CN107654203B - Steady flow bearing device for drilling fluid pressure difference type density sensor - Google Patents
Steady flow bearing device for drilling fluid pressure difference type density sensor Download PDFInfo
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- CN107654203B CN107654203B CN201710898176.7A CN201710898176A CN107654203B CN 107654203 B CN107654203 B CN 107654203B CN 201710898176 A CN201710898176 A CN 201710898176A CN 107654203 B CN107654203 B CN 107654203B
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- 238000005553 drilling Methods 0.000 title claims abstract description 73
- 239000012530 fluid Substances 0.000 title claims abstract description 68
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- 239000012528 membrane Substances 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims description 3
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- 238000001739 density measurement Methods 0.000 abstract description 15
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
Abstract
The invention provides a steady-flow bearing device of a drilling fluid differential pressure type density sensor, which belongs to the technical field of oil and gas exploration, and structurally comprises a sensor support rod and a sensor pressure membrane, wherein the sensor pressure membrane is arranged on the rod body of the sensor support rod, and a spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure membrane is positioned; the spherical cover is formed by buckling a head-on hemispherical cover and a back-flow hemispherical cover, and the sensor support rod penetrates through the spherical shell in the longitudinal axis direction; the windward reversing curved wing and the back reversing curved wing form a drooping drop opening at the bottom end; the sensor support rod extends downwards from the drop opening to penetrate out; the nasal alar holes are uniformly formed on one third of the concentrated area of the spherical crown surface of the back flow surface hemispherical cover, and the nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction. The density measurement error is eliminated, accurate density data is provided for establishing a safe drilling fluid system, and the invention is beneficial to the safety of drilling construction; truly reflecting the drilling fluid density.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration, in particular to a steady flow bearing device of a drilling fluid differential pressure type density sensor.
Background
Drilling fluid refers to a fluid medium used in the drilling process. Drilling fluids are called mud. The drilling fluid may be a liquid or a gas, and therefore, the drilling fluid should be referred to exactly as a drilling fluid. During drilling, the circulating flushing medium used in the hole is also called drilling flushing fluid. The drilling fluid can be divided into clear water, slurry, clay-free phase flushing fluid, emulsion, foam, compressed air and the like according to the components. Clear water is the earliest drilling fluid used, does not need to be treated, is convenient to use, and is suitable for the areas with complete rock stratum and sufficient water sources. The mud is a widely used drilling fluid, and is mainly suitable for rock formations with unstable hole wall, such as loose, crack development, easy collapse and block falling, water swelling and peeling, and the like. The drilling fluid has the main functions of: (1) cleaning the bottom of the well, carrying rock debris; (2) cooling and lubricating the drill bit and drill string; (3) balancing the side pressure of the well wall rock; (4) balancing (controlling) formation pressure; (5) suspending cuttings and weighting agents; (6) sand and rock debris can be removed by sinking on the ground; (7) efficiently delivering hydraulic power; (8) bear part of the weight of the drill pipe and casing; (9) providing a plurality of data of the formation being drilled; (10) hydraulically breaking the rock. In order to improve the capacity of drilling fluid for carrying rock debris, stabilize the well wall and prevent complex situations, the density of the conventional drilling fluid is higher than 1g/cm < 3 >. Under complex drilling conditions, such as kick, blowout, lost circulation and the like, the density of drilling fluid needs to be detected at any time, and in an exploration site, the drilling fluid density detection device is a density sensor.
In exploration, drilling fluids are complex systems that contain formation fluids (oil, gas, water), solid particles of cuttings after breaking up the drill bit, and other additives. The drilling fluid density detected by the sensor is a pure liquid density, but the actual density value measurement is often influenced by the interference of other substances, and the drilling fluid density value is a very important parameter in well control work, so how to accurately detect the drilling fluid density while drilling is an important function of comprehensive logging.
