CN107724954B - A kind of Fractured carbonate strata is drilled well method and system - Google Patents
A kind of Fractured carbonate strata is drilled well method and system Download PDFInfo
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- CN107724954B CN107724954B CN201710946183.XA CN201710946183A CN107724954B CN 107724954 B CN107724954 B CN 107724954B CN 201710946183 A CN201710946183 A CN 201710946183A CN 107724954 B CN107724954 B CN 107724954B
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- 238000000034 method Methods 0.000 title claims abstract description 55
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 46
- 238000005553 drilling Methods 0.000 claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000012530 fluid Substances 0.000 claims abstract description 85
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000010779 crude oil Substances 0.000 claims abstract description 12
- 239000003345 natural gas Substances 0.000 claims abstract description 11
- 235000019476 oil-water mixture Nutrition 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims description 35
- 230000006837 decompression Effects 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 36
- 235000019198 oils Nutrition 0.000 abstract description 33
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 241001074085 Scophthalmus aquosus Species 0.000 description 10
- 239000004615 ingredient Substances 0.000 description 10
- 239000004568 cement Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
-
- 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
- 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
- E21B21/085—Underbalanced techniques, i.e. where borehole fluid pressure is below formation 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
- E21B47/00—Survey of boreholes or wells
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- 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)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a kind of Fractured carbonate strata and is drilled well method and system, and it includes: that protective casing at the top of reservoir and is cemented the well that the Fractured carbonate strata, which bores completion method,；Under balance pressure drilling is implemented to Reservoir Section, and monitors formation fluid quantum of output situation；When monitoring formation fluid quantum of output exception, the fluidity of formation fluid is determined；When formation fluid is crude oil or natural gas or oil water mixture, implements drillstem test and determine production information；Completion mode is determined according to the production information.The Fractured carbonate strata of present embodiment, which bores completion method and can solve high salinity complexity oil water relation Fractured carbonate strata, can not determine the technical problem of suitable completion mode because being difficult to accurately identify distribution of oil and water layers by well-log information, the complete well suitable for high salinity complexity oil water relation Fractured carbonate strata.
Description
Technical field
The present invention relates to oil-gas geologies to be drilled well field, particularly a kind of suitable for high salinity complexity oil water relation
Fractured carbonate strata is drilled well method and system.
Background technique
During oil-gas exploration and development, it is most important that completion efficiently, safe is drilled well operations.Wherein, " efficient " to need
Drill footage speed is improved using advanced suitable drilling technology, drillng operation is completed with most fast speed, drilling well is completed and makees
Suitable well-completing process is selected to ensure the maximization of oil and gas production after industry；" safely " it needs to ensure using suitable technological measure and bore
Well operations are smoothly implemented, and avoid the occurrence of the accidents such as leakage, spill and leakage, blocked portion complexity, while ensureing the well after Completion Operations and complete well
Cylinder safety.
In high salinity complexity oil water relation Fractured carbonate strata, because it has complicated oil-water-layer relationship,
Before brill can not the specific water layer of Accurate Prediction and oil reservoir position, also can not accurately estimate bore meet oil-water-layer pressure and produce water
Oil-producing situation.This uncertainty causes complex accident during conventional drilling (overbalance) relatively more, exists while opening not
With the oil-water-layer of pressure, there are the narrow Density Window situation of safety drilling, drilling well overflow and circulation problems are prominent, even send out when serious
Raw bit freezing is complicated.Conventional Overbalance Drilling operation is generallyd use in the prior art, once drilling strata overflow, then asked by closing well
Pressure calculates actual strata pressure, and improves the density kill-job good ground fluid of drilling fluid.In fact, in fractured reservoir,
Stratum liquid usually contains certain gas, and slippage effect, closing well can occur for the gas after the overflow of stratum in formation fluid
The pressure sought not is stratum true pressure, improves drilling fluid density or higher than actual formation pressure or lower than being practically laminated
Power.If density is excessively high, leakage complexity occurs, drilling fluid density need to be further decreased；If density is too low, continue that overflow occurs
Complexity need to further increase drilling fluid density.Therefore the generation spill and leakage conversion that can be continued using conventional drilling mode, influences to bore
Well operations efficiency.
