CN110005402A - The calculation method and device of carbonate rock oil well producing pressure differential - Google Patents
The calculation method and device of carbonate rock oil well producing pressure differential Download PDFInfo
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- CN110005402A CN110005402A CN201711469805.0A CN201711469805A CN110005402A CN 110005402 A CN110005402 A CN 110005402A CN 201711469805 A CN201711469805 A CN 201711469805A CN 110005402 A CN110005402 A CN 110005402A
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- 239000003129 oil well Substances 0.000 title claims abstract description 66
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 53
- 239000011435 rock Substances 0.000 title claims abstract description 53
- 238000004364 calculation method Methods 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 330
- 239000007924 injection Substances 0.000 claims abstract description 330
- 230000001186 cumulative effect Effects 0.000 claims abstract description 112
- 239000012530 fluid Substances 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000009825 accumulation Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000003921 oil Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007789 sealing 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The embodiment of the present invention provides the calculation method and device of a kind of carbonate rock oil well producing pressure differential, this method comprises: the well head pressure before measurement injection fluid；Into carbonate rock oil well inject fluid when, measure the fluid cumulative injection and the first injection pressure corresponding with the cumulative injection；First injection pressure is the injection pressure after the fluid for injecting the cumulative injection；According to the well head pressure, the cumulative injection and first injection pressure, producing pressure differential is calculated；Wherein, difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).The embodiment of the present invention can reduce the cost of producing pressure differential calculating.
Description
Technical field
The present embodiments relate to oil extraction in oil field field of engineering technology more particularly to a kind of carbonate rock oil well producing pressure differentials
Calculation method and device.
Background technique
Individual well water filling may be implemented for oil in carbonate rock oil well, when oil well energy abundance, is able to carry out self-spray production, when
When oil well energy deficiency, stewing well can be carried out by modes such as water filling or gas injections and replaces crude oil production.
Currently, being usually to determine the need for water filling or gas injection into oil well according to producing pressure differential.Due to working as stratum
When pressure is greater than saturation pressure, nearly well area degassing is unobvious, and when stratum average pressure level is higher, reservoir does not occur not
Reversible plastic deformation, therefore, reasonable producing pressure differential should be less than critical producing pressure drop, and in the pressure differential range, oil well is produced
Amount stablizes the rate of oil production, it can be achieved that certain.Therefore, how producing pressure differential is fast and accurately calculated, be very important.It is existing
In technology, the flowing bottomhole pressure (FBHP) measured usually is subtracted according to the strata pressure measured, to calculate producing pressure differential.
However, the mode of above-mentioned calculating producing pressure differential, due to needing to measure strata pressure and flowing bottomhole pressure (FBHP), and shaft bottom is flowed
Pressure needs to go into the well and is monitored, therefore, it is necessary to expend biggish man power and material so that calculate the cost of producing pressure differential compared with
It is high.
Summary of the invention
The embodiment of the present invention provides the calculation method and device of a kind of carbonate rock oil well producing pressure differential, can reduce calculating
The cost of producing pressure differential.
In a first aspect, the embodiment of the present invention provides a kind of calculation method of carbonate rock oil well producing pressure differential, comprising:
Well head pressure before measurement injection fluid；
Into carbonate rock oil well inject fluid when, measure the fluid cumulative injection and with the accumulation
Corresponding first injection pressure of injection rate；First injection pressure is the injection pressure after the fluid for injecting the cumulative injection
Power；
According to the well head pressure, the cumulative injection and first injection pressure, producing pressure differential is calculated；Wherein,
Difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).
Optionally, described according to the well head pressure, the cumulative injection and first injection pressure, calculate production
Pressure difference, comprising:
Judge whether in a linear relationship between the cumulative injection and first injection pressure；
If in a linear relationship between the cumulative injection and first injection pressure, according to the cumulative injection
With first injection pressure, the second injection pressure when influent stream body is infused on stratum is determined；
According to second injection pressure and the well head pressure, the producing pressure differential is calculated.
Optionally, described according to second injection pressure and the well head pressure, calculate the producing pressure differential, comprising:
According to formula Δ P=(P1-P2)/2 calculate the producing pressure differential；
Wherein, Δ P is the producing pressure differential, P1For second injection pressure, P2For the well head pressure.
