The method of injection of the stimulant in the borehole and downhole injector plunger for its implementation

 

The invention relates to the oil industry and can be used to reduce the viscosity of the oil during lifting with the use of stimulants in the form of a low-viscosity solvent solution, for example low-viscosity oil, heated water or gas condensate. Improves the efficiency of the method and device reliability due to the intensive mixing of the stimulator reduce the viscosity of the oil. The inventive method involves feeding stimulant to an injecting holes, a pressure increase stimulator by movement of the plunger, dosed injection of stimulant below the freezing depth or periodic temperature changes well because of changes in temperature on the surface of the soil for this area and above the depth at which the temperature of the well is 90% of the temperature level of the pump. Stimulator Inuktitut but the height of the wells on one or n levels stationary column of oil and the largest doses of stimulant determine the largest part of the range of movement of the rod. The device includes a rod, which allows the connection with the rod casing, and a cylindrical housing with injection valves, which stage is includes a first annular valve cover which is rigidly connected with the upper part of the cylindrical rod. It allows sliding movement along the rod. In a circular hole in the middle of the casing by means of latch fixed partition. It includes a second annular valve cover that allows for sliding movement along the cylindrical rod and contacts in the open state of the second valve with the first latch rigidly connected with the bottom of the plunger. The rod is rigidly connected to the second latch, which allows contact with the bottom end of the rod is connected with the third latch, which is located below the second and contains the key. It allows the opening toward the wall. The rod is connected with the fourth latch that is located above the second latch at a distance, which is defined by the analytical expression. 2 C. p. F.-ly, 3 ill.

The invention relates to the oil industry and can be used in the production of heavy oil using stimulants to reduce its viscosity.

Known method of injection of the stimulant in the hole (patent UA № 14669 a, E 21 IN 43/12) containing a supply of stimulant, such as low-viscosity liquids, injects holes near the pump above the cnot density waves. Dose injection stimulator set by selection of the respective diameters of the outlet openings for the stimulator, as well as by the discharge from the pumping system. Injection of the stimulant in the space bounded by the casing and filled with a moving stream of oil, carry out synchronous radial flow stimulator. Prior to injection into the annulus stimulator mix below the level of the formation of radial his stream.

Coincide with the essential features of the method that is claimed, the filing of the stimulator to an injecting holes, a pressure increase stimulator by movement of the plunger, the dosed injection of stimulant in the space bounded by the casing string.

When using the known method of injection of the stimulant in the well stimulator is not enough crosses the flow of high-viscosity oil, resulting in insufficient decreases its viscosity.

Known method of injection of the stimulant in the hole (patent RU № 2088749, E 21 IN 43/00), chosen for the prototype involves feeding stimulant, such as low-viscosity liquids, injects holes, the increased pressure of the stimulator by moving the plunger up together with the rise defaut by selection of the respective diameters of the outlet openings for the stimulator. Injection of the stimulant in the space bounded by the casing and filled with a moving stream of oil, carried out simultaneously in two threads stimulator, one of which serves radially on the inner surface of the casing, and the other tangentially to the outer surface of a pump of compressori pipes. These threads stimulator, alternatively, may be spaced along the height of the well. Prior to injection into the annulus stimulator mix below the level of the formation of radial his stream.

Coincide with the essential features of the method that is claimed, the filing of the stimulator to an injecting holes, a pressure increase stimulator by movement of the plunger, the dosed injection of stimulant in the space bounded by the casing string.

When using the known method of injection of the stimulant in the well stimulator is not enough crosses the flow of high-viscosity oil, resulting in insufficient decreases its viscosity.

The task is improving the way the injection of the stimulant in the well, in which by changing process parameters provide a more intensive intersection stimulator post high-viscosity oil and the 21 In 43/12), containing cylindrical body with injection holes formed in the form of a series of radial holes. In the middle of the cylindrical body are rod, which allows the connection with the rod string and plunger in the form of a cylinder mixer, located under the injection holes, which is movable along the body and rigidly connected to the middle part of the bar.

