AU2019202100A1 - Drilling fluid density segmented regulation device - Google Patents
Drilling fluid density segmented regulation device Download PDFInfo
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- AU2019202100A1 AU2019202100A1 AU2019202100A AU2019202100A AU2019202100A1 AU 2019202100 A1 AU2019202100 A1 AU 2019202100A1 AU 2019202100 A AU2019202100 A AU 2019202100A AU 2019202100 A AU2019202100 A AU 2019202100A AU 2019202100 A1 AU2019202100 A1 AU 2019202100A1
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- 239000012530 fluid Substances 0.000 title claims abstract description 152
- 238000005553 drilling Methods 0.000 title claims abstract description 146
- 230000033228 biological regulation Effects 0.000 title claims abstract description 45
- 238000004891 communication Methods 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 238000011161 development Methods 0.000 description 9
- 230000018109 developmental process Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003643 water by type 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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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
Abstract The present invention relates to a drilling fluid density segmented regulation device, comprising a joint body; the joint body is provided with a central hole, the central hole is composed of a diameter-constant straight hole and a tapered hole, and the joint body is provided with fluid discharge through-holes; the diameter-constant straight hole is provided therein with a guide impeller barrel, the guide impeller barrel is provided therein with a backflow fluid through hole, the guide impeller barrel is fixedly provided with a fluid discharge pipe, the fluid discharge pipe is in sealed communication with the fluid discharge through-holes, the guide impeller barrel is fixedly provided with an overflow pipe, and the overflow pipe is disposed in sealed communication with the backflow fluid through hole. Deep-water variable-gradient drilling can be realized by the device, thereby reducing the drilling cost, and solving the problem of the narrow-density window in deep-water drilling.
Description
Cross-reference to related applications [0001] This application claims priority to Chinese Patent Application No. 201810263287.5 , filed on March 28, 2018, which is incorporated herein by reference in its entirety.
Technical Field [0002] The present invention relates to the technical field of oil drilling, and in particular to a drilling fluid density segmented regulation device.
Background Art [0003] In recent years, 50% of the major oil and gas explorations and developments in the world are carried out in the ocean, mainly in the deep-water areas, which have become the important substitution areas for international oil and gas explorations and developments. The deep-water oil and gas exploration and development is becoming a main growth point of the oil on earth and a frontier of technological innovation, and the deep-water areas will become the main battlefield for future competitions in oil and gas resources.
[0004] The drilling is a key link in deep-water oil and gas exploration and development, and the deep-water drilling faces many challenges and risks: 1) The challenge brought by the water depth. With the increase of the water depth, higher requirements are imposed on the drilling tool, the drilling fluid, the marine riser, the platform bearing capacity, the drilling rig load, the deck space, etc., and the cost is correspondingly increased. 2) The challenge brought by the wind waves. The wind waves in the deep-water environment will cause the movement of the drilling ship, resulting in the deformation and vortex-induced vibration of the marine riser, so a higher fatigue strength design is required; the wind waves current can also affect the connection between the marine riser system and the underwater blowout preventer; and the ocean storms are even catastrophic damages to the drilling platform. 3) The challenge brought by the low temperature. The seawater temperature decreases as the well depth increases and the seabed temperature is generally about 4 °C; the rock formations of several hundred meters below the seabed mud line are also affected, as a result, the rheological properties of the drilling fluid in the marine riser are changed, the viscosity and density of the drilling fluid are increased, and the gel effect occurs, which makes it difficult to control the wellbore pressure; in addition, the low temperature prolongs the solidification time of the drilling fluid, and the fluid channeling is liable to occur, resulting in a decrease of the cement i
2019202100 27 Mar 2019 strength. 4) The challenge brought by hydrates. Hydrates are very easy to occur if the well contains natural gases during the drilling. As a result, the throttle manifold, the kill manifold, the liquid-gas separator, and the blowout preventer are blocked, which hinders the pressure monitoring of the oil well. 5) The challenge brought by a narrow drilling fluid safety density window. The under-compaction caused by the deep waters leads to a narrow window between the fracture pressure gradient and the formation pore pressure gradient, which can easily cause accidents such as leakage, blowout, collapse and blocking, resulting in an increase of the casing layers, and it is even impossible to reach the target layer, so the drilling depth and the construction cycle are greatly affected. In which, the problem of formation narrow safety density window is the most prominent, which can easily cause complex accidents such as leakage, blowout, collapse, and blocking, and bring great potential safety hazards to the deep-water oil and gas exploration and development during the drilling. For example, the reservoirs of the Amu Darya gas field are composed of reef limestone with developed cracks, excellent permeability, and very narrow formation pressure window, so the vicious leakage will occur during drilling due to the excessive drilling fluid density.
