CN115749667A - Oil well water plugging combined tool and plugging method based on MICP - Google Patents

Abstract

The invention belongs to the technical field of oil well plugging, and particularly relates to an oil well water plugging combined tool and a plugging method based on MICP. The oil well water plugging combined tool comprises a telescopic longitudinal rod, wherein a fixed support is arranged at the top of the longitudinal rod, and a water plugging tool is arranged at the bottom of the longitudinal rod; the water plugging tool comprises a longitudinal central shaft connected with the longitudinal rod, and a plurality of MICP realizing units are arranged around the longitudinal central shaft; the MICP realizing unit comprises a frame, a load cavity, a telescopic piece and a movable block, wherein the movable block is arranged in the frame, and a microbial thallus for implementing the MICP technology is loaded in the load cavity. The multiple MICP realizing devices and the plugging method utilize the advantages of the MICP technology, can simultaneously plug multiple points of a water outlet layer, have high efficiency and long plugging time, and have good fixing effect on the water plugging tool which is in contact with the wall of the oil well at multiple points.

Description

Oil well water plugging combination tool and plugging method based on MICP

Technical Field

The invention belongs to the technical field of oil well plugging, and particularly relates to an oil well water plugging combined tool and a plugging method based on MICP.

Background

The water output of the oil well is an important phenomenon in the oil extraction process of the oil field, if the water content in the produced liquid of the oil well is increased and the oil content is reduced, the produced liquid of the oil well is a precursor of the water output of the oil well, and the water output of the oil well can cause the sand body structure of a reservoir to be corroded to influence the oil production efficiency. The main types of oilfield formation water sources include: the water outlet mechanism of the oil well caused by different stratum water sources also has difference, such as upper layer water, lower layer water, interlayer water, edge water, bottom water, injected water and the like. The interlayer water is a water layer sandwiched between an upper oil layer and a lower oil layer, and due to the reasons of misinjection, low cementing quality and the like, the interlayer water enters the oil well and finally influences the oil production efficiency, so that water shutoff treatment is needed (Chenqingqu, method for identifying oil well water outlet reasons and judging water outlet layer position [ J ] chemical engineering management, 2019 (13): 2.).

In order to solve the above problems, many devices related to oil well water plugging have been developed in the prior art, for example, chinese patent CN110219614B discloses an electric water plugging tool for an oil well, which includes a first central tube, a connecting ring, a connecting tube, a second central tube, a first packer body, a spacing ring, a connecting block, a spacing block, a threaded rod, a connecting rod, a one-way valve, a second packer body, a control box and a pressure sensor; the electric water plugging tool for the oil well has the effects of reducing damage and monitoring in real time. For another example, chinese patent CN112983335A discloses a water shutoff matching combination tool, specifically a water shutoff matching combination tool, which includes a plugging ring, a placing column and a plugging ball, a connecting pipe is fixedly mounted below the plugging ring, an upper fixing sleeve is fixedly connected below the connecting pipe, a lower fixing sleeve is fixedly mounted below the upper fixing sleeve, an inner fixing sleeve is movably sleeved inside the lower fixing sleeve and the upper fixing sleeve, a plug sleeve is disposed outside the lower fixing sleeve, and triangular veins are disposed outside the inner fixing sleeve. This supporting combination tool of water shutoff makes the outside of interior fixed cover and the inboard fixed triangle line of having seted up of lower fixed cover, and the device makes things convenient for the outside of fixed stopper and the inner wall laminating of oil well, makes things convenient for the device to fix the inner wall at oil pipe.

The principle of the MICP technology is to utilize the functions of certain microorganisms in the nature, the microorganisms can metabolize to produce urease for decomposing urea, and carbonate ions produced after urea decomposition are combined with free metal cations in the nature to generate a gelled crystal. Such as Bacillus pasteurianus with high urease yield, the bacteria still have higher calcium carbonate generating capacity under the conditions of low oxygen, high temperature, high pressure, high pollution and the like. The generation of the calcium carbonate can repair cracks of rocks, bricks and the like, and can be applied to the fields of building foundation reinforcement, slope protection, oil fields, dam foundation permeability control and the like. The MICP technology can improve the geological characteristics of soil, so the MICP technology can be used as a substitute for geological reinforcement technology.