Optionally, described to judge whether in a linear relationship between the cumulative injection and first injection pressure, packet
It includes:
Injection curve is drawn according to the cumulative injection and first injection pressure；
Judge whether linearly close between the cumulative injection and first injection pressure according to the injection curve
System.
Optionally, described according to the cumulative injection and first injection pressure, it determines when influent stream body is infused on stratum
Second injection pressure, comprising:
According to the cumulative injection and first injection pressure, the intercept of the injection curve is calculated；
The intercept is determined as second injection pressure.
Second aspect, the embodiment of the present invention provide a kind of computing device of carbonate rock oil well producing pressure differential, comprising:
Measurement module, for measuring the well head pressure before injecting fluid；
The measurement module is also used to measure the accumulation note of the fluid when injecting fluid into carbonate rock oil well
Enter amount and the first injection pressure corresponding with the cumulative injection；First injection pressure is to inject the accumulation note
Injection pressure after entering the fluid of amount；
Computing module, for calculating life according to the well head pressure, the cumulative injection and first injection pressure
Produce pressure difference；Wherein, difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).
Optionally, the computing module, comprising:
Judging submodule, for judging whether linearly close between the cumulative injection and first injection pressure
System；
Determine submodule, when being used in a linear relationship between the cumulative injection and first injection pressure, root
According to the cumulative injection and first injection pressure, the second injection pressure when influent stream body is infused on stratum is determined；
Computational submodule, for calculating the producing pressure differential according to second injection pressure and the well head pressure.
Optionally, the computational submodule, is specifically used for:
According to formula Δ P=(P1-P2)/2 calculate the producing pressure differential；
Wherein, Δ P is the producing pressure differential, P1For second injection pressure, P2For the well head pressure.
Optionally, the judging submodule, is specifically used for:
Injection curve is drawn according to the cumulative injection and first injection pressure；
Judge whether linearly close between the cumulative injection and first injection pressure according to the injection curve
System.
Optionally, the determining submodule, is specifically used for:
According to the cumulative injection and first injection pressure, the intercept of the injection curve is calculated；
The intercept is determined as second injection pressure.
The calculation method and device of carbonate rock oil well producing pressure differential provided by the invention, before injecting fluid by measurement
Well head pressure measures the cumulative injection of the fluid and injects with accumulation when injecting fluid into carbonate rock oil well
Corresponding first injection pressure is measured, which is the injection pressure after the fluid for injecting cumulative injection, and according to
Well head pressure, cumulative injection and the first injection pressure calculate producing pressure differential；Wherein, which is strata pressure and well
Difference between underflow pressure.Due to only needing the cumulative injection and the first injection pressure of shaft mouth test pressure, injection fluid,
Producing pressure differential can be quickly calculated, the phenomenon that needing lower well measurements flowing bottomhole pressure (FBHP) in the prior art is avoided, thus not only may be used
To reduce the cost for calculating producing pressure differential, and the efficiency for calculating producing pressure differential can be improved.
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 this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is that the process of the calculation method embodiment one of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is that the process of the calculation method embodiment two of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to；
Fig. 3 is the schematic diagram for the injection curve drawn according to cumulative injection and the first injection pressure；
Fig. 4 is that the structure of the computing device embodiment one of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to；
Fig. 5 is that the structure of the computing device embodiment two of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Before description of specific embodiments of the present invention, first just some basic concepts are explained:
(1) well Chu Xiaoying
Well storage effect refers to the fluid (oil, gas) in wellbore system, due to wellbore pressure variation and generate elastic energy
Release or the caused well yield (bottom pressure) of aggregation variation.Before oil well opening well and making production, pit shaft is sealing,
Fluid in pit shaft is in high-pressure elastomeric contraction state.Once opening well and making production, the fluid in pit shaft releases immediately elastic energy.Cause
This, the yield that well head obtains first does not come from stratum, but the elastic expansion amount from upper wellbore fluid.
(2) afterflow effect
After oil well surface shut-in, underground still has oil stream to continue to flow into wellbore from stratum, and this phenomenon is known as afterflow.
