CN1670332A - Method for determining mud penetrating depth of water-exclusion marine drilling pipe - Google Patents
Method for determining mud penetrating depth of water-exclusion marine drilling pipe Download PDFInfo
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- CN1670332A CN1670332A CN 200410008657 CN200410008657A CN1670332A CN 1670332 A CN1670332 A CN 1670332A CN 200410008657 CN200410008657 CN 200410008657 CN 200410008657 A CN200410008657 A CN 200410008657A CN 1670332 A CN1670332 A CN 1670332A
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Abstract
This invention discloses a method of confirming well water exclusion vessel entering mud depth on sea. Procedures are that minimum entering mud depth hmin is calculated as situation of water exclusion is only act as mud cycle channel. Minimum depth Hmin of water exclusion vessel do not loss stability is confirmed when the vessel is used as well head holding structure. Then hmin and Hmin are compared and the maximum value is used as the minimum entering depth. This invention can confirm reasonable depth of the vessel according to different sea bottom geological environment of different sea area, and meet the request of different oil field drilling technology. Sea accident brought by water exclusion entering depth is reduced and economic waste is avoided, the goal of safe and economic is reached.
Description
Technical field
The present invention relates to a kind of offshore oil exploration technology, especially a kind ofly be used to solve the offshore drilling riser pipe and go into the method that the mud degree of depth is rationally determined.
Background technology
At sea in the exploration of oil, the mud degree of depth of going into of drilling riser plays an important role for exploration, the exploitation of whole oil, if it is too small to go into the mud degree of depth, will cause the unstability of well head, marine complex accident such as sink; If it is excessive to go into the mud degree of depth, will cause waste economically.And at present, the mud degree of depth of going into of drilling riser generally is empirical value: about 50 meters, in different marine sites, the difference of sea conditions requires also inequalityly for the mud degree of depth of going into of drilling riser, and still selects identical 50 meters of the mud degree of depth of going into this moment, then exist irrationality, it is shallow excessively to go into the mud degree of depth, will cause the unstability of well head, marine accident such as sink, and causes casualties and economic loss; It is dark excessively to go into the mud degree of depth, causes the too much waste of equipment, just Jing Ji too much waste.So, how to determine that the mud degree of depth of going into of reasonable drilling riser becomes a problem that urgency is to be solved in the oil exploration technology.
Summary of the invention
The technical problem to be solved in the present invention provides definite method that a kind of offshore drilling riser pipe is gone into the mud degree of depth, reasonably determine drilling well and go into the mud degree of depth every conduit, avoid economic waste, reduce marine owing to drilling well is gone into the mud degree of depth every conduit and crossed the shallow marine accident that causes.
The present invention is achieved through the following technical solutions:
A kind of offshore drilling riser pipe is gone into definite method of the mud degree of depth, comprises the steps:
Step 100:, carry out riser pipe and go into the mud depth calculation only as the passage situation of mud circulation according to riser pipe, promptly riser pipe is gone into the mud degree of depth and must be satisfied the formation fracture pressure P of the fluid column pressure P at guide shoe place less than the guide shoe place
f
Minimum when riser pipe is only set up as the passage of mud circulation is gone into mud degree of depth h
MinShould satisfy following formula:
Wherein,
N: safety factor generally is taken as 1.5;
P
f: the fracture pressure on stratum, guide shoe place, MPa; See below calculating
P
Consumption: the pressure loss in annular of run laminar flow, MPa; See below calculating
ρ
Mud: the fluid density of use, g/cm
3Value is from the mud density value in the table 2
L: well head is to the length of seabed mud face riser pipe, m.Value adds from the water depth value in the table 1
Preventer height value in the table 3
Step 200: when riser pipe is held the power structure as well head, determine that the minimum when riser pipe unstability does not take place is gone into the mud depth H
Min
By the riser pipe force analysis as can be known, the stress balance equation is in vertical direction:
N
On+ W
Deadweight=N
Down+ N
f
In the formula, N
OnFor well head imposes on the axial load (comprising preventer weight) of riser pipe, t; W
DeadweightBe the weight of riser pipe, t; N
DownBe the bearing capacity that the riser pipe bottom is subjected to, t; N
fBe the frictional force that the riser pipe side direction is subjected to, t;
Has only the N of working as
On+ W
Deadweight≤ N
Down+ N
fThe time, it is stable that riser pipe could keep, and do not sink and unstability does not take place.Therefore, this minimum is gone into the mud depth H
MinShould satisfy following formula:
Wherein, m is the external diameter of riser pipe, m; Value is the wall thickness of riser pipe from the conduit external diameter value δ in the table 3, m; Value is from the conduit wall thickness value γ in the table 3
SteelBe the density of conduit steel, t/m
3Value is 7.8
f
FloatingBe the buoyancy coefficient of riser pipe in drilling fluid; Value is 0.8
F is sidewall unit's frictional force of riser pipe, t/m
2F=α S
u, α is an adhesion factor, can table look-up according to the character of different soil to obtain; S
uBe undrained shear strength, value is from the undrained shear strength value in the table 1.
