CN207437034U - Working fluid injection device based on pumping unit - Google Patents

Abstract

The utility model discloses a well-fluid injection device based on a pumping unit, which comprises a pumping unit, a casing, and an oil pipe. An annular passage is formed between the oil pipe and the casing, and a first tubular pump is arranged inside the oil pipe. The upper end of the oil pipe is detachably provided with an injection pipe, and a second tubular pump or a simple pump is arranged in the said injection pipe, and the first tubular pump, the second tubular pump or the simple pump are connected to each other through the sucker rod. The pumping unit is connected, and the injection pipe is also connected with a well fluid injection pipe, and the well fluid injection pipe extends along the annular passage to the well fluid connection pipe. The injection device uses the pumping unit's own power system to inject the well fluid into the formation, which can replace the application of a whole set of special operation vehicles or equipment when the well fluid is injected, greatly reducing the energy consumption and construction costs of the operation, and can also realize the injection displacement and The liquid production rate is the same, which meets the requirements of selective treatment of small displacement. The whole process can meet various needs, with strong operability and wide application range.

Description

Well fluid injection device based on pumping unit

technical field

The utility model relates to an oil recovery measure technology in an oil field, in particular to a well fluid injection device based on a pumping unit.

Background technique

During the long-term exploitation of oilfields, oil and water wells will have many problems that are not conducive to crude oil production. Especially in the middle and late stages of development, oil and water wells are frequently taken measures, such as profile control, water plugging, huffing and puffing, etc., which require timely maintenance and measures for oil and water wells Operation. Conventional measures such as profile control, water shutoff, polymer injection, and huff and puff need to pump the liquid from the ground to the formation. However, the injection of the treatment fluid is fast, which can easily lead to problems such as high construction pressure and pollution of non-target layers, thereby affecting the production of oil wells. Therefore, the small displacement and mild injection method is an important technology to protect the oil layer and increase the production of oil well measures.

At present, the downhole oil pumping device is generally shown in Figure 3, including a pumping unit arranged on the ground, a casing arranged in the formation, and an oil pipe sleeved in the casing. The inner bottom of the oil pipe is provided with a screen pipe and A plug is provided in the oil pipe and above the screen pipe. The pipe pump is connected to the pumping unit through a sucker rod. An annular passage is formed between the oil pipe and the casing. The annular One end of the channel is provided with a connection pipe for entering the well fluid, which is often connected to a special operation vehicle (cement truck or fracturing vehicle), a high-pressure plunger pump (such as a profile control pump) to provide power, and the well fluid is injected into the wellbore and Strata. These two methods of providing power have their own advantages and disadvantages: first, the special operation vehicle is powered by a diesel engine to drive the pump, and has a large displacement, generally above 18m ³ /h, which is only suitable for short-term injection operations and cannot be operated for a long time; Second, the high-pressure plunger pump is powered by the power system to drive the pump to work. The controllable displacement is 5-12m ³ /d. It requires high-power transformers, cables, and a large flat hard well site, which is suitable for medium and long-term construction . However, these two methods all have problems such as high energy consumption, high cost, heavy workload, poor mobility, and high requirements on conditions such as well sites, roads, and weather; meanwhile, compared with most low-yield oil wells (the daily liquid production volume is only a few square meters ), the injection displacement is obviously too large, and it is easy to pollute the oil layer, especially for chemical profile control or water plugging. Due to the large displacement, it is easy to cause accidents such as blocking the oil layer.

Utility model content

Aiming at the deficiencies of the existing technology, the utility model provides a well fluid injection device based on the pumping unit. The injection device uses the power system of the pumping unit to inject the well fluid into the formation, and performs some oil well maintenance and measure transformation, which can replace The application of a complete set of special operating vehicles or equipment greatly reduces energy consumption and construction costs, and can also achieve the same injection displacement and liquid production speed, meeting the requirements for selective treatment of small displacements. The entire process can meet various needs. The construction is safer, simpler, more economical, more efficient, more operable, and has a wider range of applications.

