US20150053400A1 - Apparatus and method for mixing fluids - Google Patents
Apparatus and method for mixing fluids Download PDFInfo
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- US20150053400A1 US20150053400A1 US14/465,503 US201414465503A US2015053400A1 US 20150053400 A1 US20150053400 A1 US 20150053400A1 US 201414465503 A US201414465503 A US 201414465503A US 2015053400 A1 US2015053400 A1 US 2015053400A1
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- fluid
- chamber
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- opening
- formation
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- 239000012530 fluid Substances 0.000 title claims abstract description 229
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000015572 biosynthetic process Effects 0.000 claims description 45
- 239000000376 reactant Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000013626 chemical specie Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012545 processing 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
Definitions
- This disclosure relates to mixing fluids and, more particularly, to an apparatus for mixing fluids.
- Mixing devices can be used to mix two different types of fluids together downhole within a wellbore tool. More specifically, a mixing device can be used to create a mixture between a reactant and a formation fluid.
- the reactant can be used to detect a particular chemical within the formation fluid.
- the reactant is a fluid that is selected to detect hydrogen sulfide (H 2 S) within the formation fluid by reacting with the hydrogen sulfide and producing a detectable optical characteristic.
- the mixing device can be used to generate a mixture by thoroughly mixing the reactant with the formation fluid. This mixture can then be analyzed optically to determine the presence of a particular chemical within the formation fluid. To facilitate this optical analysis, often the mixing device generates a homogenous mixture between the reactant and the formation fluid.
- Illustrative embodiments of the present disclosure are directed to a wellbore tool for mixing a first fluid with a second fluid.
- the wellbore tool includes a chamber with a first end, a second end, a first opening at the first end, and a second opening at the second end.
- the tool also includes a piston positioned within the chamber.
- the piston generates a seal between the first end and the second end of the chamber and is movable along the chamber towards the first end and towards the second end of the chamber.
- the tool further includes a restrictor positioned at the first end of the chamber. The restrictor allows the flow of fluid through the first opening and into the chamber and partially restricts flow of fluid through the first opening and out the chamber.
- the tool also includes a perforated piston positioned within the chamber between the piston and the second end of the chamber.
- the perforated piston includes a bottom surface, a top surface, and one or more channels that allow fluid to flow between the top surface and the bottom surface of the perforated piston.
- Various embodiments of the present disclosure are also directed to a downhole method for mixing a first fluid with a second fluid within a chamber.
- the chamber includes a piston, a perforated piston, a first end with a first opening, and a second end with a second opening.
- the method includes:
- FIG. 1 shows a mixing apparatus in accordance with one embodiment of the present disclosure
- FIGS. 2A and 2B show a restrictor in accordance with one embodiment of the present disclosure
- FIGS. 3A-3E show a method for mixing fluids in accordance with one embodiment of the present disclosure
- FIG. 4 shows a wireline logging system at a well site in accordance with one embodiment of the present disclosure
- FIG. 5 shows a wireline tool in accordance with one embodiment of the present disclosure.
- FIG. 6 shows the wireline tool of FIG. 5 in more detail.
- Illustrative embodiments of the present disclosure are directed to an apparatus for mixing a first fluid with a second fluid.
- the second fluid can be a formation fluid that includes a gas, a liquid, or both.
- the first fluid can be a reactant fluid that reacts when mixed with the formation fluid to detect presence of a particular chemical species within the formation fluid (e.g., hydrogen sulfide (H2S), carbon dioxide (CO2), and mercury (Hg)).
- H2S hydrogen sulfide
- CO2 carbon dioxide
- Hg mercury
- the mixing apparatus described herein includes a restrictor that protects components of the mixing apparatus during operation. Details of various embodiments are described below.
- FIG. 1 shows an example of a mixing apparatus 100 for mixing a first fluid with a second fluid.
- the mixing apparatus 100 includes a chamber 102 with a first end 104 , a second end 106 , an opening 108 at the first end, and a second opening 110 at the second end.
- the apparatus 100 also includes a piston 112 positioned within the chamber. The piston 112 generates a seal between the first end 104 and the second end 106 of the chamber and is movable along the chamber towards the first end and towards the second end of the chamber.
- the apparatus 100 further includes a restrictor 114 positioned at the first end of the chamber. The restrictor 114 allows the flow of fluid through the first opening 108 and into the chamber 102 and partially restricts flow of fluid through the first opening and out the chamber.
- the apparatus also includes a perforated piston 118 positioned within the chamber 102 between the piston 112 and the second end 106 of the chamber.
- the perforated piston 118 includes a bottom surface, a top surface, and one or more channels that allow fluid to flow between the top surface and the bottom surface of the perforated piston.
- the perforated piston 118 is affixed to walls of the chamber and is stationary. In other embodiments, the perforated piston 118 is movable along the chamber 102 towards the first end and towards the second end of the chamber.
- the mixing apparatus 100 also includes a fluid delivery system for providing fluids to the chamber.
- the fluid delivery system include a valve 120 in fluid communication with the second opening 110 and a pump 122 in fluid communication with the first opening 108 .
- the fluid delivery system moves the piston 112 towards the first end 104 of the chamber 102 and thus supplies a volume of the second fluid to the chamber through the second opening.
- the first fluid is pre-loaded within the chamber 102 .
- the fluid delivery system first introduces the first fluid into the chamber 102 and then introduces the second fluid.
- the fluid delivery system also moves the piston 112 towards the perforated piston 118 and the second end 106 of the chamber to inject at least a portion of the first fluid through the one or more channels of the perforated piston 118 and into the second fluid.