At present, the MICP is mainly used in the fields of slope reinforcement, wind prevention and sand fixation, concrete crack repair and the like, but a device based on the MICP is not available. In view of the special environment of the oil well, the invention develops the oil well water plugging combination tool based on the MICP technology.

Disclosure of Invention

In order to solve the technical problems, the invention provides an oil well water plugging combination tool and a plugging method based on MICP.

The invention provides an oil well water plugging combination tool, which comprises a telescopic longitudinal rod, wherein a fixed support is arranged at the top of the longitudinal rod, and a water plugging tool is arranged at the bottom of the longitudinal rod;

the water plugging tool comprises a longitudinal central shaft connected with the longitudinal rod, and a plurality of MICP realizing units are arranged around the longitudinal central shaft;

MICP realizes that unit includes frame, load chamber, extensible member, movable block, be equipped with the movable block in the frame, being close to of frame the lateral wall of vertical center pin is worn to be equipped with the extensible member, and the one end of extensible member with vertical center pin is perpendicular and connect, the other end with the movable block is connected, the movable block is equipped with a plurality ofly the load chamber, the opening in load chamber deviates from the one end setting of extensible member, the loading of load intracavity has the microbial thalli that is used for implementing the MICP technique.

Preferably, in the oil well water shutoff combination tool, the bottom end of the longitudinal rod is detachably connected with the top end of the longitudinal central shaft.

Preferably, in the oil well water shutoff combination tool, the fixed support is provided with a controller, and the controller is electrically connected with all of the telescopic pieces and the power supply.

Preferably, in the oil well water shutoff combination tool, the load chamber is a blind hole, and an open end of the load chamber faces the outside of the frame and faces away from the movable block.

Preferably, in the oil well water shutoff combination tool, the open end of the load chamber is provided with a filter device for preventing microbial cells for implementing the MICP technology from passing through, and the filter device is a filter membrane with a filter hole diameter smaller than the particle diameter of bacterial powder particles, or a filter screen with a filter hole diameter smaller than the width of the solid bacterial rod.

Preferably, the oil well water shutoff combination tool further comprises an adjusting tool capable of improving a microorganism growth environment, the adjusting tool comprises an air inlet pipe, an air outlet pipe and a pump, the air inlet pipe penetrates through the frame and is communicated with the load cavities, each load cavity is communicated with an air outlet channel, and the air outlet pipe penetrates through the frame and is communicated with the air outlet channels.

Preferably, in the oil well water plugging combination tool, one frame is connected with one air inlet pipe and one exhaust pipe, the air inlet pipe and the exhaust pipe form a group of pipeline combinations and are matched with the frame for use, all the pipeline combinations are laid along the longitudinal rod, the air inlet pipe or the exhaust pipe of one pipeline combination is provided with a pump, and gas in the air inlet pipe can be blown into the load cavity;

or, each frame is connected with a branch inlet pipe, all the branch inlet pipes are connected to a branch inlet pipe in a gathering mode, the inlet pipes are laid along the longitudinal rod, gas in the inlet pipes can be blown into load cavities, each load cavity is communicated with a branch exhaust pipe, all the branch exhaust pipes are connected to a branch exhaust pipe in a gathering mode, and the branch exhaust pipes are laid along the longitudinal rod.

Preferably, the oil well water plugging combination tool further comprises a heater and a refrigerator, the heater and the refrigerator are both connected with the air inlet pipe, a temperature sensor is arranged at any one of the frames, and the controller is electrically connected with the heater, the refrigerator and the temperature sensor.

Preferably, above-mentioned water blocking combination tool of oil well, every adjacent two MICP realizes all being equipped with a surface laminating instrument between the unit, the both ends of surface laminating instrument respectively with the movable block be equipped with the surface connection of load chamber open end, the surface laminating instrument includes elastic surface, elastic surface be used for with the position of the laminating of the oil well wall of a well be provided with a plurality of flow channels of intercommunication each other.

The invention provides a MICP-based plugging method, which comprises the following steps:

assembling the oil well water plugging combination tool according to the structure, enabling the longitudinal rod and the telescopic pieces to be in the shortest contraction state, and filling microbial cells for implementing MICP into the load cavity;

determining the height of the stratum to be blocked, and lowering the bottom end of the longitudinal rod to the height of the stratum;

extending the telescopic piece to enable the movable block to be in contact with the well wall;

after a period of time, the microbial thallus metabolism will plug the water outlet of the oil well, and then all the water plugging combination tools of the oil well are pumped back.

