Temperature-control well drilling method, device and equipment based on double-channel drill rod and medium

Abstract

The invention discloses a temperature-control well drilling method, device and equipment based on a double-channel drill rod and a medium. Obtaining a horizontal shaft transient heat transfer model according to a circulation mode of the double-channel drill rod, wherein the circulation mode represents the flowing direction of fluid in the double-channel drill rod; the shaft temperature is obtained according to the horizontal shaft transient heat transfer model; and performing temperature-controlled drilling based on the shaft temperature. According to the scheme, on the basis of common well drilling, flow characteristics and heat transfer mechanisms in all flow channels in all circulation modes are analyzed, a horizontal shaft transient heat transfer model is obtained, initial and boundary conditions are set, the model is solved through a finite difference method, the shaft temperature is obtained, well drilling parameters are optimized according to the shaft temperature and the model, and temperature control well drilling is conducted.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and particularly to a temperature control drilling method, device, equipment and medium based on a dual-channel drill pipe. Background Art

[0002] Important progress has been made in the exploration and development of ultra-deep oil and gas, which has become the main body of the growth of proven oil and gas reserves in recent years. The drilling and completion technology of ultra-deep horizontal wells has made great progress. With the continuous increase of the drilling depth, the drilling difficulty is also rising continuously. The high-temperature environment downhole in ultra-deep horizontal wells will not only significantly affect the thermal physical properties of drilling fluids, cementing quality, borehole stability and rock-breaking efficiency, but may also lead to the failure of measurement-while-drilling tools, rotary steerable tools and geosteering tools. Therefore, the development of temperature control drilling technology is an important means to prevent accidents in deep drilling operations, and the prediction and control of wellbore temperature is a very important issue.

[0003] In view of the above difficulties, a solution using a dual-channel drill pipe for drilling is proposed. Using a dual-channel drill pipe can allow cuttings to return from the bottom of the well through a separate flow channel, achieving a constant downhole pressure gradient and reducing the torque and resistance generated by buoyancy. Therefore, dual-channel drill pipe drilling is considered to be one of the key technologies for future deep oil and gas drilling. The wellbore temperature has an important impact on the wellbore pressure control and downhole tool selection of dual-channel drill pipe drilling, and it is necessary to have a detailed understanding of its wellbore temperature. As a brand-new drilling method, dual-channel drill pipe drilling has the characteristics of multiple flow channels and variable-temperature and variable-mass flow. None of the previous wellbore temperature models can be applied, and there are no relevant research reports. Due to the lack of a corresponding wellbore temperature prediction model and wellbore temperature control method, the application of this drilling technology in ultra-deep formation drilling is greatly restricted. Summary of the Invention

[0004] The present invention provides a temperature control drilling method, device, equipment and medium based on a dual-channel drill pipe to achieve temperature control under the dual-channel drill pipe drilling technology and realize temperature control drilling.

[0005] According to one aspect of the present invention, there is provided a temperature control drilling method based on a dual-channel drill pipe, including:

[0006] Obtaining a horizontal wellbore transient heat transfer model according to the circulation mode of the dual-channel drill pipe, where the circulation mode characterizes the flow direction of the fluid in the dual-channel drill pipe;

[0007] Obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model;

[0008] Performing temperature control drilling based on the wellbore temperature.

[0009] Optionally, the circulation mode includes:

[0010] Circulation mode A: The main circulation fluid in the drill pipe flows upward, the main circulation fluid in the inner pipe channel flows downward, and the auxiliary fluid in the annulus channel between the inner and outer pipes is stationary.

[0011] Circulation mode B: The main circulation fluid in the drill pipe flows upward, the main circulation fluid in the inner pipe channel flows downward, and the auxiliary fluid in the annulus channel between the inner and outer pipes flows downward.

[0012] Circulation mode C: The main circulation fluid in the drill pipe flows downward, the main circulation fluid in the inner pipe channel flows upward, and the auxiliary fluid in the annulus channel between the inner and outer pipes flows downward.

[0013] The horizontal wellbore transient heat transfer model includes: the transient heat transfer model in the drill pipe corresponding to each heat region of the double-channel drill pipe, the transient heat transfer model in the inner pipe channel, the transient heat transfer model in the annulus channel between the inner and outer pipes, and the transient heat transfer model at the double-pass valve.