(3) producing pressure differential
For water injection well, producing pressure differential refers to that flowing bottomhole pressure (FBHP) subtracts the pressure value that strata pressure obtains, for oil well
For, producing pressure differential refers to that strata pressure subtracts the pressure value that flowing bottomhole pressure (FBHP) obtains.
The calculation method of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is applied to carbonate rock oil well
In.Individual well water filling may be implemented for oil in carbonate rock oil well, when oil well energy abundance, is able to carry out self-spray production, works as oil well
When energy deficiency, stewing well can be carried out by modes such as water filling or gas injections and replaces crude oil production.Currently, being usually to be pressed according to production
Difference determines the need for into oil well therefore how water filling or gas injection fast and accurately calculate producing pressure differential, for improving
Rate of oil production is realized stable oil well output, is very important.In the prior art, it calculates and gives birth to generally according to two ways
Pressure difference is produced, one is the flowing bottomhole pressure (FBHP) measured is subtracted according to the strata pressure measured, to calculate producing pressure differential.Another kind is
Producing pressure differential is calculated according to oil well productivity formula Q=J △ P, wherein Q is oil well output, and J is to adopt liquid (oil) index, △ P
For producing pressure differential.However, need to measure strata pressure and flowing bottomhole pressure (FBHP) when calculating producing pressure differential by former mode, and
Flowing bottomhole pressure (FBHP) needs, which are gone into the well, to be monitored, and needs to expend a large amount of man power and material, so that the higher cost of producing pressure differential is calculated,
It is more complex due to adopting liquid (oil) index J when latter approach calculates producing pressure differential, during J is calculated, it is also desirable to consume
Take a large amount of time, thus causes the efficiency for calculating producing pressure differential lower.
Therefore, the calculation method of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention, it is intended to solve existing skill
When calculating producing pressure differential in art, higher cost and the lower technical problem of computational efficiency.
The embodiment of the present invention considers these situations, proposes a kind of calculation method of carbonate rock oil well producing pressure differential, leads to
Well head pressure before crossing measurement injection fluid measures the accumulation note of the fluid when injecting fluid into carbonate rock oil well
Enter amount and the first injection pressure corresponding with cumulative injection, which is to inject the fluid of cumulative injection
Injection pressure afterwards, and according to well head pressure, cumulative injection and the first injection pressure, calculate producing pressure differential；Wherein, the production
Difference of the pressure difference between strata pressure and flowing bottomhole pressure (FBHP).Due to the accumulation injection for only needing shaft mouth test pressure, injecting fluid
Amount and the first injection pressure, can quickly calculate producing pressure differential, avoid and lower well measurements shaft bottom is needed to flow in the prior art
Thus the phenomenon that pressure, can not only reduce the cost for calculating producing pressure differential, but also the efficiency for calculating producing pressure differential can be improved.
Technical solution of the present invention is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
Fig. 1 is that the process of the calculation method embodiment one of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to.The embodiment of the invention provides a kind of calculation method of carbonate rock oil well producing pressure differential, this method can be by arbitrarily holding
The device of the calculation method of row carbonate rock oil well producing pressure differential executes, which can pass through software and or hardware realization.
As shown in Figure 1, the method for the present embodiment may include:
Well head pressure before step 101, measurement injection fluid.
It when producing pressure differential is greater than critical producing pressure drop, needs to inject fluid into carbonate rock oil well, to reduce production
Pressure difference.In the present embodiment, the computing device of carbonate rock oil well producing pressure differential is when calculating producing pressure differential, it is necessary first to measure
Well head pressure before injecting fluid can measure well head pressure, example by pressure sensor in one possible implementation
It can such as be measured by oil pressure gauge.
In addition, fluid for example can be water or gas, such as natural gas, nitrogen, carbon dioxide inert gas may be used also certainly
Think that other can change the fluid of producing pressure differential.
Step 102, into carbonate rock oil well inject fluid when, measure fluid cumulative injection and with accumulation
Corresponding first injection pressure of injection rate, first injection pressure are the injection pressure after the fluid for injecting cumulative injection.
