CN108222865B - Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid - Google Patents
Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid Download PDFInfo
- Publication number
- CN108222865B CN108222865B CN201810007757.1A CN201810007757A CN108222865B CN 108222865 B CN108222865 B CN 108222865B CN 201810007757 A CN201810007757 A CN 201810007757A CN 108222865 B CN108222865 B CN 108222865B
- Authority
- CN
- China
- Prior art keywords
- seawater
- additive
- density
- base slurry
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 94
- 238000005553 drilling Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims description 8
- 239000002002 slurry Substances 0.000 claims abstract description 144
- 239000013535 sea water Substances 0.000 claims abstract description 139
- 239000000654 additive Substances 0.000 claims abstract description 126
- 230000000996 additive effect Effects 0.000 claims abstract description 117
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims description 48
- 238000004364 calculation method Methods 0.000 claims description 36
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004570 mortar (masonry) Substances 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000010008 shearing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
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
-
- 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
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention relates to a self-feedback three-phase system drilling fluid mixing system, which comprises: a mixer, a seawater pool, a base slurry pool and an additive pool; the seawater pool is connected with the mixer through a first pipeline, the base slurry pool is connected with the mixer through a second pipeline, and the additive pool is connected with the mixer through a third pipeline; wherein the seawater pool contains seawater and is used for providing seawater raw materials for the first pipeline; the base slurry tank is used for accommodating a base slurry tank and providing a base slurry raw material for the second pipeline; the additive pool contains additives and is used for providing additive raw materials for the third pipeline; seawater, base slurry and additives enter a mixer to be mixed and then enter a slurry pool or a slurry pump manifold through a density self-feedback module. The density self-feedback module added with the self-feedback drilling fluid mixing system can enable the density of mixed liquid to be more accurate, and can also calibrate the flow meter by comparing the detected density with the set or designed density, and can enable the system to realize the mixing of raw materials in various proportions under the condition of not controlling the power of the pump.
Description
Technical Field
The invention belongs to the technical field of drilling, and particularly relates to a self-feedback three-phase system drilling fluid mixing system and a method for mixing drilling fluid.
Background
The drilling fluid balance drilling is the mature drilling technology in the world at present, and the balance drilling technology utilizes the static pressure of the drilling fluid to balance the bottom pressure so as to ensure the normal operation of drilling. However, deep water surface layer drilling faces shallow geological disaster risks such as shallow flow and shallow gas, and drilling problems such as narrow pressure window caused by weak stratum:
1. the safety density window is narrow, the well structure design is difficult, and the casing cannot be lowered to a preset depth. In deep water drilling, seawater exerts much less overburden pressure than rock on land because seawater has a lower density than rock. Therefore, since the fracture pressure gradient of the deep sea formation is smaller than that of the land formation with the same well depth, the safety margin between the formation pressure gradient and the fracture pressure gradient is very small, the safety density window becomes narrower as the water depth increases, the design difficulty of the well structure becomes greater, and the casing cannot be lowered to the predetermined well depth.
2. Drilling is in high-pressure shallow laminar flow, and well control is difficult to effectively implement. Deep water seafloor often contains a large amount of high pressure shallow laminar flow, including shallow water flow and shallow gas flow. The kick of shallow water flow is represented by difficulty in drilling and casing well cementation, and can cause borehole collapse and even seabed settlement in severe cases and possibly cause oil well abandonment; when drilling and meeting shallow layer air current, because the stratum is more shallow, do not have lower surface casing usually, fail to install wellhead assembly, in case take place the kick of shallow layer air current, gas can a large amount of entering into the pit shaft annular space, reduces the annular space effective pressure. In this case, the annulus pressure cannot be timely controlled without the wellhead.
A special kill method is therefore needed to address this challenge. During the drilling operation, as long as the measurement while drilling device monitors that the underground stratum has abnormal high pressure, the required high-density drilling fluid can be pumped out by manually inputting a working instruction or automatically operating the working instruction without circulating and waiting for preparing the high-density drilling fluid, so that the dynamic drilling operation with operation and weighting is realized.
In the prior art, a self-feedback device is not provided, the mixed liquid which cannot meet the requirement cannot be detected and adjusted again, the long-time use of the system can cause the reading deviation of a flowmeter, further cause the deviation of the proportion of the base slurry, the seawater and the additive and the preset parameter or the design parameter, and finally cause the density of the mixed liquid which cannot meet the requirement and cause the well killing failure, which is very fatal in the implementation of the technology; in the prior art, no pumping pressure protection device is arranged, so that mixing of various mixing ratios cannot be realized, or the safety and reliability of a pump cannot be ensured.
The existing mixer has the problems of complex structure, large volume, difficult installation and the like. And the high-speed fluid sprayed out of the nozzle can generate inelastic collision in the cabin, particularly when the inlet flow of the two-phase fluid is close, the two-phase fluid collision can form radial flow and directly flows out of the mixer, the collision also causes the momentum loss of the high-speed fluid, the high-speed low-speed shearing of the fluid is an important factor of mixing, the momentum loss also influences the high efficiency of mixing, and the uniform mixing under various discharge capacities and mixing ratios cannot be ensured.
Disclosure of Invention
In order to solve the defects in the engineering problems and adjust the drilling fluid in real time, the invention provides a self-feedback drilling fluid mixing system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
self-feedback three-phase system drilling fluid mixing system includes: a mixer, a seawater pool, a base slurry pool and an additive pool; the seawater pool is connected with the mixer through a first pipeline, the base slurry pool is connected with the mixer through a second pipeline, and the additive pool is connected with the mixer through a third pipeline; wherein the seawater pool contains seawater and is used for providing seawater raw materials for the first pipeline; the base slurry tank is used for accommodating the base slurry tank and supplying a base slurry raw material to the second pipeline and destroying the net structure of the high-viscosity fluid; the additive pool contains additives and is used for providing additive raw materials for the third pipeline; seawater, base slurry and additives enter a mixer to be mixed and then enter a slurry pool or a slurry pump manifold through a density self-feedback module.
