CN114320189A - Screwing control method of threaded pipe joint - Google Patents
Screwing control method of threaded pipe joint Download PDFInfo
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- CN114320189A CN114320189A CN202011047811.9A CN202011047811A CN114320189A CN 114320189 A CN114320189 A CN 114320189A CN 202011047811 A CN202011047811 A CN 202011047811A CN 114320189 A CN114320189 A CN 114320189A
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- 238000000034 method Methods 0.000 title claims abstract description 87
- 230000008569 process Effects 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims 2
- 239000003921 oil Substances 0.000 description 6
- 239000003129 oil well Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The invention discloses a screwing control method of a threaded pipe joint, wherein the threaded pipe joint comprises a male end pipe body and a female end coupling, and in the screwing process of the male end pipe body and the female end coupling: when the screwing process is in the thread section, controlling the screwing speed to be a first speed V1, and controlling the first speed V1 to be a constant speed; when the screwing process is in the sealing surface segment, controlling the screwing speed to be a second speed V2, and controlling the second speed V2 to be a gradually reduced speed; when the screwing process is in the shoulder section, controlling the screwing speed to be a third speed V3, and controlling the third speed V3 to be a gradually reduced speed; wherein the second speed V2 is less than the first speed V1, the third speed V3 is less than the second speed V2, and the third speed V3 is finally reduced to 0.
Description
Technical Field
The invention relates to a screwing control method, in particular to a screwing control method of a connector.
Background
The oil casing is a special pipe in oil exploitation engineering, supports the well wall after the drilling is finished, and conveys crude oil and natural gas to the surface of the earth through the oil pipe, and finally oil and gas exploitation is finished. In the process, the connection between the oil pipe and the connection between the casing and the casing are realized through threaded pipe joints.
According to the relevant standards, after the oil well pipe and the coupling are screwed together, effective screwing and sealing must be achieved, as shown in fig. 1, wherein fig. 1 schematically shows the screwed-together matching diagram of the oil well pipe and the coupling, and A, C indicates the oil well pipe; b represents a coupling; d represents an external thread; and E denotes an internal thread.
In oil well pipes, most specialty thread products provide a metal-to-metal seal at the threaded end for sealing performance. During screwing, after the two sealing surfaces are in contact, the screwing torque suddenly rises, which can be called an inflection point. At present, most of the judgment bases for screwing the special thread are two: the first thread is the same as the API standard thread, and whether the final termination torque is in a qualified range is judged; the second is whether the knee torque is within the qualified range.
The actual screwing process of the oil well pipe is an unstable state, and the screwing curve is greatly fluctuated by various factors such as the thread ovality, the coaxiality of a male head and a female head, the thread surface state, the thread grease quality and the smearing condition, the screwing speed and the like of the steel pipe and the coupling. Even if the same batch of steel pipes and couplings with similar working conditions are screwed, the screwing curve can generate larger difference, particularly, the fluctuation of the screwing curve of the sealing surface section can seriously influence the inflection point identification on the curve, influence the accuracy of screwing qualification judgment and also lead to the reduction of qualification rate.
Based on this, in order to solve the above problems, the present invention is expected to obtain a special screwing control method, which can effectively eliminate the influence of the above factors and ensure that the inflection point characteristic on the curve of the screwing stage of the sealing surface is obvious.
Disclosure of Invention
The object of the present invention is to provide a screwing control method of a threaded pipe joint which is different from the prior art screwing method at a constant spindle speed. The screwing control method of the threaded pipe joint provided by the invention has the advantages that the screwing quality is not influenced, the screwing time is saved and the obvious inflection point characteristic on a curve at the screwing stage of the sealing surface can be ensured by adjusting the speed in the screwing process.
In order to achieve the above object, the present invention provides a screwing control method of a threaded pipe joint, the threaded pipe joint including a pin body and a box coupling, wherein in a screwing process of the pin body and the box coupling:
when the screwing process is in the thread section, controlling the screwing speed to be a first speed V1, and controlling the first speed V1 to be a constant speed;
when the screwing process is in the sealing surface segment, controlling the screwing speed to be a second speed V2, and controlling the second speed V2 to be a gradually reduced speed;
when the screwing process is in the shoulder section, controlling the screwing speed to be a third speed V3, and controlling the third speed V3 to be a gradually reduced speed;
wherein the second speed V2 is less than the first speed V1, the third speed V3 is less than the second speed V2, and the third speed V3 is finally reduced to 0.
