US20130048276A1 - Frac water blending system - Google Patents
Frac water blending system Download PDFInfo
- Publication number
- US20130048276A1 US20130048276A1 US13/275,797 US201113275797A US2013048276A1 US 20130048276 A1 US20130048276 A1 US 20130048276A1 US 201113275797 A US201113275797 A US 201113275797A US 2013048276 A1 US2013048276 A1 US 2013048276A1
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- US
- United States
- Prior art keywords
- water
- pipeline
- flow
- level
- salination
- 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.)
- Abandoned
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 238000002156 mixing Methods 0.000 title claims abstract description 21
- 239000013505 freshwater Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 238000013019 agitation Methods 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims 1
- 239000000523 sample Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/062—Arrangements for treating drilling fluids outside the borehole by mixing components
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2607—Surface equipment specially adapted for fracturing operations
Definitions
- This invention relates to the provision of water for use with gas shale wells, and more particularly for provision of frac water therefor.
- Hydraulic stimulation is used in shale gas wells by using frac water to stimulate, or fracture the shale.
- Frac water includes either fresh water, or a blend of fresh and ‘flow back’ water.
- Flow back water is water that has previously been pumped into the shale formation, and is returned to the surface during testing and production periods.
- the flow back water generally contains dissolved solids, typically with high concentrations of dissolved salts.
- Flow back water can be generally reused if the salinity level, as measured in parts per million (ppm) is below a certain threshold. Generally, this threshold is in the range of 30,000-90,000 ppm, and in some applications may be even higher. Higher salinity levels mean higher fluid friction, making the water more difficult to pump at high pressures.
- the invention provides a means to maximize the flow back water that is reused, and maintain the maximum salinity allowed, in order to minimize the use of fresh water, use less energy than in previous methods and provide a more consistent blending of both streams of water.
- the system according to the invention blends the flow back water and fresh water prior to entering the tank, and discharges water with the correct salinity into the tank.
- the system includes an intake pipe for fresh water, an intake pipe for flow back water, with control valves on each pipe, a junction of the two streams and a long mixing pipeline which mixes the water either by making use of the turbulent flow regime of the individual streams of water from each intake pipe, or the mixing pipeline can be configured with agitation plates for mixing the incoming streams of water (useful if the flow is laminar), as well as a conductivity meter that measures the salinity levels of the mixed stream of water.
- the input water streams can be throttled with the valves to achieve the desired salinity (or conductivity) as displayed on the meter.
- the system according to the invention is portable and can be installed quickly, and it allows a large flow rate while under high pressure.
- the control valves can be automated with a simple algorithm, or can be manually controlled.
- Flow meters are used to track values of fresh and flow back water used for reporting purposes.
- the system is compatible with commonly used open top tank systems currently being used in the industry, with a small modification of the discharge/blending tube to discharge into a manifold or directly into a closed top tank.
- a water blending system for a gas shale well including: a first inlet pipeline receiving water from a freshwater source, the first inlet pipeline having a first valve; a second inlet pipeline receiving flow back water, the second inlet pipeline having a second control valve; and a third pipeline, receiving water flow from the first and second pipelines, the first pipelines having a salination level detector, the third pipeline flowing water into a tank; wherein the water flow of the first and second inlet pipelines is adjusted based on a salination level detected by the salination level detector.
- FIG. 1 is a top view of a blending pipe system according to the invention
- FIG. 2 is a side view thereof
- FIG. 4 is a flow chart showing a control process using the system.
- the system includes support skid 100 which structurally supports the system, and provides contact with the ground surface.
- Skid 100 provides stability, and may be an oilfield skid with features such as winching ears and lifting points, allowing skid 100 to be moved easily.
- Fresh water intake pipeline 110 and flow back water intake pipeline 120 lead into discharge pipeline 130 .
- Fresh water intake pipeline 110 receives water from a fresh water source.
- Flow back water intake pipeline 120 receives water that had previously been pumped into the shale formation, and has been reclaimed.
- Discharge pipeline 130 is configured to run the mixed water flow over wall 140 of tank 150 to allow the mixed water to enter tank 150 for use as frac water.
