CN112963139B - Wellhead determining method, device, equipment and storage medium based on single cylinder and multiple wells - Google Patents

Abstract

The application discloses a wellhead determining method, device and equipment based on single cylinder multiple wells and a storage medium, and belongs to the field of petroleum exploration and development. The method comprises the following steps: acquiring well position data of n oil-gas wells which are drilled completely on the same exploration and development platform from a database; calculating the wellhead priority of each of at least two standby wellheads which are positioned on the same exploration and development platform with the n oil gas wells based on well position data; generating a predetermined wellbore trajectory corresponding to a target alternate wellhead having a maximum wellhead priority based on the well location data; and when the preset borehole track meets the drilling deployment condition of the single-barrel multi-well, determining the target standby wellhead as a development wellhead to be drilled. According to the method, the development wellhead to be drilled is reasonably determined by the computer equipment based on the environment of rolling exploration and development, so that a great amount of time and effort are not required for a designer to carry out manual distribution design of the wellhead, and the efficiency of wellhead distribution design is improved.

Description

Wellhead determining method, device, equipment and storage medium based on single cylinder and multiple wells

Technical Field

The application relates to the field of petroleum exploration and development, in particular to a wellhead determining method, device and equipment based on single cylinder multiple wells and a storage medium.

Background

The problem of wellhead selection in a rolling exploration and development mode is always one of the main problems of offshore oilfield dense wellhead cluster well drilling.

In order to improve the utilization and service life of the above-mentioned artificial islands or offshore platforms, marine drilling has been mainly performed in recent years in a single-barrel multi-well manner, wherein a single-barrel multi-well means that two or more wellbores into a hydrocarbon reservoir are drilled in one wellbore.

However, because of well placement encryption, the complexity of well head distribution design is significantly increased when implementing a single-barrel multi-well layout, and a great deal of time and effort are required by designers to implement the well head distribution design, which is inefficient.

Disclosure of Invention

The embodiment of the application provides a wellhead determining method, device, equipment and storage medium based on single-cylinder multi-well, which can reasonably determine a development wellhead to be drilled based on the environment of rolling exploration and development by computer equipment, does not need to spend a great deal of time and effort for manually distributing and designing the wellhead, and improves the efficiency of wellhead distribution and design. The technical scheme is as follows:

according to one aspect of the application, there is provided a wellhead determining method based on a single-barrel multi-well, applied to a computer device, the method comprising:

Acquiring well position data of n oil and gas wells which are drilled on the same exploration and development platform from a database, wherein the well position data indicate well drilling deployment information of the oil and gas wells;

calculating the wellhead priority of each of at least two standby wellheads which are positioned on the same exploration and development platform with n oil gas wells based on well position data, wherein n is a positive integer;

generating a preset borehole track corresponding to a target standby wellhead with the maximum wellhead priority based on well position data, wherein the preset borehole track refers to a designed track from the ground to the bottom of a well to be drilled;

and when the preset borehole track meets the drilling deployment condition of the single-barrel multi-well, determining the target standby wellhead as a development wellhead to be drilled.

According to another aspect of the present application there is provided a single-barrel multi-well based wellhead determination device, the device comprising:

the acquisition module is used for acquiring well position data of n oil and gas wells which are drilled on the same exploration and development platform from a database, wherein the well position data indicate drilling deployment information of the oil and gas wells;

the calculation module is used for calculating the wellhead priority of each of at least two standby wellheads which are positioned on the same exploration and development platform with n oil gas wells based on well position data, wherein n is a positive integer;

The generation module is used for generating a preset borehole track corresponding to a target standby wellhead with the maximum wellhead priority based on well position data, wherein the preset borehole track refers to a designed track from the ground to the bottom of a well to be drilled;

and the determining module is used for determining the target standby wellhead as a development wellhead to be drilled when the preset wellbore track meets the drilling deployment condition of the single-barrel multi-well.

According to another aspect of the present application, there is provided a computer apparatus including: a processor and a memory storing a computer program loaded and executed by the processor to implement a single-barrel multi-well based wellhead determination method as described above.

According to another aspect of the present application, there is provided a computer readable storage medium having a computer program stored therein, the computer program being loaded and executed by a processor to implement a single-barrel multi-well based wellhead determination method as described above.

According to another aspect of the present application, a computer program product is provided, the computer program product comprising computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device performs the single-barrel multi-well-based wellhead determination method as described above.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

the method comprises the steps that well position data of n oil gas wells on the same exploration and development platform are obtained from a database by computer equipment, a target standby well head is screened out from at least two standby well heads on the exploration and development platform based on the well position data, then a preset well hole track corresponding to the target standby well head is generated based on the well position data, when the preset well hole track meets the single-barrel multi-well drilling deployment condition, the target standby well head is determined to be a development well head to be drilled, a designer does not need to spend a great deal of time and effort to carry out manual distribution design of the well head, namely a reasonable development well head is determined based on environmental data of rolling exploration and development, efficiency of well head distribution design is improved, site construction can be guided better, and blindness of drilling design is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 illustrates a schematic diagram of a computer system provided in accordance with an exemplary embodiment of the present application;

FIG. 2 illustrates a flow chart of a single-barrel multi-well based wellhead determination method provided by an exemplary embodiment of the present application;

FIG. 3 illustrates a flow chart of a single-barrel multi-well based wellhead determination method provided in accordance with another exemplary embodiment of the present application;

FIG. 4 illustrates a schematic diagram of a wellhead layout on an exploration and development platform provided by an exemplary embodiment of the present application;

FIG. 5 illustrates a schematic diagram of a single-cartridge multi-well based wellhead determination device provided in accordance with an exemplary embodiment of the present application;

fig. 6 shows a schematic structural diagram of a computer device according to an exemplary embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

First, several terms related to the present application will be described:

the rolling exploration and development is a rapid exploration method for simplifying and evaluating exploration and accelerating the construction of the productivity of a new oil field aiming at oil and gas fields with complex geological conditions. The method is characterized in that on the basis of a few exploratory wells and early reserve estimation and an integral knowledge of an oil field, a high-yield enrichment block is put into development preferentially, and development is extended forward; meanwhile, the exploration work of the new layer system and the new region block is continued to be deepened in the development while the key block breaks through, the problem of leaving behind in the evaluation of the oil-gas field is solved, and the edge expansion and the connection are realized. Such a survey development program of "development in exploration", called rolling survey development.

