CONCENTRIC MANDREL FOR INTERMITTENT GAS LIFT WITH ACCUMULATION CHAMBER

Abstract

The invention features a concentric mandrel and suspension element, which uses the same gas-lift valve used in a side bag mandrel. The application of the invention is proposed for wells with very low static pressure that operate with an intermittent pneumatic lift, enabling the production in these wells. The development of a concentric mandrel and the respective macaroni suspension element (1), allows the use of an insertable accumulation chamber, and at the same time allows the replacement of the gas-lift valve to be carried out with a wire unit, thus avoiding rig interventions, which are more expensive and time consuming.

Claims

1. CONCENTRIC MANDREL FOR INTERMITTENT PNEUMATIC LIFTING WITH ACCUMULATION CHAMBER, characterized by: comprised of a concentric nipple (8) for the gas-lift valve (5) and a suspension element nipple (3) for the pipe column (1). and a nipple suspension element (3) to be installed in the production column just above the plug (16) and attached to the concentric mandrel (8) and support the macaroni tubing (1), which is installed just below the concentric mandrel (8).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be described in more detail below, with reference to the attached figures which, in a schematic and non-limiting way, represent examples of the configuration thereof. The drawings include:

[0011] FIG. 1 illustrates the concentric mandrel with pneumatic lift valve installed.

[0012] FIG. 2 illustrates a well equipped with an insertable chamber with a concentric mandrel.

[0013] FIG. 3 illustrates the suspender nipple of the macaroni tubing.

[0014] FIG. 4 illustrates a sectional view of the concentric mandrel.

DETAILED DESCRIPTION OF THE INVENTION

[0015] An innovative design of concentric mandrel (8) and suspension element (3) was developed, which uses the same gas-lift valve (5) used in the side bag mandrel. The mandrel (8) is installed in the production column just above the plug (16) and couples to the macaroni tubing suspension element (3) (1) which is installed just below the concentric mandrel (8). The macaroni tubing (1) is a production tube, usually of small diameter, and extends well below the plug (16), below which the accumulation chamber (14) is installed, consisting of large diameter production tubes (4), to accumulate the liquid slug. The foot valve (15) is installed at the end of this accumulation chamber (14). The development of the concentric mandrel allows the use of an accumulation chamber in an innovative manner and with higher operational reliability

[0016] The suspension element (3) is lowered together with the macaroni tubing (1) during the rig intervention, being installed in the recess of the pipe sleeve (2) with an NU or EU thread. The concentric mandrel (8) is attached just above the suspension element (3) and fits into it when the connection is screwed on.

[0017] The bottom assembly has the following elements: concentric nipple (mandrel) (8) for 1.1/2-inch gas lift valve (5) and Nipple suspension element (3) for 1.315-inch NU pipe column (12).

[0018] -Figure 1 illustrates the concentric mandrel (8) with gas-lift valve (5) installed. The annular gas inlet (13) occurs from the side (6) and the outlet from below.

[0019] FIG. 2 illustrates a well equipped with an insertable chamber (14) with a concentric mandrel (8). The flow of gas passing through the pneumatic lift valve (20) pushes the liquid initially passing through the concentric mandrel itself (8) and (22) and then rises to the surface.

[0020] FIG. 3 illustrates the nipple suspension element(3) of the macaroni tubing (1) that is installed below the concentric mandrel (8). In addition to supporting the weight of the macaroni tubing (1), this suspension element (3) has an upper seal that couples to the mandrel and has side holes (21) to allow the passage of liquids and gas during the lifting phase.

[0021] FIG. 4 illustrates a sectional view of the concentric mandrel. The gas-lift valve (5) is housed in the center and the passage of liquid and gas occurs during the ascent in the peripheral annulus (21);