Compared with the prior art, the invention has the following beneficial effects:

1. the longitudinal rod is used for extending into an oil well, the top of the longitudinal rod is provided with a fixing support, the fixing support is used for being fixed at the position of the well mouth to play a role in fixing, the bottom of the longitudinal rod is provided with a water plugging tool, and the water plugging tool is used for being placed in a water outlet area in the oil well and plugging the water outlet area in the oil well to reduce water outlet and improve oil outlet efficiency.

The invention is provided with a plurality of MICP realizing devices, so that the multi-point plugging of the water outlet layer can be realized at the same time, the efficiency is high, the plugging time is long, and the fixing effect of the water plugging tool which is in multi-point contact with the wall of the oil well is good. The MICP implementation unit has the functions of: firstly, providing a barrier for mechanical plugging, fixing a water plugging tool at a stratum to be plugged, secondly, loading microbial thalli of urease capable of decomposing urea, providing living conditions of the microbial thalli, realizing plugging by using the MICP technology, and fully utilizing the advantages of the MICP technology; and thirdly, the microbial agent is contacted with the well wall at the position of the oil well where water is to be blocked, so that metabolites of the microbial agent can permeate into gaps of the well wall, the gaps can be blocked, the well wall at the position can be reinforced, the influence of oil well water outlet on the oil yield can be reduced, and the oil yield is finally improved.

2. Since there are many types of microorganisms suitable for the MICP technique, not all of them are suitable for the growing environment in the oil well, one embodiment of the present invention adds a new regulatory tool that can improve the growing environment of microorganisms. The adjusting tool not only has the function of replacing gas, but also can introduce microbial liquid into the air inlet pipe, and the exhaust pipe is utilized to pump away the thallus waste liquid, so that fresh microbial liquid can be continuously input into the plugging device, the metabolic speed of the fresh microbial liquid is high, and the plugging efficiency can be improved.

3. When the underground temperature is too high or too low, the growth of the added microorganisms can be influenced, so the invention is also provided with a heater and a refrigerator; the invention also increases the joint area with the wall of the oil well by arranging the elastic surface, thereby increasing the stability of the water plugging tool, and the place of the elastic surface for jointing with the wall of the oil well is provided with a plurality of flow channels which are communicated with each other, so that the microorganism and the metabolite thereof can flow along the flow channels, thereby increasing the contact area of the microorganism and the wall of the well and improving the water plugging efficiency.

Drawings

FIG. 1 is a schematic perspective view of a water shutoff combination tool for an oil well according to embodiment 1 of the present invention;

fig. 2 is a schematic perspective view of a water shutoff tool according to embodiment 1 of the present invention;

figure 3 is a diagram showing the connection of the longitudinal central axis with a MICP implementing unit according to embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of the operation of embodiment 1 of the present invention;

figure 5 is a drawing of the connection of the longitudinal central axis with a MICP implementing unit according to embodiment 2 of the present invention;

fig. 6 is a schematic perspective view of a water shutoff tool according to embodiment 4 of the present invention;

figure 7 is a drawing of the attachment of the surface attachment tool and its internal longitudinal central axis to a MICP implementing unit according to embodiment 4 of the present invention.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention to be implemented, the present invention will be further described with reference to the following specific embodiments and accompanying drawings. In the description of the present invention, reagents used are commercially available and methods used are conventional in the art, unless otherwise specified.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Example 1

A water plugging combination tool for an oil well is shown in figure 1 and comprises a longitudinal rod 1, wherein the longitudinal rod 1 is used for extending into the oil well, a fixing support 2 is arranged at the top of the longitudinal rod 1, the fixing support 2 is used for being fixed at the position of the well mouth to play a role in fixing, a water plugging tool 3 is arranged at the bottom of the longitudinal rod 1, and the water plugging tool 3 is used for being placed into a water outlet area in the oil well and used for plugging the water outlet area in the oil well so as to reduce water outlet and improve oil outlet efficiency. The method of the prior art can be adopted for judging the water outlet area in the oil well, such as the method recorded in the literature "Chenqingqu. Oil well water outlet reason identification and water outlet layer position judgment method [ J ]. Chemical engineering management, 201913 ]. Since the depth of the stratum to be water-blocked inside the oil well is uncertain, in this embodiment, the longitudinal rod 1 is set as an electric telescopic rod that is telescopic, so that the water blocking tool 3 can be lowered to the depth of the destination layer. By determining how deep the water is, by means of the prior art, the longitudinal bar 1 is controlled to extend to a length of up to.