And a shaft, a cylindrical four-wall or a space which is communicated with the ground surface and is formed by drilling the drill bit from the ground surface to a certain well depth.

Reservoir refers to the basic accumulation of oil with the same pressure system in a single trap. If only petroleum is accumulated in one trap, the trap is called an oil reservoir; only natural gas is accumulated, known as a gas reservoir. The trap is a place which can prevent the oil gas from continuing to move and can gather in the place; the trap consists of three parts: reservoir, cap, and barrier to hydrocarbon accumulation by preventing hydrocarbon from continuing migration.

The directional well is deviated from the vertical line of the wellhead by a certain distance along the pre-designed well track, and the well reaching the target is drilled. Cluster well means that two or more directional wells are planned to be drilled on a well site or drilling platform, and a vertical well can be included. Wherein, the well heads of all wells are less than a few meters apart, and the well bottoms of all wells extend to different directions.

The directional drilling method is to use special deflecting tool and to match with certain technological measures to make the well bore deflect in preset direction. Cluster drilling is to drill multiple wells at the same well site by using a cluster drilling machine by using a directional drilling technology.

A target point refers to a predetermined target point of the well, which may also be referred to as the final direction of the wellbore trajectory, e.g., one target is the first end point of the wellbore trajectory and two targets are the second end point of the wellbore trajectory.

The wellbore is tracked, and a well is drilled from a surface wellhead location to a subsurface target area. A wellbore trajectory, a solid-drilled wellbore axis.

Sounding, the length of the wellbore from any point of the wellbore axis to the well, generally indicated by the letter L, in meters (m) or feet.

The well inclination angle, the angle between the borehole direction line at a point and the gravity line passing through that point, is generally indicated by α, in degrees (°).

The well inclination azimuth angle is the angle rotated clockwise by taking the north azimuth line as the starting edge to the well inclination azimuth line, and is usually thatExpressed in units of degrees.

The well deviation change rate refers to the absolute change value of the well deviation angle in a unit well section, and the general units are DEG/10 m, DEG/30 m and DEG/100 m.

The well deviation azimuth change rate refers to the absolute change value of the well deviation azimuth in a unit well section, and the general units are degrees/10 m, degrees/30 m and degrees/100 m.

The vertical depth refers to the vertical depth of the point, generally denoted by H, in m.

The full angle change rate refers to the angle change of the three-dimensional space in a unit well section, and the common unit is the degree/30 m.

The horizontal length refers to the projected length of the wellbore length from the wellhead to the survey point on the horizontal plane, generally denoted by S.

The horizontal displacement, i.e. the distance projected to the wellhead at a point on the horizontal plane of the borehole axis, is also referred to as the closure distance, and is generally indicated by a.

The apparent translation is the horizontal displacement of a point on the well on a vertical projection plane, and the common unit is m. Wherein the closer the apparent translation is to the horizontal displacement, the better the wellbore azimuth control is demonstrated.

The deflecting point refers to the starting point hole depth of artificial deflecting drilling started by using a deflecting tool, namely the starting point of a deflecting hole section. The end point of the deflecting refers to the end point hole depth of the artificial deflecting drilling starting by adopting a deflecting device, namely the end point of the deflecting hole section.

The declivity point refers to the starting point hole depth of the curvature of the drill hole, namely the starting point of the declivity hole section, which is reduced by adopting a manual bending method. The drilling hole can be inclined by adopting special inclined making devices such as eccentric wedges, mechanical continuous inclined making devices, screw drills and the like, and inclined drilling tools such as a heavy weight drilling tool, a pendulum drilling tool, a universal joint drilling tool and the like which are reformed by adopting conventional drilling tools. The inclined end point refers to the end point hole depth of reducing the bending degree of the drilling hole by adopting a manual bending method, namely the end point of the inclined hole section.

Bottom hole point refers to the hole depth at the bottom of the well.

The well-defined ballasted stratum is a new stratum in the third century, mainly comprises variegated sandstone and mudstone, and is usually formed by mutually layering, and is generally 556-1100 m thick and 1653 m thick, and is in integrated contact with the ceramic group in the next pot.

The stratum of the liberal pottery group is a new stratum in the third century, mainly comprises variegated sandstone and mudstone, and comprises gravel sandstone and conglomerate with the thickness of 79-956 m.

The eastern camping group stratum is a third advanced stratum, lithology is purple red, reddish brown, gray green mudstone and sandstone interbedded, the local carbon mudstone, the oil shale and the limestone are generally 600-800 m thick, and finally 1000-1500 m thick, and the eastern camping group stratum is in parallel non-integrated contact with the subvomica river street group or is covered on the older stratum.

The sand river street group belongs to the new generation, consists of a set of dark-colored sand shale mainly comprising gray and dark gray shale, has the thickness of more than 2000 meters, is a main raw oil rock system, and is divided into four sections from bottom to top.

The equivalent density of drilling fluid is the most common method for calculating the formation pressure coefficient and the drilling fluid density in the petroleum drilling industry, and refers to the drilling fluid density required for just balancing the pressure of petroleum, natural gas or water layer in a certain depth of the formation.

The oil and gas well casing comprises a surface casing, a technical casing and an oil layer casing. The surface casing is the outermost casing in the oil and gas well casing program, and is drilled to bedrock below the surface soil layer after drilling holes or to a certain depth and then is put into the surface casing. Surface casing is casing that is used to prevent collapse, contamination, and invasion of upper formation fluids in the upper surface loose layers of the wellbore and is used to install wellhead blowout preventers.

The technical casing, also known as the middle casing, is one or two layers of casing in the middle of the oil and gas well casing procedure, and is positioned between the surface casing and the production casing. Technical casing is casing run in due to formation complexity or limitations of drilling technology. In the oil-gas well with larger well depth, the method plays roles of isolating stratum and protecting well bodies on stratum which is easy to collapse, easy to leak, high pressure, contain salt and the like in the middle well section of the well bore. The technical sleeve is put into the well casing to ensure that the well bore at the lower part is drilled smoothly, and the safety of drilling an oil inlet gas layer can be ensured.

