Integrated multi-stage sand separation system

1. A separator system, comprising:

a separator comprising an inlet configured to receive a mixed fluid, a first outlet, and a second outlet, the separator being configured to at least partially separate a solids component of the mixed fluid from a liquid component and a gaseous component of the mixed fluid, and to direct the separated solids component to the first outlet and at least some of the liquid and gaseous components to the second outlet; and

a pressure tank physically coupled to the separator, the pressure tank comprising:

a partition wall defining a collection chamber and a separation chamber in the pressure tank, wherein the partition wall prevents fluid flow between the collection chamber and the separation chamber when a pressure differential therebetween is less than a predetermined level;

a pressure-relief valve coupled to the partition wall, wherein the pressure-relief valve allows fluid flow between the collection chamber and the separation chamber when the pressure differential therebetween is greater than the predetermined level;

a first inlet communicating with the collection chamber and coupled to the first outlet of the separator, the first inlet being configured to receive at least some of the solids component from the first outlet and provide the solids component to the collection chamber;

a second inlet communicating with the separation chamber and in communication with the second outlet of the separator, wherein the second inlet is configured to receive at least some of the liquid component and the gaseous component from the second outlet;

a first drain in communication with the collection chamber;

a first liquid outlet in communication with the separation chamber, wherein the first liquid outlet is configured to allow at least a portion of the liquid component that is received into the separation chamber to be removed therefrom; and

a gas outlet in communication with the separation chamber, wherein the gas outlet is configured to allow at least a portion of a gaseous component that is received into the separation chamber to be removed therefrom.

2. The separator system of claim 1 , wherein the separator comprises a cyclone separator.

3. The separator system of claim 1 , wherein the separator comprises a flange connection physically connecting the separator to the pressure tank.

4. The separator system of claim 1 , wherein the pressure tank further comprises a washout system positioned at least partially in the collection chamber, and wherein the washout system is configured to wash solids toward the first drain.

5. The separator system of claim 1 , wherein the separation chamber comprises a weir, wherein the separator system defines a first liquid collection region on one side of the weir, and a second liquid collection region on a second side of the weir, and wherein the first liquid outlet is in communication with the first liquid collection region, and a second liquid outlet of the pressure tank is in communication with the second liquid collection region.

6. The separator system of claim 5 , wherein a gas collection region extends between the partition wall and an end of the pressure tank, and wherein the gas outlet is in communication with the gas collection region.

7. A pressure tank comprising:

a partition wall between a collection chamber and a separation chamber defined in the pressure tank;

a pressure-relief valve coupled to the partition wall, wherein the pressure-relief valve allows fluid flow between the collection chamber and the separation chamber when a pressure differential therebetween is greater than a predetermined level;

a first inlet communicating with the collection chamber and physically coupled to a first outlet of a separator, wherein the first inlet receives a solids component from the first outlet and provide the solids component to the collection chamber;

a second inlet communicating with the separation chamber and in communication with a second outlet of the separator, wherein the second inlet receives a liquid component and a gaseous component from the second outlet of the separator;

a first drain in communication with the collection chamber;

a first liquid outlet in communication with the separation chamber, wherein the first liquid outlet allows at least a portion of the liquid component that is received into the separation chamber to be removed therefrom; and

a gas outlet in communication with the separation chamber, wherein the gas outlet allows at least a portion of the gaseous component that is received into the separation chamber to be removed therefrom.

8. The pressure tank of claim 7 , further comprising a washout system positioned at least partially in the collection chamber, wherein the washout system is configured to wash solids toward the first drain.

9. The pressure tank of claim 7 , further comprising a weir positioned in the separation chamber, wherein the separation system defines a first liquid collection region on one horizontal side of the weir, and a second liquid collection region on a second horizontal side of the weir, and wherein the first liquid outlet is in communication with the first liquid collection region, and a second liquid outlet of the pressure tank is in communication with the second liquid collection region.

10. The pressure tank of claim 7 , wherein a gas collection region extends between the partition wall and an end of the pressure tank in the separation chamber, and wherein the gas outlet is in communication with the gas collection region.

11. The pressure tank of claim 7 , wherein the pressure tank is configured to be horizontally-oriented, such that the collection chamber is horizontally adjacent to the separation chamber.

12. The pressure tank of claim 7 , wherein the partition wall prevents fluid flow between the collection chamber and the separation chamber when the pressure differential therebetween is less than the predetermined level.