In the exploration site, two measurement modes of drilling fluid density are basically available, one is an off-line mechanical densimeter (mud scale), the other is an on-line continuous differential pressure density sensor, and the differential pressure density sensor is used for comprehensively logging the drilling fluid density. The static density of the drilling fluid is measured by a non-online mechanical densimeter (mud scale), and the drilling fluid is intermittent in time; the dynamic density of the drilling fluid measured by the online continuous differential pressure density sensor is free from time interruption, and is a continuous measurement mode while drilling. The differential pressure type density sensor is composed of two pressure diaphragms arranged at a certain vertical interval, and the differential pressure of the upper diaphragm and the lower diaphragm is used for calculating the density of drilling fluid. However, due to the existence of solid phase particles and oil-gas-water with different densities in the drilling fluid, the pressure difference is often not measured accurately, so that measurement errors exist between an off-line mechanical densimeter (mud scale) and an on-line continuous differential pressure density sensor, and the existence of the measurement errors directly affects the problems in aspects of drilling safety, complex condition treatment and the like, and the fundamental reason is that the dynamic solid phase particles generate additional interference on a pressure diaphragm. In order to prevent the interference, a hole disc is usually arranged on the periphery of the pressure membrane, and the hole disc is used for blocking solid-phase particles from bearing on the pressure membrane, but the problem is not solved in practical application, so that the normalization of density measurement errors exists, and the working quality and the exploration benefit are directly influenced. In summary, problems with drilling fluid density measurements and the resultant non-positive effects are mainly:
(1) The density measurement error can cause that a safe drilling fluid system cannot be established, which is not beneficial to the safety of drilling construction;
(2) The density of the drilling fluid cannot be truly reflected, so that the waste of the drilling fluid configuration materials is caused, and the exploration cost is increased;
(3) Inaccurate density measurement can not accurately establish a bottom hole pressure system, and the balance relation between bottom hole pressure and bottom hole pressure is difficult to maintain;
(4) Inaccurate density measurement is not beneficial to carrying drill cuttings at the bottom of a well, well flushing is not thorough, and underground accidents are easy to occur;
(5) After a complex accident occurs, no accurate density reference is easy to cause errors in decision making of processing problems, and the exploration benefit is directly influenced;
(6) In order to maintain accurate density measurement, operators need to clean and maintain the density sensor with clean water frequently, so that the labor intensity is increased, professional health protection is not facilitated, and water resources are wasted;
(7) The method is not beneficial to the exertion of the working function of the comprehensive logging in oil and gas exploration, and reduces the working quality.
In short, the density measurement of drilling fluid must be accurate and timely, and only then can ensure safe and high-quality exploration construction, and the key to solve the problem is to have a device capable of eliminating errors in the measurement of drilling fluid density.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a steady flow bearing device of a drilling fluid differential pressure type density sensor.
The technical proposal of the invention is realized in the following way that the steady flow bearing device of the drilling fluid differential pressure type density sensor structurally comprises a sensor support rod and a sensor pressure diaphragm, wherein the sensor pressure diaphragm is arranged on the rod body of the sensor support rod,
a spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure diaphragm is positioned;
the spherical cover is formed by buckling a head-on hemispherical cover and a back-flow hemispherical cover,
the convex spherical crown of the head-on hemispherical shield faces the left side of the sensor support rod,
the convex spherical crown of the back flow surface hemispherical shield faces the right side of the sensor support rod,
the head-on hemispherical cover and the back-flow hemispherical cover are arranged opposite to the horizontal transverse shaft, the edges of the opposite hemispherical covers are connected in a sealing way to form a spherical shell-shaped structure, and the sensor strut section containing the sensor pressure membrane is enclosed in the spherical shell cavity;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the head-on hemispherical cover takes the near bottom end as an inflection point to be provided with a head-on reverse curved wing with reverse curvature, and the head-on reverse curved wing bends towards the left head-on surface and is restrained in a downward inclined manner;
the bottom end of the back flow surface hemispherical cover takes the near bottom end as an inflection point to be provided with a back flow reversing curved wing with reverse bending curvature, and the back flow reversing curved wing bends and ends towards the right back flow surface obliquely downwards;
the bottom inflection point of the head-on hemispherical cover and the bottom inflection point of the back-flow hemispherical cover are positioned at the same horizontal position;
the downward expansion height of the counter-flow reversing curved wing is larger than that of the back-flow reversing curved wing;
the windward reversing curved wing and the back reversing curved wing form a drooping drop opening at the bottom end;
the sensor support rod extends downwards from the drop opening to penetrate out;
the area of one third of the concentrated spherical crown surface of the back flow surface hemispherical cover is uniformly provided with nasal alar holes, nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction, the covered spherical crown surface of the nasal alar Kong Lvwang faces the sensor pressure membrane, the nasal alar of the nasal alar holes is formed by the back flow surface hemispherical cover which is turned out towards the periphery, and a hole channel is formed between the nasal alar turned-out surface and the nasal alar holes;
the top end of a spherical shell formed by the head-on hemispherical cover and the back-flow hemispherical cover is fixedly arranged on the sensor support rod through a flange lock catch, a spherical shell cavity is communicated with the outside below through a drooping drop port in an open mode, and the spherical shell cavity is communicated with the outside on one side of the back-flow surface through a nose wing hole filter screen.
