CN105909205A - Novel active hydraulic control packer - Google Patents

Abstract

The invention discloses a new type of active hydraulic control packer. The mandrel is further provided with a pushing hydraulic cylinder, an actuating hydraulic cylinder and a power hydraulic cylinder which are threadedly connected to each other in sequence, and the oil supply end of the axial plunger pump. Connected to the right chamber of the power hydraulic cylinder, the mandrel is provided with oil passage I, oil passage II, oil passage III and oil passage IV. The above four oil passages are respectively equipped with electromagnetic valves controlled by the controller to open and close them. The power hydraulic cylinder The left chamber is connected to the left chamber of the actuating hydraulic cylinder through the oil passage Ⅰ, the right chamber of the actuating hydraulic cylinder is connected to the vacuum chamber of the pushing hydraulic cylinder through the oil passage Ⅱ, and the left chamber of the power hydraulic cylinder is connected to the right chamber of the actuating hydraulic cylinder through the oil passage Ⅲ. The left chamber of the cylinder is connected to the vacuum chamber of the push hydraulic cylinder through the oil passage IV; the present invention includes a multi-cylinder combined drive module, a pump valve integration module, mandrel oil passage and vacuum chamber settings, etc., thereby reducing the complexity of the packer, Improve the reliability of the system.

Description

A New Type of Active Hydraulically Controlled Packer

technical field

The invention relates to a downhole oil layer protection packer, in particular to an active hydraulic control packer capable of isolating the production layer of the oil pipe string and protecting the casing under the harsh working environment of high temperature and high pressure in oil production engineering .

Background technique

The packer is a downhole tool that separates different oil layers and water layers in the wellbore and withstands a certain pressure difference. It satisfies the requirements of the oil production process, and can be lowered to the predetermined position of the wellbore, tightly sealed, and durable in the downhole.

Due to the current lack of oil resources, the depth of oil extraction is gradually deepening, which makes the difficulty of extraction increase, and the mining environment is getting worse and worse, so the technical requirements for the structure and performance of the packer are getting higher and higher. Most of the existing hydraulic control packers have the following problems in actual work: the process is cumbersome and cannot be recycled many times, which seriously affects the working time and efficiency and increases the cost; due to the hydraulic drive system of the hydraulic control packer, There are many reliability links, complex structure, and poor modularization, which make maintenance and installation difficult, and it is difficult to ensure the reliability of working in a deep well environment with high temperature and high pressure, which may easily cause the packer to fail or be scrapped during the working process, thus affecting the packer normal work.

Contents of the invention

The object of the present invention is to propose a new type of active hydraulic control packer, which includes multi-cylinder Combined drive module, pump valve integration module, mandrel oil channel and vacuum chamber setting, etc., thus reducing the complexity of the packer and improving the reliability of the system.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a new type of active hydraulic control packer, including: a fixed mandrel, the mandrel is sleeved with an upper joint and a lower joint, one end of the upper joint and the lower joint One end of the joint is in close contact and the outer side of the upper joint and the lower joint are threaded through the sleeve ring, and the inner side of the upper joint and the lower joint is threaded with the mandrel through the balance sleeve; there is also a connecting block on the mandrel, and one end of the connecting block is connected The other end of the lower joint is threaded;

The mandrel is also provided with a push hydraulic cylinder, an action hydraulic cylinder and a power hydraulic cylinder in sequence. The above three and the mandrel are in clearance fit. One end of the power hydraulic cylinder and one end of the action hydraulic cylinder, and the action hydraulic cylinder The other end of the cylinder and one end of the pushing hydraulic cylinder are connected by double threads; the mandrel is also sleeved with a pressing block, the other end of the pushing hydraulic cylinder is connected with the pressing block by double threads, and there is a glue between the connecting block and the pressing block. cylinder;

The cylinder barrel of the power hydraulic cylinder is provided with a floating piston, the other end of the power hydraulic cylinder is connected with a protective cover, and a hydraulic integrated block is arranged in the protective cover, and the hydraulic integrated block and the mandrel and the hydraulic integrated block and the protective cover are all threaded. The hydraulic manifold is equipped with a motor, a reducer, an axial piston pump and a solenoid valve;