In embodiments of the present invention, it after measuring the well head pressure before injection fluid, is infused into carbonate rock oil well
When entering fluid, it will the first injection pressure after measuring the cumulative injection of the fluid and the fluid of injection cumulative injection,
Wherein, since cumulative injection be injecting fluid to the Fluid Volume injected in total when measurement.In a kind of possible implementation
In, the cumulative injection of fluid can be measured by flow sensor, such as can measure by flowmeter, can pass through
Pressure sensor measures the first injection pressure, such as can be measured by oil pressure gauge, it is, of course, also possible to pass through others
Flow sensor measures cumulative injection, the first injection pressure is measured by other pressure sensors, for flow sensor
With the concrete form of pressure sensor, the embodiment of the present invention is not specifically limited.
Step 103, according to well head pressure, cumulative injection and the first injection pressure, calculate producing pressure differential；Wherein, it produces
Difference of the pressure difference between strata pressure and flowing bottomhole pressure (FBHP).
It in embodiments of the present invention, can be with after measuring well head pressure, cumulative injection and the first injection pressure
Producing pressure differential is calculated according to well head pressure, cumulative injection and the first injection pressure.In this way, staff can be according to meter
The producing pressure differential of calculating determines the need for injecting fluid into carbonate rock oil well, to guarantee the speed recovered the oil.
The calculation method of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention, before injecting fluid by measurement
Well head pressure measures the cumulative injection of the fluid and injects with accumulation when injecting fluid into carbonate rock oil well
Corresponding first injection pressure is measured, which is the injection pressure after the fluid for injecting cumulative injection, and according to
Well head pressure, cumulative injection and the first injection pressure calculate producing pressure differential；Wherein, which is strata pressure and well
Difference between underflow pressure.Due to only needing the cumulative injection and the first injection pressure of shaft mouth test pressure, injection fluid,
Producing pressure differential can be quickly calculated, the phenomenon that needing lower well measurements flowing bottomhole pressure (FBHP) in the prior art is avoided, thus not only may be used
To reduce the cost for calculating producing pressure differential, and the efficiency for calculating producing pressure differential can be improved.
Fig. 2 is that the process of the calculation method embodiment two of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to.On the basis of embodiment shown in Fig. 1 of the embodiment of the present invention, to according to well head pressure, cumulative injection and the first injection
Pressure, the embodiment for calculating producing pressure differential are described in detail.As shown in Fig. 2, the method for the present embodiment may include:
Well head pressure before step 201, measurement injection fluid.
Step 202, into carbonate rock oil well inject fluid when, measure fluid cumulative injection and with accumulation
Corresponding first injection pressure of injection rate；First injection pressure is the injection pressure after the fluid for injecting cumulative injection.
Step 201- step 202 is similar with step 101- step 102, and details are not described herein again.
Step 203, judge it is whether in a linear relationship between cumulative injection and the first injection pressure.
In embodiments of the present invention, due to starting to inject just during injecting fluid into carbonate rock oil well
When, there can be compression process, at this point, being that non-linear relation is presented between cumulative injection and the first injection pressure, be flowed in injection
Body for a period of time after, linear relationship can be presented between cumulative injection and the first injection pressure.In the present embodiment, according to accumulation
Injection rate and the first injection pressure are in cumulative injection and first when determining the second injection pressure when influent stream body is infused on stratum
It is calculated under the premise of linear relationship is presented between injection pressure, therefore, it is necessary first to judge during injecting fluid,
Whether linear relationship is presented between cumulative injection and the first injection pressure.
In one possible implementation, judge whether linearly close between cumulative injection and the first injection pressure
System, comprising: injection curve is drawn according to cumulative injection and the first injection pressure, according to injection curve judge cumulative injection with
It is whether in a linear relationship between first injection pressure.
Specifically, Fig. 3 is the schematic diagram for the injection curve drawn according to cumulative injection and the first injection pressure, such as Fig. 3
It is shown, cumulative injection pair of the computing device of carbonate rock oil well producing pressure differential measuring cumulative injection and with each stage
After the value for the first injection pressure answered, injection curve can be drawn out according to the two values.Those skilled in the art can manage
Solution, draw out injection curve after, can according to injection curve judge be between cumulative injection and the first injection pressure
It is no in a linear relationship, such as: may determine that whether the slope of any two point on injection curve is equal, if equal, illustrates tired
It is in a linear relationship between product injection rate and corresponding first injection pressure.