After the completion of drillng operation, well has been needed.Complete well refer to uncased wellbore bore up to after target well depth, make shaft bottom and oil reservoir with
The technique that certain fabric connectivity gets up is that drilling well works beginning of the last one important link and petroleum production engineering.It reasonably selects
Oil/gas well completion mode is most important, and the quality of total completion time directly influences oily capacity of well and economic life.Crack
Property hydrochlorate reservoir conventional completed well mode is broadly divided into based on the completion method that do not cement the well and casing cementing completion mode.It does not cement the well
Completion method is divided into complete well of barefoot completion, sieve tube completion, open hole packer etc. again.The high yield reservoir of usual fracture development is to avoid
High-density cement mortar blocking crack and hole reduce reservoir yield during cased hole completion, mostly use the completion mode that do not cement the well,
And low yield multilayer or oil water relation complicated reservoirs are that satisfaction effectively packing water layer or later period reservoir measures to reform needs mostly use set
Pipe completion mode.High salinity complexity oil water relation Fractured carbonate strata is preferably used since its oil water relation is complex
The complete well of casing cementing, but there are the risks of well cementing operation high-density cement mortar blocking high productivity layer；And use the complete well side not cemented the well
If selection barefoot completion, sieve tube completion are unfavorable for later period reservoir measures to reform operation, while the envelope of oil-water-layer is also not implemented in method
Every；And the complete well of open hole packer is selected to need through well logging recognition oil-water-layer, water layer is effectively insulated.Because of such reservoir formation water
Salinity is higher, and to maintain wellbore stability, drilling process is needed using the higher drilling fluid drilling of salinity, and existing well logging skill
Art identifies that fluid properties there is a problem, influence the implementation of open hole packer completion mode under high salinity.
In summary, the prior art not can effectively solve Fractured carbonate strata under high salinity complexity oil water relation
It is drilled well technical problem, it is therefore necessary to propose that Fractured carbonate strata is drilled well side under high salinity complexity oil water relation
Method.
Summary of the invention
In view of the deficiencies in the prior art, the object of the present invention is to provide a kind of suitable for high salinity complexity oil water relation
Fractured carbonate strata is drilled well method and system.
The scheme that the invention patent uses is:
A kind of Fractured carbonate strata brill completion method, comprising:
Protective casing at the top of reservoir and is cemented the well；
Under balance pressure drilling is implemented to Reservoir Section, and monitors formation fluid quantum of output situation；
When monitoring formation fluid quantum of output exception, the fluidity of formation fluid is determined；
When formation fluid is crude oil or natural gas or oil water mixture, implements drillstem test and determine production information；
Completion mode is determined according to the production information.
As a preferred embodiment, described determine that completion mode step includes: according to the production information
When the production information is higher than the first preset value, using the complete well of open hole packer mode；
When the production information is lower than the second preset value, using the complete well of casing cementing completion mode.
As a preferred embodiment, described determine completion mode step according to the production information further include:
When the production information is lower than preset value, continue to implement described to Reservoir Section implementation under balance pressure drilling step.
As a preferred embodiment, further include:
When monitoring formation fluid quantum of output is not abnormal, using the complete well of casing cementing completion mode.
As a preferred embodiment, implementing under balance pressure drilling step described to Reservoir Section, according to target well
Drilling fluid density is arranged in the pore pressure in predicted shaft bottom, and ensures bottom pressure compared to the small 1~4MPa of formation pore pressure.
As a preferred embodiment, the mode of the pore pressure according to the predicted shaft bottom of target well are as follows:
When there is offset well to go into operation, then according to the strata pressure of actual measurement formation pore pressure coefficient prediction target well；
When offset well is not gone into operation, then the strata pressure of target well is predicted according to offset well well-log information.
As a preferred embodiment, implementing under balance pressure drilling step described to Reservoir Section, in well head drilling well
Simultaneously wellhead back pressure is arranged in liquid outlet line setting back-pressure valve, and the difference to ensure bottom pressure and formation pore pressure is relative constant.
