CN105781458B - A kind of offshore platform explosion fracturing well head pressure releasing method - Google Patents
A kind of offshore platform explosion fracturing well head pressure releasing method Download PDFInfo
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- CN105781458B CN105781458B CN201610118543.2A CN201610118543A CN105781458B CN 105781458 B CN105781458 B CN 105781458B CN 201610118543 A CN201610118543 A CN 201610118543A CN 105781458 B CN105781458 B CN 105781458B
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- 238000004880 explosion Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 241001074085 Scophthalmus aquosus Species 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- 238000007790 scraping Methods 0.000 claims abstract description 3
- 238000005553 drilling Methods 0.000 claims description 18
- 239000003721 gunpowder Substances 0.000 claims description 11
- 230000037452 priming Effects 0.000 claims description 11
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005713 exacerbation Effects 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 18
- 239000007789 gas Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000005474 detonation Methods 0.000 description 5
- 239000003380 propellant Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 238000013019 agitation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
-
- 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- 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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of offshore platform explosion fracturing well head pressure releasing method, comprise the following steps：Remove production deck wellhead tree tree, standpipe, the manifold component being made up of kill manifold and choke manifold, the wellhead blowout preventor group comprising universal blowout preventer are installed, former well flow string is played, well-flushing is carried out after scraping well operations, well liquid within the cartridge is substituted for the well killing fluid of certain weight proportion, pulled out of hole；Lower explosion fracturing operating tool string；Explosion fracturing operating tool string upper port sets the brill card slips pushed down by double suspension ring, and double suspension ring upper end connection tops are driven, and explosion fracturing operating tool string upper end connects well cementation pump, threeway another port connection mud pit by high-pressure hose with threeway；The valve of kill manifold and choke manifold is opened, oil jacket annular space splashing liquid is oriented to mud pit, closes universal blowout preventer；Explosion fracturing pressurization igniting；Act explosion fracturing operating tool string.The present invention can prevent platform by oil pollution while ensuring that well head and downhole tool are safe.
Description
Technical field
The present invention relates to a kind of pressure releasing method, is to be related to a kind of offshore platform explosion fracturing well head pressure release in particular
Method.
Background technology
Explosion fracturing is carry out pressure break to stratum using gunpowder or propellant combustion generation high temperature and high pressure gas one
Technological means, also known as high enegry gas fracturing, the country by the research and extension of nearly 30 years, have developed into one substantially into
It is ripe, achieve in each field use good economic benefits, transform volume increase to the oil-gas Layer that comprehensive pressure break develops
New technology.This technology is because operation is simple, low-cost, effect protrudes, particularly suitable for East Sea gas field, the South Sea in China sea
The fracturing yield increasing of some nearly water reservoirs such as east oilfields, be and hydraulic fracturing after, offshore oilfield is in terms of low permeability reservoir exploitation
The technology explored.
But the well head pressure release mode commonly used in existing land oil field explosion fracturing operation security risk be present and environment is broken
Bad influence, such as cable construction is more using unlimited wellhead type pressure release；Tubing string construction then more uses packer setting or charges
Structure coating Seal Oil collar short side formula prevents hydrojet, and reduces the risk altered on operating tool string using buffering pipe nipple.It is spacious
It is one about ten meters of high fluid columns of the unexpected splash of well head that it is more, which to observe situation, for mouthful mode that drives a well, and is also easy to produce well site environmental pollution, together
When easily induce blowout, it is also possible to occur hydrogen sulfide or CO gas leakage.《High energy gas fracture bomb Gas Components security
Test evaluation is studied》、《The production of CO gas and the poly- scattered law study of well head in high enegry gas fracturing》Part is described Deng periodical literature
Gunpowder produces the situation of carbon monoxide.
Patent CN201310060014.8 discloses a kind of buried sand high energy gas stress cracking, while elaborates patent
Weak point in CN200810103910.7, patent CN200810103909.4 and patent CN200920245191.2.For
Shown operating type, oil jacket annular pressure caused by operation employ packer, gas, charges structure coating and carry out lattice
Gear, well head is comparatively safe, but unfavorable factor is increase measure difficulty, is easily caused removing seal for packer difficulty and causes downhole oil
The problems such as pipe flexural deformation, while charges build coating under explosion fracturing high-pressure situations, also easily make solid particulate matter pressure
Real reservoir, injury is produced, and sand washing and de-plugging can increase work operations amount.
In summary, there is larger potential safety hazard in the mode of well head pressure release at present, and offshore oilfield platform operations space is narrow
It is narrow, marine environment is faced again, it is higher to job safety and environmental protection requirement.