[0014] Optionally, the transient heat transfer model in the drill pipe includes:

[0015]

[0016] Wherein:

[0017]

[0018]

[0019] Subscript 1 represents the fluid in the drill pipe, subscript pi-in represents the inner wall of the inner pipe of the double-channel drill pipe, subscript p-in is the inner pipe, d is the diameter, Q f1 is the axial heat convection term in the drill pipe, q is the displacement, q 1 is the displacement of the main circulation fluid pumped in, q 2 is the displacement of the auxiliary fluid pumped in.

[0020] Optionally, the transient heat transfer model in the inner pipe channel includes:

[0021]

[0022] Wherein:

[0023]

[0024]

[0025] The subscript 2 represents the fluid in the inner pipe channel, the subscript po-in represents the outer wall of the inner pipe of the dual-channel drill pipe, the subscript pi-out represents the inner wall of the outer pipe of the dual-channel drill pipe, the subscript p-out represents the outer pipe of the dual-channel drill pipe, and Q f2 is the axial heat convection term in the inner pipe channel.

[0026] Optionally, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe includes:

[0027]

[0028]

[0029] Optionally, the transient heat transfer model at the double-pass valve includes:

[0030]

[0031] Q A1 and Q A2 are respectively the heat source terms generated by viscous dissipation in the control volume units at the drill pipe center and at the double-pass valve in the inner pipe channel under the condition of circulation mode A;

[0032]

[0033] Q B1 and Q B2 are respectively the heat source terms generated by viscous dissipation in the control volume units at the drill pipe center and at the double-pass valve in the inner pipe channel under the condition of circulation mode B. v zB1 and v zB2 are respectively the flow velocities through the double-pass valve at the drill pipe center and in the inner pipe channel under the condition of circulation mode B.

[0034] Optionally, obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model includes:

[0035] Solving the partial differential equations of the transient heat transfer model in the drill pipe, the transient heat transfer model in the inner pipe channel, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe, and the transient heat transfer model at the double-pass valve using the finite difference method to obtain the wellbore temperature.

[0036] According to another aspect of the present invention, a temperature control drilling device based on a dual-channel drill pipe is provided, including:

[0037] A model determination unit for obtaining a horizontal wellbore transient heat transfer model according to the circulation mode of the dual-channel drill pipe, where the circulation mode characterizes the flow direction of the fluid in the dual-channel drill pipe;

[0038] A wellbore temperature determination unit for obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model;

[0039] A wellbore temperature processing unit for controlling temperature drilling based on the wellbore temperature.

[0040] According to another aspect of the present invention, there is provided an electronic device, which includes:

[0041] At least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the temperature control drilling method based on a dual-channel drill pipe according to any embodiment of the present invention.

[0042] According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the temperature control drilling method based on a dual-channel drill pipe according to any embodiment of the present invention when executed.

[0043] The technical solution of the embodiment of the present invention obtains a horizontal wellbore transient heat transfer model according to the circulation mode of the dual-channel drill pipe, where the circulation mode characterizes the flow direction of the fluid in the dual-channel drill pipe; obtains the wellbore temperature according to the horizontal wellbore transient heat transfer model; and conducts temperature control drilling based on the wellbore temperature. On the basis of ordinary drilling, the present invention analyzes the flow characteristics and heat transfer mechanism in each flow channel under each circulation mode, obtains a horizontal wellbore transient heat transfer model, sets initial and boundary conditions, uses the finite difference method to solve the model to obtain the wellbore temperature, and optimizes drilling parameters according to the wellbore temperature and the model to conduct temperature control drilling.

