阅读说明：本技术 一种基于螺旋输送机实时测量钻井岩屑重量的方法 (Method for measuring weight of drilling cuttings in real time based on spiral conveyor ) 是由 李雷 张继川 陆灯云 白璟 李伟成 黄崇君 万夫磊 明显森 范黎明 贾利春 刘殿 于 2020-11-05 设计创作，主要内容包括：本发明公开了一种基于螺旋输送机实时测量钻井岩屑重量的方法,涉及石油钻井技术领域,其包括以下步骤：1：测量开始时,采集螺旋轴的转动圈数,在采集过程中,每当螺旋轴的转动圈数值等于螺旋轴的螺距数量值时计为一个转动周期,依此划分出多个转动周期；2：根据螺旋输送机在转动周期开始时刻的初始重量和结束时刻的实时重量,计算岩屑在转动周期内的实际输送重量；3：测量结束时,求和各个转动周期内岩屑的实际输送重量即得出测量期间岩屑的总重量。本发明以螺旋输送机为基础,能够从任一时刻开始实现钻井返出岩屑的实时在线精确计量,从而为井底岩屑状况的判别提供有效依据。(The invention discloses a method for measuring the weight of drilling cuttings in real time based on a screw conveyor, which relates to the technical field of petroleum drilling and comprises the following steps: 1: collecting the number of turns of the screw shaft when the measurement is started, and in the collecting process, when the number of the turns of the screw shaft is equal to the number of the screw pitches of the screw shaft, the number is one rotation period, and a plurality of rotation periods are divided according to the number; 2: calculating the actual conveying weight of the rock debris in the rotation period according to the initial weight of the screw conveyor at the start time and the real-time weight of the screw conveyor at the end time of the rotation period; 3: and when the measurement is finished, summing the actual conveying weight of the rock debris in each rotation period to obtain the total weight of the rock debris in the measurement period. The invention is based on the screw conveyor, and can realize real-time online accurate measurement of the drilling return rock debris from any moment, thereby providing an effective basis for distinguishing the well bottom rock debris condition.)

1. A method for measuring the weight of drilling cuttings in real time based on a screw conveyor is characterized by comprising the following steps:

step 1: collecting the number of turns of the screw shaft when the measurement is started, and in the collecting process, when the number of the turns of the screw shaft is equal to the number of the screw pitches of the screw shaft, the number is one rotation period, and a plurality of rotation periods are divided according to the number;

step 2: calculating the actual conveying weight of the rock debris in the rotation period according to the initial weight of the screw conveyor at the start time and the real-time weight of the screw conveyor at the end time of the rotation period;

and step 3: when the measurement is finished, if the rotating ring value of the spiral shaft acquired at the moment of finishing the measurement is equal to the thread pitch value of the spiral shaft, the last rotating period is a complete rotating period, and the actual conveying weight of the rock debris in each rotating period is summed to obtain the total weight of the rock debris in the measuring period; and if the rotating circle value of the spiral shaft acquired at the moment of finishing the measurement is not equal to the thread pitch value of the spiral shaft, the last rotating period is an incomplete rotating period, the real-time weight of the spiral conveyor at the moment of finishing the previous rotating period is taken as the initial weight of the incomplete rotating period, the actual conveying weight of the rock debris in the incomplete rotating period is calculated by combining the real-time weight of the spiral conveyor at the moment of finishing the measurement, and finally the total weight of the rock debris in the measuring period is obtained by combining the actual conveying weights of the rock debris in the rest rotating periods and summing.

2. The method for measuring the weight of the drill cuttings in real time based on the spiral conveyor as claimed in claim 1, wherein the method comprises the following steps: in the step 1, after each rotation period is divided, the rotation circle value is reset to zero and accumulated again, and the next rotation period is divided.

3. The method for measuring the weight of the drill cuttings in real time based on the spiral conveyor as claimed in claim 1, wherein the method comprises the following steps: in the step 2, the initial weight and the real-time weight are acquired by the weight sensor, and when the initial weight and the real-time weight are acquired, the vibration acceleration in the longitudinal direction is also acquired correspondingly by the longitudinal vibration sensor; and then, respectively calibrating the initial weight and the real-time weight according to the vibration acceleration, and calculating the actual conveying weight of the rock debris in the rotation period according to the calibrated initial weight and the calibrated real-time weight.

