CN105718699B - The calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change - Google Patents
The calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change Download PDFInfo
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Abstract
The present invention provides the calculation method of a kind of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change, including according to drilling well basic parameter, obtains annular space stable state landwaste bed height；Obtain Annular Cuttings bed dynamic migration velocity；According to Annular Cuttings bed dynamic migration velocity, Annular Cuttings bed dynamic migration distance is obtained；According to Annular Cuttings bed dynamic migration distance, the distribution of Annular Cuttings bed height is obtained；According to drilling well basic parameter and the landwaste bed height, the annular pressure lost of different moments is obtained；According to the vertical depth of the annular pressure lost of different moments and shaft bottom, the bottom pressure of different moments is obtained.The real-time distribution of Annular Cuttings bed height and bottom pressure changes when the present invention can fast and accurately calculate drilling, creeps into Hydraulics design for the oblique section of length and calculating provides help, helps to reduce down-hole accident, improves drilling efficiency.
Description
Technical field
The present invention relates to oil and gas to open technical field, more specifically, is related to a kind of extended reach well drilling High angle
The distribution of Annular Cuttings bed height and bottom pressure real-time change when well section and horizontal well well section (are referred to as) drilling well below with the oblique section of length
Simple calculating method.
Background technique
Extended reach well is substantially the longer directional well of horizontal displacement, currently, it is directly to make that its elevation computation scene is mostly
With directional well research achievement., in High angle well section and not too long net horizontal section, error can receive for this.But it is being applied to Gao Shui
It hangs down than extended reach well, when especially marine ultrahigh water is hung down than extended reach well, it will generate large error.Itself the reason is as follows that: a side
Face, marine many its High angle well sections of extended reach well and net horizontal section are up to 3000-5000 meters, in this well section drilling well, stratum
Fracture pressure is basically unchanged, and bottom pressure is then gradually increased with the increase of annular pressure lost, and the two difference is smaller and smaller, pole
Easily induce down-hole accident.This requires for bottom pressure (annular pressure lost) calculating and prediction must be accurate enough and accurate.
On the other hand, studies have shown that High angle well section and net horizontal section landwaste easily sink to forming cutting bed, cutting bed is to annular pressure lost
Influence is very big, and to accurately calculate annular pressure lost just must understand the distribution of Annular Cuttings bed first.With the increasing of extended reach well well depth
Add, High angle well section is increasingly longer, and cutting bed entire annular space from is being formed to being paved with takes a long time when drilling well, adds
The influence of constructing operation, in the process, the distribution of Annular Cuttings bed are real-time changes, and steady-state model is only capable of calculating annular space and reaches
Finally formed landwaste bed height after stabilization, and the changes in distribution of cutting bed in whole process can not be calculated.Cutting bed is distributed not
Know, annular pressure drop can not naturally also accurately calculate, and be unable to satisfy the needs of extended reach well wellbore cleaning and Hydraulics design.Mesh
Before, multiple cutting bed dynamic transport models have been established both at home and abroad, these models are complicated Nonlinear System of Equations, and it is difficult to solve
Degree is high, speed is slow, is not suitable for engineer application, is difficult to engineering design and provides direct help.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of distribution of drilling well Annular Cuttings bed height and bottom pressure are real
The calculation method of Shi Bianhua, to solve the problems, such as that the defect of existing complex nonlinear cutting bed dynamic mobile model, the method are fast
The real-time distribution variation of Annular Cuttings bed height and bottom pressure when speed, accurate calculating drilling well, for the oblique section drilling well waterpower ginseng of length
Number design and calculating provide help, reduce down-hole accident, improve drilling efficiency.
The present invention provides the pressure real-time change calculating side of a kind of extended reach well drilling Annular Cuttings bed height distribution and shaft bottom
Method, comprising:
According to the drilling well basic parameter of acquisition, annular space stable state landwaste bed height is obtained；
According to the annular space stable state landwaste bed height, obtains cutting bed passage speed and suspension landwaste settles into speed；
Speed is elapsed according to the cutting bed and suspension landwaste settles into speed, obtains Annular Cuttings bed dynamic migration speed
Degree；
According to the Annular Cuttings bed dynamic migration velocity, Annular Cuttings bed dynamic migration distance is obtained；
According to the annular space stable state landwaste bed height and the Annular Cuttings bed dynamic migration distance, Annular Cuttings bed is obtained
Height is distributed；
According to the drilling well basic parameter and the landwaste bed height, the annular pressure lost of different moments is obtained；
According to the vertical depth of the annular pressure lost of the different moments and shaft bottom, the bottom pressure of different moments is obtained.
