CN217501618U - Narrow density window stratum well cementation control system - Google Patents
Narrow density window stratum well cementation control system Download PDFInfo
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- CN217501618U CN217501618U CN202123376003.XU CN202123376003U CN217501618U CN 217501618 U CN217501618 U CN 217501618U CN 202123376003 U CN202123376003 U CN 202123376003U CN 217501618 U CN217501618 U CN 217501618U
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Abstract
The utility model provides a narrow density window stratum well cementation control system, it contains: the automatic controller generates a pressure adjusting instruction when overflow or leakage occurs in the process of well cementation and cement injection; the choke manifold is connected with the automatic controller, executes a pressure adjusting instruction and ensures that the bottom pressure is in a narrow density window stratum pressure range in the well cementation and cement injection process; and the pressure compensating pump is connected with the throttle manifold through a three-way connecting piece, and applies back pressure according to a wellhead back pressure value in the waiting coagulation process, so that the well bottom pressure in the waiting coagulation process is ensured to be within a narrow density window stratum pressure range. The utility model discloses be applied to whole well cementation process with the closed-loop thought, have corresponding density, discharge capacity, back pressure design and accurate control of carrying on through narrow density window stratum, effectively guarantee well cementation cementing and wait to congeal in-process bottom pressure at narrow density window stratum pressure scope, realized narrow density window stratum safety quality guarantee well cementation, have easy operation, characteristics that the practicality is strong, be fit for the on-the-spot popularization and application.
Description
Technical Field
The utility model relates to an oil gas field well cementation engineering technical field, specifically speaking relates to a narrow density window stratum well cementation control system.
Background
With the rapid increase of national economy, the demand of China on oil is increasing day by day, the exploitation of oil is gradually shifted to deeper and more complex blocks, the geological conditions of oil and gas reservoirs are more and more complex, and the problem of narrow density windows in the drilling and completion process is still a world problem. Due to the narrow pressure window of the drilled stratum and the uncertainty of the stratum, various complex conditions such as blowout, leakage, collapse, blockage and the like are easy to occur in the drilling process, and once the complex conditions are not properly treated, safety accidents such as blowout and the like are easy to cause. The narrow density window encountered in well drilling also greatly affects the design and construction of well cementation, and because the open hole section is long and the pressure system is more in the well cementation process, the well cementation is a hidden project, the duration is short, the cost is high, the well cementation is required to be successful once, and once a problem occurs, the problem is generally difficult to remedy, so the design of the narrow density window stratum well cementation fluid in the well cementation process and the control of the construction process are extremely important.
Aiming at the stratum with a narrow density window, the conventional well cementation mode in the prior art has the problem that pressure stability and leakage prevention are difficult to be considered in the well cementation process. Currently, a common method for drilling narrow density window formations is to perform controlled pressure drilling. The pressure-controlled well drilling adopts a closed-loop system, and the bottom hole pressure is always in a safe density window by accurately controlling the annular pressure profile. Although the drilling process can be controlled, the prior art does not have a good solution to the problem of narrow density windows in the cementing process.
To prior art's problem, the utility model provides a narrow density window stratum well cementation control system.
SUMMERY OF THE UTILITY MODEL
For the well cementation operation difficult problem in the narrow density window stratum among the solution above-mentioned prior art, the utility model provides a narrow density window stratum well cementation control system, a serial communication port, the system contains:
the automatic controller is used for generating a pressure adjusting instruction when overflow or leakage occurs in the process of well cementation and cement injection;
the choke manifold is connected with the automatic controller and used for executing the pressure adjusting instruction so as to ensure that the bottom pressure is in the range of the formation pressure with a narrow density window in the process of well cementation and cement injection;
and the pressure compensating pump is connected with the throttling manifold through a three-way connecting piece and is used for applying back pressure according to a wellhead back pressure value in the waiting coagulation process so as to ensure that the bottom pressure is in a narrow density window stratum pressure range in the waiting coagulation process.