[0005] At present, deep-water drilling uses the conventional single-gradient drilling technology. In order to deal with the narrow-density window of the formation, usually the operational risk is only reduced by increasing the casing layers to maintain the drilling. The disadvantages lie in that the single open hole section is short, the number of casing layers is large, and it is difficult to reach the target layer for deep wells. The dual-gradient drilling technology occurred in the 1990s solves the problem of narrow-density window in the deep-water drilling to some extent. The dual-gradient drilling technology is to inject a low-density light medium into a bottom portion of a marine riser annulus, and reduce a drilling fluid density in the marine riser annulus to make it be equal to the seawater density, so that two liquid column pressure gradients are formed in the wellbore, and the drilling fluid density below the seabed can be adjusted within a wider range. Although the dual-gradient drilling is more advantages than the single-gradient drilling, it still disadvantageous in that large equipment (such as the submarine lift pump) is needed, and the drilling cost is increased; in addition, with the increase of development depth of the oil and gas resources, the dual-gradient drilling technology can not completely solve the problem of narrow-density window in deep-water drilling, and its limitation is also increasingly prominent.
[0006] Therefore, by virtue of years of experiences and practices in related industries, the inventor proposes a drilling fluid density segmented regulation device to overcome the defects of the prior art.
2019202100 27 Mar 2019
Summary of the Disclosure [0007] An objective of the present invention is to provide a drilling fluid density segmented regulation device. Deep-water variable-gradient drilling can be realized by the device, which well solves the problem that excessive layers of casings are set in the single-gradient drilling, and the problem that the large equipment is required in the dual-gradient drilling, thereby reducing the drilling cost, and finally solving the problem of narrow-density window in the deep-water drilling.
[0008] The objective of the present invention is achieved by a drilling fluid density segmented regulation device, comprising a barrel-shaped joint body and a plurality of hollow spheres having a density less than a drilling fluid density; the joint body is provided with a central hole penetrating axially, the central hole is composed of a diameter-constant straight hole and a diameter-decreasing downward tapered hole which are communicated with each other vertically, and a sidewall of the joint body located on a top portion of the diameter-constant straight hole is provided with a plurality of fluid discharge through-holes each having an inner diameter larger than a diameter of the hollow sphere;
[0009] a guide impeller barrel is provided to sleeve an end of the diameter-constant straight hole close to the tapered hole, the guide impeller barrel is provided therein with a plurality of vanes which are disposed to be oblique axially and spaced apart from each other circumferentially, an axial passage is formed between the vanes adjacent to each other to allow the hollow spheres and the drilling fluid to move downward, and the guide impeller barrel is provided therein with a backflow fluid through hole penetrating axially to allow the hollow spheres and the drilling fluid to backflow upward; a top portion of the guide impeller barrel is fixedly provided with a fluid discharge pipe extending upward, an inner cavity of the fluid discharge pipe is disposed in sealed communication with a top portion of the backflow fluid through hole, and a top portion of the fluid discharge pipe is in sealed communication with each of the fluid discharge through-holes via a plurality of transition pipes which are provided to be spaced apart from each other circumferentially; a bottom portion of the guide impeller barrel is fixedly provided with an overflow pipe extending downward, an inner cavity of the overflow pipe is disposed in sealed communication with a bottom portion of the backflow fluid through hole, and a bottom opening of the overflow pipe is located in the tapered hole; an inner diameter of the fluid discharge pipe and an inner diameter of the overflow pipe are both larger than the diameter of the hollow sphere.
[0010] In a preferred embodiment of the present invention, the guide impeller barrel comprises an impeller outer barrel in which an impeller inner barrel is sleeved coaxially, and an inner cavity of the impeller inner barrel constitutes the backflow fluid through hole.
2019202100 27 Mar 2019 [0011] In a preferred embodiment of the present invention, the guide impeller barrel comprises an impeller outer barrel in which an impeller inner barrel is sleeved coaxially, the fluid discharge pipe and the overflow pipe are composed of a pipe body which sealedly passes through the impeller inner barrel, a portion of the pipe body located above the guide impeller barrel constitutes the fluid discharge pipe, a portion of the pipe body located below the guide impeller barrel constitutes the overflow pipe, and an inner cavity of the pipe body constitutes the backflow fluid through hole.