Furthermore it is preferred that scheme be according to Drilling Design and measured data, to obtain drilling well basic parameter；Wherein, the brill
Well basic parameter includes section wellbore internal diameter, drill string outer diameter, mud displacement, mud density, mud rheological parameter, drill string revolving speed, bores
The column degree of eccentricity, rate of penetration, hole angle, cuttings density, landwaste partial size and shaft bottom vertical depth.
Furthermore it is preferred that scheme be in the drilling well basic parameter according to acquisition, to obtain the mistake of annular space stable state landwaste bed height
Cheng Zhong is obtained using following formula:
Wherein, HcFor landwaste bed height；
dw、dpoAnd dbRespectively wellbore internal diameter, drilling rod outer diameter and bit diameter；
ρfAnd ρsRespectively mud and cuttings density；
μeFor effective viscosity；UaSpeed is returned for annular space；ROP is rate of penetration；
RPM is rod rotation speed；θ is hole angle；dsFor landwaste diameter；E is the degree of eccentricity.
Furthermore it is preferred that scheme be according to the annular space stable state landwaste bed height, to obtain cutting bed passage speed and outstanding
During foam bits settle into speed, wherein the cutting bed elapses speed calculation formula are as follows:
The suspension landwaste settles into a speed calculation formula are as follows:
Wherein, UcmSpeed is elapsed for cutting bed；
UcdSpeed is settled into for suspension landwaste；
fhdFor superposed layer and mobile layer interfacial friction factor；
CdFor mobile concentration of cuttings；
φ is particle internal friction angle, and tan φ is equivalent to particle dynamic friction coefficient, works as CdWhen=0.3~0.52, tan φ=
0.7~0.8；
QsFor entrance landwaste volume flow；
QfFor entrance mud volume flow；
k1、k2For correction factor；k3For proportionality coefficient.
Furthermore it is preferred that scheme be to settle into speed elapsing speed and suspension landwaste according to the cutting bed, obtaining
During Annular Cuttings bed dynamic migration velocity, wherein the calculation formula of the Annular Cuttings bed dynamic migration velocity are as follows:
Wherein, UcFor Annular Cuttings bed dynamic migration velocity；
k3For proportionality coefficient；
UcmSpeed is elapsed for cutting bed；
UcdSpeed is settled into for suspension landwaste.
Furthermore it is preferred that scheme be according to the Annular Cuttings bed dynamic migration velocity, to obtain Annular Cuttings bed dynamic
During migration distance, wherein the formula for obtaining the Annular Cuttings bed dynamic migration distance is as follows:
Lc=tUc
Wherein, UcFor Annular Cuttings bed dynamic migration velocity；
T is that cutting bed initially forms the time experienced；
LcFor the distance that after the t time, stable state cutting bed is migrated.
Furthermore it is preferred that scheme be, according to the annular space stable state landwaste bed height and the Annular Cuttings bed dynamic transport
Distance is moved, during obtaining the distribution of Annular Cuttings bed height, wherein
If x >=MD-Lc, then Hcx=Hc
If x < MD-Lc, then HcxFormula is as follows:
Wherein, HcFor landwaste bed height；
MD is the total depth measurement of well；
X is the depth measurement of position to be asked, and is MD in shaft bottom, is 0 in well head；
HcxFor landwaste bed height at x position.
Furthermore it is preferred that scheme be, according to the drilling well basic parameter and the landwaste bed height, to obtain different moments
Annular pressure lost during, the formula for obtaining the annular pressure lost is as follows:
Wherein, Δ PcTo there is the annular pressure lost in the presence of cutting bed；
ΔPaFor the annular pressure lost in the presence of no cutting bed；
fbFor darcy-Wei Si Bach's coefficient, when laminar flowWhen turbulent
HcFor landwaste bed height；
dw、dpoRespectively wellbore internal diameter, drilling rod outer diameter；
ρfAnd ρsRespectively mud and cuttings density；
QfFor entrance mud volume flow.