In order to achieve the above object, the technical scheme that the utility model takes:

The well fluid injection device based on the pumping unit includes a pumping unit, a casing, and an oil pipe arranged in the casing. The bottom end of the oil pipe is provided with a plug and a screen in turn, and the oil pipe and the casing are formed between the oil pipe and the casing. An annular channel, the other side of the upper end of the oil pipe is provided with a liquid production outlet pipe, one end of the annular channel is provided with a well fluid connection pipe, and a first tubular pump is provided in the oil pipe and above the screen pipe, The upper end of the oil pipe is detachably connected with a well fluid injection part, the well fluid injection part includes an injection pipe detachably arranged at the upper end of the oil pipe, one side of the upper end of the injection pipe communicates with the annular channel, and the injection pipe There is a seal between the oil pipe and the second pipe pump or simple pump in the injection pipe, and the first pipe pump, the second pipe pump or the simple pump are all connected by the sucker rod and the pump. The oil machine is connected, and the injection pipe is also connected with the well fluid injection pipe, and the well entry fluid injection pipe extends along the annular channel to the well fluid connection pipe.

As a preferred technical solution, in order to prevent the end of the well fluid injection pipe from being damaged by pressure or impact, improve the impact strength of the well fluid injection pipe, and ensure the normal progress of well fluid injection, the end of the well fluid injection pipe is connected to a Hitting the connector or connector protector.

As an optimal technical solution, in order to ensure a tight seal between the injection pipe and the oil pipe, prevent the well fluid from entering the oil pipe from the injection pipe, affect the normal injection of the well fluid, reduce the injection efficiency, and ensure easy installation and disassembly, the seal is set as an intermediate seal short section.

Compared with the prior art, the utility model has the beneficial effects:

1. The injection device uses the pumping unit's own power system to inject the well fluid into the formation, and performs some oil well maintenance and measure transformation. It can replace the application of the whole set of special operation vehicles or equipment when the well fluid is injected, which greatly reduces the energy consumption of the operation and construction. cost, and it can also achieve the same injection displacement and liquid production speed, which meets the requirements of selective treatment of small displacement. The whole process can meet various needs. wide.

2. The end of the well fluid injection pipe is connected with an anti-collision joint or joint protection device, which can effectively prevent the end of the well fluid injection pipe from being damaged by pressure or impact, improve the impact resistance of the well fluid injection pipe, and ensure the normal injection of well fluid conduct.

3. The seal is set as a nipple with intermediate seal to ensure a tight seal between the injection pipe and the oil pipe, prevent the well fluid from entering the lower oil pipe from the injection pipe, ensure the normal injection of the well fluid, improve the injection efficiency, and ensure the convenience of installation and disassembly.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a kind of structural representation of the utility model;

Fig. 3 is a structural schematic diagram of an existing well fluid injection device;

Reference numerals: 1. Pumping unit, 2. Casing, 3. Oil pipe, 4. Screen pipe, 5. Plug, 6. Annular channel, 7. Connecting pipe for entering well fluid, 8. First tubular pump, 9 , injection pipe, 10, seal, 11, second tubular pump, 12, simple pump, 13, sucker rod, 14, well fluid injection pipe, 15, anti-collision joint, 16, hydraulic anchor, 17, resistant Pressure blowout prevention box, 18, special operation vehicle, 19, high-pressure plunger pump, 20, well entry liquid tank.

Detailed ways

As shown in Figure 1, a specific embodiment of the utility model is proposed. The well fluid injection device based on the pumping unit includes a pumping unit 1 arranged on the ground, a casing 2 arranged in the formation, and a casing sleeved on the casing. The oil pipe 3 in 2, the oil pipe 3 is fixed in the casing 2 by the hydraulic anchor 16 on both sides of the oil pipe 3, the bottom end of the oil pipe 3 is provided with a screw plug 5 and a screen pipe 4 in sequence, and the oil pipe 3 3 and the casing 2 form an annular passage 6, which is controlled by a gate. One end of the annular passage 6 is provided with a well fluid connection pipe 7. In the oil pipe 3 and above the screen pipe 4, a first pipe type Pump 8, the upper end of the oil pipe 3 is detachably connected with a well fluid injection part, the well fluid injection part includes an injection pipe 9 detachably arranged on the upper end of the oil pipe 3, one side of the upper end of the injection pipe 9 is connected to the The annular channel 6 communicates with each other, and the other side of the upper end of the injection pipe 9 is provided with a liquid extraction pipe, which is connected to the next production process. A seal 10, the seal 10 is used to prevent the well fluid injected into the injection pipe 9 from entering the tubing 3, the injection pipe 9 is provided with a second tubular pump 11 or a simple pump 12, and the first tubular pump The pump 8, the second tubular pump 11 or the simple pump 12 are all connected to the pumping unit 1 through the sucker rod 13. The first tubular pump 8 is the original production pump and is used for normal oil production. The second tubular pump 11 or the simple pump 12 is the injection device. When it works, the original production pump stops working. The injection pipe 9 is also provided with a well fluid injection pipe 14. The well fluid injection pipe 14 extends along the annular channel 6 to the well fluid connection pipe 7. , the difference between this injection device and the original tubing string diagram is that the upper end of the crude oil pipe 3 and the sucker rod 13 is removed at the upper end of the crude oil pipe, and the original well fluid injection parts are connected, then the top of the injection pipe 9 is the same as the crude oil pipe, A pressure-resistant blowout prevention box 17 is provided, and one side of the injection pipe 9 is also provided with a pipeline entering other production processes.