[0012] In a preferred embodiment of the present invention, a radial inner side of each of the vanes is connected to an outer wall of the impeller inner barrel, and a radial outer side of each of the vanes is connected to an inner wall of the impeller outer barrel.
[0013] In a preferred embodiment of the present invention, an outer wall of the impeller outer barrel is fixedly connected to an inner wall of the diameter-constant straight hole by threaded sealing.
[0014] In a preferred embodiment of the present invention, the inner wall of the diameter-constant straight hole located below the impeller outer barrel is provided with a first step portion having a top surface disposed to abut against a bottom surface of the impeller outer barrel.
[0015] In a preferred embodiment of the present invention, an upper portion of a sidewall of the diameter-constant straight hole is provided with a first connection taper-thread portion, a bottom portion of an outer wall of the joint body is provided with a diameter-decreasing downward tapered surface, and the tapered surface is provided with a second connection taper-thread portion.
[0016] As can be seen from the above description, the drilling fluid density segmented regulation device provided by the present invention has the following beneficial effects:
[0017] 1) the drilling fluid density segmented regulation device of the present invention can regulate densities of drilling fluids arriving at different depths of a borehole annulus by injecting hollow spheres of corresponding sizes into the drilling fluid, thereby more flexibly and accurately controlling the wellbore pressure, and achieving the multi-gradient drilling to solve the problem of narrow-density window in the deep-water drilling;
[0018] 2) the drilling fluid density segmented regulation device of the present invention can well solve the problem that excessive layers of casings are set in a short single-gradient drilling, while benefiting the well control to reduce the probability of dangerous accidents;
[0019] 3) any large equipment is not required when the drilling fluid density segmented regulation device of the present invention is used for the wellbore pressure segmented control, which reduces the drilling cost; at the same time, with the increase of development depth,
2019202100 27 Mar 2019 under the limited layers of casing, the problem that it is difficult to reach the target layer in the single-gradient and double-gradient drilling can be well solved.
Brief Description of the Drawings [0020] The following drawings are only intended to illustrate and explain the present invention, rather than limiting the scope of the present invention. In which, [0021] Fig. 1 is a structural schematic diagram of a drilling fluid density segmented regulation device in the present invention;
[0022] Fig. 2 is a use state schematic diagram of a drilling fluid density segmented regulation device during dual-gradient drilling in the present invention;
[0023] Fig. 3 is a use state schematic diagram of a drilling fluid density segmented regulation device during multi-gradient drilling in the present invention.
[0024] In the drawings:
[0025] 100: drilling fluid density segmented regulation device;
[0026] 1: joint body;
[0027] 11: diameter-constant straight hole;
[0028] 12: tapered hole;
[0029] 13: fluid discharge through-hole;
[0030] 14: first step portion;
[0031] 15: tapered surface;
[0032] 161: first connection taper-thread portion; 162: second connection taper-thread portion;
[0033] 2: hollow sphere;
[0034] 3: guide impeller barrel;
[0035] 31: vane; 32: impeller outer barrel; 33: impeller inner barrel;
[0036] 41: fluid discharge pipe; 42: transition pipe; 43: overflow pipe;
[0037] 81: borehole annulus;
[0038] 9: drill stem.
Detailed Description of the Preferred Embodiments [0039] In order to more clearly understand the technical features, objectives and effects of the present invention, now the embodiments of the present invention are described with reference to the drawings.
[0040] As illustrated in Figs. 1 to 3, the present invention provides a drilling fluid density segmented regulation device 100; in use, the drilling fluid density segmented regulation
2019202100 27 Mar 2019 device 100 is connected in series to a hollow drill stem 9 (the prior art); the drilling fluid density segmented regulation device 100 comprises a barrel-shaped joint body 1 and a plurality of hollow spheres 2 having a density less than a drilling fluid density; and the plurality of hollow spheres 2 are used for a sphere injection operation when the drilling fluid density is regulated in segments.