As a preferred embodiment, being more than the one of the rated pressure of well mouth rotary preventer in the wellhead back pressure
When half, drilling fluid density is improved to reduce wellhead back pressure.
As a preferred embodiment, further include:
When the formation fluid is water flooding and quantum of output is greater than predetermined value, implement the decompression that discharges water.
As a preferred embodiment, the implementation discharges water, depressurization step includes:
The choke pressure for reducing back-pressure valve allows water flooding nature output using under balance pressure drilling equipment.
As a preferred embodiment, in the pressure reduction that discharges water, 300~1000m of every output water flooding3,
Then closing well asks pressure once to calculate formation pore pressure coefficient；Stop when the formation pore pressure coefficient reduces by 0.2 or more
Discharge water decompression, implements described to Reservoir Section implementation under balance pressure drilling step.
As a preferred embodiment, further include:
Reach 10000m in accumulative output water flooding3When, closing well calculates formation pore pressure after seeking pressure；Determining earth bore
When gap pressure does not reduce, implements expansion tube and insulate high pressure water layer；Implement described pair of storage after implementing expansion tube packing high pressure water layer
Interval implements under balance pressure drilling step.
As a preferred embodiment, further include:
When the formation fluid is water flooding and quantum of output is less than predetermined value, continue to implement described deficient to Reservoir Section implementation
Balanced drilling step.
A kind of Fractured carbonate strata brill completion system, comprising:
Cementing unit, for protective casing at the top of reservoir and to be cemented the well；
Drilling well monitoring device for implementing under balance pressure drilling to Reservoir Section, and monitors formation fluid quantum of output situation；
Fluidity determining device, for determining the fluidity of formation fluid when monitoring formation fluid quantum of output exception；
Test device, for it is true to implement drillstem test when formation fluid is crude oil or natural gas or oil water mixture
Determine production information；
Completion system, for determining completion mode according to the production information.
The utility model has the advantages that
By above description as can be seen that the Fractured carbonate strata of present embodiment, which bores completion method, passes through monitoring ground
Layer fluid quantum of output situation, and when monitoring formation fluid quantum of output exception, the fluidity of formation fluid is determined, then on stratum
When fluid is crude oil or natural gas or oil water mixture, implements drillstem test and determine production information, believe further according to the yield
It ceases and determines completion mode, in this way, the Fractured carbonate strata brill completion method of present embodiment can solve high salinity and answer
Miscellaneous oil water relation Fractured carbonate strata can not determine properly because being difficult to accurately identify distribution of oil and water layers by well-log information
Completion mode technical problem, the complete well suitable for high salinity complexity oil water relation Fractured carbonate strata.
Referring to following description and accompanying drawings, only certain exemplary embodiments of this invention is disclosed in detail, specifies original of the invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, embodiments of the present invention include many changes, modifications and are equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those skilled in the art without any creative labor, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is that one embodiment of the present invention provides a kind of Fractured carbonate strata and is drilled well method flow diagram；
Fig. 2 is that one embodiment of the present invention provides a kind of Fractured carbonate strata and is drilled well method flow diagram；
Fig. 3 is the case casing programme schematic diagram using Fig. 2；
Fig. 4 is that one embodiment of the present invention provides a kind of Fractured carbonate strata and is drilled well system schematic.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to guarantor of the present invention
The range of shield.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
Fig. 1, Fig. 2 are please referred to, one embodiment of the present invention provides a kind of Fractured carbonate strata brill completion method, splits
It stitches acid carbonate stratum and bores the well completion work that completion method is suitable under high salinity complexity oil water relation.Specifically, the crack
Acid carbonate stratum bore completion method the following steps are included:
S10, protective casing at the top of reservoir and is cemented the well；
In this step, first drilling well is at the top of reservoir, then tripping in protective casing and cements the well, can so ensure Reservoir Section
The pit shaft safety of drilling process middle and upper part well section.