Casing, also known as production casing, is the last casing in the oil and gas well casing program. The oil layer casing is directly below the oil and gas layer from the well head, isolates oil and gas from all bottom layers, creates a firm passage for oil, gas and water from the well bottom to the well head, and ensures that the oil and gas pressure is not leaked. The running depth of the casing is basically the drilling depth.

Cementing is a process in which a casing is lowered into a drilled wellbore, and cement slurry is injected into an annular space between the casing and the wellbore to consolidate the casing and the formation into a single body.

The drilling period refers to the whole time from the first drilling to the completion of drilling in the well, and is an important technical index for reflecting the drilling speed.

And (3) completing drilling, namely finishing drilling when all footage and well depth of the well completion reach geological design requirements. The footage is a length value obtained by drilling and taking meters as measurement units, and reflects the progress condition index of the mining or drilling work. Illustratively, the drilling length within a working shift (i.e. 8 hours), known as shift footage, and also daily footage, month footage, year footage, etc., i.e. the footage may be calculated separately for each work cycle, day and night, month, quarter, year; the total depth of a drill bit is called the drill bit penetration.

The cement slurry is working fluid used in well cementation, and the cement slurry has the function of well cementation. The well cementation operation is to inject cement slurry into the annular space between the well wall and the casing pipe from the casing pipe and to make the annular space return to a certain height, namely the annular space cement slurry returns to the depth, and then the cement slurry becomes cement stone to solidify the well wall and the casing pipe.

FIG. 1 shows a schematic diagram of a computer system 100 provided by an exemplary embodiment of the present application, the computer system 100 including a drilling and exploration system 120, a database 140, a server cluster 160, and a terminal 180.

The drilling exploration system 120 is composed of devices for exploration drilling, and can collect drilling data, such as data of sounding, well inclination angle, well inclination azimuth angle, well inclination change rate, well inclination azimuth change rate, vertical depth, full angle change rate, horizontal length, horizontal displacement, apparent translation, deflecting point, deflecting end point, stratum, geology, oil and gas well casing deployment and the like during drilling. The well data includes well location data, which is exemplary of well location data collected by the drilling survey system 120, and which refers to geographical data of the well, for example, well location data may include wellhead location, wellbore location, and formation, geology, etc. where the wellbore is located.

A wired or wireless communication link exists between the drilling exploration system 120 and the database 140, and the drilling exploration system 120 transmits and stores the acquired drilling data into the database 140. The database 140 stores drilling data for at least two wells.

The database 140 may also be in wired or wireless communication with the server cluster 160, and the server cluster 160 may obtain well drilling data from the database 140 and analyze the well drilling data to obtain desired data. Illustratively, the server cluster 160 obtains n-well drilling data from a database, and screens out development wellheads to be drilled from the backup wellheads based on the n-well drilling data.

The server cluster 160 is provided with a display device, and the server cluster 160 can display analysis data of a development wellhead to be drilled through the display device, for example, display a predetermined wellbore track corresponding to the development wellhead to be drilled on the display device, or perform a construction scheme when drilling based on the development wellhead to be drilled. Alternatively, the server cluster 160 may also communicate with the terminal 180 via a wired or wireless connection, and the analysis data of the development wellhead to be drilled may be displayed on a display device of the terminal 180.

Optionally, the drilling exploration system 120 further comprises a console of the drilling equipment; the server cluster 160 may also send the analysis data of the development wellhead to be drilled to the console of the drilling equipment for presentation.

It should be noted that, a client is installed and operated on the server cluster 160 or the terminal 180, and the client may implement triggering of a data processing function of drilling, for example, triggering functions of selecting a development wellhead to be drilled, generating a wellbore track corresponding to the development wellhead to be drilled, and the like.

Server cluster 160 may include at least one of a server, a plurality of servers, a cloud computing platform, and a virtualization center. By way of example, the terminal 180 may include at least one of a smart phone, a tablet computer, an electronic book reader, an MP3 (Moving Picture Experts Group Audio Layer III, moving picture experts compression standard audio layer 3) player, an MP4 (Moving Picture Experts Group Audio Layer IV, moving picture experts compression standard audio layer 4) player, a laptop and desktop computer, a notebook computer. Those skilled in the art will appreciate that the number of terminals 180 may be greater or lesser. For example, the number of the terminals 180 may be only one, or the number of the terminals 180 may be tens or hundreds, or more, and the number and the device type of the terminals 180 are not limited in the embodiment of the present application.

Fig. 2 shows a flowchart of a single-barrel multi-well-based wellhead determining method according to an exemplary embodiment of the present application, where the method is applied to a computer device, and the computer device may include a server and a terminal, and the method is applied to the server shown in fig. 1, for illustration, and includes:

step 201, well position data of n oil-gas wells which are drilled completely on the same exploration and development platform are obtained from a database.

Each artificial island or offshore platform can serve as an exploration and development platform, and each exploration and development platform is correspondingly stored with development data on the exploration and development platform, wherein the development data comprise well position data of an oil-gas well; when a development wellhead to be drilled is selected on a target exploration and development platform, a server acquires well position data of n oil and gas wells which are drilled on the target exploration and development platform from a database, wherein the well position data indicate drilling deployment information of the oil and gas wells, and n is a positive integer. The database is illustratively provided by the geological reservoir sector.

Step 202, calculating wellhead priority of each of at least two standby wellheads on the same exploration and development platform as the n oil and gas wells based on well position data.

At least two standby wellheads are arranged on the exploration and development platform where the n oil gas wells are located, and the at least two standby wellheads are used for providing development wellheads for development of subsequent oil gas wells in the rolling exploration and development process; the server calculates a wellhead priority for each of the at least two backup wellheads based on the well location data.

Illustratively, the server prioritizes wellhead use of at least two spare wellheads on the above-described exploration and development platform in accordance with cluster well placement rules. Illustratively, the cluster well layout principle may include at least one of a nearby principle and a disjoint horizontal displacement minimum distance method.

Optionally, the server determines a geological target to be drilled; calculating the horizontal projection distance of the connecting line between each standby wellhead and the geological target; calculating the number of intersecting points between the horizontal projection of the connecting line corresponding to each spare wellhead and the horizontal projection of the well track of each of the n oil and gas wells; and calculating the wellhead priority of each standby wellhead according to the horizontal projection distance and the number of intersecting points.