The oil supply end of the axial piston pump is connected to the right chamber of the power hydraulic cylinder through the oil passage on the hydraulic manifold and the oil passage on the mandrel in turn. The mandrel is provided with oil passage I, oil The solenoid valve b, solenoid valve c, solenoid valve d, Solenoid valve a, the mandrel is equipped with an electromagnetic plug and a power interface for supplying power to the above solenoid valve. The left chamber of the power hydraulic cylinder is connected to the left chamber of the action hydraulic cylinder through the oil circuit I, and the right chamber of the action hydraulic cylinder is connected to the left chamber of the action hydraulic cylinder through the oil circuit II. Push the vacuum chamber of the hydraulic cylinder, the left chamber of the power hydraulic cylinder is connected to the right chamber of the action hydraulic cylinder through the oil passage III, and the left chamber of the action hydraulic cylinder is connected to the vacuum chamber of the push hydraulic cylinder through the oil passage IV;

In the state of opening solenoid valve b and solenoid valve c and closing solenoid valve a and solenoid valve d at the same time, the floating piston and each hydraulic cylinder barrel move in the same direction at the same time, and the displacement of the floating piston at the same time is the displacement of the hydraulic cylinder barrel Two times, and then the oil in the left chamber of the power hydraulic cylinder is squeezed to generate pressure, and the oil enters the left chamber of the action hydraulic cylinder, pushing the hydraulic cylinder to drive the pressing block to move to the left to squeeze the rubber tube, and complete the setting seal.

As a further improvement, an inner bracket is sheathed on the mandrel, the inner bracket is screwed to the hydraulic manifold, and the axial piston pump is installed on the inner bracket.

As a further improvement, the inner chamber of the pushing hydraulic cylinder is a vacuum chamber structure.

As a further improvement, an O-ring end face seal is used between the actuating hydraulic cylinder and the pushing hydraulic cylinder, and between the pushing hydraulic cylinder and the pressing block.

As a further improvement, a threaded connection is used between the protective cover and the upper joint.

As a further improvement, the connecting block and the mandrel are screwed together.

As a further improvement, the balance sleeve and the inner support are screwed together.

As a further improvement, O-rings are also used for sealing between the multiple groups of hydraulic cylinders and the mandrel, and between the floating piston and the inner wall of the power hydraulic cylinder.

As a further improvement, an O-ring is used for end face sealing between the axial piston pump and the inner bracket.

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention is a multi-cylinder combined drive, which has the advantages of convenient machining, low manufacturing cost, easy maintenance and multiple recycling;

2. Multiple sets of hydraulic cylinders of the present invention are connected by double threads, and O-ring end faces are used for sealing, so as to ensure the sealing performance between hydraulic cylinders;

3. In the whole working process of the present invention, the load suffered by pushing the hydraulic cylinder is finally transmitted to the connecting threads of multiple groups of hydraulic cylinders, and the shells of multiple hydraulic cylinders are also the final load-bearing parts, and the shells act as push rods to play a role. purpose of structural simplification;

4. Since the overall structure of the packer is required to be compact, in order to save space and install various hydraulic components, a special hydraulic manifold is designed to facilitate installation and debugging;

5. The oil circuit design on the hydraulic manifold and the mandrel allows the hydraulic oil to directly enter the right chamber of the power hydraulic cylinder of the packer to push the floating piston to work, which can improve the working efficiency of setting and unsealing, and shorten the working time;

6. Promote the structural design of the vacuum chamber of the hydraulic cylinder, which can improve the oil return efficiency of setting and unsealing.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the working principle of the present invention.

Figure 3 is a schematic diagram of the working principle of the setting process.

Fig. 4 is a schematic diagram of the working principle of the unsealing process.

Marks in the figure: 1. Upper joint, 2. Balance sleeve, 3. Sleeve ring, 4. Lower joint, 5. Connection block, 6. Rubber tube, 7. Press block, 8. Push hydraulic cylinder, 801, Push Hydraulic cylinder vacuum chamber, 9, mandrel, 10, action hydraulic cylinder, 1001, left cavity of action hydraulic cylinder, 1002, right cavity of action hydraulic cylinder, 11, floating piston, 12, hydraulic manifold, 13, solenoid valve, 14, Inner bracket, 15, reducer, 16, motor, 17, electromagnetic plug, 18, power supply interface, 19, axial piston pump, 20, protective cover, 21, power hydraulic cylinder, 2101, right chamber of power hydraulic cylinder, 2102 , Power hydraulic cylinder left cavity.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, a new type of active hydraulic control packer includes a fixed mandrel 9, on which an upper joint 1 and a lower joint 4 are sleeved, and one end of the upper joint 1 and the lower joint 4 One end is in close contact and the outer side of the upper joint 1 and the lower joint 4 is threaded through the sleeve ring 3, and the inner side of the upper joint 1 and the lower joint 4 is threaded with the mandrel 9 through the balance sleeve 2; the mandrel 9 is also provided with A connecting block 5, one end of the connecting block 5 is threadedly connected with the other end of the lower joint 4, and the connecting block 5 and the mandrel 9 are threadedly connected.