S20, under balance pressure drilling is implemented to Reservoir Section, and monitors formation fluid quantum of output situation；
Wherein, under balance pressure drilling is called underbalanced drilling, refers to that bottom pressure is less than strata pressure, the stream of ground end in drilling well
Body controlledly enters pit shaft and is recycled to the drilling technology on ground.
Reservoir Section is implemented under balance pressure drilling step described, according to the pore pressure in the predicted shaft bottom of target well, if
Drilling fluid density is set, and ensures bottom pressure compared to the small 1~4MPa of formation pore pressure.
The mode of the pore pressure according to the predicted shaft bottom of target well are as follows: when there is offset well to go into operation, then according to reality
The strata pressure of geodetic layer pore pressure coefficient prediction target well；When offset well is not gone into operation, then predicted according to offset well well-log information
The strata pressure of target well.
Reservoir Section is implemented under balance pressure drilling step described, back-pressure valve is set in wellhead drilling fluid outlet line and is set
Wellhead back pressure (choke pressure can be set in back-pressure valve) is set, the difference to ensure bottom pressure and formation pore pressure is relative constant.
When the wellhead back pressure is more than the half of the rated pressure of well mouth rotary preventer, improves drilling fluid density and returned with reducing well head
Pressure.
In this way, formation fluid flows into pit shaft under differential pressure action and with circulation of drilling fluid to ground in step S20
Face into oil gas water separator, and monitors formation fluid by sensor device and overflows situation (quantum of output situation).Wherein, it passes
Sensor equipment can be gas-monitoring sensing equipment, hydro carbons position monitoring sensor, and chlorine root monitors sensor etc..
S30, when monitoring formation fluid quantum of output exception, determine the fluidity of formation fluid；
In this step, when determining that the quantum of output (or spill-out) of formation fluid is abnormal, can as unit of the time output
Trend that measurer is significantly increased (for example the quantum of output of unit time is being stepped up or quantum of output reaches empirical value with first-class
Deng), the fluidity of overflow substance is judged by oil gas water separator or sensor device.
This, which allows for the fluid in usual stratum, can be water, is oil, be gas, the drilling well in liquid and drilling process
Liquid (generally water-base drilling fluid) mixes, it is difficult to judge the fluid of stratum out for which kind of fluid.By oil and gas and water
From rear, it can be collected into oil, gas, drilling fluid respectively, then can distinguish which kind of fluidity comes out in stratum be.Wherein, ground laminar flow
The fluidity of body is usually water flooding (also referred to as formation brine), crude oil, natural gas, oil water mixture.
S40, when formation fluid is crude oil or natural gas or oil water mixture, implement drillstem test and determine that yield is believed
Breath；
Wherein, drillstem test is also known as drill stem testing, the drillstem test refer in drilling one it is found that oil/gas show with
Afterwards, stop to bore the simultaneously special test equipment of tripping in immediately, the channel on oil gas outflow ground, the naked eye in drilling well midway are done using drilling rod
The test carried out in well (section).
S50, completion mode is determined according to the production information.
In this step, when the production information is higher than the first preset value, using the complete well of open hole packer mode；Or
Person, when the production information is lower than the second preset value, using the complete well of casing cementing completion mode.Wherein, believe in the yield
Breath may determine that this well is high-yield well when being higher than the first preset value, illustrate reservoir fissure development, at this time fractured-vuggy reservoir, Ying Caiyong
The complete well of open hole packer completion mode.The complete well of open hole packer completion mode can divide to pass through external packer of pipe and casing
The mode of the complete well of section has carried out well.
It may determine that this, for stripper well, is not fractured-vuggy reservoir, in this way, can when production information is lower than the second preset value
To be required to use the complete well of casing cementing completion mode in time according to geological reservoir.The complete well of casing cementing completion mode can be set
Pipe perforation completion, and according to oil-water-layer selective perforation section.
In one embodiment, the first preset value can be 50 tpds, and the second preset value can be 5 tpds, that is, on ground
Well of the yield of layer fluid higher than 50 tpds is high yield, is then low yield lower than 5 tons.
