A method of optimizing horizontal well drilling with a screw drill

Abstract

The application provides a screw drill optimal horizontal well drilling method and belongs to the technical field of drilling equipment. According to different drilling targets, different screw drill parameters are adopted, specifically including: for the drilling target reaching the highest mechanical drilling speed in composite drilling, the working pressure difference of the screw drill is increased, and the optimal power output of the screw is maintained; for the drilling target reaching the optimal natural stable inclination / inclination increasing / inclination decreasing trend in composite drilling, the optimal screw working pressure difference solution is searched from the actual drilling data, and then the working pressure difference matched with different drill bits and screw drills is controlled; for the drilling target reaching the optimal build-up rate in sliding drilling, the optimal working pressure difference is obtained by controlling the working pressure difference matched with different drill bits and screw drills under different target build-up rates. The application can finely control the optimal parameter control of the screw drill in the horizontal well drilling process for different geology and engineering targets, so that the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to an optimized horizontal well drilling method using a screw drill bit. Background Technology

[0002] Horizontal well development is the primary development method for unconventional oil and gas fields. A horizontal well is a special type of well where the maximum inclination angle reaches or approaches 90° (generally not less than 86°) and maintains a certain length of horizontal section within the target formation. Sometimes, for special needs, the inclination angle can exceed 90°, "tilting upwards." Horizontal well drilling technology using screw drills is the main technology for efficient and low-cost development of horizontal wells.

[0003] A screw drill bit is an energy conversion device that converts the pressure energy of a liquid into mechanical energy. When high-pressure liquid enters the drill bit, it forces the rotor to roll within the stator. The torque and speed generated by the motor are transmitted to the drive shaft and drill bit via a universal joint, achieving the drilling purpose. As a downhole power drilling tool, the screw drill bit has the following outstanding advantages:

[0004] 1. Power is provided directly from the bottom of the well, reducing wear and damage to the drill pipe and casing.

[0005] 2. Increasing the drill bit's rotational speed and torque improves the drilling rate and mechanical drilling speed.

[0006] 3. It can accurately orient, tilt, and correct deviations.

[0007] 4. It can be used for horizontal well drilling, sidetracking, reaming, coring and other operations, significantly improving the economic benefits of drilling.

[0008] 5. When used in conjunction with a rotary table for full vertical well drilling, it significantly increases the mechanical drilling rate.

[0009] The screw drill string consists of five main parts: drive shaft assembly, universal joint assembly, motor assembly, anti-drop assembly, and bypass valve assembly. It is lowered into the well after a specific bend is set on the ground, enabling both composite drilling and sliding drilling in horizontal wells. Currently, the parameter optimization strategies for screw drill strings in horizontal well sections remain at the basic level of meeting directional well requirements, failing to adapt to different drilling objectives. Therefore, there is an urgent need to research how to determine the optimal parameters of different specifications of screw drill strings for different drilling objectives and to develop a refined operational decision tree process. Summary of the Invention

[0010] To address the problems existing in the prior art, this invention provides an optimized horizontal well drilling method using screw drills. Based on different drilling objectives, different screw drill parameters are employed. Specifically, for drilling objectives aiming to achieve the highest mechanical rate of penetration during composite drilling, the working pressure differential of the screw drill is increased while maintaining the optimal power output of the screw. For drilling objectives aiming to achieve the optimal natural stabilization / increase / decrease trend during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data, and then the working pressure differential matched with different drill bits and screw drills is controlled. For drilling objectives aiming to achieve the optimal build-up rate during sliding drilling, the optimal working pressure differential is obtained by controlling the working pressure differential matched with different drill bits and screw drills under different target build-up rates. This invention can precisely control the optimal parameters of the screw drill during horizontal well drilling for different geological and engineering objectives, thereby improving efficiency.

[0011] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0012] For composite drilling to achieve the highest mechanical drilling rate, the theoretical solution of the working pressure difference at the maximum screw output needs to be obtained based on the screw drill performance curve. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference to maintain the optimal power output of the screw is obtained. The drilling target of achieving the highest mechanical drilling rate in composite drilling refers to the well section in which composite drilling is carried out with the primary goal of improving the mechanical drilling rate when no directional drilling is required in the horizontal section of the horizontal well.