[0041] As illustrated in Fig. 1, the joint body 1 is provided with a central hole penetrating axially; the central hole is composed of a diameter-constant straight hole 11 and a diameter-decreasing downward tapered hole 12 which are communicated with each other vertically; a sidewall of the joint body 1 located on a top portion of the diameter-constant straight hole 11 is provided with a plurality of fluid discharge through-holes 13 each having an inner diameter larger than a diameter of the hollow sphere; in a specific embodiment of the present invention, there are two fluid discharge through-holes which are radially symmetrically disposed; a guide impeller barrel 3 is provided to sleeve an end of the diameter-constant straight hole 11 close to the tapered hole 12; the guide impeller barrel 3 is provided therein with a plurality of vanes 31 which are disposed to be obligue axially and spaced apart from each other circumferentially; an axial passage is formed between the vanes 31 adjacent to each other to allow the hollow spheres 2 and the drilling fluid to move downward; the injected drilling fluid impacts each of the vanes downward, and each of the vanes disposed obliguely causes the drilling fluid and the injected hollow spheres to swirl downward; the guide impeller barrel 3 is provided therein with a backflow fluid through hole penetrating axially to allow the hollow spheres and the drilling fluid to backflow upward; a top portion of the guide impeller barrel 3 is fixedly provided with a fluid discharge pipe 41 extending upward, an inner cavity of the fluid discharge pipe 41 is disposed in sealed communication with a top portion of the backflow fluid through hole, and a top portion of the fluid discharge pipe 41 is in sealed communication with each of the fluid discharge through-holes 13 via a plurality of transition pipes 42; a bottom portion of the guide impeller barrel 3 is fixedly provided with an overflow pipe 43 extending downward, an inner cavity of the overflow pipe 43 is disposed in sealed communication with a bottom portion of the backflow fluid through hole, and a bottom opening of the overflow pipe 43 is located in the tapered hole 12; an inner diameter of the fluid discharge pipe 41 and an inner diameter of the overflow pipe 43 are both larger than the diameter of the hollow sphere.
[0042] The drilling fluid density segmented regulation device 100 of the present invention can regulate densities of drilling fluids arriving at different depths of a borehole annulus by injecting hollow spheres of corresponding sizes into the drilling fluid, thereby more flexibly and accurately controlling the wellbore pressure, and achieving the multi-gradient drilling to solve
2019202100 27 Mar 2019 the problem of narrow-density window in the deep-water drilling. The drilling fluid density segmented regulation device 100 of the present invention can well solve the problem that excessive layers of casings are set in a short single-gradient drilling, while benefiting the well control to reduce the probability of dangerous accidents. Any large equipment is not required when the drilling fluid density segmented regulation device 100 of the present invention is used for the wellbore pressure segmented control, which reduces the drilling cost; at the same time, with the increase of the development depth, under the limited layers of casing, the problem that it is difficult to reach the target layer in the single-gradient and double-gradient drilling can be well solved.
[0043] Further, as illustrated in Fig. 1, the guide impeller barrel 3 comprises an impeller outer barrel 32 in which an impeller inner barrel 33 is sleeved coaxially, and an inner cavity of the impeller inner barrel 33 constitutes the backflow fluid through hole. In a specific embodiment of the present invention, a top portion of an inner wall of the impeller inner barrel 33 is provided with an upper threaded portion, and is in sealed connection with the fluid discharge pipe 41 via the upper threaded portion; a bottom portion of the inner wall of the impeller inner barrel 33 is provided with a lower threaded portion, and is in sealed connection with the overflow pipe 43 via the lower threaded portion.
[0044] Further, the fluid discharge pipe 41 and the overflow pipe 43 may be composed of a pipe body which sealedly passes through the impeller inner barrel 33, a portion of the pipe body located above the guide impeller barrel 3 constitutes the fluid discharge pipe 41, a portion of the pipe body located below the guide impeller barrel 3 constitutes the overflow pipe 43, and an inner cavity of the pipe body constitutes the backflow fluid through hole.
[0045] Further, as illustrated in Fig. 1, a radial inner side of each of the vanes 31 is connected to an outer wall of the impeller inner barrel 33, and a radial outer side of each of the vanes 31 is connected to an inner wall of the impeller outer barrel 32.
[0046] Further, as illustrated in Fig. 1, an outer wall of the impeller outer barrel 32 is fixedly connected to an inner wall of the diameter-constant straight hole 11 by threaded sealing.