- Movement of the piston 112 can be accomplished by using the pump 122 to introduce a third fluid (e.g., water) into the first end 104 of the chamber.
- the third fluid is used to hydraulically push on the piston 112 and move the piston towards the perforated piston 118 and the second end 106 of the chamber.
- the piston 112 can move back towards the first end 104 of the chamber by removing the third fluid from the chamber 102 through the restrictor 114 .
- the third fluid can be removed using the pump 122 or by opening a valve (not shown) that creates a pressure difference between the first end of the chamber 104 and the second end of the chamber 106 . For this reason, the first end 104 of the chamber can be referred to as the “hydraulic end.”
- FIGS. 2A and 2B show the restrictor 114 in more detail.
- the restrictor 114 allows flow of fluid in a first direction (into the chamber 102 ) while partially restricting flow of fluid in an opposite direction (out of the chamber), as compared to the first direction.
- the restrictor 114 can also be referred to as a “restrictor piston” because the restrictor can be part of a piston that is positioned at the first end 104 of the chamber.
- the restrictor 114 includes two passage ways.
- a first passage way 202 includes a small hole that provides a flow path of high resistance from the chamber 102 to first opening 108 .
- a second passage way 204 includes a constriction within the passage way.
- a ball with a diameter that is larger than the constriction is positioned within the passage way 204 .
- This configuration can be referred to as a “ball check valve” configuration.
- Other check valves can also be used within the second passage way 204 .
- diaphragm check valves, swing check valves, lift-check valves, in-line check valves, or duckbill valves can also be used.
- the second passage way 204 When in an open position, the second passage way 204 provides for greater fluid flow than the first passage way 202 .
- FIGS. 2A and 2B show the two states of fluid flow through the restrictor 114 .
- the ball lodges within the constriction and prevents the flow of fluid through the second passage way 204 .
- the first high resistance passage way 202 remains open and the third fluid flows through the first passage way.
- the restrictor 114 allows the flow of fluid into the chamber 102 , while partially restricting flow of fluid out the chamber.
- the restrictor 114 and the first opening 108 are separate components.
- the third fluid first flows through the restrictor and then through the first opening 108 , or vice versa.
- the restrictor 114 and the first opening 108 are the same components.
- the one or more passageways within the restrictor 114 are the first opening 108 .
- FIGS. 3A-3E show a method for mixing a first fluid with a second fluid using the mixing apparatus 100 shown in FIG. 1 .
- the pump 122 draws the piston 112 down towards the first end 104 of the chamber and, thereby, pulls the second fluid 300 into the chamber 112 .
- the first fluid (e.g., reactant) 302 is pre-loaded within the chamber 102 and there is no need for the pump to introduce the first fluid into the chamber.
- the pump 122 can be used to introduce the first fluid into the chamber 102 and then introduce the second fluid. Once the second fluid has been introduced, in some embodiments, the valve 120 is closed.
- the pump 122 pushes up on the piston 112 by introducing a third fluid (e.g., water) 304 into the first end 104 of chamber through the restrictor 114 . Because the third fluid 304 is flowing into the chamber 102 , the restrictor 114 allows the fluid to flow through both passage ways 202 , 204 .
- the piston 112 moves, the piston forces the fluid (e.g., the first fluid, the second fluid, or both) through the channels in the perforated piston 118 and mixes the fluids to generate a fluid mixture. By forcing the fluid through the perforated piston, a spray effect is generated in the chamber 102 .
- a spray of droplets is formed when the first fluid is injected into the second fluid.
- This spray effect increases the surface area of the second fluid 300 coming in contact with the first fluid 302 for more thorough mixing.
- the spray effect also provides agitation that ensures that that the fluid mixture becomes homogenous.
- the chamber 102 is vented to lower from the first end 104 of the chamber 102 .
- a valve (not shown) is opened and this causes a large pressure drop during equalization that is controlled by the restrictor 114 at the first end 104 of the chamber.
- the restrictor closes the second passage way 204 and partially restricts the fluid flow.
- the third fluid 304 is directed to the first high resistance passage way 202 and is slowly released.
- the restrictor 114 allows the piston 112 to descend in a controlled manner by restricting the rapid exit of the third fluid 304 from the chamber.
- the controlled descent of the piston 102 prevents damage to the piston and prevents slippage in the position of the perforated piston 118 (in embodiments where the perforated piston is movable).
- FIGS. 3B , 3 C, and 3 D can be repeated a plurality of times to ensure a thorough mixing process (e.g., to ensure that the fluid mixture becomes homogenous). Once the mixing is complete, in some embodiments, the valve 120 is open.
- the perforated piston 118 remains stationary. Then, in FIG. 3E , the perforated piston 118 and the piston 112 are pushed to the second end 106 of the chamber using the pump 122 so that the fluid mixture is pushed out of the chamber.
- the fluid mixture can then be analyzed optically by a fluid analyzer, such as a spectroscopic cell. In some embodiments, the fluid mixture can be analyzed optically by a fluid analyzer while still within the chamber 102 .
- FIG. 4 shows one example of a wireline logging system 400 at a well site.
- the wireline logging system 400 can be used to mix formation fluids with reactant fluids to detect particular chemical species within the formation fluids.
- a wireline tool 402 is lowered into a wellbore 404 that traverses a formation 406 using a cable 408 and a winch 410 .
- the wireline tool 402 is lowered down into the wellbore 404 and makes a measurement of the adjacent formation 406 at one or more sampling locations along the wellbore 404 .
