CN107724954A - 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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- CN107724954A CN107724954A CN201710946183.XA CN201710946183A CN107724954A CN 107724954 A CN107724954 A CN 107724954A CN 201710946183 A CN201710946183 A CN 201710946183A CN 107724954 A CN107724954 A CN 107724954A
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- 238000000034 method Methods 0.000 title claims abstract description 58
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 50
- 238000005553 drilling Methods 0.000 claims abstract description 89
- 239000012530 fluid Substances 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 claims abstract description 34
- 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 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 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
- 239000011800 void material Substances 0.000 claims description 13
- 230000006837 decompression Effects 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 36
- 235000019198 oils Nutrition 0.000 abstract description 33
- 230000004888 barrier function Effects 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 239000000203 mixture Substances 0.000 description 10
- 241001074085 Scophthalmus aquosus Species 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012266 salt solution Substances 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
- 230000009286 beneficial effect Effects 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
- 230000007812 deficiency 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
- 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
- 238000003860 storage Methods 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
- 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
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)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The present invention provides a kind of Fractured carbonate strata and is drilled well method and system, and the Fractured carbonate strata, which bores completion method, to be included：By under protective casing at the top of reservoir and cementing 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.The Fractured carbonate strata of present embodiment, which bores completion method, can solve high salinity complexity oil water relation Fractured carbonate strata because being difficult to accurately identify distribution of oil and water layers by well-log information can not determine the technical barrier of suitable completion mode, suitable for the completion of high salinity complexity oil water relation Fractured carbonate strata.
Description
Technical field
The present invention relates to oil-gas geology 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 technology
During oil-gas exploration and development, it is most important that efficient, safety completion is drilled well operations.Wherein, it is " efficient " to need
To use advanced suitable drilling technology to improve drill footage speed, drillng operation is completed with most fast speed, complete drilling well and make
The maximization of oil and gas production is ensured after industry from suitable well-completing process；" safely " need 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 ensure the well after Completion Operations and completion
Cylinder safety.
In high salinity complexity oil water relation Fractured carbonate strata, because it has complicated oil-water-layer relation,
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 production water
Oil-producing situation.Complex accident is relatively more during this uncertainty causes conventional drilling (overbalance), exists while opens not
With the oil-water-layer of pressure, the narrow Density Window situation of safety drilling be present, drilling well overflow and circulation problems are protruded, even sent out when serious
Raw bit freezing is complicated.Generally use routine Overbalance Drilling operation 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 once the gas in formation fluid after the overflow of stratum
The pressure asked for not is stratum true pressure, improves drilling fluid density or higher than actual formation pressure or less than being practically laminated
Power.If density is too high, leakage complexity occurs, need to further reduce drilling fluid density；If density is too low, continue that overflow occurs
Complexity, it need to further improve drilling fluid density.Therefore the generation spill and leakage conversion that can be continued using conventional drilling mode, influences to bore
Well operations efficiency.
, it is necessary to completion after the completion of drillng operation.Completion refer to uncased wellbore bore reach target well depth after, make shaft bottom and oil reservoir with
The technique that certain fabric connectivity gets up, is that drilling well works last important step, and the beginning of petroleum production engineering.Reasonable selection
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 do not cemented the well and casing cementing completion mode.Do not cement the well
Completion method is divided into barefoot completion, sieve tube completion, open hole packer completion etc. again.The high yield reservoir of usual fracture development is to avoid
High-density cement mortar blocks crack during cased hole completion and space reduces reservoir yield, use the completion mode do not cemented the well more,
And low yield multilayer or oil water relation complicated reservoirs are more using set to meet effectively to insulate water layer or later stage reservoir measures to reform needs
Pipe completion mode.High salinity complexity oil water relation Fractured carbonate strata preferably uses because its oil water relation is complex
Casing cementing completion, but the risk that well cementing operation high-density cement mortar blocks high productivity layer be present；And use the completion side not cemented the well
Method, if selection barefoot completion, sieve tube completion are unfavorable for later stage reservoir measures to reform operation, while the envelope of oil-water-layer is also not implemented
Every；And select open hole packer completion to need by 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, prior art can not effectively solve Fractured carbonate strata under high salinity complexity oil water relation
It is drilled well technical barrier, it is therefore necessary to propose that Fractured carbonate strata is drilled well side under high salinity complexity oil water relation
Method.
The content of the invention
In view of the deficiencies in the prior art, it is an object of the invention 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 patent of the present invention uses is：
A kind of Fractured carbonate strata bores completion method, including：
By under protective casing at the top of reservoir and cementing 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 open hole packer mode completion；
When the production information is less than the second preset value, using casing cementing completion mode completion.