[0047] Further, as illustrated in Fig. 1, the inner wall of the diameter-constant straight hole 11 located below the impeller outer barrel 32 is provided with a first step portion 14 having a top surface disposed to abut against a bottom surface of the impeller outer barrel 32. The first step portion 14 can axially support the guide impeller barrel 3 from the bottom portion to prevent the guide impeller barrel 3 from falling off under the downward impacting force of the drilling fluid.
[0048] Further, as illustrated in Fig. 1, an upper portion of a sidewall of the
2019202100 27 Mar 2019 diameter-constant straight hole 11 is provided with a first connection taper-thread portion 161, a bottom portion of an outer wall of the joint body 1 is provided with a diameter-decreasing downward tapered surface 15, and the tapered surface 15 is provided with a second connection taper-thread portion 162. The joint body 1 is stably connected to the drill stem in series via the first connection taper-thread portion 161 and the second connection taper-thread portion 162.
[0049] The use process of the drilling fluid density segmented regulation device 100 of the present invention is as follows:
[0050] the drilling fluid density segmented regulation device 100 of the present invention is connected to a drill stem 9 in series and is set into a well in accompany with the drill stem 9;
[0051] during the normal drilling process, no hollow sphere 2 is required to be added into the drilling fluid injected from the wellhead;
[0052] as illustrated in Fig. 2, when dual-gradient drilling is required, one drilling fluid density segmented regulation device 100 is connected to the drill stem 9 in series, the hollow spheres 2 of corresponding size are added into the drilling fluid injected from the wellhead, the drilling fluid and the hollow spheres 2 move downward to flow through an axial passage in the guide impeller barrel 3, the drilling fluid moving downward impacts each of the vanes, and each of the vanes disposed obliquely causes the drilling fluid and the injected hollow spheres to swirl downward; since the drilling fluid has a larger density than the hollow sphere 2, it is thrown to the inner wall of the joint body 1 under the centrifugal force and then moves downward along the inner wall of the joint body 1, while the hollow spheres 2 have a smaller density and are mostly concentrated at the middle of the central hole. After the hollow spheres 2 make a vortex motion and swirl downward into the tapered hole 12, the diameter of the tapered hole 12 is decreased downward, and the flow rate of the fluid is increased. When the hollow spheres 2 and the drilling fluid make vortex motions, an internal pressure of the joint body 1 is unevenly distributed in a radial direction, i.e., the internal pressure is increasingly lower as the distance to the center is decreased, and even a negative pressure area is formed at a central position, which causes the hollow spheres 2 to be moved and concentrated toward the vicinity of the center. Since the bottom portion of the tapered hole 12 is necked and the diameter of the bottom portion is small, the hollow spheres 2 cannot completely pass through the bottom portion. At that time, a bottom portion of the overflow pipe 43 is formed with a low-pressure area, toward which parts of the hollow spheres 2 move under the pressure difference to form an upward inner swirling flow, and parts of the hollow spheres 2 enter a borehole annulus 81 via the overflow pipe 43, the backflow fluid through hole, the fluid discharge pipe 41, the transition pipe 42 and the fluid discharge through-hole 13, thereby
2019202100 27 Mar 2019 reducing the drilling fluid density of the borehole annulus 81 located above the drilling fluid density segmented regulation device 100. At that time, the drilling fluid densities in the wellbore annulus 81 have two values by taking the drilling fluid density segmented regulation device 100 as a boundary, and the drilling fluid density above the boundary is less than the drilling fluid density below the boundary, so that the wellbore pressures on the upper and lower sides of the boundary can be regulated, thereby achieving the variable-gradient drilling (dual-gradient drilling) on the upper and lower sides of the drilling fluid density segmented regulation device 100.