[0044] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0046] Figure 1 is a flowchart of a temperature control drilling method based on a dual-channel drill pipe provided in Embodiment 1 of the present invention;

[0047] Figure 2 is a schematic diagram of Circulation Mode A applicable to the embodiments of the present invention;

[0048] Figure 3 It is a schematic diagram of the loop mode B applicable to the embodiments of the present invention;

[0049] Figure 4 It is a schematic diagram of the loop mode C applicable to the embodiments of the present invention;

[0050] Figure 5 It is a schematic structural diagram of a temperature control drilling device based on a double-channel drill pipe provided in the second embodiment of the present invention;

[0051] Figure 6 It is a schematic structural diagram of an electronic device for implementing the temperature control drilling method based on a double-channel drill pipe according to the embodiments of the present invention. Detailed implementation manners

[0052] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0054] Embodiment 1

[0055] Figure 1 It is a flowchart of a temperature control drilling method based on a double-channel drill pipe provided in Embodiment 1 of the present invention. This embodiment is applicable to the situation of controlling the temperature of double-channel drill pipe drilling. This method can be executed by a temperature control drilling device based on a double-channel drill pipe. The temperature control drilling device based on a double-channel drill pipe can be implemented in the form of hardware and / or software, and the temperature control drilling device based on a double-channel drill pipe can be configured in an electronic device. As Figure 1 shown, this method includes:

[0056] S110. Obtain a horizontal wellbore transient heat transfer model according to the circulation mode of the double-channel drill pipe, where the circulation mode characterizes the flow direction of the fluid in the double-channel drill pipe.

[0057] In the embodiments of the present invention, the circulation mode includes:

[0058] Circulation mode A: The flow direction of the main circulating fluid in the drill pipe is upward, the flow direction of the main circulating fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is stationary.

[0059] Circulation mode B: The flow direction of the main circulating fluid in the drill pipe is upward, the flow direction of the main circulating fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward.

[0060] Circulation mode C: The flow direction of the main circulating fluid in the drill pipe is downward, the flow direction of the main circulating fluid in the inner pipe channel is upward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward.

[0061] During the drilling process, the fluid has the following several circulation modes: In conventional drill pipe drilling, the flow direction of the fluid in the drill pipe is downward, and the flow direction of the fluid in the annulus is upward. In double-channel drill pipe drilling, multiple flow channels can form a variety of different circulation modes: The first circulation mode is that the flow direction of the main circulating fluid in the drill pipe is upward, the flow direction of the main circulating fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is stationary (non-flowing) (circulation mode A), Figure 2 which is a schematic diagram of circulation mode A applicable to the embodiments of the present invention; The second circulation mode is that the flow direction of the main circulating fluid in the drill pipe is upward, the flow direction of the main circulating fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward (circulation mode B), Figure 3 which is a schematic diagram of circulation mode B applicable to the embodiments of the present invention; The third circulation mode is that the flow direction of the main circulating fluid in the drill pipe is downward, the flow direction of the main circulating fluid in the inner pipe channel is upward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward (circulation mode C), Figure 4 which is a schematic diagram of circulation mode C applicable to the embodiments of the present invention.

[0062] The heat transfer mechanism in each region of the wellbore is divided by the two-way valve. The heat transfer mechanism in each hot region below the two-way valve is exactly the same as that in conventional drilling, which will not be elaborated here; the fluid temperatures in the drill pipe and the inner pipe channel depend on the radial forced convection heat transfer rate and the axial heat convection rate; when the auxiliary fluid in the annulus between the inner pipe and the outer pipe does not flow, the fluid temperature mainly depends on the radial heat conduction between the fluid and the wellbore wall and the outer wall of the outer pipe and the axial heat conduction within the fluid. When the auxiliary fluid in the annulus between the inner pipe and the outer pipe flows downward, the fluid temperature of the auxiliary fluid depends on the radial forced convection heat transfer rate with the outer wall of the outer pipe and the wellbore wall, as well as the downward heat convection rate and the viscous dissipation heat generation rate within the fluid; at the two-way valve, according to the continuity of fluid flow, the temperatures of different flow channels in the control volume unit mainly depend on the heat convection rate along the flow direction and the viscous dissipation heat generation rate; on the drill pipe wall, the temperatures of the inner pipe wall and the outer pipe wall are mainly determined by the radial heat exchange rate of the fluid in contact with them, as well as the internal axial heat conduction rate.

[0063] S120. Obtain the wellbore temperature according to the horizontal wellbore transient heat transfer model.