In addition, as shown in figure 3, being that nonlinear dependence is presented in compression stage, between cumulative injection and the first injection pressure
System, after injecting fluid for a period of time, linear relationship can just be presented between cumulative injection and the first injection pressure.
If in a linear relationship between step 204, cumulative injection and the first injection pressure, according to cumulative injection and
One injection pressure determines the second injection pressure when influent stream body is infused on stratum.
In embodiments of the present invention, judging in a linear relationship between cumulative injection and the first injection pressure, then root
According to cumulative injection and the first injection pressure, the second injection pressure when influent stream body is infused on stratum is determined.
In one possible implementation, according to cumulative injection and the first injection pressure, determine that influent stream body is infused on stratum
When the second injection pressure, comprising: according to cumulative injection and the first injection pressure, the intercept of injection curve is calculated, by intercept
It is determined as the second injection pressure.
Specifically, after drawing out injection curve, according to cumulative injection and the first injection pressure, note can be calculated
Enter the intercept of curve.Such as: assuming that injection curve is y=kx+b, wherein y is the first injection pressure, and x is cumulative injection, k
To inject slope of a curve, it will be understood by those skilled in the art that arbitrarily taking the cumulative injection at two moment and corresponding
First injection pressure can calculate the intercept of injection curve according to equation y=kx+b.
After the intercept for calculating injection curve, calculated intercept is determined as the second injection pressure.
Step 205, according to the second injection pressure and well head pressure, calculate producing pressure differential.
In embodiments of the present invention, well head pressure is the well head pressure before injecting fluid, carbonate rock oil well production pressure
The computing device of difference is calculating the second injection pressure, and after measuring well head pressure, can according to the second injection pressure and
Well head pressure calculates producing pressure differential.
In one possible implementation, according to the second injection pressure and well head pressure, producing pressure differential, including root are calculated
According to formula Δ P=(P1-P2)/2 calculate producing pressure differential, wherein Δ P is producing pressure differential, P1For the second injection pressure, P2For well head
Pressure.
Specifically, it is illustrated so that the fluid of injection is water as an example below, injects the process of gas and the process class of injection water
Seemingly, details are not described herein again.Assuming that water filling and production are reversible, that is, production pressure when producing pressure differential △ P=when producing is filled the water
Poor △ P, wherein producing pressure differential △ P when production is that strata pressure subtracts flowing bottomhole pressure (FBHP), and producing pressure differential △ P when water filling is well
Underflow pressure subtracts strata pressure, in addition, ignoring well storage effect and afterflow effect.
In addition, because having ignored afterflow effect, therefore subterranean formation production is 0 when closing well, that is, meets relational expression below:
Q=J* (P- △ P-Pwf)=0 (1)
Wherein, Q is quantum of output, and P is initial formation pressure, and △ P is producing pressure differential, PwfFor current flowing bottomhole pressure (FBHP).
In addition, because having ignored well Chu Xiaoying, therefore the water for starting stratum when water filling is 0, that is, meets relational expression below:
Qinjw=J* (Pwf'-△ P-P)=0 (2)
Wherein, QinjwFor the injection rate of fluid, such as the injection rate of water or gas, Pwf' it is the flowing bottomhole pressure (FBHP) injected after fluid, △
P is producing pressure differential, and P is initial formation pressure.
Following formula (3) can be obtained by above-mentioned (1) and (2):
Pwf′-Pwf=2 △ P (3)
In addition, due to Pwf'=PH+P1, Pwf=PH+P2, wherein PHIt therefore can be obtained according to formula (3) for head of liquid
To following formula (4):
Δ P=(P1-P2)/2 (4)
It can be seen from the above, calculating the second injection pressure, and after measuring well head pressure, according to formula (4)
Calculate producing pressure differential.When mode in through this embodiment calculates producing pressure differential, only need to by the cumulative injection of fluid and
Corresponding first injection pressure can calculate the second injection pressure according to injection slope of a curve, and quickly be calculated with this
Producing pressure differential, it is possible thereby to avoid having to monitoring flowing bottomhole pressure (FBHP) by going into the well come the phenomenon that calculating producing pressure differential, thus not only
The cost of producing pressure differential calculating can be reduced, and the efficiency for calculating producing pressure differential can be improved.