Referring to fig. 2-3, the water shut-off means 3 includes a longitudinal central shaft 31 for connection with the longitudinal rod 1, and a plurality of MICP realization units are provided around the longitudinal central shaft 31, preferably, the MICP realization units are distributed in a circular array at the periphery of the longitudinal central shaft 31, and the MICP realization units function as: firstly, providing a barrier for mechanical plugging, fixing the water plugging tool 3 at a stratum to be plugged, secondly, loading microbial thalli of urease capable of decomposing urea, providing living conditions of the microbial thalli, and realizing plugging by using the MICP technology; and thirdly, the microbial agent is contacted with the well wall at the position of the oil well where water is to be blocked, so that metabolites of the microbial agent can permeate into gaps of the well wall, the gaps can be blocked, the well wall at the position can be reinforced, the influence of oil well water outlet on the oil yield can be reduced, and the oil yield is finally improved.

The MICP realizing unit comprises a frame 32, a load cavity 321, an expansion piece 322 and a movable block 323, wherein the expansion piece 322 is perpendicular to the longitudinal central shaft 31, the expansion piece 322 is an electric expansion rod, a controller is arranged on the fixed support 2 and is electrically connected with all the expansion pieces 322, the controller is used for controlling the extension length of the expansion piece 322, and a power supply used for supplying power to the controller is also arranged on the fixed support 2. The frame 32 is a hollow frame, the surface of the frame, which is away from the longitudinal central axis 31, is open, the other surfaces are closed structures, a movable block 323 is arranged in the frame 32, the movable block 323 can move in the frame 32, and the moving direction of the movable block 323 is the diameter direction of the oil well, that is, the movable block 323 can move to contact with the wall of the oil well. The side wall of the frame 32 close to the longitudinal central shaft 31 is provided with an opening, an expansion piece 322 penetrates through the opening, one end of the expansion piece 322 is fixedly connected with the longitudinal central shaft 31, the other end of the expansion piece 322 is fixedly connected with the side wall of the movable block 323, and the size of the opening is larger than that of the expansion piece 322; if the opening is a circular hole and the telescoping member 322 is cylindrical, the diameter of the opening is greater than the diameter of the telescoping member 322, allowing the telescoping member 322 to move relative to the opening. When the controller telescopic piece 322 is extended, the movable block 323 is pushed to move towards the adjacent well wall of the oil well and finally moves to contact with the well wall of the oil well, and a layer of physical plugging is realized.

In this embodiment, the movable block 323 is a solid block, a plurality of load chambers 321 are formed in the movable block 323, microbial cells capable of generating urease for decomposing urea are loaded in the load chambers 321, preferably, the load chambers 321 are blind holes, the open ends of the load chambers 321 face the outside of the frame 32, the open ends of the load chambers 321 are arranged away from the telescopic members 322, the open ends of the load chambers 321 are used for being attached to or being close to the position to be blocked in the oil well, after the load chambers 321 are filled with the microbial cells, in order to prevent the microbial cells from leaking out in the process of descending the MICP implementation unit, the load chambers 321 are arranged to be inclined upwards, and the angle between the inner bottom surface of the load chambers 321 and the horizontal plane is set to be 60-80 degrees.