[0064] In the embodiment of the present invention, the horizontal wellbore transient heat transfer model includes: the transient heat transfer model in the drill pipe corresponding to each hot region of the double-channel drill pipe, the transient heat transfer model in the inner pipe channel, the transient heat transfer model in the annulus between the inner pipe and the outer pipe, and the transient heat transfer model at the two-way valve.

[0065] In the embodiment of the present invention, the transient heat transfer model in the drill pipe includes:

[0066]

[0067] Wherein:

[0068]

[0069]

[0070] The subscript 1 represents the fluid in the drill pipe, the subscript pi-in represents the inner wall of the inner pipe of the double-channel drill pipe, the subscript p-in is the inner pipe, d is the diameter, Q f1 is the axial heat convection term in the drill pipe, q is the displacement, q 1 is the displacement of the main circulating fluid pumped in, q 2 is the displacement of the auxiliary fluid pumped in.

[0071] In the embodiment of the present invention, the transient heat transfer model in the inner pipe channel includes:

[0072]

[0073] Wherein:

[0074]

[0075]

[0076] The subscript 2 represents the fluid in the inner pipe channel, the subscript po-in represents the outer wall of the inner pipe of the double-channel drill pipe, the subscript pi-out represents the inner wall of the outer pipe of the double-channel drill pipe, the subscript p-out represents the outer pipe of the double-channel drill pipe, Q f2 is the axial heat convection term in the inner pipe channel.

[0077] In the embodiment of the present invention, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe includes:

[0078]

[0079]

[0080] In the embodiment of the present invention, the transient heat transfer model at the double-pass valve includes:

[0081]

[0082] Q A1 and Q A2 are respectively the heat source terms generated by viscous dissipation in the control volume units at the drill pipe center and at the double-pass valve in the inner pipe channel under the condition of circulation mode A;

[0083]

[0084] Q B1 and Q B2 are respectively the heat source terms generated by viscous dissipation in the control volume units at the drill pipe center and at the double-pass valve in the inner pipe channel under the condition of circulation mode B. v zB1 and v zB2 are respectively the flow velocities through the double-pass valve at the drill pipe center and in the inner pipe channel under the condition of circulation mode B.

[0085] The set conditions are as follows: Assume that before starting the circulating drilling, the wellbore temperature returns to the same as the surrounding ambient temperature. The original temperature of the surrounding environment is regarded as the initial condition of the whole system; at the bottom of the well, the fluid in the drill string enters the annulus through the bit nozzle. According to the continuity of fluid flow, the temperature in the drill string in the bottom hole area is considered to be equal to the annulus temperature, and is also considered to be equal to the temperature on the drill string wall at the bottom of the well; in the control volume unit of the double-pass valve, the temperature of the inner pipe wall of the double-channel drill pipe is considered to be the average value of the fluid temperatures in the drill pipe center and in the inner pipe channel; the temperature in the formation area far from the wellbore is considered to be the original formation temperature; the temperature on the formation surface is always considered to be the same as the atmospheric temperature.

[0086] S130. Conduct temperature-controlled drilling based on the wellbore temperature.

[0087] In the embodiments of the present invention, obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model includes:

[0088] Solving the partial differential equations of the transient heat transfer models in the drill pipe, the inner pipe channel, the annulus channel between the inner pipe and the outer pipe, and the transient heat transfer model at the double-pass valve using the finite difference method to obtain the wellbore temperature.

[0089] Solving the partial differential equations of the transient heat transfer in the above-mentioned respective heat regions using the finite difference method to solve for the wellbore temperature. The temperature equations in all control volume units in the wellbore-formation system can form a pentadiagonal linear equation system, and its matrix form can be expressed as:

[0090] AT n+1 = B;

[0091] To ensure safe and efficient drilling, it is necessary to reduce the wellbore temperature during the drilling process. Based on this principle, the parameters during the drilling process can be optimized. Since the conditions of wells in different regions and different well areas are different, a universal optimization scheme applicable to all wells cannot be given, but all can be optimized around the principle of reducing the wellbore temperature, such as adding heat insulation layers to the casing wall and the downhole drill pipe wall, optimizing the position of the double-pass valve, reducing the inlet temperature of the main and auxiliary circulating fluids, increasing the large annulus flow rate, reducing the thermal conductivity, increasing the specific heat, etc.