[0013] For drilling objectives involving composite drilling to achieve optimal natural inclination stabilization / inclination increase / declination trends, the optimal screw drilling pressure differential solution is searched from actual drilling data. This allows for the matching of different screw drilling pressure differentials with different objectives for different drill string combinations. Achieving optimal natural inclination stabilization / inclination increase / declination trends during composite drilling refers to well sections where directional control of the well inclination is required during the build-up and horizontal sections of a horizontal well. In this case, controlling the well inclination is the primary objective. Since different drill string combinations achieve different optimal natural inclination stabilization / inclination increase / declination trends through composite drilling, there is no theoretical solution. Therefore, the optimal screw drilling pressure differential solution is searched from actual drilling data, allowing for precise control of the screw drilling pressure differential with different objectives for different drill string combinations.

[0014] For sliding drilling operations aiming to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling. This allows for the determination of the appropriate working pressure differential for different drill bits and screw drilling tools under different target build-up rates. A drilling target aiming to achieve a target build-up rate during sliding drilling refers to the section of the well that creates the well inclination during the sliding drilling of the inclination section of a horizontal well.

[0015] Preferably, for drilling targets that achieve the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined using the following method:

[0016] The output power W of the screw drill is defined by the following formula:

[0017] W=Torque×RPM=Torque(DiffP)×RPM(DiffP)

[0018] in,

[0019] Torque is the output torque of the screw drill bit;

[0020] DiffP is the screw operating pressure difference;

[0021] RPM is the screw output speed;

[0022] Torque(DiffP) indicates that the output torque of the screw drill bit is a linear function of the screw working pressure difference;

[0023] RPM(DiffP) indicates that the output rotational speed of the screw drill bit is a cubic function of the screw working pressure difference;

[0024] when

[0025]

[0026] When the output power W reaches a local maximum, the resulting DiffP is... max For the corresponding maximum screw output power W max The optimal working pressure difference at that time.

[0027] Preferably, for drilling targets that achieve the highest mechanical drilling speed during composite drilling, the fatigue life constraint of the stator rubber of the screw drill bit is specifically as follows:

[0028] DiffP <s*DiffP rate

[0029] in,

[0030] s is the safety factor;

[0031] DiffP is the screw working pressure difference;

[0032] DiffP rate This is the maximum working pressure difference of the screw under the constraint of the stator rubber of the screw drill bit.

[0033] Preferably, the optimal solution DiffP for the screw working pressure difference under the constraint of stator rubber fatigue life is obtained. opt Determined by the following formula:

[0034] DiffP opt =min{s*DiffP rate DiffP max}

[0035] Preferably, for drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data, and then different screw drilling tool working pressure differentials are matched to different objectives for different drill tool combinations, specifically including:

[0036] Traverse the sliding and composite drilling data of the drilled well sections and mark the well sections where there is no sliding drilling between two adjacent measurement points;

[0037] Calculate the average working pressure difference of the screw drill string between the identified well sections;

[0038] Calculate the build-up rate and azimuth deflection rate between the identified well sections;

[0039] Determine the working pressure differential range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0040] Preferably, unsupervised learning methods are used to perform cluster analysis and statistical analysis on the average working pressure difference, build-up rate, and azimuth deflection rate based on the real-time calculation results of actual drilling data. This determines the classification relationship between the screw working pressure difference and the build-up rate and azimuth deflection rate, and identifies the optimal working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0041] Preferably, the average working pressure difference, build-up rate, and azimuth deflection rate are plotted into a stabilization trend diagram. In the stabilization trend diagram, the screw working pressure difference at different stabilization points is obtained by calculating the difference between the build-up rate and azimuth deflection rate between any two measurement points, thereby determining the range of screw working pressure difference corresponding to the target natural increase / stabilization / decrease in inclination.

[0042] Preferably, for drilling targets requiring a target build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling. This determines the matching working pressure differential for different drill bits and screw drilling tools under different target build-up rates, specifically including:

[0043] First, the drilling rig status is automatically determined through real-time data, identifying the sliding drilling section and time interval;

[0044] Then, by covering the two inclination measurement records of the sliding well section, the actual inclination rate of the sliding well section and the screw inclination rate during the sliding drilling process are calculated.