According to an embodiment of the present invention, the system comprises:
the vibrating screen is connected with the throttling manifold and is used for filtering solid phases in mud;
the circulating tank is connected with the vibrating screen and used for storing drilling fluid to meet the circulating requirement;
the drilling pump is connected with the circulating tank and used for providing necessary energy for the circulation of the drilling fluid and conveying the drilling fluid into the drilling tool at certain pressure and flow rate to complete the whole circulation process;
the cementing head is connected with the drilling pump and is used for special tools for injecting cement slurry and releasing a rubber plug, and the cementing head is arranged at the top end of the casing pipe when cementing;
the cementing pump is connected with the cementing head and is used for providing power for cementing construction operation;
the water tank is connected with the well cementation pump;
the blowout preventer is connected with the cementing head, belongs to a well control device and is used for preventing the well blowout from generating and ensuring the construction safety;
the casing head is connected with the blowout preventer through a four-way connecting piece and is used for supporting the gravity of a technical casing and an oil layer casing;
a casing connected to the casing head to provide a passageway for flow from the producing formation to the surface.
According to the utility model discloses an embodiment, when the well cementation scene is equipped with the turnip head, through the turnip head seals the annular space, three-terminal of three way connection spare is connected respectively the choke manifold the pressure compensating pump casing head.
According to the utility model discloses an embodiment, when the turnip head is not installed to the well cementation scene rotatory control head is installed to preventer top to seal off the annular space.
According to an embodiment of the present invention, the system comprises:
the first flat plate valve is connected between the pressure supplementing pump and the three-way connecting piece;
and the second flat plate valve is connected between the throttle manifold and the three-way connecting piece.
According to an embodiment of the present invention, the system comprises:
and the cement slurry density determining device is used for determining the cement slurry density in the well cementation and cementing process according to the actual drilling pressure window in the well drilling process.
According to an embodiment of the present invention, the system comprises:
and the coagulation waiting process control device is used for calculating the wellhead back pressure value in the coagulation waiting process, and generating a pressure supplementing instruction according to the wellhead back pressure value so as to control the pressure supplementing pump to apply back pressure.
The utility model provides a pair of narrow density window stratum well cementation control system compares with conventional well cementation, be applied to whole well cementation in-process with the closed-loop thought, have corresponding density of carrying on through narrow density window stratum, discharge capacity, back pressure isoparametric design and accurate control, can effectively guarantee well cementation water injection cement and wait to congeal in-process well bottom pressure in narrow density window stratum pressure range, realized narrow density window stratum safety quality guarantee well cementation, the operation is simple, the practicality is strong characteristics, be fit for the on-the-spot popularization and application.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the scope of the invention. In the drawings:
fig. 1 shows a block diagram of a narrow density window formation cementing control system, according to an embodiment of the present invention;
fig. 2 shows a block diagram of a cementing site with a radish head according to an embodiment of the present invention; and
fig. 3 shows a block diagram of a cementing site without a radish head according to an embodiment of the present invention.
The reference numbers in the drawings are as follows: 1. a water tank; 2. a well cementing pump; 3. a drilling pump; 4. a blowout preventer; 5. a four-way connecting piece; 6. a casing head; 7. a first flat plate valve; 8. a second flat plate valve; 9. a pressure supplementing pump; 10. a choke manifold; 11. an automatic controller; 12. vibrating screen; 13. a circulation tank; 14. a cementing head; 15. drill pipe (casing); 16. a subterranean formation; 17. an annulus; 18. rotating the control head; 19. tee junction spare.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a structural block diagram of a narrow density window formation cementing control system according to an embodiment of the present invention.
As shown in FIG. 1, a narrow density window stratum cementing control system 100 comprises an automatic controller 11, a choke manifold 10 and a pressure compensating pump 9.