Illustratively, a priority index model of the wellhead is set in the server, and the priority index model is constructed according to the horizontal projection distance and the number of intersecting points, and can be expressed by the following formula:

F＝a*(D-Dmin)/(Dmax-Dmin)+b*Count；

Wherein F represents a wellhead priority index; d is the horizontal projection distance of the connecting line between the spare wellhead and the geological target; dmin refers to the minimum horizontal projection distance of the connecting line between the standby wellhead and the geological target; dmax is the maximum horizontal projection distance of the connecting line between the standby wellhead and the geological target; count refers to the number of intersections between the horizontal projection of the connection and the horizontal projection of the shallow wellbore trajectory of the oil and gas well that has been drilled; a. b is a weight coefficient.

Alternatively, the server determines a small-sized wellhead or a wellhead that has been drilled but is not fully utilized as a priority backup wellhead.

Step 203, generating a predetermined wellbore trajectory corresponding to the target alternate wellhead having the greatest wellhead priority based on the well location data.

The server is provided with an anti-collision rule and an optimal track rule, and the server generates a preset borehole track below a target standby wellhead meeting the anti-collision rule and the optimal track rule based on well position data. Wherein, the predetermined borehole track refers to a designed track from the surface to the bottom of the well to be drilled.

Illustratively, the above-described anti-collision rules are used to avoid collisions of the predetermined wellbore trajectory with the actual wellbore trajectory of the n hydrocarbon wells. Illustratively, the above-described optimal trajectory rules are used to facilitate the implementation of a predetermined wellbore trajectory for drilling.

Step 204, determining the target backup wellhead as a development wellhead to be drilled when the predetermined wellbore trajectory meets the single-barrel multi-well drilling deployment conditions.

The server is provided with drilling deployment conditions of a single barrel and multiple wells; and when the preset borehole track meets the drilling deployment condition of the single-barrel multi-well, determining the target standby wellhead as a development wellhead to be drilled.

Exemplary, the single-barrel multi-well drilling deployment conditions include that the unutilized size of the target spare wellhead is greater than the required run-in surface casing size of the predetermined wellbore trajectory and meets the minimum annulus clearance requirement for cementing; when the required size of the casing to be placed into the surface layer of the preset well track is smaller than the unutilized size of the target spare well head and the requirement of the minimum annular clearance of well cementation is met, the server determines the target spare well head as a development well head to be drilled. The requirement of the minimum annular clearance for well cementation refers to that the clearance of the annular space between the casing and the well bore is larger than or equal to the minimum clearance meeting the well cementation construction condition.

And 205, when the preset borehole track does not meet the drilling deployment condition of the single-barrel multi-well, determining the standby wellhead with the largest wellhead priority in the rest standby wellheads as a target standby wellhead, and starting to execute the step of generating the preset borehole track corresponding to the target standby wellhead with the largest wellhead priority based on the well position data to determine the development wellhead to be drilled.

When the predetermined wellbore trajectory does not meet the single-barrel multi-well drilling deployment condition, the server determines the standby wellhead with the largest wellhead priority among the remaining standby wellheads as the target standby wellhead, and returns to step 203 to be re-executed to determine the development wellhead to be drilled.

Illustratively, when the desired run-in casing size for the predetermined wellbore trajectory is greater than the unused size of the target backup wellhead, the server determines the backup wellhead having the greatest wellhead priority among the remaining backup wellheads as the target backup wellhead, and returns to step 203 for re-execution to determine the development wellhead to be drilled.

Illustratively, the remaining spare wellhead refers to the other spare wellhead among the at least two spare wellhead except the target spare wellhead calculated in the step.

After determining the development wellhead to be drilled, the server also determines a single-barrel, multi-well drilling embodiment based on the trajectory data of the predetermined wellbore trajectory, the drilling embodiment including at least one of a placeholder drill form and a shared surface wellbore form. Wherein, the space occupying drilling tool form refers to that each well in a well bore has an independent well bore; the common surface wellbore form refers to a wellbore in which there are at least two wells sharing a surface.

For example, if the drilling deployment conditions of a single cylinder and multiple wells are not satisfied after multiple rounds of optimization, no other spare well heads are selected on the same exploration and development platform, and according to the geological engineering integration thought, the geological department is suggested to modify well position data and re-optimize.

In summary, according to the method for determining the wellhead based on the single-cylinder multi-well, well position data of n oil-gas wells on the same exploration and development platform are obtained from a database, a target spare wellhead is screened out from at least two spare wellheads on the exploration and development platform based on the well position data, then a preset wellbore track corresponding to the target spare wellhead is generated based on the well position data, when the preset wellbore track meets the drilling deployment condition of the single-cylinder multi-well, the target spare wellhead is determined to be a development wellhead to be drilled, a designer does not need to spend a great deal of time and effort to perform manual allocation design of the wellhead, namely, a reasonable development wellhead is determined based on environmental data of rolling exploration and development, efficiency of wellhead allocation design is improved, site construction can be guided better, and blindness of drilling design is reduced.

Exemplary, if the single-barrel multi-well drilling deployment conditions include the following two: first, a separation coefficient between a predetermined wellbore trajectory to be drilled and an actual wellbore trajectory of an adjacent well is greater than a separation coefficient threshold; if the second casing to be drilled has a size less than the unused size of the target spare wellhead and meets the minimum annular clearance requirement for cementing, step 204 in fig. 2 may include steps 2041 through 2046, and step 205 may include step 2051, as shown in fig. 3, as follows:

Step 2041 calculates a separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well.

In order to avoid collision with the adjacent well, it is necessary to ensure that the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is greater than the separation coefficient threshold, so that the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is calculated first, and when the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is greater than the separation coefficient threshold, step 2042 is performed; otherwise, step 2045 is performed.

In step 2042, when the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is greater than the separation coefficient threshold, a formation pressure of the formation through which the well is to be drilled is predicted based on the trajectory data of the predetermined wellbore trajectory and the real drilling data of the adjacent well in the n-well.

The server predicts a formation structure of the formation through which the well is to be drilled, and a formation pressure of the formation through which the well is to be drilled, based on the trajectory data of the predetermined wellbore trajectory and the real drilling data of adjacent ones of the n hydrocarbon wells. The formation pressure includes formation pore pressure, formation collapse pressure, and formation fracture pressure, commonly expressed in grams per cubic centimeter (g/cm) ³ ) The formation pore pressure refers to the pressure of fluid in the pores of the underground rock. Formation collapse pressure refers to the minimum critical drilling fluid column pressure that maintains the borehole wall stable. Formation fracture pressure refers to the critical bottom hole fluid pressure to which the formation is subjected when hydraulic fractures are created.

