CN108425650B - The online regulation device of drilling fluid density - Google Patents
The online regulation device of drilling fluid density Download PDFInfo
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- CN108425650B CN108425650B CN201810263801.5A CN201810263801A CN108425650B CN 108425650 B CN108425650 B CN 108425650B CN 201810263801 A CN201810263801 A CN 201810263801A CN 108425650 B CN108425650 B CN 108425650B
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- 238000005553 drilling Methods 0.000 title claims abstract description 181
- 239000012530 fluid Substances 0.000 title claims abstract description 117
- 230000033228 biological regulation Effects 0.000 title claims abstract description 61
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003208 petroleum Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 208000010392 Bone Fractures Diseases 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- 241000243321 Cnidaria Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003102 growth factor Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000013535 sea water Substances 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention is a kind of online regulation device of drilling fluid density, it is less than the hollow ball of drilling fluid density including outer cylinder and multiple density, centre bore is set in outer cylinder, centre bore includes the chamber that backflows, backflow chamber bottom connection setting drilling fluid via hole, laminate filtration construct is arranged in centre bore, laminate filtration construct can allow hollow ball layering to enter the chamber that backflows, laminate filtration construct include can slide and can layered filtration hollow ball cartridge structure, outer cylinder is located at the circumferentially spaced multiple drain open-works radially penetrated through of setting on the side wall in bottom of chamber portion of backflowing, the aperture size of drain open-work is greater than the outer diameter of hollow ball；The bottom of laminate filtration construct can seal sliding and be arranged in drilling fluid via hole.Deep water may be implemented by the device and become gradient well drilling, the excessive problem of single gradient well drilling tripping in casing program is well solved, it also solves the problems, such as to need large scale equipment in double-gradient well drilling simultaneously, reduces drilling cost, solve the problems, such as the narrow Density Window of deepwater drilling.
Description
Technical field
The present invention relates to petroleum drilling technology field more particularly to a kind of online regulation devices of drilling fluid density.
Background technique
In recent years, in the great oil-gas exploration and development that the whole world obtains, 50% comes from ocean, mainly deep water sea area, it is deep
Water sea area has become the important of oil-gas exploration and development in the world and takes over area.Deepwater petroleum exploration exploitation is just as world oil
The forward position of main growth factor and scientific and technical innovation, deep water will become the main battle ground of the following petroleum resources contention.
Drilling well is the key link of deepwater petroleum exploration exploitation, and deepwater drilling faces lot of challenges and risk: (1) depth of water band
The challenge come.With the increase of the depth of water, to drilling tool, drilling fluid, marine riser, the bearing capacity of platform, drilling machine load, deck space
Deng more stringent requirements are proposed, cost is increase accordingly.(2) stormy waves bring challenge.The stormy waves of deepwater environment can cause drill ship
Movement, cause marine riser to occur deforming and vortex-induced vibration, need higher fatigue design；Stormy waves stream is to riser system
Connection with subsea blowout preventer can also have an impact；Marine Storm Genesis is even more catastrophic destruction to drilling platforms.(3) low temperature bring
Challenge.Ocean temperature increases with well depth and is reduced, and bottom-water temperature can influence seabed mud line or less generally at 4 DEG C or so
About hundreds of meters of rock stratum causes the rheological characteristic of drilling fluid in marine riser to change, and increases the viscosity of drilling fluid and density, out
Existing gel effect brings difficulty to wellbore pressure control, and low temperature causes the setting time of aqueous drilling fluid to lengthen, and is easy
The channelling of existing fluid, causes the intensity of cement to decline.(4) hydrate bring challenge.If containing day in drilling process in well
Right gas, then hydrate is easy to occur.So that choke manifold, kill manifold, liquid-gas separator, preventer block, oil is interfered
The pressure monitoring of well.(5) narrow Drilling Fluids ' Safe Density Windows bring challenge.Undercompaction caused by deep water makes fracture pressure terraced
It spends relatively narrow the window between formation pore pressure gradient, be easy to cause drain spray to collapse the accidents such as card, cause casing program to increase, very
It can not extremely bore up to target zone, be greatly affected drilling depth and well construction period.Wherein, the narrow ' Safe Density Windows in stratum are asked
Topic is the most prominent, so that easily occurring the complex accidents such as leak, spray, collapsing, blocking in drilling process, develops band to deepwater petroleum exploration
Carry out huge security risk.If Amu Darya gas field reservoir is coral rock, fracture development, permeability is fabulous, and strata pressure window is very
It is narrow, since drilling fluid density is excessive in drilling process, severe mud losses occur.