Specifically, the automatic controller 11 is configured to generate a pressure adjustment command when an overflow or a loss occurs during the cementing process; the choke manifold 10 is connected with an automatic controller 11 and used for executing a pressure adjusting instruction so as to ensure that the bottom pressure is in a narrow density window stratum pressure range in the well cementation and cement injection process; and the pressure compensating pump 9 is connected with the choke manifold 10 through a three-way connecting piece 19 and is used for applying back pressure according to a wellhead back pressure value in the waiting coagulation process so as to ensure that the bottom pressure is in a narrow density window stratum pressure range in the waiting coagulation process.
In one embodiment, a narrow density window formation cementing control system 100 includes a cement slurry density determination device for determining a cement slurry density during a cementing process from a weight on bit window during drilling.
Specifically, the cement slurry density determining device needs to collect the formation pore pressure p through geological logging data and adjacent well data p Collapse pressure p b Formation fracture pressure p f Respectively calculating corresponding equivalent density, namely equivalent density of formation pore pressure is rho p And a collapse pressure equivalent density of rho b And the formation fracture pressure equivalent density is rho f 。
The cement slurry density determining device needs to calculate the friction pressure drop p in the well cementation process L ：
Wherein ρ Drill Is the density of the drilling fluid in g/cm 3 (ii) a f is the friction coefficient; v is the annular return velocity, m/s; h is well depth m; d is the outer diameter of the annulus, m; d is the inner diameter of the annulus m;
the cement slurry density determining device needs to determine the cement slurry density according to a real drilling pressure window in the drilling process, and specifically comprises the following steps:
if p is f -Max(p p ,p b )＞p L + Δ p, the cement slurry density is designed according to conventional cementing design.
If p is f -Max(p p ,p b )＜p L + Δ p, a certain safe pressure coefficient Δ p cannot be added according to the conventional design, Δ p is calculated from the safe added value of the drilling fluid density (0.05-0.1 g/cm3 for oil wells, 0.07-0.15 g/cm3 for gas wells), Δ p is 0.00981gh, and because multiple fluids exist in the annular space during the well cementation process: flushing fluid, spacer fluid, cement slurry, plugging fluid and the like, and annular static equivalent density rho in the well cementation process ESD Taking:
ρ ESD ＝Max(ρ p ,ρ b )
the cement slurry density calculation meets the following requirements:
ρ ESD gh＝ρ drill gh 1 +ρ Punching machine gh 2 +ρ Partition gh 3 +ρ Collar gh 4 +ρ Tail gh 5
Where ρ is Drill Is the density of the drilling fluid in g/cm 3 ；ρ Punching machine Is the density of flushing fluid in g/cm 3 ；ρ Partition For the spacer fluid density, g/cm 3 ；ρ Collar Is the density of the cement slurry collar slurry, g/cm 3 ；ρ Tail Is the density of the tail slurry of the cement slurry in g/cm 3 ；ρ ESD For annular static equivalent density in the well cementation process, g/cm 3 (ii) a h is the well depth, m; h is 1 The length m of the annular drilling fluid after well cementation is finished; h is 2 The length of the annular flushing fluid is m after the well cementation is finished; h is 3 The length of the annular space spacer fluid m after the well cementation is finished; h is 4 The annular cement slurry collar length m is the annular cement slurry collar length after the well cementation is finished; h is a total of 5 The length of the tail slurry of the annular cement slurry is m after the well cementation is finished.
Further, the specification requirements for the density and length of the flushing and spacer fluids involved need to be met:
(1) the density of the washing liquid is generally 1.0-1.03g/cm 3 ；
(2) The density of the spacer fluid is generally less than that of cement paste by 0.06-0.12g/cm 3 ；
(3) The lengths of the flushing liquid and the spacer fluid in the annulus are not more than 250m when the flushing liquid or the spacer fluid is used independently; when the materials are used together, the design dosage is carried out according to the length of 2:1, and the total length does not exceed 300 m; the well depth exceeds 3000m, and the total dosage of the spacer fluid and the flushing fluid is increased by 0.2-0.3m every 300m 3 ；
Further, for the cement slurry leading and tail slurry density and length requirements involved, the specification requirements need to be met:
(1) returning the collar slurry to the designed elevation;
(2) the tail slurry returns to the main sealing well section for more than 50-150 m.