L is the length of well head to seabed mud face riser pipe, m; Value adds preventer height value in the table 3 from the water depth value in the table 1
N
Hold in the earth polarBe the ultimate bearing capacity of seafloor soil, t.Value is the face design formulas as follows
N
OnFor well head imposes on the axial load of riser pipe, comprise preventer weight, t.Value is from the upper load value in the table 3
Step 300: compare h
MinAnd H
MinSize, get its maximum value and go into the mud degree of depth as the minimum of final riser pipe.
Because h
MinAnd H
MinBetween maximum value, both satisfied the normal circulation that guarantees drilling fluid, guaranteed the stable of riser pipe again and unstability do not taken place that this is the requirement on the field engineering.The mud degree of depth of going into for the riser pipe minimum is a minimum definite value for drilling engineering safety, this just requires the depth of setting of on-the-spot riser pipe to be worth greater than this, otherwise complex accident such as casing shoe place drilling fluid leaks or the riser pipe unstability is sunk can take place in the wellbore construction process, if but the riser pipe depth of setting is excessive, will certainly cause the riser pipe consumption to increase, engineering cost increases, and brings waste economically.
Wherein, the fracture pressure P on the stratum, guide shoe place in the described step 100
fShould satisfy following formula:
P
f＝τ
max＝c+ptg，
Wherein, p is the normal stress that is applied on the soil body in the formula, MPa; Its design formulas
τ
MaxBe the development of maximum shear strength of seafloor soil, MPa;
C is the internal cohesion of seafloor soil, and MPa is by measuring soil sample; Value is from the internal cohesion value in the table 1
is the angle of internal friction of seafloor soil, and unit is for degree, by soil sample is measured.Value is from the angle of internal friction value in the table 1
In addition, the pressure loss in annular P of the run laminar flow in the described step 100
ConsumptionShould satisfy following formula:
Wherein, L
1For calculating catheter length, m; Value adds that from the depth of water in the table 1 soil is dark, adds the preventer height value in the table 3
Q is a fluid displacement, l/s; Value is from the displacement value in the table 2
D is the internal diameter of riser pipe, cm; Value is from the catheter diameter value in the table 2
D
pBe the external diameter of drill string, cm; Value is from the drill string external diameter value in the table 2
μ is the viscosity of fluid, pa.s.Value is from the viscosity number in the table 2
The present invention can be according to the actual conditions of different waters seabottom geology and sea situation, that determines the offshore drilling riser pipe rationally goes into the mud degree of depth, satisfy the requirement of different oil drilling technology, both reduced because of riser pipe and gone into the marine accident that the mud degree of depth causes, avoid economic waste again, reached not only safety but also economic purpose.
Description of drawings
Fig. 1 is a flow chart of the present invention.
The specific embodiment
Below the present invention will be described in detail by the drawings and specific embodiments.
Fig. 1 is a flow chart of the present invention,
Step 1: carry out oceanic geotechnical investigation, obtain following parameter: the internal cohesion c of seafloor soil, unit are MPa; The angle of internal friction of seafloor soil, unit is degree; By measuring, it is dark to obtain the dark value H soil of soil, according to design formulas
Obtain being applied to the normal stress p on the soil body, unit is MPa.
Step 2: according to the above parameter that measures, and according to formula P
f=τ
Max=c+ptg calculates the fracture pressure Pf on stratum, guide shoe place:
Step 3: the parameter that records riser pipe: the external diameter m of riser pipe, unit are m; The wall thickness δ of riser pipe, unit are m; The density γ of conduit steel
Steel, unit is t/m
3The buoyancy coefficient f of riser pipe in drilling fluid
FloatingThe frictional force f of sidewall unit of riser pipe, unit is t/m
2
Step 4: according to the above parameter that records, and according to formula N
Hold in the earth polar=N
cS
uA
In the formula, N
Hold in the earth polarThe ultimate bearing capacity of-viscous soil horizon, t; N
c-bearing capacity factor obtains from coefficient table; S
uThe average undrained shear strength of-conduit bottom soil, t/m
2, value is from the undrained shear strength in the table 1; The area of A-conduit section, m
2, calculate by the conduit external diameter in the table 3.