- the data from these measurements is communicated through the cable 408 to surface equipment 412 , which may include a computer system for storing and processing the data obtained by the wireline tool 402 .
- the surface equipment 412 includes a truck that supports the wireline tool 402 . In another embodiment, however, the surface equipment may be located within a cabin on an off-shore platform.
- FIG. 5 shows another view of the wireline tool 402 .
- the wireline tool 402 includes a selectively extendable fluid admitting assembly (e.g., probe or packer) 502 .
- This assembly 502 extends into the formation 406 and withdraws formation fluid from the formation 406 (e.g., samples the formation) and into the wireline tool 402 .
- the formation fluid flows through the assembly 502 and into a main flow line 504 within a housing 506 of the tool 402 .
- a pump (not shown) can be used to withdraw the formation fluid from the formation 406 and pass the fluid through the main flow line 504 .
- the wireline tool 402 may also include a selectively extendable anchoring member 508 that is arranged to press the probe 502 assembly against the formation 406 .
- the wireline tool 402 also includes a fluid analyzer module 510 for analyzing at least a portion of the fluid in the flow line 504 .
- the fluid analyzer 510 can be an optical or spectroscopic cell that is used to optically measure and determine characteristics of the fluid within the flow line 504 (e.g., optical density and/or composition).
- FIG. 6 shows the wireline tool 402 in further detail.
- the wireline tool 402 includes a mixing apparatus 100 for mixing a first fluid with a second fluid, such as the one shown in FIG. 1 .
- the wireline tool 402 includes a fluid delivery system.
- the fluid delivery system includes two lines 602 , 604 that connect the main flow line 504 to different ends 104 , 106 of the mixing apparatus 100 .
- the fluid delivery system also includes a pump 606 , a top valve 608 , a bottom valve 610 , a wellbore valve 612 , and a second end valve 614 .
- FIGS. 3A-3E Operation of the fluid delivery system shown in FIG. 6 is described with respect to FIGS. 3A-3E .
- the process described below occurs downhole within a wellbore tool.
- top valve 608 and wellbore valve 612 are closed,
- second end valve 614 and bottom valve are open, and
- the pump 606 draws the piston 112 down towards the first end 104 of the chamber by pulling the third fluid 304 (e.g., formation fluid and/or drilling mud) out of the chamber 112 .
- the third fluid 304 e.g., formation fluid and/or drilling mud
- the reactant 302 is pre-loaded within the chamber 102 and there is no need to introduce the reactant into the chamber.
- a separate reactant bottle and valve assembly can be used to introduce the reactant into the chamber 102 and then introduce the formation fluid.
- the second end valve 604 is closed and the pump 606 pushes up on the piston 112 by reintroducing the third fluid 304 into the first end 104 of the chamber through the restrictor 114 . Because the third fluid 304 is flowing into the chamber 102 , the restrictor 114 allows the fluid to flow through both passage ways 202 , 204 .
- the piston forces fluid (e.g., the formation fluid, the reactant fluid, or both) through the channels in the perforated piston 118 and mixes the fluids to generate a fluid mixture. By forcing the fluid through the perforated piston, a spray effect is generated in the chamber 102 .
- fluid e.g., the formation fluid, the reactant fluid, or both
- a spray of droplets is formed when the reactant fluid is injected into the formation fluid.
- This spray effect increases the surface area of the reactant fluid 300 coming in contact with the formation fluid 302 for more thorough mixing.
- the spray effect also provides agitation that ensures that that the fluid mixture becomes homogenous.
- the chamber 102 is vented to lower pressure (e.g., pressure within the wellbore 404 ) from the first end 104 .
- the wellbore valve 612 is open to the wellbore environment 404 while the top valve 608 is closed.
- the first end 104 of the chamber is thus exposed to wellbore pressure.
- This causes a large pressure drop and pressure equalization that is controlled by the restrictor 114 at the first end 104 of the chamber.
- the restrictor closes the second passage way 204 (as shown in FIGS. 2A and 2B ) and partially restricts the fluid flow.
- the third fluid 304 is directed to the first high resistance passage way 202 and is slowly released.
- the restrictor 114 allows the piston 112 to descend in a controlled manner by restricting the rapid exit of the third fluid 304 from the chamber.
- the controlled descent of the piston 102 prevents damage to the piston and prevents slippage in the position of the perforated piston 118 .
- FIGS. 3B , 3 C, and 3 D can be repeated a plurality of times to ensure thorough mixing between the formation fluid and the reagent fluid (e.g., to ensure that the fluid mixture becomes homogenous).
- the perforated piston 118 and the piston 112 are pushed to the second end 106 of the chamber by opening the bottom valve 510 while keeping the top valve closed 608 .
- the fluid mixture is pushed into the main flow line 504 where it can be analyzed using the fluid analyzer 510 .
- the fluid analyzer 510 can detect whether there has been a reaction between the formation fluid and the reactant fluid. For example, in some cases, the reactant fluid and a particular chemical within the formation fluid can react and cause the fluid's optical absorbance to increase. This increase in optical absorbance in then detected by the fluid analyzer 510 . The increase in absorbance indicates the presence of the particular chemical within the formation fluid.
- the restrictor 114 allows the piston 112 to descend in a controlled manner by restricting the rapid exit of the third fluid 304 from the chamber 102 through the first opening 108 . Without the restrictor 114 , when the first end 104 of the chamber is opened to the wellbore pressure, the pressure imbalance would force the third fluid 304 out of the chamber, thereby, forcibly impacting the piston 112 against the first end 104 of the chamber and also potentially shifting the position of the perforated piston 118 within the chamber. Damage to the piston 112 and/or movement of the perforated piston 118 may render the apparatus inoperable for subsequent mixing cycles.