(3) The density of leading pulp is recommended to be lower than that of tail pulp by 0.01-0.02g/cm 3 。
Circulating according to the cement paste density calculated by the cement paste density determination device by the system shown in the figure 1, the figure 2 or the figure 3, and if loss occurs in the cement injection process, adopting a multiple grouting method or performing wellhead reinjection so as to reduce the annular pressure and reduce the loss; if overflow occurs in the cementing process, the pressure of the throttle manifold 10 is adjusted by the automatic controller 11, the vertical pressure value is constant when the throttle manifold 10 is adjusted in the low pump speed test, and the back pressure value at the moment is the required back pressure value, so that the influence of the overflow on the cementing quality is reduced.
In one embodiment, a narrow density window stratum well cementation control system 100 comprises a leakage control device, which is used for generating a pressure regulation instruction through an automatic controller when leakage occurs in a well cementation and water injection process, so as to reduce the discharge capacity or increase the opening degree of a throttle valve, and gradually reduce the wellhead back pressure to 0, thereby reducing the annular pressure and reducing the leakage; if the leakage is larger than the critical value, performing wellhead back-squeezing cement operation after the cementing is finished.
The overflow control device calculates the bottom hole pressure p in the cementing process according to the density of various fluids in the selected annulus d ：
p d ＝ρ Drill gh 1i +ρ Punching machine gh 2i +ρ Partition gh 3i +ρ Collar gh 4i +ρ Tail gh 5i +∑p fi +p a
Wherein h is 1i The length of the annular drilling fluid in the cementing process is m; h is a total of 2i The length of the annular flushing fluid in the cementing process is m; h is 3i The length of the annular space spacer fluid m in the cementing process; h is 4i The length of the hollow cement slurry in the cementing process is m; h is a total of 5i The length of the tail slurry of the hollow cement slurry in the cementing process is m; p is a radical of formula d The bottom hole pressure in the cementing process is Mpa; p is a radical of fi The friction pressure drop of each slurry column in the cementing process is Mpa; v is the annular flow velocity, m/s; d is the outer diameter of the annulus m; d is the inner diameter of the annulus m; p is a radical of formula a The well mouth back pressure is MPa.
The casing pressure in the cementing process is 0 as much as possible, the operation without pressure is carried out, and the bottom hole pressure meets the stratum pressure range of a narrow density window, as follows:
Max(p p ,p b )＜p d ＜p f
and if the bottom hole pressure is not in the formation pressure range of the narrow density window, increasing or reducing the density of the cement slurry or adjusting the discharge capacity according to actual conditions until the bottom hole pressure meets the requirements.
The well bottom pressure in the pump stopping process consists of hydrostatic column pressure and well head back pressure:
p' d ＝ρ drill gh 1i +ρ Punching machine gh 2i +ρ Partition gh 3i +ρ Collar gh 4i +ρ Tail gh 5i +p a
Since the friction resistance disappears, a certain back pressure is added to keep the bottom hole pressure constant, and p is added a ＝∑p fi 。
In one embodiment, the narrow density window formation well cementation control system 100 comprises a waiting coagulation process control device, which is used for calculating a wellhead back pressure value in a waiting coagulation process and generating a pressure supplementing command according to the wellhead back pressure value so as to control a pressure supplementing pump to apply back pressure.
In the waiting coagulation process, due to hydration of cement paste, the annular pressure can be reduced, and well kick can occur, so that wellhead back pressure needs to be applied in the waiting coagulation process, and the wellhead back pressure value p a Calculated from the following formula:
wherein tau is static gel strength Pa; and z is the depth of the cement paste, m.
Specifically, the waiting solidification process control device applies a back pressure according to the calculated back pressure value by the pressure compensating pump 9 according to the back pressure value calculated by the formula.