[0053] When multi-gradient drilling is required to be performed, a plurality of drilling fluid density segmented regulation devices 100 are connected to the drill stem 9 in series from top to bottom at intervals, and various sizes of hollow spheres 2 should be added into the drilling fluid injected from the wellhead. As illustrated in Fig. 3, in a specific application example of the present invention, two drilling fluid density segmented regulation devices 100 are connected to the drill stem 9 in series, and two sizes of hollow spheres 2 should be added into the drilling fluid injected from the wellhead. When the drilling fluid containing the hollow spheres 2 passes by an upper first drilling fluid density segmented regulation device 100, parts of the hollow sphere 2 of corresponding size enter the borehole annulus 81 via the overflow pipe 43, the backflow fluid through hole, the fluid discharge pipe 41, the transition pipe 42 and the fluid discharge through-hole 13; the remaining hollow spheres 2 continues moving downward along with the drilling fluid, and when then pass by a lower second drilling fluid density segmented regulation device 100, parts of the hollow sphere 2 of corresponding size enter the borehole annulus 81 via the overflow pipe 43, the backflow fluid through hole, the fluid discharge pipe 41, the transition pipe 42 and the fluid discharge through-hole 13. Viewed from the cross-section of the entire borehole annulus 81, the distribution of the hollow spheres 2 is in three levels, wherein a first level is above the first drilling fluid density segmented regulation device 100, a second level is between the first drilling fluid density segmented regulation device 100 and the second drilling fluid density segmented regulation device 100, and a third level is below the second drilling fluid density segmented regulation device 100; a concentration of the hollow spheres 2 in the first level is larger than a concentration of the hollow spheres 2 in the second level, and the concentration of the hollow spheres 2 in the second level is larger than a concentration of the hollow spheres 2 in the third level, so that three drilling fluid densities are presented in the borehole annulus 81, wherein a drilling fluid density in the third level is larger than a drilling fluid density in the second level, and the drilling fluid density in the second level is larger than a drilling fluid density in the first level, thereby achieving multi-gradient drilling and solving the problem of narrow-density window in the
2019202100 27 Mar 2019 deep-water drilling.
[0054] As can be seen from the above description, the drilling fluid density segmented regulation device provided by the present invention has the following beneficial effects:
[0055] 1) the drilling fluid density segmented regulation device of the present invention can regulate densities of drilling fluids arriving at different depths of a wellbore annulus by injecting hollow spheres of corresponding sizes into the drilling fluid, thereby more flexibly and accurately controlling the wellbore pressure, and achieving the multi-gradient drilling to solve the problem of narrow-density window in the deep-water drilling;
[0056] 2) the drilling fluid density segmented regulation device of the present invention can well solve the problem that excessive layers of casings are set in a short single-gradient drilling, while benefiting the well control to reduce the probability of dangerous accidents;
[0057] 3) any large equipment is not required when the drilling fluid density segmented regulation device of the present invention is used for the wellbore pressure segmented control, which reduces the drilling cost; at the same time, with the increase of development depth, under the limited layers of casing, the problem that it is difficult to reach the target layer in the single-gradient and double-gradient drilling can be well solved.
[0058] Those described above are just exemplary embodiments of the present invention, rather than limitations to the scope of the present invention. Any equivalent change or modification made by a person skilled in the art without deviating from the conception and principle of the present invention shall fall within the protection scope of the present invention.
[0059] It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
[0060] In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
Claims (7)
- ClaimsThe claims defining the invention are as follows:1. A drilling fluid density segmented regulation device, comprising a barrel-shaped joint body and a plurality of hollow spheres having a density less than a drilling fluid density; the joint body is provided with a central hole penetrating axially, the central hole is composed of a diameter-constant straight hole and a diameter-decreasing downward tapered hole which are communicated with each other vertically, and a sidewall of the joint body located on a top portion of the diameter-constant straight hole is provided with a plurality of fluid discharge through-holes each having an inner diameter larger than a diameter of the hollow sphere;a guide impeller barrel is provided to sleeve an end of the diameter-constant straight hole close to the tapered hole, the guide impeller barrel is provided therein with a plurality of vanes which are disposed to be oblique axially and spaced apart from each other circumferentially, an axial passage is formed between the vanes adjacent to each other to allow the hollow spheres and the drilling fluid to move downward, and the guide impeller barrel is provided therein with a backflow fluid through hole penetrating axially to allow the hollow spheres and the drilling fluid to backflow upward; a top portion of the guide impeller barrel is fixedly provided with a fluid discharge pipe extending upward, an inner cavity of the fluid discharge pipe is disposed in sealed communication with a top portion of the backflow fluid through hole, and a top portion of the fluid discharge pipe is in sealed communication with each of the fluid discharge through-holes via a plurality of transition pipes which are provided to be spaced apart from each other circumferentially; a bottom portion of the guide impeller barrel is fixedly provided with an overflow pipe extending downward, an inner cavity of the overflow pipe is disposed in sealed communication with a bottom portion of the backflow fluid through hole, and a bottom opening of the overflow pipe is located in the tapered hole; an inner diameter of the fluid discharge pipe and an inner diameter of the overflow pipe are both larger than the diameter of the hollow sphere.
