Single-stage hydraulic cylinder driving oil extraction device

Abstract

The utility model provides a single-stage hydraulic cylinder driving oil extraction device. The single-stage hydraulic cylinder driving oil extraction device comprises an upper connector, an upper hydraulic cylinder, an upper plunger, an upper pump cavity, a partition reversing valve, a lower pump cavity, a lower plunger, a lower hydraulic cylinder and a lower connector which are sequentially connected. Wherein the upper hydraulic cylinder and the lower hydraulic cylinder are combined into a single-stage hydraulic cylinder; the single-stage hydraulic cylinder drives the upper pump cavity and the lower pump cavity to work through the upper plunger and the lower plunger. The single-stage hydraulic cylinder drives the upper pump cavity and the lower pump cavity to work, the hydraulic cylinder working face S cylinder and the pump lifting working face S pump are two end faces of the same piston, the piston connecting rod factor is removed, and the hydraulic cylinder working area S cylinder is far larger than the S pump, namely SCylinder-S0; s0 is the lifting area of the pump, so that the working pressure of the ground pump is small, and the problem of high-pressure lifting of the hydraulic piston pump is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production, in particular to a single-stage hydraulic cylinder driven oil production device. Background Art

[0002] The hydraulically driven rodless oil production equipment currently used in the market cannot be used for oil production or drainage in ultra-deep wells, especially for ultra-deep horizontal wells, offshore platform wells, severely casing-changed wells and special oil wells on land. The well depth reaches more than 4,500 meters, which can basically not be completed by the current oil production lifting equipment.

[0003] Traditional hydraulically driven rodless oil production equipment basically adopts mechanical reversing or hydraulic linkage reversing. Regardless of the single reversing method adopted, there are risks of "high pressure" at startup, resonance during operation, or "dead point" problems during restart, which poses a hidden danger of unstable application.

[0004] Therefore, a single-stage hydraulic cylinder driven oil production device is proposed. Utility Model Content

[0005] In view of this, the embodiments of the present utility model hope to provide a single-stage hydraulic cylinder driven oil production device to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] The technical solution of the embodiment of the utility model is implemented as follows: a single-stage hydraulic cylinder driven oil production device, comprising:

[0007] An upper joint, an upper fluid cylinder, an upper plunger, an upper pump chamber, a cut-off reversing valve, a lower pump chamber, a lower plunger, a lower fluid cylinder and a lower joint connected in sequence;

[0008] Wherein, the upper liquid cylinder and the lower liquid cylinder are combined into a single-stage liquid cylinder;

[0009] The single-stage hydraulic cylinder drives the upper pump chamber and the lower pump chamber to work through the upper plunger and the lower plunger;

[0010] Cylinder working area S 缸 Greater than the pump lifting working area S 泵 .

[0011] In some embodiments: the upper joint has an upper oil pipe interface connected to the oil pipe, a center pipe interface connected to the center pipe, and an inserted sealing body.

[0012] In some embodiments: pump lift area S 泵 S is the working area of ​​the cylinder 缸 Subtract the plunger-rod area S0 of the upper plunger.

[0013] In some embodiments: the upper plunger is connected to the lower plunger via a plunger connecting rod, and the plunger connecting rod slides inside the isolating reversing valve.

[0014] In some embodiments: both the upper pump chamber and the lower pump chamber have oil inlet and outlet channels for oil transportation.

[0015] The embodiment of the utility model has the following advantages due to the adoption of the above technical solution:

[0016] The utility model single-stage hydraulic cylinder drives the upper and lower pump chambers to work, and the hydraulic cylinder working surface S 缸 With pump lifting working surface S 泵 The two end faces of the same piston, excluding the piston and connecting rod factors, the cylinder working area S 缸 Much larger than S 泵 That is S 缸 -S0;S 缸 -S0 is the pump lifting area, so the working pressure of the ground pump is relatively small, solving the high-pressure lifting problem of the hydraulic piston pump.

[0017] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a working principle diagram of the utility model;

[0020] Figure 2 It is a structural diagram of the utility model;

[0021] Figure 3 For this utility model Figure 1 Part of the structure Figure 1 ;

[0022] Figure 4 For this utility model Figure 1 Part of the structure Figure 2 ;

[0023] Figure 5 This is a working principle diagram of the utility model during oil production.