The utility model discloses use the rationale of control pressure well drilling as the basis, be used for the well cementation in-process with the closed-loop thought, through relevant parameters such as density, discharge capacity of design well cementation fluid, cooperate automatic choke manifold regulating throttle opening, with bottom hole pressure control in stratum hole-fracture pressure window (narrow density window stratum pressure scope), reach the purpose of the well cementation of guaranteeing the quality safely. The method is simple to operate, high in practicability and suitable for stratum well cementation construction of narrow-density windows.
Fig. 2 shows a block diagram of a cementing site with radish heads according to an embodiment of the present invention.
As shown in figure 2, when a radish head is arranged on a well cementation site, an annular space is sealed through the radish head, and the three ends of the three-way connecting piece 19 are respectively connected with the choke manifold 10, the pressure compensating pump 9 and the casing head 6. The first flat plate valve 7 is connected between the pressure compensating pump 9 and the three-way connecting piece 19, and the second flat plate valve 8 is connected between the throttle manifold 10 and the three-way connecting piece 19.
The system connection flow shown in fig. 2 is as follows: connecting a cementing pump 2, a drilling pump 3 and a choke manifold 10; the choke manifold 10 is connected with the casing head 6 by means of a high-pressure hose, and the second flat plate valve 8 is opened. The pressure compensating pump 9 is connected into a throttle manifold 10; and (3) connecting the pressure compensating pump 9 into the throttle manifold 10 through a high-pressure rubber pipe, and closing the first flat plate valve 7. Determining the annular equivalent density ECD of the narrow density window, and calculating the density required by the well cementation cement slurry. After cementing, the first flat plate valve 7 is opened, the second flat plate valve 8 is closed, and the choke manifold 10 can be cleaned or dismantled. Wherein, ECD, that is, equivalent circulating density, refers to the density converted from the sum of hydrostatic column pressure and circulating friction resistance in the circulating process, namely: the bottom hole pressure during circulation is converted into density according to the well depth, and ECD is pd/(gh).
Before cementing, the connection between the well team killing manifold is firstly disconnected, and the connection mode shown in figure 2 is established. If the field is filled with the radish head, the radish head can seal the annular space to form a closed loop system, so the first circulation flow shown in fig. 2 is as follows: connecting a well cementation pump 2 and a water tank 1 to a cement head 14, and pumping well cementation fluid (flushing fluid, spacer fluid, cement slurry, plug pressing fluid and the like) into a drill rod (casing) 15 through the well cementation pump 2; the conventional drilling pump 3 is connected with a circulation tank 13 and then connected with a cementing head 14, displacement fluid is pumped into a drill pipe (casing) 15 by the drilling pump 3, and fluid in an annulus 17 enters the choke manifold 10 through a casing head 6 and then returns to the circulation tank 13 through a vibrating screen 12. In order to reduce the influence of loss of cement during the waiting period, a supply pump 9 is additionally arranged in front of the choke manifold 10 and used for supplying pressure to the annulus during the waiting period.
As shown in fig. 2, after being connected with the four-way connecting piece 5, the casing head 6 is connected with the automatic controller 11, and the opening of the throttle manifold 10 is adjusted to adjust the back pressure, so that the bottom hole pressure is controlled within the range of the formation pressure of the narrow density window; the middle of the choke manifold 10 and the casing head 6 is connected with a three-way connecting piece 19, and the supplementary pump 9 is connected with the three-way connecting piece 19 and used for supplementing pressure loss caused by loss of cement slurry weight in the well cementation and setting waiting process.
Fig. 3 shows a block diagram of a cementing site without a radish head according to an embodiment of the present invention.
As shown in FIG. 3, when a turnip head is not installed at the cementing site, a rotating control head 18 is installed above the blowout preventer 14, thereby sealing off the annulus. The first flat plate valve 7 is connected between the pressure supplementing pump 9 and the three-way connecting piece 19, and the second flat plate valve 8 is connected between the throttle manifold 10 and the three-way connecting piece 19.
