TREA

System and method for delivering proppant to a blender

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Information

  • Patent Grant
  • 9670752
  • Patent Number
    9,670,752
  • Date Filed
    Tuesday, September 15, 2015
    9 years ago
  • Date Issued
    Tuesday, June 6, 2017
    7 years ago
Information
Abstract
A system for conveying proppant includes a conveyor system having a conveyor belt, the conveyor belt receiving proppant from one or more containers having proppant stored therein distributed along the conveyor system and carrying the proppant away from the conveyors. The system also includes a conveyor assembly having one or more joints to enable expansion and collapse of the conveyor belt. The system further includes a proppant chute positioned at an end of the conveyor assembly, the proppant chute having an opening to direct the proppant from the conveyor belt into a blending hopper, the proppant chute being positioned at a higher elevation than an inlet of the blending hopper such that the proppant exits the proppant chute into the blending hopper via gravity feed.
Description
BACKGROUND
Summary

In an embodiment, a system for conveying proppant includes a conveyor system having a conveyor belt, the conveyor belt receiving proppant from one or more containers having proppant stored therein distributed along the conveyor system and carrying the proppant away from the conveyors. The system also includes a conveyor assembly having one or more joints to enable expansion and collapse of the conveyor belt. The system further includes a proppant chute positioned at an end of the conveyor assembly, the proppant chute having an opening to direct the proppant from the conveyor belt into a blending hopper, the proppant chute being positioned at a higher elevation than an inlet of the blending hopper such that the proppant exits the proppant chute into the blending hopper via gravity feed.


In another embodiment, a system to convey proppant includes a conveyor stem to receive and support one or more containers having proppant stored therein. The system also includes a conveyor belt positioned beneath the one or more containers to receive the proppant dispensed from the one or more containers and to transport the proppant away from the one or more containers. Moreover, the system includes a conveyor assembly positioned at an end of the conveyor system, the conveyor assembly baying an inclined section that increases a vertical position of the conveyor belt relative to a ground plane, one or more joints positioned along the conveyor assembly to enable expansion and compaction of the conveyor belt and a proppant chute positioned at the end of the conveyor assembly, the proppant chute moveable to direct the proppant away from the convey belt. Additionally, the system includes a blending hopper positioned proximate the conveyor system to receive and mix the proppant with one or more proppant fluids for injection into a well. The system also includes a tub positioned at an inlet of the blending hopper between the blending hopper and the proppant chute, the tub being removable from the blending hopper and positioned at a lower elevation than the proppant chute when coupled to the blending hopper.


In a further embodiment, a method includes dispensing proppant from a container positioned on a conveyor system onto a conveyor belt. The method also includes transporting the proppant, via the conveyor belt, away from the container and toward a conveyor assembly. The method further includes transferring the proppant to a proppant chute such that the elevation of the proppant on the conveyor belt is increased. The method also includes directing the proppant into a blending hopper via gravity feed.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is a perspective view of a blender unit;



FIG. 2 is a side view of the blender unit of FIG. 1;



FIG. 3 is a top view of the blender unit of FIGS. 1 and 2; and



FIG. 4 is a side view of a blender unit and proppant delivery system according to an embodiment of the present invention.





DETAILED DESCRIPTION


FIGS. 1-3 illustrate a proppant blender unit 10 mounted on a trailer 12 for ease of transport. The purpose of the blender unit 10 is to mix proppant at a well site prior to introduction of the proppant Into a well during a hydraulic fracturing operation. Typically, the blender unit 10 has a tub 14 for receiving proppant from a conveyor (not shown). Once deposited in the tub 14, the proppant must be lifted to the inlet 16 of a blending hopper 18. This may be accomplished using auger units 20 that extend from the tub 14 to the inlet 16 of the blending hopper 18. Each auger unit consists of an auger housing 22 that encases an auger screw (not shown). As the auger screw turns, the surfaces of the screw lift the proppant from the tub 14, through the auger housing 22 and upward to the inlet 16 of the blending hopper 18. At the inlet 16 of the blending hopper 18, the proppant is expelled from the auger housing 22 into the inlet 16 through a proppant chute 24.