After the water plugging tool 3 is placed into an oil well along with the longitudinal rod 1, the controller telescopic piece 322 on the fixed support 2 extends to push the movable block 323 to be in contact with the wall of the oil well to generate abutting pressure and friction force, microbial cells of the load cavity 321 can be continuously proliferated and moved, the microbial cells are also gradually in contact with the wall of the oil well and are metabolized to generate urease capable of decomposing urea, carbonate ions generated after urea decomposition are combined with metal cations of the wall of the oil well to generate substances for filling gaps of the wall of the well, the MICP water plugging effect is realized, substances generated by microbial metabolism enter the gaps of the wall of the well for a small amount of times and fill the gaps, the MICP water plugging tool has depth and width, the reinforcing and plugging effects are good, and the retention time is long. And the loading cavity 321 can be filled with nutrient substrates and metal cations required by microorganism metabolism to meet the requirements of microorganism growth and metabolism. The invention is provided with a plurality of MICP realizing devices, so that the multi-point plugging of the water outlet layer can be realized at the same time, the efficiency is high, and the fixing effect of the water plugging tool 3 which is in multi-point contact with the wall of the oil well is good.

In order to provide a better environment for the growth of microorganisms, the open end of the loading chamber 321 is provided with a filtration means which prevents the passage of microbial cells which carry out the MICP technique. Mixing microorganisms and a solid culture matrix to prepare fungus powder, loading the fungus powder into the loading cavity 321, sealing the opening end of the loading cavity 321 by using a filter membrane with the diameter of a filter hole smaller than the particle diameter of the fungus powder, wherein when the opening end of the loading cavity 321 is contacted with the wall of an oil well, the diameter of the filter hole of the filter membrane is larger than the particle diameter of the microorganisms, the microorganisms and metabolites thereof can seep out of the filter membrane and enter gaps of the wall of the well, and the solid culture matrix does not enter the oil well, so that solid waste residues are prevented from being formed. The microorganisms can also be inoculated on the surface of a solid bacteria stick which is a nutrient medium capable of meeting the growth of the microorganisms, the solid bacteria stick inoculated with the microorganisms is inserted into each loading cavity 321, and the opening end of each loading cavity 321 is closed by a filter screen with the diameter of a hole smaller than the width of the solid bacteria stick.

Preferably, the bottom end of the longitudinal rod 1 and the top end of the longitudinal central shaft 31 can be detachably connected, the connection and the disconnection of the bottom end and the longitudinal central shaft are controlled by connecting pieces such as an electromagnetic switch, friction force exists between the movable block 323 and the wall of the oil well in a propping manner, the longitudinal rod 1 can be contracted to the well mouth of the oil well, and only the water plugging tool 3 is reserved in the well, so that the oil pumping work of other strata, particularly the oil pumping work of the stratum above the plugging area can be normally carried out, the water plugging and the oil pumping are carried out simultaneously, the oil content of oil can be met, and the water plugging operation can be synchronously realized. And after the water outlet position is sealed by the microbial metabolite based on the MICP technology, the bottom end of the longitudinal rod 1 is put into the well and is in butt joint with the top end of the longitudinal central shaft 31, the controller of the fixed support 2 is used for controlling the telescopic piece 322 to shrink, the movable block 323 is separated from the wall of the oil well, and the water plugging tool 3 is withdrawn from the oil well.

The embodiment also provides a plugging method based on MICP, and the schematic diagram refers to FIG. 4, as follows:

the oil well water shutoff combination tool is assembled according to the structure of the embodiment, the longitudinal rod 1 and each expansion piece 322 are in the shortest contraction state, and the load cavity 321 is filled with microorganisms capable of implementing MICP;

determining the height of the stratum to be blocked, and enabling the lower part of the bottom end of the longitudinal rod 1 to reach the height of the stratum;

extending the telescopic element 322 to make the movable block 323 contact with the well wall;

after a period of time, the microbial metabolism will plug the well outlet and then pump all of the well plugging combination tools back.