The system connection flow shown in fig. 3 is as follows: connecting a cementing pump 2, a drilling pump 3 and a choke manifold 10; and (3) connecting the choke manifold 10 with the rotary control head 18 by using a high-pressure rubber pipe, and opening the second flat plate valve 8. The pressure compensating pump 9 is connected into a throttle manifold 10; and (3) connecting the pressure compensating pump 9 into the throttle manifold 10 through a high-pressure rubber pipe, and closing the first flat plate valve 7. Determining the annular equivalent density ECD of the narrow density window, and calculating the density required by the well cementation cement slurry. After the cementing, the first flat plate valve 7 is opened, the second flat plate valve 8 is closed, and the choke manifold 10 can be cleaned or removed. Wherein, ECD, that is, equivalent circulating density, refers to the density converted from the sum of hydrostatic column pressure and circulating friction resistance in the circulating process, namely: the bottom hole pressure during circulation is converted into density according to the well depth, and ECD is pd/(gh).
Before cementing, the connection between the well team killing manifold is disconnected, and the connection mode shown in figure 3 is established. If there is no turnip head on site, a rotating control head (RCD)18 can be installed above the blowout preventer 4 to seal off the annulus to form a closed loop system, so the second cycle flow (fig. 3) is: connecting a well cementation pump 2 and a water tank 1 to a cement head 14, and pumping well cementation fluid (flushing fluid, spacer fluid, cement slurry, plug pressing fluid and the like) into a drill rod (casing) 15 through the well cementation pump 2; a conventional drill pump 3 is connected to a circulation tank 13 and then to a cementing head 14, displacement fluid is pumped from the drill pump 3 into a drill pipe (casing) 15, and fluid in the annulus 17 enters the choke manifold 10 via a rotating control head (RCD)18 and then returns to the circulation tank 13 via a vibrating screen 12. In order to reduce the influence of loss of cement during the waiting period, a supply pump 9 is additionally arranged in front of the choke manifold 10 and used for supplying pressure to the annulus during the waiting period.
As shown in fig. 3, a rotating control head (RCD)18 is mounted above the wellhead blowout preventer stack 14 for enclosing the annulus to form a closed loop system; after being connected with a rotary control head (RCD)18, the choke manifold 10 is connected with an automatic controller 11, and the opening of the choke manifold 10 is adjusted to adjust the back pressure, so that the bottom hole pressure is controlled within the range of the formation pressure of a narrow density window; the middle of the throttle manifold 10 and a rotary control head (RCD)18 is connected with a three-way connecting piece 19, and the supply pump 9 is connected with the three-way connecting piece 19 and used for supplying pressure loss caused by loss of cement slurry weight in the well cementation and coagulation waiting process.
The utility model discloses a narrow density window stratum well cementation control system. The system comprises a soft part and a hard part, and the bottom hole pressure is controlled within a formation pressure range of a narrow density window through the combination of the soft part and the hard part. The optimization design of the related parameters such as density, discharge capacity, back pressure and the like of the well cementation fluid with a narrow density window ensures that the back pressure is not applied as much as possible in the grouting process, and reduces the possibility of leakage; applying back pressure according to a design value in the process of stopping the pump, and maintaining the bottom hole pressure constant; in the process of waiting for setting, applying back pressure according to the pressure change rule in the weight loss process of the cement paste to make up for the pressure loss in the weight loss process; when the leakage happens suddenly, a multi-time grouting method or wellhead reinjection is adopted; during sudden overflow, back pressure is applied through the automatic throttle manifold, and the influence of the overflow on the well cementation quality is reduced.
The utility model discloses a to detailed "soft" designs such as well cementation fluid density, discharge capacity, back pressure, combine hardware system (automatic choke manifold) to adjust the advantage of back pressure as required in real time, with cementing, wait to congeal within well cementation in-process well bottom pressure control safety density window, have easy operation, the practicality strong, the characteristics of easily promoting, be applicable to narrow density window stratum well cementation construction.