[0045] Calculate the screw working pressure difference during the sliding drilling process in the corresponding well section;

[0046] Based on the actual build-up rate of the well section and the corresponding screw working pressure difference, determine the actual build-up capacity range and corresponding screw working pressure difference of different drill bit and screw drill tool combinations for different formations, thereby achieving precise working pressure difference control by matching different drill bits and screw drill tools for different target build-up rates.

[0047] Compared with the prior art, the present invention has at least the following beneficial effects:

[0048] (1) This invention uses real-time analysis of comprehensive logging data to form a complete decision tree, thereby realizing the optimal parameter control strategy for horizontal well screw drill bit drilling. This realizes the transformation of the screw drill bit parameter optimization strategy from basically meeting the directional requirements (i.e., screw parameter control based on field drilling experience) to forming a real-time analysis and fine management operation decision tree process. In other words, it can finely control the optimal parameter control of the screw drill bit under different objectives during horizontal well drilling, thereby improving drilling efficiency. It can be used as the basis for pre-drilling scheme design and as a real-time parameter optimization method in the actual drilling process of drilling engineering. It can be applied on a large scale to all drilling operations. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the output performance of a screw drill bit;

[0050] Figure 2 This is a graph showing the relationship between the working pressure difference, output drilling speed, and output torque of a screw drill bit in real-time operation according to an embodiment of the present invention.

[0051] Figure 3 This is a schematic diagram illustrating the relationship between the output power and working pressure difference of a screw drill bit according to an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram illustrating the skewing trend of a screw drill bit according to an embodiment of the present invention;

[0053] Figure 5 This is a real-time monitoring process for screw drills according to an embodiment of the present invention;

[0054] Figure 6 This is a composite drilling stabilization trend diagram according to an embodiment of the present invention;

[0055] Figure 7 This is a real-time calculation interface for a horizontal section of a well during combined drilling and sliding drilling using a screw drill bit, as described in one embodiment of the present invention. It is used to display the information that the real-time calculation interface can display, and unclear words do not affect the understanding of the technical solution.

[0056] Figure 8 This is a flowchart of a method for optimizing horizontal well drilling using a screw drill bit, according to an embodiment of the present invention.

[0057] Figure 4-7This is merely a schematic diagram showing the various calculation data that can be displayed in the software interface for implementing the optimal horizontal well drilling method using screw drills. Unclear text does not affect the understanding of the technical solution. Detailed Implementation

[0058] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0059] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0060] For composite drilling to achieve the highest mechanical drilling rate, the theoretical solution of the working pressure difference at the maximum screw output needs to be obtained based on the screw drill performance curve. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference to maintain the optimal power output of the screw is obtained. The drilling target of achieving the highest mechanical drilling rate in composite drilling refers to the well section in which composite drilling is carried out with the primary goal of improving the mechanical drilling rate when no directional drilling is required in the horizontal section of the horizontal well.

[0061] For drilling objectives involving composite drilling, achieving optimal natural inclination stabilization / inclination increase / declination trends involves searching for the optimal screw drilling pressure differential solution from actual drilling data, and then matching different screw drilling tool working pressure differentials to different objectives for different drill string combinations. Achieving optimal natural inclination stabilization / inclination increase / declination trends in composite drilling refers to well sections where directional control of the well inclination is required during the horizontal well build-up and horizontal section composite drilling operations; in this case, controlling the well inclination is the primary objective. For achieving optimal natural inclination stabilization / inclination increase / declination trends in composite drilling...

[0062] The drilling target of inclination / decline trend has no theoretical solution because different drill bit combinations achieve different optimal natural inclination stabilization / increase / decrease trends through composite drilling. Therefore, the optimal screw working pressure difference solution is searched from actual drilling data, and then the screw drilling tool working pressure difference is precisely controlled to match different targets for different drill bit combinations.

[0063] For sliding drilling operations aiming to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling. This allows for the determination of the appropriate working pressure differential for different drill bits and screw drilling tools under different target build-up rates. A drilling target aiming to achieve a target build-up rate during sliding drilling refers to the section of the well that creates the well inclination during the sliding drilling of the inclination section of a horizontal well.