4. The method for measuring the weight of the drill cuttings in real time based on the spiral conveyor as claimed in claim 3, wherein the method comprises the following steps: the calibration method comprises the following steps:

G=G0*g/（g±g1）

in the formula, G represents the weight after calibration, G0 represents the weight before calibration, G represents the gravitational acceleration, and G1 represents the vibration acceleration in the longitudinal direction.

5. The method for real-time measurement of weight of drill cuttings based on screw conveyors according to any one of claims 1-4, wherein: in the step 2, between two adjacent rotation periods, the real-time weight of the screw conveyor at the end of the previous rotation period is the initial weight of the screw conveyor at the start of the next rotation period.

Technical Field

The invention relates to the technical field of petroleum drilling, in particular to a method for measuring the weight of drilling cuttings in real time based on a spiral conveyor.

Background

Along with the continuous propulsion of shale gas exploration and development, major displacement wells and horizontal wells in Sichuan Yu areas, particularly three-dimensional cluster horizontal wells, are greatly increased, wherein 90% of horizontal wells for shale gas deployment are three-dimensional horizontal wells, and horizontal sections are longer and longer. In the well drilling of the horizontal well, detritus beds are easily formed at the positions of the lower well wall of the large-inclination section and the horizontal well section to be accumulated, so that friction resistance and torque are greatly increased, complex conditions such as drill sticking, pump holding and the like can be caused, the service life of a drilling tool and drilling safety are seriously influenced, and the engineering delay cost is increased. Meanwhile, the problems of difficult well logging tool running, difficult casing well cementing, poor well cementing quality and the like can be caused due to insufficient well cleaning. The measurement of the rock debris is one of key technologies for judging the return condition of the rock debris in the well in the drilling process, the surplus of the rock debris in the well can be represented through the measurement of the rock debris, engineering technicians can make measures in time, and underground accidents are reduced.

At present, according to the latest environmental protection requirement, the current drilling team is generally provided with a rock debris falling-proof device, namely, rock debris is conveyed by a screw conveyor, enters from a feeding hole at one end of the screw conveyor and is output from a discharging hole at the other end under the driving of a screw shaft. However, such screw conveyors generally only have a conveying function, and cannot perform online measurement on the conveyed rock debris in the conveying process, so that a new technology capable of realizing online measurement of the rock debris in the conveying process needs to be researched, so that the condition of the rock debris at the bottom of a well can be judged in real time, the safety of long-horizontal-section drilling is guaranteed, and the drilling efficiency is improved.

In addition, the prior art with publication number CN210719361U discloses a novel rock debris weighing device, which comprises a fixed support and a circular arc-shaped hopper, wherein the fixed support is integrally formed by a vertical support and two L-shaped supports, the hopper is arranged on the L-shaped support at the lower end of the fixed support, a weighing sensor is arranged at the joint of the hopper and the fixed support, proximity switches are arranged on two sides of the fixed support at the bottom of the hopper, the weighing sensor is connected with a display, a vibration motor is arranged at the bottom of the hopper, and a hydraulic rocker arm is arranged on the fixed support and used for connecting the fixed support and the hopper. Although the technology can detect the rock debris data in real time, equipment needs to be customized, the rock debris is required to be automatically turned and poured out after being filled into a set material level, the rock debris cannot enter the rock debris in the period of time, otherwise, the metering cannot be carried out, and the technical problem of discontinuous metering exists.

Disclosure of Invention

The invention aims to overcome the technical problems in the prior art and provides a method for measuring the weight of drilling cuttings in real time based on a spiral conveyor.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for measuring the weight of drilling cuttings in real time based on a screw conveyor is characterized by comprising the following steps:

step 1: collecting the number of turns of the screw shaft when the measurement is started, and in the collecting process, when the number of the turns of the screw shaft is equal to the number of the screw pitches of the screw shaft, the number is one rotation period, and a plurality of rotation periods are divided according to the number;

step 2: calculating the actual conveying weight of the rock debris in the rotation period according to the initial weight of the screw conveyor at the start time and the real-time weight of the screw conveyor at the end time of the rotation period;

and step 3: when the measurement is finished, if the rotating ring value of the spiral shaft acquired at the moment of finishing the measurement is equal to the thread pitch value of the spiral shaft, the last rotating period is a complete rotating period, and the actual conveying weight of the rock debris in each rotating period is summed to obtain the total weight of the rock debris in the measuring period; and if the rotating circle value of the spiral shaft acquired at the moment of finishing the measurement is not equal to the thread pitch value of the spiral shaft, the last rotating period is an incomplete rotating period, the real-time weight of the spiral conveyor at the moment of finishing the previous rotating period is taken as the initial weight of the incomplete rotating period, the actual conveying weight of the rock debris in the incomplete rotating period is calculated by combining the real-time weight of the spiral conveyor at the moment of finishing the measurement, and finally the total weight of the rock debris in the measuring period is obtained by combining the actual conveying weights of the rock debris in the rest rotating periods and summing.

