31%, and the mass percentage concentration of hydrofluoric acid is 40%；The ferrous stability
For one of acetic acid, citric acid, EDTA.
Preferably, the buffer regulated HF acid includes the component of following weight percent: technical hydrochloric acid 12%, hydrofluoric acid 1.5-3%,
Acetic acid 2.0%, ferrous stability EDTA0.5%, salt acid inhibitor 1.0%, cleanup additive 1.0%, surplus are water.The hydrochloric acid is slow
The salt acid inhibitor MH-36 of agent preferred Chang Qing Chemical Group Co., Ltd production is lost, the preferably long celebrating Chemical Group of cleanup additive is limited
The cleanup additive PZ-200 of company's production.The purpose of pump note organic acid is to release in stratum to block inorganic scale, to restore horizontal well
Production capacity.
Embodiment 4
Further, the displacement of reservoir oil type fracturing fluid is grouped as by the group of following weight percent: Sulfonates washing oil surface-active
Agent 0.1-0.5%, KCl0.5-1.5%, surplus are water.Preferably, the displacement of reservoir oil type fracturing fluid includes the group of following weight percent
Point: 0.3% Sulfonates washing oil surfactant EOS-3,1% KCl, surplus are water.
Further, in the step S5, the pump note discharge capacity of the active water is 1-2.0m3/min.The active water by
The group of following weight percent is grouped as: cleanup additive 0.2-0.8%, clay stabilizer 0.2-0.8%, surplus are water.Cleanup additive CF-
5D, clay stabilizer COP-3 are Chang Qing Chemical Group Co., Ltd product, others can also be selected to help row according to reservoir properties
Agent, clay stabilizer.
Preferably, the active water includes the component of following weight percent: cleanup additive CF-5D0.5%, clay stabilizer
COP-30.5%, surplus are water；Cleanup additive CF-5D, clay stabilizer COP-3 and water need to only be mixed by formula ratio when preparation.
Further, closing well diffusion refers to through wellhead shut-in pressure diffusion strata pressure, closing well 1-2 in the step S5
When pressure derivative is close to 0 after it, fluid flow state switchs to stratum linear flow or radial flow, matrix filtrational resistance by crack linear flow
Increase, closing well can be terminated at this time.
Embodiment 5
Present embodiments provide a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, comprising the following steps:
S1. 5 areal well patterns of horizontal well and first 8 sections of transformation design a double envelope drawing type drilling tool (i.e. multistage sliding sleeve acidification
Tubing string) 4 sections of construction, 2 perforated intervals of every section of acidification, 2,3 sections carry out acidification plus complementary energy construction, 1,4 section of acidizing treatment；
Wherein, the structure of the multistage sliding sleeve acidification tubing string of 5 areal well patterns is (from shaft bottom to well head direction): ball-and-seat+
Injector (first segment)+level-one sleeve base+level-one K344 packer+level-one sliding sleeve injector (second segment)+level-one Φ 73mm falls
Angle tool oil pipe+second level sleeve base+second level K344 packer+second level sliding sleeve injector (third section)+second level Φ 73mm chamfering work
Has oil pipe+three-level sleeve base+three-level K344 packer+three-level sliding sleeve injector (the 4th section)+three-level Φ 73mm chamfer tool oil
Pipe+level Four K344 packer+level Four Φ 73mm chamfer tool oil pipe (the above 20m of kickoff point (KOP))+Φ 73mm general tool oil pipe；
S2. horizontal well in segments acidizing treatment first segment, in 0.5m3It is low for circulation pit shaft, discharge capacity with active water under the discharge capacity of/min
It is promoted to level-one packer setting, then uses 1.0-2.0 m3/ min discharge capacity, pump fluence are 30-40 m3Buffer regulated HF acid is completed
Acidizing treatment first segment；
S3. it throws level-one ball and makes level-one sliding sleeve injector, carry out second segment acidizing treatment；
S4. it is pumped into 30-40m3After buffer regulated HF acid, it is then poured into displacement of reservoir oil type fracturing fluid 500-1000m3, supplement the stratum of the interval
Energy completes second segment acidizing treatment；
S5. it throws second level ball and makes second level sliding sleeve injector, carry out third section acidizing treatment；
S6. it is pumped into 30-40m3After buffer regulated HF acid, it is then poured into displacement of reservoir oil type fracturing fluid 500-1000m3, supplement the stratum of the interval
Energy completes third section acidizing treatment；
S7. it throws three-level ball and makes three-level sliding sleeve injector, carry out the 4th section of acidizing treatment；
S8. it is pumped into 30-40 m3Buffer regulated HF acid, the 4th section of acidizing treatment；
S9. using active water in 1.0-2.0 m3Under the discharge capacity of/min, the acid solution in downhole tool is headed into stratum, closing well diffusion
1-2 days；
S10. open flow backwash pit shaft.