Compared with the prior art, the invention has the following beneficial effects:
1. the density self-feedback module of the self-feedback three-phase system drilling fluid mixing system is added, so that the density of the mixed liquid is more accurate, and the flowmeter can be calibrated by comparing the detected density with the set or designed density.
2. The overflow valve arranged between the pump and the flowmeter can lead the system to realize the mixing of raw materials with various proportions under the condition of not controlling the power of the pump. When the opening degree of the control valve is too small, the pump pressure is increased, the overflow valve is opened to enable the fluid to flow back to the pool, the mixing of the seawater and the base slurry in all proportions is realized, the working safety of the pump is protected, and the reliability of the whole system is improved.
3. The shearing pump is adopted in the basic slurry conveying pump, the mesh structure of high-viscosity fluid is broken, the two-phase fluid can be mixed with each other, and the mixing is more efficient.
4. The nozzle of the mixer of the self-feedback three-phase system drilling fluid mixing system is in a T shape with the cabin body, the two nozzles are opposite to each other, are perpendicular to the axial line of the cabin body and are positioned at the eccentric position where the nozzles are just staggered, the nozzles adopt a reducing torsion structure, the torsion angle is 15-25 degrees, the reducing can accelerate the increase of turbulence degree of fluid, the torsion enables the fluid to form a primary vortex and increase the shearing contact area, and the mixing is more facilitated; the nozzle is directly welded to the cabin body, and the nozzle is directly welded to the cabin body, so that the size of the mixer can be reduced, and the turbulence degree is reduced due to the fact that the high-speed fluid is inefficiently mixed with the similar fluid in the flow channel behind the nozzle after being ejected out of the nozzle and the flow speed is reduced; the nozzle eccentric design can avoid inelastic collision of two fluids of the right-handed T-shaped mixer in the mixer, reduce the momentum loss and the radial flow generated after collision, lead to the direct outflow of the fluid from the mixer, be more favorable for the direct shearing of the ejected high-speed fluid and the low-speed fluid in the cabin, and form a secondary vortex, increase the mixing time of the fluid in the mixer, and lead the fluid to be efficiently mixed, and the mixer is not influenced by factors such as the discharge capacity mixing ratio and the like.
5. The additive inlet adopts a shunting structure, so that the additive can be shunted to the wall of the mixer, the additive is converged into the seawater and the base slurry flowing out at high speed and is mixed in the vortex in the cabin, the additive is prevented from directly flowing through the center of the mixer, the mixing time is shortened, and the three phases are mixed more uniformly.
Drawings
FIG. 1 is a schematic structural diagram of a self-feedback three-phase system drilling fluid mixing system;
FIG. 2 is a schematic flow diagram of a self-feedback three-phase system drilling fluid mixing system;
FIG. 3 is a schematic cross-sectional view of a mixer;
FIG. 4 is a schematic right-view of the mixer;
FIG. 5 is a schematic view of a mixer nozzle;
FIG. 6 is a schematic cross-sectional view of a mixer nozzle;
FIG. 7 is a schematic cross-sectional view of a mixer additive inlet;
FIG. 8 is a schematic diagram showing the variation of density in the axial direction of the mixer;
FIG. 9 shows the average density and the mean square error of different mixing ratios at the outlet of the mixer;
FIG. 10 is a schematic diagram of the three-phase mixing density variation of the mixer;
in the figure: 1a, a seawater pool, 1b, a base slurry pool, 1c, an additive pool, 2a, a mortar pump, 2b, a shear pump, 2c, a centrifugal pump, 3a, a first overflow valve, 3b, a second overflow valve, 3c, a third overflow valve, 4a, a first flow meter, 4b, a second flow meter, 4c, a third flow meter, 5a, a first control valve, 5b, a second control valve, 5c, a third control valve, 6, a mixer, 7, a density self-feedback module, 8, an on-site control box, 9, a remote hydraulic parameter design calculation control module, a seawater nozzle 601a, a base slurry nozzle 601b, a cabin 602, a seawater inlet 603, a base slurry inlet 604, an additive inlet 605, a mixed liquid outlet 606 and a diversion structure 607.
Detailed Description
As shown in fig. 1, the self-feedback three-phase system drilling fluid mixing system comprises: a mixer 6, a seawater tank 1a, a base slurry tank 1b and an additive tank 1 c; the seawater pool 1a is connected with the mixer 6 through a first pipeline, the base slurry pool 1b is connected with the mixer 6 through a second pipeline, and the additive pool 1c is connected with the mixer 6 through a third pipeline; wherein the seawater pool 1a contains seawater for providing a seawater raw material to the first pipeline; the base slurry tank 1b accommodates a base slurry tank for supplying a base slurry raw material to the second pipeline and breaking the network structure of the high-viscosity fluid; the additive tank 1c contains an additive for supplying an additive raw material to the third pipeline; seawater, base slurry and additives enter a mixer 6 to be mixed and then enter a slurry pool or a slurry pump manifold through a density self-feedback module 7.
A mortar pump 2a, a first flow meter 4a and a first control valve 5a are sequentially arranged on the first pipeline from the seawater pool 1a to the mixer 6; an overflow return bypass is arranged between the mortar pump 2a and the first flowmeter 4a, the overflow return bypass is connected to the seawater pool 1a, and a first overflow valve 3a is arranged on the overflow return bypass; the mortar pump 2a pumps seawater and enters the first pipeline, the first flowmeter 4a measures seawater flow in the first pipeline, the first overflow valve 3a is opened when in work, and the seawater overflows back to the seawater pool 1 a.
