A same wellbore pressure-dividing separate production pipe string device for pressure-regulated regulation, discharge and sand removal

Abstract

The present application relates to the technical field of oil and gas exploitation equipment, in particular to a same-well-bore pressure division and separate production pipe column device for pressure regulation and sand discharge, a first annular area is arranged between the oil pipe and the casing, a second annular area is arranged between the hollow sucker rod and the oil pipe, a plunger joint is arranged between the hollow sucker rod and the plunger, a movable flow guide and sand guide device is mounted on the outer surface of the plunger joint, the packer is located at the oil pipe connection position, eight holes are arranged in two sections with different heights on the wall surface of the oil pipe, and four holes are arranged in one section, the pipe column structure is established according to the reservoir characteristics, in order to solve the problems of liquid accumulation in the oil pipe and casing area, and the packer cannot be unsealed during pressure division and separate production, the normal pressure division and separate production can be carried out through the sand discharge device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploitation equipment, in particular to a same-wellbore pressure-dividing separate production pipe string device for pressure-regulated flow discharge and sand discharge. BACKGROUND

[0002] At present, the design of oil and gas reservoir combined production pipe string mainly includes two cases: one is when the reservoir pressure difference is small, mainly including fixed pressure production allocator combined production, proportional separate production pump separate production, etc., and the other is when the reservoir pressure difference is large, mainly including single pipe separate production, double pipe separate production, double pump separate production process pipe string, etc. Generally, it is liquid production of two pressure systems, which cannot realize the separate discharge of gas and liquid without interference, cannot accurately measure the contribution of different production layers, cannot solve the problems of packer sticking caused by well fluid carrying sand and excessive fluid accumulation causing well flooding and production stoppage, and cannot solve the combination characteristics of upper tight gas and lower deep coalbed methane production layers, combined with the characteristics of tight gas not needing water drainage and pressure reduction, i.e. gas carrying liquid production. When the water production is large and does not meet the gas carrying liquid condition, only relying on gas carrying liquid (formation water), gas carrying sand, and coal powder solid particles cannot completely discharge the formation water and solid particles. Once the tight gas production decreases, the formation water and solid particles will quickly accumulate above the packer, the formation water will cause well flooding, and the solid particles deposited above the packer will cause the packer to be unable to normally unblock, thereby increasing the production cost during workover operation. SUMMARY

[0003] (I) Invention purpose

[0004] Therefore, the purpose of the present application is to provide a same-wellbore pressure-dividing separate production pipe string device for pressure-regulated flow discharge and sand discharge, which solves the problems mentioned in the background.

[0005] (II) Technical solutions

[0006] The utility model provides a kind of wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's same wellbore pressure regulating and releasing sand's

[0007] Preferably, the movable flow guide sand guide device comprises an upper baffle, and the upper baffle is integrally formed with the plunger joint.

[0008] Preferably, the outer surface of the upper baffle is provided with a baffle bolt, and the outer surface of the baffle bolt movably provided with a lower baffle, and the outer surface of one end of the lower baffle is provided with a baffle nut.

[0009] Preferably, the upper baffle and the lower baffle are provided with a support plate, and the support plate is connected with a rubber ring through a rubber ring nut and a rubber ring bolt.

[0010] Preferably, the outer surface of the lower ear is provided with a screw groove.

[0011] Preferably, the eccentric adjustable pressure one-way relief valve is symmetrically distributed on the outer surface of the oil pipe.

[0012] Preferably, the inner wall of the upper ear movably provided with a thimble.

[0013] From the above technical solution, the present application has the following advantages:

[0014] 1. The application establishes a pipe column structure for pressure regulating and releasing sand, to solve the problems of liquid accumulation in the oil pipe and casing area, and the inability to unseal the packer, and to enable normal pressure regulating and releasing sand, so that the pipe column design of the oil pipe and casing, the oil pipe and the hollow sucker rod, and the three production channels inside the hollow sucker rod can be completed in the limited space of the wellbore.

[0015] 2. The invention is aimed at the problem of water and sand production in tight gas reservoirs, and increases the eccentric adjustable pressure one-way relief valve and movable flow guiding and sand guiding device in the pipe string structure, and fully utilizes the up and down movement of the hollow sucker rod, realizes the water and sand falling into the second annular area flowing into the first annular area below the packer, solves the problem of water and sand production in the upper part of the tight gas, and avoids the problems of well flooding and packer unsealing.