Currently, deepwater drilling uses conventional single gradient well drilling technology, to cope with the narrow Density Window in stratum, usually only
The mode for increasing casing program is taken to reduce operating risk, to maintain to creep into.Disadvantage is that: singly open Open-Hole Section compared with
Short, casing program is more, for deep-well, it is difficult to bore and reach target zone.The dual-gradient drilling technology that the nineties in last century occurs is one
Determine solve the problems, such as narrow Density Window in deepwater drilling in degree, dual-gradient drilling technology is by infusing in marine riser annular space bottom
Enter low-density lightweight medium, reduces marine riser annular space drilling fluid density, be allowed to suitable with density of sea water, formed in the wellbore in this way
Two head of liquid gradients relatively broaden the density adjustable extent of the following drilling fluid in seabed.Although double-gradient well drilling is than single ladder
Degree drilling well has more advantage, but its there are still deficiencies: need large scale equipment (such as seabed lifting pump), increase drilling cost, and with
Petrol resources exploitation depth it is deeper and deeper, dual-gradient drilling technology can not completely address the narrow Density Window of deepwater drilling and ask
Topic, limitation also become increasingly conspicuous.
The present inventor based on years of experience and practice in relevant industries, proposes that a kind of drilling fluid density is online as a result,
Regulation device, to overcome the deficiencies of existing technologies.
Summary of the invention
The purpose of the present invention is to provide a kind of online regulation devices of drilling fluid density, and deep water may be implemented by the device
Become gradient well drilling, well solved the excessive problem of single gradient well drilling tripping in casing program, while also solving double gradients and boring
The problem of large scale equipment is needed in well reduces drilling cost, finally solves the problems, such as the narrow Density Window of deepwater drilling.
The object of the present invention is achieved like this, and a kind of online regulation device of drilling fluid density, the drilling fluid density exists
Line regulation device includes the hollow ball that outer cylinder and multiple density are less than drilling fluid density, is arranged up and down in the outer cylinder
Centre bore, the centre bore include the chamber that backflows, and the bottom connection setting diameter of the chamber that backflows is in the drilling fluid mistake for reducing setting
Hole, the laminate filtration construct for allowing drilling fluid downlink is arranged in the centre bore, and the laminate filtration construct can allow described
Hollow ball layering is backflowed chamber described in entering, the laminate filtration construct include can slide and energy layered filtration described in hollow ball
Cartridge structure, the outer cylinder is located at the circumferentially spaced multiple drains radially penetrated through of setting on the side wall in the bottom of chamber portion of backflowing
Open-work, the aperture size of the drain open-work are greater than the outer diameter of the hollow ball；The bottom of the laminate filtration construct
Sliding can be sealed to be arranged in the drilling fluid via hole.
In a preferred embodiment of the present invention, the laminate filtration construct includes being fixedly installed in the centre bore
The outer wall top seal of hollow fixed cylinder, the fixed cylinder is fixedly connected on the side wall of the centre bore, the fixed cylinder
It is set in distance between the outer wall for backflowing intracavitary and the side wall of the chamber that backflows, the bottom of the fixed cylinder is provided with
Tube end plate is fixed, the fixed cylinder bottom outlet of perforation is set on the fixed tube end plate；The fixed cylinder is located at the side of the chamber that backflows
Circumferentially spaced setting multiple first is backflowed through groove on wall；
The cartridge structure includes that the inner sealing of the fixed cylinder slides the first hollow filter cylinder for being arranged, and described first
First strainer is set in filter cylinder, and the bottom end seal of first filter cylinder slides through the fixed cylinder bottom outlet, first filter cylinder
Each described first can be blocked and backflow through groove and first filter cylinder can move down exposing each described first and backflow through groove, first filter
The first spring is arranged on the outer wall of cylinder, the top contact of first spring is described at the top of the outer wall of first filter cylinder
The bottom end contact of first spring is on the fixed tube end plate；The bottom of first filter cylinder is provided with the first filter cylinder bottom plate, institute
State the first filter cylinder bottom outlet that perforation is set on the first filter cylinder bottom plate；
First filter cylinder is located at circumferentially spaced setting multiple second on the side wall of the lower section of first strainer and backflows
Through groove；The cartridge structure further includes that the inner sealing of first filter cylinder slides the second hollow filter cylinder for being arranged, and described the
Second strainer is set in two filter cylinders, and the bottom end seal of second filter cylinder slides through to slide after the first filter cylinder bottom outlet and wear
In in the drilling fluid via hole, second filter cylinder can block each described second and backflow through groove and second filter cylinder can move down dew
It each described second backflows through groove out, second spring, the top top of the second spring is arranged on the outer wall of second filter cylinder
It is butted at the top of the outer wall of second filter cylinder, the bottom end of the second spring is resisted against on the first filter cylinder bottom plate；
Described first cross sectional dimensions for backflowing through groove is greater than the screen size on first strainer；First strainer
On screen size be greater than the described second cross sectional dimensions for backflowing through groove, the described second cross sectional dimensions for backflowing through groove is greater than
Screen size on second strainer.