The drop mouth is arranged in a bevel horn mouth shape.
The hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
The steady flow bearing device of the drilling fluid differential pressure type density sensor, which is close to the above, structurally comprises a sensor support rod and a sensor pressure diaphragm, wherein the sensor pressure diaphragm is arranged on the rod body of the sensor support rod,
an integrated integral spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure diaphragm is positioned;
the left half part of the integrated integral spherical cover is a head-on surface, the right half part of the integrated integral spherical cover is a back-flow surface hemispherical cover,
the convex spherical crown of the head-on flow surface faces the left side of the sensor strut,
the convex spherical crown of the back flow surface faces the right side of the sensor strut,
the head-on surface and the back-flow surface enclose a sensor strut section containing a sensor pressure diaphragm in a spherical shell cavity at the inner periphery of the spherical cover;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the spherical shell of the integral spherical cover is outwards expanded at the near-pole everting curved surface to form a drooping drop port;
the sensor support rod extends downwards from the drop opening to penetrate out;
the area of one third of the concentrated spherical crown surface of the back flow surface is uniformly provided with nasal alar holes, nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction, the covered spherical crown surface of the nasal alar Kong Lvwang faces the sensor pressure membrane, the nasal alar of the nasal alar holes is formed by the hemispherical cover of the back flow surface being turned out towards the periphery, and a hole channel is formed between the nasal alar turned-out surface and the nasal alar holes;
the spherical shell top end formed by the head-on flow surface and the back flow surface is fixedly arranged on the sensor support rod through a flange lock catch, the spherical shell cavity is communicated with the outside below through a drooping drop port in an open mode, and the spherical shell cavity is communicated with the outside on one side of the back flow surface through a nose wing hole filter screen.
The drop mouth is arranged in a bevel horn mouth shape.
The hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
Compared with the prior art, the invention has the following beneficial effects:
the steady flow bearing device of the drilling fluid differential pressure type density sensor has the following performances and advantages:
(1) The density measurement error is eliminated, accurate density data is provided for establishing a safe drilling fluid system, and the drilling construction safety is facilitated;
(2) The density of the drilling fluid is truly reflected, the application of the drilling fluid preparation materials is saved, and the exploration cost is reduced;
(3) The density measurement is reliable, a bottom hole pressure system can be accurately established, and the balance relation between bottom hole pressure and bottom hole pressure is maintained;
(4) The density measurement is accurate, so that the drilling fluid can carry the rock debris at the bottom of the well, the well is washed thoroughly, and the occurrence probability of underground accidents is reduced;
(5) Accurate drilling fluid density measurement is beneficial to decision making of complex problem processing, and exploration benefits are improved;
(6) The density measurement is accurate, operators do not need to clean and maintain the density sensor with clear water, the labor intensity is reduced, the occupational health protection is facilitated, and the water resource is saved;
(7) The comprehensive logging device is beneficial to the exertion of the working function of the comprehensive logging in oil and gas exploration, and ensures the working quality.
The steady flow bearing device of the drilling fluid differential pressure type density sensor fully improves accuracy of drilling fluid density measurement in field practical application, is beneficial to safety and high efficiency of oil and gas resource exploration, reduces labor intensity of operators, and is beneficial to professional health protection. Meanwhile, the working quality is ensured, and the environment protection is also facilitated.
The steady-flow bearing device of the drilling fluid differential pressure type density sensor can be widely applied to comprehensive logging construction in petroleum and natural gas exploration, and can be applied to other working fields requiring fluid density measurement. The device is an important device for ensuring accurate detection of the density of drilling fluid, is indispensable equipment for comprehensive logging construction, and is beneficial to safety and high efficiency of oil and gas exploration.
The steady flow bearing device of the drilling fluid differential pressure type density sensor is scientific and reasonable in design, simple and convenient to assemble and operate, free of special maintenance, simple in structure, safe, reliable and convenient to use, and has good popularization and use values.
Drawings
FIG. 1 is a schematic view of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
The reference numerals in the drawings denote:
1. a sensor support rod 2 and a sensor pressure diaphragm,
3. a ball cover, 4, a head-on flow surface semi-ball cover, 5, a back flow surface semi-ball cover,
6. a windward reversing curved wing, 7, a back-flow reversing curved wing,
8. a drop opening is formed on the lower part of the upper part of the lower part,
9. nasal alar hole, 10, nasal alar Kong Lvwang, 11, nasal alar, 12, hole channel,
13. and (4) flange lock catches, 14 and a cover flange.