- Fresh water intake pipeline 110 and flow back water intake pipeline 120 are configured according to the incoming water system parameters, such as flow rates. In general, the water should enter pipelines 110 , 120 via approximately 10 ′′ pipelines.
- Pipelines 110 , 120 and 130 may be made from high-density polyethylene (HDPE) or stainless steel and may be internally coated with steel to resist the corrosiveness of the flow back water.
- the pipe diameter reduces along pipelines 110 , 120 as they approach junction 230 to increase the velocity of the water therein and provide a full pipe cross sectional flow as may be required by flow meters 190 , 200 .
- Control valves 170 , 180 are positioned downstream of flow meters 190 , 200 .
- By-pass tubes 210 , 220 may be placed to relieve pressure on pipelines 110 , 120 , if required.
- Pipelines 110 , 120 join and form a single discharge pipeline 130 at junction 230 wherein the fresh water and flow back water mix.
- Discharge pipeline 130 may include agitation plates (not shown) to assist in mixing the two incoming water streams.
- the mixed water is directed up and over the wall 140 of tank 150 by discharge pipeline 130 .
- Conductivity probe 240 is positioned near the top of discharge pipeline 130 (above the high water level) and several pipe diameters downstream of junction 230 to ensure that the water is well mixed.
- the mixed water is horizontally discharged into the depths of tank 150 to provide for mixing of the water within tank 150 .
- Siphon tubes 300 , 310 may be used to break the continuity of the water flow between tank 150 and discharge pipeline 130 in case remedial work is necessary or should pipeline 130 be disconnected. Siphon tubes 300 , 310 allow water to be easily emptied from discharge pipeline 130 . Drain port 315 is also present to drain discharge pipeline 130 easily.
- Flow meters 190 , 200 and conductivity probe 240 and display may be powered by a solar panel and/or a 24V battery system built into skid 100 or by a power system located at a control center nearby.
- the system either manually or automatically, first determines the salinity level of the mixed water flow in discharge pipeline 130 (step 1000 ). If the sanity level is at an acceptable level between predetermined maximum and minimum salinity levels (step 1050 ), no action is taken (step 1100 ).
- step 1050 If the salinity level is greater than the acceptable maximum salinity level (step 1050 ), then either the freshwater intake pipeline flow is increased and/or the flow back water intake pipeline flow is decreased using control valves 170 , 180 (step 1200 ). Then the salinity level is determined again (return to step 1000 ).
- step 1050 If the salinity level is less than the acceptable minimum salinity level (step 1050 ), then either the freshwater intake pipeline flow is decreased and/or the flow back water intake pipeline flow is increased using control valves 170 , 180 (step 1300 ) depending on whether maximum flow or maximum flow back water reuse is desired. Then the salinity level is determined again (return to step 1000 ). Flow rates are considered in determining either the maximum flow rate or the maximum reuse of flow back water, which depends on the flow of the fresh and flow back water streams and the incoming water salinity.
- the flow back water flow is decreased or the fresh water flow is increased (step 1200 ). Again the end goal of the user, be it to maximize the overall flow rate, or maximize the use of flow back water, will affect the determination.
- two desired modes of operation my be to achieve maximum flow of water to tank 150 or the maximum reuse of flow back water, depending on the volume of water needed for frac purposes, and while maintaining the desired salinity levels between and maximum and a minimum.
- the fresh water valve 170 remains at the maximum open position and the flow back water valve 180 is adjusted to the maximum level at which the maximum salinity level permitted is reached.
- the second mode the maximum reuse of flow back water, the flow back water valve 180 remains at the maximum open position and if the resultant salinity is higher than the maximum level permitted, then the fresh water valve 170 is gradually adjusted to achieve the desired salinity.
- the valve adjustments thus depend on the flows of the individual streams, the flow back water salinity level and the resultant salinity permitted
- the system can also be configured to mix the water in tank 150 to further reduce salinity levels by having pipeline 120 receive water from a bypass pipeline drawing water from tank 150 .