In a further embodiment, in the production information, lower than preset value, (preset value can be preset with above-mentioned second
It is worth identical, can also be different) when, it can choose well (such as above-mentioned complete well of casing cementing completion mode), it can also be without
Complete well and select to continue to implement described to implement under balance pressure drilling step to Reservoir Section.
By above description as can be seen that the Fractured carbonate strata of present embodiment, which bores completion method, passes through monitoring ground
Layer fluid quantum of output situation, and when monitoring formation fluid quantum of output exception, the fluidity of formation fluid is determined, then on stratum
When fluid is crude oil or natural gas or oil water mixture, implements drillstem test and determine production information, believe further according to the yield
It ceases and determines completion mode, in this way, the Fractured carbonate strata brill completion method of present embodiment can solve high salinity and answer
Miscellaneous oil water relation Fractured carbonate strata can not determine properly because being difficult to accurately identify distribution of oil and water layers by well-log information
Completion mode technical problem, the complete well suitable for high salinity complexity oil water relation Fractured carbonate strata.
Meanwhile the Fractured carbonate strata brill completion method of present embodiment can also solve high salinity complexity grease
It can not the specific water layer of Accurate Prediction and oil reservoir position, the pressure of oil-water-layer and production aquatic products oil in relationship Fractured carbonate strata
Overflow leakage caused by situation conversion, drillng operation low efficiency technical problem.
In one embodiment, it can also include: in monitoring ground laminar flow that the Fractured carbonate strata, which bores completion method,
When body quantum of output is not abnormal, using the complete well of casing cementing completion mode.Specifically, the complete well step can be according to drill footage situation
And geological reservoir requires to use the complete well of casing cementing completion mode in time.
In one embodiment, the Fractured carbonate strata bore completion method can with the following steps are included: S41,
When the formation fluid is water flooding and quantum of output is greater than predetermined value, implement the decompression that discharges water.In addition, the Fractured carbon
Completion method is bored on hydrochlorate stratum can be comprising steps of S42, in the formation fluid be water flooding and quantum of output less than predetermined value
When, continue to implement described to Reservoir Section implementation under balance pressure drilling step.
It is described implementation discharge water depressurization step include: reduce back-pressure valve choke pressure, allow ground using under balance pressure drilling equipment
Layer water nature output.Wherein, ground need to carry out the disposing task of output water in the pressure reduction that discharges water, and avoid pollution environment.
In the pressure reduction that discharges water, 300~1000m of every output water flooding3, then closing well asks pressure once to calculate stratum
Pore pressure coefficient.Stop the decompression that discharges water when the formation pore pressure coefficient reduces by 0.2 or more, implements described to Reservoir Section
Implement under balance pressure drilling step.
In addition, determine strata pressure do not decline predetermined amplitude (such as when above-mentioned 0.2), the crack acid carbonate
Layer bores completion method can be comprising steps of reach 10000m in accumulative output water flooding3When, closing well calculates earth bore after seeking pressure
Gap pressure；When determining that formation pore pressure does not reduce, implements expansion tube and insulate high pressure water layer；High pressure is insulated implementing expansion tube
Implement after water layer described to Reservoir Section implementation under balance pressure drilling step.
Completion method is bored below by the Fractured carbonate strata for implementing present embodiment to case block shown in Fig. 3,
In order to understand the present invention.
Please refer to Fig. 2, Fig. 3, case block mostly uses three body structures that drive a well (in general drilling process, often to get into a depthkeeping
After degree, in order to ensure subsequent well safety, the stratum for needing next layer of casing and being bored out with cement sealing prevents the borehole wall from collapsing
It collapses, leakage, overflow accident complexity.The drill bit of each size bores deep and tripping in correspondingly-sized casing, is known as one in this way and opens
It is secondary, and the size of a upper beginning is bigger than the next size opened time.It is at least 2 beginnings in usual drilling well, i.e., two open,
It may at most be opened using 7-8.The country generallys use 3 and opens, and at most opens using 5), an exploitation is drilled under 1600m with 311.2mm drill bit
Enter 244.5mm casing, cementing slurry returns to ground；Two exploitations are drilled into tripping in 177.8mm skill at the top of reservoir with 215.9mm drill bit
Art casing is simultaneously cemented the well, and cementing slurry returns to ground.Reservoir Section drilling process middle and upper part well section is ensured by tripping in protective casing
Pit shaft safety.