One problem with the type of blender unit 10 shown and described in FIGS. 1-3 is that the auger screw quickly becomes worn, and must be replaced or serviced at frequent intervals. One reason for this is the course nature of the proppant, which causes friction between proppant particles and the auger screw. This friction degrades and wears down the material of the auger screw over time.


According to one embodiment of the invention, a system for delivering proppant to a blending hopper 118 is provided wherein the tub 114 is positioned above the inlet 116 of the blending hopper 118. Proppant can be delivered to the tub 114 via a proppant chute 126 attached to a conveyor assembly 128. A conveyor belt 130 collects sand from proppant containers 132 which deposit proppant directly from outlets (not shown) in the bottom of the containers 132 onto the conveyor belt 130. The conveyor belt 130 then conveys the proppant at an angle up to a height at least as high as the tub 114 through the conveyor assembly 128. Thereafter, the proppant is discharged from the conveyor belt 130, through the proppant chute 126, and into the tub 114.


Because the tub 114 is positioned directly above the blending hopper 118, the proppant can be fed into the blending hopper 118 through an outlet in the bottom of the tub 114 by gravity. Thus, there is no need for any auger units to transport the proppant from the tub 114 to the blending hopper 118.


As shown in FIG. 4, the conveyor assembly 128 can be collapsible and extendable around one or more joints 134, thereby allowing for compact storage of the components of the system during transport, as well as convenient use of the proppant chute 126 with conventional blending units, where the hopper is located close to the ground. In addition, in certain embodiments, the tub 114 may be removable from the top of the blending hopper 118, and can be stored directly on the trailer or elsewhere to reduce the height of the blender unit during transport.


Furthermore, although the embodiment of FIG. 4 illustrates the system of the present invention with the tub 114 mounted on top of the blending hopper 118 and without auger units. In some embodiments, other types of blending units may be used, such as those shown in FIGS. 1-3. In such embodiments, the tub 14 may remain close to the ground, and the proppant chute 114 can deliver proppant directly into the inlet 16 or the blending hopper 18 without first going through the tub 14. In fact, this can be accomplished with the auger units 20 in place, thereby allowing use of the present invention with any known blender unit.


Another aspect of the present invention includes a control system. Such a control system is configured to measure the flow of sand between the tub 114 and the blending hopper 118. In one example embodiment, the sand level in the tub 114 can be measured by a sensor. The rate of change of the sand level in the tub 114 can be monitored by weight. Simultaneously, another sensor may provide feedback to control mechanisms for the conveyor belt speed and the rate of discharge of the proppant from the container 132 onto the conveyor belt 130. This will help to insure that the amount of proppant in the tub 114 at any given time is maintained even as pump rates at the well, and thus the rate of proppant consumed by the well, varies.


This application is related to and claims priority to, and the benefit of, U.S. Provisional Application No. 62/050,752, filed Sep. 15, 2014, titled “System and Method for Delivering Proppant To A Blender,” and U.S. Provisional Application No. 62/217,117, filed Sep. 11, 2015, titled “System and Method for Delivering Proppant To A Blender,” each of which are incorporated herein by reference in their entireties.


In one embodiment, all of the above-described controls can be integrated in one place for ease of operation. Options may also exist for introducing additives to the mixture, such as guar or dry chemicals.