[0024] Figure numerals: 1, center pipe interface; 2, upper oil pipe interface; 3, insert seal; 4, working fluid injection channel; 5, upper liquid inlet channel; 6, upper valve ball 1; 7, upper valve seat 1; 8, water ring 1; 9, upper valve ball 2; 10, upper valve seat 2; 11, water ring 2; 12, upper liquid cylinder; 13, upper plunger assembly; 14, liquid inlet channel; 15, upper pump chamber; 16, plunger connecting rod ;17, change the upper liquid inlet;18, reversing valve core;19, reversing the middle liquid inlet;20, change the lower liquid inlet;21, reversing valve top rod;22, lower pump chamber;23, lower pump chamber inlet and outlet;24, lower plunger assembly;25, lower liquid cylinder;26, lower pump chamber discharge channel;27, lower pump chamber No. 1 valve outlet;28, lower valve ball No. 1;29, lower valve seat No. 1;30, water ring No. 4;3 1. Lower valve ball 2; 32. Lower valve seat 2; 33. Lower oil pipe interface; 34. Bottom liquid inlet channel; 35. Upper pump chamber discharge channel; 36. Upper liquid cylinder discharge port; 37. Upper pump chamber inlet and outlet; 38. Upper liquid cylinder inlet channel; 39. Lower liquid cylinder inlet and outlet upper port; 40. Lower liquid cylinder discharge channel; 41. Lower pump barrel assembly; 42. Upper pump chamber inlet and outlet channel; 43. Lower liquid cylinder inlet and outlet lower port Inlet; 44, No. 2 valve outlet of upper pump chamber; 45, working fluid depletion outlet; 46, produced fluid outlet; 47, lower pump chamber discharge outlet; 48, upper pump chamber discharge outlet; 49, working fluid depletion channel; 50, upper reversing outlet; 51, upper liquid cylinder depletion outlet; 52, lower liquid cylinder depletion outlet; 53, lower reversing outlet; 54, lower pump chamber liquid inlet channel outlet; 55, lower pump chamber liquid inlet channel inlet. DETAILED DESCRIPTION

[0025] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0026] It should be noted that the terms "first", "second", "symmetrical", "array", etc. are only used to distinguish between description and position description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the definition of "first", "symmetrical", etc. can explicitly or implicitly include one or more of these features; similarly, when the quantity of certain features is not limited in the form of words such as "two" or "three", it should be noted that this feature also explicitly or implicitly includes one or more feature quantities;

[0027] In the present invention, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "fixation" and the like should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection, a direct connection, welding, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on the description and drawings combined with specific circumstances.

[0028] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-4 As shown, the embodiment of the utility model provides a single-stage hydraulic cylinder driven oil production device, comprising:

[0030] The upper joint, the upper liquid cylinder 12, the upper plunger, the upper pump chamber 15, the cut-off reversing valve, the lower pump chamber 22, the lower plunger, the lower liquid cylinder 25 and the lower joint are connected in sequence;

[0031] Among them, the upper liquid cylinder 12 and the lower liquid cylinder 25 are combined into a single-stage liquid cylinder;

[0032] The single-stage hydraulic cylinder drives the upper pump chamber and the lower pump chamber to work through the upper plunger and the lower plunger;

[0033] Cylinder working area S 缸 Greater than the pump lifting working area S 泵 .

[0034] Specifically: the upper joint has an upper oil pipe interface 2 connected to the oil pipe, a center pipe interface 1 connected to the center pipe, and an inserted seal 3. The pump lifting area S 泵 S is the working area of ​​the cylinder 缸 Subtracting the area S0 of the plunger connecting rod 16 of the upper plunger, the upper plunger is connected to the lower plunger through the plunger connecting rod 16, and the plunger connecting rod 16 slides inside the partition reversing valve. Both the upper pump chamber 15 and the lower pump chamber 22 have oil inlet and outlet channels for oil transportation, which are used for oil to flow in and out.

[0035] like Figure 1 As shown, the single-stage hydraulic cylinder of the utility model drives the upper and lower pump chambers to work. The hydraulic cylinder working surface S 缸 With pump lifting working surface S 泵 The two end faces of the same piston, excluding the piston and connecting rod factors, the cylinder working area S 缸 Much larger than S 泵 That is S 缸 -S0;S 缸-S0 is the pump lifting area, so the working pressure of the surface pump is relatively small, solving the problem of high-pressure lifting of hydraulic piston pumps. This oil production device adopts single-stage hydraulic cylinder lifting, and is recommended for use in heavy oil wells with a depth of less than 3,000 meters and a displacement of less than 30 cubic meters per day.

[0036] The working fluid is deficient and is mixed with the bottom-hole produced fluid at the pump outlet and lifted to the surface together, realizing cold production of heavy oil mixed with water and rapid lifting. It is suitable for cold production of heavy oil mixed with water and ordinary thin oil production in conventional oil wells;

[0037] like Figure 5 As shown, when the single-stage hydraulic cylinder drives the oil production device to produce oil, two double-stage sealing packers are installed on the oil pipe string. After the packers are set, the well fluid production area and the working fluid circulation area are forcibly separated and strictly sealed in the oil casing annulus. Under the continuous action of the piston suction force, as the well fluid is continuously produced, the pressure in the bottom hole production area is gradually reduced, and finally negative pressure is formed, resulting in a "negative pressure oil production environment", increasing the production pressure difference, so that the formation can be continuously and strongly released into the well, accelerating the precipitation of formation fluid, increasing the liquid production of the oil well, and improving the recovery efficiency.

[0038] In addition, the well fluid of this oil production device enters the pump using the "negative pressure suction" method. Due to the extraordinary lifting capacity of this oil production device, a strong negative pressure suction capacity is created at the same time, laying the foundation for efficient oil production.