The content of the invention
The invention aims to overcome deficiency of the prior art, there is provided a kind of offshore platform explosion fracturing well head is let out
Pressure method, while ensuring that well head and downhole tool are safe platform can be prevented by oil pollution.
The purpose of the present invention is achieved through the following technical solutions.
The offshore platform explosion fracturing well head pressure releasing method of the present invention, comprises the following steps：
Step 1, replace well killing fluid：Production deck wellhead tree tree is removed, standpipe is installed, by kill manifold and throttle pipe
The manifold component of remittance composition, the wellhead blowout preventor group comprising universal blowout preventer, the manifold component and wellhead blowout preventor group are set
Between between deck and work deck, former well flow string is played, well-flushing is carried out after scraping well operations, well liquid within the cartridge is substituted for
The well killing fluid of certain weight proportion, pull out of hole；
Step 2, lower explosion fracturing operating tool string；
Step 3, work deck safety operation：The explosion fracturing operating tool string upper port is set to be pushed down by double suspension ring
Brill card slips, double suspension ring upper ends connection top driven, and the explosion fracturing operating tool string upper end is led to by high-pressure hose and three
Connect well cementation pump, threeway another port connection mud pit；
Step 4, between deck safety operation：The valve of kill manifold and choke manifold is opened, by oil jacket annular space splash
Guiding fluid mud pit, close universal blowout preventer；
Step 5, explosion fracturing pressurization igniting：Well cementation pump suppresses igniting, and the valve of threeway is opened while delayed ignition
Door, by the liquid pressure release of splash in explosion fracturing operating tool string to mud pit；
Step 6, after the completion of explosion fracturing pressure release, act explosion fracturing operating tool string.
Well killing fluid in the step 1 for addition potassium chloride exacerbation seawater or water, well killing fluid density 1.01~1.05 ×
103kg/m3。
Explosion fracturing operating tool string in the step 2 includes priming device and the bear gun with gunpowder, the detonation dress
Put upper end and be connected with damper, crossover sub, connecting tube, the connecting tube is made up of oil pipe or drilling rod.
Well cementation pump in the step 5 is suppressed, and it is 10~20MPa to suppress value.
Compared with prior art, beneficial effect caused by technical scheme is：
(1) present invention carries out multiple fixation to explosion fracturing operating tool string, on the basis of using multistage longitudinal damper, adopts
Being sealed and pushed up to drive with wellhead blowout preventor group coordinates double suspension ring pressures to bore card slips, and the aspect of upper, middle and lower three is carried out to operating tool string
It is effectively fixed, prevent from altering on explosion fracturing operating tool string；
(2) in the present invention, it is to be closed by universal blowout preventer outside the connecting tube of between deck top to close universal blowout preventer
Annular space, amplitude is altered on connecting tube detonation moment to reduce, while by splashing liquid pressure release in pit shaft to mud pit；
(3) present invention in, by kill manifold and choke manifold the liquid of splash in oil jacket annular space can directly be drained into
Enter mud pit, the liquid of splash in explosion fracturing operating tool string can be drained directly into by mud by high-pressure hose and threeway
Pond, platform splash greasy dirt or marine pollution can be prevented；It can also be pressed in the event of blowout or well kick using kill manifold
Well operations, wellhead blowout preventor group have also further ensured that security, it also avoid toxic gas in addition and are directly spread in well site, are protected
Well head safe is demonstrate,proved and environment is clean and tidy；
(4) in the present invention, do not made using packer, gas or charges structure coating Seal Oil set annular space directly
Casing pressure normally discharges, and prevents that down-hole string torsional deformation or removing seal for packer caused by high pressure are difficult；By underground
Sealing means are changed to the sealing of wellhead blowout preventor group, and pressure passes through manifold component pressure release, reduces liquid completely to instrument
Surge；
(5) in the present invention, it is not necessary to set packer or back-up sand, sand washing operation, simplify work flow, put down with current
Platform working space and equipment can carry out, and it is convenient to realize, safe and feasible；
(6) in the present invention, due to that by the way of charges build coating, solid will not caused to fill under high-pressure situations
Fill out thing and block reservoir, reduce reservoir pollution；
(7) in the present invention, because well head pressure is normally discharged, explosion fracturing operating tool string is also safe, can enter one
Step improves gunpowder dosage, to strengthen the action effect of explosion fracturing.
Brief description of the drawings
Fig. 1 is the operation principle schematic diagram of the present invention.
Fig. 2 is the structural representation of explosion fracturing operating tool string in Fig. 1.