In the step 1, after each rotation period is divided, the rotation circle value is reset to zero and accumulated again, and the next rotation period is divided.

In the step 2, the initial weight and the real-time weight are acquired by the weight sensor, and when the initial weight and the real-time weight are acquired, the vibration acceleration in the longitudinal direction is also acquired correspondingly by the longitudinal vibration sensor; and then, respectively calibrating the initial weight and the real-time weight according to the vibration acceleration, and calculating the actual conveying weight of the rock debris in the rotation period according to the calibrated initial weight and the calibrated real-time weight.

The calibration method comprises the following steps:

G=G0*g/（g±g1）

in the formula, G represents the weight after calibration, G0 represents the weight before calibration, G represents the gravitational acceleration, and G1 represents the vibration acceleration in the longitudinal direction.

In the step 2, between two adjacent rotation periods, the real-time weight of the screw conveyor at the end of the previous rotation period is the initial weight of the screw conveyor at the start of the next rotation period.

The invention has the advantages that:

1. the invention is based on the screw conveyor, can realize the real-time online accurate measurement of the drilling return rock debris from any moment, can record and store the rock debris weight value of each time point, can meet different monitoring requirements of field operators, and provides an effective basis for the judgment of the well bottom rock debris condition.

2. The invention can realize the refitting of field equipment by simply adding a plurality of sensors, has strong adaptability and can simply and economically refit the field.

3. According to the invention, the rock debris weight sampling value of the discrete point is adopted to describe the rock debris weight of the whole measurement time period, and the control interference on the feeding port and the discharging port is not needed, so that the anti-interference capability is strong, and the weight value of the rock debris in the measurement time period can be obtained with high precision.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Labeled as: 1. the device comprises a screw conveyor, 2, a screw shaft, 3, a feeding hole, 4, a discharging hole, 5, a weight sensor, 6, a longitudinal vibration sensor, 7, a screw detector, 8, a rotating speed device, 9 and a supporting column.

Detailed Description

The invention discloses a method for measuring the weight of drilling cuttings in real time based on a screw conveyor, as shown in figure 1, the screw conveyor 1 can be fixed on the ground through a support column 9 and comprises a screw shaft 2, a feed inlet 3 and a discharge outlet 4, wherein the feed inlet 3 and the discharge outlet 4 are respectively arranged at the upper part and the lower part of two ends of the screw shaft 2 and are used for feeding and discharging cuttings. The method is suitable for accurately measuring the weight of the rock debris when the spiral conveyor 1 is started to convey the rock debris, and is also suitable for accurately measuring the weight of the rock debris from any moment in the process of conveying the rock debris. The method specifically comprises the following steps:

step 1: when the measurement is started, the number of rotation circles of the screw shaft 2 is collected from the moment of starting the measurement, and 1 is added to the number of the rotation circles when the screw shaft 2 rotates for each circle. In the collecting process, one rotation period is counted every time the number of the rotation turns of the screw shaft 2 is equal to the number of the thread pitches of the screw shaft 2; and after each rotation period is divided, the rotation circle value is reset to zero and accumulated again, the next rotation period is divided, and a plurality of rotation periods are divided according to the division until the measurement is finished.

In this step, the number of screw pitches of the screw shaft 2 refers to the number of pitches between the screw teeth on the screw shaft 2, and the specific data thereof can be obtained according to the screw shaft 2 actually used. The rotation period is divided according to the thread pitch quantity value of the screw shaft 2, so that all the rock debris in the previous rotation period can be just output from the discharge hole 4 when the next rotation period starts.

Step 2: and calculating the actual conveying weight of the rock debris in the rotation period according to the initial weight of the screw conveyor 1 at the starting moment and the real-time weight of the screw conveyor at the ending moment of the rotation period. The actual conveying weight in each rotation period is automatically output from the discharge opening 4 of the screw conveyor 1 at the beginning of the following rotation period.

