A three-probe azimuthal gamma processing method and system

Abstract

The application discloses a three-probe azimuth gamma processing method and system. First, the working state of the drill collar is acquired, and the working state includes a composite drilling state and a sliding drilling state; the working state of a gamma sensor on the sidewall of the drill collar and the corresponding partition are set, API values of each gamma sensor in each partition around the drill collar in a running state are acquired; and each partition API value and a natural gamma value are obtained according to the working state of the drill collar and the API values of each gamma sensor in each partition around the drill collar. The application realizes gamma partitioning in the sliding drilling, solves the shortcoming that a conventional azimuth gamma instrument cannot be partitioned in the sliding drilling, and improves the reservoir drilling rate and development efficiency in slim hole operation.

Description

Technical Field

[0001] This invention relates to the field of logging while drilling in oil, and particularly to a three-probe azimuth gamma processing method and system. Background Technology

[0002] In recent years, the volume of sidetracking operations on older wells has increased, but the market supply of small drilling tools, small screws, small-diameter instruments, and corresponding special tools required for sidetracking older wells is insufficient. Therefore, developing small-sized azimuth gamma tools for horizontal well sidetracking of older wells is crucial to improving reservoir encounter rates, avoiding mudstone encounters, reducing downhole complexity caused by mudstone, improving development efficiency and profitability, and enhancing market competitiveness.

[0003] In sliding drilling, existing azimuth gamma processing methods cannot achieve zoning because the drill rod does not rotate. Summary of the Invention

[0004] Based on this, the embodiments of this application provide a three-probe azimuth gamma processing method and system, which can realize gamma partitioning in sliding drilling, solves the shortcomings of conventional azimuth gamma instruments that cannot partition during sliding drilling, and improves reservoir encounter rate and development efficiency in small-diameter well operations.

[0005] Firstly, a three-probe azimuth gamma processing method is provided, which includes:

[0006] The working state of the drill collar is obtained, including the combined drilling state and the sliding drilling state;

[0007] Set the working status and corresponding partition of the gamma sensor on the side wall of the drill collar, and obtain the API value of each gamma sensor in operation in each partition around the drill collar.

[0008] Based on the working status of the drill collar and the API values ​​of each zone around the drill collar by each gamma sensor, the API values ​​and natural gamma values ​​of each zone are obtained.

[0009] Optionally, the composite drilling state is when the rotation period of the drill collar is greater than 3 revolutions per minute;

[0010] The sliding drilling state is defined as the rotation period of the drill collar being less than 3 revolutions per minute.

[0011] Optionally, setting the operating status and corresponding partitions of the gamma sensor on the drill collar sidewall includes:

[0012] The horizontal plane around the drill collar is divided into 2, 4, or 8 equal sections.

[0013] Optionally, setting the operating status and corresponding partitions of the gamma sensor on the drill collar sidewall includes:

[0014] The drill collar is equipped with three gamma sensors on its sidewall, with a horizontal spacing of 120° between each pair of gamma sensors.

[0015] Optionally, when all three gamma sensors are operational, the API value and natural gamma value of each zone around the drill collar are obtained based on the working status of the drill collar and the API values ​​of each gamma sensor in each zone around the drill collar, including:

[0016] When the drill collar is in a combined drilling state, the following formula applies:

[0017]

[0018] Obtain the partition API value, where API1E, API2E, and API3E are the API values ​​measured by the three gamma sensors in the current partition, respectively.

[0019] Through the formula:

[0020]

[0021] The natural gamma values ​​were obtained, where API1N, API2N, and API3N are the natural gamma values ​​measured by the three gamma sensors, respectively.

[0022] Optionally, when both gamma sensors are in operation, the API value and natural gamma value of each zone around the drill collar are obtained based on the working state of the drill collar and the API value of each gamma sensor in each zone around the drill collar, including:

[0023] When the drill collar is in a combined drilling state, the following formula applies:

[0024]

[0025] Obtain the partition API value, where APIxE and APIyE are the API values ​​measured by the two gamma sensors in the current partition, respectively;

[0026] Through the formula:

[0027]

[0028] The natural gamma values ​​are obtained, where APIxN and APIyN are the natural gamma values ​​measured by the two gamma sensors, respectively.

[0029] Optionally, when one gamma sensor is in operation, the API value and natural gamma value of each zone are obtained based on the working state of the drill collar and the API values ​​of each zone around the drill collar by each gamma sensor, including:

[0030] When the drill collar is in a combined drilling state, the following formula applies:

[0031] APIE = APIzE

[0032] Obtain the partition API value, where APIzE are the API values ​​measured by a gamma sensor in the current partition;

[0033] Through the formula:

[0034] APIN = APIzN

[0035] The natural gamma value is obtained, where API and zN are the natural gamma values ​​measured by a single gamma sensor.