- the descent of the piston 112 can also be controlled by the pump 606 .
- the pump 606 would switch flow direction many times (e.g., into and out of the chamber), which is harsh on the pump and may reduce the life of the pump or render the pump inoperable.
- the restrictor 114 can be used to control the descent of the piston 112 without using the pump 606 to reverse the flow of fluid multiple times.
- the first fluid or the second fluid can be a liquid or a compressible fluid, such as a gas.
- the first fluid or the second fluid can be a sample fluid such as a formation fluid that is withdrawn from a subterranean formation.
- the first fluid or the second fluid can be a reactant fluid.
- the reactant fluid can be used to detect various chemicals, such as hydrogen sulfide (H2S), carbon dioxide (CO2), and mercury (Hg) within another fluid.
- the reactant fluid can use metal ions to react with a particular chemical within a sample fluid, such as a formation fluid. Further details regarding reactant fluids are provided in U.S. Patent Application Publication 2012/0276648, published on Nov. 1, 2012, and U.S. Patent Application Publication 2012/0149117, published Jun. 14, 2012. Both of these applications are hereby incorporated herein by reference in their entireties.
- Illustrative embodiments of the present disclosure are not limited to wireline logging operations, such as the ones shown in FIGS. 4 and 5 .
- the embodiments described herein can also be used with any suitable means of conveyance, such coiled tubing or drill pipe.
- various embodiments of the present disclosure may also be applied in logging-while-drilling (LWD) operations, sampling-while-drilling operations, measuring-while-drilling operations, production logging operations, or any other operation where sampling of formation fluid is performed.
- LWD logging-while-drilling
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Abstract
Apparatuses and methods for mixing a first fluid with a second fluid are described herein. One such apparatus includes a chamber that contains the first fluid and the second fluid. The apparatus also includes a piston that is positioned within the chamber and that is movable within the chamber. The piston can move back and forth to mix the first fluid and the second fluid together. The apparatus further includes a restrictor that provides for controlled movement of the piston and thus protects the piston and other components of the apparatus during operation.
Description
- The present application claims the benefit of U.S. Provisional Application Ser. No. 61/868419 filed August 21, 2013, which application is incorporated herein, in its entirety, by reference.
- This disclosure relates to mixing fluids and, more particularly, to an apparatus for mixing fluids.
- Mixing devices can be used to mix two different types of fluids together downhole within a wellbore tool. More specifically, a mixing device can be used to create a mixture between a reactant and a formation fluid. The reactant can be used to detect a particular chemical within the formation fluid. In one example, the reactant is a fluid that is selected to detect hydrogen sulfide (H2S) within the formation fluid by reacting with the hydrogen sulfide and producing a detectable optical characteristic. Accordingly, the mixing device can be used to generate a mixture by thoroughly mixing the reactant with the formation fluid. This mixture can then be analyzed optically to determine the presence of a particular chemical within the formation fluid. To facilitate this optical analysis, often the mixing device generates a homogenous mixture between the reactant and the formation fluid.
- Illustrative embodiments of the present disclosure are directed to a wellbore tool for mixing a first fluid with a second fluid. The wellbore tool includes a chamber with a first end, a second end, a first opening at the first end, and a second opening at the second end. The tool also includes a piston positioned within the chamber. The piston generates a seal between the first end and the second end of the chamber and is movable along the chamber towards the first end and towards the second end of the chamber. The tool further includes a restrictor positioned at the first end of the chamber. The restrictor allows the flow of fluid through the first opening and into the chamber and partially restricts flow of fluid through the first opening and out the chamber. Furthermore, the tool also includes a perforated piston positioned within the chamber between the piston and the second end of the chamber. The perforated piston includes a bottom surface, a top surface, and one or more channels that allow fluid to flow between the top surface and the bottom surface of the perforated piston.
- Various embodiments of the present disclosure are also directed to a downhole method for mixing a first fluid with a second fluid within a chamber. The chamber includes a piston, a perforated piston, a first end with a first opening, and a second end with a second opening. The method includes:
-
- (a) introducing the second fluid into the chamber;
- (b) introducing a third fluid into the first end of the chamber through the first opening to move the piston towards the perforated piston and the second end of the chamber so that the piston injects at least a portion of the first fluid through the one or more channels of the perforated piston and into the second fluid;
- (c) removing the third fluid through the first opening using a restrictor that partially restricts the flow of the third fluid through the first opening to move the piston away from the perforated piston and towards the first end of the chamber; and
- (d) repeating processes (b) and (c) one or more times to form a mixture between the first fluid and the second fluid.
- Further features and advantages will become more readily apparent from the following detailed description when taken in conjunction with the accompanying drawings:
-
FIG. 1 shows a mixing apparatus in accordance with one embodiment of the present disclosure; -
FIGS. 2A and 2B show a restrictor in accordance with one embodiment of the present disclosure; -
FIGS. 3A-3E show a method for mixing fluids in accordance with one embodiment of the present disclosure; -
FIG. 4 shows a wireline logging system at a well site in accordance with one embodiment of the present disclosure; -
FIG. 5 shows a wireline tool in accordance with one embodiment of the present disclosure; and -
FIG. 6 shows the wireline tool ofFIG. 5 in more detail. - Illustrative embodiments of the present disclosure are directed to an apparatus for mixing a first fluid with a second fluid. The second fluid can be a formation fluid that includes a gas, a liquid, or both. The first fluid can be a reactant fluid that reacts when mixed with the formation fluid to detect presence of a particular chemical species within the formation fluid (e.g., hydrogen sulfide (H2S), carbon dioxide (CO2), and mercury (Hg)). The mixing apparatus described herein includes a restrictor that protects components of the mixing apparatus during operation. Details of various embodiments are described below.