[0064] According to a specific embodiment of the present invention, for the drilling target of achieving the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined by the following method:

[0065] The output power W of the screw drill is defined by the following formula:

[0066] W=Torque×RPM=Torque(DiffP)×RPM(DiffP)

[0067] in,

[0068] Torque is the output torque of the screw drill bit;

[0069] DiffP is the screw operating pressure difference;

[0070] RPM is the screw output speed;

[0071] Torque(DiffP) indicates that the output torque of the screw drill bit is a linear function of the screw working pressure difference;

[0072] RPM(DiffP) indicates that the output rotational speed of the screw drill bit is a cubic function of the screw working pressure difference;

[0073] when

[0074]

[0075] When the output power W reaches a local maximum, the resulting DiffP is... max For the corresponding maximum screw output power W max The optimal working pressure difference at that time.

[0076] According to a specific embodiment of the present invention, for the drilling target of achieving the highest mechanical drilling speed during composite drilling, the fatigue life constraint of the stator rubber of the screw drill bit is specifically as follows:

[0077] DiffP <s*DiffP rate

[0078] in,

[0079] s is the safety factor;

[0080] DiffP is the screw working pressure difference;

[0081] DiffP rate This is the maximum working pressure difference of the screw under the constraint of the stator rubber of the screw drill bit.

[0082] According to a specific embodiment of the present invention, the optimal solution DiffP of the screw working pressure difference under the constraint of stator rubber fatigue life is obtained. opt Determined by the following formula:

[0083] DiffP opt =min{s*DiffP rate DiffP max}

[0084] According to a specific embodiment of the present invention, for drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data, and then different screw drilling tool working pressure differentials are matched to different objectives for different drill bit combinations, specifically including:

[0085] Traverse the sliding and composite drilling data of the drilled well sections and mark the well sections where there is no sliding drilling between two adjacent measurement points;

[0086] Calculate the average working pressure difference of the screw drill string between the identified well sections;

[0087] Calculate the build-up rate and azimuth deflection rate between the identified well sections;

[0088] Determine the working pressure differential range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0089] According to a specific embodiment of the present invention, the real-time calculation results of actual drilling data are subjected to cluster analysis and statistical analysis on the average working pressure difference, build-up rate and azimuth deflection rate using an unsupervised learning method. The classification relationship between the screw working pressure difference and the build-up rate and azimuth deflection rate is determined, and the working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease is determined.

[0090] According to a specific embodiment of the present invention, the average working pressure difference, build-up rate, and azimuth deflection rate are plotted into a stabilization trend diagram. In the stabilization trend diagram, the screw working pressure difference at different stabilization points is obtained by calculating the difference between the build-up rate and azimuth deflection rate between any two measurement points, thereby determining the screw drill bit working pressure difference range corresponding to the target natural increase / stabilization / decrease in inclination.

[0091] According to a specific embodiment of the present invention, for drilling targets requiring a target build-up rate during sliding drilling, the actual build-up rate of the well section, the screw build-up rate, and the screw working pressure differential are calculated using inclination measurement data during actual sliding drilling. This allows for the determination of different working pressure differentials matching the drill bit and screw drilling tool under different target build-up rates. Specifically, this includes:

[0092] First, the drilling rig status is automatically determined through real-time data, identifying the sliding drilling section and time interval;

[0093] Then, by covering the two inclination measurement records of the sliding well section, the actual inclination rate of the sliding well section and the screw inclination rate during the sliding drilling process are calculated.

[0094] Calculate the screw working pressure difference during the sliding drilling process in the corresponding well section;

[0095] Based on the actual build-up rate of the well section and the corresponding screw working pressure difference, determine the actual build-up capacity range and corresponding screw working pressure difference of different drill bit and screw drill tool combinations for different formations, thereby achieving precise working pressure difference control by matching different drill bits and screw drill tools for different target build-up rates.

[0096] Example 1

[0097] According to a specific embodiment of the present invention, the optimized horizontal well drilling method of the screw drill tool of the present invention will be described in detail below.

[0098] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0099] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0100] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0101] For sliding drilling to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure differentials that match different drill bits and screw drilling tools under different target build-up rates.

[0102] Example 2

[0103] According to a specific embodiment of the present invention, the optimized horizontal well drilling method of the screw drill tool of the present invention will be described in detail below.

[0104] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0105] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0106] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0107] For sliding drilling to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure differentials that match different drill bits and screw drilling tools under different target build-up rates.