[0016] 3. The invention adjusts the critical pressure value before going down the well through the one-way relief valve, so as to adapt to the liquid and sand accumulation in different gas wells and realize the adjustment of the bottom hole pressure of the upper reservoir, and solves the problems of gas production reduction, gas carrying liquid and gas carrying solid. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the well string pipe column structure for separate pressure and separate production of tight gas and coalbed methane;

[0018] Figure 2 It is the structure diagram and installation position of the eccentric adjustable pressure one-way relief valve;

[0019] Figure 3 It is the structure diagram of the movable flow guiding and sand guiding device;

[0020] Figure 4 It is the different state diagram of the rubber ring up and down stroke of the movable flow guiding and sand guiding device.

[0021] In the figure: 1, hollow sucker rod; 2, oil pipe; 3, packer; 4, casing; 5, plunger joint; 6, pump cylinder joint; 7, plunger; 8, pump cylinder; 9, eccentric adjustable pressure one-way relief valve; 10, screen pipe; 11, movable flow guiding and sand guiding device; 12, liquid and sand discharging hole; 901, liquid outlet; 902, first joint; 903, spring; 904, valve core; 905, valve body; 906, valve core hole; 907, liquid inlet; 908, lower ear; 909, thimble; 910, upper ear; 1101, baffle nut; 1102, upper baffle; 1103, lower baffle; 1104, baffle bolt; 1105, support plate; 1106, rubber ring nut; 1107, rubber ring; 1108, rubber ring bolt. DETAILED DESCRIPTION

[0022] The following description is merely exemplary in nature and is not intended to limit the disclosure, application and uses. It should be understood that throughout the drawings, the same or similar reference numerals can indicate the same or similar parts and features. The various drawings only schematically represent the concepts and principles of the embodiments of the disclosure, and do not necessarily show the specific dimensions and their proportions of the various embodiments of the disclosure. The specific parts in the specific drawings can be exaggerated to illustrate the relevant details or structures of the embodiments of the disclosure.

[0023] Referring to Figures 1-4 , the present application provides an embodiment:

[0024] A wellbore pressure regulating and sand discharging device includes a hollow sucker rod 1, a tubing 2, a packer 3, a casing 4, a plunger 7, and a screen pipe 10. The tubing 2 is provided with a pump cylinder joint 6 at one end, and the pump cylinder joint 6 is connected with a pump cylinder 8 at one end. The tubing 2 and the casing 4 form a first annular area, and the hollow sucker rod 1 and the tubing 2 form a second annular area. The hollow sucker rod 1 is provided with a plunger joint 5 between the hollow sucker rod 1 and the plunger 7, and the plunger joint 5 is provided with a movable flow guide and sand guide device 11 on the outer surface. The packer 3 is located at the connection position of the tubing 2. The tubing 2 wall is provided with two different height cross sections and eight holes. One cross section has four holes. The tubing 2 part between the upper and lower dead points of the sucker rod movement is provided with two circles of drainage and sand discharge holes at equal intervals. The first annular area between the tubing 2 and the casing 4 produces formation water and solid particles such as sand, which flows into the first annular area below the packer, so that the formation water and solid particles in the first annular area are smoothly discharged through the operation of the tubular pump. The outer surfaces of both sides of the tubing 2 are provided with a lower ear 908 and an upper ear 910. The eccentric adjustable pressure one-way drainage valve 9 is installed between the upper ear 910 and the lower ear 908. The eccentric adjustable pressure one-way drainage valve 9 includes a valve body 905. The top end of the valve body 905 is provided with a first joint 902. The top end of the first joint 902 is provided with a liquid outlet 901. The inside of the valve body 905 is provided with a spring 903, a valve core 904, and a valve core hole 906. The bottom end of the valve body 905 is provided with a liquid inlet 907. The compression spring 903 can adjust the pressure of the one-way drainage valve to be in the range of 2-5 MPa before being lowered into the wellbore.

[0025] Further, the movable flow guide and sand guide device 11 includes an upper baffle 1102, which is welded with the plunger joint 5 in an integrated structure, providing high strength and stability, and can resist vibration, distortion and stress.