Example 2

Because there are many kinds of microorganisms suitable for the MICP technology, and not all microorganisms are suitable for the growth environment in the oil well, the oil well water shutoff combination tool of the embodiment is an adjusting tool capable of improving the growth environment of the microorganisms is additionally arranged on the basis of the embodiment 1, referring to fig. 5, the adjusting tool comprises an air inlet pipe 4, an air outlet pipe 41 and a pump, one end of the air inlet pipe 4 is positioned at the well mouth of the oil well, and the other end of the air inlet pipe penetrates through the frame 32, in the embodiment, the load cavity 321 is not a blind hole, one end of the load cavity 321 close to the longitudinal central shaft 31 is communicated with the air inlet pipe 4, specifically, the air inlet pipe 4 is provided with a plurality of air inlet holes, each load cavity 321 is correspondingly communicated with one air inlet hole, and the two are connected with a gap seal to prevent liquid leakage; one end of the exhaust pipe 41 is located at the well head of the oil well, the other end of the exhaust pipe penetrates through the frame 32, one end of an exhaust channel 3211 is communicated with each load cavity 321, the other end of the exhaust channel 3211 is communicated with exhaust holes formed in the pipe body of the exhaust pipe 41 in a one-to-one correspondence manner, the pump is installed on the air pipe 4 or the exhaust pipe 41, and the pump is arranged close to the well head of the oil well. The inlet 4, outlet 41 and pump form a gas flow circuit for improving a small range of gas environment in the vicinity of each frame 32 to accommodate the growth of microorganisms. Preferably, the connection point of the air inlet pipe 4 and the frame 32 is located below the middle of the frame 32, the connection point of the air outlet pipe 41 and the frame 32 is located above the middle of the frame 32, and the openings of the air inlet pipe 4 and the air outlet pipe 41 are separately arranged, so that the air circulation at the frame 32 is facilitated. Note that due to the particular environment in which the well contains oil, the gas fed to the frame 32 must be a gas that meets safety requirements, and can be fed a small number of times to avoid sudden changes in the gas pressure in the well.

In the embodiment, one frame 32 is connected with one air inlet pipe 4, one frame 32 is connected with one air outlet pipe 41, one air inlet pipe 4 and one air outlet pipe 41 form a group of pipeline combinations which are matched with one frame 32 for use, all the pipeline combinations are laid along the longitudinal rod 1, and the air inlet pipe 4 or the air outlet pipe 41 of one pipeline combination is provided with a pump; this kind of mode is convenient for control frame 32's air current condition respectively, and the flexibility is high.

Alternatively, each frame 32 is connected to a branch inlet pipe, all of which are collectively connected to a total inlet pipe 4, the total inlet pipe 4 being laid along the longitudinal rod 1; each load chamber 321 is connected and communicated with one exhaust branch pipe, all the exhaust branch pipes are connected to one total exhaust pipe 41 in a gathering manner, and the total exhaust pipe 41 is laid along the longitudinal rod 1; the intake pipe 4 and the exhaust pipe 41 are laid along the longitudinal rod 1; this kind of mode practices thrift the pipeline consumptive material. In this configuration, a communication duct 42 is further provided, the communication duct 42 is connected between the longitudinal central shaft 31 and the frame 32, the branched intake pipe and the extensible member 322 are both provided inside the communication duct 42, the communication duct 42 protects the branched intake pipe and the extensible member 322, most of the intake pipe 4 and the exhaust pipe 41 are provided inside the longitudinal central shaft 31, and the longitudinal central shaft 31 is a hollow shaft.

The structure of this embodiment not only has the function of changing gas, still can let in the microorganism fungus liquid to intake pipe 4, utilizes blast pipe 41 to pump away the thalli waste liquid, so can be continuous to the shutoff play input fresh microorganism fungus liquid, and the metabolic rate of fresh microorganism fungus liquid is fast, can improve shutoff efficiency.

The embodiment also provides a MICP-based plugging method, which comprises the following steps:

the oil well water shutoff combination tool is assembled according to the structure of the embodiment, the longitudinal rod 1 and each expansion piece 322 are in the shortest contraction state, and the load cavity 321 is filled with microorganisms capable of implementing MICP;

determining the height of the stratum to be blocked, and enabling the lower part of the bottom end of the longitudinal rod 1 to reach the height of the stratum;

extending the telescopic piece 322 to make the movable block 323 contact with the well wall;

starting a pump, introducing microbial liquid or gas suitable for microbial growth into the air inlet pipe 4, wherein the microbial liquid and the gas can be introduced continuously or intermittently, and the microbial liquid and the gas can be introduced alternately or alternatively;

after a period of time, the microbial metabolism will plug the well outlet and then pump all of the well plugging combination tools back.

Example 3

When the downhole temperature is too high or too low, the growth of the added microorganisms can be influenced, so that the heater and the refrigerator are further arranged on the basis of embodiment 2, the heater and the refrigerator are arranged at the wellhead, and the heater and the refrigerator are both connected with the gas inlet pipe 4 and used for changing the temperature of gas in the gas inlet pipe 4 and further changing the temperature of gas entering the vicinity of the load cavity 321.