A shear pump 2b, a second flow meter 4b and a second control valve 5b are sequentially arranged on the second pipeline from the basic slurry tank 1b to the mixer 6; an overflow return bypass is arranged between the shear pump 2b and the second flowmeter 4b, a second overflow valve 3b is arranged on the overflow return bypass, and the overflow return bypass is connected to the base slurry tank 1 b; the shear pump 2b pumps the base slurry to enter the second pipeline, the second flowmeter 4b measures the flow of the base slurry in the second pipeline, the second overflow valve 3b is opened when working, and the base slurry overflows back to the base slurry pool 1 b.
A centrifugal pump 2c, a third flow meter 4c and a third control valve 5c are sequentially arranged on the third pipeline from the additive tank 1c to the mixer 6; an overflow return bypass is arranged between the centrifugal pump 2c and the third flow meter 4c, the overflow return bypass is connected to the additive tank 1c, and a third overflow valve 3c is arranged on the overflow return bypass; the centrifugal pump 2c pumps the additive into a third pipeline, a third flow meter 4c measures the flow of the additive in the third pipeline, a third overflow valve 3c is opened when working, and the additive overflows back into an additive pool.
The first flowmeter 4a in the first pipeline, the second flowmeter 4b in the second pipeline and the third flowmeter 4c in the third pipeline are connected with the field control box 8 in a wired or wireless mode; a first control valve meter 5a in a first pipeline, a second flow meter 5b in a second pipeline and a third flow meter 5c in a third pipeline are connected with a field control box 8 in a wired or wireless mode; the density self-feedback module 7 is connected with the field control box 8 in a wired or wireless mode; the field control box 8 is connected with a remote hydraulic parameter design calculation control module 9 in a wired or wireless mode. A first flowmeter 4a in the first pipeline transmits a seawater flow signal to a field control box 8, and the field control box 8 transmits the seawater flow signal to a remote hydraulic parameter design calculation control module 9; the remote hydraulic parameter design calculation control module 9 transmits a control signal to the field control box 8, and the field control box 8 transmits the control signal to the first control valve 5a to adjust the flow of the seawater. The second flowmeter 4b in the second pipeline transmits a base slurry flow signal to the field control box 8, the field control box 8 transmits the base slurry flow signal to the remote hydraulic parameter design calculation control module 9, the remote hydraulic parameter design calculation control module 9 transmits a control signal to the field control box 8, and the field control box 8 transmits the control signal to the second control valve 5b to adjust the base slurry flow. A third flow meter 4c in the third pipeline transmits an additive flow signal to a field control box 8, and the field control box 8 transmits the additive flow signal to a remote hydraulic parameter design calculation control module 9; the remote hydraulic parameter design calculation control module 9 transmits a control signal to the field control box 8, and the field control box 8 transmits the control signal to the third control valve 5c to adjust the additive flow. The density self-feedback module 7 transmits the density signal of the outlet of the mixer to the field control box 8, and the field control box 8 transmits the density signal to the remote hydraulic parameter design calculation control module 9.
The field control box 8 can read the flow rates of the seawater, the base slurry and the additive and the density of the mixed liquid at the outlet of the mixer, and can manually adjust the opening of the control valve. The remote hydraulic parameter design and calculation module 9 can manually input a command of required drilling fluid density, and can also calculate the required drilling fluid density according to the formation pressure and calculate the required discharge capacity of seawater, base slurry and additives according to the drilling fluid density.
As shown in fig. 1 and 2, the remote hydraulic parameter designing and calculating module 9 may manually input a command of a required drilling fluid density, or design and calculate the drilling fluid density by using the remote hydraulic parameter designing and calculating module 9 according to the formation pressure, design the proportion and the required displacement of the base slurry, the seawater and the additive, merge the base slurry and the additive into the mixer 6 by the first manifold and the second manifold, adjust the opening of the first control valve 5a to adjust the seawater flow rate according to the calculated data, adjust the opening of the second control valve 5b to adjust the base slurry flow rate, and adjust the opening of the third control valve 5c to adjust the additive flow rate. The first flow meter 4a transmits the seawater flow, the second flow meter 4b transmits the base slurry flow and the third flow meter 4c transmits the additive flow data to the control module 9 to compare with the design parameters, and the opening of the control valve is further adjusted until the seawater, the base slurry and the additive reach the calculated displacement. When the mixing ratio of the seawater is small, the opening degree of the first control valve 5a is small, the pump pressure is increased, the first overflow valve 3a is opened, and the seawater flows back to the seawater pool 1 a; when the base slurry mixing ratio is small, the opening degree of the second control valve 5b is small, the pump pressure is increased, the second overflow valve 3b is opened, and the base slurry flows back to the base slurry tank 1 b; when the mixing ratio of the additive is small, the opening degree of the third control valve 5c is small, the pump pressure is increased, the third overflow valve 3c is opened, and the additive flows back to the additive tank 1c, so that the mixing of the seawater, the base slurry and the additive in various proportions and discharge capacities is realized; the density self-feedback module 7 transmits a density signal of the outlet of the mixer to the field control box 8, the field control box 8 transmits the density signal to the remote hydraulic parameter design calculation control module 9 to be compared with an instruction or a designed density, the discharge capacity of seawater, base slurry and an additive is recalculated when the expected value is not reached, a closed loop is formed until the density meets the requirement, the field drilling requirement is met, and the error of the flowmeter can be found in time according to the density feedback value to be corrected.