The mandrel 9 is also sequentially provided with a push hydraulic cylinder 8 , an action hydraulic cylinder 10 and a power hydraulic cylinder 21 , all of which are in clearance fit with the mandrel 9 . The present invention is composed of multiple groups of hydraulic cylinders. If the multiple groups of hydraulic cylinders are designed into an integral structure, internal links will be reduced, and the reliability of the design can be improved to a certain extent. However, considering factors such as machining difficulty and manufacturing cost, multiple groups of hydraulic cylinders are designed separately, one end of the power hydraulic cylinder 21 and one end of the action hydraulic cylinder 10, and the other end of the action hydraulic cylinder 10 and the push hydraulic cylinder 8 One end of each adopts double-thread connection; the mandrel 9 is also sleeved with a pressure block 7, and the other end of the push hydraulic cylinder 8 is connected with the pressure block 7 by double threads, and a rubber tube 6 is arranged between the connection block 5 and the pressure block 7 ;

Both the action hydraulic cylinder 10 and the push hydraulic cylinder 8 as well as between the push hydraulic cylinder 8 and the briquetting block 7 adopt O-ring end face seals. The inner cavity of the hydraulic cylinder 8 is a vacuum chamber structure.

A floating piston 11 is arranged in the cylinder barrel of the power hydraulic cylinder 21 , and a protective cover 20 is connected to the other end of the power hydraulic cylinder 21 . Since the overall structure of the packer is required to be compact, in order to save space and install various hydraulic components, a special hydraulic manifold is designed for easy installation and debugging. 9 are connected by threads. The hydraulic manifold 12 is equipped with a motor 16, a reducer 15, an axial piston pump 19 and a solenoid valve 13. The protective cover 20 is threaded to one end of the upper joint 1 of another packer. The protective cover 20 is connected with the hydraulic manifold 12 through threads to play an isolation role, thereby ensuring that the solenoid valve and control lines are not disturbed by the harsh external environment.

There are five line pipes and four oil passages on the mandrel 9, which are equiangularly distributed along the circumference of the mandrel. On the hydraulic manifold 12, five line pipes and four oil outlets are designed corresponding to the mandrel 9. The hydraulic system adopts an integral oil tank, and the hydraulic oil filled in the casing acts as an oil tank. The hydraulic oil output by the axial piston pump 19 controls each oil circuit through four solenoid valves.

The power hydraulic cylinder left cavity 2102 has a hole C, the action hydraulic cylinder left cavity 1001 has a B hole, the action hydraulic cylinder right cavity 1002 has a F hole, the push hydraulic cylinder vacuum cavity 801 has an E hole, and the power hydraulic cylinder left cavity 2102 is provided with a G hole, the push hydraulic cylinder vacuum chamber 801 is provided with an A hole, and the power hydraulic cylinder right chamber 2101 is provided with a D hole for hydraulic oil to enter.

The oil supply end of the axial plunger pump 19 is connected to the right chamber 2101 of the power hydraulic cylinder through the oil passage on the hydraulic manifold 12 and the oil passage on the mandrel 9 in turn, and the mandrel 9 is provided with a Oil circuit Ⅰ, oil circuit Ⅱ, oil circuit Ⅲ and oil circuit Ⅳ, oil circuit Ⅰ, oil circuit Ⅱ, oil circuit Ⅲ and oil circuit Ⅳ are respectively equipped with solenoid valve b and solenoid valve c controlled by the controller to open and close , solenoid valve d, solenoid valve a, the mandrel 9 is equipped with an electromagnetic plug 17 and a power interface 18 for supplying power to the above solenoid valve, the left chamber 2102 of the power hydraulic cylinder is connected to the left chamber 1001 of the action hydraulic cylinder through the oil circuit I, and the action The right chamber 1002 of the hydraulic cylinder is connected to the vacuum chamber 801 of the push hydraulic cylinder through the oil passage II, the left chamber 2102 of the power hydraulic cylinder is connected to the right chamber 1002 of the action hydraulic cylinder through the oil passage III, and the left chamber 1001 of the action hydraulic cylinder is connected to the push cylinder through the oil passage IV. Hydraulic cylinder vacuum chamber 801;

The mandrel 9 is also sleeved with an inner bracket 14, the inner bracket 14 is threadedly connected with the hydraulic manifold 12, the axial piston pump 19 is installed on the inner bracket 14, and an O Ring for face sealing. Both the balance sleeve 2 and the mandrel 9, and the balance sleeve 2 and the inner support 14 are connected by threads.