[0108] For drilling targets that achieve the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined using the following method:

[0109] The output power W of the screw drill is defined by the following formula:

[0110] W=Torque×RPM=Torque(DiffP)×RPM(DiffP)

[0111] in,

[0112] Torque is the output torque of the screw drill bit;

[0113] DiffP is the screw operating pressure difference;

[0114] RPM is the screw output speed;

[0115] Torque(DiffP) indicates that the output torque of the screw drill bit is a linear function of the screw working pressure difference;

[0116] RPM(DiffP) indicates that the output rotational speed of the screw drill bit is a cubic function of the screw working pressure difference;

[0117] when

[0118]

[0119] When the output power W reaches a local maximum, the resulting DiffP is... max For the corresponding maximum screw output power W max The optimal working pressure difference at that time.

[0120] Example 3

[0121] According to a specific embodiment of the present invention, the optimized horizontal well drilling method of the screw drill tool of the present invention will be described in detail below.

[0122] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0123] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0124] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0125] For sliding drilling to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure differentials that match different drill bits and screw drilling tools under different target build-up rates.

[0126] For drilling targets that achieve the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined using the following method:

[0127] like Figure 2 As shown, according to the performance curve of the screw drill bit ( Figure 1 The output power W of the screw drill bit is defined using the following formula:

[0128] W=Torque×RPM=Torque(DiffP)×RPM(DiffP)

[0129] in,

[0130] Torque is the output torque of the screw drill bit;

[0131] DiffP is the screw operating pressure difference;

[0132] RPM is the screw output speed;

[0133] Torque(DiffP) indicates that the output torque of the screw drill bit is a linear function of the screw working pressure difference;

[0134] RPM(DiffP) indicates that the output rotational speed of the screw drill bit is a cubic function of the screw working pressure difference;

[0135] according to Figure 1 As shown, Torque and DiffP have a linear relationship; RPM and DiffP can be approximated as a decreasing cubic function. The relationship curve of W versus DiffP is plotted as follows: Figure 3 .

[0136] According to the solution of optimization theory, when

[0137]

[0138] When the output power W reaches a local maximum, the resulting DiffP is... max For the corresponding maximum screw output power W max The optimal working pressure difference at that time.

[0139] Specifically, for drilling targets that achieve the highest mechanical drilling speed during composite drilling, the fatigue life constraint of the stator rubber of the screw drill bit is as follows:

[0140] DiffP <s*DiffP rate

[0141] in,

[0142] s is the safety factor;

[0143] DiffP is the screw working pressure difference;

[0144] DiffP rate This is the maximum working pressure difference of the screw under the constraint of the stator rubber of the screw drill bit.

[0145] according to Figure 3 It can be seen that W is a concave function of DiffP. The optimal solution of DiffP for the screw working pressure difference under the constraint of stator rubber fatigue life is obtained. opt Determined by the following formula:

[0146] DiffP opt =min{s*DiffP rate DiffP max}

[0147] Example 4

[0148] According to a specific embodiment of the present invention, the optimized horizontal well drilling method of the screw drill tool of the present invention will be described in detail below.

[0149] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0150] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0151] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0152] For drilling targets that require achieving a target build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure difference of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure difference matching different drill bits and screw drilling tools under different target build-up rates.

[0153] Specifically, for drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data. Then, different screw drilling tool working pressure differentials are matched to different objectives for different drill bit combinations. This includes:

[0154] Traverse the sliding and composite drilling data of the drilled well sections and mark the well sections where there is no sliding drilling between two adjacent measurement points;

[0155] Calculate the average working pressure difference of the screw drill string between the identified well sections;

[0156] Calculate the build-up rate and azimuth deflection rate between the identified well sections; the results are as follows: Figure 4 As shown.

[0157] Determine the working pressure differential range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0158] Among them, the real-time calculation results of actual drilling data are used to perform cluster analysis and statistical analysis on the average working pressure difference, build-up rate and azimuth deflection rate, to determine the classification relationship between the screw working pressure difference and the build-up rate and azimuth deflection rate, and to determine the working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0159] The average working pressure difference, build-up rate, and azimuth deflection rate are plotted into a stabilization trend diagram. In the stabilization trend diagram, the screw working pressure difference at different stabilization points is obtained by calculating the difference between the build-up rate and azimuth deflection rate between any two measurement points, thereby determining the range of screw working pressure difference corresponding to the target natural increase / stabilization / decrease in inclination.