[0026] Further, the upper baffle 1102 is provided with a baffle bolt 1104 on the outer surface, and the baffle bolt 1104 is movably provided with a lower baffle 1103 on the outer surface. The lower baffle 1103 is provided with a baffle nut 1101 on the outer surface at one end. Rotating the baffle nut 1101 allows the lower baffle 1103 to move up and down on the outer surface of the baffle bolt 1104.

[0027] Further, a support plate 1105 is arranged between the upper baffle 1102 and the lower baffle 1103, and one end of the support plate 1105 is connected with a rubber ring 1107 through a rubber ring nut 1106 and a rubber ring bolt 1108, the rubber ring nut 1106 and the rubber ring bolt 1108 are tightly fixed together to ensure the stability and mobility of the device, and the rubber ring 1107 is used to provide sealing and damping effect.

[0028] Further, the outer surface of the lower ear 908 is provided with a screw groove, so that the joint 902 can be screwed into connection, so that the distance between the upper joint 901 and the valve core 904 is shortened.

[0029] Further, the eccentric adjustable pressure one-way relief valve 9 is symmetrically distributed on the outer surface of the oil pipe 2, and the symmetrical distribution can ensure that the fluid uniformly enters the one-way relief valve from different directions. This helps to reduce uneven flow distribution, thereby maintaining the stability of the device.

[0030] Further, the inner wall of the upper ear 910 movably installs the thimble 909, and the thimble 909 presses the bottom of the valve body 905.

[0031] Working principle: The upper dense gas is discharged through the annulus between the oil pipe 2 and the casing 4, the lower coalbed gas is discharged through the annulus between the oil pipe 2 and the hollow sucker rod 1, and the water and coal powder produced by the lower coalbed gas are discharged through the internal passage of the hollow sucker rod 1. The two gas production channels are not interfered with each other through the packer 3, but due to the existence of the packer 3, the water and sand produced by the upper dense gas cannot be discharged through the internal passage of the hollow sucker rod 1. When the formation water and sand and other solid particles accumulate to a certain degree, the pressure on one side of the one-way valve 9 is higher than the starting pressure, and the one-way valve 9 is opened. The formation water and sand and other solid particles immediately enter the second annular area between the oil pipe 2 and the hollow sucker rod 1, and then fall along the annular space. When falling to the surface of the movable flow guide and sand guiding device 11, the rubber ring 1107 of the movable flow guide and sand guiding device 11 changes the direction due to the change of the up-down stroke. When the hollow sucker rod 1 is in the down stroke, the rubber ring 1107 of the movable flow guide and sand guiding device 11 is in the downward concave state, and the formation water and sand and other solid particles accumulate here. When the hollow sucker rod 1 is in the up stroke, the rubber ring 1107 of the movable flow guide and sand guiding device 11 is in the upward convex state, and the accumulated formation water and sand and other solid particles will slide down along the surface of the movable flow guide and sand guiding device 11 due to the gravity, and flow into the first annular area between the oil pipe 2 and the casing 4 through the liquid and sand discharge hole 12, and finally realize that the formation water and sand and other solid particles produced in the two annular areas are discharged from the wellbore through the internal passage of the hollow sucker rod 1 by the working of the tubular pump. The formation water and sand and other solid particles are produced during the production of the dense gas, and if they cannot be discharged in time, they will continue to accumulate. When accumulated to a certain degree, the pressure of the liquid and solid phases is greater than the set pressure of the one-way valve, the pushing force of the liquid and solid phases on the valve core 904 is greater than the spring force of the spring 903 itself, the channel is connected, the liquid and solid phases enter the one-way valve through the liquid inlet 907, then enter the channel from the valve core hole 906, finally reach the liquid outlet 901, and finally enter the second annular space between the hollow sucker rod 1 and the oil pipe 2. The formation water and sand and other solid particles produced in the first annular area between the oil pipe 2 and the casing 4 enter the second annular area between the hollow sucker rod 1 and the oil pipe 2 through the one-way drainage valve 9. If not treated, the formation water and sand and other solid particles will continue to fall and enter the annular gap between the lower tubular pump plunger 7 and the pump cylinder 8, causing pump jam. To prevent pump jam and pump burying, the movable flow guide and sand guiding device 11 is designed between the hollow sucker rod 1 and the plunger joint 5. The upper baffle 1102 is welded with the plunger joint 5 between the hollow sucker rod 1 and the plunger 7 as an integrated structure, and the lower baffle 1103 is in clearance fit with the plunger joint 5 between the hollow sucker rod 1 and the plunger 7, and can slide up and down along the plunger joint 5.The rubber ring 1107 of the movable flow guiding and sand guiding device 11 is in non-resistance contact with the oil pipe 2. Before the device is lowered into the well, the rubber ring 1107 is connected with the support plate 1105 through bolts, then the lower baffle 1103 is moved to clamp the support plate 1105 between the upper and lower baffles, and the baffles are coupled through the baffle bolts 1104. When the upper stroke, the rubber ring 1107 of the movable flow guiding and sand guiding device is in the upward convex state, and when the lower stroke, the rubber ring 1107 of the movable flow guiding and sand guiding device 11 is in the downward concave state, and the oil pipe 2 wall surface above the lower dead point position is perforated. When the formation water and sand and other solid particles are accumulated above the movable flow guiding and sand guiding device 11, they will flow along the surface of the movable flow guiding and sand guiding device 11 to the drainage and sand discharge hole 12, enter the first annular area, and finally be discharged from the wellbore through the internal passage of the hollow sucker rod 1.

[0032] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore considered in all respects to be illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein and their legal equivalents to be covered by protection. None of the elements recited in the claims should be understood as being impliedly disclaimed, including any of the elements impliedly disclaimed by the express inclusion of a reference to a portion of claim language indicating that it is encompassed within the patentably distinct claim element.

Claims

1. A pressure-regulating, flow-dissipating, and sand-removing tubing string device for pressure distribution and production within the same wellbore, comprising a hollow sucker rod (1), tubing (2), packer (3), casing (4), plunger (7), and screen pipe (10), wherein one end of the tubing (2) is provided with a pump barrel connector (6), and one end of the pump barrel connector (6) is connected to a pump barrel (8), characterized in that: The first annular region is between the tubing (2) and the casing (4), and the second annular region is between the hollow sucker rod (1) and the tubing (2). A plunger joint (5) is provided between the hollow sucker rod (1) and the plunger (7), and a movable flow guiding and sand guiding device (11) is installed on the outer surface of the plunger joint (5). One end of the movable flow guiding and sand guiding device (11) is fixedly connected to the plunger joint (5), and the other end is in unobstructed contact with the tubing (2) through a rubber ring (1107). The packer (3) is located at the connection position of the tubing (2). Eight sections are opened at two different heights above the bottom dead center position of the movable flow guiding and sand guiding device (11) on the wall of the tubing (2). The oil pipe (2) has four holes in a cross section. The outer surfaces of both sides of the oil pipe (2) are provided with a lower ear (908) and an upper ear (910). An eccentric adjustable pressure one-way relief valve (9) is installed between the upper ear (910) and the lower ear (908). The eccentric adjustable pressure one-way relief valve (9) includes a valve body (905). A first connector (902) is installed at the top of the valve body (905), and an outlet (901) is opened at the top of the first connector (902). A spring (903), a valve core (904), and a valve core hole (906) are provided inside the valve body (905). An inlet (907) is opened at the bottom of the valve body (905).

2. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 1, characterized in that: The movable flow guiding and sand guiding device (11) includes an upper baffle (1102), which is welded to the plunger joint (5) as an integrated structure.

3. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 2, characterized in that: The upper baffle (1102) is equipped with a baffle bolt (1104) on its outer surface, and a lower baffle (1103) is movably installed on the outer surface of the baffle bolt (1104). A baffle nut (1101) is installed on the outer surface of one end of the lower baffle (1103).

4. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 3, characterized in that: A support plate (1105) is provided between the upper baffle (1102) and the lower baffle (1103), and one end of the support plate (1105) is connected to a rubber ring (1107) by a rubber ring nut (1106) and a rubber ring bolt (1108).

5. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 1, characterized in that: The outer surface of the lower ear (908) is provided with a screw groove.

6. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 1, characterized in that: The eccentric adjustable pressure one-way relief valve (9) is symmetrically distributed on the outer surface of the oil pipe (2).

7. The pressure-regulating, flow-discharging, and sand-removing casing device for the same wellbore pressure-dividing and production line according to claim 1, characterized in that: A pin (909) is movably mounted on the inner wall of the upper ear (910).

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