Furthermore it is preferred that scheme be, according to the annular pressure lost of the different moments and the vertical depth in shaft bottom, to obtain not
During bottom pressure in the same time, the formula for obtaining the bottom pressure is as follows:
Pw=ρfgh+ΔPc
Wherein, PwFor bottom pressure；
ρfFor mud density；
H is the vertical depth in shaft bottom；
ΔPcTo there is the annular pressure lost in the presence of cutting bed.
It can be seen from the above technical scheme that drilling well Annular Cuttings bed height distribution provided by the invention and bottom pressure are real-time
The calculation method of variation, can obtain it is following the utility model has the advantages that
(1) this method considers the forming process of cutting bed, can calculate the distribution of different moments Annular Cuttings bed height in real time,
And corresponding bottom pressure, steady-state model more closing to reality situation is compared, it is smaller to calculate error.
(2) by calculating landwaste dynamic migration velocity, and Annular Cuttings bed height is described using geometrical curve and is distributed, it will be steady
State cutting bed height computation model combines with the variation of landwaste bed height distribution dynamic, extends existing stable state landwaste operation mould
The application range of type.
(3) method of the invention calculates letter compared to existing landwaste dynamic transport model (complex nonlinear equation group)
Just, speed is fast, is very suitable to engineer application, filled up complicated landwaste dynamic transport model not can be used directly it is actual in engineering
Defect provides a kind of effective means for engineering design.
To the accomplishment of the foregoing and related purposes, one or more aspects of the present invention include be particularly described below and
The feature particularly pointed out in claim.Certain illustrative aspects of the invention is described in detail in the following description and the annexed drawings.
However, these aspects indicate only usable some of the various ways in the principles of the present invention.In addition, of the invention
It is intended to include all such aspects and their equivalent.
Detailed description of the invention
By reference to the following description in conjunction with the accompanying drawings and the contents of the claims, and with to it is of the invention more comprehensively
Understand, other objects and results of the present invention will be more clearly understood and understood.In the accompanying drawings:
Fig. 1 is the calculating according to the drilling well Annular Cuttings bed height of embodiment of the present invention distribution and bottom pressure real-time change
Method flow schematic diagram.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific embodiment
In the following description, for purposes of illustration, it in order to provide the comprehensive understanding to one or more embodiments, explains
Many details are stated.It may be evident, however, that these embodiments can also be realized without these specific details.
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In order to illustrate the calculating side of drilling well Annular Cuttings bed height provided by the invention distribution and bottom pressure real-time change
Method, Fig. 1 show the calculating of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change according to an embodiment of the present invention
Method flow.
As shown in Figure 1, the calculating of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change provided by the invention
Method includes:
S110: according to the drilling well basic parameter of acquisition, annular space stable state landwaste bed height is obtained；
S120: it according to annular space stable state landwaste bed height, obtains cutting bed passage speed and suspension landwaste settles into speed；
S130: elapsing speed according to cutting bed and suspension landwaste settle into speed, obtains Annular Cuttings bed dynamic and migrates
Speed；
S140: according to Annular Cuttings bed dynamic migration velocity, Annular Cuttings bed dynamic migration distance is obtained；
S150: according to annular space stable state landwaste bed height and Annular Cuttings bed dynamic migration distance, the Annular Cuttings height of bed is obtained
Degree distribution；
S160: according to drilling well basic parameter and the landwaste bed height, the annular pressure lost of different moments is obtained；
S170: according to the vertical depth of the annular pressure lost of different moments and shaft bottom, the bottom pressure of different moments is obtained.
The above-mentioned detailed process for the distribution of drilling well Annular Cuttings bed height and the calculation method of bottom pressure real-time change,
It before obtaining annular space stable state landwaste bed height, first has to obtain drilling well basic parameter, according to Drilling Design and measured data, obtain
Drilling well basic parameter, drilling well basic parameter include calculating section wellbore internal diameter, drill string outer diameter, mud displacement, mud density, mud stream
Variable element, drill string revolving speed, the drill string degree of eccentricity, rate of penetration, hole angle, cuttings density, landwaste partial size, shaft bottom vertical depth.