It can be understood that when no additive is needed, the additive inlet 12 in the third pipeline can be closed, the proportion of the base slurry and the seawater and the required discharge capacity are designed, the seawater and the base slurry are converged into the mixer 6 through the first manifold, the opening of the first control valve 5a is adjusted according to the calculated data to adjust the flow of the seawater, and the opening of the second control valve 5b is adjusted to adjust the flow of the base slurry. The first flowmeter 4a transmits the seawater flow and the second flowmeter 4b transmits the base slurry flow data to the control module 9 to be compared with design parameters, and the opening of the control valve is further adjusted until the seawater and the base slurry reach the calculated displacement. When the mixing ratio of the seawater is small, the opening degree of the first control valve 5a is small, the pump pressure is increased, the first overflow valve 3a is opened, and the seawater flows back to the seawater pool 1 a; when the base slurry mixing ratio is small, the opening degree of the second control valve 5b is small, the pump pressure is increased, the second overflow valve 3b is opened, and the base slurry flows back into the base slurry tank 1b, so that the mixing of the seawater and the base slurry in various proportions and discharge capacities is realized; the density self-feedback module 7 transmits a density signal of the outlet of the mixer to the field control box 8, the field control box 8 transmits the density signal to the remote hydraulic parameter design calculation control module 9 to be compared with an instruction or a designed density, the discharge capacity of seawater, base slurry and an additive is recalculated when the expected value is not reached, a closed loop is formed until the density meets the requirement, the field drilling requirement is met, and the error of the flowmeter can be found in time according to the density feedback value to be corrected.
As shown in fig. 3, the mixer 6 includes: a cabin 602, a seawater inlet 603, a base slurry inlet 604, an additive inlet 605 and a mixed liquid outlet 606; the additive inlet 605 and the mixed liquid outlet 606 are respectively connected with two ends of the cabin 602, and the seawater inlet 603 and the base slurry inlet 604 are positioned at one end of the cabin 602 close to the additive 605 inlet and are respectively divided at two sides of the cabin 602; a seawater nozzle 601a is arranged between the cabin 602 and the seawater inlet 603, a base slurry nozzle 601b is arranged between the cabin 602 and the base slurry inlet 603, and a flow dividing structure 607 is arranged between the cabin 602 and the additive inlet 605; as shown in fig. 4, the seawater nozzle 601a and the base slurry nozzle 601b are both arranged opposite to the cabin body in an eccentric manner, and the optimal eccentric distance is the distance when no intersection part exists on the projection of the vertical mixing cabin; seawater inlet 603, base slurry inlet 604 and additive inlet 605 are used for mixing seawater, base slurry and additives which are gathered into the cabin body through a nozzle; wherein the additive inlet 605 can be closed when the additive is not needed, so as to complete the mixing of the base slurry and the seawater; the mixed liquor is discharged through outlet 606.
As shown in fig. 5, the seawater nozzle 601a and the base slurry nozzle 601b have the same structure and are both dumbbell-shaped, the dumbbell-shaped can increase the shearing area, and the nozzle shape belongs to the prior art; as shown in fig. 6, inlets of the seawater nozzle 601a and the base slurry nozzle 601b adopt a dumbbell-shaped twisting reducing structure, the twisting angle is 15-25 degrees, the reducing structure accelerates the fluid to increase the turbulence, the twisting can increase the shearing area, and primary vortex is formed; the shortest thickness of the seawater nozzle 601a and the base slurry nozzle 601b is 8-10cm, so that high-speed fluid and vortex can be formed, and the size can be smaller; the seawater nozzle 601a and the base slurry nozzle 601b are directly connected with the cabin body, so that an inefficient mixing area at an outlet is saved, the turbulence degree of high-speed fluid is ensured, and the structure is more compact; the eccentric structure enables the two fluids to form secondary vortex in the mixer, and the vortex is beneficial to increasing the contact time and the contact area of the two components in the cabin; the structure is beneficial to the movement of two components in the mutual occupied space in a volume diffusion mode, the fluid is subjected to the actions of shearing, extruding, stretching and the like to achieve uniform distribution, the inelastic collision of the high-speed fluid in the cabin is avoided, the high-speed fluid is directly sheared and mixed with the low-speed fluid in the cabin, the momentum loss is reduced, the mixing time of the fluid in the mixer is prolonged, the two fluids are mixed more efficiently, and the requirements of various discharge capacities and mixing ratios can be met. The invention has more compact structure, does not affect the installation mode (horizontal and vertical), saves the space of the ocean platform, can make the installation more convenient and saves the installation time.
As shown in fig. 7, the additive entry adopts reposition of redundant personnel structure 607, the inside round platform shape that is of reposition of redundant personnel structure 607, it is the hemisphere to be close to additive entry position, the outside is empty round platform shape, outside small head is connected with the additive entry, the major part is connected with the mixing cabin, the inside 4 rectangular blocks that link together with the outside of reposition of redundant personnel structure, the reposition of redundant personnel structure can shunt the additive to blender wall department, make the additive converge into high-speed outflow's sea water and base stock, mix in the inboard swirl, avoid the additive directly to flow through from the blender center and reduce the mix time, it is more even to make the three-phase mix.