In step 2043, a wellbore configuration to be drilled is determined based on the formation pressure and formation configuration of the formation through which the wellbore is to be drilled, the wellbore configuration including a surface casing size to be drilled.

The server determines the well bore structure to be drilled based on formation pressure and formation structure of the formation through which the wellbore trajectory is reserved. Illustratively, under the premise of ensuring the drilling safety, the structural design of the well body is simplified as much as possible so as to reduce the construction difficulty. The wellbore structure may include, for example, a depth of each of at least two wellbore lengths to be drilled, a type of hydrocarbon well casing to be run, a number of hydrocarbon well casings to be run, and a size of hydrocarbon well casing to be run.

Optionally, the server determines the drilling fluid density under the required drilling fluid system according to the formation pressure; the well bore structure to be drilled is determined based on the formation structure and the drilling density. That is, the server performs well optimization design in combination with drilling fluid and well cementing design.

And 2044, determining the target spare wellhead as a development wellhead to be drilled when the size of the surface casing to be drilled is smaller than the unutilized size of the target spare wellhead and the minimum annular clearance requirement of well cementation is met.

The target backup wellhead may be an undeveloped wellhead or a developed but not fully utilized wellhead, for example. And when the size of the surface casing to be drilled is smaller than the unutilized size of the target standby wellhead and the requirement of the minimum annular clearance of well cementation is met, determining the target standby wellhead as a development wellhead to be drilled.

Optionally, if the target backup wellhead is an undeveloped wellhead, the single-barrel multi-well drilling deployment conditions may further include a remaining dimension of the unutilized dimension being greater than a surface casing minimum dimension; when the size of the surface casing to be drilled is smaller than the unused size of the target standby wellhead, calculating the difference between the unused size and the surface casing size to obtain the residual size of the unused size; and when the residual size is larger than the minimum size of the surface casing and the minimum annular clearance requirement of well cementation is met, determining the target standby wellhead as a development wellhead to be drilled.

Step 2045 is performed when the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is less than or equal to the separation coefficient threshold value.

Step 2046, when the predetermined wellbore trajectory does not meet the condition that the surface casing size to be drilled is smaller than the unused size of the target backup wellhead and the minimum annulus clearance requirement for cementing is met, executing step 2051.

That is, step 2051 is performed when the surface casing size to be drilled is greater than the unutilized size of the target backup wellhead, or when the minimum annulus clearance requirement for cementing is not met, or when the surface casing size to be drilled is greater than the unutilized size of the target backup wellhead, and the minimum annulus clearance requirement for cementing is not met.

Step 2051, determining the standby wellhead with the largest wellhead priority in the remaining standby wellheads as a target standby wellhead, executing from the step of generating a predetermined wellbore track corresponding to the target standby wellhead with the largest wellhead priority based on the well position data, and determining a development wellhead to be drilled.

And determining the standby wellhead with the largest wellhead priority in the remaining standby wellheads as a target standby wellhead, returning to the step 203, and re-determining the development wellhead to be drilled.

In summary, according to the wellhead determining method based on the single-cylinder multi-well provided by the embodiment, whether the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is larger than the separation coefficient threshold is firstly determined, so as to ensure that the layout of the wellbore trajectory between the to-be-drilled well and the adjacent well is safe and reasonable, and no collision occurs; and then, carrying out predictive design on the well structure to be drilled, and judging whether the unused size of the target standby well head can accommodate the entering of the surface casing to be drilled, so that the finally determined development well head to be drilled and the development design can be truly implemented.

The method is suitable for wellhead optimization of single-cylinder multi-well drilling design of an artificial island and an ocean platform, comprehensively considers influences of wellhead size, interval, anti-collision safety, well structure, implementation mode and the like on single-cylinder multi-well implementation, optimizes the well track and the well structure for multiple times, aims at reducing drilling design blindness and field implementation difficulty, improves drilling design efficiency and platform wellhead overall utilization rate, prefers single-cylinder multi-well wellhead, and improves comprehensive benefits of the artificial island or the ocean platform.

By way of example, the wellhead determining method based on single-cylinder multi-well provided by the application is exemplified, a development well (namely to be drilled) is deployed in the geology of a certain artificial island, the method is implemented by single-cylinder double-well, the given geological target T1 coordinate is X-1772.46 m, Y-915.98 m, the vertical depth is 2817m, the geological target T2 coordinate is X-1832.46 m, Y-939.98 m, and the vertical depth is 2938m. Referring to fig. 4, there is shown a north wellhead layout of the man-made island described above, with a total of 5 spare wellhead numbers 16, 18, 19, 20, 41.

(1) Wellhead prioritization for use by the spare wellhead.

The number of the existing standby wellheads of the artificial island is 5, as shown in fig. 4, all the artificial islands are positioned on the north side, the sizes are phi 660.4 millimeters (mm) and phi 914.4mm respectively, and the coordinates and the current situation are shown in the following table 1:

TABLE 1

Connecting a geological target T1 with each spare wellhead, calculating wellhead priority indexes used by each wellhead according to the horizontal projection distance of the corresponding connecting line and the number of horizontal projection intersection points of the well tracks of the shallow layers of the oil and gas wells (taking the vertical depth of the well section less than 1000 m), and taking the weight coefficient a=3 and b=1, wherein the results are shown in the following table 2:

TABLE 2

(2) And taking the number 41 as a primary wellhead (namely a target standby wellhead), and optimizing the well track design. With a separation coefficient of more than 1.0 as a constraint condition, optimizing the design of a well track as shown in the following table 3, and meeting the anti-collision requirement:

TABLE 3 Table 3

(3) With the current design of the well track and the adjacent well real drilling condition, the three pressure prediction analysis of the single well stratum is carried out, and the result is shown in the following table 4:

TABLE 4 Table 4

(4) Well bore structure optimization and determination of minimum wellhead size

The main purpose layer of the well is sandThe collapse pressure of the stratum is higher in the second section and the third section, and the potassium salt polymer system drilling fluid is optimized to ensure the stability of the well wall, and the density is not lower than 1.35g/cm ³ . The clay group stratum is a weak stratum typical of the block, well leakage is easy to occur due to special lithology, and the density of drilling fluid is generally not higher than 1.30g/cm ³ Therefore, the well needs to be put into a layer of technical casing to seal the stratum of the ceramic group so as to ensure the drilling safety. The well bore structure is designed as follows in table 5:

TABLE 5

The production casing size is phi 139.7mm, the surface casing size is phi 339.7mm from bottom to top, the theoretical minimum wellhead size is not less than phi 914.4mm, the initially selected wellhead size of No. 59 is phi 660.4mm, and two groups of phi 244.5mm casing strings are put into the production casing, so that the well cannot be implemented, and similarly, the wellhead size of No. 16 which is ordered as C2 is limited in size and cannot be implemented.