- 2. The drilling fluid density segmented regulation device according to claim 1, wherein the guide impeller barrel comprises an impeller outer barrel in which an impeller inner barrel is sleeved coaxially, and an inner cavity of the impeller inner barrel constitutes the backflow fluid through hole.
- 3. The drilling fluid density segmented regulation device according to claim 1, wherein the2019202100 27 Mar 2019 guide impeller barrel comprises an impeller outer barrel in which an impeller inner barrel is sleeved coaxially, the fluid discharge pipe and the overflow pipe are composed of a pipe body which sealedly passes through the impeller inner barrel, a portion of the pipe body located above the guide impeller barrel constitutes the fluid discharge pipe, a portion of the pipe body located below the guide impeller barrel constitutes the overflow pipe, and an inner cavity of the pipe body constitutes the backflow fluid through hole.
- 4. The drilling fluid density segmented regulation device according to claim 2 or 3, wherein a radial inner side of each of the vanes is connected to an outer wall of the impeller inner barrel, and a radial outer side of each of the vanes is connected to an inner wall of the impeller outer barrel.
- 5. The drilling fluid density segmented regulation device according to claim 2 or 3, wherein an outer wall of the impeller outer barrel is fixedly connected to an inner wall of the diameter-constant straight hole by threaded sealing.
- 6. The drilling fluid density segmented regulation device according to claim 5, wherein the inner wall of the diameter-constant straight hole located below the impeller outer barrel is provided with a first step portion having a top surface disposed to abut against a bottom surface of the impeller outer barrel.
- 7. The drilling fluid density segmented regulation device according to claim 1, wherein an upper portion of a sidewall of the diameter-constant straight hole is provided with a first connection taper-thread portion, a bottom portion of an outer wall of the joint body is provided with a diameter-decreasing downward tapered surface, and the tapered surface is provided with a second connection taper-thread portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810263287.5A CN108425649B (en) | 2018-03-28 | 2018-03-28 | Drilling fluid density is segmented regulation device |
| CN201810263287.5 | 2018-03-28 |
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| Publication Number | Publication Date |
|---|---|
| AU2019202100A1 true AU2019202100A1 (en) | 2019-10-17 |
| AU2019202100B2 AU2019202100B2 (en) | 2020-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2019202012A Withdrawn AU2019202012A1 (en) | 2018-03-28 | 2019-03-22 | Drilling fluid density segmented regulation device |
| AU2019202100A Active AU2019202100B2 (en) | 2018-03-28 | 2019-03-27 | Drilling fluid density segmented regulation device |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2019202012A Withdrawn AU2019202012A1 (en) | 2018-03-28 | 2019-03-22 | Drilling fluid density segmented regulation device |
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| CN (1) | CN108425649B (en) |
| AU (2) | AU2019202012A1 (en) |
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| CN110700776A (en) * | 2019-10-12 | 2020-01-17 | 西南石油大学 | Multi-gradient marine riser gas-filling-hollow ball-injecting well drilling method and device |
| 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 |
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| 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 |
| CN2468595Y (en) * | 2000-11-06 | 2002-01-02 | 梁刚 | Sprial flow centrifugal type solid/liquid separator |
| CA2643690A1 (en) * | 2006-03-06 | 2007-09-13 | Exxonmobil Upstream Research Company | Method and apparatus for managing variable density drilling mud |
| CN101070755B (en) * | 2006-11-24 | 2010-06-09 | 中国海洋石油总公司 | Pressure-control well-drilling device based two gradients |
| US20100155063A1 (en) * | 2008-12-23 | 2010-06-24 | Pdti Holdings, Llc | Particle Drilling System Having Equivalent Circulating Density |
| AU2014384861B2 (en) * | 2014-03-03 | 2016-12-08 | Halliburton Energy Services, Inc. | Viscosifier polymer for treatment of a subterranean formation |
| CN106053291B (en) * | 2016-06-24 | 2018-10-19 | 中国石油大学(华东) | It is a kind of it is instant measure air containing fluid degasification before and after density device |
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2018
- 2018-03-28 CN CN201810263287.5A patent/CN108425649B/en active Active
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| AU2019202012A1 (en) | 2019-10-17 |
| AU2019202100B2 (en) | 2020-07-09 |
| CN108425649B (en) | 2019-06-14 |
| CN108425649A (en) | 2018-08-21 |
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