Adjustable pump bottom pressure control device

Abstract

The utility model discloses an adjustable pump bottom pressure control device which can be directly installed under a pump when pump running operation under pressure is needed, an inner control rod is adjusted until a fixed valve of an oil well pump is opened, the pump running operation under pressure can be carried out after a nut is locked, and sealing and locking mechanisms in all positions of the device ensure the reliability of the device. And meanwhile, the pressure control module is subjected to wear-resistant and anti-corrosion treatment by adopting a tungsten-nickel alloy plating technology, so that the diversity of applicable operation environments of the device is further guaranteed, the improvement of the operation efficiency and the reliability of operation safety are finally realized, and the out-of-control of the pressure in the pipe in the operation process is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the oil and gas field development under pressure pump operation supporting tool field, specifically relates to a adjustable pump bottom pressure control device. BACKGROUND

[0002] In the oil and gas field development field, especially new well self-suction turns to pumping, in order to further stabilize production and protect the reservoir, preferentially implement under pressure operation, and need to ensure that the tubing pressure is controllable in the process of under pressure pump operation, but the existing oil pump has not realized the pump switch, or the switch device is not mature, in order to avoid the emergence of complex situation, the main technology at present is to install pressure control device under the pump to implement temporary plugging of the oil pump, and to design position to cut off shear pin, and the built-in valve rod falls into the tail pipe, and then realizes the smooth flow in the pipe, and successfully turns to pumping.

[0003] The existing under pressure pump operation supporting tool mainly has two kinds, one is to install pump bottom valve with switch function under the pump, which is usually matched with the structure design of oil pump, and the liquid inlet channel is opened when normal production is realized, and the repeated switch is realized through spring, transposition and track mechanism, and the switch performance cannot be guaranteed after a certain period of production in the application process, and there is the possibility of well blowout overflow in the secondary under pressure operation process. The other is to install pump bottom valve with pressure control function under the pump, only need to lift the fixed valve before under pressure pump, leave a certain channel, and after under pump is completed, the pressure control device is cut off and falls into the tail pipe to realize normal production, and the tool can only realize single switch, and cannot realize repeated switch.

[0004] In the downhole operation site, considering the complexity and uncertainty of downhole environment, the simpler the downhole tool structure is, the more reliable it is. For the second under pressure pump operation supporting tool, the valve rod cannot be adjusted in the application process, the two sealing rings affect the device falling into the tail pipe, the sealing material cannot be applied to high gas-liquid ratio and gas well requirements, and the valve rod and the contact area with the valve body do not take anticorrosion measures.

[0005] The main technology at present is a utility model patent with the disclosure number CN208380549U: a pressure control pump bottom valve and a pressure control device, which has the following problems in the application process: 1. A certain length of valve rod needs to be reserved during installation, and the excess part is sawn off after installation, different pump barrel structures need to be sawn off to different lengths, the valve rod cannot be adjusted in real time, the efficiency is low, and the error is large; 2. Two sealing rings are arranged at the lower part of the valve rod, and when the pressure is blocked and the shear pin is broken, due to the two sealing rings, the pressure is too high when the pressure is blocked, and the shear pin is normally broken, but does not fall into the tail pipe, thereby causing the problem that the oil pump production is normal but the liquid is not smooth, and the yield is not high; 3. The sealing ring material is selected to be ordinary nitrile rubber, which cannot meet the sealing requirements of high gas-liquid ratio oil wells and gas wells, resulting in sealing failure during operation, increased pressure in the pipe, and remediation by using well killing, which causes pollution to the reservoir; 4. No corrosion protection measures are taken for the contact area between the valve rod and the valve body, and there are toxic and corrosive substances such as hydrogen sulfide, carbon dioxide and carbon monoxide in the operation environment, and long operation time will increase the risk of surface corrosion and leakage.

[0006] In order to meet the operation of the pump under pressure, the commonly used technology is that the matched pump bottom switch tool mainly includes a hydraulic pipe pump bottom valve, a touch type pipe pump bottom valve and a rod pump bottom valve, which mainly realizes the switching function by using the principles of spring, valve and rail switching, and the structure is relatively complex. When operating under pressure, the oil inlet channel is opened, but it is limited by the performance of the spring and the downhole environment, and often cannot be closed or cannot be closed tightly after working for a period of time under pressure, causing the risk of well blowout overflow. Utility model content

[0007] The utility model aims at providing a pump bottom pressure control device which is relatively simple in structure, adjustable, moderate in pressure blocking pressure, and has certain corrosion resistance.

[0008] The utility model aims at realizing the following technical means, a pump bottom pressure control device which is adjustable, including fixed valve cover, fixed valve seat joint and pressure control device outer cylinder which are hollow and connected in sequence from top to bottom, and the hollow structure forms a liquid passage;

[0009] A blocking piece is arranged in the fixed valve cover and blocks the upper opening of the fixed valve seat joint;

[0010] A pressure control body is connected inside the pressure control device outer cylinder, the pressure control body is attached to the inner wall of the pressure control device outer cylinder, and the liquid passage of the pressure control device outer cylinder is blocked;

[0011] A control rod hole is formed in the pressure control body, an inner control rod outer cylinder is connected in the control rod hole, an inner control rod is connected in the inner control rod outer cylinder in a screwed manner, an end head is connected to the upper end of the inner control rod, and the end head extends into the liquid passage of the fixed valve cover.

[0012] The limiting step in the protrusion is arranged on the inner wall of the outer cylinder of the pressure control device above the pressure control body, and is used for limiting the pressure control body.

[0013] The plugging member is a valve ball, and the height and width of the liquid passage in the hollow of the fixed valve cover are greater than the diameter of the valve ball.

[0014] The valve ball is matched with the size of the opening above the fixed valve seat joint, and is used for plugging the communication port of the fixed valve seat joint and the fixed valve cover.

[0015] The shear pin is arranged on the outer cylinder of the pressure control device, and is connected with the pressure control body.

[0016] The control rod sealing ring is arranged in the control hole of the pressure control body, and is used for sealing the inner wall of the pressure control body and the outer wall of the inner control rod outer cylinder; and the pressure control body sealing ring is arranged on the outer wall of the pressure control body, and is used for sealing the outer wall of the pressure control body and the inner wall of the outer cylinder of the pressure control device.

[0017] The control rod gland is further arranged on the outer cylinder of the inner control rod, and the upper tightening pin and the lower tightening pin are further connected to the control rod gland.

[0018] The locking nut is further threadedly connected to the inner control rod below the control rod gland.

[0019] The locking pin is further arranged on the locking nut, and the locking pin is fixedly connected with the inner control rod through the locking nut.

[0020] The inner control rod sealing ring is arranged on the inner control rod in the inner control rod outer cylinder.

[0021] The beneficial effects of the utility model lie in that the position of the inner control rod is adjusted through the thread of the inner control rod outer cylinder, the valve ball is pushed to the inlet at the upper end of the fixed valve cover through the forward end head of the inner control rod, and the inlet at the upper end of the fixed valve seat joint is prevented from being blocked by the valve ball. After the gland is tightened, the locking nut is well locked, and the locking pin is inserted, so that the position of the inner control rod is effectively ensured to be fixed and inactivated. The installation is fast, the adjustment is simple, the pressure is prevented from being reduced, the adaptability to the downhole operation environment is enhanced, one device can be universally used for different specifications of the pipe type oil pump, the on-site operation efficiency is greatly improved, and the occurrence of leakage and other well control safety events caused by sealing and corrosion problems is reduced. DRAWINGS

[0022] Fig. 1 It is an initial state structure diagram of an adjustable pump bottom pressure control device.

[0023] Fig. 2 It is a valve ball working state structure diagram.

[0024] 1 fixed valve cover; 2 fixed valve seat joint; 3 pressure control device outer cylinder; 4 upper tightening nail; 5 inner control rod outer cylinder; 6 lower tightening nail; 7 locking pin; 8 inner control rod; 9 fixed valve cover liquid flow passage; 10 valve ball; 11 end; 12 control rod sealing ring; 13 pressure control body sealing ring; 14 shear pin; 15 pressure control body; 16 inner control rod sealing ring; 17 control rod gland; 18 locking nut;

[0025] The utility model will be made further detailed description in combination with the drawings and examples. Specific implementation

[0026] An adjustable pump bottom pressure control device, comprising a fixed valve cover 1, a fixed valve seat joint 2 and a pressure control device outer cylinder 3 connected in sequence from top to bottom and hollow, the hollow structure forms a liquid passage;

[0027] The fixed valve cover 1 is provided with a blocking member for blocking the upper opening of the fixed valve seat joint 2;

[0028] The pressure control device outer cylinder 3 is internally connected with a pressure control body 15, which is attached to the inner wall of the pressure control device outer cylinder 3, thereby blocking the liquid passage of the pressure control device outer cylinder 3;

[0029] The pressure control body 15 is provided with a control rod hole, and the inner control rod outer cylinder 5 is connected in the control rod hole, the inner control rod 8 is threadedly connected in the inner control rod outer cylinder 5, the end 11 is connected to the upper end of the inner control rod 8, and the end 11 extends into the liquid passage of the fixed valve cover 1.

[0030] As shown in Figs. 1-2 The fixed valve cover 1, the fixed valve seat joint 2 and the pressure control device outer cylinder 3 are sequentially connected by threads from top to bottom, and all are hollow cylinders, and the inner hollow part forms a liquid passage.

[0031] The blocking member is a valve ball 10, and the height and width of the hollow liquid passage in the fixed valve cover 1 are greater than the diameter of the valve ball 10.

[0032] The fixed valve cover 1 is provided with a movable blocking member, and the height and width of the hollow liquid passage in the fixed valve cover 1 are greater than the diameter of the valve ball 10, so that the valve ball 10 can move in the fixed valve cover 1, and the upper end of the fixed valve cover 1 is provided with an opening, which is a part of the fixed valve cover 1 and is used as an oil and gas passage in normal production process.

[0033] The valve ball 10 is placed in the fixed valve cover 1, and the space satisfies the up-and-down movement of the valve ball 10, thereby realizing the opening and closing of the liquid passage, that is, by moving the valve ball 10, the upper opening of the fixed valve seat joint 2 is blocked or left, and when the upper opening of the fixed valve seat joint 2 is blocked, the liquid passage is closed, and when the upper opening of the fixed valve seat joint 2 is left, the liquid passage is opened.

[0034] The fixed valve seat joint 2 is used to connect the pump down control pressure device or other pump down accessory structure, the control pressure device outer cylinder 3 is used to realize the connection with the lower part of the pump, and the inner surface is treated by plating tungsten nickel alloy layer.

[0035] The size of the opening above the fixed valve seat joint 2 matches the valve ball 10, which is used to block the communication port of the fixed valve seat joint 2 and the fixed valve cover 1.

[0036] The lower end of the fixed valve cover 1 is connected with the fixed valve seat joint 2, the valve ball 10 matches the liquid inlet of the fixed valve seat joint 2, that is, the opening of the connection between the upper part of the fixed valve seat joint 2 and the fixed valve cover 1, when the valve ball 10 falls, the liquid inlet of the fixed valve seat joint 2 is blocked.

[0037] The control pressure body 15 is connected with the control pressure device outer cylinder 3, which blocks the hollow structure inside the control pressure device outer cylinder 3 and prevents the liquid from passing through.

[0038] The control pressure body 15 is provided with a control rod hole, and the inner control rod outer cylinder 5 is arranged in the hole, the inner control rod outer cylinder 5 is fixedly connected with the control pressure body 15 in an integrated manner, the inner control rod 8 penetrates through the inner control rod outer cylinder 5 from below and extends upward until the end head 11 at the front end extends into the fixed valve cover 1, the valve ball 10 is pushed away from the liquid inlet of the fixed valve seat joint 2, and the valve ball 10 is prevented from blocking the liquid inlet of the fixed valve seat joint 2.

[0039] The inner control rod outer cylinder 5 is provided with an internal thread, and the inner control rod 8 is provided with a matching external thread, so that the position of the end head 11 at the front end of the inner control rod 8 can be adjusted by rotating the inner control rod 8. The outer diameter of the inner control rod 8 is 20 mm.

[0040] The surface of the control pressure body 15 is treated by plating tungsten nickel alloy, which is used to bear the bottom hole pressure during the downhole pump process and ensure that the pressure in the pipe is controllable.

[0041] The inner wall of the control pressure device outer cylinder 3 above the control pressure body 15 is provided with a raised limiting step, which is used to limit the control pressure body 15.

[0042] The inner wall of the control pressure device outer cylinder 3 above the control pressure body 15 is provided with a raised limiting step, which is used to limit the control pressure body 15.

[0043] The control pressure device outer cylinder 3 is provided with a shear pin 14, and the shear pin 14 is connected with the control pressure body 15 through the control pressure device outer cylinder 3.

[0044] The control pressure body 15 is fixed with the control pressure device outer cylinder 3 through the shear pin 14, and the shear pin 14 penetrates through the control pressure device outer cylinder 3 and is inserted into the control pressure body 15.

[0045] The shear pin 14 is used for fixing the pressure control body 15, and is sheared off when the pressure exceeds the shear pin strength.

[0046] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0047] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0048] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0049] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0050] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0051] The control rod sealing ring 12 is arranged in the control hole of the pressure control body 15, and is used for sealing the inner wall of the pressure control body 15 and the outer wall of the inner control rod outer cylinder 5.

[0052] Specifically, a hole is punched on the control rod cover 17 and reaches the inner control rod outer cylinder 5, but does not penetrate the inner control rod outer cylinder 5. The upper tightening pin 4 is inserted into the hole to further connect the control rod cover 17 and the inner control rod outer cylinder 5, and the overall structure is similar to the conventional shear pin, but does not need to bear the shear force. The upper tightening pin 4 can be a common split pin, or a bolt can also be inserted into the hole.

[0053] The lower tightening pin 6, the control rod cover 17 and the inner control rod outer cylinder 5 are also connected in the same way.

[0054] The inner control rod 8 below the control rod cover 17 is further threadedly connected with the locking nut 18.

[0055] The locking pin 7 is further arranged on the locking nut 18 and is fixedly connected with the inner control rod 8 by penetrating the locking nut 18.

[0056] Locking nut 18 cooperates with control rod gland 17 to limit the position, to ensure that the inner control rod 8 is not loose, locking nut 18 is arranged on the inner control rod 8 below the control rod gland 17, and is rotated to fit below the control rod gland 17.

[0057] After the locking nut 18 is rotated in place, the locking pin hole is punched inward from the outside of the locking nut 18 (i.e. the side of the locking nut 18 away from the center inner control rod 8), and the locking pin hole is punched into the inner control rod 8, and then the locking pin 7 is inserted into the locking pin hole, and the locking pin 7 further fixes the locking nut 18 and the inner control rod 8.

[0058] The inner control rod 8 in the inner control rod outer cylinder 5 is provided with an inner control rod sealing ring 16.

[0059] The inner control rod sealing ring 16 is used to seal the gap between the inner control rod 8 and the inner control rod outer cylinder 5.

[0060] During actual operation, the corresponding tubing buckle joint type (tubing buckle is a connecting piece for connecting with the pump cylinder) is selected according to the specific specifications of the pump cylinder fixed valve seat joint 2, and the pressure bearing grade of the shear pin 14 is adjusted according to the operating pressure.

[0061] After confirming the size specifications, the tool is installed at the lower part of the pump cylinder.

[0062] During the installation process of the tool, the valve ball 10, the pressure control body 15, the inner control rod outer cylinder 5, the fixed valve cover 1, the fixed valve seat joint 2 and the pressure control device outer cylinder 3 are first installed together;

[0063] After installation, the inner control rod 8 is inserted into the pressure control body 15 and the inner control rod outer cylinder 5, and the inner control rod 8 is rotated to adjust the inner control rod 8 so that the front end head 11 of the inner control rod 8 approaches the valve ball 10 and is lifted to realize the communication between the fixed valve cover liquid flow passage 9 and the lower passage.

[0064] After the inner control rod 8 front end head 11 lifts the valve ball 10 into position, the control rod gland 17 is tightened on the inner control rod outer cylinder 5, and the upper tightening pin 4 and the lower tightening pin 6 are simultaneously tightened.

[0065] After the control rod gland 17 is tightened, the locking nut 18 and the locking pin 7 are tightened.

[0066] The pin and pin hole structure of the upper tightening pin 4 (corresponding to the pin hole located on the control rod gland 17 and the inner control rod outer cylinder 5), the lower tightening pin 6 (corresponding to the pin hole located on the control rod gland 17 and the inner control rod outer cylinder 5) and the locking pin 7 (corresponding to the pin hole located on the locking nut 18 and the inner control rod 8) are all fixed by punching holes and inserting pins on site after determining the position. Before the holes are punched, these structures can be adjusted in position.

[0067] After the above steps are completed, the oil pump and the tool are sequentially put into the well by the belt pressure operating device.

[0068] After entering the well to the designed position, the casing is opened, the ground pump truck is matched to enter the liquid from the tubing to stop the pressure, the pressure reaches the shear pressure, the shear pin 14 is sheared, the pressure control body 15 is no longer fixed with the pressure control device outer cylinder 3, and the pressure control body 15 and the inner control rod 8 in the tool fall into the tail pipe.

[0069] After the pressure is released, the oil pump works normally.

Claims

1. An adjustable pump bottom pressure control device, characterized by: The fixed valve cover (1), the fixed valve seat joint (2) and the pressure control device outer cylinder (3) are connected in sequence from top to bottom, and the hollow structure forms a liquid passage; The fixed valve cover (1) is provided with a blocking piece for blocking the opening above the fixed valve seat joint (2); The pressure control device outer cylinder (3) is internally connected with a pressure control body (15), the pressure control body (15) is attached to the inner wall of the pressure control device outer cylinder (3), and the liquid passage of the pressure control device outer cylinder (3) is blocked; A control rod hole is formed in the pressure control body (15), an inner control rod outer cylinder (5) is connected in the control rod hole, an inner control rod (8) is threadedly connected in the inner control rod outer cylinder (5), an end head (11) is connected to the upper end of the inner control rod (8), and the end head (11) extends into the liquid passage of the fixed valve cover (1).

2. An adjustable pump base pressure control device according to claim 1, wherein: A raised limiting step is arranged on the inner wall of the pressure control device outer cylinder (3) above the pressure control body (15), and is used for limiting the pressure control body (15).

3. The adjustable pump base pressure control device of claim 1, wherein: The blocking piece is a valve ball (10), and the height and width of the hollow liquid passage in the fixed valve cover (1) are greater than the diameter of the valve ball (10).

4. The adjustable pump base pressure control device of claim 3, wherein: The valve ball (10) is matched with the size of the opening above the fixed valve seat joint (2), and is used for blocking the communication port between the fixed valve seat joint (2) and the fixed valve cover (1).

5. The adjustable pump base pressure control device of claim 1, wherein: A shear pin (14) is arranged on the pressure control device outer cylinder (3), and the shear pin (14) is connected between the pressure control device outer cylinder (3) and the pressure control body (15).

6. An adjustable pump base pressure control device as defined in claim 1, wherein: A control rod sealing ring (12) is arranged in the control hole of the pressure control body (15), and is used for sealing the inner wall of the pressure control body (15) and the outer wall of the inner control rod outer cylinder (5); a pressure control body sealing ring (13) is arranged on the outer wall of the pressure control body (15), and is used for sealing the outer wall of the pressure control body (15) and the inner wall of the pressure control device outer cylinder (3).

7. An adjustable pump base pressure control device as defined in claim 1, wherein: A control rod gland (17) is further arranged outside the inner control rod outer cylinder (5), and a tightening pin (4) and a tightening pin (6) are further connected to the control rod gland (17).

8. An adjustable pump base pressure control device according to claim 7, wherein: A locking nut (18) is further threadedly connected to the inner control rod (8) below the control rod gland (17).

9. An adjustable pump base pressure control device according to claim 8, wherein: A locking pin (7) is further arranged on the locking nut (18), and the locking pin (7) is fixedly connected to the inner control rod (8) through the locking nut (18).

10. The adjustable pump base pressure control device of claim 1, wherein: An inner control rod sealing ring (16) is arranged on the inner control rod (8) in the inner control rod outer cylinder (5).

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