[0036] Optionally, based on the working state of the drill collar and the API values ​​of each gamma sensor in each zone around the drill collar, the API values ​​and natural gamma values ​​of each zone are obtained, including:

[0037] When the drill collar is in a sliding drilling state, the following formula applies:

[0038]

[0039] The proportion PERn of each sensor in this region is obtained, where Angle_n represents the angle occupied by the gamma sensor in the current partition; n represents the nth gamma sensor, n = 1, 2, 3.

[0040] Through the formula:

[0041] APIE=API1×PER1+API2×PER2+API3×PER3

[0042] Obtain the partition API values, where API1, API2, and API3 represent the API values ​​of each gamma sensor, respectively.

[0043] Through the formula:

[0044]

[0045] Obtain the natural gamma value.

[0046] Optionally, setting the operating status of the gamma sensor on the drill collar sidewall further includes:

[0047] To determine if a gamma sensor is damaged, an API value of 0 or 512 indicates that the gamma sensor is damaged.

[0048] Secondly, a three-probe azimuth gamma processing system is provided, the system comprising:

[0049] The acquisition module is used to acquire the working status of the drill collar, which includes a combined drilling state and a sliding drilling state.

[0050] The setting module is used to set the working status and corresponding partition of the gamma sensor on the side wall of the drill collar, and to obtain the API values ​​of each gamma sensor in operation in each partition around the drill collar.

[0051] The processing module is used to obtain the API value and natural gamma value of each zone based on the API value of each zone around the drill collar from each gamma sensor.

[0052] The technical solution provided in this application first obtains the working state of the drill collar, including a composite drilling state and a sliding drilling state; it then sets the working state and corresponding partitions of the gamma sensors on the drill collar sidewall, and obtains the API values ​​of each gamma sensor in operation in each partition around the drill collar; based on the working state of the drill collar and the API values ​​of each gamma sensor in each partition around the drill collar, it obtains the API value and natural gamma value of each partition. It can be seen that the beneficial effects of this invention are:

[0053] 1) Gamma partitioning is achieved during sliding drilling, which solves the problem that conventional azimuth gamma instruments cannot partition during sliding drilling.

[0054] 2) Improve reservoir encounter rate and development efficiency in small-diameter well operations. Attached Figure Description

[0055] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0056] Figure 1 A flowchart of a three-probe azimuth gamma processing method provided in this application embodiment;

[0057] Figure 2 This application provides a three-probe gamma location map and partition map for embodiments of the present application. Detailed Implementation

[0058] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] This application's three-probe azimuth gamma sensor consists of three gamma sensors, each distributed 120° apart circumferentially. It can achieve gamma zoning in both sliding and composite drilling, and can calculate multiple zones. In composite drilling, it functions similarly to a standard azimuth gamma sensor, providing the API value for each zone's gamma. For details, please refer to... Figure 1 The document illustrates a flowchart of a three-probe azimuth gamma processing method provided in an embodiment of this application. The method may include the following steps:

[0060] Step 101: Obtain the working status of the drill collar.

[0061] The working state includes a composite drilling state and a sliding drilling state. In this embodiment, the composite drilling state is determined by a speed of 3 revolutions per minute or more, and the sliding drilling state is determined by a speed of less than 3 revolutions per minute.

[0062] Step 102: Set the working status and corresponding partition of the gamma sensor on the drill collar sidewall, and obtain the API values ​​of each gamma sensor in operation in each partition around the drill collar.

[0063] In this embodiment, it is first determined whether the gamma sensor is damaged. If the API value of the gamma sensor is 0 or 512, it is considered that the gamma sensor is damaged.

[0064] like Figure 2 The area to be measured near the drill collar is divided into zones, and the working status of the gamma sensors on the drill collar sidewall is set: In composite drilling, three gamma sensors can be selected as 1, 2, or 3 (set via program). The azimuth gamma calculates 8 zones each time, and the output can be set to 8, 4, or 2 zones. If set to 4 zones, zones 1 and 8 are merged into the upper zone, zones 4 and 5 are merged into the lower zone, zones 2 and 3 are merged into the right zone, and zones 6 and 7 are merged into the left zone. If set to 2 zones, zones 1, 2, 7, and 8 are merged into the upper zone, and zones 3, 4, 5, and 6 are merged into the lower zone.

[0065] Partitioning algorithm when setting up one gamma sensor for operation:

[0066] The gamma sensor's count values ​​in eight zones are combined based on zone settings 2, 4, and 8 to calculate the API value for each zone. Natural gamma calculates the API value using these gamma sensor count values.