In conclusion present embodiments providing a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, the party
Method is directed to 5 areal well patterns of Oil in Super-low Permeability reservoir horizontal well, and strata pressure keeps the horizontal blocking horizontal well less than 80%, using more
Grade sliding sleeve is acidified tubing string, is combined by K344 packer, sliding sleeve injector, sliding sleeve tee etc., realizes horizontal well fixed tubular column point
Section acidizing treatment supplements stratum energy to the no corresponding water injection well interval injection displacement of reservoir oil fracturing fluid while subsection acidizing, will
Horizontal well in segments acidification is integrated with supplement energy.
It goes into operation at present 2 mouthfuls of wells (the flat 52-10 in river, the flat 52-12 in river) using the technique, May 18 went into operation, at present average daily output
Liquid 28.88m3, day oil-producing 14.6t, aqueous 40.1%；1 mouthful of well of bored well (the flat 52-11 in river), construction on May 10 are completed, May 16
Bored well, well head pressure 4.4MPa at present, measure effect is as shown in table 1 below after pressure,
Parametric statistics table is transformed in 1 horizontal well refracturing of table
Embodiment 6
Present embodiments provide a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, comprising the following steps:
7 areal well patterns of step 1) horizontal well and first 10 sections of transformation design a double envelope drawing type drilling tool (i.e. multistage sliding sleeve
It is acidified tubing string) 5 sections of construction, 2 perforated intervals of every section of acidification, 2,4 sections carry out acidification plus complementary energy construction, 1,3,5 section of acidizing treatment；
The structure of the multistage sliding sleeve acidification tubing string are as follows: (from shaft bottom to well head direction): ball-and-seat+injector (first segment)+one
Grade sleeve base+level-one K344 packer+level-one sliding sleeve injector (second segment)+level-one Φ 73mm chamfer tool oil pipe+second level is sliding
Block set+second level K344 packer+second level sliding sleeve injector (third section)+second level Φ 73mm chamfer tool oil pipe+three-level sleeve base
+ three-level K344 packer+three-level sliding sleeve injector (the 4th section)+three-level Φ 73mm chamfer tool oil pipe+level Four sleeve base+four
Grade K344 packer+level Four sliding sleeve injector (the 5th section)+level Four Φ 73mm chamfer tool oil pipe+Pyatyi K344 packer+five
Grade Φ 73mm chamfer tool oil pipe (the above 20m of kickoff point (KOP))+Φ 73mm general tool oil pipe is to well head；
Step 2 horizontal well in segments acidizing treatment first segment, it is low for after setting, it is pumped into 30-40 m3Buffer regulated HF acid, acidizing treatment
One section；
Step 3) throws level-one ball and makes level-one sliding sleeve injector, carries out second segment acidizing treatment；
Step 4) is pumped into 30-40 m3After buffer regulated HF acid, it is then poured into displacement of reservoir oil type fracturing fluid 500-1000m3, supplement the interval
Stratum energy completes second segment acidizing treatment；
Step 5) throws second level ball and makes second level sliding sleeve injector, carries out third section acidizing treatment；
Step 6) is pumped into 30-40 m3Buffer regulated HF acid, acidizing treatment third section；
Step 7) throws three-level ball and makes three-level sliding sleeve injector, carries out the 4th section of acidizing treatment；
Step 8) is pumped into 30-40 m3After buffer regulated HF acid, it is then poured into displacement of reservoir oil type fracturing fluid 500-1000m3, supplement the interval
Stratum energy completes the 4th section of acidizing treatment；
Step 9) throws level Four ball and makes level Four sliding sleeve injector, carries out the 5th section of acidizing treatment；
Step 10) is pumped into 30-40 m3Buffer regulated HF acid, the 5th section of acidizing treatment；
Step 11) is using active water in 1-2.0 m3Under the discharge capacity of/min, the acid solution in downhole tool is headed into stratum, closing well expands
Pressure 1-2 days；
Step 12) open flow backwash pit shaft.
In conclusion present embodiments providing a kind of Oil in Super-low Permeability oil reservoir low pressure blocking horizontal well in segments acidization tool, the party
Method is directed to 7 areal well patterns of Oil in Super-low Permeability reservoir horizontal well, and strata pressure keeps the horizontal blocking horizontal well less than 80%, using more
Grade sliding sleeve is acidified tubing string, is combined by K344 packer, sliding sleeve injector, sliding sleeve tee etc., realizes horizontal well fixed tubular column point
Section acidizing treatment supplements stratum energy to the no corresponding water injection well interval injection displacement of reservoir oil fracturing fluid while subsection acidizing, will
Horizontal well in segments acidification is integrated with supplement energy, and measure effect after low pressure blocking horizontal well in segments acidification is made after the process implementing
It is increased to 12 months or more, effect of increasing production is good.
The part that above embodiments do not specifically describe belongs to the well-known components and common structure or normal of the art
With means, no longer it is described in detail one by one herein.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
It is within being all belonged to the scope of protection of the present invention with the same or similar design of the present invention.