As a preferred embodiment, described determine that completion mode step also includes according to the production information：
When the production information is less than preset value, continue to implement described to implement under balance pressure drilling step to Reservoir Section.
As a preferred embodiment, also include：
When monitoring formation fluid quantum of output is not abnormal, using casing cementing completion mode completion.
As a preferred embodiment, in the implementation under balance pressure drilling step to Reservoir Section, according to target well
The pore pressure in predicted shaft bottom, drilling fluid density is set, and ensures that bottom pressure compares the small 1~4MPa of formation void pressure.
As a preferred embodiment, the mode of the pore pressure that shaft bottom is predicted according to target well is：
When there is offset well to go into operation, then according to the strata pressure of Measured formation 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, in the implementation under balance pressure drilling step to Reservoir Section, in well head drilling well
Liquid outlet line sets back-pressure valve and sets wellhead back pressure, to ensure the poor relative constancy of bottom pressure and formation void pressure.
As a preferred embodiment, exceed 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, also include：
When the formation fluid is stratum water and quantum of output is more than predetermined value, implement the decompression that discharges water.
As a preferred embodiment, the implementation discharges water, depressurization step includes：
The choke pressure of back-pressure valve is reduced, stratum water nature output is allowed using under balance pressure drilling equipment.
As a preferred embodiment, in the pressure reduction that discharges water, per output stratum 300~1000m of water3,
Then closing well seeks pressure once to calculate formation void pressure coefficient；Stop discharging water when the reservoir pressure coefficient reduces by more than 0.2
Decompression, implement described to Reservoir Section implementation under balance pressure drilling step.
As a preferred embodiment, also include：
On accumulative output stratum, water reaches 10000m3When, closing well calculates formation void pressure after seeking pressure；It is determined that earth bore
When gap pressure does not reduce, implement expansion tube packing high pressure water layer；Implement described pair of storage after expansion tube packing high pressure water layer is implemented
Interval implements under balance pressure drilling step.
As a preferred embodiment, also include：
When the formation fluid is that stratum water and quantum of output are less than predetermined value, continue to implement it is described Reservoir Section is implemented it is deficient
Balanced drilling step.
A kind of Fractured carbonate strata bores completion system, including：
Cementing unit, for by under protective casing at the top of reservoir and cementing the well；
Drilling well monitoring device, for implementing under balance pressure drilling to Reservoir Section, and monitor formation fluid quantum of output situation；
Fluidity determining device, for when monitoring formation fluid quantum of output exception, determining the fluidity of formation fluid；
Test device, for when formation fluid is crude oil or natural gas or oil water mixture, it is true to implement drillstem test
Determine production information；
Completion system, for determining completion mode according to the production information.
Beneficial effect：
By above description as can be seen that the Fractured carbonate strata of present embodiment bores completion method by 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
Breath 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 barrier, suitable for the completion of high salinity complexity oil water relation Fractured carbonate strata.
With reference to following explanation and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, specifies the original of the present invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms that profit 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
Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those skilled in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is that a kind of Fractured carbonate strata of one embodiment of the present invention offer is drilled well method flow diagram；
Fig. 2 is that a kind of Fractured carbonate strata of one embodiment of the present invention offer is drilled well method flow diagram；
Fig. 3 is the case casing programme schematic diagram using Fig. 2；
Fig. 4 is that a kind of Fractured carbonate strata of one embodiment of the present invention offer is drilled well system schematic.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained on the premise of creative work is not made, should all belong to guarantor of the present invention
The scope of shield.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein 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
The arbitrary and all combination of related Listed Items.
Fig. 1, Fig. 2 are referred to, one embodiment of the present invention provides a kind of Fractured carbonate strata and bores completion method, splits
Stitch acid carbonate stratum and bore the well completion work that completion method is applied under high salinity complexity oil water relation.Specifically, the crack
Bore completion method and comprise the following steps in acid carbonate stratum：
S10, by under protective casing at the top of reservoir and cementing 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 monitor 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.
In the implementation under balance pressure drilling step to Reservoir Section, the pore pressure in shaft bottom is predicted according to target well, if
Drilling fluid density is put, and ensures that bottom pressure compares the small 1~4MPa of formation void pressure.
The mode of the pore pressure that shaft bottom is predicted according to target well is：When there is offset well to go into operation, then according to reality
The strata pressure of geodetic stressor layer coefficient prediction target well；When offset well is not gone into operation, then target is predicted according to offset well well-log information
The strata pressure of well.