[0092] In dual-channel drill pipe drilling, there are three circulation modes of the fluid. Analyze the flow characteristics and heat transfer mechanisms in each flow channel under each circulation mode, obtain the horizontal wellbore transient heat transfer model, set the initial and boundary conditions, use the finite difference method to solve the model to obtain the wellbore temperature, and optimize the drilling parameters based on the wellbore temperature and the model to conduct temperature-controlled drilling. In addition, the horizontal wellbore transient heat transfer model can provide theoretical support for the wellbore temperature prediction of dual-channel drill pipe drilling and its application in ultra-deep well temperature-controlled drilling or high-efficiency development of geothermal wells.

[0093] In dual-channel drill pipe drilling, the fluid flow in the wellbore has the following three modes: In the first circulation mode, the main circulating fluid in the drill pipe flows upward, the main circulating fluid in the inner pipe channel flows downward, and there is an annulus channel between the inner pipe and the outer pipe, and the auxiliary fluid in this channel is stationary; In the second circulation mode, the main circulating fluid in the drill pipe flows upward, the main circulating fluid in the inner pipe channel flows downward, and the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe flows downward; In the third circulation mode, the main circulating fluid in the drill pipe flows downward, the main circulating fluid in the inner pipe channel flows upward, and the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe flows downward.

[0094] The heat transfer mechanism in each area within the wellbore is demarcated by a two-way valve. The heat transfer mechanism in each hot area below the two-way valve is exactly the same as that in conventional drilling, which will not be elaborated here; the fluid temperatures within the drill pipe and the inner pipe channel depend on the radial forced convection heat transfer rate and the axial heat convection rate; when the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe does not flow, the fluid temperature mainly depends on the radial heat conduction between the fluid and the wellbore wall and the outer wall of the outer pipe, as well as the axial heat conduction within the fluid. When the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe flows downward, the fluid temperature of the auxiliary fluid depends on the radial forced convection heat transfer rate with the outer wall of the outer pipe and the wellbore wall, as well as the downward heat convection rate and the viscous dissipation heat generation rate within the fluid; at the two-way valve, according to the continuity of fluid flow, the temperatures of different flow channels within this control volume unit mainly depend on the heat convection rate along the flow direction and the viscous dissipation heat generation rate; on the drill pipe wall, the temperatures of the inner pipe wall and the outer pipe wall are mainly determined by the radial heat exchange rate of the fluid in contact with them, as well as the internal axial heat conduction rate.

[0095] Make the following several assumptions: (1) The fluids in each flow channel within the wellbore flow axially, without considering the radial flow behavior and heat behavior within a single flow channel; (2) When fluids from multiple channels converge at the two-way valve, the temperature change is considered to occur instantaneously; (3) The axis direction of the horizontal wellbore is always considered as the axial direction, and the direction perpendicular to the wellbore axis is considered as the radial direction. Regarding the wellbore - formation in dual - channel drill pipe drilling as an integrated heat transfer system, an integrated transient heat transfer model can be established to reflect the heat behavior of each hot area within the wellbore in dual - channel drill pipe drilling. The specific transient heat transfer models for different areas are the same as the respective formulas in the previous text.

[0096] The finite - difference method is used to solve the transient heat transfer model to obtain the wellbore temperature. Based on the obtained integrated transient heat transfer model, with the aim of reducing the wellbore temperature during drilling, parameter optimization is carried out to achieve temperature - controlled drilling. Among them, the technical measures that can be used are: adding heat - insulating and heat - preserving layers at the casing wall and the downhole drill pipe wall without affecting the normal circulation drilling of the main circulating fluid; optimizing the position of the two - way valve; reducing the inlet temperature of the main and auxiliary circulating fluids and increasing the large annulus flow rate; reducing the thermal conductivity and increasing the specific heat, etc.

[0097] Through this temperature - controlled drilling technology, the temperature field change of the entire well during deep drilling can be accurately predicted, and the occurrence of accidents during deep drilling operations can be effectively prevented. By mastering the wellbore temperature, the wellbore pressure can be better controlled, more efficient downhole tools can be selected, which can further promote the development of deep - layer oil and gas resources and solve the problems such as wellbore pressure control and downhole tool selection faced in deep drilling.