To summer up, the utility model provides a pair of narrow density window stratum well cementation control system compares with conventional well cementation, be applied to whole well cementation in-process with the closed loop thought, through the narrow density window stratum targeted carry on density, discharge capacity, parameter design and accurate control such as back pressure, can effectively guarantee well cementation water injection cement and wait to congeal in-process well bottom pressure in narrow density window stratum pressure range, realized that narrow density window stratum safety is guaranteed the quality well cementation, and the operation is simple, the practicality is strong characteristics, and is suitable for the on-the-spot popularization and application.
It is to be understood that the disclosed embodiments are not limited to the particular structures, process steps, or materials disclosed herein but are to be extended to equivalents thereof as would be understood by those of ordinary skill in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Although the embodiments of the present invention have been disclosed, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A narrow density window formation cementing control system, the system comprising:
the automatic controller is used for generating a pressure adjusting instruction when overflow or leakage occurs in the process of well cementation and cement injection;
the choke manifold is connected with the automatic controller and used for executing the pressure adjusting instruction so as to ensure that the bottom pressure is in the range of the formation pressure with a narrow density window in the process of well cementation and cement injection;
and the pressure compensating pump is connected with the throttling manifold through a three-way connecting piece and is used for applying back pressure according to a wellhead back pressure value in the waiting coagulation process so as to ensure that the bottom pressure is in a narrow density window stratum pressure range in the waiting coagulation process.
2. The narrow density window formation cementing control system of claim 1, wherein the system comprises:
the vibrating screen is connected with the throttling manifold and is used for filtering solid phases in mud;
the circulating tank is connected with the vibrating screen and used for storing drilling fluid to meet the circulating requirement;
the drilling pump is connected with the circulating tank and is used for providing necessary energy for the circulation of the drilling fluid and conveying the drilling fluid into a drilling tool at certain pressure and flow rate to complete the whole circulation process;
the cementing head is connected with the drilling pump and is used for special tools for injecting cement slurry and releasing a rubber plug, and the cementing head is arranged at the top end of the casing pipe when cementing;
the well cementation pump is connected with the cementing head and used for providing power for well cementation construction operation;
the water tank is connected with the well cementation pump;
the blowout preventer is connected with the cementing head, belongs to a well control device and is used for preventing the well blowout from generating and ensuring the construction safety;
the casing head is connected with the blowout preventer through a four-way connecting piece and is used for supporting the gravity of a technical casing and an oil layer casing;
a casing connected to the casing head to provide a passageway for flow from the producing formation to the surface.
3. The narrow density window stratigraphic well cementation control system of claim 2, wherein when a radish head is installed at a well cementation site, an annulus is sealed by the radish head, and three ends of the three-way connecting piece are respectively connected with the throttling manifold, the pressure compensating pump and the casing head.
4. The narrow density window subterranean formation cementing control system of claim 2, wherein a rotating control head is installed above the blowout preventer when no radish head is installed at the cementing site, thereby isolating the annulus.
5. The narrow density window formation cementing control system of claim 1, wherein the system comprises:
the first flat plate valve is connected between the pressure supplementing pump and the three-way connecting piece;
and the second flat plate valve is connected between the throttle manifold and the three-way connecting piece.
6. The narrow density window subterranean cementing control system of claim 1, wherein said system comprises:
and the cement slurry density determining device is used for determining the cement slurry density in the well cementation and cementing process according to the actual drilling pressure window in the well drilling process.
7. The narrow density window subterranean cementing control system of claim 1, wherein said system comprises:
and the waiting solidification process control device is used for calculating the wellhead back pressure value in the waiting solidification process, and generating a pressure supplementing instruction according to the wellhead back pressure value so as to control the pressure supplementing pump to apply back pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123376003.XU CN217501618U (en) | 2021-12-29 | 2021-12-29 | Narrow density window stratum well cementation control system |
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