-
FIG. 1 shows an example of amixing apparatus 100 for mixing a first fluid with a second fluid. The mixingapparatus 100 includes achamber 102 with afirst end 104, asecond end 106, an opening 108 at the first end, and asecond opening 110 at the second end. Theapparatus 100 also includes apiston 112 positioned within the chamber. Thepiston 112 generates a seal between thefirst end 104 and thesecond end 106 of the chamber and is movable along the chamber towards the first end and towards the second end of the chamber. Theapparatus 100 further includes a restrictor 114 positioned at the first end of the chamber. Therestrictor 114 allows the flow of fluid through the first opening 108 and into thechamber 102 and partially restricts flow of fluid through the first opening and out the chamber. Furthermore, the apparatus also includes aperforated piston 118 positioned within thechamber 102 between thepiston 112 and thesecond end 106 of the chamber. Theperforated piston 118 includes a bottom surface, a top surface, and one or more channels that allow fluid to flow between the top surface and the bottom surface of the perforated piston. In some embodiments, theperforated piston 118 is affixed to walls of the chamber and is stationary. In other embodiments, theperforated piston 118 is movable along thechamber 102 towards the first end and towards the second end of the chamber. - The mixing
apparatus 100 also includes a fluid delivery system for providing fluids to the chamber. In this embodiment, the fluid delivery system include avalve 120 in fluid communication with thesecond opening 110 and apump 122 in fluid communication with the first opening 108. The fluid delivery system moves thepiston 112 towards thefirst end 104 of thechamber 102 and thus supplies a volume of the second fluid to the chamber through the second opening. In some embodiments, the first fluid is pre-loaded within thechamber 102. In other embodiments, the fluid delivery system first introduces the first fluid into thechamber 102 and then introduces the second fluid. The fluid delivery system also moves thepiston 112 towards theperforated piston 118 and thesecond end 106 of the chamber to inject at least a portion of the first fluid through the one or more channels of theperforated piston 118 and into the second fluid. - Movement of the
piston 112 can be accomplished by using thepump 122 to introduce a third fluid (e.g., water) into thefirst end 104 of the chamber. The third fluid is used to hydraulically push on thepiston 112 and move the piston towards theperforated piston 118 and thesecond end 106 of the chamber. Also, thepiston 112 can move back towards thefirst end 104 of the chamber by removing the third fluid from thechamber 102 through therestrictor 114. The third fluid can be removed using thepump 122 or by opening a valve (not shown) that creates a pressure difference between the first end of thechamber 104 and the second end of thechamber 106. For this reason, thefirst end 104 of the chamber can be referred to as the “hydraulic end.” -
FIGS. 2A and 2B show the restrictor 114 in more detail. Therestrictor 114 allows flow of fluid in a first direction (into the chamber 102) while partially restricting flow of fluid in an opposite direction (out of the chamber), as compared to the first direction. The restrictor 114 can also be referred to as a “restrictor piston” because the restrictor can be part of a piston that is positioned at thefirst end 104 of the chamber. In the specific example shown inFIG. 2 , therestrictor 114 includes two passage ways. Afirst passage way 202 includes a small hole that provides a flow path of high resistance from thechamber 102 to first opening 108. Asecond passage way 204 includes a constriction within the passage way. A ball with a diameter that is larger than the constriction is positioned within thepassage way 204. This configuration can be referred to as a “ball check valve” configuration. Other check valves can also be used within thesecond passage way 204. For example, diaphragm check valves, swing check valves, lift-check valves, in-line check valves, or duckbill valves can also be used. When in an open position, thesecond passage way 204 provides for greater fluid flow than thefirst passage way 202. -
FIGS. 2A and 2B show the two states of fluid flow through therestrictor 114. InFIG. 2A , when the third fluid is flowing out of thechamber 102 and through the first opening 108, the ball lodges within the constriction and prevents the flow of fluid through thesecond passage way 204. In this state, however, the first highresistance passage way 202 remains open and the third fluid flows through the first passage way. InFIG. 2B , when the third fluid is flowing into thechamber 102 and through the first opening 108, the ball is dislodged from the constriction and the third fluid flows through thesecond passage way 204, while also flowing through thefirst passage way 202. In this manner, therestrictor 114 allows the flow of fluid into thechamber 102, while partially restricting flow of fluid out the chamber. - In
FIG. 1 , therestrictor 114 and the first opening 108 are separate components. The third fluid first flows through the restrictor and then through the first opening 108, or vice versa. In other embodiments, therestrictor 114 and the first opening 108 are the same components. The one or more passageways within therestrictor 114 are the first opening 108. -
FIGS. 3A-3E show a method for mixing a first fluid with a second fluid using themixing apparatus 100 shown inFIG. 1 . InFIG. 3A , thepump 122 draws thepiston 112 down towards thefirst end 104 of the chamber and, thereby, pulls thesecond fluid 300 into thechamber 112. As explained above, in some embodiments, the first fluid (e.g., reactant) 302 is pre-loaded within thechamber 102 and there is no need for the pump to introduce the first fluid into the chamber. In other embodiments, thepump 122 can be used to introduce the first fluid into thechamber 102 and then introduce the second fluid. Once the second fluid has been introduced, in some embodiments, thevalve 120 is closed. - In.