Calculate riser pipe bottom limit carrying N
Hold in the earth polar
Step 5: measure the well head parameter: well head is to the length L of seabed mud face riser pipe, and unit is m;
Step 6: measuring the preventer parameter, mainly is other load of preventer weight and well head N
On, t;
Step 7: according to formula
Minimum when calculating riser pipe and only setting up passage as mud circulation is gone into mud degree of depth h
Min
Step 8: according to formula
When the calculating riser pipe is held the power structure as well head, determine that the minimum when riser pipe unstability does not take place is gone into the mud depth H
Min
Step 9:, get its maximum value and go into mud concentration as riser pipe minimum under the integrated condition according to the result of calculation of step 7 and step 8.
Below the present invention will be further described as specific embodiment with the application of Bohai Sea NB35-2CEP platform.
At first taken a sample in NB35-2CEP land regions scene, obtain the soil property character shown in the table 1 after soil sample is measured chemical examination obtaining;
Then, obtain NB35-2CEP platform well drilling engineering parameter, wherein, NB35-2CEP platform well drilling construction parameter is as shown in table 2; NB35-2CEP platform well drilling load basic parameter is as shown in table 3;
The soil property character that riser pipe is lowered to mud degree of depth correspondence is: clay.
Minimum when riser pipe is only set up as the passage of mud circulation is gone into mud degree of depth h
MinBe the mechanics parameter that at first passes through table 1 seafloor soil, calculate the fracture pressure value of seafloor soil, utilize formula then
Calculate.This value that this area calculates is 32.4 meters.
When riser pipe is held the power structure as well head, determine that the minimum when riser pipe unstability does not take place is gone into the mud depth H
Min, at first, calculate N according to the parameter value in the table 1
Hold in the earth polar, and well head load is 85.0 tons, and (wherein wellhead blowout preventor weight is made as 30.0 tons, 0.5 ton of casing head, 13 3/8 " 54.5 tons of casing wts (600 meters of length).
Parameter value calculation according to table 2 and table 3 goes out f
Floating, substitution formula then
Calculate H
Min=42.32 meters;
Get the maximum value of above two values, as the 24 inches riser pipe minimums in this area go into the mud depth value, this value is 42.32 meters.
Table 1
Table 2
| Well-name | Lithology | Mud density (g/cm 3) | Catheter diameter (inch) | Drill string external diameter (inch) | Row's number (l/s) | Viscosity (pa.s) | Soil dark (m) |
| ?NB35-2CEP | Clay | ????1.05 | ????18 | ????9 | ????66 | ????30 | ????4 |
| ?NB35-2CEP | Sand | ????1.05 | ????18 | ????9 | ????66 | ????30 | ????6.3 |
| ?NB35-2CEP | Sand | ????1.05 | ????18 | ????9 | ????66 | ????30 | ????11.8 |
| ?NB35-2CEP | Sand | ????1.05 | ????18 | ????9 | ????66 | ????30 | ????16 |
| ?NB35-2CEP | Sand | ????1.05 | ????18 | ????9 | ????66 | ????30 | ????18.8 |
Table 3
| Well-name | Lotus (t) is worn on top | Conduit external diameter (inch) | Conduit wall thickness (inch) | Preventer height (m) | Lithology | Soil dark (m) |
| NB35-2CEP | ????85 | ????20 | ????1 | ????13 | Clay | ????4 |
| NB35-2CEP | ????85 | ????20 | ????1 | ????13 | Sand | ????6.3 |
| NB35-2CEP | ????85 | ????20 | ????1 | ????13 | Sand | ????11.8 |
| NB35-2CEP | ????85 | ????20 | ????1 | ????13 | Sand | ????16 |
| NB35-2CEP | ????85 | ????20 | ????1 | ????13 | Sand | ????18.8 |
It should be noted that at last: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1, a kind of definite offshore drilling riser pipe is gone into the method for the mud degree of depth, it is characterized in that: comprise the steps:
Step 100:, carry out riser pipe and go into the mud depth calculation only as the passage situation of mud circulation according to riser pipe, the minimum when riser pipe is only set up as the passage of mud circulation is gone into mud degree of depth h
MinShould satisfy following formula:
Wherein,
N: safety factor generally is taken as 1.5;
P
f: the fracture pressure on stratum, guide shoe place, MPa;
P
Consumption: the pressure loss in annular of run laminar flow, MPa;
ρ
Mud: the fluid density of use, g/cm
3
L: well head is to the length of seabed mud face riser pipe, m.
Step 200: when riser pipe is held the power structure as well head, determine that the minimum when riser pipe unstability does not take place is gone into the mud depth H
Min, this minimum is gone into the mud depth H
MinShould satisfy following formula:
Wherein, m is the outer warp of riser pipe, m;
δ is the wall thickness of riser pipe, m;
γ
SteelBe the density of conduit steel, t/m
3
f
FloatingBe the buoyancy coefficient of riser pipe in drilling fluid;
F is sidewall unit's frictional force of riser pipe, t/m
2
L is the length of well head to seabed mud face riser pipe, m;
N
Hold in the earth polarBe the ultimate bearing capacity of seafloor soil, t.