As shown in fig. 1 and 2, the method for mixing drilling fluid by using the self-feedback three-phase system drilling fluid mixing system comprises the following steps:
1. the hydraulic parameter design calculation control module 9 obtains a required drilling fluid density instruction, or the hydraulic parameter design and calculation module 9 is used for designing and calculating the drilling fluid density according to the formation pressure, and the proportion and the required discharge capacity of seawater, base slurry and an additive are designed;
the hydraulic parameter design calculation control module 9 of the drilling fluid mixing system calculates the mud density and the discharge capacity required by killing the well according to the formation pressure according to the principle that: under the density and the discharge capacity, the pressure of a flowing circulating frictional resistance liquid adding column in the well is equal to the pore pressure of the stratum but less than the fracture pressure of the stratum; according to the conditions of offshore drilling, the density of the well killing fluid meets the following requirements:
Pr≤Pwf＝ρmgh+Pfr+ρswghsw
in the formula:
Pr-formation pressure, Pa;
Pwf-bottom hole pressure, Pa;
ρm-density of drilling fluid in kg/m after mixing3；
h-depth of mud line from bottom hole, m;
Pfr-annulus friction, Pa;
ρswsea water density, kg/m3；
hsw-water depth, m;
the annular friction resistance is calculated by the following formula:
in the formula:
Dwi-section i wellbore diameter, m;
Dp-drill rod outer diameter, cm;
dc-drill collar outside diameter, cm;
ρm-density of drilling fluid in kg/m after mixing3；
Mu-slurry plastic viscosity, Pa · s;
q-displacement, L/s;
Hi-an ith wellbore length;
b is constant, the inner flat drill rod B is 0.51655, and the through hole drill rod B is 0.57503;
the maximum final mud density is calculated from the formation fracture pressure:
in the formula:
h-depth of mud line from bottom hole, m;
ρswsea water density, kg/m3；
hsw-water depth, m;
ρ′mend slurry Density, kg/m3；
Pf-formation fracture pressure, MPa;
control of the dynamic kill volume is required while adjusting the drilling mud density. The discharge capacity of drilling fluid required for realizing well killing is as follows:
in the formula:
Pr-formation pressure, Pa;
ρswsea water density, kg/m3；
ρm-density of drilling fluid in kg/m after mixing3；
hsw-water depth, m;
h-depth of mud line from bottom hole, m;
mu-slurry plastic viscosity, Pa · s;
Dwi-section i wellbore diameter, m;
Dp-drill rod outer diameter, cm;
Dc-drill collar outer diameter, cm;
hi-an ith wellbore length;
b is constant, the inner flat drill rod B is 0.51655, and the through hole drill rod B is 0.57503;
the maximum drilling displacement for ensuring the safety of the shaft is as follows:
the discharge capacity of the drilling fluid also meets the requirement of carrying rocks, and the minimum discharge capacity required for meeting the requirement of carrying rocks is as follows:
in the formula:
Qa-minimum displacement, L/s, to meet the requirement for carrying rock.
Dw-wellbore diameter, cm;
Dp-drill rod outer diameter, cm;
ρm-density of drilling fluid in kg/m after mixing3；
The displacement of weighted drilling fluid and seawater can be calculated by the following formula:
ρm(Q1+Q2+Q3)＝ρ0Q1+ρswQ2+ρtjQ3
Q＝Q1+Q2+Q3
Q2＝aQ3
in the formula:
a is the required preset ratio of seawater to additive, and has no dimension;
ρ0base slurry density of weighted drilling fluid in kg/m3；
ρtjDensity of additive, kg/m3；
Q1In order to increase the discharge capacity of the base slurry of the drilling fluid, L/s;
Q2the discharge capacity of seawater is L/s;
Q3is the additive displacement, L/s;
2. adjusting the seawater flow controlled by a first control valve, the base slurry flow controlled by a second control valve and the additive flow controlled by a third control valve according to the displacement and proportion data calculated by the remote hydraulic parameter design and calculation module 9;
3. when the required flow of the seawater is small, the opening degree of the first control valve 5a is reduced, the pump pressure of the mortar pump 2a is increased, the first overflow valve 3a is opened to release the pressure, and the seawater flows back to the seawater pool 1 a; when the required flow of the base slurry is small, the opening degree of the second control valve 5b is reduced, the pump pressure of the shear pump 2b is increased, the second overflow valve 3b is opened to release the pressure, and the base slurry flows back to the base slurry tank 1 b; when the required flow of the additive is small, the opening degree of a third control valve 5c is reduced, the pump pressure of a centrifugal pump 2c is increased, a third overflow valve 3c is opened to release pressure, and the additive flows back to an additive tank 1 c;
4. the first flow meter 4a transmits the seawater flow, the second flow meter 4b transmits the base slurry flow and the third flow meter 4c transmits the additive flow data to the control module 9 to compare with the design parameters, and the opening of the control valve is further adjusted until the seawater, the base slurry and the additive reach the calculated displacement;
5. the seawater passes through a first control valve 5a, the base slurry passes through a second control valve 5b and the additive passes through a third control valve 5c and then is mixed in a mixer;
6. the mixer outlet density self-feedback module 7 feeds the measured density back to the control module to be compared with the instruction or the designed density, the opening of the control valve is adjusted again when the measured density cannot reach the expected value, a closed loop is formed until the density meets the requirement, the field drilling requirement is met, and the error of the flowmeter can be found in time according to the density feedback value and corrected.
Experiment and simulation verification: as shown in FIG. 8, the density of the base slurry was 2.0g/cm3Sea water density 1.025g/cm3And the density change chart on the mixer axis is obtained after the base slurry and the seawater are mixed by the mixer under the condition of 3:2 mixing ratio under different discharge capacities. And the well killing requirement is met according to the equivalent density of the drilling fluid and the annular circulation friction resistance during well killing. The circulation friction is closely related to the discharge capacity, so the mixer must be capable of meeting the requirement of mixing drilling fluids with different discharge capacities. Especially, when the large displacement is needed in an emergency, the reliability of the mixer is tested. From fig. 8, the mixer can rapidly mix the base slurry and the seawater uniformly and stably in the mixer under the discharge capacity of 20L/s-100L/s. As shown in fig. 9: under the condition that the discharge capacity is 50L/s and under the condition of different mixing ratios of the basic slurry and the seawater, the density after theoretical mixing and the mixing density and the mean square error of a simulation experiment show that the error between the outlet density of the mixer and a theoretical value is small and stable, and the field requirement can be met. As shown in fig. 10: and (3) uniformly taking x, x1, x2, x3 and x4 as a mixing effect diagram when the seawater is 30L/s, the base slurry is 20L/s and the additive is 5L/s, respectively representing different axial linear density change curves in the mixer, wherein the length of the mixer is 0.5m, and the density at a mixing outlet is uniformly mixed.