Detailed Description
The steady flow bearing device of the drilling fluid differential pressure type density sensor is described in detail below with reference to the accompanying drawings.
Embodiment one:
as shown in the attached drawing, the steady flow bearing device of the drilling fluid differential pressure type density sensor of the invention structurally comprises a sensor support rod 1 and a sensor pressure membrane 2, wherein the sensor pressure membrane 2 is arranged on the rod body of the sensor support rod 1, the sensor pressure membrane 2 is fixedly connected on the rod body of the sensor support rod 1 through a bracket,
the periphery of the sensor support rod 1 where the sensor pressure diaphragm 2 is positioned is provided with a spherical cover 3;
the spherical cover 3 is formed by buckling a head-on flow surface hemispherical cover 4 and a back flow surface hemispherical cover 5 through a cover surface flange 14,
the convex spherical crown of the head-on hemispherical cap 4 faces the left side of the sensor strut 1,
the convex spherical crown of the back flow surface hemispherical cap 5 faces the right side of the sensor strut 1,
the head-on hemispherical cover 4 and the back-flow hemispherical cover 5 are arranged opposite to the horizontal transverse shaft, and the edges of the opposite hemispherical covers are connected in a sealing way to form a spherical shell structure, and the sensor strut section containing the sensor pressure membrane is enclosed in the spherical shell cavity;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the head-on hemispherical cover 4 takes the near bottom end as an inflection point to be provided with a head-on reverse curved wing 6 with reverse curvature, and the head-on reverse curved wing bends towards the left head-on surface and is restrained in a downward inclined direction;
the bottom end of the back flow surface hemispherical cover 5 takes the near bottom end as an inflection point to be provided with a back flow reversing curved wing 7 with reverse bending curvature, and the back flow reversing curved wing bends and ends towards the right back flow surface obliquely downwards;
the bottom inflection point of the head-on hemispherical cover and the bottom inflection point of the back-flow hemispherical cover are positioned at the same horizontal position;
the downward expansion height of the counter-flow reversing curved wing is larger than that of the back-flow reversing curved wing;
the windward reversing curved wing and the back reversing curved wing form a drooping drop port 8 at the bottom end;
the sensor support rod 1 extends downwards from the drop opening 8 to penetrate out;
the nose wing holes 9 are uniformly formed in the area of one third of the concentrated spherical crown surface of the back flow surface hemispherical cover, the nose wing Kong Lvwang is formed towards the consistent nose wing holes, the covered spherical crown surface of the nose wing Kong Lvwang faces the sensor pressure membrane, the nose wings 11 of the nose wing holes are formed by turning out the back flow surface hemispherical cover towards the periphery, and a hole channel 12 is formed between the nose wing turning-out surface and the nose wing holes;
the top end of a spherical shell formed by the head-on hemispherical cover and the back-flow hemispherical cover is fixedly arranged on the sensor support rod through a flange lock catch 13, a spherical shell cavity is communicated with the outside below through a drooping drop port in an open mode, and the spherical shell cavity is communicated with the outside on one side of the back-flow surface through a nose wing hole filter screen.
The drop mouth is arranged in a bevel horn mouth shape.
The hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
Embodiment two:
the steady flow bearing device of the drilling fluid differential pressure type density sensor structurally comprises a sensor support rod and a sensor pressure diaphragm, wherein the sensor pressure diaphragm is arranged on the rod body of the sensor support rod, the sensor pressure diaphragm 2 is fixedly connected on the rod body of the sensor support rod 1 through a bracket,
an integrated integral spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure diaphragm is positioned;
the left half part of the integrated integral spherical cover is a head-on surface, the right half part of the integrated integral spherical cover is a back-flow surface hemispherical cover,
the convex spherical crown of the head-on flow surface faces the left side of the sensor strut,
the convex spherical crown of the back flow surface faces the right side of the sensor strut,
the head-on surface and the back-flow surface enclose a sensor strut section containing a sensor pressure diaphragm in a spherical shell cavity at the inner periphery of the spherical cover;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the spherical shell of the integral spherical cover is outwards expanded at the near-pole everting curved surface to form a bellmouth-shaped drooping falling opening;
the sensor support rod extends downwards from the drop opening to penetrate out;
the area of one third of the concentrated spherical crown surface of the back flow surface is uniformly provided with nasal alar holes, nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction, the covered spherical crown surface of the nasal alar Kong Lvwang faces the sensor pressure membrane, the nasal alar of the nasal alar holes is formed by the hemispherical cover of the back flow surface being turned out towards the periphery, and a hole channel is formed between the nasal alar turned-out surface and the nasal alar holes;
the spherical shell top end formed by the head-on flow surface and the back flow surface is fixedly arranged on the sensor support rod through a flange lock catch, the spherical shell cavity is communicated with the outside below through a drooping drop port in an open mode, and the spherical shell cavity is communicated with the outside on one side of the back flow surface through a nose wing hole filter screen.