In a preferred embodiment of the present invention, setting diameter is in increase setting at the top of the outer wall of first filter cylinder
First step portion, the outer wall in the first step portion can be sealed along the inner wall of the fixed cylinder to be slided, the top of first spring
Hold contact in the first step portion.
In a preferred embodiment of the present invention, setting diameter is in increase setting at the top of the outer wall of second filter cylinder
Second step portion, the outer wall in the second step portion can be sealed along the inner wall of first filter cylinder to be slided, the second spring
Top contact is in the second step portion.
In a preferred embodiment of the present invention, the side wall of the centre bore is equipped with internal diameter in the third for reducing setting
The outer wall top of stage portion, the fixed cylinder is equipped with diameter in the 4th stage portion for increasing setting, and the 4th stage portion can push up
It is butted in the third stage portion.
In a preferred embodiment of the present invention, the first connection of top side wall setting taper thread portion of the centre bore,
The conical surface that diameter reduces downwards is arranged in the outer wall bottom of the outer cylinder, the second connection of setting taper thread portion on the conical surface.
From the above mentioned, the online regulation device of drilling fluid density provided by the invention has the following beneficial effects:
(1) the online regulation device of drilling fluid density of the invention can be by being added the hollow of dimension in drilling fluid
Sphere regulates and controls the density into the drilling fluid at bore hole annulus different depth, thus it is more flexible, accurately control pit shaft pressure
Power realizes more gradient well drillings, solves the problems, such as the narrow Density Window of deepwater drilling；
(2) the online regulation device of drilling fluid density of the invention can well solve in shorter single gradient well drilling, under
Enter the excessive problem of casing program, while being conducive to well control control, reduces the probability of peril generation；
(3) when carrying out wellbore pressure Discrete control using the online regulation device of drilling fluid density of the invention, without large size
Equipment, reduce drilling cost, while with the increasing of Exploitation Depth, under limited casing program, very good solution
Single gradient and double-gradient well drilling are difficult to bore the problem of reaching target zone.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:
Fig. 1: structural schematic diagram when pitching non-for the online regulation device of drilling fluid density of the invention.
Fig. 2: structural schematic diagram when regulation device pitching online for drilling fluid density of the invention.
Fig. 3: the online regulation device use state schematic diagram of drilling fluid density of the invention when for double-gradient well drilling.
Fig. 4: the online regulation device use state schematic diagram of drilling fluid density of the invention when for more gradient well drillings.