The simple pump 12 of this embodiment is shown in Figure 2. The structure of the simple pump 12 is the same as that of the tube pump, except that the lower fixed valve is missing. Its working principle is the same as that of the tube pump. When the valve is closed, the pressure in the pump barrel drops, and the liquid enters the pump from the tank along the hollow pipe, and at the same time, the liquid on the pump enters the annulus of the oil casing along the way, and enters the target layer from the casing; or enters the adjacent well for profile control, Water blocking; downstroke: the piston moves downward, the pressure in the pump cylinder rises, the upper swimming valve opens, the liquid is discharged from the pump to the oil pipe above the piston, and the upper part of the pump discharges the liquid volume entered by the polished rod. The use of simple pumps is not only low in cost, but also can use bad pumps due to the sealing problem of the fixed valve at the lower part of the pump to reduce production costs.

The end of the well-fluid injection pipe 14 is connected with an anti-collision joint 15 or a joint protection device, which can effectively prevent the end of the well-fluid injection pipe 14 from being damaged by pressure or impact, improve the impact resistance of the well-fluid injection pipe 14, and ensure the Injection is performed normally.

The seal 10 is set as a nipple with a middle seal to ensure a tight seal between the injection pipe 9 and the oil pipe 3, effectively preventing the well fluid from entering the lower oil pipe from the injection pipe, ensuring the normal injection of the well fluid into the well, and ensuring the injection efficiency. Facilitate the recovery of production.

When the utility model is in use: first stop the oil production, as shown in Figure 3, the upper end of the oil pipe 3 and the sucker rod 13 is removed, connect the well fluid injection parts of the present invention, adjust the balance, start pumping again, and test the pressure. Connect the tank fluid into the well fluid injection pipe 14, and the second tubular pump 11 or simple pump 12, driven by the pumping unit 1, injects the well fluid into the annular channel 6, and then enters the target oil layer. After entering the well fluid, remove the well fluid injection parts, restore the original pipeline, and start the well for production again.

Of course, the above is only a detailed description of the preferred embodiment of the utility model in conjunction with the accompanying drawings, and is not intended to limit the scope of implementation of the utility model. All equivalent changes made according to the principle, structure and structure of the utility model shall be Covered within the protection scope of the present utility model.

Claims (3)

1. The well fluid injection device based on the pumping unit, including the pumping unit (1), the casing (2), the oil pipe (3) sleeved in the casing (2), and the bottom of the oil pipe (3) A plug (5) and a screen (4) are arranged at the end in turn, and an annular channel (6) is formed between the tubing (3) and the casing (2), and one end of the annular channel (6) is provided with a well fluid Connecting pipe (7), a first tubular pump (8) is arranged in the oil pipe (3) and above the screen pipe (4), and it is characterized in that: the upper end of the oil pipe (3) is detachably connected with a A well fluid injection part, the well fluid injection part includes an injection pipe (9) detachably arranged on the upper end of the tubing (3), and one side of the upper end of the injection pipe (9) communicates with the annular channel (6) , a seal (10) is provided between the injection pipe (9) and the oil pipe (3), and a second tubular pump (11) or a simple pump (12) is provided in the injection pipe (9), And the first tubular pump (8), the second tubular pump (11) or the simple pump (12) are all connected with the pumping unit (1) through the sucker rod (13), and the injection pipe (9) It is also connected with a well fluid injection pipe (14), and the well fluid injection pipe (14) extends along the annular channel to the well fluid connection pipe (7). 2. The pumping unit-based well fluid injection device according to claim 1, characterized in that: the end of the well fluid injection pipe (14) is connected with an anti-collision joint (15). 3. The pumping unit-based well fluid injection device according to claim 1 or 2, characterized in that: the seal (10) is set as a short-circuit of the intermediate seal.