Claims (2)
1. A self-feedback three-phase system drilling fluid mixing system, comprising: the seawater pool is connected with the mixer through a first pipeline, the base slurry pool is connected with the mixer through a second pipeline, the additive pool is connected with the mixer through a third pipeline, and the seawater pool provides seawater raw materials for the first pipeline; the base slurry tank provides a base slurry raw material for the second pipeline and destroys the net structure of the high-viscosity fluid; the additive pool provides additive raw materials for the third pipeline; seawater, base slurry and additives enter a mixer to be mixed and then enter a slurry pool or a slurry pump manifold through a density self-feedback module; the method is characterized in that:
a mortar pump, a first flowmeter and a first control valve are sequentially arranged on the first pipeline from the seawater pool to the mixer; an overflow return bypass is arranged between the mortar pump and the first flowmeter and connected to the seawater pool, and a first overflow valve is arranged on the overflow return bypass; the mortar pump pumps seawater to enter a first pipeline, a first flowmeter measures seawater flow in the first pipeline, a first overflow valve is opened when working, and the seawater overflows back to the seawater pool;
a shear pump, a second flowmeter and a second control valve are sequentially arranged on the second pipeline from the basic slurry tank to the mixer; an overflow return bypass is arranged between the shear pump and the second flowmeter, a second overflow valve is arranged on the overflow return bypass, and the overflow return bypass is connected to the base slurry tank; the shear pump pumps the base slurry into the second pipeline, the second flowmeter measures the flow of the base slurry in the second pipeline, the second overflow valve is opened when working, and the base slurry overflows back into the base slurry pool;
a centrifugal pump, a third flow meter and a third control valve are sequentially arranged on the third pipeline from the additive tank to the mixer; an overflow return bypass is arranged between the centrifugal pump and the third flowmeter and connected to the additive tank, and a third overflow valve is arranged on the overflow return bypass; the centrifugal pump pumps the additive into a third pipeline, the third flowmeter measures the flow of the additive in the third pipeline, a third overflow valve is opened when working, and the additive overflows back into the additive tank;
the first flow meter in the first pipeline, the second flow meter in the second pipeline and the third flow meter in the third pipeline are connected with the field control box in a wired or wireless mode; a first control valve in the first pipeline, a second control valve in the second pipeline and a third control valve in the third pipeline are connected with the field control box in a wired or wireless mode; the density self-feedback module is connected with the field control box in a wired or wireless mode; the field control box is connected with the remote hydraulic parameter design calculation control module in a wired or wireless mode; a first flowmeter in the first pipeline transmits a seawater flow signal to a field control box, and the field control box transmits the seawater flow signal to a remote hydraulic parameter design calculation control module; the remote hydraulic parameter design calculation control module transmits a control signal to the field control box, and the field control box transmits the control signal to the first control valve to control and adjust the flow of the seawater; a second flowmeter in the second pipeline transmits a base slurry flow signal to a field control box, the field control box transmits the base slurry flow signal to a remote hydraulic parameter design calculation control module, the remote hydraulic parameter design calculation control module transmits a control signal to the field control box, and the field control box transmits the control signal to a second control valve to control and adjust the base slurry flow; a third flow meter in the third pipeline transmits an additive flow signal to the field control box, and the field control box transmits the additive flow signal to the remote hydraulic parameter design calculation control module; the remote hydraulic parameter design calculation control module transmits a control signal to the field control box, and the field control box transmits the control signal to a third control valve to control and adjust the flow of the additive; the density self-feedback module transmits a density signal of the outlet of the mixer to the field control box, and the field control box transmits the density signal to the remote hydraulic parameter design calculation control module;
the field control box can read the flow rates of the seawater, the base slurry and the additive and the density of the mixed liquid at the outlet of the mixer, and can manually adjust the opening of the control valve; the remote hydraulic parameter design and calculation module can manually input a required drilling fluid density instruction, can also calculate the required drilling fluid density according to the formation pressure, and calculates the required discharge capacity of seawater, base slurry and additives according to the drilling fluid density; the remote hydraulic parameter design and calculation module can manually input a required drilling fluid density instruction, or design and calculate the drilling fluid density by utilizing the remote hydraulic parameter design and calculation module according to the formation pressure, design the proportion and the required discharge capacity of the base slurry, seawater and an additive, converge the base slurry and the additive into the mixer through the first manifold, the second manifold and the third manifold, adjust the opening of the first control valve according to the calculation data to adjust the flow of the seawater, adjust the opening of the second control valve to adjust the flow of the base slurry and adjust the opening of the third control valve to adjust the flow of the additive; the first flow meter transmits the seawater flow, the second flow meter transmits the base slurry flow and the third flow meter transmits the additive flow data to the remote hydraulic parameter design calculation control module to be compared with design parameters, and the opening of the control valve is further adjusted until the seawater, the base slurry and the additive reach the calculated discharge capacity; when the mixing ratio of the seawater is small, the opening degree of the first control valve is small, the pump pressure is increased, the first overflow valve is opened, and the seawater flows back to the seawater pool; when the base slurry mixing ratio is small, the opening degree of a second control valve is small, the pump pressure is increased, a second overflow valve is opened, and the base slurry flows back to the base slurry pool; when the mixing ratio of the additive is small, the opening degree of a third control valve is small, the pump pressure is increased, a third overflow valve is opened, and the additive flows back to the additive tank, so that the mixing of the seawater, the base slurry and the additive in various proportions and discharge capacities is realized; the density self-feedback module transmits a density signal of an outlet of the mixer to the field control box, the field control box transmits the density signal to the remote hydraulic parameter design calculation control module to be compared with an instruction or a designed density, the expected value cannot be reached, the discharge capacity of seawater, base slurry and an additive is recalculated, a closed loop is formed until the density meets the requirement, the field drilling requirement is met, and the error of the flowmeter can be found in time according to the density feedback value to be corrected;
a mixer, comprising: the device comprises a cabin body, a seawater inlet, a base slurry inlet, an additive inlet and a mixed liquid outlet; the additive inlet and the mixed liquid outlet are respectively connected with two ends of the cabin body, and the seawater inlet and the base slurry inlet are positioned at one end of the cabin body close to the additive inlet and are respectively separated from two sides of the cabin body; a seawater nozzle is arranged between the cabin body and the seawater inlet, a base slurry nozzle is arranged between the cabin body and the base slurry inlet, and a shunt structure is arranged between the cabin body and the additive inlet; the seawater nozzle and the base slurry nozzle are arranged opposite to the cabin body in an eccentric manner, and the eccentric distance is the distance between the seawater nozzle and the base slurry nozzle when no intersection part exists on the projection of the seawater nozzle and the base slurry nozzle in the vertical mixing cabin; seawater, base slurry and an additive are converged into the cabin body through a nozzle and mixed through a seawater inlet, a base slurry inlet and an additive inlet; wherein, when the additive is not needed, the additive inlet can be closed to complete the mixing of the base slurry and the seawater; discharging the mixed liquid through an outlet;
the seawater nozzle and the base slurry nozzle have the same structure and are dumbbell-shaped; inlets of the seawater nozzle and the base slurry nozzle adopt a dumbbell-shaped twisting reducing structure, and the twisting angle is 15-25 degrees;
the additive entry adopts the reposition of redundant personnel structure, the inside round platform shape that is of reposition of redundant personnel structure, it is the hemisphere to be close to additive entry position, the outside is empty round platform shape, outside stub and additive entry linkage, the cabin body coupling of stub and blender, the inside and outside four rectangular blocks that are used of reposition of redundant personnel structure link together, the reposition of redundant personnel structure can be shunted additive to blender wall department, make the additive converge high-speed outflow's sea water and base paste, mix in the swirl in the cabin, avoid the additive to directly flow through from the blender center and reduce the mix time, it is more even to make the three-phase mix.