[0067] Partitioning algorithm when setting 2 or 3 gamma sensors to work

[0068] Each gamma sensor counts values ​​in 8 zones. Depending on the zone settings (2, 4, or 8), each gamma sensor merges the count values ​​from each zone to calculate the API value for each zone. At this point, each zone has 2 or 3 API values. Averaging these API values ​​gives the API value for that zone. Natural gamma calculates the API value for each gamma sensor and then averages these API values ​​to obtain the natural gamma value.

[0069] Step 103: Based on the working status of the drill collar and the API values ​​of each gamma sensor in each zone around the drill collar, obtain the API value and natural gamma value of each zone.

[0070] Specifically, for the calculation of zoned gamma APIE (there are 8 zones in total), when 3 gamma sensors are set to work:

[0071]

[0072] Among them, API1E, API2E, and API3E are the API values ​​measured by the three gamma sensors in the current partition, respectively.

[0073] When two gamma sensors are set to work:

[0074]

[0075] APIxE and APIyE are the API values ​​measured by the two gamma sensors in the current partition, respectively.

[0076] When one gamma sensor is set to work:

[0077] APIE = APIzE

[0078] APIzE represents the API value measured by a gamma sensor in the current partition.

[0079] For calculating the natural gamma APIN, when setting up 3 gamma sensors to operate:

[0080]

[0081] API1N, API2N, and API3N are the natural gamma values ​​measured by the three gamma sensors, respectively.

[0082] When two gamma sensors are set to work:

[0083]

[0084] APIxN and APIyN are the natural gamma values ​​measured by the two gamma sensors, respectively.

[0085] When one gamma sensor is set to work:

[0086] APIN = APIzN

[0087] API and zN are the natural gamma values ​​measured by a single gamma sensor.

[0088] When the drill collar is in sliding drilling mode, the gamma range that the three gamma sensors can measure is 60° clockwise and 60° counterclockwise from each sensor. That is, each gamma sensor has a 120° range, and the three sensors together cover 360°. API value calculation for 8 zones:

[0089] Through the formula:

[0090]

[0091] The proportion PERn of each sensor in this region is obtained, where Angle_n represents the angle occupied by the gamma sensor in the current partition; n represents the nth gamma sensor, n = 1, 2, 3.

[0092] Through the formula:

[0093] APIE=API1×PER1+API2×PER2+API3×PER3

[0094] Obtain the partition API values, where API1, API2, and API3 represent the API values ​​of each gamma sensor, respectively.

[0095] Through the formula:

[0096]

[0097] Obtain the natural gamma value.

[0098] This application also provides a three-probe azimuth gamma processing system. The system includes:

[0099] The acquisition module is used to acquire the working status of the drill collar, which includes composite drilling status and sliding drilling status.

[0100] The configuration module is used to set the working status and corresponding partitions of the gamma sensors on the drill collar sidewall, and to obtain the API values ​​of each gamma sensor in operation in each partition around the drill collar.

[0101] The processing module is used to obtain the API value and natural gamma value of each zone based on the API value of each gamma sensor in each zone around the drill collar.

[0102] The three-probe azimuth gamma processing system provided in this application embodiment is used to implement the above-described three-probe azimuth gamma processing method. Specific limitations of the three-probe azimuth gamma processing system can be found in the limitations of the three-probe azimuth gamma processing method described above, and will not be repeated here. Each component of the above-described three-probe azimuth gamma processing system can be implemented entirely or partially through software, hardware, or a combination thereof. Each module can be embedded in or independent of the processor in the device in hardware form, or stored in the memory of the device in software form, so that the processor can call and execute the operations corresponding to each module.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A three-probe azimuthal gamma processing method, characterized in that, The method comprises: obtaining the working state of the drill collar, the working state comprising a combined drilling state and a sliding drilling state; setting the working state of the gamma sensor on the side wall of the drill collar and the corresponding partition, obtaining the API value of each gamma sensor in each partition around the drill collar in the running state; obtaining the partition API value and the natural gamma value according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar; the combined drilling state is that the rotation period of the drill collar is greater than 3 revolutions per minute when the drill collar is working; the sliding drilling state is that the rotation period of the drill collar is less than 3 revolutions per minute when the drill collar is working; the setting of the working state of the gamma sensor on the side wall of the drill collar and the corresponding partition comprises that the horizontal plane around the drill collar is set as 2, 4 or 8 partitions; the setting of the working state of the gamma sensor on the side wall of the drill collar and the corresponding partition comprises that the side wall of the drill collar is provided with 3 gamma sensors, and each two gamma sensors are horizontally spaced apart by 120°; when the 3 gamma sensors are all in the running state, the obtaining of the partition API value and the natural gamma value according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar comprises: when the drill collar is in the combined drilling state, the partition API value is obtained by the formula: wherein API1E, API2E and API3E are respectively the API values measured by the 3 gamma sensors in the current partition; the natural gamma value is obtained by the formula: wherein API1N, API2N and API3N are respectively the natural gamma values measured by the 3 gamma sensors; the obtaining of the partition API value and the natural gamma value according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar comprises: when the drill collar is in the sliding drilling state, the proportion PERn of each sensor in the current partition is obtained by the formula: wherein Angle_n represents the angle of the gamma sensor in the current partition; n represents the nth gamma sensor, and n = 1, 2, 3; the partition API value is obtained by the formula: APIE = API1 × PER1 + API2 × PER2 + API3 × PER3 wherein API1, API2 and API3 represent respectively the API values of the gamma sensors; the natural gamma value is obtained by the formula: the setting of the working state of the gamma sensor on the side wall of the drill collar further comprises: judging whether the gamma sensor is damaged or not, and considering that the gamma sensor is damaged when the API value of the gamma sensor is 0 or 512. when 2 gamma sensors are in the running state, the obtaining of the partition API value and the natural gamma value according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar comprises: when the drill collar is in the combined drilling state, the partition API value is obtained by the formula:

2. The method of claim 1, wherein, wherein APIxE and APIyE are respectively the API values measured by the 2 gamma sensors in the current partition; the natural gamma value is obtained by the formula: ​ ​ obtaining the natural gamma value, wherein APIxN and APIyN are respectively the natural gamma values measured by the two gamma sensors.

3. The method of claim 1, wherein, When one gamma sensor is in the running state, the characteristic is that the API value and the natural gamma value of each partition are obtained according to the working state of the drill collar and the API values of each gamma sensor in each partition around the drill collar, including: When the drill collar is in the composite drilling state, the API value of the current partition is obtained by the formula: APIE = APIzE obtaining the API value of the partition, wherein APIzE is respectively the API value measured by one gamma sensor in the current partition; obtaining the natural gamma value by the formula: APIE = APIzE obtaining the API value of the partition, wherein APIzE is respectively the API value measured by one gamma sensor in the current partition; 4. A three-probe azimuthal gamma processing system characterized by, obtaining the natural gamma value by the formula: APIE = APIzE The system comprises: an acquisition module, configured to acquire the working state of the drill collar, wherein the working state comprises a composite drilling state and a sliding drilling state; a setting module, configured to set the working state of the gamma sensor on the sidewall of the drill collar and the corresponding partition, and acquire the API value of each gamma sensor in each partition around the drill collar in the running state; a processing module, configured to obtain the API value and the natural gamma value of each partition according to the API value of each gamma sensor in each partition around the drill collar; the composite drilling state is that the rotation period of the drill collar is greater than 3 revolutions per minute when the drill collar is working; and the sliding drilling state is that the rotation period of the drill collar is less than 3 revolutions per minute when the drill collar is working; the setting of the working state of the gamma sensor on the sidewall of the drill collar and the corresponding partition comprises that a horizontal plane around the drill collar is set as 2, 4 or 8 partitions; the setting of the working state of the gamma sensor on the sidewall of the drill collar and the corresponding partition comprises that the sidewall of the drill collar is provided with three gamma sensors, and each two gamma sensors are horizontally spaced apart by 120°; when three gamma sensors are in the running state, the API value and the natural gamma value of each partition are obtained according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar, including: when the drill collar is in the composite drilling state, the API value of the current partition is obtained by the formula: obtaining the API value of the partition, wherein API1E, API2E and API3E are respectively the API values measured by the three gamma sensors in the current partition; obtaining the natural gamma value by the formula: obtaining the natural gamma value by the formula: obtaining the API value and the natural gamma value of each partition according to the working state of the drill collar and the API value of each gamma sensor in each partition around the drill collar, including: when the drill collar is in the sliding drilling state, the API value and the natural gamma value of each partition are obtained by the formula: obtaining the proportion PERn of each sensor in the current partition, wherein Angle_n represents the angle occupied by the gamma sensor in the current partition; n represents the nth gamma sensor, and n = 1, 2, 3; obtaining the API value of the current partition by the formula: APIE = API1 × PER1 + API2 × PER2 + API3 × PER3 The partition API value is obtained, wherein API1, API2 and API3 represent API values of the respective gamma sensors; The natural gamma value is obtained through the formula: The setting of the working state of the gamma sensor on the collar sidewall further includes: It is judged whether the gamma sensor is damaged, and the gamma sensor is considered to be damaged when the API value of the gamma sensor is 0 or 512. ​

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