Abstract
Description
- The present application claims the benefit of priority under 35 U.S.C. 119(b) to Canadian Patent Application Serial No. 2750776 filed Aug. 26, 2011, in the name of inventor David J. Elliot, entitled “Frac Water Blending System”, all commonly owned herewith.
- This invention relates to the provision of water for use with gas shale wells, and more particularly for provision of frac water therefor.
- Hydraulic stimulation (fracture) is used in shale gas wells by using frac water to stimulate, or fracture the shale. Frac water includes either fresh water, or a blend of fresh and ‘flow back’ water. Flow back water is water that has previously been pumped into the shale formation, and is returned to the surface during testing and production periods. The flow back water generally contains dissolved solids, typically with high concentrations of dissolved salts. Flow back water can be generally reused if the salinity level, as measured in parts per million (ppm) is below a certain threshold. Generally, this threshold is in the range of 30,000-90,000 ppm, and in some applications may be even higher. Higher salinity levels mean higher fluid friction, making the water more difficult to pump at high pressures.
- It is difficult to accurately and easily blend two streams of water (fresh and flow back) into an output stream with a consistent desired salinity level. Previous solutions have been to pump individual streams of fresh and flow back water into a frac water tank (such as a Westeel™ c-ring), circulate the water, and constantly sample the water for salinity. The challenge is that fresh and salt water tend to stratify due to the difference in density, and they tend to separate with the heavier salty water sinking to the bottom of the tank. This makes getting a true water sample difficult as the water may not have blended well. It is also typically a manual operation, with many inaccuracies, and is also not energy efficient due to the increased pumping power needed for agitation (mixing) of the water.
- The invention provides a means to maximize the flow back water that is reused, and maintain the maximum salinity allowed, in order to minimize the use of fresh water, use less energy than in previous methods and provide a more consistent blending of both streams of water.
- The system according to the invention blends the flow back water and fresh water prior to entering the tank, and discharges water with the correct salinity into the tank. The system includes an intake pipe for fresh water, an intake pipe for flow back water, with control valves on each pipe, a junction of the two streams and a long mixing pipeline which mixes the water either by making use of the turbulent flow regime of the individual streams of water from each intake pipe, or the mixing pipeline can be configured with agitation plates for mixing the incoming streams of water (useful if the flow is laminar), as well as a conductivity meter that measures the salinity levels of the mixed stream of water. The input water streams can be throttled with the valves to achieve the desired salinity (or conductivity) as displayed on the meter.
- There are several ways of adjusting the intake pipelines. As an example, two different modes may either provide for maximum flow back water flow or maximum fresh water flow. If the maximum water flow is desired, then typically the fresh water pipeline valve will stay at maximum open and the flow back water pipeline valve will be throttled to provide the maximum salinity permitted; and if the maximum reuse of flow back water is desired, then the flow back water pipeline valve is open to its maximum and if the resultant salinity is higher than the maximum permitted, the fresh water pipeline valve is gradually closed to achieve the permitted salinity. Therefore, the mixing of the flow back water and fresh water depends on the flows of the two pipelines, the flow back water salinity and the resultant salinity permitted. An operator may have confidence that the frac water being used for fracture stimulation is indeed at the correct salinity level, and maximum reuse of the flow back water is achieved, which is best for the environment, and for longevity of the industry.
- The system according to the invention is portable and can be installed quickly, and it allows a large flow rate while under high pressure. The control valves can be automated with a simple algorithm, or can be manually controlled. Flow meters are used to track values of fresh and flow back water used for reporting purposes. The system is compatible with commonly used open top tank systems currently being used in the industry, with a small modification of the discharge/blending tube to discharge into a manifold or directly into a closed top tank.
- A water blending system for a gas shale well is provided, including: a first inlet pipeline receiving water from a freshwater source, the first inlet pipeline having a first valve; a second inlet pipeline receiving flow back water, the second inlet pipeline having a second control valve; and a third pipeline, receiving water flow from the first and second pipelines, the first pipelines having a salination level detector, the third pipeline flowing water into a tank; wherein the water flow of the first and second inlet pipelines is adjusted based on a salination level detected by the salination level detector.