In the technical scheme of the invention, the screwing control method of the threaded pipe joint comprises the following steps: the constant speed (high speed relative to the second speed) is used when the screwing process is in the thread section, so that the design can save screwing time without influencing screwing quality. Correspondingly, when the screwing process is in the sealing surface section and/or the shoulder section, the speed is gradually reduced by adopting a variable speed algorithm, and the design can effectively avoid the impact of the overhigh screwing speed on the sealing surface and/or the shoulder, so that the screwing curve is smoother.
Further, in the screwing control method of a threaded pipe joint according to the present invention, the first speed V1 is 4 to 6 revolutions per minute.
Further, in the screwing control method of a threaded pipe joint according to the present invention, the second speed V2 is gradually decreased in a linear manner.
Further, in the screwing control method of a threaded pipe joint according to the present invention, the third speed V3 is gradually decreased in a linear manner.
Further, in the screwing control method of a threaded pipe joint according to the present invention, the third speed V3 is K3 × V1, where K3 is (Nb-Ns)/Nb, where Nb represents a known optimum torque and Ns represents a measured torque that varies in real time during screwing.
Further, in the screwing control method of a threaded pipe joint according to the present invention, the second speed V2 is K2 × V1, where K2 is (0.8 to 0.9) K3.
Further, in the screwing control method of the threaded pipe joint according to the present invention, when the measured torque Ns that changes in real time is greater than the deceleration torque Nj, the change from the first speed V1 to the second speed V2 is started, wherein the deceleration torque Nj is 10 to 20% of the optimum torque.
Further, in the screwing control method of the threaded pipe joint, an acquisition module is adopted to acquire the actually measured torque Ns.
Compared with the prior art, the screwing control method of the threaded pipe joint has the following beneficial effects:
different from the method for screwing at constant spindle speed in the prior art, the screwing control method of the threaded pipe joint uses constant speed (high speed) when the screwing process is in the threaded section, and the design can save screwing time without influencing screwing quality.
Correspondingly, when the screwing process is in the sealing surface section, the invention adopts a variable speed algorithm, the speed of the variable speed algorithm is gradually reduced, and the design can effectively avoid the impact of the overhigh screwing speed on the sealing surface, thereby ensuring that the screwing curve is smoother. In addition, when the screwing process is in the shoulder section, the speed of the screwing process is gradually reduced by adopting a variable speed algorithm, and the design can avoid the impact of the overhigh screwing speed on the shoulder, so that the screwing curve is smoother.
In some preferred embodiments, the screwing control method of the threaded pipe joint according to the present invention can calculate the screwing speed setting through actual torques at each stage, that is, the speed setting of the pipe screwing spindle can be more suitable for the torque variation characteristics of the two stages, i.e., the sealing surface section and the shoulder section, the screwing is smoother, and the pipe screwing curve is more optimal.
Drawings
Figure 1 shows schematically a diagram of the threaded engagement of an oil country tubular good and a coupling.
Fig. 2 schematically shows a shift control diagram of a screwing control method of a threaded pipe joint according to an embodiment of the present invention.
Detailed Description
The method for controlling the screwing of a threaded joint according to the invention will be further explained and illustrated with reference to the drawings and the specific examples of embodiment of the present invention, which, however, do not unduly limit the technical solution of the invention.
The invention provides a screwing control method of a threaded pipe joint, which is different from the prior constant speed of a pipe screwing main shaft, and calculates and adjusts the speed setting of the pipe screwing main shaft in real time according to actual torque according to a certain algorithm.
In the invention, the threaded pipe joint comprises a male end pipe body and a female end coupling, and in the screwing process of the male end pipe body and the female end coupling, the screwing process can respectively pass through three stages, namely a thread section, a sealing surface section and a shoulder section, wherein:
when the screwing process is in the thread section, controlling the screwing speed to be a first speed V1, and controlling the first speed V1 to be a constant speed;
when the screwing process is in the sealing surface segment, controlling the screwing speed to be a second speed V2, and controlling the second speed V2 to be a gradually reduced speed;
when the screwing process is in the shoulder section, controlling the screwing speed to be a third speed V3, and controlling the third speed V3 to be a gradually reduced speed;
wherein the second speed V2 is less than the first speed V1, the third speed V3 is less than the second speed V2, and the third speed V3 is finally reduced to 0.