Case well three shown in Fig. 3 is opened after Reservoir Section spuds in, and under balance pressure drilling is implemented.According to the prediction of offset well drilling well
Formation pore pressure coefficient is 1.75, comprehensively considers the influence of differential pressure, casing annulus drilling fluid frictional resistance, wellhead back pressure, if
Determining drilling fluid density is 1.65~1.7.It is expected that differential pressure is 2~4MPa；The strata pressure comprehensive reference of the prediction of case well
The offset well Measured formation pressure of brought in well, the drilling fluid density of the drilled well Reservoir Section of offset well, complete borehole logging tool data.
In implementing underbalance operation process, back-pressure valve is set in wellhead drilling fluid outlet line and choke pressure is set,
Also referred to as wellhead back pressure, the difference to ensure bottom pressure and formation pore pressure are relative constant.If wellhead back pressure is more than well mouth rotary
When the half of the rated pressure of preventer, then drilling fluid density is improved to reduce wellhead back pressure.Formation fluid is in differential pressure action stream
Enter pit shaft and with circulation of drilling fluid to ground, into oil gas water separator, passes through sensor device and monitor formation fluid and overflow
Situation.
In drilling process, if monitoring, formation fluid quantum of output is abnormal, i.e., the quantum of output of unit time has obvious increase
When adding trend, the fluidity of overflow substance is judged by oil gas water separator or sensor device.Stratum that may be present in case well
Production fluid (formation fluid) is salt water, crude oil, oil water mixture.
If the fluidity of stratum production fluid that may be present is salt water in case well, and spillway discharge (quantum of output) is larger, according to
When the drilling well density that back pressure is promoted results in leakage situation, then implement waterproof decompression technique.Otherwise (the lesser situation of spillway discharge)
Continue to implement under balance pressure drilling.
Described discharging water is depressured technique, refers to using former under balance pressure drilling equipment, the appropriate throttling for reducing wellhead back pressure valve
Pressure, allows water flooding nature output, and ground need to carry out the disposing task of output water, avoid pollution environment.
In the pressure reduction that discharges water, 300~1000m of every output water flooding3, closing well, which is asked, presses primary, calculating formation pore pressure
Force coefficient, if formation pore pressure coefficient reduces by 0.2 or more, stopping, which discharges water, is depressured technique, continues to return and implements underbalance brill
Well operations.
When formation pore pressure coefficient is reduced less than 0.2, if accumulative output water flooding reaches 10000m3, closing well seeks pressure
Calculate formation pore pressure afterwards does not reduce yet, then implements expansion tube packing high pressure water layer process.After completing the packing of high pressure water layer,
Continue to implement under balance pressure drilling technique.
If the fluidity of stratum production fluid that may be present is crude oil or natural gas or oil water mixture in case well, real
Apply drillstem test technique.When it is high yield that drillstem test, which seeks postpartum yield, illustrate reservoir fissure development, Ying Caiyong S6B naked eye envelope
Every the complete well of device completion mode.Drillstem test ask postpartum yield be low yield when, it is determined whether complete well, however, it is determined that endless well then after
It is continuous to use under-balance drilling operation after follow-up hole.In addition, can also be required to use casing in time according to geological reservoir in low yield
The well cementation complete well of completion mode.
When formation fluid quantum of output abnormal conditions being not present in case well drilling process, it is determined whether complete well.True
Surely it has needed to be required in time according to drill footage situation and geological reservoir using the complete well of casing cementing completion mode when well.
In the above manner, can ensure that Fractured carbonate strata highly effective and safe bores under high salinity complexity oil water relation
The smooth implementation of completion practice.