Reference:1 pit shaft；2 explosion fracturing operating tool strings；3 production decks；4 standpipes；5 between decks；6 kill manifolds；
7 choke manifolds；8 universal blowout preventers；9 work decks；10 bore card slips；11 pairs of suspension ring；Drive on 12 tops；13 high-pressure hoses；14 3
It is logical；15 well cementation pumps；16 mud pits；17 Agitation Tanks；21 crossover subs；22 connecting tubes；23 bear gun；24 priming devices；25 dampings
Device.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The offshore platform explosion fracturing well head pressure releasing method of the present invention, comprises the following steps：
Step 1, replace well killing fluid：The production wellhead tree tree of deck 3 is removed, as shown in figure 1, installing standpipe 4, by kill-job
Manifold 6 and the manifold component of the composition of choke manifold 7, the wellhead blowout preventor group comprising universal blowout preventer 8, the installation of above-mentioned part are suitable
Sequence and quantity can flexibly change as needed, and the manifold component and wellhead blowout preventor group are arranged between deck 5 and operation
Between deck 9, the associated components such as ram preventer can be also included in the wellhead blowout preventor group；Former well flow string is played, scrapes well
Well-flushing is carried out after operation, first washes well with production, until being substituted for certain weight proportion without greasy dirt and impurity, then by liquid in pit shaft 1
Well killing fluid, ensure well in deposit-free, pull out of hole；The well killing fluid is liquid-tight for the exacerbation seawater of addition potassium chloride or water, kill-job
Degree 1.01~1.05 × 103kg/m3；
Step 2, lower explosion fracturing operating tool string 2, the explosion fracturing operating tool string 2 include priming device 24 and with fire
The bear gun 23 of medicine, the gunpowder may be disposed inside or outside bear gun 23, and the upper end of priming device 24 is connected with some
Damper 25, some crossover subs 21, some connecting tubes 22, the connecting tube 22 can be made up of oil pipe or drilling rod, the damping
Device 25, crossover sub 21, the quantity of connecting tube 22 and position can flexibly be set as needed, can also be connected with related work
Tool, as shown in Figure 2；
Step 3, the safety operation of work deck 9：The upper port of explosion fracturing operating tool string 2 is set by double suspension ring 11
The brill card slips 10 pushed down, the double upper end of suspension ring 11 connection tops drive 12, and the upper end of explosion fracturing operating tool string 2 is soft by high pressure
Pipe 13 and the connection well cementation pump 15 of threeway 14, the another port of threeway 14 connection mud pit 16, the well cementation pump 15 can also connect respectively
Agitation Tank 17 and mud pit 16, the pressure release for pipeline when suppressing of pump 15 of being easy to cement the well；
Step 4, the safety operation of between deck 5：The valve of kill manifold 6 and choke manifold 7 is opened, oil jacket annular space is sprayed
The guiding fluid mud pit 16 splashed, the valve of kill manifold 6 and choke manifold 7 is kept not close during subsequent job, with
Just after step 5, the liquid of the splash of pit shaft 1 carries out pressure release by kill manifold 6 and choke manifold 7；Universal blowout preventer 8 is closed,
The annular space closed by closing universal blowout preventer 8 outside the top connecting tube 22 of between deck 5, it is quick-fried to reduce connecting tube 22
Amplitude is altered on combustion moment, while by splashing liquid pressure release in pit shaft 1 to mud pit 16；
Step 5, explosion fracturing pressurization igniting：Well cementation pump 15 suppresses igniting, and it can be 10~20MPa to suppress value, pump 15 of cementing the well
After upper pressure gauge bust, expression is lighted a fire successfully, while delayed ignition, the valve of threeway 14 is opened in three minutes, by detonation
The liquid pressure release of splash in pressing crack construction tubing string 2 is to mud pit 16；
Step 6, after the completion of explosion fracturing pressure release, act explosion fracturing operating tool string 2.
Embodiment one：
Well killing fluid described in step 1 is that density is 1.05 × 103kg/m3Potassium chloride aggravate seawater.
Step 2: Step 3: the explosion fracturing operating tool string 2 described in step 5 and step 6 mainly includes from bottom to up
Bear gun 23, priming device 24, damper 25 (3 section), crossover sub 21 (5), connecting tube 22 with solid gunpowder are (if drilled dry
Bar) related tool, particularly relevant tool parameters and quantity are as shown in table 1.
The explosion fracturing operating tool string artillery salvo table of table 1
Universal blowout preventer 8 described in step 4 is annular preventer in preventer group waterborne, using size 13-5/
8 ", stress levels 35MPa, when closing universal blowout preventer 8, hydraulic pressure most very much not runs more than 15MPa, and usual hydraulic control is in 8.5-
10.5MPa。
Well cementation pump 15 described in step 5 is suppressed, and it is 12.99~17.04MPa to suppress value.
