Internal debugging and pressure matching tools

Abstract

The invention relates to an internal debugging and constant pressure production matching tool, comprising an upper joint, an adjusting nut, an upper center tube, a main body, a lower center tube, a spacer, a spring, a piston, a core sleeve and a lower joint; a gasket is provided at the lower end of the upper center tube, the spring is sleeved on the lower end of the lower center tube and placed between the gasket and the piston; a liquid inlet hole A is provided on the upper center tube, a shear ring is provided between the upper center tube and the main body, and the shear ring main body closes the liquid inlet hole A; a retaining spring is provided on the shear ring; a liquid inlet hole C is provided at the lower end of the main body, and a liquid inlet hole B is provided on the lower joint; an oil drain hole is provided at the front end of the piston, and a steel ball is provided in the oil drain hole; the device can set the tool opening pressure according to different formation pressures to control the liquid production, and a high water content and high liquid production layer adopts a correspondingly higher opening pressure to control production, amplify the production pressure difference of the thin differential layer, and improve the liquid supply capacity of the thin differential layer.

Description

Technical Field

[0001] The invention relates to the field of oil field development, and in particular to an internal debugging and constant pressure production matching tool. Background Art

[0002] As oilfield development enters the medium-to-high water content stage, conflicts between oil layers are becoming increasingly prominent. Production allocation technology is one of the important means to stabilize oil production and reduce water content. At present, only water blocking measures for high permeability layers and high water content layers are applied in stratified oil production. However, as the production effect deteriorates year by year, the liquid production volume increases, causing interlayer interference in the low permeability layer. Therefore, the existing production allocation tools cannot guarantee stratified pressure control and cannot meet the needs of reasonable oil well production. Summary of the invention

[0003] In order to make up for the shortcomings of the above-mentioned prior art, the purpose of the present invention is to propose an internally debugged constant pressure production matching tool, which controls the liquid production by setting the tool opening pressure according to different formation pressures. The high water content and high liquid production layer adopts a corresponding higher opening pressure to control production, amplify the production pressure difference of thin differential layers, and improve the liquid supply capacity of thin differential layers.

[0004] The objective of the present invention is achieved through the following technical scheme: an internal debugging and constant pressure production matching tool comprises an upper joint, an adjusting nut, an upper center tube, a main body, a lower center tube, a spacer, a spring, a piston, a core sleeve, and a lower joint; the upper and lower ends of the main body are respectively threadedly connected with the upper joint and the lower joint, the adjusting nut, the upper center tube, the lower center tube, the spacer, the spring, the piston, and the core sleeve are all placed inside the main body, the lower end of the adjusting nut is threadedly connected with the upper center tube, and the lower end of the upper center tube is threadedly connected with the lower center tube; the lower end of the lower center tube is threadedly connected with the core sleeve and the lower joint; the upper end of the piston is sleeved with the sleeve of the lower center tube and slidably connected, and the lower end of the piston is sleeved with the core sleeve and slidably connected; the technical key points are: a gasket is provided at the lower end of the upper center tube, the spring is sleeved on the lower end of the lower center tube and placed between the gasket and the piston; the spacer main body is sleeved with the spring, and the upper and lower ends of the spacer are respectively sleeved with the lower end of the upper center tube and the front end of the piston and slidably connected;

[0005] The upper center tube is provided with a liquid inlet hole A, a shear ring is provided between the upper center tube and the main body, the inner hole of the main body is provided with a step, and the upper end of the main body is provided with an outer hole; the inner hole of the shear ring cooperates with the upper center tube and is fixed to the upper center tube by shear nails; the shear ring main body closes the liquid inlet hole A; the shear ring is provided with a retaining ring; the lower end of the main body is provided with a liquid inlet hole C, and the lower joint is provided with a liquid inlet hole B; the front end of the piston is provided with an oil drain hole, and a steel ball is provided in the oil drain hole;

[0006] The lower end of the piston is provided with an arc surface, the inner hole at the upper end of the lower joint is provided with an inclined surface, and the arc surface at the lower end of the piston contacts the chamfered line of the inclined surface at the upper end of the lower joint to form a hard seal.

[0007] Beneficial effects of the present invention:

[0008] (1) The liquid production can be controlled by setting the tool opening pressure according to different formation pressures. The high water content and high liquid production layer adopts a correspondingly higher opening pressure to control production, thereby amplifying the production pressure difference of the thin differential layer and improving the liquid supply capacity of the thin differential layer.