[0160] Example 5

[0161] According to a specific embodiment of the present invention, the optimized horizontal well drilling method of the screw drill tool of the present invention will be described in detail below.

[0162] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0163] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0164] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0165] For sliding drilling to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure differentials that match different drill bits and screw drilling tools under different target build-up rates.

[0166] Figure 5 The pointer on the upper right side displays the real-time working pressure differential of the screw drill bit during the drilling process of a specific well. Based on the manufacturer's tool specifications and comprehensive logging data, it calculates the real-time output torque and rotational speed, as well as the real-time output power, according to the power curve. The real-time output power is then compared with the theoretically optimal power. If the comparison result is above 80%, the screw drill bit is considered to be in the optimal power output range; if the comparison result is between 50% and 80%, it is considered to be in the suboptimal power output range; and if the comparison result is below 50%, it is considered to be in the poor power output range.

[0167] Figure 5 The pointer on the upper right displays the ratio of the real-time working differential pressure of the screw drill bit to its maximum recommended working differential pressure. When this ratio is below 60%, the screw is considered to have no risk of stalling; when the ratio is between 60% and 70%, the screw is considered to have a moderate risk of stalling; and when the ratio is below 80%, the screw is considered to have a high risk of stalling.

[0168] Based on the above two pointers, during real-time drilling, the screw is in its optimal output state when both pointers are near the critical values ​​of the two regions between 60% and 70% and below 60%.

[0169] For drilling targets requiring a specific build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling. This determines the matching working pressure differentials for different drill bits and screw drilling tools under different target build-up rates. Specifically, this includes:

[0170] First, the drilling rig status is automatically determined through real-time data, identifying the sliding drilling section and time interval;

[0171] Then, by covering the two inclination measurement records of the sliding well section, the actual inclination rate of the sliding well section and the screw inclination rate during the sliding drilling process are calculated.

[0172] Calculate the screw working pressure difference during the sliding drilling process in the corresponding well section;

[0173] Based on the actual build-up rate of the well section and the corresponding screw working pressure difference, determine the actual build-up capacity range and corresponding screw working pressure difference of different drill bit and screw drill tool combinations for different formations, thereby achieving precise working pressure difference control by matching different drill bits and screw drill tools for different target build-up rates.

[0174] Example 6

[0175] According to a specific embodiment of the present invention, taking a horizontal well as an example, the optimized horizontal well drilling method of the present invention using screw drill bit will be described in detail below.

[0176] This invention provides an optimized horizontal well drilling method using a screw drill bit, employing different screw drill bit parameters according to different drilling objectives, specifically including:

[0177] For composite drilling that aims to achieve the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference that maintains the optimal power output of the screw can be obtained.

[0178] For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different objectives for different drill tool combinations.

[0179] For sliding drilling to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure differentials that match different drill bits and screw drilling tools under different target build-up rates.

[0180] For drilling targets that achieve the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined using the following method:

[0181] The output power W of the screw drill is defined by the following formula:

[0182] W=Torque×RPM=Torque(DiffP)×RPM(DiffP)

[0183] in,

[0184] Torque is the output torque of the screw drill bit;

[0185] DiffP is the screw operating pressure difference;

[0186] RPM is the screw output speed;

[0187] Torque(DiffP) indicates that the output torque of the screw drill bit is a linear function of the screw working pressure difference;

[0188] RPM(DiffP) indicates that the output rotational speed of the screw drill bit is a cubic function of the screw working pressure difference;

[0189] when

[0190]

[0191] When the output power W reaches a local maximum, the resulting DiffP is... max For the corresponding maximum screw output power W max The optimal working pressure difference at that time.

[0192] Specifically, for drilling targets that achieve the highest mechanical drilling speed during composite drilling, the fatigue life constraint of the stator rubber of the screw drill bit is as follows:

[0193] DiffP <s*DiffP rate

[0194] in,

[0195] s is the safety factor;

[0196] DiffP is the screw working pressure difference;

[0197] DiffP rate This is the maximum working pressure difference of the screw under the constraint of the stator rubber of the screw drill bit.