By taking the well of Lufeng 13-1 oil fields 6 of implementation as an example, well killing fluid density η=1.05g/cm3；G=0.0098；Vertical depth h=
2480.0m；115 DEG C of detonation pressure well section temperature (shear pin reduces by 8% with temperature).
(1) liquid column hydrostatic pressure PLiquid=η gh=1.05 × 0.0098 × 2480=25.5MPa；
(2) single pin actual shearing value：F1=S × (1-8%)=3.67 × (1-8%)=3.3764, wherein, S sells to be single
The shear pressure of nail；
(3) well head add-on security pressure value：PSafety=12MPa；
(4) shear pin number:N=(PLiquid+PSafety)÷F1=(25.5+12) ÷ 3.3764=11.1 ≈ 12；
(5) well head pressurization value
Pmax=N × F1× (1+5%)-PLiquid
=12 × 3.3764 × 1.05-25.5
=17.04MPa
Pmix=N × F1× (1-5%)-PLiquid
=12 × 3.3764 × 0.95-25.5
=12.99MPa
Shear pin number needed for being calculated more than：12；
Suppressed needed for priming device 24：Minimum 12.99MPa, is up to 17.04MPa.
Embodiment two：
The present embodiment is unlike embodiment one：Well killing fluid described in step 1 for solution density 1.01~1.05 ×
103kg/m3Potassium chloride solution.The construction method and construction parameter of remaining step are identical with embodiment one.
Embodiment three：
The present embodiment is unlike embodiment one：Step 2: Step 3: detonation pressure described in step 5 and step 6
Split in operating tool string 2 bear gun 23 can use diameter 51mm, 60mm, 73mm, 89mm, 102mm, 114mm, 127mm, 140mm,
159mm, 178mm model；Solid gunpowder can use single-base gun propellant, double-base propellant, triple-base propellant and composite propellant；Rise
Impact detonator also can be used in quick-fried device 24, such as model HQBQ1-1；Remaining damper 25, crossover sub 21, connecting tube 22 are related
Number of tools and size meet oil field standard size, can flexible combination conversion.
In the present embodiment, the construction method and construction parameter of remaining step are identical with embodiment one.
Example IV：
The present embodiment is unlike embodiment one：Universal blowout preventer 8 described in step 4 can use conical rubber core ring
Shape preventer, spherical glue core annular preventer, assembly adhesive core annular preventer, size have 7-1/16 ", 9 ", 11 ", 13-5/8 ",
16-3/4”、20-3/4”、21-1/4”、26-3/4”；Operating pressure is including 14MPa, 21MPa, 35MPa, 70MPa, 105MPa etc.
Model.
In the present embodiment, the construction method and construction parameter of remaining step are identical with embodiment one.
Embodiment five：
The present embodiment is unlike embodiment one：Lighted a fire using explosion fracturing caber, needed to use in priming device 24
Impact detonator.The construction procedure of step 5 is lighted a fire using explosion fracturing caber, after caber while delayed ignition, three minutes
The interior opening valve of threeway 14, by splashing liquid pressure release in explosion fracturing operating tool string 2 to mud pit 16.
In the present embodiment, the construction method and construction parameter of remaining step are identical with embodiment one.
The field application example of the present invention：
1. the present invention is applied to South China Sea east oilfields Lufeng 13-1 oil fields 26H wells.The well existed on May 12nd, 2014
Chinese offshore oilfield implements explosion fracturing yield-increasing technology first, and construction well depth is 3040m-3054m, has used 20 kilograms and 40 public affairs
Jin gunpowder is implemented, and it is respectively 49MPa, 60MPa that stratum peak value, which produces surge pressure,.Explosion fracturing operating tool string 2 using 5 "+
3-1/2 " drilling rods combine, and have used 127mm perforating guns, the longitudinal dampers of three-level 2-7/8 ", YBK1-3D-TY types pressure drilling to rise
Quick-fried device.Using the present invention, the normal pressure release of oil jacket annular space, drilling rod, drilling rod is without friction during construction, acts drilling rod and downhole tool
It is without exception.