Referring to Fig. 4, one embodiment of the present invention also provides a kind of Fractured carbonate strata brill completion system, packet
It includes: cementing unit 1, for protective casing at the top of reservoir and to be cemented the well；Drilling well monitoring device 2, for implementing to Reservoir Section
Under balance pressure drilling, and monitor formation fluid quantum of output situation；Fluidity determining device 3, for monitoring formation fluid quantum of output
When abnormal, the fluidity of formation fluid is determined；Test device 4, for being crude oil or natural gas or oil mixing with water in formation fluid
When object, implements drillstem test and determine production information；Completion system 5, for determining completion mode according to the production information.
Wherein, Fractured carbonate strata brill completion system is referred to the above-mentioned Fractured carbonate strata and is drilled well
Method no longer repeats one by one herein.
Herein cited any digital value all include between lower limit value to upper limit value with the lower value of an incremented and
The all values of upper value, there are the intervals of at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity an of component or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is arrived in order to illustrate also clearly listing such as 15 to 85,22 in the specification
68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1.
These are only intended to the example clearly expressed, it is believed that all possibility for the numerical value enumerated between minimum and peak
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all ranges all include all numbers between endpoint and endpoint.It is used together with range
" about " or " approximation " be suitable for two endpoints of the range.Thus, " about 20 to 30 " are intended to cover that " about 20 to about
30 ", including at least the endpoint indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.
Multiple element, ingredient, component or step can be provided by single integrated component, ingredient, component or step.Optionally
Ground, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation.It is used to
The open "a" or "an" for describing element, ingredient, component or step is not said to exclude other elements, ingredient, component
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to appended claims and this
The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special
The disclosure of benefit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as inventor the theme is not thought of as it is disclosed
A part of subject matter.
Claims (10)
1. a kind of Fractured carbonate strata bores completion method characterized by comprising
Protective casing at the top of reservoir and is cemented the well；
Under balance pressure drilling is implemented to Reservoir Section, and monitors formation fluid quantum of output situation；
When monitoring formation fluid quantum of output exception, the fluidity of formation fluid is determined；
When formation fluid is crude oil or natural gas or oil water mixture, implements drillstem test and determine production information；
Completion mode is determined according to the production information；
When the formation fluid is water flooding and quantum of output is greater than predetermined value, implement the decompression that discharges water；
The implementation depressurization step that discharges water includes:
The choke pressure for reducing back-pressure valve allows water flooding nature output using under balance pressure drilling equipment；
In the pressure reduction that discharges water, 300~1000m of every output water flooding3, then closing well asks pressure once to calculate formation pore
Pressure coefficient；Stop the decompression that discharges water when the formation pore pressure coefficient reduces by 0.2 or more, implements described to Reservoir Section implementation
Under balance pressure drilling step；
Reach 10000m in accumulative output water flooding3When, closing well calculates formation pore pressure after seeking pressure；Determining stratum Pore Pressure
When power does not reduce, implements expansion tube and insulate high pressure water layer；Implement after implementing expansion tube packing high pressure water layer described to Reservoir Section
Implement under balance pressure drilling step.
2. Fractured carbonate strata as described in claim 1 bores completion method, which is characterized in that described according to the yield
Information determines that completion mode step includes:
When the production information is higher than the first preset value, using the complete well of open hole packer mode；
When the production information is lower than the second preset value, using the complete well of casing cementing completion mode.
3. Fractured carbonate strata as claimed in claim 2 bores completion method, which is characterized in that described according to the yield
Information determines completion mode step further include:
When the production information is lower than preset value, continue to implement described to Reservoir Section implementation under balance pressure drilling step.
4. Fractured carbonate strata as described in claim 1 bores completion method, which is characterized in that further include:
When monitoring formation fluid quantum of output is not abnormal, using the complete well of casing cementing completion mode.
5. Fractured carbonate strata as described in claim 1 bores completion method, which is characterized in that described to Reservoir Section reality
It applies under balance pressure drilling step, according to the pore pressure in the predicted shaft bottom of target well, drilling fluid density is set, and ensure that shaft bottom is pressed
Power compares the small 1~4MPa of formation pore pressure.