FIGS. 3B and 3C , thepump 122 pushes up on thepiston 112 by introducing a third fluid (e.g., water) 304 into thefirst end 104 of chamber through therestrictor 114. Because thethird fluid 304 is flowing into thechamber 102, therestrictor 114 allows the fluid to flow through bothpassage ways piston 112 moves, the piston forces the fluid (e.g., the first fluid, the second fluid, or both) through the channels in theperforated piston 118 and mixes the fluids to generate a fluid mixture. By forcing the fluid through the perforated piston, a spray effect is generated in thechamber 102. In particular, a spray of droplets is formed when the first fluid is injected into the second fluid. This spray effect increases the surface area of thesecond fluid 300 coming in contact with thefirst fluid 302 for more thorough mixing. The spray effect also provides agitation that ensures that that the fluid mixture becomes homogenous. - In
FIG. 3D , thechamber 102 is vented to lower from thefirst end 104 of thechamber 102. For example, a valve (not shown) is opened and this causes a large pressure drop during equalization that is controlled by therestrictor 114 at thefirst end 104 of the chamber. In this case, because thethird fluid 304 is flowing out of thechamber 102, the restrictor closes thesecond passage way 204 and partially restricts the fluid flow. Thethird fluid 304 is directed to the first highresistance passage way 202 and is slowly released. Thus, therestrictor 114 allows thepiston 112 to descend in a controlled manner by restricting the rapid exit of thethird fluid 304 from the chamber. The controlled descent of thepiston 102 prevents damage to the piston and prevents slippage in the position of the perforated piston 118 (in embodiments where the perforated piston is movable). - The processes in
FIGS. 3B , 3C, and 3D can be repeated a plurality of times to ensure a thorough mixing process (e.g., to ensure that the fluid mixture becomes homogenous). Once the mixing is complete, in some embodiments, thevalve 120 is open. - In
FIGS. 3A , 3B, 3C, and 3D, theperforated piston 118 remains stationary. Then, inFIG. 3E , theperforated piston 118 and thepiston 112 are pushed to thesecond end 106 of the chamber using thepump 122 so that the fluid mixture is pushed out of the chamber. The fluid mixture can then be analyzed optically by a fluid analyzer, such as a spectroscopic cell. In some embodiments, the fluid mixture can be analyzed optically by a fluid analyzer while still within thechamber 102. - Illustrative embodiments of the present disclosure are directed to oilfield applications.
FIG. 4 shows one example of awireline logging system 400 at a well site. Thewireline logging system 400 can be used to mix formation fluids with reactant fluids to detect particular chemical species within the formation fluids. In this example, awireline tool 402 is lowered into awellbore 404 that traverses aformation 406 using acable 408 and awinch 410. Thewireline tool 402 is lowered down into thewellbore 404 and makes a measurement of theadjacent formation 406 at one or more sampling locations along thewellbore 404. The data from these measurements is communicated through thecable 408 tosurface equipment 412, which may include a computer system for storing and processing the data obtained by thewireline tool 402. In this case, thesurface equipment 412 includes a truck that supports thewireline tool 402. In another embodiment, however, the surface equipment may be located within a cabin on an off-shore platform. -
FIG. 5 shows another view of thewireline tool 402. Thewireline tool 402 includes a selectively extendable fluid admitting assembly (e.g., probe or packer) 502. Thisassembly 502 extends into theformation 406 and withdraws formation fluid from the formation 406 (e.g., samples the formation) and into thewireline tool 402. The formation fluid flows through theassembly 502 and into amain flow line 504 within ahousing 506 of thetool 402. A pump (not shown) can be used to withdraw the formation fluid from theformation 406 and pass the fluid through themain flow line 504. Thewireline tool 402 may also include a selectivelyextendable anchoring member 508 that is arranged to press theprobe 502 assembly against theformation 406. Thewireline tool 402 also includes afluid analyzer module 510 for analyzing at least a portion of the fluid in theflow line 504. Thefluid analyzer 510 can be an optical or spectroscopic cell that is used to optically measure and determine characteristics of the fluid within the flow line 504 (e.g., optical density and/or composition). -
FIG. 6 shows thewireline tool 402 in further detail. Thewireline tool 402 includes amixing apparatus 100 for mixing a first fluid with a second fluid, such as the one shown inFIG. 1 . Thewireline tool 402 includes a fluid delivery system. The fluid delivery system includes twolines 602, 604 that connect themain flow line 504 todifferent ends mixing apparatus 100. The fluid delivery system also includes apump 606, atop valve 608, a bottom valve 610, awellbore valve 612, and a second end valve 614. - Operation of the fluid delivery system shown in
FIG. 6 is described with respect toFIGS. 3A-3E . The process described below occurs downhole within a wellbore tool. InFIG. 3A , (i)top valve 608 andwellbore valve 612 are closed, (ii) second end valve 614 and bottom valve are open, and (iii) thepump 606 draws thepiston 112 down towards thefirst end 104 of the chamber by pulling the third fluid 304 (e.g., formation fluid and/or drilling mud) out of thechamber 112. As the piston is drawn down, a sample offormation fluid 300 enters thesecond end 106 of thechamber 102. As explained above, in some embodiments, thereactant 302 is pre-loaded within thechamber 102 and there is no need to introduce the reactant into the chamber. In other embodiments, a separate reactant bottle and valve assembly can be used to introduce the reactant into thechamber 102 and then introduce the formation fluid. - Once the formation fluid has been introduced, in.