[0198] The optimal solution of the screw working pressure difference DiffP under the constraint of stator rubber fatigue life. opt Determined by the following formula:

[0199] DiffP opt =min{s*DiffP rate DiffP max}

[0200] For drilling targets that require achieving a target build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure difference of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure difference matching different drill bits and screw drilling tools under different target build-up rates.

[0201] Specifically, for drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data. Then, different screw drilling tool working pressure differentials are matched to different objectives for different drill bit combinations. This includes:

[0202] Traverse the sliding and composite drilling data of the drilled well sections and mark the well sections where there is no sliding drilling between two adjacent measurement points;

[0203] Calculate the average working pressure difference of the screw drill string between the identified well sections;

[0204] Calculate the build-up rate and azimuth deflection rate between the identified well sections;

[0205] Determine the working pressure differential range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0206] Among them, the real-time calculation results of actual drilling data are used to perform cluster analysis and statistical analysis on the average working pressure difference, build-up rate and azimuth deflection rate, to determine the classification relationship between the screw working pressure difference and the build-up rate and azimuth deflection rate, and to determine the working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

[0207] The average working pressure difference, build-up rate, and azimuth deflection rate are plotted into a stabilization trend diagram. In the stabilization trend diagram, the screw working pressure difference at different stabilization points is obtained by calculating the difference between the build-up rate and azimuth deflection rate between any two measurement points, thereby determining the range of screw working pressure difference corresponding to the target natural increase / stabilization / decrease in inclination. Figure 6 This chart illustrates the stabilization trend during composite drilling. The horizontal axis represents the azimuth deflection rate between two measurement points, and the vertical axis represents the build-up rate between the two measurement points. Each scatter point on the chart represents a measured data point between two measurement points. The color on the right represents the average working pressure difference during the composite drilling process between the corresponding two measurement points.

[0208] For drilling targets requiring a specific build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling (as shown in Table 1). This determines the matching working pressure differentials for different drill bits and screw drilling tools under different target build-up rates. Specifically, this includes:

[0209] First, the drilling rig status is automatically determined through real-time data, identifying the sliding drilling section and time interval;

[0210] Then, by covering the two inclination measurement records of the sliding well section, the actual inclination rate of the sliding well section and the screw inclination rate during the sliding drilling process are calculated.

[0211] Calculate the screw working pressure difference during the sliding drilling process in the corresponding well section;

[0212] Based on the actual build-up rate of the well section and the corresponding screw working pressure difference, determine the actual build-up capacity range and corresponding screw working pressure difference of different drill bit and screw drill tool combinations for different formations, thereby achieving precise working pressure difference control by matching different drill bits and screw drill tools for different target build-up rates.

[0213] Table 1. Examples of Inclinometer Data During Actual Sliding Drilling

[0214]

[0215] Figure 7 The top right corner image first automatically determines the drilling rig status using real-time data, identifying the sliding drilling section from 5169.54m to 5173.14m. Then, by overwriting two survey records covering this sliding section, it calculates the actual build-up rate of -1.2° and the screw build-up rate of 3.7° / 30m during the sliding drilling process, thus calculating the average screw working pressure difference during this sliding process. The bottom right corner image shows the stabilization trend during composite drilling in this section, displaying data from 15 survey points. By calculating the difference in build-up rate and azimuth deflection between two survey points, the screw working pressure difference at different stabilization points is obtained. The second point in the third row indicates a build-up rate of -0.3° / 30m, an azimuth deflection rate of 0.3° / 30m, and a screw working pressure difference of 2.4 MPa, thus determining the screw drill bit working pressure difference range corresponding to the target natural increase / stabilization / decrease in inclination.