6. Fractured carbonate strata as claimed in claim 5 bores completion method, which is characterized in that described according to target well institute
Predict the mode of the pore pressure in shaft bottom are as follows:
When there is offset well to go into operation, then according to the strata pressure of actual measurement formation pore pressure coefficient prediction target well；
When offset well is not gone into operation, then the strata pressure of target well is predicted according to offset well well-log information.
7. Fractured carbonate strata as claimed in claim 5 bores completion method, which is characterized in that described to Reservoir Section reality
It applies under balance pressure drilling step, back-pressure valve is set in wellhead drilling fluid outlet line and wellhead back pressure is set, to ensure that shaft bottom is pressed
Power and the difference of formation pore pressure are relative constant.
8. Fractured carbonate strata as claimed in claim 7 bores completion method, which is characterized in that
When the wellhead back pressure is more than the half of the rated pressure of well mouth rotary preventer, drilling fluid density is improved to reduce well
Mouth back pressure.
9. Fractured carbonate strata as described in claim 1 bores completion method, which is characterized in that further include:
When the formation fluid is water flooding and quantum of output is less than predetermined value, continue to implement described to Reservoir Section implementation underbalance
Drilling phase.
10. a kind of Fractured carbonate strata bores completion system characterized by comprising
Cementing unit, for protective casing at the top of reservoir and to be cemented the well；
Drilling well monitoring device for implementing under balance pressure drilling to Reservoir Section, and monitors formation fluid quantum of output situation；
Fluidity determining device, for determining the fluidity of formation fluid when monitoring formation fluid quantum of output exception；Describedly
Layer fluid implements the decompression that discharges water for water flooding and when quantum of output is greater than predetermined value；
The implementation depressurization step that discharges water includes:
The choke pressure for reducing back-pressure valve allows water flooding nature output using under balance pressure drilling equipment；
In the pressure reduction that discharges water, 300~1000m of every output water flooding3, then closing well asks pressure once to calculate formation pore
Pressure coefficient；Stop the decompression that discharges water when the formation pore pressure coefficient reduces by 0.2 or more, implements described to Reservoir Section implementation
Under balance pressure drilling step；
Reach 10000m in accumulative output water flooding3When, closing well calculates formation pore pressure after seeking pressure；Determining stratum Pore Pressure
When power does not reduce, implements expansion tube and insulate high pressure water layer；Implement after implementing expansion tube packing high pressure water layer described to Reservoir Section
Implement under balance pressure drilling step；
Test device, for implementing drillstem test and determining production when formation fluid is crude oil or natural gas or oil water mixture
Measure information；
Completion system, for determining completion mode according to the production information.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3796273A (en) * | 1971-10-22 | 1974-03-12 | Global Marine Inc | Underwater well structure |
| US3958639A (en) * | 1974-06-28 | 1976-05-25 | Daniel Arlie H | Method of drilling an oil well to recover casings |
| CN86107208A (en) * | 1985-10-17 | 1987-07-01 | 威廉姆·普尔曼 | Improving one's methods of multiple-stage coal seam fracing |
| CN108222983A (en) * | 2018-03-12 | 2018-06-29 | 太原科技大学 | A kind of column boost-up circuit of hydraulic support |
-
2017
- 2017-10-12 CN CN201710946183.XA patent/CN107724954B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3796273A (en) * | 1971-10-22 | 1974-03-12 | Global Marine Inc | Underwater well structure |
| US3958639A (en) * | 1974-06-28 | 1976-05-25 | Daniel Arlie H | Method of drilling an oil well to recover casings |
| CN86107208A (en) * | 1985-10-17 | 1987-07-01 | 威廉姆·普尔曼 | Improving one's methods of multiple-stage coal seam fracing |
| CN108222983A (en) * | 2018-03-12 | 2018-06-29 | 太原科技大学 | A kind of column boost-up circuit of hydraulic support |
Non-Patent Citations (1)
| Title |
|---|
| 海相油气田超深井完井固井技术;信廷富等;《石油钻采工艺》;20080415(第2期);第14页第1栏第1段-第22页第1栏最后一段 |
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