Artificial lift, concentric tubing production system for wells and method of using same

An artificial lift, concentric tubing production system for a well comprising:

• an upper concentric tubing string portion comprising an inner production tubing string positioned within an outer production tubing string;
• a flow crossover assembly connected to said upper concentric tubing string portion, said flow crossover assembly having first and second passageways, said inner production tubing string in fluid communication with said first passageway and said outer production tubing string in fluid communication with said second passageway;
• a progressive cavity pump in fluid communication with one of said passageways of said flow crossover assembly;
• and
• a lower apparatus in fluid communication with the other of said passageways of said flow crossover assembly.

An artificial lift, concentric tubing production system for a well comprising:

• an upper concentric tubing string portion comprising an inner production tubing string positioned within an outer production tubing string, said inner production tubing string including a tubing adapter stinger;
• a flow crossover assembly connected to said upper concentric tubing string portion, said flow crossover assembly having first and second passageways, said inner production tubing string in fluid communication with said first passageway and said outer production tubing string in fluid communication with said second passageway, said flow crossover assembly including an inner production pipe having a sealing bore and said tubing adapter stinger being adapted to sealingly engage said sealing bore;
• an upper transducer in fluid communication with one of said passageways of said flow crossover assembly;
• and
• a lower apparatus in fluid communication with the other of said passageways of said flow crossover assembly.

An artificial lift, concentric tubing production system for a well having an upper formation with an upper production fluid, a lower formation with a lower production fluid, and a casing perforated at each formation, the system comprising:

• an upper concentric tubing string portion comprising an inner production tubing string positioned within an outer production tubing string;
• a flow crossover assembly connected to said upper concentric tubing string portion, said flow crossover assembly having first and second passageways, said inner production tubing string in fluid communication with said first passageway and said outer production tubing string in fluid communication with said second passageway;
• an upper transducer in fluid communication with one of said passageways of said flow crossover assembly;
• a lower apparatus in fluid communication with the other of said passageways of said flow crossover assembly;
• a capsule containing said lower apparatus, said capsule having an upper outlet in fluid communication with one of said passageways of said flow crossover assembly and a lower inlet attached to a stinger;
• and
• a packer set in the casing between the upper and lower formations, said packer forming a seal with the casing and said stinger;
• wherein the lower production fluid is produced separately from the upper production fluid, the lower production fluid is produced via said lower apparatus and the upper production fluid is produced via said upper transducer.

An artificial lift, concentric tubing production system for a well including a formation having a combination gas and liquid fluid and a casing perforated at the formation, the system comprising:

• an upper concentric tubing string portion comprising an inner production tubing string positioned within an outer production tubing string;
• a flow crossover assembly connected to said upper concentric tubing string portion, said flow crossover assembly having first and second passageways, said inner production tubing string in fluid communication with said first passageway and said outer production tubing string in fluid communication with said second passageway;
• an upper transducer in fluid communication with one of said passageways of said flow crossover assembly;
• a lower apparatus in fluid communication with the other of said passageways of said flow crossover assembly;
• a capsule containing said lower apparatus, said lower apparatus comprising a separator, said capsule having an upper outlet in fluid communication with one of said passageways of said flow crossover assembly and a lower inlet, said capsule including perforations in an upper end of said capsule;
• and
• a packer set in the casing above the formation, said packer forming a seal with the casing and said capsule lower inlet;
• wherein the combination gas and liquid fluid is directed through said separator and a separated gas exits said separator through said capsule upper outlet and is directed through and to one of said flow crossover assembly passageways and a degassed liquid exits said separator through said capsule perforations.

A method of using an artificial lift, concentric tubing production system for wells comprising the steps of:

• lowering into a well bore a downhole assembly comprising an outer production tubing string portion connected to a flow crossover assembly having connected thereto an upper transducer in fluid communication with a first flow crossover passageway and a lower apparatus in fluid communication with a second flow crossover passageway, the first and second flow crossover passageways of the flow crossover assembly are concentric at the upper portion and non-concentric and parallel at the lower portion of the flow crossover assembly;
• installing an inner production tubing string within the outer production tubing string;
• and
• forming a releasable sealing engagement between the inner production tubing string and the first flow crossover passageway.

A method of using an artificial lift, concentric tubing production system for wells comprising the steps of:

• lowering into a well bore a downhole assembly comprising an outer production tubing string portion connected to a flow crossover assembly having connected thereto an upper transducer in fluid communication with a first flow crossover passageway and a lower apparatus in fluid communication with a second flow crossover passageway;
• installing an inner production tubing string within the outer production tubing string after the downhole assembly has been fully lowered into the well bore;
• and
• forming a releasable sealing engagement between the inner production tubing string and the first flow crossover passageway.

A method of using an artificial lift, concentric tubing production system for wells comprising the steps of:

• lowering into a well bore a downhole assembly comprising an outer production tubing string portion connected to a flow crossover assembly having connected thereto a pump in fluid communication with a first flow crossover passageway and a separator in fluid communication with a second flow crossover passageway;
• installing an inner production tubing string within the outer production tubing string;
• forming a releasable sealing engagement between the inner production tubing string and the first flow crossover passageway;
• and
• allowing retrieval of the separator independently of the pump.