In figure:
100, the online regulation device of drilling fluid density；
1, outer cylinder；
111, backflow chamber；112, drilling fluid via hole；
12, drain open-work；
13, third stage portion；
141, the first connection taper thread portion；142, the second connection taper thread portion；
15, the conical surface；
2, hollow ball；
30, fixed cylinder；
301, fixed tube end plate；302, it first backflows through groove；303, the 4th stage portion；
31, the first filter cylinder；
311, the first filter cylinder bottom plate；312, it second backflows through groove；313, first step portion；
32, the second filter cylinder；
321, second step portion；
41, the first strainer；42, the second strainer；
51, the first spring；52, second spring；
81, mineshaft annulus；
9, drilling rod.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
As shown in Figures 1 to 4, the present invention provides a kind of online regulation device 100 of drilling fluid density, in use, drilling fluid
The online regulation device 100 of density is serially connected on hollow drilling rod 9 (prior art)；The online regulation device 100 of drilling fluid density wraps
It includes outer cylinder 1 and multiple density is less than the hollow ball 2 (low-density lightweight medium) of drilling fluid density, multiple hollow balls 2 are used for
Regulate and control pitching operation when drilling fluid density, the dimensions of hollow ball 2 is determined according to practical application, is filled out in mineshaft annulus 81
Hollow ball 2 is filled, then its amount for accommodating drilling fluid reduces, to reduce the drilling fluid in the mineshaft annulus 81 of corresponding well section
Density；
As depicted in figs. 1 and 2, the centre bore of setting up and down in outer cylinder 1, centre bore include the chamber 111 that backflows, and backflow chamber
For 111 bottom connection setting diameter in the drilling fluid via hole 112 being arranged is reduced, being arranged in centre bore allows drilling fluid downlink
Laminate filtration construct, laminate filtration construct can allow the layering of hollow ball 2 to enter the chamber 111 that backflows, and laminate filtration construct includes energy
The cartridge structure of sliding and energy layered filtration hollow ball 2, laminate filtration construct are divided according to the dimensions of hollow ball 2
Other layered filtration, the biggish hollow ball 2 of outer diameter are located at the upper layer of the lesser hollow ball 2 of outer diameter；Outer cylinder 1 is located at the chamber that backflows
The circumferentially spaced multiple drain open-works 12 radially penetrated through of setting, the aperture size of drain open-work 12 are big on the side wall of 111 bottoms
In the outer diameter of hollow ball 2；The bottom of laminate filtration construct can seal sliding and be arranged in drilling fluid via hole 112.
The online regulation device 100 of drilling fluid density of the invention can be by being added the hollow of dimension in drilling fluid
Sphere regulates and controls the density into the drilling fluid at bore hole annulus different depth, thus it is more flexible, accurately control pit shaft pressure
Power realizes more gradient well drillings, solves the problems, such as the narrow Density Window of deepwater drilling；The online regulation device of drilling fluid density of the invention
100 can well solve in shorter single gradient well drilling, the excessive problem of tripping in casing program, while be conducive to well control control
System reduces the probability of peril generation；Wellbore pressure is carried out using the online regulation device 100 of drilling fluid density of the invention
When Discrete control, without large-scale equipment, drilling cost is reduced, while with the increasing of Exploitation Depth, in limited casing
Under level, the problem of single gradient of very good solution and double-gradient well drilling are difficult to bore up to target zone.
Further, as depicted in figs. 1 and 2, laminate filtration construct includes the hollow fixed cylinder being fixedly installed in centre bore
30, the outer wall top seal of fixed cylinder 30 is fixedly connected on the side wall of centre bore, and fixed cylinder 30 is outer in chamber 111 positioned at backflowing
It is set in distance between wall and the side wall for the chamber 111 that backflows, the bottom of fixed cylinder 30 is provided with fixed tube end plate 301, fixed cylinder bottom
The fixed cylinder bottom outlet of perforation is set on plate 301；Fixed cylinder 30 is located at circumferentially spaced setting multiple the on the side wall for the chamber 111 that backflows
One backflows through groove 302；
Cartridge structure includes that the inner sealing of fixed cylinder 30 slides the first hollow filter cylinder 31 for being arranged, in the first filter cylinder 31
First strainer 41 is set, and the bottom end seal of the first filter cylinder 31 slides through fixed cylinder bottom outlet, and the first filter cylinder 31 can block each first
Through groove of backflowing 302 and the first filter cylinder 31 can move down exposing each first and backflow through groove 302, on normal drilling state and the first strainer 41
Hollow ball when the first filter cylinder 31 being insufficient to allow to move down, the radially inner side of 31 self-retaining cylinder 30 of the first filter cylinder blocks each first and returns
Flow through groove 302；When the hollow ball on the first strainer 41 moves down the first filter cylinder 31, each first through groove 302 of backflowing can be connected to
30 inner cavity of fixed cylinder and the chamber 111 that backflows.