In the implementation under balance pressure drilling step to Reservoir Section, back-pressure valve is set in wellhead drilling fluid outlet line and set
Wellhead back pressure (back-pressure valve can set choke pressure) is put, to ensure the poor relative constancy of bottom pressure and formation void pressure.
When exceeding the half of the rated pressure of well mouth rotary preventer in the wellhead back pressure, improve drilling fluid density and returned with reducing well head
Pressure.
In this way, in step S20, formation fluid flows into pit shaft under differential pressure action and with circulation of drilling fluid to ground
Face, into oil gas water separator, and formation fluid is monitored by sensor device and overflows situation (quantum of output situation).Wherein, pass
Sensor equipment can be gas-monitoring sensing equipment, hydro carbons position monitoring sensor, chlorine root monitoring sensor etc..
S30, when monitoring formation fluid quantum of output exception, determine the fluidity of formation fluid；
In this step, when judging that the quantum of output (or spill-out) of formation fluid is abnormal, can in units of the time output
Trend that measurer is significantly increased (for example the quantum of output of unit interval 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 fluid allowed in usual stratum can be water, is oil, be gas, when liquid and the drilling well in drilling process
Liquid (generally water-base drilling fluid) mixes, it is difficult to judges the fluid of stratum out for which kind of fluid.By oil and gas and water
From rear, oil, gas, drilling fluid can be collected into respectively, then can distinguish in stratum out for which kind of fluidity.Wherein, ground laminar flow
The fluidity of body is usually stratum water (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 determine yield believe
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 tester of tripping in immediately, the passage on oil gas outflow ground, the bore hole in drilling well midway are done using drilling rod
The test carried out in well (section).
S50, completion mode determined according to the production information.
In this step, when the production information is higher than the first preset value, using open hole packer mode completion；Or
Person, when the production information is less than the second preset value, using casing cementing completion mode completion.Wherein, believe in the yield
Breath may determine that this well is high-yield well when being higher than the first preset value, illustrates reservoir fissure development, now fractured-vuggy reservoir, should use
Open hole packer completion mode completion.The open hole packer completion mode completion can be by external packer of pipe and sleeve pipe point
The mode of section completion carries out completion.
It is stripper well that this is may determine that when production information is less than the second preset value, is not fractured-vuggy reservoir, in this way, can
To use casing cementing completion mode completion in time according to geological reservoir requirement.The casing cementing completion mode completion 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, i.e. on ground
Well of the yield of layer fluid higher than 50 tpds is high yield, is then low yield less than 5 tons.
In a further embodiment, in the production information, less than preset value, (preset value can be preset with above-mentioned second
Be worth it is identical, can also be different) when, completion (than such as above-mentioned casing cementing completion mode completion) can be selected, can also be without
Completion and selecting continues 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 bores completion method by 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
Breath 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 barrier, suitable for the completion of 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 profit
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 relation Fractured carbonate strata
The low technical barrier of overflow leakage conversion caused by situation, drillng operation efficiency.
In one embodiment, the Fractured carbonate strata bores completion method and can also included：In monitoring ground laminar flow
When body quantum of output is not abnormal, using casing cementing completion mode completion.Specifically, the completion step can be according to drill footage situation
And geological reservoir requirement uses casing cementing completion mode completion in time.
In one embodiment, the Fractured carbonate strata bores completion method and can also comprised the following steps：S41、
When the formation fluid is stratum water and quantum of output is more than predetermined value, implement the decompression that discharges water.Other, described Fractured carbon
Completion method is bored on hydrochlorate stratum can also include step：S42, in the formation fluid it is that stratum water and quantum of output are less than predetermined value
When, continue to implement described to implement under balance pressure drilling step to Reservoir Section.
The implementation depressurization step that discharges water includes：The choke pressure of back-pressure valve is reduced, allows 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 polluting environment.
In the pressure reduction that discharges water, per output stratum 300~1000m of water3, then closing well, which is asked, presses once to calculate stratum
Pore pressure coefficient.Stop the decompression that discharges water when the reservoir pressure coefficient reduces by more than 0.2, implement described to Reservoir Section implementation
Under balance pressure drilling step.
In addition, it is determined that strata pressure do not decline predetermined amplitude (during than such as above-mentioned 0.2), the crack acid carbonate
Layer, which bores completion method, can also include step：On accumulative output stratum, water reaches 10000m3When, closing well calculates stratum sky after seeking pressure
Gap pressure；When it is determined that formation pore pressure does not reduce, implement expansion tube packing high pressure water layer；Implementing expansion tube packing high pressure
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.