Coincide with the essential features of the downhole plunger of the injector, which is claimed, a cylindrical housing with injection holes, inside of which is placed a rod, which allows the connection with the rod casing, a plunger that is movable along the body and connected in the middle part of the bar.

When using a known downhole plunger injector stimulator is not enough crosses the flow of high-viscosity oil, resulting in insufficient decreases its viscosity.

Known downhole plunger injector (patent RU NO. 2088749, E 21 IN 43/00), chosen for the prototype, which comprises a cylindrical housing with injection holes made in the form of at least one of a number of radial holes and at least one series aimed iant, the ribs mounted on the cylindrical housing of the centralizer. In the middle of the cylindrical body are rod, which allows the connection with the rod string and plunger in the form of a mixer, which is movable along the body and rigidly connected to the middle part of the post. Below the injection hole of the housing is rigidly connected with the wall, in the middle of which is a circular hole, in which between the bulkhead and the rod is the seal.

Coincide with the essential features of the downhole plunger of the injector, which is claimed, a cylindrical housing with injection holes, inside of which is placed a rod, which allows the connection with the rod casing, a plunger that is movable along the body and connected in the middle part of the post, below the injection hole of the housing is associated with a partition in the middle of which is a circular hole.

When using a known downhole plunger injector stimulator is not enough crosses the flow of high-viscosity oil, resulting in insufficient decreases its viscosity.

The task is improving the downhole plunger of the injector, in which by changing Cove largely reducing its viscosity.

In the method of injection of the stimulant in the borehole, which involves feeding stimulant to an injecting holes, a pressure increase stimulator by movement of the plunger, dosed injection of stimulant in the space bounded by the casing, according to the invention the injection carried out below the freezing depth or periodic temperature changes well because of changes in temperature on the surface of the soil for this area and above the depth at which the temperature of the well is 90% of the temperature level of the pump, the stimulant Inuktitut height well on one or n levels stationary column of oil and the largest doses of stimulant determine the largest part of the range of movement of the rod from the top down.

In downhole plunger of the injector, which includes a cylindrical housing with injection holes, inside of which is placed a rod, which allows the connection with the rod casing, a plunger that is movable along the body and connected in the middle part of the post, below the injection hole of the housing is associated with a partition in the middle of which is a circular hole, according to the invention in seredy part of a cylindrical rod, which is movable along the rod, the cover of the first valve contacts in the open condition of the valve plunger through the elements limit the valve opening, the septum is made of a circular hole of the second valve, the annular cover which permits sliding movement along the cylindrical rod and contacts in the open state of the second valve with the first latch rigidly connected with the bottom of the plunger, link partitions with the cylindrical body is made through the latch is fixed in the circular recess of the cylindrical body, the injection holes which contain exhaust valves, a rod rigidly connected with another lever that allows contact with the bottom end of the rod is connected with the third latch, which is located below the second and contains the key that allows the opening of the latch in the partition associated with the fourth latch that is located above the second latch at a distance that is equal to

F=L(1-k)+H,

where L is the range of movement of the rod, m;

k - part of the range of movement of the rod with the implementation of injection, Rel. units;

N - the length of the plunger, m

The above features of the process, which is claimed, provides injection lubrication annulus and passing areas with lower temperature.

The above characteristics of the injector, which is claimed, provides the possibility of establishing it in the column tubing and sucker rod string, the implementation of the dosed injection, and optionally a lifting rod string.

In Fig. 1 shows schematically the downhole injector plunger, which implements the method, which is declared; Fig. 2 is schematically the dependence of the temperature of the well from the depth of the well; Fig. 3 - element latch, end view.