The first spring 51 is arranged on the outer wall of first filter cylinder 31, the top contact of the first spring 51 is in the first filter cylinder 31
At the top of outer wall, the bottom end contact of the first spring 51 is on fixed tube end plate 301；The bottom of first filter cylinder 31 is provided with the first filter cylinder
The first filter cylinder bottom outlet of perforation is arranged on first filter cylinder bottom plate 311 for bottom plate 311；
First filter cylinder 31 is located at circumferentially spaced setting multiple second on the side wall of the lower section of the first strainer 41 and backflows through groove
312；Cartridge structure further includes that the inner sealing of the first filter cylinder 31 slides the second hollow filter cylinder 32 for being arranged, in the second filter cylinder 32
Second strainer 42 is set, and sliding is arranged in drilling fluid via hole after the bottom end seal of the second filter cylinder 32 slides through the first filter cylinder bottom outlet
In 112, the second filter cylinder 32 can block each second and backflow through groove 312 and the second filter cylinder 32 can move down exposing each second and backflow through groove
312, when the hollow ball on normal drilling state and the second strainer 42 is insufficient to allow the second filter cylinder 32 to move down, the second filter cylinder 32 from
The radially inner side of first filter cylinder 31 blocks each second and backflows through groove 312；When the hollow ball on the second strainer 42 makes the second filter cylinder
32 when moving down, and each second through groove 312 of backflowing can be connected to 31 inner cavity of the first filter cylinder and the chamber 111 that backflows.
Second spring 52 is arranged on the outer wall of second filter cylinder 32, the top contact of second spring 52 is in the second filter cylinder 32
At the top of outer wall, the bottom end of second spring 52 is resisted against on the first filter cylinder bottom plate 311；
First cross sectional dimensions for backflowing through groove 302 is greater than the screen size on the first strainer 41；On first strainer 41
Screen size is greater than the second cross sectional dimensions for backflowing through groove 312, and the second cross sectional dimensions for backflowing through groove 312 is greater than the second filter
Screen size on net 42.When putting into the hollow ball of two kinds of specifications in drilling fluid, biggish hollow ball is by the first strainer
41 intercept and accumulate in the first filter cylinder 31, when the first filter cylinder 31 moves down, expose first backflow through groove 302 when, biggish hollow sphere
Body backflows chamber 111 through the first inflow of through groove 302 of backflowing；Lesser hollow ball flows downward from the sieve pore on the first strainer 41,
Accumulated in the second filter cylinder 32 by the interception of the second strainer 42, when the second filter cylinder 32 moves down, expose second backflow through groove 312 when, compared with
Small hollow ball backflows chamber 111 through the second inflow of through groove 312 of backflowing.
First backflow the cross sectional dimensions of through groove 302, the screen size on the first strainer 41, second backflow through groove 312
Screen size on cross sectional dimensions, the second strainer 42 needs to match setting with the specification of hollow ball.
Further, first step portion 313 of the setting diameter in increase setting, first step at the top of the outer wall of the first filter cylinder 31
The outer wall in portion 313 can be sealed along the inner wall of fixed cylinder 30 and be slided, and the top contact of the first spring 51 is in first step portion 313.
Further, as depicted in figs. 1 and 2, second that setting diameter is arranged in increase at the top of the outer wall of the second filter cylinder 32
Rank portion 321, the outer wall in second step portion 321 can be sealed along the inner wall of the first filter cylinder 31 to be slided, the top contact of second spring 52
In in second step portion 321.
Further, as depicted in figs. 1 and 2, the side wall of centre bore is equipped with the third stage portion 13 that internal diameter is arranged in reduction,
The outer wall top of fixed cylinder 30 is equipped with diameter in the 4th stage portion 303 for increasing setting, and 303 energy contact of the 4th stage portion is in third
In stage portion 13.
Further, as depicted in figs. 1 and 2, the first connection of top side wall setting taper thread portion 141 of centre bore, outer cylinder 1
The conical surface 15 that diameter reduces downwards is arranged in outer wall bottom, the second connection of setting taper thread portion 142 on the conical surface.