2. The method for mixing drilling fluid by using the self-feedback three-phase system drilling fluid mixing system as claimed in claim 1, wherein the method comprises the following steps:
(1) the remote hydraulic parameter design calculation control module obtains a required drilling fluid density instruction, or the remote hydraulic parameter design and calculation module is used for designing and calculating the drilling fluid density according to the formation pressure, and the proportion and the required discharge capacity of seawater, base slurry and an additive are designed;
a remote hydraulic parameter design calculation control module of a drilling fluid mixing system calculates the density and the discharge capacity of mud required by well killing according to the formation pressure according to the principle that: under the density and the discharge capacity, the pressure of a flowing circulating frictional resistance liquid adding column in the well is equal to the pore pressure of the stratum but less than the fracture pressure of the stratum; according to the conditions of offshore drilling, the density of the well killing fluid meets the following requirements:
Pr≤Pwf＝ρmgh+Pfr+ρswghsw
in the formula:
Pr-formation pressure, Pa;
Pwf-bottom hole pressure, Pa;
ρm-density of drilling fluid in kg/m after mixing3；
h-depth of mud line from bottom hole, m;
Pfr-annulus friction, Pa;
ρswsea water density, kg/m3；
hsw-water depth, m;
the annular friction resistance is calculated by the following formula:
in the formula:
Dwi-section i wellbore diameter, m;
Dp-drill rod outer diameter, cm;
dc-drill collar outside diameter, cm;
ρm-density of drilling fluid in kg/m after mixing3；
Mu-slurry plastic viscosity, Pa · s;
q-displacement, L/s;
Hi-an ith wellbore length;
b is constant, the inner flat drill rod B is 0.51655, and the through hole drill rod B is 0.57503;
the maximum final mud density is calculated from the formation fracture pressure:
in the formula:
h-depth of mud line from bottom hole, m;
ρswsea water density, kg/m3；
hsw-water depth, m;
ρ′mend slurry Density, kg/m3；
Pf-formation fracture pressure, MPa;
the dynamic kill discharge volume needs to be controlled while the drilling mud density is adjusted; the discharge capacity of drilling fluid required for realizing well killing is as follows:
in the formula:
Pr-formation pressure, Pa;
ρswsea water density, kg/m3；
ρm-density of drilling fluid in kg/m after mixing3；
hsw-water depth, m;
h-depth of mud line from bottom hole, m;
mu-slurry plastic viscosity, Pa · s;
Dwi-section i wellbore diameter, m;
Dp-drill rod outer diameter, cm;
Dc-drill collar outer diameter, cm;
hi-an ith wellbore length;
b is constant, the inner flat drill rod B is 0.51655, and the through hole drill rod B is 0.57503;
the maximum drilling displacement for ensuring the safety of the shaft is as follows:
the discharge capacity of the drilling fluid also meets the requirement of carrying rocks, and the minimum discharge capacity required for meeting the requirement of carrying rocks is as follows:
in the formula:
Qa-minimum displacement, L/s, to meet the requirement for carrying rock;
Dw-wellbore diameter, cm;
Dp-drill rod outer diameter, cm;
ρm-density of drilling fluid in kg/m after mixing3；
The displacement of weighted drilling fluid and seawater can be calculated by the following formula:
ρm(Q1+Q2+Q3)＝ρ0Q1+ρswQ2+ρtjQ3
Q＝Q1+Q2+Q3
Q2＝aQ3
in the formula:
a is the required preset ratio of seawater to additive, and has no dimension;
ρ0in order to increase the density of the base slurry of the drilling fluid in kg/m3；
ρtjIs additive density, kg/m3；
Q1In order to increase the discharge capacity of the base slurry of the drilling fluid, L/s;
Q2the discharge capacity of seawater is L/s;
Q3is the additive displacement, L/s;
(2) adjusting the seawater flow controlled by a first control valve, the base slurry flow controlled by a second control valve and the additive flow controlled by a third control valve according to the displacement and proportion data calculated by the remote hydraulic parameter design calculation control module;
(3) when the required flow of the seawater is small, the opening degree of the first control valve is reduced, the pump pressure of the mortar pump is increased, the first overflow valve is opened to release the pressure, and the seawater flows back to the seawater pool; when the required flow of the base slurry is small, the opening degree of a second control valve is reduced, the pump pressure of the shear pump is increased, a second overflow valve is opened to release pressure, and the base slurry flows back to the base slurry pool; when the required flow of the additive is small, the opening degree of a third control valve is reduced, the pumping pressure of the centrifugal pump is increased, a third overflow valve is opened to release pressure, and the additive flows back to the additive tank;
(4) the first flow meter transmits the seawater flow, the second flow meter transmits the base slurry flow and the third flow meter transmits the additive flow data to the remote hydraulic parameter design calculation control module to be compared with design parameters, and the opening of the control valve is further adjusted until the flows of the seawater, the base slurry and the additive reach the calculated discharge capacity;