In this embodiment, "one branched intake pipe is connected to each frame 32, all the branched intake pipes are collectively connected to one collective intake pipe 4, and the collective intake pipe 4 is laid along the longitudinal rod 1; each frame 32 is connected to a branch exhaust pipe, all of which are collectively connected to a total exhaust pipe 41, the total exhaust pipe 41 being laid along the longitudinal bars 1; the inlet pipe 4 and the outlet pipe 41 are connected along a pipeline laid along the longitudinal rod 1 ".

In this embodiment, a temperature sensor may be further disposed at any frame 32, the temperature sensor is electrically connected to the controller, the controller is electrically connected to the heater and the refrigerator, the temperature sensor senses a current temperature of the frame 32, and transmits a signal to the controller, an optimal temperature value is preset in the controller, the controller compares the optimal temperature value with a temperature value sensed by the temperature sensor, if the temperature value sensed by the temperature sensor is lower than the optimal temperature value, the controller controls the heater to operate, the air intake pipe 4 is heated, the gas in the air intake pipe 4 is also heated, if the temperature value sensed by the temperature sensor is equal to the optimal temperature value, the controller controls the heater and the refrigerator to both stop operating, if the temperature value sensed by the temperature sensor is higher than the optimal temperature value, the controller controls the refrigerator to operate, and the air intake pipe 4 is cooled, and the gas in the air intake pipe 4 is also cooled.

Also can predetermine the optimum temperature range in the controller, the controller compares optimum temperature range value and the temperature value that temperature sensor responds to, if the temperature value that temperature sensor responds to is less than the lower limit value of optimum temperature range, then the work of controller control heater, heating intake pipe 4, if the temperature value that temperature sensor responds to is in optimum temperature range, then the work of controller control heater, refrigerator all stops, if the temperature value that temperature sensor responds to is higher than the upper limit value of optimum temperature range, then the work of controller control refrigerator, refrigeration intake pipe 4.

Example 4

An oil well water plugging combination tool is additionally provided with a surface attaching tool on the basis of the oil well water plugging combination tool of any one of the embodiments 1 to 3, referring to fig. 6 to 7, one surface attaching tool is arranged between every two adjacent MICP realizing units, and both ends of the surface attaching tool are respectively connected with the surface of the movable block 323 provided with the opening end of the load cavity 321, namely, the surface attaching tool can move along with the movement of the movable block 323.

Surface laminating instrument includes elastic surface 5, elastic surface 5 adopts not with the preparation of the elastic material that has of material reaction in the oil well, its effect be the increase with the laminating area of the oil well wall of a well, increase water shutoff instrument 3's steadiness to elastic surface 5 be used for with the place of the laminating of the oil well wall of a well be provided with a plurality of flow channel 51 of intercommunication each other, microorganism and metabolite can follow this flow channel 51 and flow, the area of contact increase of microorganism and the wall of a well so improves water shutoff efficiency.

The embodiment also provides a MICP-based plugging method, which comprises the following steps:

the oil well water shutoff combination tool is assembled according to the structure of the embodiment, the longitudinal rod 1 and each expansion piece 322 are in the shortest contraction state, and the load cavity 321 is filled with microorganisms capable of implementing MICP;

determining the height of the stratum to be blocked, and enabling the lower part of the bottom end of the longitudinal rod 1 to reach the height of the stratum;

extending the telescopic element 322 to make the movable block 323 contact with the well wall, wherein the movable block 323 expands the area of the elastic surface 5 when moving, and the elastic surface 5 and the movable block 323 contact with the well wall together;

after a period of time, the microbial metabolism will plug the well outlet and then pump all of the well plugging combination tools back.

It should be noted that, the connection relationship of the components not specifically mentioned in the present invention is the default of the prior art, and the connection relationship of the structure is not described in detail since it does not relate to the invention point and is a common application of the prior art.