-
FIG. 1 is a top view of a blending pipe system according to the invention; -
FIG. 2 is a side view thereof; -
FIG. 3 is a rear view thereof; and -
FIG. 4 is a flow chart showing a control process using the system. - The system, as shown in
FIGS. 1 through 3 , includes support skid 100 which structurally supports the system, and provides contact with the ground surface. Skid 100 provides stability, and may be an oilfield skid with features such as winching ears and lifting points, allowing skid 100 to be moved easily. - Fresh water intake pipeline 110 and flow back
water intake pipeline 120 lead intodischarge pipeline 130. Fresh water intake pipeline 110 receives water from a fresh water source. Flow backwater intake pipeline 120 receives water that had previously been pumped into the shale formation, and has been reclaimed.Discharge pipeline 130 is configured to run the mixed water flow overwall 140 of tank 150 to allow the mixed water to enter tank 150 for use as frac water. - Fresh water intake pipeline 110 and flow back
water intake pipeline 120 are configured according to the incoming water system parameters, such as flow rates. In general, the water should enterpipelines 110, 120 via approximately 10″ pipelines.Pipelines pipelines 110, 120 as they approachjunction 230 to increase the velocity of the water therein and provide a full pipe cross sectional flow as may be required byflow meters 190, 200.Control valves 170, 180 are positioned downstream offlow meters 190, 200. By-pass tubes 210, 220 may be placed to relieve pressure onpipelines 110, 120, if required. -
Pipelines 110, 120 join and form asingle discharge pipeline 130 atjunction 230 wherein the fresh water and flow back water mix.Discharge pipeline 130 may include agitation plates (not shown) to assist in mixing the two incoming water streams. The mixed water is directed up and over thewall 140 of tank 150 bydischarge pipeline 130. Conductivity probe 240 is positioned near the top of discharge pipeline 130 (above the high water level) and several pipe diameters downstream ofjunction 230 to ensure that the water is well mixed. The mixed water is horizontally discharged into the depths of tank 150 to provide for mixing of the water within tank 150. -
Siphon tubes 300, 310 may be used to break the continuity of the water flow between tank 150 anddischarge pipeline 130 in case remedial work is necessary or shouldpipeline 130 be disconnected.Siphon tubes 300, 310 allow water to be easily emptied fromdischarge pipeline 130. Drain port 315 is also present to draindischarge pipeline 130 easily. -
Flow meters 190, 200 may be magnetic flow meters, which require no moving parts, and are not susceptible to fouling from harsh water conditions.Meters 190, 200 are used to track total and instantaneous flows of the two input water streams frompipelines 110, 120 and can serve as part of the automated system for control of the water streams. Conductivity probe or salinity meter 240 measures the conductivity of the output mixed water stream inpipeline 130. The conductivity level is displayed in a convenient location, and water conductivity can be converted to a salinity level. Meter 240 can be configured to display salinity in PPM or uS/cm (micro Siemens/Centimetre). -
Flow meters 190, 200 and conductivity probe 240 and display may be powered by a solar panel and/or a 24V battery system built intoskid 100 or by a power system located at a control center nearby. - As shown in
FIG. 4 , in use, the system, either manually or automatically, first determines the salinity level of the mixed water flow in discharge pipeline 130 (step 1000). If the sanity level is at an acceptable level between predetermined maximum and minimum salinity levels (step 1050), no action is taken (step 1100). - If the salinity level is greater than the acceptable maximum salinity level (step 1050), then either the freshwater intake pipeline flow is increased and/or the flow back water intake pipeline flow is decreased using
control valves 170, 180 (step 1200). Then the salinity level is determined again (return to step 1000). - If the salinity level is less than the acceptable minimum salinity level (step 1050), then either the freshwater intake pipeline flow is decreased and/or the flow back water intake pipeline flow is increased using
control valves 170, 180 (step 1300) depending on whether maximum flow or maximum flow back water reuse is desired. Then the salinity level is determined again (return to step 1000). Flow rates are considered in determining either the maximum flow rate or the maximum reuse of flow back water, which depends on the flow of the fresh and flow back water streams and the incoming water salinity. - Alternatively, if the salinity level is greater than the maximum wanted, then the flow back water flow is decreased or the fresh water flow is increased (step 1200). Again the end goal of the user, be it to maximize the overall flow rate, or maximize the use of flow back water, will affect the determination.