The online regulation device 100 of drilling fluid density of the invention use process is as follows:
The online regulation device 100 of drilling fluid density of the invention is serially connected on drilling rod 9, drilling fluid density of the invention exists
Line regulation device 100 is in 9 lower going-into-well of drilling rod；
In normal drilling process, it is not required to that hollow ball 2 is added from the drilling fluid that well head injects, the first filter cylinder 31 blocks respectively
First backflows through groove 302, and the second filter cylinder 32 blocks each second and backflows through groove 312, and drilling fluid regulates and controls dress through drilling fluid density online
Set 9 inner cavity of drilling rod, the centre bore, 30 inner cavity of fixed cylinder, 31 inner cavity of the first filter cylinder, 32 inner cavity of the second filter cylinder, drilling fluid of 100 tops
9 inner cavity of drilling rod of via hole 112 and online 100 lower section of regulation device of drilling fluid density flows to drill bit；
When needing to carry out double-gradient well drilling, as shown in figure 3, concatenate a drilling fluid density on drilling rod 9 regulates and controls dress online
100 are set, two kinds of specification hollow balls 2 are successively added from the drilling fluid that well head injects, the setting biggish hollow ball 2 of outer diameter is
First hollow ball, the setting lesser hollow ball 2 of outer diameter are the second hollow ball, the outer diameter of the first hollow ball and the
Screen size on one strainer 41 matches setting, the outer diameter of the second hollow ball with and the second strainer 42 on screen size
Matching is arranged, and the second hollow ball is first put into drilling fluid and puts into the first hollow ball again, the second hollow ball passes through the first filter
Sieve pore on net 41 flows downward on the second strainer 42, and the second hollow ball accumulates in the second filter cylinder by the interception of the second strainer 42
In 32, the sum of downlink impact force of gravity and drilling fluid of the second hollow ball and the second filter cylinder 32 is greater than second spring 52
When active force, the second filter cylinder 32 is moved down, and is exposed second and is backflowed through groove 312, and the second hollow ball is flowed into through the second through groove 312 of backflowing
Backflow chamber 111；First hollow ball is accumulated in the first filter cylinder 31 by the interception of the first strainer 41, the first hollow ball and the first filter
When the sum of gravity and the downlink impact force of drilling fluid of cylinder 31 are greater than the active force of the first spring 51, the first filter cylinder 31 is moved down,
Expose first to backflow through groove 302, the first hollow ball backflows chamber 111 through the first inflow of through groove 302 of backflowing；It backflows in chamber 111
First hollow ball, the second hollow ball enter in mineshaft annulus 81 through drain open-work 12, the first hollow ball, the second hollow sphere
Body is effectively reduced drilling fluid density in the mineshaft annulus 81 of online 100 or more the regulation device of drilling fluid density, at this point, with drilling well
The online regulation device 100 of liquid density is line of demarcation, and the drilling fluid density in mineshaft annulus 81 is divided into two values, more than line of demarcation
Drilling fluid density is less than line of demarcation drilling fluid density below, to realize double-gradient well drilling.
When needing to carry out more gradient well drillings, concatenates multiple drilling fluid densities at interval in the upper and lower on drilling rod 9 and regulate and control dress online
100 are set, the hollow ball 2 that plurality of specifications is added is needed from the drilling fluid that well head injects.As shown in figure 4, in a tool of the invention
In body application examples, the online regulation device 100 of two drilling fluid densities is concatenated on drilling rod 9, the drilling fluid density for setting top is online
Regulation device 100 is the online regulation device of the first drilling fluid density, and the online regulation device 100 of drilling fluid density for setting lower section is
The sieve diameter of the online regulation device of second drilling fluid density, each sieve in the online regulation device of the second drilling fluid density is less than
The sieve diameter of corresponding sieve in the online regulation device of first drilling fluid density needs to carry out drilling fluid in mineshaft annulus 81
Density adjusting when, put into the online regulation device of the second drilling fluid density two kinds of hollow balls 2 outer diameter be less than investment
The hollow ball 2 of the online regulation device of first drilling fluid density puts into two kinds of skies of the online regulation device of the second drilling fluid density
The outer diameter of bulbus cordis body 2 is respectively less than the screen size in the online regulation device of the first drilling fluid density on the second strainer 42, protects
Demonstrate,proving two kinds of hollow balls 2 can flow into the online regulation device of the second drilling fluid density, and backflow through groove by first respectively
302, second through groove 312 is backflowed into the chamber 111 that backflows, then pass through drain open-work 12 and enter in mineshaft annulus 81, complete second and bore
The density adjusting in the mineshaft annulus 81 more than online regulation device of well liquid density completes the second drilling fluid density and regulates and controls dress online
After the hollow ball investment operation set, the hollow ball for carrying out the online regulation device of the first drilling fluid density puts into operation, completes
The density adjusting in the mineshaft annulus 81 more than online regulation device of first drilling fluid density, the first drilling fluid density of investment are online
Hollow ball in regulation device is more than the hollow ball for putting into the online regulation device of the second drilling fluid density.In entire pit shaft ring
On the section of sky 81, the distribution density of hollow ball 2 is presented three values, and the above are for the online regulation device of the first drilling fluid density
One level is the second level between the online regulation device of the first drilling fluid density and the online regulation device of the second drilling fluid density,
The following are third level, the hollow ball concentration of the first level to be greater than the second level for the online regulation device of second drilling fluid density
Hollow ball concentration, the hollow ball concentration of the second level is greater than the hollow ball concentration of third level, so that first layer
For the drilling fluid density in face less than the drilling fluid density of the second level, the drilling fluid density of the second level is less than the drilling well of third level
Liquid density, the drilling fluid density in mineshaft annulus 81 is graded regulation, to realize more gradient well drillings, it is narrow close to solve deepwater drilling
Spend window issue.