FIGS. 3B and 3C , the second end valve 604 is closed and thepump 606 pushes up on thepiston 112 by reintroducing thethird fluid 304 into thefirst end 104 of the chamber through therestrictor 114. Because thethird fluid 304 is flowing into thechamber 102, therestrictor 114 allows the fluid to flow through bothpassage ways piston 112 moves, the piston forces fluid (e.g., the formation fluid, the reactant fluid, or both) through the channels in theperforated piston 118 and mixes the fluids to generate a fluid mixture. By forcing the fluid through the perforated piston, a spray effect is generated in thechamber 102. In particular, a spray of droplets is formed when the reactant fluid is injected into the formation fluid. This spray effect increases the surface area of thereactant fluid 300 coming in contact with theformation fluid 302 for more thorough mixing. The spray effect also provides agitation that ensures that that the fluid mixture becomes homogenous. - In
FIG. 3D , thechamber 102 is vented to lower pressure (e.g., pressure within the wellbore 404) from thefirst end 104. For example, thewellbore valve 612 is open to thewellbore environment 404 while thetop valve 608 is closed. Thefirst end 104 of the chamber is thus exposed to wellbore pressure. This causes a large pressure drop and pressure equalization that is controlled by therestrictor 114 at thefirst end 104 of the chamber. In this case, because thethird fluid 304 is flowing out of thechamber 102, the restrictor closes the second passage way 204 (as shown inFIGS. 2A and 2B ) and partially restricts the fluid flow. Thethird fluid 304 is directed to the first highresistance passage way 202 and is slowly released. Thus, therestrictor 114 allows thepiston 112 to descend in a controlled manner by restricting the rapid exit of thethird fluid 304 from the chamber. The controlled descent of thepiston 102 prevents damage to the piston and prevents slippage in the position of theperforated piston 118. - The processes in
FIGS. 3B , 3C, and 3D can be repeated a plurality of times to ensure thorough mixing between the formation fluid and the reagent fluid (e.g., to ensure that the fluid mixture becomes homogenous). - Once the mixing is complete, in
FIG. 3E , theperforated piston 118 and thepiston 112 are pushed to thesecond end 106 of the chamber by opening thebottom valve 510 while keeping the top valve closed 608. In this manner, the fluid mixture is pushed into themain flow line 504 where it can be analyzed using thefluid analyzer 510. Thefluid analyzer 510 can detect whether there has been a reaction between the formation fluid and the reactant fluid. For example, in some cases, the reactant fluid and a particular chemical within the formation fluid can react and cause the fluid's optical absorbance to increase. This increase in optical absorbance in then detected by thefluid analyzer 510. The increase in absorbance indicates the presence of the particular chemical within the formation fluid. - The
restrictor 114 allows thepiston 112 to descend in a controlled manner by restricting the rapid exit of thethird fluid 304 from thechamber 102 through the first opening 108. Without therestrictor 114, when thefirst end 104 of the chamber is opened to the wellbore pressure, the pressure imbalance would force thethird fluid 304 out of the chamber, thereby, forcibly impacting thepiston 112 against thefirst end 104 of the chamber and also potentially shifting the position of theperforated piston 118 within the chamber. Damage to thepiston 112 and/or movement of theperforated piston 118 may render the apparatus inoperable for subsequent mixing cycles. - The descent of the
piston 112 can also be controlled by thepump 606. However, to repetitively perform the processes shown inFIGS. 3B , 3C, and 3D, thepump 606 would switch flow direction many times (e.g., into and out of the chamber), which is harsh on the pump and may reduce the life of the pump or render the pump inoperable. The restrictor 114 can be used to control the descent of thepiston 112 without using thepump 606 to reverse the flow of fluid multiple times. - Further details regarding the
chamber 102, thepiston 112, theperforated piston 118, the fluid delivery system, the reactant fluids, and methods for mixing are described in U.S. Pat. No. 8,708,049, issued on Apr. 29, 2014, which is incorporated herein by reference in its entirety. - In various embodiments, the first fluid or the second fluid can be a liquid or a compressible fluid, such as a gas. The first fluid or the second fluid can be a sample fluid such as a formation fluid that is withdrawn from a subterranean formation. Also, the first fluid or the second fluid can be a reactant fluid. The reactant fluid can be used to detect various chemicals, such as hydrogen sulfide (H2S), carbon dioxide (CO2), and mercury (Hg) within another fluid. For example, the reactant fluid can use metal ions to react with a particular chemical within a sample fluid, such as a formation fluid. Further details regarding reactant fluids are provided in U.S. Patent Application Publication 2012/0276648, published on Nov. 1, 2012, and U.S. Patent Application Publication 2012/0149117, published Jun. 14, 2012. Both of these applications are hereby incorporated herein by reference in their entireties.
- Illustrative embodiments of the present disclosure are not limited to wireline logging operations, such as the ones shown in
FIGS. 4 and 5 . For example, the embodiments described herein can also be used with any suitable means of conveyance, such coiled tubing or drill pipe. Furthermore, various embodiments of the present disclosure may also be applied in logging-while-drilling (LWD) operations, sampling-while-drilling operations, measuring-while-drilling operations, production logging operations, or any other operation where sampling of formation fluid is performed. - Although several example embodiments have been described above, those skilled in the art will readily appreciate that many modifications are possible in the example embodiments without materially departing from the scope of this disclosure. Accordingly, such modifications are intended to be included within the scope of this disclosure.
