CN103288288B - Moveable well washing water wellhead circulation treatment apparatus - Google Patents

Abstract

The invention relates to a mobile well-flushing water wellhead circulation treatment device. The device processes the spit out of the water injection well on site, and after the treatment is qualified, it is directly reinjected by the high-pressure pump truck, and the crude oil spit out by the water injection well is collected and utilized, saving water and energy. The device includes two-stage reactions of flocculation and coagulation and one-stage oil recovery. Iron powder is added to the flocculation at the same time, and the flocs in the sewage are quickly settled and collected by magnetic adsorption, and the treated clean water is directly reinjected. The invention is mobile, driven by a DC motor, and does not need to rely on an external power source. It is especially suitable for field construction operations. It can treat the sewage spit out of the water injection well on site. After the treatment is qualified, it can be directly re-injected into the water injection well by a high-pressure pump truck, saving water for well washing. There is no need for the cost of tanker transportation, and it has the characteristics of fast processing speed, no power supply, multi-purpose machine, low processing cost and energy saving.

Description

Mobile well flushing water wellhead circulation treatment device

technical field

The invention relates to an oil field well flushing water treatment device, in particular to a mobile well flushing water wellhead circulation processing device.

Background technique

In the field of oilfield sewage treatment, the treatment of well flushing water has always been a difficult problem in oilfield sewage treatment. After a period of operation of oilfield water injection wells, it is necessary to use clean water to backwash the water injection wells. deterministic, and at the same time, a lot of crude oil may be spit out when the water injection well is depressurized, which brings certain difficulties to the treatment of well washing water and also causes a waste of resources. The tank truck is transported to the side of the water injection well, and at the same time cooperates with the high-pressure pump truck to backwash the water injection well. The sewage from the backwash needs to be transported to a designated place for centralized treatment, which wastes manpower and material resources and easily causes environmental accidents.

Contents of the invention

In order to overcome the deficiencies of the background technology, the present invention provides a mobile well flushing water wellhead circulation treatment device, which processes the discharge liquid of the water injection well on site, and directly re-injects it through the high-pressure pump truck after the treatment is qualified, and spits out the water from the injection well. The collection and utilization of crude oil reduces the task of tank trucks and saves water and energy.

The technical solution of the present invention is: the mobile well flushing water wellhead circulation treatment device includes a skid-mounted base, and each component of the device is fixedly connected to the skid-mounted base, wherein the outer surface of the cyclone separator placed on the skid-mounted base The round shoulder is connected to the water inlet pipe, the top center of the cyclone separator is connected to the overflow pipe, and the conical bottom of the cyclone separator is connected to the upper cylindrical shoulder of the reaction tank A through the series static mixer. There is an "S"-shaped tube at the bottom of A that is connected to the upper cylindrical shoulder of reaction tank B. The bottom of reaction tank B is connected with the bottom of the settling tank by a pipeline. It is connected to the inlet of the screw pump, and the outlet of the screw pump is connected with the outer wall of the waist of the sludge tank. There is a supernatant overflow pool on the outer edge of the wall of the sludge tank. The conical bottom of the sludge tank is equipped with a sludge magnetic adsorption area. , There is a clear water overflow pool along the outside of the barrel wall of the reaction tank B, and the clear water overflow pool is connected with the upper part of the water tank by a pipeline.

The above-mentioned reaction tank A and reaction tank B are both barrel-shaped thin-walled structures with an upper opening, and an agitator is placed in the center of the barrel-shaped, and both the settling tank and the sludge tank are barrel-shaped thin-walled structures with conical bottoms.

The above-mentioned supernatant overflow pool and clear water overflow pool are both ring-shaped water channels surrounded by "L"-shaped thin plates along the outside of the barrel wall. Among them, there is a return pipe at the bottom of the supernatant overflow pool leading to the reaction tank. A top.

The above-mentioned skid-mounted base is also equipped with a coagulant medicine box and a flocculant medicine box. The coagulant medicine box has a pipeline connected to the inlet of the metering pump B, and the outlet of the metering pump B is connected to the center of the pipe of the static mixer by a pipeline. The flocculant medicine box has a pipeline connected to the inlet of the metering pump A, and the outlet of the metering pump A has a pipeline connected to the center of the "S"-shaped pipe. The reaction tank A is equipped with a screw conveyor, and the screw conveyor The discharge port is located within the circumference range above the opening of the reaction tank A.