(5) Re-selecting wellheads and optimizing wellbore trajectory designs

According to the priority order, a No. 20 wellhead with the size phi 914.4mm is selected, a separation coefficient > 1.0 is used as a constraint condition, the borehole track design is optimized as shown in the following table 6, and the anti-collision requirement is met:

TABLE 6

(6) With the current design of the well track (i.e. the reserved well track) and the actual drilling situation of the adjacent well, the three pressure prediction analysis of the single well stratum is carried out, and the results are shown in the following table 7:

TABLE 7

Stratum layer	Pore pressure g/cm 3	Collapse pressure g/cm 3	Burst pressure g/cm 3
				Brightening ballast set	0.93-1.04	0.95-1.17	> 1.60 (vertical depth > 870 m)
Ceramic set	0.93-1.04	0.95-1.17	＞1.71
				Dongying group	0.95-1.05	1.01-1.30	＞1.77
Sand section	1.03-1.05	1.24-1.31	＞1.83
				Sand two section	1.00-1.03	1.16-1.30	＞1.82
Sand three-section	1.00-1.03	1.24	＞1.83

(7) Well bore structure optimization

The maximum well inclination angle of the newly designed well track is reduced to 41 degrees, the corresponding formation collapse pressure of the lower stratum is slightly reduced, but is still higher than the expected drilling fluid density of the liberal ceramic group stratum, so that a layer of technical sleeve is required to be put into to seal the liberal ceramic group stratum, the well structure is designed to be three-open, the sylvite polymer system drilling fluid is adopted, and the well structure is designed as shown in the following table 8:

TABLE 8

The size of the surface sleeve is phi 339.7mm, and the size of the selected No. 20 wellhead is phi 914.4mm, so that the implementation requirement is met. The well track is designed to be shallow 170m and is implemented by adopting a space occupying drilling tool mode.

(8) Determining wellhead preference results

The No. 20 wellhead is the optimal wellhead for implementing single-cylinder multi-well by the current geological target, and the implementation mode is that a space occupying drilling tool is adopted to drill a well hole in the wellhead.

In summary, the wellhead determining method based on single-cylinder multi-well provided by the embodiment is suitable for wellhead optimization of single-cylinder multi-well drilling design of an artificial island and an ocean platform, comprehensively considers influences of wellhead size, interval, anti-collision safety, well structure, implementation mode and the like on single-cylinder multi-well implementation, optimizes the well track and well structure for multiple times, and aims to reduce drilling design blindness and field implementation difficulty, improve drilling design efficiency and overall utilization rate of the platform wellhead, optimize the single-cylinder multi-well wellhead and improve comprehensive benefits of the artificial island or the ocean platform.

FIG. 5 illustrates a block diagram of a single-cartridge, multi-well based wellhead determination device provided in accordance with an exemplary embodiment of the present application. The apparatus may be implemented as part or all of a server or terminal by software, hardware, or a combination of both. The device comprises:

The acquiring module 301 is configured to acquire well position data of n oil and gas wells that have been drilled on the same exploration and development platform from a database, where the well position data indicates drilling deployment information of the oil and gas wells;

the calculation module 302 is configured to calculate, based on well position data, a well head priority of each of at least two spare well heads that are in the same exploration and development platform as n oil and gas wells, where n is a positive integer;

a generating module 303, configured to generate, based on the well location data, a predetermined well track corresponding to a target backup well with a maximum well head priority, where the predetermined well track refers to a design track from the surface to the bottom of the well to be drilled;

a determining module 304 for determining the target backup wellhead as a development wellhead to be drilled when the predetermined wellbore trajectory meets a single-barrel multi-well drilling deployment condition.

In some embodiments, the single-barrel multi-well drilling deployment conditions include that the surface casing to be drilled is smaller in size than the unused size of the target backup wellhead and meets the cementing minimum annulus clearance requirement; a determining module 304, configured to:

predicting formation pressure of a stratum through which a well is to be drilled based on track data of a preset well track and real drilling data of adjacent wells in the n oil-gas wells;

Determining a well structure to be drilled according to the stratum pressure and stratum structure of the stratum through which the well to be drilled passes, wherein the well structure comprises the surface casing size to be drilled;

and when the size of the surface casing to be drilled is smaller than the unutilized size of the target standby wellhead and the requirement of the minimum annular clearance of well cementation is met, determining the target standby wellhead as a development wellhead to be drilled.

In some embodiments, the target backup wellhead is an undeveloped wellhead, and the single-barrel multi-well drilling deployment conditions further include a remaining dimension of the unutilized dimension being greater than a surface casing minimum dimension and meeting a cementing minimum annulus clearance requirement; a determining module 304, configured to:

when the size of the surface casing to be drilled is smaller than the unused size of the target standby wellhead, calculating the difference between the unused size and the surface casing size to obtain the residual size of the unused size;

and when the residual size is larger than the minimum size of the surface casing and the minimum annular clearance requirement of well cementation is met, determining the target standby wellhead as a development wellhead to be drilled.

In some embodiments, the single-barrel multi-well drilling deployment condition further comprises a separation coefficient between a predetermined wellbore trajectory to be drilled and an actual wellbore trajectory of an adjacent well being greater than a separation coefficient threshold; a determining module 304, configured to:

Calculating a separation coefficient between a predetermined wellbore trajectory and an actual wellbore trajectory of an adjacent well;

when the separation coefficient between the predetermined wellbore trajectory and the actual wellbore trajectory of the adjacent well is greater than the separation coefficient threshold, a formation pressure of the formation through which the well is to be drilled is predicted based on the trajectory data of the predetermined wellbore trajectory and the real drilling data of the adjacent well in the n hydrocarbon wells.