In above-mentioned steps S110, annular space stable state landwaste bed height (1) can calculate according to the following formula, can also be according to it
Its stable state cutting bed height model calculates.
Wherein, HcFor landwaste bed height, unit mm；dw、dpoAnd dbRespectively wellbore internal diameter, drilling rod outer diameter and drill bit are straight
Diameter, unit mm；ρfAnd ρsRespectively mud and cuttings density, unit g/cm3；μeFor effective viscosity, unit cP；UaFor ring
Sky returns speed, unit m/s；ROP is rate of penetration, unit m/h；RPM is rod rotation speed, and unit is rev/min；θ is hole angle, single
Position is °；dsFor landwaste diameter, unit mm；E is the degree of eccentricity, zero dimension.
For power-law fluid, effective viscosity μeIt can be calculated according to formula (2):
Wherein, n is power-law fluid liquidity index, zero dimension；K is power-law fluid consistency coefficient, Pa ﹒ sn。
In above-mentioned steps S120 and S130, the specific steps of Annular Cuttings bed dynamic migration velocity are calculated are as follows: calculate outstanding
Floating layer and landwaste bed boundary coefficient of friction；It calculates cutting bed and elapses speed；It calculates suspension landwaste and settles into speed；Cutting bed
Passage speed and suspension landwaste settle into speed and are added as cutting bed dynamic migration velocity in proportion；It is specific as follows:
Annular Cuttings bed dynamic migration velocity, which calculates, (3) to be calculated according to the following formula:
Wherein, cutting bed elapses speed UcmCalculation formula are as follows:
Suspension landwaste settles into a speed UcdCalculation formula are as follows:
Wherein, fhdFor superposed layer and mobile layer interfacial friction factor, the following formula of calculation method (7) be can also be used other
Coefficient of friction between interface；CdFor mobile concentration of cuttings；φ is particle internal friction angle, and tan φ is equivalent to particle dynamic friction coefficient, with
Granule density is related, and concentration is bigger, is worth bigger, CdWhen=0.3~0.52, φ=0.7~0.8 tan；QsFor entrance landwaste volume
Flow, m3/s；QfFor entrance mud volume flow, m3/s；k1、k2For correction factor, with annular space geometric shape, simplified formula error
Etc. related, it can be acquired according to experiment or measured data, can use 1；k3For proportionality coefficient, it is related that rock intensity is taken with mud suspension, it can
It is acquired according to experiment or measured data, can use 0.5.
Wherein, dsFor landwaste diameter；dwFor wellbore internal diameter.
In step S140, according to cutting bed migration time and speed, cutting bed dynamic migration distance is calculated.Wherein, ring
Empty cutting bed dynamic migration distance (8) can calculate according to the following formula:
Lc=tUc (8)
Wherein, t be cutting bed initially form or erosion to calculating the time experienced at moment, unit s；LcFor by t
After time, the distance of stable state cutting bed migration, unit m.
In step S150, the specific steps of different moments Annular Cuttings bed height distribution are calculated are as follows: it is upward from shaft bottom, it will
Annular space is divided into two sections, and one section of cutting bed section for stable state height, a Duan Weicong stable state height is gradually decremented to zero cutting bed section,
The former Annular Cuttings bed height is equal to stable state landwaste bed height, and the distribution of the latter's landwaste bed height can be described with a geometrical curve,
And it is calculated with corresponding formula.
Specifically, the distribution of different moments Annular Cuttings bed height (9) can calculate according to the following formula:
If x >=MD-Lc, then Hcx=Hc；
If x < MD-Lc, then HcxIt is calculated by formula (9).
Wherein, MD is the total depth measurement of well, unit m；X is the depth measurement of position to be asked, and is MD in shaft bottom, is 0 in well head, unit
For m；HcxFor landwaste bed height at x position, unit m.
In step S160 and S170, the specific steps of different moments annular pressure lost and bottom pressure are calculated are as follows: to pit shaft
Annular space is segmented, and is calculated a certain moment Annular Cuttings bed height using above method and is distributed, i.e. each section of Annular Cuttings height of bed
Degree, calculates each section with/without cutting bed annular pressure lost further according to formula, all sections are added as current time total annular pressure lost；
According to mud density and vertical depth, static bottom hole pressure is calculated；The two, which is added, calculates bottom pressure.