Claims
  • 1. A system for conveying proppant, the system comprising: a conveyor system having a conveyor belt and a control system to measure the flow of proppant a blending hopper, the conveyor belt receiving proppant from one or more containers having proppant stored therein distributed along the conveyor system and carrying the proppant away from the conveyors system;a conveyor assembly extending at an upward angle away from the one or more containers to thereby increase an elevation of the proppant positioned on the conveyor belt;a proppant chute positioned at an end of the conveyor assembly, the proppant chute having an opening to direct the proppant from the conveyor belt into the blending hopper, the proppant chute being positioned at a higher elevation than an inlet of the blending hopper such that the proppant exits the proppant chute into the blending hopper via gravity feed; anda tub positioned upstream of the inlet of the blending hopper to direct the proppant from the proppant chute into the blending hopper, wherein the tub is at a lower elevation than the proppant chute and is coupled to the blending hopper.
  • 2. The system of claim 1, wherein the tub is removable from the blending hopper to reduce the vertical height of the blending hopper to facilitate transportation of the blending hopper.
  • 3. The system of claim 1, wherein the one or more containers comprise a plurality of containers arranged in a side-by-side configuration along a length of the conveyor system.
  • 4. The system of claim 1, wherein the control system comprises one or more sensors for measuring a weight of the proppant, a speed of the conveyor belt, a rate of discharge from the one or more containers, or a combination thereof.
  • 5. A system to convey proppant, the system comprising: a conveyor system to receive and support one or more containers having proppant stored therein;a conveyor belt positioned beneath the one or more containers to receive the proppant dispensed from the one or more containers and to transport the proppant away from the one or more containers;a conveyor assembly positioned at an end of the conveyor system, the conveyor assembly having an inclined section that increases a vertical position of the conveyor belt relative to a ground plane;a proppant chute positioned at the end of the conveyor assembly, the proppant chute moveable to direct the proppant away from the conveyor belt;a blending hopper positioned proximate the conveyor system to receive and mix the proppant with one or more proppant fluids for injection into a well; anda tub positioned at and coupled to an inlet of the blending hopper between the blending hopper and the proppant chute, the tub being removable from the blending hopper and positioned at a lower elevation than the proppant chute when coupled to the blending hopper.
  • 6. The system of claim 5, comprising a control system to measure a flow rate of proppant to the blending hopper via one or more sensors.
  • 7. The system of claim 6, wherein a conveyor belt speed, a container dispersion rate, or a combination thereof is adjusted via the control system based on an output from the one or more sensors indicative of the flow rate.
  • 8. The system of claim 6, wherein the one or more sensors is a weight sensor positioned in the tub to monitor the weight of proppant in the tub as the proppant flows to the blending hopper.
  • 9. The system of claim 6, wherein the one or more sensors is a level sensor positioned in the tub to monitor a quantity of proppant in the tub as the proppant flows to the blending hopper.
  • 10. The system of claim 6, wherein the control system adjusts one or more parameters of the conveyor system to maintain a substantially constant quantity of proppant in the tub during wellbore operations.
  • 11. A method comprising: dispensing proppant from a container positioned on a conveyor system onto a conveyor belt;transporting the proppant, via the conveyor belt, away from the container and toward a conveyor assembly;transferring the proppant to a proppant chute such that the elevation of the proppant on the conveyor belt is increased;directing the proppant into a blending hopper via gravity feed; anddirecting the proppant into a tub positioned between the proppant chute and the blending hopper, the tub being removably coupled to the blending hopper and having a lower elevation than the proppant on the conveyor belt.
  • 12. The method of claim 11, comprising adjusting a flow rate of the proppant to the blending hopper via a control system based on feedback from a weight sensor positioned in the tub, the weight sensor outputting a signal to the control system indicative of a quantity of proppant flowing to the blending hopper.
  • 13. The method of claim 11, comprising adjusting a flow rate of the proppant from the container via a control system based on feedback from one or more sensors positioned downstream of the container.
  • 14. The method of claim 13, comprising adjusting a speed of the conveyor belt via feedback from the one or more sensors.
RELATED APPLICATIONS

This application is related to and claims priority to, and the benefit of, U.S. Provisional Application No. 62/050,752, filed Sep. 15, 2014, titled “System and Method for Delivering Proppant To A Blender,” and U.S. Provisional Application No. 62/217,117, filed Sep. 11, 2015, titled “System and Method for Delivering Proppant To A Blender,” each of which are incorporated herein by reference in their entireties.

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Related Publications (1)
Number Date Country
20160355346 A1 Dec 2016 US
Provisional Applications (2)
Number Date Country
62050752 Sep 2014 US
62217117 Sep 2015 US