Refer to Fig. 2, Fig. 3, case block (in general drilling process, often gets into a depthkeeping using three body structures that drive a well more
After degree, in order to ensure subsequent well safety, it is necessary to which next layer of sleeve pipe and the stratum bored out with cement sealing, prevent the borehole wall from collapsing
Collapse, leakage, overflow accident complexity.The drill bit of each size bores deep and tripping in correspondingly-sized sleeve pipe, and being so referred to as one opens
It is secondary, and the size of a upper beginning is bigger than the next size opened time.Minimum in usual drilling well to start for 2, i.e., two open,
It may at most be opened using 7-8.Domestic generally use 3 is opened, and is at most opened using 5), an exploitation is drilled under 1600m with 311.2mm drill bits
Enter 244.5mm sleeve pipes, cementing slurry returns to ground；Two exploitations are drilled into tripping in 177.8mm skills at the top of reservoir with 215.9mm drill bits
Art sleeve pipe 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.
Opened in case well shown in Fig. 3 three after Reservoir Section spuds in, implement under balance pressure drilling.According to the prediction of offset well drilling well
Reservoir pressure coefficient is 1.75, considers the influence of differential pressure, casing annulus drilling fluid frictional resistance, wellhead back pressure, and setting is bored
Well liquid 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 neighbour
Well the Measured formation pressure of brought in well, offset well drilled well Reservoir Section drilling fluid density, completion well-log information.
In underbalance operation process is implemented, back-pressure valve is set in wellhead drilling fluid outlet line and choke pressure is set,
Also referred to as wellhead back pressure, to ensure the poor relative constancy of bottom pressure and formation void pressure.If wellhead back pressure exceedes well mouth rotary
During 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, formation fluid is monitored by sensor device and overflowed
Situation.
In drilling process, if monitoring formation fluid quantum of output exception, i.e., the quantum of output of unit interval 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 solution, crude oil, oil water mixture.
If the fluidity of stratum production fluid that may be present is salt solution in case well, and spillway discharge (quantum of output) is larger, according to
When the drilling well density of back pressure lifting result in leakage situation, then implement waterproof decompression technique.Otherwise (the less situation of spillway discharge)
Continue to implement under balance pressure drilling.
The described decompression technique that discharges water, refer to use former under balance pressure drilling equipment, the appropriate throttling for reducing wellhead back pressure valve
Pressure, allows stratum water nature output, and ground need to carry out the disposing task of output water, avoids polluting environment.
In the pressure reduction that discharges water, per output stratum 300~1000m of water3, closing well, which is asked, presses once, calculates formation void pressure
Force coefficient, if reservoir pressure coefficient reduces by more than 0.2, stop the decompression technique that discharges water, continue to return and implement under balance pressure drilling work
Industry.
When reservoir pressure coefficient reduces and is less than 0.2, if accumulative output stratum water reaches 10000m3, closing well ask pressure after count
Calculate formation void pressure does not reduce yet, then implements expansion tube packing water under high pressure layer process.After completing the packing of high pressure water layer, continue
Implement under balance pressure drilling technique.
It is real if the fluidity of stratum production fluid that may be present is crude oil or natural gas or oil water mixture in case well
Apply drillstem test technique.When it is high yield that drillstem test, which seeks postpartum yield, illustrate reservoir fissure development, S6B bore holes should be used to seal
Every device completion mode completion.When it is low yield that drillstem test, which seeks postpartum yield, it is determined whether completion, however, it is determined that not completion then after
It is continuous that drilling well is continued using under-balance drilling operation.In addition, sleeve pipe can also be used according to geological reservoir requirement in time in low yield
Well cementation completion mode completion.
When formation fluid quantum of output abnormal conditions being not present in case well drilling process, it is determined whether completion.True
Surely need that casing cementing completion mode completion can be used in time according to drill footage situation and geological reservoir requirement during completion.
By that with upper type, 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, which also provides a kind of Fractured carbonate strata, bores completion system, bag
Include：Cementing unit 1, for by under protective casing at the top of reservoir and cementing 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
During thing, implement 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 repeat one by one herein.
Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and
The all values of upper value, the interval of at least two units between any lower value and any much higher value be present.For example, such as
Fruit elaborates that the quantity of part 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 to illustrate that such as 15 to 85,22 are also clearly listed in the specification arrives
68th, 43 to 51,30 to 32 is equivalent.For the value less than 1, it is 0.0001,0.001,0.01,0.1 suitably to think a unit.