Specifically, (segment length can use 25m or 30m) is segmented to mineshaft annulus, calculates certain for the moment using above formula (9)
The distribution of Annular Cuttings bed height is carved, i.e. each section of Annular Cuttings bed height calculates each section of annular space further according to following formula (10)
Pressure consumption, all sections are added as current time total annular pressure lost:
Wherein, Δ PcTo have the annular pressure lost in the presence of cutting bed, Pa；ΔPaFor the annular pressure lost in the presence of no cutting bed,
Pa；fbFor darcy-Wei Si Bach's coefficient, when laminar flowWhen turbulent
Without the annular pressure lost Δ P in the presence of cutting bedaIt (11) can calculate according to the following formula:
Wherein, l is well section length, m；F is mould group coefficient, for power-law fluid, can according to the following formula (12) or
(13) it calculates:
The laminar flow coefficient of friction resistance: annular space: f=24/Re (12)
The turbulent coefficient of friction resistance:
Wherein, Re is that annular fluid flows Reynolds number, for power-law fluid, (14) can be calculated according to the following formula:
Different moments bottom pressure (15) can calculate according to the following formula:
Pw=ρfgh+ΔPc (15)
Wherein, PwFor bottom pressure；ρfFor mud density；H is the vertical depth in shaft bottom；ΔPcIn the presence of having a cutting bed
Annular pressure lost.
By above embodiment as can be seen that drilling well Annular Cuttings bed height provided by the invention distribution and bottom pressure
The calculation method of real-time change, is able to solve the defect of existing complex nonlinear cutting bed dynamic transport model, and this method is based on
Analysis and simplification to the landwaste dynamic transport model that Cutting movement mechanism is established with early stage, by calculating landwaste dynamic migration speed
Degree, and describe Annular Cuttings bed height using geometrical curve and be distributed, by stable state cutting bed height computation model and landwaste bed height
Distribution dynamic variation combines, and can quick and precisely calculate Annular Cuttings bed height and the variation of bottom pressure real-time distribution.
Describe the drilling well Annular Cuttings bed height distribution proposed according to the present invention in an illustrative manner above with reference to attached drawing
With the calculation method of bottom pressure real-time change.It will be understood by those skilled in the art, however, that being proposed for aforementioned present invention
Drilling well Annular Cuttings bed height distribution and bottom pressure real-time change calculation method, the content of present invention can also not departed from
On the basis of make various improvement.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (8)
1. a kind of calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change, comprising:
According to the drilling well basic parameter of acquisition, annular space stable state landwaste bed height is obtained；
In the drilling well basic parameter according to acquisition, during obtaining annular space stable state landwaste bed height, obtained using following formula:
Wherein, HcFor landwaste bed height；
dw、dpoAnd dbRespectively wellbore internal diameter, drilling rod outer diameter and bit diameter；
ρfAnd ρsRespectively mud density and cuttings density；
μeFor effective viscosity；UaSpeed is returned for annular space；ROP is rate of penetration；
RPM is rod rotation speed；θ is hole angle；dsFor landwaste diameter；E is the degree of eccentricity；
According to the annular space stable state landwaste bed height, obtains cutting bed passage speed and suspension landwaste settles into speed；
Speed is elapsed according to the cutting bed and suspension landwaste settles into speed, obtains Annular Cuttings bed dynamic migration velocity；
According to the Annular Cuttings bed dynamic migration velocity, Annular Cuttings bed dynamic migration distance is obtained；
According to the annular space stable state landwaste bed height and the Annular Cuttings bed dynamic migration distance, Annular Cuttings bed height is obtained
Distribution；
It is distributed according to the drilling well basic parameter and the Annular Cuttings bed height, obtains the annular pressure lost of different moments；
According to the vertical depth of the annular pressure lost of the different moments and shaft bottom, the bottom pressure of different moments is obtained.
2. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as described in claim 1,
In,
According to Drilling Design and measured data, drilling well basic parameter is obtained；Wherein,
The drilling well basic parameter includes section wellbore internal diameter, drill string outer diameter, mud displacement, mud density, mud rheological parameter, bores
Column revolving speed, the drill string degree of eccentricity, rate of penetration, hole angle, cuttings density, landwaste partial size and shaft bottom vertical depth.
3. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as described in claim 1,
In,
According to the annular space stable state landwaste bed height, obtains cutting bed passage speed and suspension landwaste settles into the mistake of speed
Cheng Zhong, wherein the cutting bed elapses speed calculation formula are as follows:
The suspension landwaste settles into a speed calculation formula are as follows:
Wherein, UcmSpeed is elapsed for cutting bed；
UcdSpeed is settled into for suspension landwaste；
fhdFor superposed layer and mobile layer interfacial friction factor；
CdFor mobile concentration of cuttings；
φ is particle internal friction angle, and tan φ is equivalent to particle dynamic friction coefficient, works as CdWhen=0.3~0.52, φ=0.7 tan~
0.8；
QsFor entrance landwaste volume flow；
QfFor entrance mud volume flow；
k1、k2For correction factor；k3For proportionality coefficient.
4. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as claimed in claim 3,
In,
Speed is being settled into according to cutting bed passage speed and suspension landwaste, is obtaining Annular Cuttings bed dynamic migration velocity
During, wherein the calculation formula of the Annular Cuttings bed dynamic migration velocity are as follows:
Wherein, UcFor Annular Cuttings bed dynamic migration velocity；
k3For proportionality coefficient；
UcmSpeed is elapsed for cutting bed；
UcdSpeed is settled into for suspension landwaste.
5. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as claimed in claim 4,
In,
According to the Annular Cuttings bed dynamic migration velocity, during obtaining Annular Cuttings bed dynamic migration distance, wherein
The formula for obtaining the Annular Cuttings bed dynamic migration distance is as follows:
Lc=tUc
Wherein, UcFor Annular Cuttings bed dynamic migration velocity；
T is that cutting bed initially forms the time experienced；
LcFor the distance that after the t time, stable state cutting bed is migrated.
6. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as claimed in claim 5,
In,
According to the annular space stable state landwaste bed height and the Annular Cuttings bed dynamic migration distance, the Annular Cuttings height of bed is obtained
During degree distribution, wherein
If x >=MD-Lc, then Hcx=Hc
If x < MD-Lc, then HcxFormula is as follows:
Wherein, HcFor landwaste bed height；
MD is the total depth measurement of well；
X is the depth measurement of position to be asked, and is MD in shaft bottom, is 0 in well head；
HcxFor landwaste bed height at x position.
7. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as described in claim 1,
In,
According to the drilling well basic parameter and Annular Cuttings bed height distribution, the mistake of the annular pressure lost of different moments is obtained
Cheng Zhong, the formula for obtaining the annular pressure lost are as follows:
Wherein, Δ PcTo there is the annular pressure lost in the presence of cutting bed；
ΔPaFor the annular pressure lost in the presence of no cutting bed；
fbFor darcy-Wei Si Bach's coefficient, when laminar flowWhen turbulent
HcFor landwaste bed height；
dw、dpoRespectively wellbore internal diameter, drilling rod outer diameter；
ρfAnd ρsRespectively mud density and cuttings density；
QfFor entrance mud volume flow.
8. the calculation method of drilling well Annular Cuttings bed height distribution and bottom pressure real-time change as claimed in claim 7,
In,
According to the annular pressure lost of the different moments and the vertical depth in shaft bottom, the process of the bottom pressure of different moments is obtained
In, the formula for obtaining the bottom pressure is as follows:
Pw=ρfgh+ΔPc
Wherein, PwFor bottom pressure；
ρfFor mud density；
H is the vertical depth in shaft bottom；
ΔPcTo there is the annular pressure lost in the presence of cutting bed.
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| CN109598024A (en) * | 2018-11-02 | 2019-04-09 | 长江大学 | The drilling well waterpower optimization method and equipment coupled based on wellbore cleaning with annular pressure |
| CN109854237B (en) * | 2019-03-04 | 2019-10-22 | 西南石油大学 | A kind of method and system of bottom pressure prediction |
| CN111236869B (en) * | 2020-01-10 | 2021-08-10 | 中国石油大学(北京) | Method, device and equipment for determining rock debris distribution under pump stop working condition |
| CN112145167B (en) * | 2020-11-10 | 2022-02-22 | 西南石油大学 | Fracturing dynamic bottom hole pressure calculation method based on construction data |
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