From the above mentioned, the online regulation device of drilling fluid density provided by the invention has the following beneficial effects:
(1) the online regulation device of drilling fluid density of the invention can be by being added the hollow of dimension in drilling fluid
Sphere regulates and controls the density into the drilling fluid at bore hole annulus different depth, thus it is more flexible, accurately control pit shaft pressure
Power realizes more gradient well drillings, solves the problems, such as the narrow Density Window of deepwater drilling；
(2) the online regulation device of drilling fluid density of the invention can well solve in shorter single gradient well drilling, under
Enter the excessive problem of casing program, while being conducive to well control control, reduces the probability of peril generation；
(3) when carrying out wellbore pressure Discrete control using the online regulation device of drilling fluid density of the invention, without large size
Equipment, reduce drilling cost, while with the increasing of Exploitation Depth, under limited casing program, very good solution
Single gradient and double-gradient well drilling are difficult to bore the problem of reaching target zone.
The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is any
Those skilled in the art, made equivalent changes and modifications under the premise of not departing from design and the principle of the present invention,
It should belong to the scope of protection of the invention.
Claims (5)
1. a kind of online regulation device of drilling fluid density, which is characterized in that the online regulation device of drilling fluid density includes outer
Cylinder and multiple density are less than the hollow ball of drilling fluid density, the centre bore of setting up and down, the center in the outer cylinder
Hole includes the chamber that backflows, and the bottom of the chamber that backflows, which is connected to, is arranged the drilling fluid via hole that diameter is arranged in reduction, in the centre bore
It is arranged with the laminate filtration construct for allowing drilling fluid downlink, the laminate filtration construct can allow the hollow ball layering to enter
The chamber that backflows, the laminate filtration construct include can slide and can hollow ball described in layered filtration cartridge structure, it is described
It is saturating that outer cylinder is located at the circumferentially spaced multiple drain open-works radially penetrated through of setting, the drain on the side wall in the bottom of chamber portion of backflowing
The aperture size in hole is greater than the outer diameter of the hollow ball；The bottom of the laminate filtration construct can seal sliding and be arranged in
In the drilling fluid via hole；
The laminate filtration construct includes the hollow fixed cylinder being fixedly installed in the centre bore, on the outer wall of the fixed cylinder
Portion is sealedly and fixedly connected on the side wall of the centre bore, and the fixed cylinder is located at the outer wall for backflowing intracavitary and backflows with described
It is set in distance between the side wall of chamber, the bottom of the fixed cylinder is provided with fixed tube end plate, is arranged on the fixed tube end plate
The fixed cylinder bottom outlet of perforation；The fixed cylinder is located at circumferentially spaced setting multiple first on the side wall of the chamber that backflows and backflows
Slot；
The cartridge structure includes that the inner sealing of the fixed cylinder slides the first hollow filter cylinder being arranged, first filter cylinder
The first strainer of interior setting, the bottom end seal of first filter cylinder slide through the fixed cylinder bottom outlet, and first filter cylinder can hide
It keeps off each described first and backflows through groove and first filter cylinder can move down exposing each described first and backflow through groove, first filter cylinder
The first spring is arranged on outer wall, the top contact of first spring is at the top of the outer wall of first filter cylinder, and described first
The bottom end contact of spring is on the fixed tube end plate；The bottom of first filter cylinder is provided with the first filter cylinder bottom plate, and described
First filter cylinder bottom outlet of perforation is set on one filter cylinder bottom plate；
First filter cylinder is located at circumferentially spaced setting multiple second on the side wall of the lower section of first strainer and backflows through groove；
The cartridge structure further includes that the inner sealing of first filter cylinder slides the second hollow filter cylinder being arranged, second filter cylinder
The second strainer of interior setting, the bottom end seal of second filter cylinder slide through sliding after the first filter cylinder bottom outlet be arranged in it is described
In drilling fluid via hole, second filter cylinder can block each described second and backflow through groove and second filter cylinder can move down and expose each institute
It states second to backflow through groove, second spring is arranged on the outer wall of second filter cylinder, the top contact of the second spring is in institute
At the top of the outer wall for stating the second filter cylinder, the bottom end of the second spring is resisted against on the first filter cylinder bottom plate；
Described first cross sectional dimensions for backflowing through groove is greater than the screen size on first strainer；On first strainer
Screen size is greater than the described second cross sectional dimensions for backflowing through groove, and the described second cross sectional dimensions for backflowing through groove is greater than described
Screen size on second strainer.