It should be noted that in some embodiments, the first speed V1 in the screwing control method of the threaded joint according to the present invention may preferably be controlled to be 4 to 6 revolutions per minute, which may be adjusted according to product specifications and thread type characteristics.
Further, in some embodiments, the second speed V2 in the screwing control method of a threaded pipe joint according to the present invention may be gradually decreased in a linear manner. Accordingly, in some embodiments, the third speed V3 in the twist-on control method of the present invention may also be ramped linearly.
To better explain the application of the method for controlling the threading of a threaded pipe joint according to the present invention, the following embodiment shown in fig. 2 is used as a specific example for further explanation.
Fig. 2 schematically shows a shift control diagram of a screwing control method of a threaded pipe joint according to an embodiment of the present invention.
As shown in fig. 2, in the present embodiment, reference numeral 1 denotes a high speed section when the screwing process is in the thread section, reference numeral 2 denotes a low speed section when the screwing process is in the seal surface section, reference numeral 3 denotes a low speed section when the screwing process is in the shoulder section, reference numeral 6 denotes an actual torque Ns when the screwing process is in the thread section, reference numeral 7 denotes an actual torque Ns when the screwing process is in the seal surface section, reference numeral 8 denotes an actual torque Ns when the screwing process is in the shoulder section, P1 denotes a start point, P2 denotes a seal surface inflection point (deceleration torque Nj), P3 denotes a shoulder inflection point, and P4 denotes a screwing point.
It should be noted that, in fig. 2, the curve line segments corresponding to reference numerals 1, 2 and 3 represent the change curve of the number of turns versus the speed; the curve segments corresponding to reference numerals 6, 7 and 8 represent the change curve of the turn-torque.
As can be seen from fig. 2, in the present embodiment, the segment P1P2 in fig. 2 is a threaded segment, the segment P2P3 is a sealing surface segment, and the segment P3P4 is a shoulder segment. The screwing control method of the threaded pipe joint has the characteristic of small screwing torque in the threaded section of P1P2, and screws at a high speed V1 (which is high relative to the second speed), so that screwing time is shortened. In the screwing control method of the threaded pipe joint of the present invention, during the sealing surface section of P2P3, screwing is performed at the low-speed second speed V2 in this stage due to the gradual increase of the screwing torque. Accordingly, in the shoulder section of P3P4, the screwing-in torque is sharply increased, and further deceleration is required to perform screwing-in at the speed-change third speed V3.
It can be seen that, in the present embodiment, starting from the segment P2P3, the segments P2P3 and P3P4 are the process of gradually decreasing speed until the speed of the segment P3P4 (i.e., the shoulder segment) is 0, at which time the torque reaches the optimum torque, and the screwing process just stops.
In the method for controlling the screwing of a threaded pipe joint according to the present invention, the thread-length-controlled constant first speed V1 is 5 revolutions per minute in the present embodiment.
In this embodiment, during the screwing of the threaded tubular joint, the screwing process is at the sealing surface section P2P3 and the shoulder section P3P4, and deceleration is started. The second speed V2 of the seal land segment P2P3 and the third speed V3 of the shoulder segment P3P4 are both progressively lower speeds.
The third speed V3 can be obtained by the following formula (1):
V3＝ K3 ×V1 (1)
in the above equation, V1 represents the first speed, K3 ═ Nb-Ns/Nb, where Nb represents the known best torque and Ns represents the measured torque that varies in real time during make-up.
Accordingly, the second speed V2 of the sealing surface segment P2P3 can be obtained by the following formula (2):
V2＝ K2×V1 (2)
in the above formula, K2 is (0.8 to 0.9) K3.
In the screwing control method of the threaded pipe joint according to the present invention, the junction point P2 of the threaded segment P1P2 and the sealing surface segment P2P3 is the most desirable deceleration point for switching from high speed to low speed. In the present embodiment, when it is detected that the measured torque Ns, which changes in real time, is greater than the deceleration torque Nj, the screwing speed is started to be controlled from the first speed V1 to the second speed V2.