These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all scopes all include all numerals between end points and end points.It is used together with scope
" about " or " approximation " be suitable for two end points of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", including at least the end points indicated.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describe the term " substantially by ... forms " of combination should include determined by element, composition, part or step and reality
Other elements, composition, part or the step of the basic novel feature of the combination are not influenceed in matter.Using term "comprising" or
" comprising " describes the combination of element here, composition, part or step it is also contemplated that substantially by these elements, composition, part
Or the embodiment that step is formed.Here by using term " can with ", it is intended to which illustrate that " can with " include is described any
Attribute is all optional.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
State, many embodiments and many applications outside the example provided all will be aobvious and easy for a person skilled in the art
See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to appended claims and this
The four corner of the equivalent that a little claims are possessed determines.It is for comprehensive purpose, all articles and special with reference to including
The disclosure of profit 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 for subject matter.
Claims (14)
1. a kind of Fractured carbonate strata bores completion method, it is characterised in that including：
By under protective casing at the top of reservoir and cementing 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.
2. Fractured carbonate strata as claimed in claim 1 bores completion method, it is characterised 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 open hole packer mode completion；
When the production information is less than the second preset value, using casing cementing completion mode completion.
3. Fractured carbonate strata as claimed in claim 2 bores completion method, it is characterised in that described according to the yield
Information determines that completion mode step also includes：
When the production information is less than preset value, continue to implement described to implement under balance pressure drilling step to Reservoir Section.
4. Fractured carbonate strata as claimed in claim 1 bores completion method, it is characterised in that also includes：
When monitoring formation fluid quantum of output is not abnormal, using casing cementing completion mode completion.
5. Fractured carbonate strata as claimed in claim 1 bores completion method, it is characterised in that described real to Reservoir Section
Apply under balance pressure drilling step, the pore pressure in shaft bottom is predicted according to target well, drilling fluid density is set, and ensure that shaft bottom is pressed
Power compares the small 1~4MPa of formation void pressure.
6. Fractured carbonate strata as claimed in claim 5 bores completion method, it is characterised in that described according to target well institute
The mode of pore pressure for predicting shaft bottom is：
When there is offset well to go into operation, then according to the strata pressure of Measured formation 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, it is characterised in that described real to Reservoir Section
Apply 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
The poor relative constancy of power and formation void pressure.
8. Fractured carbonate strata as claimed in claim 7 bores completion method, it is characterised in that
When exceeding the half of the rated pressure of well mouth rotary preventer in the wellhead back pressure, drilling fluid density is improved to reduce well
Mouth back pressure.
9. Fractured carbonate strata as claimed in claim 1 bores completion method, it is characterised in that also includes：
When the formation fluid is stratum water and quantum of output is more than predetermined value, implement the decompression that discharges water.
10. Fractured carbonate strata as claimed in claim 9 bores completion method, it is characterised in that described to implement the drop that discharges water
Pressure step includes：
The choke pressure of back-pressure valve is reduced, stratum water nature output is allowed using under balance pressure drilling equipment.
11. Fractured carbonate strata as claimed in claim 10 bores completion method, it is characterised in that
In the pressure reduction that discharges water, per output stratum 300~1000m of water3, then closing well, which is asked, presses once to calculate formation void
Pressure coefficient；Stop the decompression that discharges water when the reservoir pressure coefficient reduces by more than 0.2, implement described deficient to Reservoir Section implementation flat
Weigh drilling phase.
12. Fractured carbonate strata as claimed in claim 11 bores completion method, it is characterised in that also includes：
On accumulative output stratum, water reaches 10000m3When, closing well calculates formation void pressure after seeking pressure；It is determined that stratum Pore Pressure
When power does not reduce, implement expansion tube packing high pressure water layer；Implement after expansion tube packing high pressure water layer is implemented described to Reservoir Section
Implement under balance pressure drilling step.
13. Fractured carbonate strata as claimed in claim 1 bores completion method, it is characterised in that also includes：
When the formation fluid is that stratum water and quantum of output are less than predetermined value, continue to implement described to Reservoir Section implementation underbalance
Drilling phase.
14. a kind of Fractured carbonate strata bores completion system, it is characterised in that including：
Cementing unit, for by under protective casing at the top of reservoir and cementing the well；
Drilling well monitoring device, for implementing under balance pressure drilling to Reservoir Section, and monitor formation fluid quantum of output situation；
Fluidity determining device, for when monitoring formation fluid quantum of output exception, determining the fluidity of formation fluid；
Test device, production is determined for when formation fluid is crude oil or natural gas or oil water mixture, implementing drillstem test
Measure information；
Completion system, for determining completion mode according to the production information.
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| 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 |
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