[0098] The following elaborates on the solution of the present invention through a specific embodiment:

[0099] Description of the drilling method in the specific B circulation mode:

[0100] Based on the fluid being in the b circulation mode, the main circulation fluid flow direction in the drill pipe is upward, the main circulation fluid flow direction in the inner pipe channel is downward, and the auxiliary fluid flow direction in the annulus channel between the inner pipe and the outer pipe is downward. Using the finite difference method for the aforementioned formula, the wellbore temperature distribution can be obtained: Under the condition of circulation mode B, for the fluid flow in FC3, its temperature is the lowest among the three channels. At the same time, under the condition of circulation mode B, the temperature of the fluid injected downward in FC2 is relatively low, so the temperature of the fluid in FC3 under the condition of circulation mode B is also relatively low. In addition, the fluid in FC3 enters the upward-return fluid channel at the double-pass valve and undergoes thermal convection with the upward-return fluid. Therefore, the temperature of the upward-return fluid suddenly decreases at the double-pass valve under the condition of circulation mode B. Compared with conventional drilling, the other temperature distribution characteristics of the main circulation fluid in dual-channel drill pipe drilling are approximately the same. In addition, it is known from model calculations that the bottom hole temperature at the final steady state under different circulation mode conditions satisfies: Circulation mode B < Conventional drilling, while the outlet temperature satisfies: Circulation mode B > Conventional drilling. During ultra-high temperature formation drilling or geothermal well development, too high a bottom hole temperature can cause changes in the performance of drilling fluid, failure of downhole measurement tools, shortening of bit life, etc., posing great challenges to safe drilling. If there is a drilling method that can reduce the bottom hole temperature, it is very beneficial for ultra-high temperature formation drilling. Under this condition, if the returned wellhead temperature can be ensured to be relatively high, it can also meet the development of geothermal wells. Therefore, the circulation mode B of dual-channel drill pipe drilling provides a possibility for safe drilling in ultra-high temperature formations and efficient development of geothermal wells.

[0101] The bottom hole temperature under different circulation mode conditions gradually decreases with time, but there are significant differences in the decrease rate and decrease amount. Comparing the bottom hole temperatures of circulation mode B and conventional drilling, in the initial stage, the decrease rate of the former is less than that of the latter, but in the later stage, the decrease rate of the latter decreases rapidly with time, which results in the bottom hole temperature of the former being less than that of the latter finally. If the parameters can be optimized, the temperature difference between the two may be even greater. Therefore, the circulation mode B of dual-channel drill pipe drilling has obvious advantages in ultra-high temperature formation drilling. At this time, ways such as reducing the inlet temperature of the main and auxiliary circulation fluids and increasing the large annulus flow rate can all reduce the temperature during drilling.

[0102] Embodiment 2

[0103] Figure 5 It is a schematic structural diagram of a temperature control drilling device based on a dual-channel drill pipe provided by Embodiment 2 of the present invention. As Figure 5 shown, the device includes:

[0104] A model determination unit 510, configured to obtain a horizontal wellbore transient heat transfer model according to a circulation mode of a dual-channel drill pipe, where the circulation mode characterizes a flow direction of a fluid in the dual-channel drill pipe;

[0105] A wellbore temperature determination unit 520, configured to obtain a wellbore temperature according to the horizontal wellbore transient heat transfer model;

[0106] A wellbore temperature processing unit 530, configured to perform temperature-controlled drilling based on the wellbore temperature.

[0107] Optionally, the circulation mode includes:

[0108] Circulation mode A: The flow direction of the main circulation fluid in the drill pipe is upward, the flow direction of the main circulation fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is stationary;

[0109] Circulation mode B: The flow direction of the main circulation fluid in the drill pipe is upward, the flow direction of the main circulation fluid in the inner pipe channel is downward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward;

[0110] Circulation mode C: The flow direction of the main circulation fluid in the drill pipe is downward, the flow direction of the main circulation fluid in the inner pipe channel is upward, and the flow direction of the auxiliary fluid in the annulus channel between the inner pipe and the outer pipe is downward;

[0111] The horizontal wellbore transient heat transfer model includes: a transient heat transfer model in the drill pipe corresponding to each heat region of the dual-channel drill pipe, a transient heat transfer model in the inner pipe channel, a transient heat transfer model in the annulus channel between the inner pipe and the outer pipe, and a transient heat transfer model at a double-pass valve.