N
OnFor well head imposes on the axial load of riser pipe, comprise preventer weight, t.
Step 300: compare h
MinAnd H
MinSize, get its maximum value and go into the mud degree of depth as the minimum of final riser pipe.
2, definite offshore drilling riser pipe according to claim 1 is gone into the method for the mud degree of depth, it is characterized in that: the fracture pressure P on the stratum, guide shoe place in the described step 100
fShould satisfy following formula:
P
f＝τ
max＝c+ptg，
Wherein, p is the normal stress that is applied on the soil body in the formula, MPa; Its design formulas
τ
MaxBe the development of maximum shear strength of seafloor soil, MPa;
C is the internal cohesion of seafloor soil, MPa;
is the angle of internal friction of seafloor soil, and unit is degree.
3, definite offshore drilling riser pipe according to claim 1 is gone into the method for the mud degree of depth, it is characterized in that: the pressure loss in annular P of the run laminar flow in the described step 100
ConsumptionShould satisfy following formula:
Wherein, L
1For calculating catheter length, m;
Q is a fluid displacement, l/s;
D is the internal diameter of riser pipe conduit, cm;
D
pBe the external diameter of drill string, cm;
μ is the viscosity of Newtonian fluid, pa.s.
4, definite offshore drilling riser pipe according to claim 1 is gone into the method for the mud degree of depth, it is characterized in that: also comprised before step 100: investigation seabed soil property and soil analysis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008657 CN1670332A (en) | 2004-03-16 | 2004-03-16 | Method for determining mud penetrating depth of water-exclusion marine drilling pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008657 CN1670332A (en) | 2004-03-16 | 2004-03-16 | Method for determining mud penetrating depth of water-exclusion marine drilling pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581197B (en) * | 2009-06-24 | 2012-05-09 | 中国海洋石油总公司 | Design method for optimization of matching between pile hammer and riser pipe |
| CN102518099A (en) * | 2011-12-09 | 2012-06-27 | 中国石油大学(北京) | Method for determining insertion depth of offshore self-elevating drilling platform piles into mud |
| CN101581216B (en) * | 2009-06-19 | 2013-02-20 | 中国海洋石油总公司 | Driving depth calculation and control methods of large-size pipe shared by three bunchy wells |
| CN107191139A (en) * | 2017-07-10 | 2017-09-22 | 中国石油天然气股份有限公司 | Determine the determination method and device of insulation eccentric wear-resistant oil pipe depth of setting |
| CN108678672A (en) * | 2018-05-04 | 2018-10-19 | 中国石油集团海洋工程有限公司 | Deep water superficial part complex lithology formation conduit is efficiently placed in and well head stability forecast method |
| CN108733905A (en) * | 2018-05-10 | 2018-11-02 | 中国海洋石油集团有限公司 | A kind of ocean shallow water exploratory well riser pipe quickly selects the method for building up of plate |
-
2004
- 2004-03-16 CN CN 200410008657 patent/CN1670332A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581216B (en) * | 2009-06-19 | 2013-02-20 | 中国海洋石油总公司 | Driving depth calculation and control methods of large-size pipe shared by three bunchy wells |
| CN101581197B (en) * | 2009-06-24 | 2012-05-09 | 中国海洋石油总公司 | Design method for optimization of matching between pile hammer and riser pipe |
| CN102518099A (en) * | 2011-12-09 | 2012-06-27 | 中国石油大学(北京) | Method for determining insertion depth of offshore self-elevating drilling platform piles into mud |
| CN102518099B (en) * | 2011-12-09 | 2014-09-03 | 中国石油大学(北京) | Method for determining insertion depth of offshore self-elevating drilling platform piles into mud |
| CN107191139A (en) * | 2017-07-10 | 2017-09-22 | 中国石油天然气股份有限公司 | Determine the determination method and device of insulation eccentric wear-resistant oil pipe depth of setting |
| CN107191139B (en) * | 2017-07-10 | 2018-12-25 | 中国石油天然气股份有限公司 | Determine the determination method and device of insulation eccentric wear-resistant oil pipe depth of setting |
| CN108678672A (en) * | 2018-05-04 | 2018-10-19 | 中国石油集团海洋工程有限公司 | Deep water superficial part complex lithology formation conduit is efficiently placed in and well head stability forecast method |
| CN108733905A (en) * | 2018-05-10 | 2018-11-02 | 中国海洋石油集团有限公司 | A kind of ocean shallow water exploratory well riser pipe quickly selects the method for building up of plate |
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