Method and apparatus for controlling fluid flow into a borehole

A method for controlling fluid flow between a borehole and a tubular, the method comprising:

• directing a fluid downhole via a string to a tubular body;
• increasing a first pressure of the fluid within the string, wherein increasing the first pressure to a selected level causes a check valve to move to an open position, wherein the selected level is greater than a second pressure of a borehole annulus outside the tubular;
• moving an insert sleeve to an open position, the insert sleeve being disposed within the tubular body, the check valve being at least partially disposed within the insert sleeve, the insert sleeve being moveable to an open locked position that comprises engagement of the insert sleeve with the check valve providing a flow path through the tubular body, the insert sleeve and a check valve sleeve disposed within the insert sleeve;
• and
• directing the fluid from the string to the borehole annulus via the open check valve.

A flow control apparatus to be used in a borehole, the apparatus comprising:

• a tubular body to be coupled to a tubular string and disposed in the borehole, the tubular string being coupled to a fluid source;
• an insert sleeve disposed within the tubular body to control fluid communication between the tubular body and the borehole;
• a check valve sleeve in fluid communication with the tubular string, the check valve sleeve being at least partially disposed within the insert sleeve;
• and
• a check valve disposed between the check valve sleeve and the tubular body and at least partially disposed within the insert sleeve, wherein a first pressure inside the check valve sleeve controls a position of the check valve relative to a passage in the check valve sleeve and thereby controls fluid communication between the check valve sleeve and an annulus in the borehole, wherein an open locked position of the insert sleeve comprises engagement of the insert sleeve with the check valve providing a flow path through the tubular body, the insert sleeve and the check valve sleeve.

A flow control apparatus for use in a borehole, the apparatus comprising:

• a tubular body extending from a string coupled to a fluid source;
• an insert sleeve disposed within the tubular body to control fluid communication between the tubular body and the borehole;
• a check valve sleeve at least partially disposed within the insert sleeve;
• a check valve at least partially disposed within the insert sleeve, wherein a change of a pressure inside the check valve sleeve causes the check valve to control fluid communication between the check valve sleeve and the borehole outside the tubular body;
• and
• a control line coupled to the insert sleeve configured to cause the insert sleeve to move to the open position and thereby lift the check valve to a fully open position, thereby enabling fluid flow from the borehole to the check valve sleeve and uphole.