Downhole injector plunger comprises a cylindrical housing 1 with injection holes 2, each of which contains a ball valve 3 with the locking spring 4 and the retaining elements 5. Inside the housing 1 posted by rod 6 which is connected with the rod column 7 pump not shown in the figure. The plunger 8 has a circular hole of the first valve 9 and is connected with the inner surface of the housing 1 through the gaskets 10, with the rod 6 through the sliding connection of the cover of the first valve 11 and is rigidly associated cylindrical rod 12, and also contains elements for limiting the magnitude of opening of valve 11, which is made in the form of pins 13 which are welded to the plunger 8, the washers 14 and ha is the opening 17 of the second valve, the annular cover 18 which is connected through a stuffing box 19 with the outer surface of the cylindrical rod 12, the bottom of which is attached the first clamp ring 20 of the cover 18. The partition 16 is fixed in the circular recess 21 of the cylindrical casing 1 through the bolt latch 22, which is rigidly connected with the opening 23 and is in contact with the spring 24. Cover of the first valve 11 allows contact with the sealing gasket 25 on the plunger 8, the cover of the second valve 18 with sealing gasket 26 on the partition 16.

The rod 6 is rigidly connected to the second latch 27, which allows contact with the bottom end of the rod 12 and is located at the bottom of the rod 6, is connected with the third latch 28, below, as a variant, the rod 7 of the pump is connected with the fourth latch 29, which is located in the upper part of the rod 6 and allows contact with the cover 11 of the first valve through the gasket 30. The third latch 28 contains the key 31, which allows contact with the opening 23 of the latch.

Schematic dependence of the temperature of the well from the depth of the well illustrates the uneven distribution of temperature along the borehole and dependence, in particular, from the change of seasons is shown by the dotted line. The next line illustrates wora location for injection of the stimulant, depth 33 - second limit of this range.

The proposed method and downhole injector plunger implemented in this way.

With the internal thermometer to measure the temperature distribution in the borehole in the area below the freezing depth or periodic temperature changes well due to temperature changes on the surface of the soil for this area and determine the depth of 33, taking into account the maximum possible cooling of the steel structural elements well. Measure the temperature distribution in the borehole in the region above the oil pump and define depth 32, in which the temperature of the well is 90% of the temperature level of the pump. Select the type of stimulator: for heavy oil - solvent or low-viscosity liquid, such as low-viscosity oil; for high-wax oil - heated water or gas condensate.

Carry respectively a specific task, the installation of the downhole injector plunger on one or n levels in the well, while the dose of the stimulant is determined from the magnitude plot of the range of movement of the rod from the top down, which increase or decrease the distance between the tabs 27, 29 and 20. Hearth the motion of the plunger and carry out the injection of a dose of stimulant in the stationary cylindrical column of oil during the movement of the rod from the top down.

Downhole plunger injector operates in equipment for oil sucker-rod pump is connected with his rod column 7 tubing and fill the cavity stimulator.

The upward movement of the bar causes the rise together with the rod 6 of the second latch 27, the rod 12 with the first cover 11 and the cover 18 of the second valve plunger 8 through the transmission of forces from the lid 11 on the stud 13, a washer 14 and a nut 15. Stimulator fills the cavity of the downhole plunger of the injector through the holes 9 and 17 under open lids 11 and 18 of the valve and fills the lower cavity through openings in the third latch 28.

During the movement of the rod 6 down the second latch 27 is out of contact with the rod 12, the first latch 20 holds the cover 18 of the second valve stem 12. The latch 29 comes into contact with the cover of the first valve 11 through the sealing gasket 30. Cover of the first valve 11 comes into contact with the plunger 8 through the sealing strip 25, together with the cover of the second valve 18 comes into contact with the wall 16 through the sealing strip 26, so that the pressure increase in the cavity between the first and second valve causes movement of shareware 12 to its upper position, and since then, the rod 6 carries out the next upward movement.