In some embodiments, the computing module 302 is configured to:

determining a geological target point to be drilled;

calculating the horizontal projection distance of the connecting line between each standby wellhead and the geological target;

calculating the number of intersecting points between the horizontal projection of the connecting line corresponding to each spare wellhead and the horizontal projection of the well track of each of the n oil and gas wells;

and calculating the wellhead priority of each standby wellhead according to the horizontal projection distance and the number of intersecting points.

In some embodiments, the determining module 304 is further configured to:

and when the preset well track does not meet the drilling deployment condition, determining the standby well head with the largest well head priority in the rest standby well heads as a target standby well head, executing from the step of generating the preset well track corresponding to the target standby well head with the largest well head priority based on well position data, and determining the development well head to be drilled.

In some embodiments, the determining module 304 is further configured to:

a single-barrel multi-well drilling embodiment is determined based on the trajectory data of the predetermined wellbore trajectory, the drilling embodiment including at least one of a placeholder drilling tool form and a shared surface wellbore form.

In summary, according to the wellhead determining device based on single-cylinder multi-well provided by the embodiment, well position data of n oil-gas wells on the same exploration and development platform are obtained from a database, a target spare wellhead is screened out from at least two spare wellheads on the exploration and development platform based on the well position data, then a predetermined wellbore track corresponding to the target spare wellhead is generated based on the well position data, when the predetermined wellbore track meets the drilling deployment condition of single-cylinder multi-well, the target spare wellhead is determined to be a development wellhead to be drilled, a designer does not need to spend a great deal of time and effort to perform manual allocation design of the wellhead, namely, a reasonable development wellhead is determined based on environmental data of rolling exploration and development, efficiency of wellhead allocation design is improved, site construction can be guided better, and blindness of drilling design is reduced.

Fig. 6 shows a schematic structural diagram of a computer device according to an exemplary embodiment of the present application. The computer device may be a device performing the single-barrel multi-well based wellhead determination method as provided by the present application, and the computer device may be a terminal or a server. Specifically, the present application relates to a method for manufacturing a semiconductor device.

The computer apparatus 400 includes a central processing unit (CPU, central Processing Unit) 401, a system Memory 404 including a random access Memory (RAM, random Access Memory) 402 and a Read Only Memory (ROM) 403, and a system bus 405 connecting the system Memory 404 and the central processing unit 401. Computer device 400 also includes a basic input/output system (I/O system, input Output System) 406, which helps to transfer information between various devices within the computer, and a mass storage device 407 for storing an operating system 413, application programs 414, and other program modules 415.

The basic input/output system 406 includes a display 408 for displaying information and an input device 409, such as a mouse, keyboard, etc., for user input of information. Wherein both the display 408 and the input device 409 are coupled to the central processing unit 401 via an input output controller 410 coupled to the system bus 405. The basic input/output system 406 may also include an input/output controller 410 for receiving and processing input from a number of other devices, such as a keyboard, mouse, or electronic stylus. Similarly, the input output controller 410 also provides output to a display screen, a printer, or other type of output device.

The mass storage device 407 is connected to the central processing unit 401 through a mass storage controller (not shown) connected to the system bus 405. The mass storage device 407 and its associated computer-readable media provide non-volatile storage for the computer device 400. That is, the mass storage device 407 may include a computer-readable medium (not shown) such as a hard disk or compact disc read-only memory (CD-ROM, compact Disc Read Only Memory) drive.

Computer readable media may include computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, erasable programmable read-only memory (EPROM, erasable Programmable Read Only Memory), electrically erasable programmable read-only memory (EEPROM, electrically Erasable Programmable Read Only Memory), flash memory or other solid state memory technology, CD-ROM, digital versatile disks (DVD, digital Versatile Disc) or solid state disks (SSD, solid State Drives), other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. The random access memory may include resistive random access memory (ReRAM, resistance Random Access Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others. Of course, those skilled in the art will recognize that computer storage media are not limited to the ones described above. The system memory 404 and mass storage device 407 described above may be collectively referred to as memory.

According to various embodiments of the application, the computer device 400 may also operate by being connected to a remote computer on a network, such as the Internet. I.e., computer device 400 may be connected to a network 412 through a network interface unit 411 coupled to system bus 405, or other types of networks or remote computer systems (not shown) may be coupled to using network interface unit 411.

The memory also includes one or more programs, one or more programs stored in the memory and configured to be executed by the CPU.

In an alternative embodiment, a computer device is provided that includes a processor and a memory having at least one instruction, at least one program, code set, or instruction set stored therein, the at least one instruction, at least one program, code set, or instruction set being loaded and executed by the processor to implement a single-barrel multi-well-based wellhead determination method as described above.

In an alternative embodiment, a computer readable storage medium having stored therein at least one instruction, at least one program, code set, or instruction set loaded and executed by a processor to implement a single-barrel multi-well-based wellhead determination method as described above is provided.

Alternatively, the computer-readable storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), solid state disk (SSD, solid State Drives), or optical disk, etc. The random access memory may include resistive random access memory (ReRAM, resistance Random Access Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others. The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The application also provides a computer readable storage medium, wherein at least one instruction, at least one section of program, code set or instruction set is stored in the storage medium, and the at least one instruction, the at least one section of program, the code set or the instruction set is loaded and executed by a processor to realize the wellhead determination method based on single-barrel multi-well provided by each method embodiment.

The present application also provides a computer program product comprising computer instructions stored on a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device performs the single-barrel multi-well-based wellhead determination method as described above.

It should be understood that references herein to "a plurality" are to two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but rather, the application is to be construed as limited to the appended claims.