[0009] (2) The opening pressure can be adjusted according to different formation pressures without disassembly and installation; when going down the well, the internal shear ring 5 closes the liquid inlet hole A to achieve environmentally friendly construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the internal debugging and constant pressure matching and production supporting tool;

[0011] Figure 2 It is a schematic diagram of the connection structure between the shear ring and the upper center pipe;

[0012] Figure 3 It is a partial structural diagram of the internal debugging and constant pressure matching and production supporting tools;

[0013] Figure 4 It is a schematic diagram of the connection structure between the piston and the lower joint.

[0014] Figure 1-Figure 4 The specific names of the structures are: upper joint 1, adjusting nut 2, upper center tube 3, main body 4, step 4-1, outer hole 4-2, shear ring 5, retaining ring groove 5-1, retaining ring 6, shear pin 7, lower center tube 8, gasket 9, spacer 10, spring 11, steel ball 12, piston 13, arc surface 13-1, core sleeve 14, lower joint 15, inclined surface 15-1, liquid inlet hole A 16, liquid inlet hole B 17, liquid inlet hole C 18, oil drain hole 19. DETAILED DESCRIPTION

[0015] See Figure 1 - 4. The specific structure of this embodiment is a kind of internal debugging and constant pressure matching tool, including an upper joint 1, an adjusting nut 2, an upper center tube 3, a main body 4, a lower center tube 8, a spacer sleeve 10, a spring 11, a piston 13, a core sleeve 14, and a lower joint 15; the internal threads at the upper and lower ends of the main body 4 are respectively connected with the external threads of the upper joint 1 and the lower joint 15, the adjusting nut 2, the upper center tube 3, the lower center tube 8, the spacer sleeve 10, the spring 11, the piston 13, and the core sleeve 14 are all placed inside the main body 4, the lower end of the adjusting nut 2 is connected with the internal thread of the upper center tube 3, the lower end internal thread of the upper center tube 3 is connected with the external thread of the upper end of the lower center tube 8; the lower end external thread of the lower center tube 8 is connected with the core sleeve 14 and the internal thread of the lower joint 15; the upper end of the piston 13 is sleeved on the lower center tube 8 and slidably connected, and the lower end of the piston 13 is sleeved on the core sleeve 14 and slidably connected;

[0016] The lower end of the upper center tube 3 is provided with a gasket 9, and the spring 11 is sleeved on the lower end of the lower center tube 08 and placed between the gasket 9 and the piston 13; the main body of the spacer 10 is sleeved with the spring, and the upper and lower ends of the spacer 10 are respectively sleeved on the lower end of the upper center tube 3 and the front end of the piston 13 and are slidably connected;

[0017] The upper center tube 3 is provided with a liquid inlet hole A16, a shear ring 5 is provided between the upper center tube 3 and the main body 4, the inner hole of the main body 4 is provided with a step 4-1, and the upper end of the main body 4 is provided with an outer hole 4-2; the inner hole of the shear ring 5 cooperates with the upper center tube 3 and is fixed on the upper center tube 3 by a shear nail 7; the main body of the shear ring 5 closes the liquid inlet hole A16; the shear ring 5 is provided with a retaining ring groove 5-1, and a retaining ring 6 is provided in the retaining ring groove 5-1; the lower end of the main body 4 is provided with a liquid inlet hole C18, and the lower joint 15 is provided with a liquid inlet hole B17; the front end of the piston 13 is provided with an oil drain hole 19, and the oil drain hole 19 is provided with a steel ball 12;

[0018] The piston 13 has an arc surface 13-1 at the lower end, and the inner hole at the upper end of the lower joint 15 has an inclined surface 15-1. The arc surface 13-1 at the lower end of the piston 13 and the chamfered line of the inclined surface 15-1 at the upper end of the lower joint are in contact to form a hard seal.

[0019] The structural features of the present invention are:

[0020] The main body 4 of the internal debugging constant pressure matching tool is connected with the internal thread upper joint 1 and the lower joint 15 by external thread, and the lower center tube 8 is connected with the internal thread of the lower joint 15 and the core sleeve 14 by external thread, and matches with the inner hole of the piston 13. The steel ball 12 is built into the inner hole of the piston 13, and the spring 11 is sleeved on the lower end face of the lower center tube 8 and contacts the piston 13. The inner hole of the spacer 10 matches with the piston 13, and the gasket 9 is placed on the upper part of the spring 11. The upper center tube 3 is threadedly connected with the lower center tube 3, and the inner hole of the shear ring 5 matches with the upper center tube 3 and is fixed on the upper center tube through the shear nail 7, and the retaining ring 6 is embedded in the shear ring 5. The external thread of the adjusting nut 2 matches with the internal thread of the upper center tube 3.