(5) the seawater passes through the first control valve, the base slurry passes through the second control valve and the additive passes through the third control valve and then is mixed in the mixer;
(6) the mixer outlet density self-feedback module feeds the measured density back to the remote hydraulic parameter design calculation control module to be compared with the instruction or the designed density, the opening of the control valve is adjusted again when the measured density cannot reach the expected value, a closed loop is formed until the density meets the requirement, the field drilling requirement is met, and the error of the flowmeter can be found in time according to the density feedback value to be corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007757.1A CN108222865B (en) | 2018-01-04 | 2018-01-04 | Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810007757.1A CN108222865B (en) | 2018-01-04 | 2018-01-04 | Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108222865A CN108222865A (en) | 2018-06-29 |
| CN108222865B true CN108222865B (en) | 2021-02-26 |
Family
ID=62642892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810007757.1A Active CN108222865B (en) | 2018-01-04 | 2018-01-04 | Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108222865B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112417778A (en) * | 2020-11-18 | 2021-02-26 | 中国石油大学(华东) | Pressure control well cementation method and system based on deep shaft cement slurry system simulation |
| CN112577711B (en) * | 2020-11-27 | 2022-10-11 | 中国核动力研究设计院 | Parallel channel flow instability behavior characteristic test device and method |
| CN114082316A (en) * | 2022-01-21 | 2022-02-25 | 东营市百扬石油科技有限责任公司 | Fracturing fluid on-site blending device adopting novel emulsion type thickening agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797451A (en) * | 2012-08-29 | 2012-11-28 | 中国海洋石油总公司 | Automatic control system and method for underground annulus pressure of deep water surface layer drilling |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2240580C (en) * | 1998-06-12 | 2001-01-16 | Roman Anthony Bilak | Apparatus and method for subterranean injection of slurried wastes |
| AU762491C (en) * | 1998-10-14 | 2005-02-17 | Tracto-Technik Paul Schmidt Spezialmaschinen | Mixing system |
| CN102029120B (en) * | 2010-11-16 | 2013-04-03 | 中国海洋石油总公司 | Mixing device for regulating density of drilling liquid |
| CN103894083B (en) * | 2014-04-02 | 2016-04-13 | 重庆科技学院 | A kind of dumb-bell shape nozzle drilling fluid mixed adjusting device |
-
2018
- 2018-01-04 CN CN201810007757.1A patent/CN108222865B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797451A (en) * | 2012-08-29 | 2012-11-28 | 中国海洋石油总公司 | Automatic control system and method for underground annulus pressure of deep water surface layer drilling |
Non-Patent Citations (2)
| Title |
|---|
| ZM-2钻井液密度调节混合装置的研制与应用;雷宗明等;《天然气工业》;20141130;第34卷(第11期);第82-87页 * |
| 撞击流混合器微观混合性能的研究;李友凤等;《高校化学工程学报》;20120229;参见正文第2节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108222865A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108222865B (en) | Self-feedback three-phase system drilling fluid mixing system and method for mixing drilling fluid | |
| RU2341654C2 (en) | Method and system of fluid medium recirculation in borehole system | |
| US9175530B2 (en) | Wellbore fluid mixing system | |
| US20110272158A1 (en) | High pressure manifold trailer and methods and systems employing the same | |
| US9695654B2 (en) | Wellhead flowback control system and method | |
| US20050006089A1 (en) | Low cost method and apparatus for fracturing a subterranean formation with a sand suspension | |
| US6739408B2 (en) | Apparatus and method for preparing variable density drilling muds | |
| US20090120635A1 (en) | Apparatus and Method for Maintaining Boost Pressure to High-Pressure Pumps During Wellbore Servicing Operations | |
| CN105909228B (en) | High voltage pulse hydraulic slotted liner technique-fracturing device and method | |
| CN1206441C (en) | Reverse cycle drilling method and equipment for oil well or gas well | |
| CA2805703A1 (en) | Real-time field friction reduction meter and method of use | |
| AU2002229044A1 (en) | Apparatus and method for preparing variable density drilling muds | |
| CN108119074A (en) | Self feed back two-phase system drilling fluid mixed system and the method for mixing drilling fluid | |
| US20200061553A1 (en) | Method of in-line wellbore fluid blending | |
| CN106120797B (en) | Hydrous fluids continuous steel frame aqueduct pier foundation grouting construction method | |
| CN107387035A (en) | Gas injection High Pressure Drain system in a kind of well | |
| AU2015392941B2 (en) | Bead suspension mixing with cement slurry | |
| CN111254923B (en) | Micro-disturbance foundation reinforcing device and underground tunnel enclosure construction method | |
| CN103894083B (en) | A kind of dumb-bell shape nozzle drilling fluid mixed adjusting device | |
| CN205955715U (en) | Pulsed high voltage water conservancy slot fracturing device | |
| CN108176264B (en) | Multiphase system drilling fluid mixer | |
| CN104632110A (en) | Continuous circulation drilling process suitable for gas-liquid two-phase flow drilling | |
| CN101397894B (en) | Well drilling gas injection joint and use method thereof | |
| US11401759B2 (en) | Horizontal directional drilling system and method of operating | |
| Mokhalalati et al. | Aerated mud drilling experience in Abu Dhabi |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |