Oil field negative pressure control and sleeve control collection device

Abstract

The utility model discloses an oil field negative pressure control and sleeve control collecting device which comprises a main cylinder, a piston rod on the main cylinder is hinged to an oil beam of an oil pumping unit, a main cylinder air inlet of the main cylinder is connected with an oil well sleeve air pipe, the main cylinder air inlet of the main cylinder is provided with a first one-way valve, and a main cylinder air outlet of the main cylinder is provided with a second one-way valve. An auxiliary cylinder air inlet of the auxiliary cylinder is connected with a main cylinder air outlet of the main cylinder, and an auxiliary cylinder air outlet of the auxiliary cylinder is communicated with an oil well oil conveying pipeline; a vertical partition plate is fixed to the bottom wall of an auxiliary cavity of the auxiliary cylinder and divides the auxiliary cavity into a first cavity communicated with an air inlet of the auxiliary cylinder and a second cavity communicated with an air outlet of the auxiliary cylinder, and a gap used for communicating the first cavity with the second cavity is formed between the upper end of the vertical partition plate and the top wall of the auxiliary cavity. And a plurality of pressure flow plates which are staggered up and down are fixed on the first chamber, the second chamber and the vertical partition plate. The device utilizes the main cylinder and the auxiliary cylinder to pressurize casing gas for multiple times, the pressure difference between an oil pipeline and the interior of a well is greatly increased, and then the collecting effect of increasing oil and increasing gas rate is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield equipment, and more specifically, to an oilfield negative pressure pressure control and casing pressure control collection device. Background Art

[0002] The pumping of oil uses a pumping unit. When the pumping unit pumps oil, the oil flows out from the production tubing, and the casing gas (or called associated gas in the oil well, natural gas in the oil well) is collected and flows out in the oil well casing. Some existing devices can completely recover the associated gas / casing gas in the oilfield, pressurize the gas together with the carried liquid to the tubing transportation pressure, make full use of the existing oil transportation pipeline, and mix and transport it with the crude oil to the downstream centralized treatment, without the need for gas-liquid separation during the process. At the same time, the device has the function of "automatic casing pressure control", automatically controlling the appropriate casing pressure and the height of the dynamic liquid level, matching the most suitable formation back pressure, the best pump efficiency and stable crude oil production. The product is suitable for low-cost production increase in low-yield and low-permeability oilfields.

[0003] After retrieval, it is found that the existing patent with the publication number CN2526535Y and the name of piston type oil well gas pump is used in conjunction with a conventional beam type pumping unit, sucks the gas in the oil well casing, and recovers the natural gas through the inlet pipeline. Specifically, due to the operation of the gas pump, the casing pressure of the oil well is greatly reduced, thereby reducing the back pressure of the casing gas on the oil layer, and then generating a large production pressure difference, increasing the formation liquid level and the filling coefficient of the sucker rod pump, achieving the purpose of increasing the oil well output and recovering the casing gas. In addition, for other existing technologies for improving the oil and gas production rate by setting a pressurization device at the wellhead, reference can also be made to some other existing technologies, such as CN102747989B - oil well casing gas collection device, CN202755949U - a cylinder type wellhead pressurization device.

[0004] However, the above existing technologies only use the piston moving up and down to pressurize the gas, and their pressurization ability is limited, and the oil and gas production efficiency still needs to be improved.

[0005] Therefore, how to provide an oilfield negative pressure pressure control and casing pressure control collection device that can improve the oil and gas production efficiency is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0006] In view of this, the utility model provides an oilfield negative pressure pressure control and casing pressure control collection device that can improve the oil and gas production efficiency.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An oilfield negative pressure pressure control and casing pressure control collection device, comprising:

[0009] A master cylinder, which is hinged to a pumping unit. A piston rod of the master cylinder is hingedly connected to a walking beam of the pumping unit. A master cylinder air inlet of the master cylinder is connected to a casing gas pipe of an oil well through a first pipeline. A first check valve for one-way inflow of casing gas into a main chamber of the master cylinder is provided on the master cylinder air inlet of the master cylinder. A second check valve for one-way outflow of casing gas from the main chamber is provided on a master cylinder air outlet of the master cylinder;

[0010] A slave cylinder, which is fixed on the pumping unit. A slave cylinder air inlet of the slave cylinder is connected to the master cylinder air outlet of the master cylinder through a second pipeline. A slave cylinder air outlet of the slave cylinder is communicated with an oil well oil transmission pipeline through a pipeline;

[0011] Wherein, a vertical partition is fixed on a bottom wall of a slave chamber of the slave cylinder. The vertical partition divides the slave chamber into a first chamber communicated with the slave cylinder air inlet and a second chamber communicated with the slave cylinder air outlet. A gap for communicating the first chamber and the second chamber is provided between an upper end of the vertical partition and a top wall of the slave chamber. A plurality of vertically staggered flow pressing plates are fixed on an inner wall of the first chamber, an inner wall of the second chamber and an outer wall of the vertical partition.

[0012] It can be seen from the above technical solutions that, compared with the prior art, the present utility model discloses an oilfield negative pressure pressure control and casing gas collection device. When the walking beam of the pumping unit moves upward, the walking beam drives the piston rod of the master cylinder to move upward, sucking the casing gas (or called oil well associated gas, oil well natural gas) in the casing gas pipe of the oil well into the main chamber through the master cylinder air inlet, and then driving the piston rod to move downward by the downward movement of the walking beam, compressing the casing gas inside the master cylinder and pressing it to the slave cylinder air inlet, so that the casing gas enters the first chamber, and after being pressurized by the stacked and staggered flow pressing plates inside, it is pressed into the oil well oil transmission pipeline through the second chamber and the slave cylinder air outlet and transported together with the crude oil. Therefore, the device adopts the method of primary pressurization of the casing gas by the master cylinder and secondary pressurization by the flow pressing plates in the slave cylinder to increase the pressure of the casing gas finally entering the oil well oil transmission pipeline, having the effects of reducing the casing pressure of the wellhead casing gas pipe, increasing the production pressure difference in the well, raising the oil layer liquid level, accelerating the oil return speed and the casing gas collection efficiency, thereby achieving the effects of increasing oil production and the gas production rate of the oil well.

[0013] Further, the volume of the second chamber is smaller than the volume of the first chamber.

[0014] The beneficial effects of adopting the above technical solutions are as follows: When the casing gas flows from the first chamber with a large volume through the second chamber with a small volume, the pressure of the casing gas will be further increased. Therefore, the slave cylinder not only pressurizes the casing gas through the stacked flow pressing plates, but also uses the change of volume to pressurize the casing gas again, thereby realizing the double pressurization effect of the casing gas with a single slave cylinder, not only reducing the number of pressurization components used, making the overall structure of the device simple and the cost low, but also greatly improving the pressurization effect of the casing gas.

[0015] Further, a third one-way valve for allowing casing gas to flow into the first chamber unidirectionally is provided at the intake port of the sub-cylinder, and a fourth one-way valve for allowing casing gas to flow out of the second chamber unidirectionally is provided at the outlet port of the sub-cylinder.

[0016] The beneficial effects of adopting the above technical solution are as follows: the casing gas entering the first chamber cannot flow out reversely through the intake port of the sub-cylinder, and the pressurized casing gas cannot flow into the second chamber reversely through the outlet port of the sub-cylinder, ensuring that the casing gas always enters through the intake port of the sub-cylinder and flows out through the outlet port of the sub-cylinder, and avoiding the problem of low recovery rate of casing gas caused by the backflow of pressurized casing gas.

[0017] Further, a main-cylinder vent valve for venting the casing gas inside the main chamber is installed on the main cylinder, and a sub-cylinder vent valve for venting the casing gas inside the sub-chamber is installed on the sub-cylinder.

[0018] The beneficial effects of adopting the above technical solution are as follows: when boosting collection is not required, the main-cylinder vent valve and the sub-cylinder vent valve are used to quickly vent the casing gas in the main cylinder and the sub-cylinder, avoiding the danger caused by the presence of casing gas in the main cylinder and the sub-cylinder.

[0019] Further, a gas shut-off device is also provided at the intake port of the sub-cylinder, and a gas locking device is also provided at the outlet port of the sub-cylinder.

[0020] The beneficial effects of adopting the above technical solution are as follows: the gas shut-off device enables the casing gas to enter the sub-chamber normally, while the gas locking device can lock the gas from being discharged through the outlet port of the sub-cylinder, that is, only allowing the casing gas to enter the sub-chamber and not to exit. As the pressure inside the sub-chamber reaches a certain value, the gas shut-off device automatically closes the intake port of the sub-cylinder, preventing the casing gas from flowing back out of the intake port of the sub-cylinder. This plays a role in increasing the pressure on the casing gas inside the sub-chamber. At this time, the gas locking device opens the outlet port of the sub-cylinder, allowing the pressurized casing gas to be discharged into the oil well transmission pipeline. As the casing gas in the sub-cylinder is discharged, the internal pressure decreases, and the gas shut-off device opens the intake port of the sub-cylinder again, and the gas locking device closes the intake port of the sub-cylinder again to continue boosting the casing gas flowing into the sub-cylinder. Therefore, through the gas shut-off device and the gas locking device, the aggregation and boosting of casing gas inside the sub-cylinder can be realized, further increasing the pressure of the casing gas, increasing the pressure difference between the oil well transmission pipeline and the well, and ultimately realizing the improvement of the oil and gas production rate. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0022] Figure 1 This is a schematic structural diagram of an oilfield negative pressure pressure control and casing collection device provided by the present utility model.

[0023] Figure 2 This is a schematic structural diagram of the main cylinder.

[0024] Figure 3 This is a schematic structural diagram of the auxiliary cylinder.

[0025] Figure 4 This is a schematic structural diagram of the airtight device.

[0026] Figure 5 This is a schematic structural diagram of the air locking device. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] The embodiment of the present utility model discloses an oilfield negative pressure pressure control and casing collection device, which is also an oilfield wellhead pressurization device, including:

[0029] A main cylinder 1, the main cylinder 1 is hinged on the pumping unit 2, the piston rod 11 of the main cylinder 1 is hingedly connected to the walking beam 21 of the pumping unit 2, the main cylinder air inlet 12 of the main cylinder 1 is connected to the oil well casing gas pipe 3 through a first pipeline 4, and a first one-way valve 5 for the casing gas to flow into the main chamber 13 of the main cylinder 1 unidirectionally is provided on the main cylinder air inlet 12 of the main cylinder 1, and a second one-way valve 6 for the casing gas to flow out of the main chamber 13 unidirectionally is provided on the main cylinder air outlet 14 of the main cylinder 1;

[0030] An auxiliary cylinder 7, the auxiliary cylinder 7 is fixed on the pumping unit 2, the auxiliary cylinder air inlet 71 of the auxiliary cylinder 7 is connected to the main cylinder air outlet 14 of the main cylinder 1 through a second pipeline 8, and the auxiliary cylinder air outlet 72 of the auxiliary cylinder 7 is communicated with the oil well oil pipeline through a pipeline;

[0031] Among them, a vertical partition 9 is fixed on the bottom wall of the auxiliary chamber 73 of the auxiliary cylinder 7. The vertical partition 9 divides the auxiliary chamber 73 into a first chamber 731 communicated with the auxiliary cylinder air inlet 71 and a second chamber 732 communicated with the auxiliary cylinder air outlet 72. A gap 74 for communicating the first chamber 731 and the second chamber 732 is provided between the upper end of the vertical partition 9 and the top wall of the auxiliary chamber 73. A plurality of pressure flow plates 10 arranged up and down in a staggered manner are fixed on the inner wall of the first chamber 731, the inner wall of the second chamber 732, and the outer wall of the vertical partition 9.

[0032] Through the laminated and staggered pressure flow plates 10, a shunt air passage is formed inside the auxiliary cylinder. That is, when the casing gas flows through these shunt air passages, since the force-bearing area of the casing gas in the shunt air passages is smaller than that of the entire auxiliary chamber, the pressure of the casing gas increases, thereby increasing the pressure entering the oil pipeline of the oil well, increasing the pressure difference between the oil pipeline and the oil pipe and the casing gas pipe of the oil well, and thus increasing the oil production and gas production rates.

[0033] In some embodiments, the volume of the second chamber 732 is smaller than the volume of the first chamber 731, so that the pressure of the casing gas flowing through the first chamber with a small volume further increases, increasing the pressure of the casing gas at the air outlet of the auxiliary cylinder.

[0034] A third one-way valve 15 for the one-way inflow of the casing gas into the first chamber 731 is provided on the air inlet 71 of the auxiliary cylinder, and a fourth one-way valve 16 for the one-way outflow of the casing gas from the second chamber 732 is provided on the air outlet 72 of the auxiliary cylinder.

[0035] A main cylinder vent valve 17 for venting the casing gas inside the main chamber 13 is installed on the main cylinder 1, and an auxiliary cylinder vent valve 18 for venting the casing gas inside the auxiliary chamber 73 is installed on the auxiliary cylinder 7.

[0036] An air shut-off device 19 is further provided on the air inlet 71 of the auxiliary cylinder, and a gas locking device 20 (a back pressure valve can be used) is further provided on the air outlet 72 of the auxiliary cylinder.

[0037] The air shut-off device 19 and the gas locking device 20 can also adopt the structure as shown in Figure 4 , Figure 5 The air shut-off device 19 (see Figure 4 ) has a first circular housing 191. Inside the first circular housing 191, there is a first circular partition 192. There are air holes on the first circular partition 192. The gas enters the inside of the first circular partition 192 through the air holes via the air inlet of the auxiliary cylinder, pushing the first circular partition 192 to shift laterally, that is, a part of the first pipe column spring 193 extends and a part contracts. At this time, the moving bead 194 shifts laterally. At this time, the air shut-off device connects the air inlet of the auxiliary cylinder and the first chamber, and the casing gas enters the first chamber through the air shut-off device. The gas enters the cylinder port and reaches a certain pressure in the first chamber, such as 17M. A part of the first pipe column spring 193 extends and a part contracts, and the moving bead 194 resets to close the air inlet of the auxiliary cylinder, preventing the gas from returning.

[0038] The gas locking device 20 (see Figure 5)There is a second circular housing 201. Inside the second circular housing 201, there are a second circular partition 202 and a third circular partition 203 (which is an elastic membrane). There are air holes on the second circular partition 202. The pressure of the gas inside the cylinder body compresses the spring 204, causing the second pipe column spring 205 to contract, pushing the third circular partition 203 to contract, and then causing multiple soft rubbers 206 arranged in a stacked manner to fold and hold the fixed bead 207 tightly. Finally, the air locking device closes the air outlet of the sub-cylinder, achieving pressure holding in the sub-cylinder. When the air pressure inside the sub-cylinder reaches a certain value, the soft rubber 206 expands outward, realizing the exhaust of the air outlet of the sub-cylinder.

[0039] This device collects the casing gas in the oil well, and after being pressurized once by the main cylinder and twice by the sub-cylinder, it is injected into the oil pipeline of the oil well, which can greatly increase the pressure difference between the oil pipeline and the well, thereby raising the liquid level of the oil layer, accelerating the oil return speed and the casing gas collection efficiency, and thus achieving the effects of increasing oil production and the gas production rate of the oil well.

[0040] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oilfield negative pressure pressure and casing pressure control acquisition device, characterized in that, Including: A main cylinder (1), the main cylinder (1) is hinged on a pumping unit (2), a piston rod (11) of the main cylinder (1) is hingedly connected to a beam (21) of the pumping unit (2), a main cylinder air inlet (12) of the main cylinder (1) is connected to a casing gas pipe (3) of an oil well through a first pipeline (4), a first check valve (5) for allowing casing gas to flow into a main chamber (13) of the main cylinder (1) unidirectionally is provided on the main cylinder air inlet (12) of the main cylinder (1), and a second check valve (6) for allowing casing gas to flow out of the main chamber (13) unidirectionally is provided on a main cylinder air outlet (14) of the main cylinder (1); A sub-cylinder (7), the sub-cylinder (7) is fixed on the pumping unit (2), a sub-cylinder air inlet (71) of the sub-cylinder (7) is connected to the main cylinder air outlet (14) of the main cylinder (1) through a second pipeline (8), and a sub-cylinder air outlet (72) of the sub-cylinder (7) is communicated with an oil well oil transmission pipeline through a pipeline; Wherein, a vertical partition plate (9) is fixed on a bottom wall of a sub-chamber (73) of the sub-cylinder (7), the vertical partition plate (9) divides the sub-chamber (73) into a first chamber (731) communicated with the sub-cylinder air inlet (71) and a second chamber (732) communicated with the sub-cylinder air outlet (72), a gap (74) for communicating the first chamber (731) and the second chamber (732) is provided between an upper end of the vertical partition plate (9) and a top wall of the sub-chamber (73), and a plurality of pressure flow plates (10) arranged vertically and staggered are fixed on an inner wall of the first chamber (731), an inner wall of the second chamber (732), and an outer wall of the vertical partition plate (9).

2. The oilfield negative pressure pressure and casing pressure control acquisition device according to claim 1, characterized in that A volume of the second chamber (732) is smaller than a volume of the first chamber (731).

3. The oilfield negative pressure pressure and casing pressure controlled acquisition device according to claim 1 or 2, characterized in that, A third check valve (15) for allowing casing gas to flow into the first chamber (731) unidirectionally is provided on the sub-cylinder air inlet (71), and a fourth check valve (16) for allowing casing gas to flow out of the second chamber (732) unidirectionally is provided on the sub-cylinder air outlet (72).

4. The oilfield negative pressure pressure and casing pressure controlled acquisition device according to claim 1 or 2, characterized in that A main cylinder vent valve (17) for venting casing gas inside the main chamber (13) is installed on the main cylinder (1), and a sub-cylinder vent valve (18) for venting casing gas inside the sub-chamber (73) is installed on the sub-cylinder (7).

5. A negative pressure controlled pressure and controlled casing acquisition device for an oilfield according to claim 1 or 2, characterized in that, An air closing device (19) is further provided on the sub-cylinder air inlet (71), and a gas locking device (20) is further provided on the sub-cylinder air outlet (72).

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