The calculation method of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention, before injecting fluid by measurement
Well head pressure measures the cumulative injection of the fluid and injects with accumulation when injecting fluid into carbonate rock oil well
Corresponding first injection pressure is measured, which is the injection pressure after the fluid for injecting cumulative injection, and according to
Well head pressure, cumulative injection and the first injection pressure calculate producing pressure differential；Wherein, which is strata pressure and well
Difference between underflow pressure.Due to only needing the cumulative injection and the first injection pressure of shaft mouth test pressure, injection fluid,
Producing pressure differential can be quickly calculated, the phenomenon that needing lower well measurements flowing bottomhole pressure (FBHP) in the prior art is avoided, thus not only may be used
To reduce the cost for calculating producing pressure differential, and the efficiency for calculating producing pressure differential can be improved.In addition, according to cumulative injection
After drawing out injection curve with the first injection pressure, the intercept of curve can be injected, by calculating to determine the second injection pressure
Power, it is possible thereby to make the calculation of the second injection pressure easier.
Fig. 4 is that the structure of the computing device embodiment one of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to, as shown in figure 4, the device includes: measurement module 11 and computing module 12.
Measurement module 11 is used to measure the well head pressure before injection fluid；
The measurement module 11 is also used to measure the accumulation note of the fluid when injecting fluid into carbonate rock oil well
Enter amount and the first injection pressure corresponding with the cumulative injection；First injection pressure is to inject the accumulation note
Injection pressure after entering the fluid of amount；
Computing module 12 is used to be calculated according to the well head pressure, the cumulative injection and first injection pressure
Producing pressure differential；Wherein, difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).
The computing device of the carbonate rock oil well producing pressure differential provided in the present embodiment, measurement module 11 pass through measurement injection
Well head pressure before fluid, when injecting fluid into carbonate rock oil well, measurement module 11 measures the accumulation note of the fluid
Enter amount and the first injection pressure corresponding with cumulative injection, which is to inject the fluid of cumulative injection
Injection pressure afterwards, computing module 12 calculate producing pressure differential according to well head pressure, cumulative injection and the first injection pressure；Its
In, difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).Due to only needing shaft mouth test pressure, injecting fluid
Cumulative injection and the first injection pressure, can quickly calculate producing pressure differential, avoid the survey that needs to go into the well in the prior art
Thus the phenomenon that measuring flowing bottomhole pressure (FBHP) can not only reduce the cost for calculating producing pressure differential, but also calculating producing pressure differential can be improved
Efficiency.
Fig. 5 is that the structure of the computing device embodiment two of carbonate rock oil well producing pressure differential provided in an embodiment of the present invention is shown
It is intended to, on the basis of the embodiment shown in fig. 4, which includes: judging submodule 121, determines submodule 122 and meter
Operator module 123.
Judging submodule 121 is for judging whether linearly close between the cumulative injection and first injection pressure
System；
When determining that submodule 122 is used in a linear relationship between the cumulative injection and first injection pressure,
According to the cumulative injection and first injection pressure, the second injection pressure when influent stream body is infused on stratum is determined；
Computational submodule 123 is used to calculate the producing pressure differential according to second injection pressure and the well head pressure.
The computing device of the carbonate rock oil well producing pressure differential provided in the present embodiment, can be used for executing it is aforementioned either one
The technical solution of method embodiment, implementing principle and technical effect are similar with embodiment of the method, and details are not described herein.
Optionally, the computational submodule 123 is specifically used for:
According to formula Δ P=(P1-P2)/2 calculate the producing pressure differential；
Wherein, Δ P is the producing pressure differential, P1For second injection pressure, P2For the well head pressure.
The computing device of the carbonate rock oil well producing pressure differential provided in the present embodiment, can be used for executing it is aforementioned either one
The technical solution of method embodiment, implementing principle and technical effect are similar with embodiment of the method, and details are not described herein.
Optionally, the judging submodule 121 is specifically used for:
Injection curve is drawn according to the cumulative injection and first injection pressure；
Judge whether linearly close between the cumulative injection and first injection pressure according to the injection curve
System.