Claims (18)
1. A wellbore tool for mixing a first fluid with a second fluid, the wellbore tool comprising:
a chamber having a first end, a second end, a first opening at the first end, and a second opening at the second end;
a piston positioned within the chamber, wherein the piston generates a seal between the first end and the second end of the chamber and is movable along the chamber towards the first end and towards the second end of the chamber;
a restrictor positioned at the first end of the chamber and configured (i) to allow the flow of fluid through the first opening and into the chamber and (ii) to partially restrict flow of fluid through the first opening and out the chamber; and
a perforated piston positioned within the chamber between the piston and the second end of the chamber, wherein the perforated piston comprises a bottom surface, a top surface, and one or more channels that allow fluid to flow between the top surface and the bottom surface of the perforated piston.
2. The wellbore tool of claim 1 , the first fluid is pre-loaded within the chamber.
3. The wellbore tool of claim 1 , further comprising:
a fluid delivery system configured (i) to move the piston toward the first end of the chamber in order to supply a volume of the second fluid to the chamber through the second opening and (ii) to move the piston towards the perforated piston and the second end of the chamber to inject at least a portion of the first fluid through the one or more channels of the perforated piston and into the second fluid.
4. The wellbore tool of claim 1 , wherein the second fluid is compressible.
5. The wellbore tool of claim 1 , wherein the second fluid is a formation fluid that comprises a gas, a liquid, or some combination thereof
6. The wellbore tool of claim 1 , wherein the first fluid is a reactant fluid.
7. The wellbore tool of claim 6 , wherein the reactant fluid is detects at least one of H2S, CO2, and Hg within the second fluid.
8. The wellbore tool of claim 1 , wherein the second fluid is a formation fluid and the wellbore tool further comprises:
a fluid admitting assembly for extending into a formation and withdrawing the formation fluid from the formation and into the wellbore tool.
9. The wellbore tool of claim 1 , further comprising:
a fluid analyzer configured to analyze a mixture of the first fluid and the second fluid.
10. A downhole method for mixing a first fluid with a second fluid within a chamber that comprises a piston, a perforated piston, a first end with a first opening, and a second end with a second opening, the method comprising:
(a) introducing the second fluid into the chamber;
(b) introducing a third fluid into the first end of the chamber through the first opening to move the piston towards the perforated piston and the second end of the chamber so that the piston injects at least a portion of the first fluid through the one or more channels of the perforated piston and into the second fluid;
(c) removing the third fluid through the first opening using a restrictor that partially restricts the flow of the third fluid through the first opening to move the piston away from the perforated piston and towards the first end of the chamber; and
(d) repeating processes (b) and (c) one or more times to form a mixture between the first fluid and the second fluid.
11. The downhole method of claim 10 , further comprising:
(e) moving the piston toward the second end of the chamber so that the fluid mixture exits the chamber through the second opening.
12. The downhole method of claim 10 , wherein the perforated piston remains stationary during process (a) through process (d).
13. The downhole method of claim 10 , wherein the first fluid is a recant fluid and the second fluid is a formation fluid.
14. The downhole method of claim 10 , wherein, at process (b), a spray of droplets is formed when the first fluid is injected into the second fluid.
15. The downhole method of claim 10 , wherein the second fluid is a formation fluid that comprises a gas, a liquid, or some combination thereof
16. The downhole method of claim 10 , the first fluid is pre-loaded within the chamber.
17. The downhole method of claim 10 , wherein process (a) through process (d) are performed within a wellbore tool.
18. The downhole method of claim 17 , further comprising:
withdrawing the formation fluid from a formation and into the wellbore tool.
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US14/465,503 US20150053400A1 (en) | 2013-08-21 | 2014-08-21 | Apparatus and method for mixing fluids |
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US201361868419P | 2013-08-21 | 2013-08-21 | |
US14/465,503 US20150053400A1 (en) | 2013-08-21 | 2014-08-21 | Apparatus and method for mixing fluids |
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US20110303409A1 (en) * | 2010-06-14 | 2011-12-15 | Ed Harrigan | Downhole Fluid Injection |
US20120097385A1 (en) * | 2010-09-29 | 2012-04-26 | Steven Villareal | Formation Fluid Sample Container Apparatus |
US20120145400A1 (en) * | 2010-12-13 | 2012-06-14 | Schlumberger Technology Corporation | method for mixing fluids downhole |
US20130020077A1 (en) * | 2011-07-22 | 2013-01-24 | Halliburton Energy Services, Inc. | Apparatus and method for improved fluid sampling |
US20140254303A1 (en) * | 2012-01-23 | 2014-09-11 | Merit Medical Systems, Inc. | Mixing syringe |
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US2580316A (en) * | 1949-04-12 | 1951-12-25 | Golden State Company Ltd | Apparatus for rapid solution and/or suspension of powdered solids |
US3507340A (en) * | 1968-02-05 | 1970-04-21 | Schlumberger Technology Corp | Apparatus for well completion |
US20100116493A1 (en) * | 2008-11-13 | 2010-05-13 | Halliburton Energy Services, Inc. | Coiled Tubing Deployed Single Phase Fluid Sampling Apparatus and Method for Use of Same |
US20110303409A1 (en) * | 2010-06-14 | 2011-12-15 | Ed Harrigan | Downhole Fluid Injection |
US20120097385A1 (en) * | 2010-09-29 | 2012-04-26 | Steven Villareal | Formation Fluid Sample Container Apparatus |
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