[0112] Optionally, the transient heat transfer model in the drill pipe includes:

[0113]

[0114] Wherein:

[0115]

[0116]

[0117] Subscript 1 represents the fluid in the drill pipe, subscript pi-in represents the inner wall of the inner pipe of the dual-channel drill pipe, subscript p-in is the inner pipe, d is the diameter, Q f1 is the axial heat convection term in the drill pipe, q is the displacement, q 1 is the displacement of the main circulation fluid pumped in, q 2 is the displacement of the auxiliary fluid pumped in.

[0118] Optionally, the transient heat transfer model in the inner pipe channel includes:

[0119]

[0120] Where:

[0121]

[0122]

[0123] The subscript 2 represents the fluid in the inner pipe channel, the subscript po-in represents the outer wall of the inner pipe of the double-channel drill pipe, the subscript pi-out represents the inner wall of the outer pipe of the double-channel drill pipe, the subscript p-out represents the outer pipe of the double-channel drill pipe, and Q f2 is the axial heat convection term in the inner pipe channel.

[0124] Optionally, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe includes:

[0125]

[0126]

[0127] Optionally, the transient heat transfer model at the double-pass valve includes:

[0128]

[0129] Q A1 and Q A2 are respectively the heat source terms generated by viscous dissipation in the control volume unit at the double-pass valve in the drill pipe and in the inner pipe channel under condition A of the circulation mode;

[0130]

[0131] Q B1 and Q B2 are respectively the heat source terms generated by viscous dissipation in the control volume unit at the double-pass valve in the drill pipe and in the inner pipe channel under condition B of the circulation mode. v zB1 and v zB2 are respectively the flow velocities through the double-pass valve in the drill pipe and in the inner pipe channel under condition B of the circulation mode.

[0132] Optionally, the wellbore temperature determination unit 520 is configured to perform:

[0133] Solving the partial differential equations of the transient heat transfer model in the drill pipe, the transient heat transfer model in the inner pipe channel, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe, and the transient heat transfer model at the double-pass valve by using the finite difference method to obtain the wellbore temperature.

[0134] The temperature control drilling device based on a dual-channel drill pipe provided by an embodiment of the present invention can execute the temperature control drilling method based on a dual-channel drill pipe provided by any embodiment of the present invention, and has function modules and beneficial effects corresponding to the execution of the method.

[0135] Embodiment III

[0136] Figure 6 FIG. shows a schematic structural diagram of an electronic device 10 that can be used to implement an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as, for example, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, for example, a personal digital processor, a cellular phone, a smart phone, a wearable device (such as a helmet, glasses, a watch, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0137] As Figure 6 shown, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0138] Multiple components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0139] The processor 11 may be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the temperature control drilling method based on a dual-channel drill pipe.

[0140] In some embodiments, the temperature control drilling method based on a dual-channel drill pipe may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the temperature control drilling method based on a dual-channel drill pipe described above may be executed. Alternatively, in other embodiments, the processor 11 may be configured to execute the temperature control drilling method based on a dual-channel drill pipe in any other suitable manner (e.g., by means of firmware).

[0141] Various embodiments of the systems and techniques described above in this document may be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGA), application-specific integrated circuits (ASIC), application-specific standard products (ASSP), systems-on-chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs that may be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor that receives data and instructions from a storage system, at least one input device, and at least one output device, and transmits the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0142] The computer program for implementing the method of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowchart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0143] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0144] In order to provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0145] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0146] A computing system may include a client and a server. The client and the server are generally far from each other and usually interact via a communication network. The client-server relationship is created by computer programs running on respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system, solving the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0147] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0148] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A temperature-controlled drilling method based on a dual-channel drill pipe, characterized in that: include: A horizontal wellbore transient heat transfer model is obtained according to a circulation pattern of a dual-channel drill pipe, wherein the circulation pattern represents a flow direction of a fluid in the dual-channel drill pipe; Obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model; Temperature-controlled drilling is performed based on the wellbore temperature.