In this step, the initial weight and the real-time weight are acquired by the weight sensors 5 arranged below the supporting columns 9, the number of the weight sensors 5 is preferably two, and the initial weight and the real-time weight are the sum of the measured values of the two weight sensors 5. In addition, when the initial weight and the real-time weight are collected, the longitudinal vibration sensor 6 arranged on one of the supporting columns 9 is preferably used for simultaneously and correspondingly collecting the vibration acceleration in the longitudinal direction, so that the initial weight and the real-time weight can be conveniently calibrated, the influence of vibration on metering in the conveying process is eliminated, and the measuring accuracy is improved. Specifically, at the rotation cycle start timing, the initial weight at that timing is taken in by the weight sensor 5, while the vibration acceleration at that timing is collected by the longitudinal vibration sensor 6. At the end of the rotation cycle, the real-time weight at this point in time is used by the weight sensor 5, while the vibration acceleration at this point in time is detected by the longitudinal vibration sensor 6. After the acquisition, the initial weight and the real-time weight are respectively calibrated according to the corresponding vibration acceleration, and then the actual conveying weight of the rock debris in the rotation period can be calculated by subtracting the initial weight from the calibrated real-time weight.

Further, the calibration method comprises:

G=G0*g/（g±g1）

in the formula, G represents the weight after calibration, G0 represents the weight before calibration, G represents the acceleration of gravity, G1 represents the acceleration of vibration in the longitudinal direction, and ± represents the acceleration direction downward or upward.

In this step, since the rotation periods are continuous, the real-time weight of the screw conveyor 1 at the end of the previous rotation period between two adjacent rotation periods is the initial weight of the screw conveyor 1 at the start of the next rotation period.

And step 3: when the measurement is finished, if the rotating circle value of the spiral shaft 2 acquired at the moment of finishing the measurement is equal to the thread pitch value of the spiral shaft 2, the last rotating period is a complete rotating period, and the actual conveying weight of the rock debris in each rotating period is summed to obtain the total weight of the rock debris in the measuring period; and if the rotating circle value of the spiral shaft 2 acquired at the moment of finishing the measurement is not equal to the thread pitch value of the spiral shaft 2, the last rotating period is an incomplete rotating period, the real-time weight of the spiral conveyor 1 at the moment of finishing the previous rotating period is taken as the initial weight of the incomplete rotating period, the actual conveying weight of the rock debris in the incomplete rotating period is calculated by combining the real-time weight of the spiral conveyor 1 at the moment of finishing the measurement, and finally the total weight of the rock debris in the measuring period is obtained by combining the actual conveying weights of the rock debris in the rest rotating periods and summing. Wherein, the initial weight and the real-time weight involved in the step are calibrated weights.

In this step, if the rotation number of the screw shaft 2 collected at the measurement end time is not equal to the pitch number of the screw shaft 2, the last rotation period is an incomplete rotation period. Then the method for calculating the actual conveying weight of the rock debris in the incomplete rotation period is as follows:

setting the number value of the screw pitch of the screw shaft as n, the number value of the rotation circle acquired at the measurement ending moment as m, the real-time weight after the calibration of the measurement ending moment as G2, the real-time weight after the calibration of the previous rotation period ending moment as G1, and the real-time weight G1 as the initial weight of the incomplete rotation period starting moment, wherein the actual conveying weight in the incomplete rotation period is as follows:

M=m/n*（G2-G1）

where M represents the actual delivered weight during the incomplete rotation cycle.

The invention can acquire the number of turns of rotation by a spiral detector 7 arranged above the spiral shaft 2 through non-contact signals such as laser and the like, or acquire the number of turns of rotation through a speed changer 8 arranged on a power shaft of the spiral conveyor 1. In addition, the weight sensor 5, the longitudinal vibration sensor 6, the spiral detector 7 and the speed rotator 8 are all connected with a processor of the well site control center, and information collection, calculation and the like involved in the whole measurement process can be processed by the processor of the well site control center.

Finally, the applicant adopts the method of the invention to carry out the test for 1 hour from any time, meanwhile, the material storage tank is arranged at the discharge port 4 for collection and verification, and finally, the two are compared, so that the measuring accuracy of the method can reach 1 percent, the accuracy is high, and the method can effectively provide a basis for distinguishing the condition of the rock debris at the bottom of the well.

While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.