The aforementioned screw pump, metering pump A, metering pump B, screw conveyor and agitator are all driven by DC motors.

The above-mentioned sedimentation magnetic adsorption area and sludge magnetic adsorption area are filled with sheet-shaped NdFeB permanent magnets.

The invention has the following beneficial effects: the device firstly collects the crude oil spit out from the water injection well, avoiding the waste of energy, and by adding fine iron powder and coagulant to the sewage, the sewage can be destabilized quickly, increasing the stability of the sewage The specific gravity of the flocs, and then add flocculants to make the flocs containing iron powder grow rapidly by making full use of the bridging effect of the flocculants. Settling, the settled sludge is discharged into the sludge settling tank through the screw pump for storage, the sludge settles at the bottom through the magnetic adsorption area, and the supernatant returns to the front end. The device is mobile and driven by a DC motor without relying on an external power supply. , especially suitable for field construction operations. It can treat the sewage spit out of the water injection well on site. After the treatment is qualified, it can be directly re-injected into the water injection well by a high-pressure pump truck, saving water for well washing, and without the cost of tanker transportation. It has fast processing speed and no power supply. It can be used for multiple purposes, with low processing cost and energy saving features.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present invention.

In the figure 1-skid base, 2-flocculant tank, 3-metering pump A, 4-metering pump B, 5-coagulant tank, 6-inlet pipe, 7-cyclone separator, 8-reaction Tank A, 9-"S"-shaped pipe, 10-reaction tank B, 11-screw pump, 12-settling magnetic adsorption area, 13-water tank, 14-sludge tank, 15-sludge magnetic adsorption area, 16-outlet Mud pipe, 17-supernatant overflow tank, 18-return pipe, 19-settling tank, 20,-clean water overflow tank, 21-agitator, 22-screw conveyor, 23-static mixer, 24-overflow flow tube.

Detailed ways:

Below in conjunction with accompanying drawing, the present invention is further described: by shown in Figure 1, this device at first collects after the crude oil that water injection well spits out is separated through cyclone separator 7, has avoided the waste of energy, removes the sewage of crude oil through static mixer 23. Add coagulant and fully mix with sewage to form tiny flocs. By adding iron powder for powder metallurgy to sewage, after the reaction of reaction tank A8 and the stirring action of stirrer 21, iron powder due to its magnetic inhomogeneity and specific gravity The large feature makes the tiny flocs form tiny flocs around the iron powder particles, quickly destabilizes the sewage, increases the specific gravity of the flocs after the sewage is destabilized, and reacts through the stirring and mixing of the reaction tank B10 and the agitator 21, and then adds The flocculant makes the flocs containing iron powder grow up quickly by making full use of the bridging effect of the flocculant, and the grown flocs containing iron powder are in the settling tank 19, due to the action of the NdFeB permanent magnet in the magnetic adsorption area 12 of the sedimentation Rapid settlement, the settled sludge is discharged through the screw pump 11 into the sludge tank 14 for storage, the sludge is further concentrated and settled at the bottom through the sludge magnetic adsorption area 15, the supernatant is returned to the front end, and the upstream clean water of the settling tank 19 passes through the clean water The overflow pool 20 enters the water tank and is injected into the wellhead through a high-pressure pump truck to realize the circulation treatment of well washing water.

The mobile well flushing water wellhead circulation treatment device includes a skid-mounted base 1, and all parts of the device are fixedly connected to the skid-mounted base 1 to realize the purpose of moving the device. The outer circular shoulder of the separator 7 is connected with the water inlet pipe 6, and the center of the top of the cyclone separator 7 is connected with an overflow pipe 24 for collecting the crude oil flowing out of the overflow pipe of the cyclone separator 7, storing the collected crude oil, and operating After completion, it is transported to the joint station for recovery. The conical bottom of the cyclone separator 7 has a pipeline connected to the upper cylindrical shoulder of the reaction tank A8 through the series static mixer 23, and the bottom of the reaction tank A8 is connected with an "S"-shaped pipe 9. On the upper cylindrical shoulder of the reaction tank B10, the bottom of the reaction tank B10 is connected with the bottom of the settling tank 19 by a pipeline. The structural arrangement of the pipeline and the reaction tank makes the sewage enter the upper part of the reaction tank A8 or B10, and pass through the agitator. Stirring and a certain hydraulic retention time ensure the reaction time and stirring time of the agent and sewage;