Stimulator intensively cuts a cylindrical column of oil, which is during the movement of the rod 6 down in a static state, and forms a ring of the stimulator, the size and stability of the form of which depends on the ratio between physical and chemical properties of oil and stimulant. Subsequent movement of the rod 6 up causes the filling of the cavities of the injector stimulator, return mirovogo valve 3 to the closed position, and oil your cutting edge movement displaces the stimulator in the direction of the walls of the casing and tubing. Thus, there is a decrease in viscosity in the near wall regions of the cavity, which moves oil, facilitated its rise may be reduced energy losses or increased intensity of crude oil production.

Example. The borehole was drilled to the reservoir located at a depth of 1460 m in the region where there is no permafrost. The temperature on the ground surface at the time of measurement was 18°C, according to the data of meteorological observations the lowest temperature was minus 34C. measurement temperature of the metal elements of her designs decreases relatively with temperature, which is determined through geothermal ratio is 13 m; the temperature of the well at the depth location of the pump equals 45With; the depth at which the temperature of the well is equal to 40.5With 90% of the previous value, is 1314 m Oil has a high viscosity, which is the depth of the location of pump 60 MPaC, which is however sufficient for efficient operation of the pump. The first injector is installed to overcome the complications associated with the rise of the column of oil at a depth of 1200 m, the second is for renewal of stimulant injected below, and to overcome the complications associated with a decrease in temperature according to Geothermy and seasonal decreases in temperature, at a depth of 200 m, the Injection of solvent in the high-viscosity oil at the two sites, in the depth of the borehole and near its mouth allows for effective stimulation of the rise of oil and to increase the intensity of oil production by 20-30%.

Claims

1. The method of injection of the stimulant in the borehole, which involves feeding stimulant to an injecting holes, a pressure increase sdney column, characterized in that the injection carried out below the freezing depth or periodic temperature changes well because of changes in temperature on the surface of the soil for this area and above the depth at which the temperature of the well is 90% of the temperature level of the pump, the stimulant Inuktitut height well on one or n levels stationary column of oil and the largest doses of stimulant determine the largest part of the range of movement of the rod from the top down.

2. Downhole plunger injector, which includes a cylindrical housing with injection holes, inside of which is placed a rod, which allows the connection with the rod casing, a plunger that is movable along the body and connected in the middle part of the post, below the injection hole of the housing is associated with a partition in the middle of which is a circular hole, characterized in that in the middle of the plunger is made of a circular hole of the first valve, an annular cover which is rigidly connected with the upper part of the cylindrical rod, which is movable along the rod, the cover of the first valve contacts in the open condition of the valve with the Pld is cerned valve, an annular cover which permits sliding movement along the cylindrical rod and contacts in the open state of the second valve with the first latch rigidly connected with the bottom of the plunger, link partitions with the cylindrical body is made through the latch is fixed in the circular recess of the cylindrical body, the injection holes which contain exhaust valves, a rod rigidly connected with the second latch, which allows contact with the bottom end of the rod is connected with the third latch, which is located below the second and contains the key that allows the opening of the latch in the partition associated with the fourth latch that is located above the second latch at a distance F, which is

F=L(1-k)+H,

where L is the range of movement of the rod, m;

k - part of the range of movement of the rod with the implementation of injection, Rel. units;

N - the length of the plunger, M.

 

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FIELD: oil extractive industry.

SUBSTANCE: method includes lowering a tail piece into well with temperature, electric conductivity and pressure sensors placed on tail piece along its length. Pressure sensors are used in amount no less than three and placed at fixed distances from each other. After that, continuously during whole duration of well operation between maintenance procedures, temperature, conductivity of well fluid, absolute value of face pressure and difference of pressures along depth of well in area of productive bed are recorded. Different combinations of pairs of pressure sensors are used for determining special and average values of well fluid density. When absolute pit-face pressure is lower then saturation pressure for well fluid by gas and/or when average values of density deviate from well fluid preset limits and/or when its conductivity deviates from preset limits, adjustment of well operation mode is performed.

EFFECT: higher efficiency, higher safety.

2 cl

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