Its working principle is:

After starting to set, in the state of opening solenoid valve b and solenoid valve c and closing solenoid valve a and solenoid valve d at the same time, floating piston 11 and each hydraulic cylinder barrel move in the same direction at the same time, and the displacement of floating piston 11 at the same time It is twice the displacement of the hydraulic cylinder, that is, the moving speed of the floating piston 11 is twice the moving speed of the cylinder, and then the oil in the left chamber 2102 of the power hydraulic cylinder is squeezed to generate pressure, and the oil enters the action hydraulic pressure. In the cylinder left chamber 1001, push the hydraulic cylinder 8 to drive the pressure block 7 to move to the left to extrude the rubber tube 6 to complete the setting. This process promotes the load of the hydraulic cylinder 8 to finally be transmitted to the connecting threads of multiple groups of hydraulic cylinders, and the casings of the multiple groups of hydraulic cylinders themselves are also final load-bearing components, and the casings act as push rods.

After the start of unsealing, when solenoid valve a and solenoid valve d are opened and solenoid valve b and solenoid valve c are closed at the same time, the left chamber 2102 of the power hydraulic cylinder communicates with the right chamber 1002 of the action hydraulic cylinder and the pressures of the two chambers are equal, and the hydraulic pressure The oil pushes the right chamber 2101 of the power hydraulic cylinder to drive the entire outer cylinder to unseal, the displacement of the floating piston 11 is approximately 0, the outer cylinder drives the pressing block 7 to move to the right, and the rubber tube 6 recovers to complete the unseal.

O-rings are also used for sealing between multiple sets of hydraulic cylinders and the mandrel 9, and between the floating piston 11 and the inner wall of the power hydraulic cylinder 21. Considering that the oil temperature of the hydraulic oil where the sealing ring is located will cause the rubber to expand to a certain extent, the change of the oil temperature will not only change the expansion coefficient, but also the elastic mold of the rubber will also change. Therefore, the present invention selects according to the analysis of actual working conditions. Viton rubber is suitable for petrochemical industry, oil-resistant and aging-resistant, and is the best choice for sealing rings used in petroleum packers.

As shown in Figure 3, assuming that the floating piston moves x1 relative to the mandrel, the power hydraulic cylinder moves x2 relative to the mandrel, the final displacement of the tool end is x3, and the area of the oil chamber is A.

When setting the seal, the floating piston and the power hydraulic cylinder both move. Assuming that the direction of movement of both is downward, the two move at different speeds, so that the oil will be squeezed to generate flow. The flow Q of the oil is: Q =(x1-x2)*A, the flow extruded by this part enters the left chamber 1001 of the action hydraulic cylinder and pushes the outer cylinder to move downward, so: Q= x3*A

Simultaneous two formulas can be obtained

(x1-x2)*A=x3*A

i.e. x1-x2= x3 x1 = x3+x2

Because the cylinder as a whole is rigidly connected, there are

x2=x3

That is, x1=2x2=2x3

From the above calculation results, the displacement of the piston is twice the displacement of the outer cylinder.

As shown in Figure 4, assuming that the floating piston moves x1 relative to the mandrel, the power hydraulic cylinder moves x2 relative to the mandrel, the final displacement of the tool end is x3, and the area of the oil chamber is A. During the unsealing movement, it is assumed that the floating piston moves downward relative to the mandrel, and the power hydraulic cylinder moves upward, so that the oil is squeezed to generate flow. The flow Q of the oil is: Q=(x1+x2)*A, this part squeezes The extruded flow enters the right chamber 1002 of the action hydraulic cylinder to drive the outer cylinder to move upward, so there are:

Q=x3*A

Combine the two formulas to get "

(x1+x2)*A=x3*A

i.e. x1+x2= x3 x1 = x3-x2

Because the cylinder as a whole is rigidly connected, there are:

x2=x3

That is, x1=0, the piston is in a static state relative to the mandrel during the unsealing process, and the power comes from the power area on the floating piston connected to the ambient pressure.

From the above calculation results, it can be seen that the displacement of the piston is approximately 0, and the external cylinder moves.