- For example, two desired modes of operation my be to achieve maximum flow of water to tank 150 or the maximum reuse of flow back water, depending on the volume of water needed for frac purposes, and while maintaining the desired salinity levels between and maximum and a minimum. In the first mode, to obtain maximum flow of water to tank 150, the
fresh water valve 170 remains at the maximum open position and the flow back water valve 180 is adjusted to the maximum level at which the maximum salinity level permitted is reached. In the second mode, the maximum reuse of flow back water, the flow back water valve 180 remains at the maximum open position and if the resultant salinity is higher than the maximum level permitted, then thefresh water valve 170 is gradually adjusted to achieve the desired salinity. The valve adjustments thus depend on the flows of the individual streams, the flow back water salinity level and the resultant salinity permitted - The system can also be configured to mix the water in tank 150 to further reduce salinity levels by having
pipeline 120 receive water from a bypass pipeline drawing water from tank 150. - The above-described embodiments have been provided as examples, for clarity in understanding the invention. A person with skill in the art will recognize that alterations, modifications and variations may be effected to the embodiments described above while remaining within the scope of the invention as defined by claims appended hereto.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2750776 | 2011-08-26 | ||
CA2750776A CA2750776A1 (en) | 2011-08-26 | 2011-08-26 | Frac water blending system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130048276A1 true US20130048276A1 (en) | 2013-02-28 |
Family
ID=47741957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/275,797 Abandoned US20130048276A1 (en) | 2011-08-26 | 2011-10-18 | Frac water blending system |
Country Status (2)
Country | Link |
---|---|
US (1) | US20130048276A1 (en) |
CA (1) | CA2750776A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120111569A1 (en) * | 2010-11-04 | 2012-05-10 | Chevron U.S.A. Inc. | Chemical delivery apparatus, system, and method for hydrocarbon production |
CN104355364A (en) * | 2014-11-25 | 2015-02-18 | 天津水运工程勘察设计院 | Automatic oily water discharge system for ballast water storage tank |
CN114427422A (en) * | 2020-09-25 | 2022-05-03 | 中国石油化工股份有限公司 | Multi-section fracturing and intelligent well completion integrated pipe column and method |
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US3710811A (en) * | 1969-07-14 | 1973-01-16 | Diamond Crystal Salt Co | Method and apparatus for controlling the salinity of a solution |
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US20130213893A1 (en) * | 2012-02-22 | 2013-08-22 | Richard Paul Posa | System and method for treating produced, desalted and flow back water |
-
2011
- 2011-08-26 CA CA2750776A patent/CA2750776A1/en not_active Abandoned
- 2011-10-18 US US13/275,797 patent/US20130048276A1/en not_active Abandoned
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Publication number | Priority date | Publication date | Assignee | Title |
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US20120111569A1 (en) * | 2010-11-04 | 2012-05-10 | Chevron U.S.A. Inc. | Chemical delivery apparatus, system, and method for hydrocarbon production |
US9127547B2 (en) * | 2010-11-04 | 2015-09-08 | Chevron U.S.A. Inc. | Chemical delivery apparatus, system, and method for hydrocarbon production |
CN104355364A (en) * | 2014-11-25 | 2015-02-18 | 天津水运工程勘察设计院 | Automatic oily water discharge system for ballast water storage tank |
CN104355364B (en) * | 2014-11-25 | 2016-01-20 | 天津水运工程勘察设计院 | Water ballast s.t.o. sewage automatic discharging device |
CN114427422A (en) * | 2020-09-25 | 2022-05-03 | 中国石油化工股份有限公司 | Multi-section fracturing and intelligent well completion integrated pipe column and method |
Also Published As
Publication number | Publication date |
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CA2750776A1 (en) | 2013-02-26 |
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