[0039] When the utility model is working, the center pipe interface 1 is connected with the center pipe, the upper oil pipe interface 2 is connected with the oil pipe, the center pipe is connected with the inserted sealing body 3, the working fluid enters the upper liquid inlet channel 5 through the working fluid injection channel 4 of the inserted sealing body 3, and respectively enters the upper change-up liquid inlet 17, the change-up middle liquid inlet 19, and the change-down liquid inlet 20. Two annular channels are arranged on the reversing valve core 18. Under the action of the upper plunger assembly 13, when the reversing valve top rod 21 is located at the lower dead center, the reversing center liquid inlet 19 is connected with the upper liquid cylinder liquid inlet channel 38, the working fluid enters the upper liquid cylinder 12, and pushes the upper plunger assembly 13, the plunger connecting rod 16, and the lower plunger assembly 24 to move downward. At the same time, the liquid in the upper pump chamber 15 enters the produced liquid discharge port 48 and the produced liquid outlet 46 along the upper pump chamber liquid inlet and outlet 37, the upper pump chamber liquid discharge channel 35, the upper valve ball 9, and the upper valve seat 10, and enters the oil pipe and the center pipe annular channel for discharge. At the same time, the lower pump chamber 22 is in the state of liquid inflow, and the bottom hole liquid passes through the bottom liquid inlet channel 34, the lower pump chamber liquid inlet channel inlet 55, the lower pump chamber liquid inlet channel outlet 54, and enters the lower pump chamber 22 through the water ring No. 4 30, the lower valve ball 1 28, the lower valve seat 1 29, and the lower pump chamber No. 1 valve outlet 27. At the same time, the working liquid in the lower liquid cylinder 25 is exhausted, along the lower liquid cylinder inlet and discharge lower port 43, the lower liquid cylinder discharge channel 40, the lower liquid cylinder inlet and discharge upper port 39, through the upper annular channel of the reversing valve core 18, connected with the lower liquid cylinder exhaust outlet 52, enters the working liquid exhaust channel 49, and is discharged through the working liquid exhaust outlet 45 mixed with the produced liquid;

[0040] Under the action of the lower plunger assembly 24, when the reversing valve push rod 21 is at the top dead center, the reversing intermediate liquid inlet 19 is connected with the lower liquid cylinder liquid inlet and discharge upper port 39, the lower liquid cylinder discharge channel 40, and the lower liquid cylinder liquid inlet and discharge lower port 43, and the working fluid enters the lower liquid cylinder 25, pushing the lower plunger assembly 24, the plunger connecting rod 16, and the upper plunger assembly 13 to move upward. At the same time, the liquid in the lower pump chamber 22 moves along the lower pump chamber liquid inlet and discharge port 23 and the lower pump chamber discharge port 43. Channel 26, water ring No. 1 8, upper valve ball No. 1 6, upper valve seat No. 1 7, lower pump chamber discharge port 47, and produced liquid outlet 46 enter the oil pipe and central pipe annulus channel for discharge; at the same time, the upper pump chamber 15 is in a liquid inflow state, and the bottom hole fluid passes through the bottom liquid inlet channel 34, lower valve ball No. 2 31, lower valve seat No. 2 32, upper pump chamber No. 2 valve outlet 44, upper pump chamber inlet and discharge channel 42, and upper pump chamber inlet and outlet 37. At the same time, the working fluid in the upper liquid cylinder 12 is exhausted and mixed with the produced fluid and discharged along the upper liquid cylinder discharge port 36, the upper liquid cylinder inlet channel 38, the upper annular channel of the reversing valve core 18, the upper liquid cylinder exhaust outlet 51, the working fluid exhaust channel 49, and the working fluid exhaust outlet 45.

[0041] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A single-stage hydraulic cylinder driven oil production device, characterized in that: include: An upper joint, an upper liquid cylinder (12), an upper plunger, an upper pump chamber (15), a cut-off reversing valve, a lower pump chamber (22), a lower plunger, a lower liquid cylinder (25) and a lower joint are connected in sequence; Wherein, the upper liquid cylinder (12) and the lower liquid cylinder (25) are combined into a single-stage liquid cylinder; The single-stage hydraulic cylinder drives the upper pump chamber and the lower pump chamber to work through the upper plunger and the lower plunger; Cylinder working area S 缸 Greater than the pump lifting working area S 泵 .

2. A single-stage hydraulic cylinder driven oil production device according to claim 1, characterized in that: The upper joint comprises an upper oil pipe interface (2) connected to the oil pipe, a central pipe interface (1) connected to the central pipe, and an inserted sealing body (3).

3. A single-stage hydraulic cylinder driven oil production device according to claim 1, characterized in that: Pump lifting area S 泵 S is the working area of ​​the cylinder 缸 Subtract the area S0 of the plunger rod (16) of the upper plunger.

4. A single-stage hydraulic cylinder driven oil production device according to claim 3, characterized in that: The upper plunger is connected to the lower plunger via a plunger connecting rod (16), and the plunger connecting rod (16) slides inside the isolating reversing valve.

5. The single-stage hydraulic cylinder driven oil production device according to claim 1, characterized in that: The upper pump chamber (15) and the lower pump chamber (22) are both provided with oil inlet and outlet channels for oil transportation.

Images