2. the present invention is applied to the well of South China Sea east oilfields Lufeng 13-1 oil fields 6.The well is on May 28th, 2015 in
State's offshore oilfield implements explosion fracturing yield-increasing technology, and construction well depth is 2565m-2574m, has used 20 kilograms of gunpowder to carry out real
Apply, it is 50.18MPa that stratum peak value, which produces surge pressure,.Explosion fracturing operating tool string 2 uses 5 "+3-1/2 " drilling rod combination, use
127mm perforating guns, the longitudinal dampers of three-level 2-7/8 ", YBK1-3D-TY type pressure drilling priming devices.Using the present invention, oil
Annular space, the normal pressure release of drilling rod are covered, drilling rod is without friction during construction, acts drilling rod and downhole tool is without exception.
3. the present invention is applied to South China Sea east oilfields Lufeng 13-1 oil fields 19H wells.The well was on December 24th, 2015
Implement explosion fracturing yield-increasing technology in Chinese offshore oilfield, construction well depth is 2818m-2860m, has used 20 kilograms of gunpowder to carry out
Implement, it is 58MPa that stratum peak value, which produces surge pressure,.Explosion fracturing operating tool string 2 uses 5 "+3-1/2 " drilling rod combination, use
127mm perforating guns, the longitudinal dampers of three-level 2-7/8 ", YBK1-3D-TY type pressure drilling priming devices.Using the present invention, oil
Annular space, the normal pressure release of drilling rod are covered, drilling rod is without friction during construction, acts drilling rod and downhole tool is without exception.
Although the function and the course of work of the present invention are described above in conjunction with accompanying drawing, the invention is not limited in
Above-mentioned concrete function and the course of work, above-mentioned embodiment is only schematical, rather than restricted, ability
The those of ordinary skill in domain is not departing from present inventive concept and scope of the claimed protection situation under the enlightenment of the present invention
Under, many forms can also be made, these are belonged within the protection of the present invention.
Claims (4)
1. a kind of offshore platform explosion fracturing well head pressure releasing method, it is characterised in that comprise the following steps：
Step 1, replace well killing fluid：Production deck wellhead tree tree is removed, standpipe is installed, by kill manifold and choke manifold structure
Into manifold component, the wellhead blowout preventor group comprising universal blowout preventer, during the manifold component and wellhead blowout preventor group are arranged at
Between between deck and work deck, rise former well flow string, carry out well-flushing after scraping well operations, well liquid within the cartridge be substituted for necessarily
The well killing fluid of proportion, pull out of hole；
Step 2, lower explosion fracturing operating tool string；
Step 3, work deck safety operation：The explosion fracturing operating tool string upper port sets the brill pushed down by double suspension ring
Card slips, double suspension ring upper end connection tops are driven, and the explosion fracturing operating tool string upper end is connected solid by high-pressure hose with threeway
Well pump, threeway another port connection mud pit；
Step 4, between deck safety operation：The valve of kill manifold and choke manifold is opened, by the liquid of oil jacket annular space splash
Mud pit is oriented to, closes universal blowout preventer；
Step 5, explosion fracturing pressurization igniting：Well cementation pump suppresses igniting, and the valve of threeway is opened while delayed ignition, will
The liquid pressure release of splash in explosion fracturing operating tool string is to mud pit；
Step 6, after the completion of explosion fracturing pressure release, act explosion fracturing operating tool string.
2. offshore platform explosion fracturing well head pressure releasing method according to claim 1, it is characterised in that in the step 1
Well killing fluid for addition potassium chloride exacerbation seawater or water, well killing fluid density 1.01~1.05 × 103kg/m3。
3. offshore platform explosion fracturing well head pressure releasing method according to claim 1, it is characterised in that in the step 2
Explosion fracturing operating tool string include priming device and the bear gun with gunpowder, the priming device upper end be connected with damper,
Crossover sub, connecting tube, the connecting tube are made up of oil pipe or drilling rod.
4. offshore platform explosion fracturing well head pressure releasing method according to claim 1, it is characterised in that in the step 5
Well cementation pump suppress, it is 10~20MPa to suppress value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610118543.2A CN105781458B (en) | 2016-03-02 | 2016-03-02 | A kind of offshore platform explosion fracturing well head pressure releasing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610118543.2A CN105781458B (en) | 2016-03-02 | 2016-03-02 | A kind of offshore platform explosion fracturing well head pressure releasing method |
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| Publication Number | Publication Date |
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| CN105781458A CN105781458A (en) | 2016-07-20 |
| CN105781458B true CN105781458B (en) | 2018-02-23 |
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| CN109779596B (en) * | 2019-02-18 | 2021-03-02 | 中海油能源发展股份有限公司 | Offshore oilfield water hammer fracturing implementation method |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC Energy Development Co., Ltd. Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Energy Development Co., Ltd. Patentee before: China National Offshore Oil Corporation |