[0021] Working principle of the present invention:

[0022] 1. When the tool is lowered into the well, the shear ring 5 closes the liquid inlet A16 on the upper central pipe 3, so that the external well fluid cannot enter the tool from the liquid inlet holes B and C. At this time, the tool plays a role in preventing blowout.

[0023] 2. After the tool reaches the designed depth, the oil pipe is pressurized to cut the shear pin 7 when the packer is released. The shear ring 5 moves upward under the pressure, and the embedded retaining ring 6 is stuck on the step 4-1 in the main body 4 to prevent the shear ring 5 from moving downward to close the liquid inlet A16. On the ground, according to the pressure of different layers, the preload force of the spring 11 is adjusted by rotating the adjustment nut 2.

[0024] 3. On site, by rotating the adjusting nut 2, the upper center tube 3 is driven to compress the spring 11 and adjust the spring preload. There is no need to disassemble, add or reduce gaskets in the tool workshop to adjust the pressure and achieve the purpose of stratified production.

[0025] 4. After the spacer 10 covers the spring 11, lubricating oil is injected into the interior to protect the spring 11 from being corroded by the well fluid. After the spring 11 is compressed, the upper oil drain hole 19 of the piston 13 can drain the lubricating oil from the upper end, and the internal steel ball 12 is equivalent to a one-way valve to prevent external well fluid from entering.

[0026] 5. The piston 13 and the lower joint 15 realize line sealing, that is, hard sealing, to prevent the O-shaped rubber sealing ring, Gley ring and other soft seals from damaging the sealing elements and affecting the sealing effect due to the well fluid temperature and reciprocating motion.

[0027] 6. The inlet channel formed by the intersection of the inlet hole B17 and the inlet hole C18 pushes the piston 13 upward to prevent sand accumulation and blockage of the inlet channel. After the well fluid enters from the inlet holes B and C, the pressure acts on the piston 13. When the pressure is greater than the preload force of the spring 11, the piston 13 moves upward and the well fluid enters the tool to achieve the purpose of production allocation.

[0028] 7. The outer hole 4-2 at the upper end of the main body 4 serves to exhaust air when the shear ring 5 moves upward, and at the same time can balance the internal and external pressure difference to ensure that the shear ring 5 does not move upward prematurely.

Claims

1. A tool for internal debugging and constant pressure production matching, comprising an upper joint, an adjusting nut, an upper center tube, a main body, a lower center tube, a spacer, a spring, a piston, a core sleeve, and a lower joint; the lower end of the adjusting nut is threadedly connected to the upper center tube, the lower end of the upper center tube is threadedly connected to the lower center tube; the lower end of the lower center tube is threadedly connected to the core sleeve and the lower joint; the upper end of the piston is sleeved with the lower center tube and slidably connected, and the lower end of the piston is sleeved with the core sleeve and slidably connected; its characteristics are: The lower end of the upper center tube is provided with a gasket, and the spring is sleeved on the lower end of the lower center tube and placed between the gasket and the piston; the main body of the spacer sleeve is sleeved with the spring, and the upper and lower ends of the spacer sleeve are respectively sleeved on the lower end of the upper center tube and the front end of the piston and are slidably connected; The upper center tube is provided with a liquid inlet hole A, a shear ring is provided between the upper center tube and the main body, the inner hole of the main body is provided with a step, and the upper end of the main body is provided with an outer hole; the inner hole of the shear ring cooperates with the upper center tube and is fixed to the upper center tube by shear nails; the shear ring closes the liquid inlet hole A; the shear ring is provided with a retaining ring; the lower end of the main body is provided with a liquid inlet hole C, and the lower joint is provided with a liquid inlet hole B; the front end of the piston is provided with an oil drain hole, and a steel ball is provided in the oil drain hole; The lower end of the piston is provided with an arc surface, the inner hole at the upper end of the lower joint is provided with an inclined surface, and the arc surface at the lower end of the piston contacts the chamfered line of the inclined surface at the upper end of the lower joint to form a hard seal; After the spacer covers the spring, lubricating oil is injected into the interior to protect the spring from being corroded by well fluid. After the spring is compressed, the oil drain hole on the piston can drain the lubricating oil from the upper end. The steel ball inside is equivalent to a one-way valve to prevent external well fluid from entering. The liquid inlet channel formed by the intersection of the liquid inlet hole B and the liquid inlet hole C pushes the piston upward to prevent sand accumulation.

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