2. The method according to claim 1, characterized in that The cycle mode includes: Circulation mode A: The main circulation fluid in the drill pipe flows upward, the main circulation fluid in the inner pipe channel flows downward, and the auxiliary fluid in the annular channel between the inner pipe and the outer pipe flows statically; Circulation mode B: the main circulation fluid in the drill pipe flows upward, the main circulation fluid in the inner pipe channel flows downward, and the auxiliary fluid in the annular channel between the inner pipe and the outer pipe flows downward; Circulation mode C: the main circulation fluid in the drill pipe flows downward, the main circulation fluid in the inner pipe channel flows upward, and the auxiliary fluid in the annular channel between the inner pipe and the outer pipe flows downward; The horizontal wellbore transient heat transfer model includes: a transient heat transfer model in the drill pipe corresponding to each hot area of ​​the dual-channel drill pipe, a transient heat transfer model in the inner pipe channel, a transient heat transfer model in the annular channel between the inner pipe and the outer pipe, and a transient heat transfer model at the two-way valve.

3. The method according to claim 2, characterized in that The transient heat transfer model in the drill pipe includes: in: Subscript 1 represents the fluid in the drill pipe, subscript pi-in represents the inner wall of the inner tube of the double-channel drill pipe, subscript p-in represents the inner tube, d represents the diameter, Q f1 is the axial heat convection term in the drill pipe, q is the displacement, q1 is the displacement of the main circulating fluid pumped in, and q2 is the displacement of the auxiliary fluid pumped in.

4. The method according to claim 2, characterized in that The transient heat transfer model in the inner tube channel includes: in: Subscript 2 represents the fluid in the inner tube channel, subscript po-in represents the outer wall of the inner tube of the dual-channel drill pipe, subscript pi-out represents the inner wall of the outer tube of the dual-channel drill pipe, subscript p-out represents the outer tube of the dual-channel drill pipe, Q f2 is the axial heat convection term in the inner tube channel.

5. The method according to claim 2, characterized in that The transient heat transfer model in the annular channel between the inner tube and the outer tube includes: In cycle mode A; 6. The method according to claim 2, characterized in that The transient heat transfer model at the two-way valve includes: In cycle mode A; Q A1 and Q A2 are the heat source terms generated by viscous dissipation in the control volume unit at the two-way valve in the drill pipe and the inner pipe channel under circulation mode A; In cycle mode B; Q B1 and Q B2 are the heat source items generated by viscous dissipation in the control volume unit at the two-way valve in the drill pipe and the inner pipe channel under circulation mode B. zB1 and v zB2 are the flow rates through the two-way valve in the drill pipe and the inner tube channel under circulation mode B, respectively.

7. The method according to claim 2, characterized in that The obtaining the wellbore temperature according to the horizontal wellbore transient heat transfer model comprises: The wellbore temperature is obtained by solving the partial differential equations of the transient heat transfer model in the drill pipe, the transient heat transfer model in the inner pipe channel, the transient heat transfer model in the annulus channel between the inner pipe and the outer pipe, and the transient heat transfer model at the two-way valve using the finite difference method.

8. A temperature-controlled drilling device based on a dual-channel drill pipe, characterized in that: include: A model determination unit, configured to obtain a transient heat transfer model of a horizontal wellbore according to a circulation mode of a dual-channel drill pipe, wherein the circulation mode represents a flow direction of a fluid in the dual-channel drill pipe; a wellbore temperature determination unit, configured to obtain the wellbore temperature according to the horizontal wellbore transient heat transfer model; A wellbore temperature processing unit is used to perform temperature-controlled drilling based on the wellbore temperature.

9. An electronic device, characterized in that: The electronic device comprises: At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the temperature-controlled drilling method based on a dual-channel drill pipe as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the temperature-controlled drilling method based on a dual-channel drill pipe as described in any one of claims 1-7 when executed.

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