Natural gas capture from a well stream

1. A process comprising:

receiving a well stream from a wellbore;

removing a first plurality of solids having a particle size greater than a particle size of sand from the well stream to form a first stream;

controlling a flow of the first stream to form a second stream comprising hydrocarbons, water, and sand;

separating the second stream in a multiphase separator into a first portion comprising light hydrocarbons in a gas phase and a second portion comprising liquid hydrocarbons, water, and sand;

flowing the first portion from the multiphase separator in a product gas stream, wherein the product gas stream has a back pressure device located therein;

removing a slurry comprising the water and sand from the multiphase separator;

removing, separately from the slurry, the liquid hydrocarbons from the multiphase separator; and

maintaining, by the back pressure device, a pressure in the multiphase separator in a range of from 15.7 psia to about 500 psia,

wherein the multiphase separator comprises:

a vessel;

an inlet connected to a side of the vessel and configured to receive the second stream;

a first outlet connected to the vessel and configured to receive the first portion;

a second outlet connected to a bottom of the vessel and configured to receive the slurry;

a third outlet connected to the side of the vessel and configured to receive the liquid hydrocarbons;

a first level sensor comprising a first float, wherein the first float has a first density greater than a density of water such that a bottom portion of the first float is below a top surface of the slurry in the multiphase separator; and

a second level senor comprising a second float, wherein the second float has a second density that is less than a density of the liquid hydrocarbons in the multiphase separator.

2. The process of claim 1 , wherein the pressure in the multiphase separator is about 50 psia.

3. The process of claim 1 , wherein the maintaining comprises:

sensing a pressure of the product gas stream or the pressure in the multiphase separator; and

adjusting a flow of the first portion through the back pressure device.

4. The process of claim 1 , further comprising:

flowing the first portion in the product gas stream to one or more compressors;

compressing the first portion in the one or more compressors to form a compressed gas stream; and

flowing the compressed gas stream to a sales pipeline, a vent, a flare, a gas processing unit, a storage tank, or a combination thereof.

5. The process of claim 1 , further comprising:

flowing, without compression, the first portion in the product gas stream to a sales pipeline, a vent, a flare, a gas processing unit, a storage tank, or a combination thereof.

6. The process of claim 1 , wherein removing the slurry is preformed intermittently.

7. The process of claim 1 , wherein removing the liquid hydrocarbons is performed intermittently.

8. The process of claim 1 , further comprising:

flowing the slurry in a slurry stream from the multiphase separator to a sand removal system.

9. The process of claim 8 , further comprising:

separating, in the sand removal system, the slurry into a residual gas stream, a liquid aqueous stream, and a solids stream.

10. The process of claim 1 , wherein the multiphase separator further comprises:

a plurality of angled plates, wherein each of the plurality of angled plates has an end connected to an inner wall of the vessel.

11. The process of claim 10 , wherein a top plate of the plurality of angled plates is connected to the inner wall at a location that is below where the inlet is connected to the vessel.

12. The process of claim 10 , wherein an angle between a bottom surface of each of the plurality of angled plates and the inner wall is in a range of from about 45° to about 75°.

13. The process of claim 10 , wherein an opposite end of each of the plurality of angled plates extends past a longitudinal axis of the vessel.

14. The process of claim 9 , further comprising:

combining the residual gas stream with at least a portion of the product gas stream to form a combined gas stream; and

flowing the combined gas stream to a flare.

15. The process of claim 1 , further comprising:

flowing the liquid hydrocarbons in a liquid hydrocarbon stream from the multiphase separator.

16. The process of claim 1 , wherein the slurry is removed based on a level of the slurry in the multiphase separator.

17. The process of claim 1 , wherein the liquid hydrocarbons are removed based on a level of the liquid hydrocarbons in the multiphase separator.