On-site mixing device for displacement type well killing fluid

Abstract

The utility model provides an on-site mixing device for a driving and discharging type kill fluid, which comprises a mixing tank, a circulating pump, a three-way valve, a stock solution feeding pipe, a water inlet pipe, a liquid outlet pipe and a circulating pipeline, the stock solution feeding pipe, the water inlet pipe, the liquid outlet pipe and the circulating pipeline are communicated with the mixing tank, and the circulating pump is arranged on the circulating pipeline; a first connector of the three-way valve is communicated with the output end of the liquid outlet pipe, a second connector of the three-way valve is communicated with the input end of the circulation pipeline, and a third connector of the three-way valve is used for being externally connected with an output pipeline. The on-site mixing device for the displacement type well killing fluid has the advantages of scientific design, capability of diluting on site, low transportation cost and high practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well exploitation, in particular to an on-site mixing device for well-killing fluid of a displacement type. Background Art

[0002] During the oil well exploitation process, the pressure of water flow in the rock formation or the emulsion formed by the mixture of oil and water may block the entry of the oil well exploitation fluid, resulting in water lock. This will affect oil extraction and reduce oil recovery rate. In order to relieve the water lock phenomenon, a common method is to inject a displacement agent into the well. The displacement agent can change the wettability of the rock surface of the formation, reduce the tension of the oil-water interface, and disperse the clumps formed by colloid, asphaltene and wax in the crude oil, thereby achieving the purpose of unblocking.

[0003] At present, when injecting displacement agents into the well, the displacement agent concentrate is generally prepared into displacement agent dilution liquid in the factory, and then it is transported to the oil well site by tank trucks. However, the ratio of the displacement agent concentrate to water when diluting the displacement agent is about 1:10. The transportation cost of this method is relatively high, especially in Xinjiang where the distance is long and the road conditions are poor, which further increases the transportation cost.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The utility model aims to provide a field mixing device for well-killing fluid of displacement type with scientific design, low transportation cost and strong practicability in view of the deficiencies of the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a field mixing device for displacement type well-killing fluid, including a mixing tank, a circulating pump, a three-way valve, and a raw liquid feed pipe, a water inlet pipe, a liquid outlet pipe and a circulating pipeline connected to the mixing tank, the circulating pump is arranged on the circulating pipeline; the first interface of the three-way valve is connected to the output end of the liquid outlet pipe, the second interface of the three-way valve is connected to the input end of the circulating pipeline, and the third interface of the three-way valve is used for an external output pipeline.

[0007] Based on the above, the raw liquid feed pipe is connected to the top of the mixing tank, the water inlet pipe is connected to the bottom of the mixing tank, and the input end of the liquid outlet pipe and the output end of the circulation pipeline are respectively connected to the two ends of the mixing tank in the horizontal direction.

[0008] Based on the above, a level meter for monitoring the liquid level in the tank is arranged on the side of the mixing tank.

[0009] Based on the above, a maintenance manhole is provided on the top of the mixing tank, and a ladder is provided on the side of the mixing tank.

[0010] Based on the above, a base frame is also provided at the bottom of the mixing tank, and wheels and lifting legs are respectively provided at the four corners of the base frame. The lifting legs are located outside the wheels, and the wheels are placed on or off the ground by lifting the lifting legs.

[0011] The utility model has substantial features and progress compared with the prior art. Specifically, the utility model is provided with a mixing tank, a displacement agent stock solution is introduced through the stock solution feed pipe, tap water is introduced through the water inlet pipe, the first interface and the second interface of the three-way valve are connected, the third interface is closed, the circulation pump is turned on, and mixing is achieved by the circulation flow of the solution. After a period of circulation, the first interface and the third interface of the three-way valve are connected again, and the second interface is closed, and the diluted displacement agent well-killing fluid is discharged and then pumped into the oil well; when the diluted displacement agent well-killing fluid is emptied, the displacement agent stock solution and tap water are input into the mixing tank again, the circulation pump is turned on to mix them, and the circulation operation is performed until the displacement agent well-killing fluid is completely injected; the utility model has the advantages of scientific design, ability to be diluted on site, low transportation cost, and strong practicality.

[0012] Furthermore, the expellant concentrate is introduced from the top and tap water is introduced from the bottom, and the processes are circulated in the horizontal direction. The movement line is reasonable, and the whole system is mixed more fully during the flow, thereby shortening the mixing time. The setting of the liquid level meter facilitates the observation of the liquid level in the mixing tank. The setting of the inspection manhole facilitates the inspection of the inside of the tank, and the ladder facilitates the staff to disassemble and install the expellant concentrate input pipe. By providing the lifting legs, the mixing tank can be propped up when arriving at the work station, so that the support is more stable, and the wheels can be put on the ground when it needs to be moved, so that it is easier to push. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stereoscopic diagram of a field mixing device for well-killing fluid of medium displacement type according to the utility model.

[0014] Figure 2 It is a front view of the on-site mixing device of the medium displacement type well-killing fluid of the utility model.

[0015] Figure 3 It is a top view of the on-site mixing device of the medium displacement type well-killing fluid of the utility model.