The drop mouth is arranged in a bevel horn mouth shape.
The hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
The steady flow bearing device of the drilling fluid differential pressure type density sensor serving as the steady flow filtering device is a hemisphere, is buckled on the sensor rod body, and is made of high-quality stainless steel as a whole.
(1) A hemisphere. The diameter of the sphere is 130mm and the wall thickness is 1.4mm. The hemispheroids are two independent hemispheroids and are butted on the sensor support rod through the lock catch. One of the hemispheres is closed, an airfoil opening is arranged below the closed hemispheroid, the opening is opened according to a certain angle of the lower part of the hemispheroid and the tangential direction, the opening is downward and outward in an arc span, and the span length is 50mm (long wing). The 1/3 area of the sphere of the middle lower part on the other half sphere of the hemisphere is designed into a filter screen structure, the filter screen is a nasal wing hole, the aperture is 3mm, the whole nasal wing hole filter screen surface is obliquely downwards arranged at an angle of 15 degrees with the horizontal plane, the lower part of the sphere is provided with an opening, the opening is opened according to a tangential direction at a certain angle of the lower part of the sphere, the downward and outward arc-shaped wing spreading is realized, and the wing spreading length is 30mm (short wing). The arc distance at the narrowest part of the arc openings of the two long wings and the short wings of the hemisphere is 40mm, the arc distance at the widest part is 50mm, and the two wings are asymmetric.
(2) When the drilling fluid passes through the closed hemispheroids in the horizontal direction at a certain flow rate, the cambered surface drainage effect of the spheres provides movement acceleration for solid-phase particles in the drilling fluid, so that the retention time of the solid-phase particles is reduced; when the drilling fluid flows obliquely upwards at a certain flow speed, the arc-shaped structure of the long wing can escape solid-phase particles to the periphery, so that the probability of the solid-phase particles entering the hemispheres is reduced.
(3) The hemispheroids with the alar holes are used for entering drilling fluid, and the alar holes obliquely downwards can fully utilize the characteristic that solid phase particles have large specific gravity and naturally drop down, so that the probability of entering the spheres by the solid phase particles is reduced. When the drilling fluid flows obliquely upwards at a certain flow speed, the arc-shaped structures of the short wings can escape solid-phase particles to the periphery, so that the probability of the solid-phase particles entering the hemispheres is reduced.
(4) In a real drill, the device is adjusted to enable drilling fluid to flow from left to right, solid-phase particles move along the tangential direction of a spherical surface under the action of a closed spherical surface, and solid-phase particles are not easy to gather at a filter screen under the action of a flowing trend. The space formed by the cambered surfaces of the long wings and the short wings can generate potential energy for the solid-phase particles to move to the periphery of the lower part, and is also unfavorable for the aggregation of the solid-phase particles. The solid phase particles entering the hemispheroids also drop downwards under the action of self gravity, flow out of the hemispheroids through holes formed by the long wings and the short wings, and can not stay on the hemispheroids to press the pressure membrane of the sensor. Meanwhile, due to the asymmetric design of the long wings and the short wings, potential energy of flowing drilling fluid from left to right is fully utilized, and the possibility of solid-phase particle retention is reduced to the greatest extent.