It should be noted that, when the present invention relates to a numerical range, it should be understood that two endpoints of each numerical range and any value between the two endpoints can be selected, and since the steps and methods adopted are the same as those in the embodiment, in order to prevent redundancy, the present invention describes a preferred embodiment. While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The oil well water plugging combination tool is characterized by comprising a telescopic longitudinal rod (1), wherein a fixed support (2) is arranged at the top of the longitudinal rod (1), and a water plugging tool (3) is arranged at the bottom of the longitudinal rod (1);

the water plugging tool (3) comprises a longitudinal central shaft (31) connected with the longitudinal rod (1), and a plurality of MICP realizing units are arranged around the longitudinal central shaft (31);

MICP realizes unit includes frame (32), load chamber (321), extensible member (322), movable block (323), be equipped with movable block (323) in frame (32), frame (32) be close to the lateral wall of longitudinal center axle (31) is worn to be equipped with extensible member (322), the one end of extensible member (322) with longitudinal center axle (31) are connected, the other end with movable block (323) are connected, movable block (323) are equipped with a plurality ofly load chamber (321), load the microbial thalli that is used for implementing the MICP technique in load chamber (321).

2. An oil well water shutoff combination tool according to claim 1, characterized in that the bottom end of the longitudinal rod (1) is detachably connected to the top end of the longitudinal central shaft (31).

3. An oil well water shutoff combination tool according to claim 1, characterized in that a controller is provided on the fixed bracket (2), said controller being electrically connected to all of the telescoping members (322) and to a power source.

4. An oil well water shutoff combination tool according to claim 1, characterized in that the load chamber (321) is a blind hole and the open end of the load chamber (321) faces away from the movable block (323).

5. A well shut-off kit as defined in claim 4, characterized in that the open end of the load chamber (321) is provided with a filtering means preventing the passage of microbial cells implementing the MICP technique.

6. An oil well water shutoff combination tool according to claim 1, characterized in that it further comprises a regulating tool for improving the growth environment of microorganisms, said regulating tool comprises an air inlet pipe (4), an air outlet pipe (41) and a pump, said air inlet pipe (4) extends through said frame (32) and is communicated with each of said load chambers (321), each of said load chambers (321) is communicated with an air outlet channel (3211), and said air outlet pipe (41) extends through said frame (32) and is communicated with each of said air outlet channels (3211).

7. An oil well water shutoff combination tool according to claim 6, characterized in that one said frame (32) connects one said intake pipe (4) and one said exhaust pipe (41), one said intake pipe (4) and one said exhaust pipe (41) are a set of pipe combinations, all of which are laid along the longitudinal rod (1), and a pump is provided on the intake pipe (4) or the exhaust pipe (41) of one pipe combination;

or, each frame (32) is connected with a branch inlet pipe, all the branch inlet pipes are connected to one inlet pipe (4) in a gathering mode, the inlet pipes (4) are laid along the longitudinal rod (1), each load cavity (321) is communicated with a branch exhaust pipe, all the branch exhaust pipes are connected to one exhaust pipe (41) in a gathering mode, and the exhaust pipes (41) are laid along the longitudinal rod (1).

8. An oil well water shutoff combination tool according to claim 6, characterized by further comprising a heater and a refrigerator, both connected with the air intake pipe (4), a temperature sensor being provided at any one of the frames (32), the controller being electrically connected with the heater, the refrigerator and the temperature sensor.

9. An oil well water plugging combination tool according to claim 1, wherein a surface attaching tool is arranged between every two adjacent MICP realizing units, two ends of the surface attaching tool are respectively connected with the surface of the movable block (323) provided with the opening end of the load cavity (321), the surface attaching tool comprises an elastic surface (5), and the position of the elastic surface (5) for attaching with the wall of the oil well is provided with a plurality of flow channels (51) which are communicated with each other.

10. An oil well plugging method based on MICP is characterized by comprising the following steps:

a water shut-off assembly for oil wells assembled according to the structure of claim 1, wherein said longitudinal rod (1) and each of said expansion members (322) are in the shortest contracted state, and microbial cells for performing MICP are filled in said load chamber (321);

determining the height of the stratum to be blocked, and putting the bottom end of the longitudinal rod (1) down to the height of the stratum;

extending the telescopic piece (322) to enable the movable block (323) to be in contact with the well wall;

after a period of time, the microbial thallus metabolism will plug the water outlet of the oil well, and then all the water plugging combination tools of the oil well are pumped back.

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