The conical bottom of the settling tank 19 is equipped with a settling magnetic adsorption area 12. While the water flow is slowly rising, the magnetic attraction of the settling magnetic adsorption area 12 at the bottom of the settling tank 12 rapidly descends the flocs containing iron powder in the sewage and is adsorbed on the settling tank. The bottom of the box 19, the bottom of the settling box 19 is connected to the inlet of the screw pump 11, and the outlet of the screw pump 11 has a pipeline connected to the outer wall of the waist of the sludge tank 14, and the sludge enters the middle of the sludge tank, and the flocs containing iron powder are absorbed by gravity and magnetic Under the action, the clear liquid rises and the sludge is selected to enter in the middle of the sludge tank 14. On the one hand, under the pressure of the supernatant, the sludge slowly enters the sludge tank 14, and on the other hand, the fluid that the sludge enters will not Agitate the settled sludge, there is a supernatant overflow pool 17 on the outer edge of the wall of the sludge tank 14, a sludge magnetic adsorption area 15 is placed outside the conical bottom of the sludge tank 14, and the upper edge of the wall of the reaction tank B10 Clear water overflow pool 20 is arranged on the outside, and clear water overflow pool 20 has pipeline to communicate with water tank 13 tops.

The reaction tank A8 and the reaction tank B10 are both barrel-shaped thin-walled structures with an upper opening, and an agitator 21 is placed in the center of the barrel, and the settling tank 19 and the sludge tank 14 are both barrel-shaped thin-walled cone-shaped bottoms. Structure, the barrel structure can maximize the circumferential stirring effect of the agitator blades, the conical bottom structure can make the flocs containing iron powder gather together when they fall, and the bulk density increases, which is beneficial to reduce sludge. moisture content.

The supernatant overflow pool 17 and the clear water overflow pool 20 are both ring-shaped water channels surrounded by "L"-shaped thin plates along the outside of the barrel wall, wherein there is a return pipe at the bottom of the supernatant overflow pool 17 18 is connected to the upper part of the reaction tank A8.

The skid-mounted base 1 is also equipped with a coagulant medicine box 5 and a flocculant medicine box 2. The coagulant medicine box 5 has a pipeline connected to the inlet of the metering pump B4, and the outlet of the metering pump B4 is connected to the static mixing chamber by a pipeline. The coagulant solution is housed in the coagulant tank 5 in the pipe center of the device 23, and the coagulant is boosted into the static mixer 23 through the metering pump B4, and the sewage and the coagulant are fully Mixing and reaction enter the reaction tank A8, the flocculant tank 2 is connected to the inlet of the metering pump A3 by a pipeline, and the outlet of the metering pump A3 is connected to the center of the "S"-shaped tube 9 by a pipeline, and the flocculant tank 2 is filled with flocculant solution, the metering pump A3 boosts the flocculant into the center of the "S"-shaped pipe 9, so that the sewage added with the coagulant is fully mixed with the flocculant in the "S"-shaped pipe 9 and enters the reaction tank B11. A reaction tank A8 is provided with a screw conveyor 22 on it, and the outlet of the screw conveyor 22 is located within the circumference range above the opening of the reaction tank A8, and the material conveyed by the screw conveyor can enter along the maximum circumference of the reaction tank A8, fully The water flow at the maximum speed stirred by the agitator 21 in the reaction tank is fully mixed with the sewage.

The screw pump 11, the metering pump A3, the metering pump B4, the screw conveyor 22 and the agitator 21 are all driven by a DC motor, and the DC motor is driven by a storage battery without using an external power source, which expands the scope of use of the device and avoids Potential safety hazards brought by the use of automotive power take-offs and on-board engines.

The settling magnetic adsorption area 12 and the sludge magnetic adsorption area 15 are filled with sheet-shaped NdFeB permanent magnets, and the strong magnetism of the NdFeB permanent magnets is used to absorb the flocs containing iron powder to quickly settle and gather.

The material conveyed by the screw conveyor 22 is iron powder for powder metallurgy, the iron content of the iron powder for powder metallurgy is about 65%, and the particle size of the iron powder for powder metallurgy is between 200 and 250 mesh Iron powder for powder metallurgy with an iron content of 65% can meet the requirements of settling flocs containing iron powder and has low cost. The particle size of iron powder for powder metallurgy is too small, and its weight and magnetic properties will not produce obvious The role of the flow rate is very strict, and the problem of too large particle size is that the weight of the iron powder itself will break the bridging effect of the flocculant, and the self-settling of the flocs will lose its effect, and it will also make the addition of iron powder Dosage and cost have been greatly increased. Tests have shown that iron powder for powder metallurgy between 200 and 250 mesh is more suitable as a sedimentation additive for well washing water treatment.