Claims (10)
1. a kind of Oil in Super-low Permeability oil reservoir low pressure blocks horizontal well in segments acidization tool, which comprises the following steps:
S1. according to the reservoir characteristic of Oil in Super-low Permeability oil reservoir, horizontal well patterns type, specially 5 areal well patterns or 7 faces are selected
Product well pattern；
S2. the horizontal well pattern according to selected by step S1 designs multistage sliding sleeve and is acidified tubular column structure, then connects multistage sliding sleeve
It is acidified tubing string, the multistage sliding sleeve connected is acidified in tubing string tripping in horizontal well pit shaft to design position；
S3. the horizontal well pattern according to selected by step S1 designs corresponding acidizing treatment interval number, and disposes each interval
Operation mode；
S4. according to the operation mode of the step S3 each interval disposed, acidizing treatment or acidification successively are carried out to corresponding interval
Add complementary energy integration of operation；
S5. after the acidizing treatment operation for completing all intervals, the acid solution in oil pipe is headed into stratum, closing well diffusion 1- with active water
2 days；
S6. open flow backwash pit shaft.
2. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that:
In the step S2, multistage sliding sleeve acidification tubing string includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one
Sleeve base, level-one K344 packer, level-one sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packing
Device, second level sliding sleeve injector, n grades of sleeve bases of second level chamfer tool oil pipe ..., n grades of K344 packers, n grades of sliding sleeve injectors, n
Grade chamfer tool oil pipe, n grades of K344 packers, n grades of chamfer tool oil pipes and tool oil pipe.
3. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that:
In the step S2, when selected horizontal well pattern is 5 areal well patterns, the multistage sliding sleeve of 5 areal well patterns is acidified pipe
Column includes from shaft bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one
Sliding sleeve injector, level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfering
Tool oil pipe, three-level sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four K344 envelope
Every device, level Four chamfer tool oil pipe and tool oil pipe；
When selected horizontal well pattern is 7 areal well patterns, the multistage sliding sleeve acidification tubing string of 7 areal well patterns includes artesian well
Bottom to the sequentially connected ball-and-seat in well head direction, injector, level-one sleeve base, level-one K344 packer, level-one sliding sleeve injector,
Level-one chamfer tool oil pipe, second level sleeve base, second level K344 packer, second level sliding sleeve injector, second level chamfer tool oil pipe, three
Grade sleeve base, three-level K344 packer, three-level sliding sleeve injector, three-level chamfer tool oil pipe, level Four sleeve base, level Four K344 envelope
Every device, level Four sliding sleeve injector, level Four chamfer tool oil pipe, Pyatyi K344 packer, Pyatyi chamfer tool oil pipe and tool oil
Pipe.
4. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that:
In the step S3, when selected horizontal well pattern is 5 areal well patterns, the acidizing treatment interval number of 5 areal well patterns
Design has 4 sections, wherein 1,4 section of progress acidizing treatment, 2,3 sections carry out acidification plus complementary energy integration of operation；Selected Horizontal Well net form
When formula is 7 areal well patterns, the acidizing treatment interval number design of 7 areal well patterns has 5 sections, wherein 2,4 sections carry out acidification and add
Complementary energy integration of operation, 1,3,5 section of progress acidizing treatment.
5. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that:
In the step S4, acid solution used in acidizing treatment is buffer regulated HF acid, and pump fluence is 30-40 m3, discharge capacity is 1.0-2.0 m3/ min,
Liquid used in complementary energy operation is displacement of reservoir oil fracturing fluid, and pump fluence is 500-1000 m3, discharge capacity is 1.0-2.0 m3/min。
6. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 5 blocks horizontal well in segments acidization tool, which is characterized in that
The buffer regulated HF acid is grouped as by the group of following weight percent: technical hydrochloric acid 10-15%, hydrofluoric acid 1.5-3%, acetic acid 1.0-
3.0%, ferrous stability 0.4-0.6%, salt acid inhibitor 0.5-1.5%, cleanup additive 0.5-1.5%, surplus are water；
Wherein, the mass percentage concentration of the technical hydrochloric acid is 31%, and the mass percentage concentration of hydrofluoric acid is 40%；The iron ion
Stabilizer is one of acetic acid, citric acid, disodium edta.
7. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 5 blocks horizontal well in segments acidization tool, which is characterized in that
The displacement of reservoir oil type fracturing fluid is grouped as by the group of following weight percent: the Sulfonates washing oil surfactant of 0.1-0.5%,
The KCl of 0.5-1.5%, surplus are water.
8. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, which is characterized in that
The active water is grouped as by the group of following weight percent: cleanup additive 0.2-0.8%, clay stabilizer 0.2-0.8%, surplus are
Water.
9. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, it is characterised in that:
The pump note discharge capacity of active water is 1-2.0m in the step S53/min。
10. a kind of Oil in Super-low Permeability oil reservoir low pressure according to claim 1 blocks horizontal well in segments acidization tool, feature exists
In: closing well diffusion, which refers to, in the step S5 forces diffusion strata pressure by wellhead shut-in, and pressure derivative connects after closing well 1-2 days
When being bordering on 0, fluid flow state switchs to stratum linear flow or radial flow by crack linear flow, and matrix filtrational resistance increases, can tie at this time
Beam closing well.
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