It follows that in this embodiment, it is important to acquire torque data during the screwing process. Therefore, in the screwing control method of the threaded pipe joint, in order to obtain accurate and reliable torque data, the acquisition module can be adopted to acquire the actually measured torque Ns.
In the embodiment of the present invention shown in fig. 2, the speed change process of the control pipe screwing may specifically include the following steps:
step (1): and a high-speed high-precision acquisition module is used for acquiring the torque signal so as to obtain a high-resolution torque value. And the torque acquisition frequency is 20 ms/point, so that the acquisition density is high enough.
Step (2): and a high-resolution analog quantity output module is used for outputting a voltage analog signal as a given speed signal of the pipe screwing spindle and outputting the given speed signal to a spindle transmission or a proportional valve.
And (3): the actual torque value is used as input, the speed set value is used as output, the output is calculated from the input according to the slope algorithm of the formula and various boundary conditions in software, and therefore the speed change process of the pipe screwing is actually controlled.
From the above, it can be seen that, unlike the prior art method of screwing at a constant spindle speed, the screwing control method of a threaded pipe joint according to the present invention uses a constant speed (high speed relative to the second speed) when the screwing process is in the threaded section, and such a design can save screwing time without affecting screwing quality. Correspondingly, when the screwing process is in the sealing surface section and/or the shoulder section, the speed is gradually reduced by adopting a variable speed algorithm, and the design can effectively avoid the impact of the overhigh screwing speed on the sealing surface and/or the shoulder, so that the screwing curve is smoother.
In some preferred embodiments, the screwing control method of the threaded pipe joint according to the present invention can calculate the screwing speed setting through actual torques at each stage, that is, the speed setting of the pipe screwing spindle can be more suitable for the torque variation characteristics of the two stages, i.e., the sealing surface section and the shoulder section, the screwing is smoother, and the pipe screwing curve is more optimal.
It should be noted that the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradicted by each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (8)
1. A screwing control method of a threaded pipe joint, the threaded pipe joint comprising a male end pipe body and a female end coupling, characterized in that, in the screwing process of the male end pipe body and the female end coupling:
when the screwing process is in the thread section, controlling the screwing speed to be a first speed V1, and controlling the first speed V1 to be a constant speed;
when the screwing process is in the sealing surface segment, controlling the screwing speed to be a second speed V2, and controlling the second speed V2 to be a gradually reduced speed;
when the screwing process is in the shoulder section, controlling the screwing speed to be a third speed V3, and controlling the third speed V3 to be a gradually reduced speed;
wherein the second speed V2 is less than the first speed V1, the third speed V3 is less than the second speed V2, and the third speed V3 is finally reduced to 0.
2. The screwing control method of a threaded tubular joint according to claim 1, characterized in that said first speed V1 is between 4 and 6 revolutions per minute.
3. The screwing control method of a threaded tubular joint according to claim 1, characterized in that said second speed V2 decreases gradually according to a linear curve.
4. The screwing control method of a threaded tubular joint according to claim 1, characterized in that said third speed V3 decreases gradually according to a linear curve.
5. The screwing control method of a threaded tubular joint according to claim 4, characterized in that said third speed V3-K3 x V1, where K3-n (Nb-Ns)/Nb, where Nb represents the known optimum torque and Ns represents the measured torque that varies in real time during the screwing process.
6. The screwing control method of a threaded pipe joint according to claim 5, wherein said second speed V2-K2 XV 1, wherein K2-K3 (0.8-0.9).
7. The screwing control method of a threaded pipe joint according to claim 1, characterized in that the change from the first speed V1 to the second speed V2 is started when the measured torque Ns, which varies in real time, is greater than the deceleration torque Nj, which is 10 to 20% of the optimum torque.
8. The screwing control method of a threaded pipe joint according to any one of claims 5 to 7, characterized in that the measured torque Ns is acquired by an acquisition module.
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| CN202011047811.9A CN114320189A (en) | 2020-09-29 | 2020-09-29 | Screwing control method of threaded pipe joint |
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| CN202011047811.9A CN114320189A (en) | 2020-09-29 | 2020-09-29 | Screwing control method of threaded pipe joint |
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