The device is mobile, driven by a DC motor, and does not need to rely on an external power source. It is especially suitable for field construction operations. It can treat the sewage spit out of the water injection well on site. After the treatment is qualified, it is directly injected back into the water injection well by a high-pressure pump truck, saving water for well washing. There is no need for the cost of tanker transportation, and it has the characteristics of fast processing speed, no power supply, multi-purpose machine, low processing cost and energy saving.

Claims (7)

1. A mobile well-washing wellhead circulation treatment device, comprising a skid-mounted base (1), characterized in that: each component of the device is fixedly connected to the skid-mounted base (1), wherein, placed on the skid-mounted base ( 1) The outer circular shoulder of the cyclone separator (7) is connected to the water inlet pipe (6), the top center of the cyclone separator (7) is connected to the overflow pipe (24), and the cyclone separator (7) The conical bottom of the pipe is connected to the upper cylindrical shoulder of the reaction tank A (8) through the series static mixer (23), and the bottom of the reaction tank A (8) has an "S" shaped pipe (9) connected to the reaction tank B The upper cylindrical shoulder of (10), the bottom of the reaction tank B (10) is connected with the bottom of the settling box (19) by a pipeline, and the conical bottom of the settling box (19) is provided with a settling magnetic adsorption area (12) outside. The bottom of the box (19) is connected to the inlet of the screw pump (11), and the outlet of the screw pump (11) has a pipeline connected to the outer wall of the waist of the sludge tank (14), and the upper edge of the barrel wall of the sludge tank (14) has supernatant overflowing Pool (17), sludge magnetic adsorption area (15) is placed outside the conical bottom of the sludge tank (14), and there is a clear water overflow pool (20) on the outside of the wall of the reaction tank B (10), where the clear water overflows Pool (20) has pipeline to communicate with water tank (13) top. 2. mobile well flushing water well head circulating treatment device according to claim 1, is characterized in that: described reaction tank A (8) and reaction tank B (10) are the barrel-shaped thin-walled structure of upper opening, An agitator (21) is arranged at the barrel-shaped center, and both the settling tank (19) and the sludge tank (14) are barrel-shaped thin-walled structures with conical bottoms. 3. The mobile well flushing water well head circulating treatment device according to claim 2, characterized in that: the supernatant overflow pool (17) and the clear water overflow pool (20) are both on the upper edge of the barrel wall The outer side is a ring-shaped water channel surrounded by "L"-shaped thin plates, wherein a return pipe (18) is connected to the upper part of the reaction tank A (8) at the bottom of the supernatant overflow pool (17). 4. The mobile well-flushing water wellhead circulation treatment device according to claim 3, characterized in that: the skid-mounted base (1) is also equipped with a coagulant medicine box (5) and a flocculant medicine box ( 2), the coagulant medicine box (5) has a pipeline connected to the inlet of the metering pump B (4), and the outlet of the metering pump B (4) has a pipeline connected to the pipe center of the static mixer (23), and the flocculant medicine box ( 2) There is a pipeline connected to the inlet of the metering pump A (3), and the outlet of the metering pump A (3) is connected to the center of the "S"-shaped pipe (9). A screw conveyor (22) is provided, and the outlet of the screw conveyor (22) is located within the circumference range above the opening of the reaction tank A (8). 5. The mobile well flushing water wellhead circulating treatment device according to claim 4, characterized in that: the screw pump (11), the metering pump A (3), the metering pump B (4), the screw conveyor ( 22) and agitator (21) are all driven by DC motor. 6. The mobile well flushing wellhead circulating treatment device according to claim 1, characterized in that: the magnetic sedimentation zone (12) and the sludge magnetic adsorption zone (15) are filled with flaky NdFeB permanent magnets. 7. The mobile well-flushing wellhead circulating treatment device according to claim 5, characterized in that: the material conveyed by the screw conveyor (22) is iron powder for powder metallurgy, and the iron powder for powder metallurgy is The iron content is 65%, and the particle size of the iron powder for powder metallurgy is between 200 and 250 mesh.