Claims (2)
1. Drilling fluid differential pressure type density sensor stationary flow load-carrying device, including sensor branch and sensor pressure diaphragm, sensor pressure diaphragm disposes on the pole body of sensor branch, its characterized in that:
a spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure diaphragm is positioned;
the spherical cover is formed by buckling a head-on hemispherical cover and a back-flow hemispherical cover,
the convex spherical crown of the head-on hemispherical shield faces the left side of the sensor support rod,
the convex spherical crown of the back flow surface hemispherical shield faces the right side of the sensor support rod,
the head-on hemispherical cover and the back-flow hemispherical cover are arranged opposite to the horizontal transverse shaft, the edges of the opposite hemispherical covers are connected in a sealing way to form a spherical shell-shaped structure, and the sensor strut section containing the sensor pressure membrane is enclosed in the spherical shell cavity;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the head-on hemispherical cover takes the near bottom end as an inflection point to be provided with a head-on reverse curved wing with reverse curvature, and the head-on reverse curved wing bends towards the left head-on surface and is restrained in a downward inclined manner;
the bottom end of the back flow surface hemispherical cover takes the near bottom end as an inflection point to be provided with a back flow reversing curved wing with reverse bending curvature, and the back flow reversing curved wing bends and ends towards the right back flow surface obliquely downwards;
the bottom inflection point of the head-on hemispherical cover and the bottom inflection point of the back-flow hemispherical cover are positioned at the same horizontal position;
the downward expansion height of the counter-flow reversing curved wing is larger than that of the back-flow reversing curved wing;
the windward reversing curved wing and the back reversing curved wing form a drooping drop opening at the bottom end;
the sensor support rod extends downwards from the drop opening to penetrate out;
the area of one third of the concentrated spherical crown surface of the back flow surface hemispherical cover is uniformly provided with nasal alar holes, nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction, the covered spherical crown surface of the nasal alar Kong Lvwang faces the sensor pressure membrane, the nasal alar of the nasal alar holes is formed by the back flow surface hemispherical cover which is turned out towards the periphery, and a hole channel is formed between the nasal alar turned-out surface and the nasal alar holes;
the top end of a spherical shell formed by the head-on hemispherical cover and the back-flow hemispherical cover is fixedly arranged on the sensor support rod through a flange lock catch, a spherical shell cavity is communicated with the outside below through a drop opening in an open manner, and the spherical shell cavity is communicated with the outside on one side of the back-flow surface through a nose wing hole filter screen;
wherein:
the drop mouth is arranged in a bevel horn shape;
the hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
2. Drilling fluid differential pressure type density sensor stationary flow load-carrying device, including sensor branch and sensor pressure diaphragm, sensor pressure diaphragm disposes on the pole body of sensor branch, its characterized in that:
an integrated integral spherical cover is arranged on the periphery of the sensor support rod where the sensor pressure diaphragm is positioned;
the left half part of the integrated integral spherical cover is a head-on surface, the right half part of the integrated integral spherical cover is a back-flow surface hemispherical cover,
the convex spherical crown of the head-on flow surface faces the left side of the sensor strut,
the convex spherical crown of the back flow surface faces the right side of the sensor strut,
the head-on surface and the back-flow surface enclose a sensor strut section containing a sensor pressure diaphragm in a spherical shell cavity at the inner periphery of the spherical cover;
the sensor support rod penetrates through the spherical shell in the longitudinal axis direction;
the bottom end of the spherical shell of the integral spherical cover is outwards expanded at the near-pole everting curved surface to form a drooping drop port;
the sensor support rod extends downwards from the drop opening to penetrate out;
the area of one third of the concentrated spherical crown surface of the back flow surface is uniformly provided with nasal alar holes, nasal alar Kong Lvwang is formed by the nasal alar holes facing the same direction, the covered spherical crown surface of the nasal alar Kong Lvwang faces the sensor pressure membrane, the nasal alar of the nasal alar holes is formed by the hemispherical cover of the back flow surface being turned out towards the periphery, and a hole channel is formed between the nasal alar turned-out surface and the nasal alar holes;
the top end of a spherical shell formed by the head-on flow surface and the back flow surface is fixedly arranged on the sensor support rod through a flange lock catch, a spherical shell cavity is in open communication with the outside below through a drooping drop port, and the spherical shell cavity is in communication with the outside on one side of the back flow surface through a nose wing hole filter screen;
wherein:
the drop mouth is arranged in a bevel horn shape;
the hole channel of the nasal wing hole is provided with an outward inclined downward direction along the diameter direction of the back flow surface hemispherical cover from the inner cavity of the back flow surface hemispherical cover to the outside.
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| CN110439534B (en) * | 2019-08-06 | 2022-05-06 | 中国石油集团川庆钻探工程有限公司 | Seismic data well leakage prediction method |
| CN111335872B (en) * | 2020-03-20 | 2023-06-09 | 天津欣海石油工程技术有限公司 | Drilling fluid density sensor for petroleum engineering |
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