The computing device of the carbonate rock oil well producing pressure differential provided in the present embodiment, can be used for executing it is aforementioned either one
The technical solution of method embodiment, implementing principle and technical effect are similar with embodiment of the method, and details are not described herein.
Optionally, the determining submodule 122 is specifically used for:
According to the cumulative injection and first injection pressure, the intercept of the injection curve is calculated；
The intercept is determined as second injection pressure.
The computing device of the carbonate rock oil well producing pressure differential provided in the present embodiment, can be used for executing it is aforementioned either one
The technical solution of method embodiment, implementing principle and technical effect are similar with embodiment of the method, and details are not described herein.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of calculation method of carbonate rock oil well producing pressure differential characterized by comprising
Well head pressure before measurement injection fluid；
When injecting fluid into carbonate rock oil well, measures the cumulative injection of the fluid and injected with the accumulation
Measure corresponding first injection pressure；First injection pressure is the injection pressure after the fluid for injecting the cumulative injection；
According to the well head pressure, the cumulative injection and first injection pressure, producing pressure differential is calculated；Wherein, described
Difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).
2. the method according to claim 1, wherein described according to the well head pressure, the cumulative injection
With first injection pressure, producing pressure differential is calculated, comprising:
Judge whether in a linear relationship between the cumulative injection and first injection pressure；
If in a linear relationship between the cumulative injection and first injection pressure, according to the cumulative injection and institute
The first injection pressure is stated, determines the second injection pressure when influent stream body is infused on stratum；
According to second injection pressure and the well head pressure, the producing pressure differential is calculated.
3. according to the method described in claim 2, it is characterized in that, described according to second injection pressure and the well head pressure
Power calculates the producing pressure differential, comprising:
According to formula Δ P=(P1-P2)/2 calculate the producing pressure differential；
Wherein, Δ P is the producing pressure differential, P1For second injection pressure, P2For the well head pressure.
4. according to the method in claim 2 or 3, which is characterized in that described to judge the cumulative injection and described first
It is whether in a linear relationship between injection pressure, comprising:
Injection curve is drawn according to the cumulative injection and first injection pressure；
Judged according to the injection curve whether in a linear relationship between the cumulative injection and first injection pressure.
5. according to the method described in claim 4, it is characterized in that, described inject according to the cumulative injection with described first
Pressure determines the second injection pressure when influent stream body is infused on stratum, comprising:
According to the cumulative injection and first injection pressure, the intercept of the injection curve is calculated；
The intercept is determined as second injection pressure.
6. a kind of computing device of carbonate rock oil well producing pressure differential characterized by comprising
Measurement module, for measuring the well head pressure before injecting fluid；
The measurement module, be also used into carbonate rock oil well inject fluid when, measure the fluid cumulative injection,
And the first injection pressure corresponding with the cumulative injection；First injection pressure is the injection cumulative injection
Injection pressure after fluid；
Computing module, for calculating production pressure according to the well head pressure, the cumulative injection and first injection pressure
Difference；Wherein, difference of the producing pressure differential between strata pressure and flowing bottomhole pressure (FBHP).
7. device according to claim 6, which is characterized in that the computing module, comprising:
Judging submodule, it is whether in a linear relationship between the cumulative injection and first injection pressure for judging；
Submodule is determined, when being used in a linear relationship between the cumulative injection and first injection pressure, according to institute
Cumulative injection and first injection pressure are stated, determines the second injection pressure when influent stream body is infused on stratum；
Computational submodule, for calculating the producing pressure differential according to second injection pressure and the well head pressure.
8. device according to claim 7, which is characterized in that the computational submodule is specifically used for:
According to formula Δ P=(P1-P2)/2 calculate the producing pressure differential；
Wherein, Δ P is the producing pressure differential, P1For second injection pressure, P2For the well head pressure.
9. device according to claim 7 or 8, which is characterized in that the judging submodule is specifically used for:
Injection curve is drawn according to the cumulative injection and first injection pressure；
Judged according to the injection curve whether in a linear relationship between the cumulative injection and first injection pressure.
10. device according to claim 9, which is characterized in that the determining submodule is specifically used for:
According to the cumulative injection and first injection pressure, the intercept of the injection curve is calculated；
The intercept is determined as second injection pressure.
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