2. the online regulation device of drilling fluid density as described in claim 1, which is characterized in that the outer wall top of first filter cylinder
Diameter is arranged in the first step portion for increasing setting in portion, and the outer wall in the first step portion can be sealed along the inner wall of the fixed cylinder
Sliding, the top contact of first spring is in the first step portion.
3. the online regulation device of drilling fluid density as claimed in claim 1 or 2, which is characterized in that outside second filter cylinder
For setting diameter in the second step portion for increasing setting, the outer wall in the second step portion can be along first filter cylinder at the top of wall
Wall sealing sliding, the top contact of the second spring is in the second step portion.
4. the online regulation device of drilling fluid density as described in claim 1, which is characterized in that set on the side wall of the centre bore
There is internal diameter in the third stage portion for reducing setting, the outer wall top of the fixed cylinder is equipped with diameter in the 4th step for increasing setting
Portion, the 4th stage portion energy contact is in the third stage portion.
5. the online regulation device of drilling fluid density as described in claim 1, which is characterized in that the top side wall of the centre bore
The first connection of setting taper thread portion, the outer wall bottom of the outer cylinder is arranged the conical surface that diameter reduces downwards, is arranged on the conical surface
Second connection taper thread portion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810263801.5A CN108425650B (en) | 2018-03-28 | 2018-03-28 | The online regulation device of drilling fluid density |
| AU2019202097A AU2019202097B2 (en) | 2018-03-28 | 2019-03-27 | Drilling fluid density online regulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810263801.5A CN108425650B (en) | 2018-03-28 | 2018-03-28 | The online regulation device of drilling fluid density |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108425650A CN108425650A (en) | 2018-08-21 |
| CN108425650B true CN108425650B (en) | 2019-06-14 |
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|---|---|---|---|
| CN201810263801.5A Active CN108425650B (en) | 2018-03-28 | 2018-03-28 | The online regulation device of drilling fluid density |
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|---|---|
| CN (1) | CN108425650B (en) |
| AU (1) | AU2019202097B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111764850B (en) * | 2020-06-22 | 2022-02-25 | 中国石油大学(北京) | Hollow ball filtering and separating device and drilling string |
| CN113323610B (en) * | 2021-07-15 | 2024-05-28 | 中国海洋石油集团有限公司 | Drilling fluid injection device of submarine drilling machine, submarine drilling machine and injection method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6530437B2 (en) * | 2000-06-08 | 2003-03-11 | Maurer Technology Incorporated | Multi-gradient drilling method and system |
| WO2007102971A2 (en) * | 2006-03-06 | 2007-09-13 | Exxonmobil Upstream Research Company | Method and apparatus for managing variable density drilling mud |
| CN100412311C (en) * | 2006-10-12 | 2008-08-20 | 中国海洋石油总公司 | Method and apparatus for realizing double-gradient well drilling |
| US20100155063A1 (en) * | 2008-12-23 | 2010-06-24 | Pdti Holdings, Llc | Particle Drilling System Having Equivalent Circulating Density |
| CA2910218C (en) * | 2013-05-31 | 2018-02-13 | Halliburton Energy Services, Inc. | Well monitoring, sensing, control, and mud logging on dual gradient drilling |
| US20160084083A1 (en) * | 2014-09-23 | 2016-03-24 | Gilbert Alan Hice | Borehole Mining System and Methods Using Sonic-Pulsed Jetting Excavation and Eductor Slurry Recovery Apparatus |
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2018
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| Publication number | Publication date |
|---|---|
| CN108425650A (en) | 2018-08-21 |
| AU2019202097A1 (en) | 2019-10-17 |
| AU2019202097B2 (en) | 2020-07-09 |
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