Claims (9)

1. A wellhead determining method based on single-cylinder multi-well, which is characterized by being applied to computer equipment, and comprising the following steps:

acquiring well position data of n oil and gas wells which are drilled on the same exploration and development platform from a database, wherein the well position data indicate well drilling deployment information of the oil and gas wells, and n is a positive integer;

determining a geological target point to be drilled;

calculating the horizontal projection distance of the connecting line between each standby wellhead and the geological target;

calculating the number of intersecting points between the horizontal projection of the connecting line corresponding to each spare wellhead and the horizontal projection of the borehole track of each of the n oil-gas wells;

using a priority index model, and calculating the wellhead priority of each standby wellhead according to the horizontal projection distance and the number of intersecting points;

generating a preset borehole track corresponding to a target standby wellhead with the maximum wellhead priority based on the well position data, wherein the preset borehole track refers to a designed track from the ground to the bottom of a well to be drilled;

When the preset borehole track meets the drilling deployment condition of a single cylinder and multiple wells, determining the target standby wellhead as the development wellhead to be drilled;

wherein the priority index model is represented by the following formula:

F＝a*(D-Dmin)/(Dmax-Dmin)+b*Count；

the F represents a wellhead priority index; the D is the horizontal projection distance of a connecting line between the spare wellhead and the geological target; dmin refers to the minimum horizontal projection distance of a connecting line between the standby wellhead and the geological target; the Dmax refers to the maximum horizontal projection distance of a connecting line between the standby wellhead and the geological target; the Count refers to the number of intersecting points between the horizontal projection of the connecting line and the horizontal projection of the shallow well track of the oil and gas well which is drilled completely; a. b is a weight coefficient.

2. The method of claim 1, wherein the single-barrel multi-well drilling deployment conditions include the surface casing to be drilled being smaller in size than the unused size of the target backup wellhead and meeting cementing minimum annulus clearance requirements;

when the preset borehole track meets the drilling deployment condition of a single cylinder and multiple wells, determining the target standby wellhead as the development wellhead to be drilled, wherein the method comprises the following steps:

Predicting formation pressure of the stratum through which the well is to be drilled based on the track data of the preset well track and the real drilling data of adjacent wells in the n oil-gas wells;

determining a well structure to be drilled according to the stratum pressure and stratum structure of the stratum through which the well to be drilled passes, wherein the well structure comprises the surface casing size to be drilled;

and when the size of the surface casing to be drilled is smaller than the unused size of the target standby wellhead and meets the requirement of the minimum annular clearance of well cementation, determining the target standby wellhead as the development wellhead to be drilled.

3. The method of claim 2, wherein the target backup wellhead is an undeveloped wellhead, the single-well multi-well drilling deployment condition further comprising a remaining dimension of the unutilized dimension being greater than a surface casing minimum dimension and meeting the cementing minimum annulus clearance requirement;

when the size of the surface casing to be drilled is smaller than the unused size of the target backup wellhead and meets the requirement of the minimum annular clearance for well cementation, determining the target backup wellhead as the development wellhead to be drilled comprises the following steps:

when the surface casing size to be drilled is smaller than the unused size of the target standby wellhead, calculating a difference value between the unused size and the surface casing size to obtain a residual size of the unused size;

And when the residual size is larger than the minimum size of the surface casing and the minimum annular clearance requirement of well cementation is met, determining the target standby wellhead as the development wellhead to be drilled.

4. The method of claim 2, wherein the single-barrel multi-well drilling deployment condition further comprises a separation coefficient between the predetermined wellbore trajectory to be drilled and an actual wellbore trajectory of an adjacent well being greater than a separation coefficient threshold;

the predicting the formation pressure of the stratum through which the well to be drilled passes based on the track data of the preset well track and the real drilling data of the adjacent wells in the n oil-gas wells comprises the following steps:

calculating a separation coefficient between the predetermined wellbore trajectory and an actual wellbore trajectory of the adjacent well;

and predicting the formation pressure of the stratum through which the well to be drilled passes based on the track data of the preset well track and the real drilling data of the adjacent wells in the n-mouth oil-gas well when the separation coefficient between the preset well track and the actual well track of the adjacent well is larger than the separation coefficient threshold value.

5. The method according to any one of claims 1 to 4, further comprising:

and when the preset borehole track does not meet the drilling deployment condition, determining the standby wellhead with the largest wellhead priority in the rest standby wellheads as the target standby wellhead, executing the step of generating the preset borehole track corresponding to the target standby wellhead with the largest wellhead priority based on the well position data, and determining the development wellhead to be drilled.

6. The method of any one of claims 1 to 4, wherein after determining the target backup wellhead as the development wellhead to be drilled when the predetermined wellbore trajectory meets a single-barrel multi-well drilling deployment condition, comprising:

a drilling embodiment of the single-barrel multi-well is determined based on the trajectory data of the predetermined wellbore trajectory, the drilling embodiment including at least one of a placeholder drilling tool form and a shared surface wellbore form.

7. A single-barrel multi-well based wellhead determination device, the device comprising:

the acquisition module is used for acquiring well position data of n oil-gas wells which are drilled on the same exploration and development platform from a database, wherein the well position data indicate well drilling deployment information of the oil-gas wells, and n is a positive integer;

the calculation module is used for determining a geological target point to be drilled; calculating the horizontal projection distance of the connecting line between each standby wellhead and the geological target; calculating the number of intersecting points between the horizontal projection of the connecting line corresponding to each spare wellhead and the horizontal projection of the borehole track of each of the n oil-gas wells; using a priority index model, and calculating the wellhead priority of each standby wellhead according to the horizontal projection distance and the number of intersecting points;

The generation module is used for generating a preset borehole track corresponding to a target standby wellhead with the maximum wellhead priority based on the well position data, wherein the preset borehole track refers to a designed track from the ground to the bottom of a well to be drilled;

the determining module is used for determining the target standby wellhead as the development wellhead to be drilled when the preset wellbore track meets the drilling deployment condition of a single cylinder multi-well;

wherein the priority index model is represented by the following formula:

F＝a*(D-Dmin)/(Dmax-Dmin)+b*Count；

the F represents a wellhead priority index; the D is the horizontal projection distance of a connecting line between the spare wellhead and the geological target; dmin refers to the minimum horizontal projection distance of a connecting line between the standby wellhead and the geological target; the Dmax refers to the maximum horizontal projection distance of a connecting line between the standby wellhead and the geological target; the Count refers to the number of intersecting points between the horizontal projection of the connecting line and the horizontal projection of the shallow well track of the oil and gas well which is drilled completely; a. b is a weight coefficient.

8. A computer device, the computer device comprising: a processor and a memory storing a computer program to be loaded and executed by the processor to implement the single-barrel multi-well based wellhead determination method of any one of claims 1 to 6.

9. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, which is loaded and executed by a processor to implement the single-barrel multi-well based wellhead determination method according to any of claims 1 to 6.