Claims (9)

1. a New Active hydraulic control packer, including: the mandrel (9) being fixedly installed, mandrel (9) is arranged with top connection (1) With lower contact (4), top connection (1) one end and lower contact (4) one end are in close contact and top connection (1) and the outside of lower contact (4) Threaded by liner ring (3), the inner side of top connection (1) and lower contact (4) is by balancing sleeve (2) and mandrel (9) screw thread Connect；Being additionally provided with contiguous block (5) on mandrel (9), threadeds with the other end of lower contact (4) in one end of contiguous block (5), and it is special Levy and be:

Promotion hydraulic cylinder (8), action hydraulic cylinder (10) and power hydraulic cylinder (21) also it has been sequentially arranged on described mandrel (9), on State and between three and mandrel (9), be matched in clearance, described power hydraulic cylinder (21) one end and action hydraulic cylinder (10) one end, with And the other end of action hydraulic cylinder (10) all uses double thread to be connected with the one end promoting hydraulic cylinder (8)；Mandrel (9) is upper the most sheathed There is briquetting (7), promote the other end of hydraulic cylinder (8) to use double thread to be connected, between contiguous block (5) and briquetting (7) with briquetting (7) It is provided with packing element (6)；

Being provided with floating piston (11) in the cylinder barrel of described power hydraulic cylinder (21), power hydraulic cylinder (21) other end connects protection Cover (20), is provided with hydraulic manifold block (12), hydraulic manifold block (12) and mandrel (9) and hydraulic manifold block in protective cover (20) (12) all threaded with protective cover (20), hydraulic manifold block (12) is equiped with motor (16), decelerator (15), axial plunger Pump (19) and electromagnetic valve (13)；

The fuel feeding end of described axial plunger pump (19) passes sequentially through the oil circuit on hydraulic manifold block (12) and is opened on mandrel (9) Oil communication to the right chamber of power hydraulic cylinder (2101), described mandrel (9) offers oil circuit I, oil circuit II, oil circuit III and oil Road IV, oil circuit I, oil circuit II, oil circuit III and oil circuit IV is respectively arranged with and is controlled, by controller, electromagnetic valve b, the electromagnetism that it opens and closes Valve c, electromagnetic valve d, electromagnetic valve a, mandrel (9) is provided with for connecing to the electromagnetism plug (17) of above-mentioned solenoid valve and power supply Mouth (18), the left chamber of power hydraulic cylinder (2102) is communicated to the left chamber of action hydraulic cylinder (1001), the right chamber of action hydraulic cylinder by oil circuit I (1002) being communicated to promote hydraulic cylinder vacuum chamber (801) by oil circuit II, the left chamber of power hydraulic cylinder (2102) is by oil circuit III even Passing to the right chamber of action hydraulic cylinder (1002), the left chamber of action hydraulic cylinder (1001) is communicated to promote hydraulic cylinder vacuum chamber by oil circuit IV (801)；

When opening electromagnetic valve b and electromagnetic valve c and simultaneously closing off electromagnetic valve a and electromagnetic valve d, floating piston (11) and each Individual Barrel of Hydraulic Cylinders moves simultaneously in the same direction, the twice that displacement is Barrel of Hydraulic Cylinders displacement of floating piston (11) under the same time, And then the fluid in the left chamber of power hydraulic cylinder (2102) is squeezed generation pressure, the fluid left chamber of entrance action hydraulic cylinder (1001) In, promote hydraulic cylinder (8) to drive briquetting (7) to left movement with extruding packing element (6), complete to set.

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described mandrel also overlaps on (9) Being provided with inner support (14), inner support (14) and hydraulic manifold block (12) thread connection, axial plunger pump (19) is arranged on inner support (14) on.

A kind of New Active hydraulic control packer the most according to claim 1 and 2, it is characterised in that: described promotion hydraulic cylinder (8) inner chamber is vacuum chamber structure.

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described action hydraulic cylinder (10) And promote and all use O end face seal between hydraulic cylinder (8) and promotion hydraulic cylinder (8) and briquetting (7).

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described protective cover (20) is with upper Use threaded between joint (1).

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described contiguous block (5) and core Axle (9) uses threaded.

A kind of New Active hydraulic control packer the most according to claim 2, it is characterised in that: described balancing sleeve (2) with Inner support (14) uses threaded.

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described many group hydraulic cylinders and core Between axle (9), and O is also selected to seal between floating piston (11) and power hydraulic cylinder (21) inwall.

A kind of New Active hydraulic control packer the most according to claim 1, it is characterised in that: described axial plunger pump (19) And use O to carry out end face seal between inner support (14).