[0016] In the figure: 1. Mixing tank; 2. Circulation pump; 3. Three-way valve; 4. Raw liquid feed pipe; 5. Water inlet pipe; 6. Liquid outlet pipe; 7. Circulation pipeline; 8. Liquid level meter; 9. Inspection manhole; 10. Ladder; 11. Base frame; 12. Wheels; 13. Lifting legs. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0018] like Figure 1-3 As shown, a field mixing device for well-killing fluid of displacement agent type comprises a mixing tank 1, a circulating pump 2, a three-way valve 3, and a raw liquid feed pipe 4, a water inlet pipe 5, a liquid outlet pipe 6 and a circulating pipeline 7 connected to the mixing tank 1, wherein the circulating pump 2 is arranged on the circulating pipeline 7; the raw liquid feed pipe 4 is connected to the top of the mixing tank 1, and is externally connected to the raw liquid input pipe of the displacement agent, and enters the tank from the top; the water inlet pipe 5 is connected to the bottom of the mixing tank 1, and is externally connected to the tap water pipe, and enters the tank from the bottom; the input end of the liquid outlet pipe 6 and the output end of the circulating pipeline 7 are respectively connected to the two ends of the mixing tank 1 in the horizontal direction, the first interface of the three-way valve 3 is connected to the output end of the liquid outlet pipe 6, the second interface of the three-way valve 3 is connected to the input end of the circulating pipeline 7, and the third interface of the three-way valve 3 is used for external output pipeline. By switching the connection state of the three interfaces, the self-circulation or drainage of the liquid in the tank can be realized.

[0019] In order to facilitate observation of the liquid level in the tank, a liquid level meter 8 for monitoring the liquid level in the tank is provided on the side of the mixing tank 1. A maintenance manhole 9 is also provided on the top of the mixing tank 1 for convenient maintenance. A ladder 10 is provided on the side of the mixing tank 1. When the staff climbs to the top of the tank from the ladder 10, they can conveniently disassemble the displacement agent raw liquid input pipe, and can also conveniently enter the tank from the maintenance manhole 9 for maintenance.

[0020] A base frame 11 is also provided at the bottom of the mixing tank 1, and wheels 12 and lifting legs 13 are respectively provided at the four corners of the base frame 11. The lifting legs 13 are located outside the wheels 12. The lifting legs 13 can be lifted and lowered by a screw structure. The wheels 12 can be lifted and lowered by lifting and lowering the lifting legs 13. It is easier to push when it is lifted and easier to support when it is lifted and lowered.

[0021] Working principle:

[0022] The on-site mixing device is transported to the oil well operation site, the tank truck loaded with the displacement agent stock solution is connected to the stock solution feed pipe 4 through the displacement agent stock solution input pipe, the on-site tap water pipe is connected to the water inlet pipe 5, and the third interface of the three-way valve 3 is connected to the output pipeline. In order to facilitate metering, a flow meter can also be set on the stock solution feed pipe 4 and the water inlet pipe 5; the first interface and the second interface of the three-way valve 3 are connected, and the third interface is closed, and the circulation pump 2 is turned on to achieve mixing by the circulation flow of the solution. After circulating for a period of time, the first interface and the third interface of the three-way valve 3 are connected again, and the second interface is closed, and the diluted displacement agent well-killing fluid is discharged and pumped into the oil well; when the diluted displacement agent well-killing fluid is emptied, the displacement agent stock solution and tap water are input into the mixing tank 1 again, and the circulation pump 2 is turned on to mix them, and the cycle operation is performed until the displacement agent well-killing fluid is injected.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A field mixing device for a flooding type well killing fluid, characterized in that: It includes a mixing tank, a circulation pump, a three-way valve, and a raw liquid feed pipe, a water inlet pipe, a liquid outlet pipe and a circulation pipeline connected to the mixing tank, wherein the circulation pump is arranged on the circulation pipeline; the first interface of the three-way valve is connected to the output end of the liquid outlet pipe, the second interface of the three-way valve is connected to the input end of the circulation pipeline, and the third interface of the three-way valve is used for an external output pipeline; the raw liquid feed pipe is connected to the top of the mixing tank, the water inlet pipe is connected to the bottom of the mixing tank, and the input end of the liquid outlet pipe and the output end of the circulation pipeline are respectively connected to the two ends of the mixing tank in the horizontal direction.

2. The on-site mixing device for the displacement type well killing fluid according to claim 1, characterized in that: A liquid level meter for monitoring the liquid level in the tank is arranged on the side of the mixing tank.

3. The on-site mixing device for the displacement type well killing fluid according to claim 1 or 2, characterized in that: A maintenance manhole is arranged on the top of the mixing tank, and a ladder is arranged on the side of the mixing tank.

4. The on-site mixing device for the displacement type well killing fluid according to claim 3 is characterized in that: A base frame is also provided at the bottom of the mixing tank, and wheels and lifting legs are respectively provided at the four corners of the base frame. The lifting legs are located outside the wheels, and the wheels are placed on or off the ground by lifting the lifting legs.

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