[0216] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An optimized horizontal well drilling method using a screw drill bit, characterized in that, Depending on the different engineering objectives during drilling, different screw drill parameters are used, specifically including: For composite drilling that requires achieving the highest mechanical drilling speed, it is necessary to obtain the theoretical solution of the working pressure difference at the maximum output of the screw drill bit based on the performance curve of the screw drill bit. At the same time, considering the fatigue constraint of the screw stator rubber, the optimal working pressure difference for maintaining the optimal power output of the screw can be obtained. For drilling objectives that achieve the optimal natural stabilization / increase / decrease trend during composite drilling, the optimal screw working pressure difference solution is searched from actual drilling data, and then different screw drilling tool working pressure differences are matched to different drilling tool combinations for different objectives. For drilling targets that require achieving a target build-up rate during sliding drilling, the actual build-up rate, screw build-up rate, and screw working pressure difference of the well section are calculated using the inclination measurement data during actual sliding drilling. This allows for the determination of the working pressure difference that matches different drill bits and screw drilling tools under different target build-up rates. For drilling targets that achieve the highest mechanical drilling speed during composite drilling, the corresponding screw drill string parameters are determined using the following method: The output power of the screw drill is defined by the following formula W : in, Torque is the output torque of the screw drill; DiffP is the screw working pressure difference; RPM is the screw output rotation speed; Torque ( DiffP ) indicates that the output torque of the screw drill is a linear function of the working pressure difference of the screw RPM DiffP ) indicates that the output rotational speed of the screw drill is a monomial cubic function of the screw working pressure difference;​ when at the time of maximum output power W The local maximum is obtained at this time DiffP max The optimal working pressure difference at the time of maximum screw output power W max at the time of maximum output power 2. The screw-in-drill- string optimized horizontal well drilling method of claim 1, wherein, For drilling objectives that aim to achieve the highest mechanical drilling rate during composite drilling, the fatigue life constraint of the stator rubber of the screw drill bit is specifically as follows: DiffP < s * DiffP rate in, s Safety factor; DiffP Screw working pressure difference; DiffP rate To determine the maximum screw working pressure difference under the constraint of the screw drill stator rubber.

3. The screw-in-drill-strings method of optimizing horizontal well drilling according to claim 2, characterized in that, Optimal solution of working pressure difference of screw under constraint condition of fatigue life of rubber of stator DiffP DiffP opt is determined by the following equation:​ DiffP opt = min{s DiffP rate , DiffP max}.

4. The screw-injector drill-stem optimization horizontal well drilling method of claim 1, wherein, For drilling objectives that achieve optimal natural stabilization / increase / decrease trends during composite drilling, the optimal screw working pressure differential solution is searched from actual drilling data. Then, different screw working pressure differentials are matched to different drill string combinations to achieve different objectives, specifically including: Traverse the sliding and composite drilling data of the drilled well sections and mark the well sections where there is no sliding drilling between two adjacent measurement points; Calculate the average working pressure difference of the screw drill string between the identified well sections; Calculate the build-up rate and azimuth deflection rate between the identified well sections; Determine the working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease inclination.

5. The screw-injector drill-stem optimization horizontal well drilling method of claim 4, wherein, The real-time calculation results of actual drilling data are used to perform cluster analysis and statistical analysis on the average working pressure difference, build-up rate and azimuth deflection rate. The classification relationship between the screw working pressure difference and the build-up rate and azimuth deflection rate is determined, and the working pressure difference range of the screw drill corresponding to the optimal natural increase / stabilization / decrease is determined.

6. The screw-injector drill-stem optimization horizontal well drilling method of claim 5, wherein, The average working pressure difference, build-up rate, and azimuth deflection rate are plotted into a stabilization trend diagram. In the stabilization trend diagram, the screw working pressure difference at different stabilization points is obtained by calculating the difference between the build-up rate and azimuth deflection rate between any two measurement points, thereby determining the range of screw working pressure difference corresponding to the target natural increase / stabilization / decrease in inclination.

7. The screw-in-drill- string method of optimizing horizontal well drilling of claim 1 wherein, For sliding drilling operations aiming to achieve a target build-up rate, the actual build-up rate, screw build-up rate, and screw working pressure differential are calculated using inclination measurement data from actual sliding drilling. This determines the matching working pressure differentials for different drill bits and screw drilling tools under different target build-up rates. Specifically, this includes: First, the drilling rig status is automatically determined through real-time data, identifying the sliding drilling section and time interval; Then, by overwriting the two inclination measurement records of the sliding drilling section, the actual build-up rate of the sliding drilling section and the screw build-up rate during the sliding drilling process are calculated. Calculate the screw working pressure difference during the sliding drilling process in the corresponding well section; Based on the actual build-up rate of the well section and the corresponding screw working pressure difference, determine the actual build-up capacity range and corresponding screw working pressure difference of different drill bit and screw drill tool combinations for different formations, thereby achieving precise working pressure difference control by matching different drill bits and screw drill tools for different target build-up rates.

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