CN204371318U - A kind of gamma graduator for demarcating with boring gamma inserting tube - Google Patents

Abstract

The utility model discloses a gamma scale for calibrating a gamma probe tube while drilling, which comprises: an outer cylinder with openings at both ends and arranged horizontally; an inner cylinder with openings at both ends and horizontally sleeved on the outer cylinder inside, and coaxial with the outer cylinder; the outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, so that an annular space is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder; a plurality of support rings, respectively Sleeved on the outer wall of the inner cylinder at intervals, and located in the annular space between the inner cylinder and the outer cylinder; a plurality of radioactive source rods are evenly distributed in a circular shape and arranged in an annular space between the inner cylinder and the outer cylinder. space to simulate formation radioactivity; each radioactive source rod passes through each support ring in sequence along the axial direction of the inner cylinder to be fixedly arranged on the support ring. The utility model has the advantages of simple structure and convenient use, and can effectively calibrate the sensitivity of the gamma probe tube before formal detection while drilling, so as to ensure the stability and accuracy of the detection while drilling.

Description

A gamma scaler for calibrating gamma probe while drilling

technical field

The utility model relates to a gamma scaler, in particular to a gamma scaler for calibrating a gamma probe while drilling, belonging to a calibration tool for wireless measurement while drilling (MWD, Measure While Drilling) instruments.

Background technique

Wireless measurement-while-drilling instrument is a new type of measurement and logging instrument representing new drilling technology developed in the professional field of drilling. It can continuously monitor formation parameters, wellbore trajectory, etc. more and more important.

The gamma ray logging with the gamma ray probe while drilling plays an important role in the measurement while drilling. The sensitivity and some related characteristics of the gamma probe will change due to external influences; such as changes in the detection environment, instrument aging and fatigue use, replacement of parts during maintenance, etc. All these situations require that the stability of the gamma probe must be checked systematically and regularly with a calibration device before use. If it exceeds the range permitted by the index, the calibration needs to be re-calibrated, and the traceability and return of the instrument can be completed through on-site calibration. Uniformity requirements.

Therefore, based on the above, it is urgent to propose a gamma scaler for calibrating the gamma probe while drilling, which can timely and effectively detect the stability of the gamma probe to ensure that its measurement sensitivity does not exceed the allowable range.

Utility model content

The purpose of the utility model is to provide a gamma scale for calibrating the gamma probe while drilling. Stability and accuracy while performing detection while drilling.

In order to achieve the above object, the technical solution of the present utility model is to provide a gamma scale for calibrating the gamma probe while drilling, comprising: an outer cylinder with openings at both ends and arranged horizontally; an inner cylinder with openings at both ends and a horizontal Sleeved in the inside of the outer cylinder and coaxially arranged with the outer cylinder; the outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, so that an annular ring is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder space; a plurality of supporting rings are respectively sleeved on the outer wall of the inner cylinder at intervals, and are located in the annular space between the inner cylinder and the outer cylinder; a plurality of radioactive source rods are evenly distributed in the inner cylinder in a circumferential shape In the annular space between the outer cylinder and the outer cylinder, to simulate the radioactivity of the formation; each radioactive source rod passes through each support ring in sequence along the axial direction of the inner cylinder to be fixedly arranged on the support ring.

The radioactive source rod is made of tungsten-thorium alloy.

The inner diameter of the inner cylinder is larger than the outer diameter of the gamma probe sleeved with the centralizer; the inner cylinder of the gamma scale is sleeved on the gamma probe and is located outside the sensor of the gamma probe.

The gamma scale used for calibrating the gamma probe while drilling also includes a holding tile, which is used to fix the inner cylinder of the gamma scale on the outside of the sensor of the gamma probe.

The gamma scale used for calibrating the gamma probe while drilling also includes two ring-shaped end caps, which are respectively sleeved on the two ends of the outer wall of the inner cylinder and connected with the outer cylinder, and are connected by nuts Locking is used to connect the inner cylinder and the outer cylinder and fix the relative position between the inner cylinder and the outer cylinder.

The gamma scale for calibrating the gamma probe while drilling also includes a plurality of fixed keys, which are arranged at intervals along the axial direction of the inner cylinder on the outer wall of the inner cylinder; between two adjacent fixed keys, And the fixed keys located at both ends form intervals with the end caps at both ends respectively, and the support rings are respectively embedded in each interval to fix their positions sleeved on the outer wall of the inner cylinder.

The top of the outer cylinder is provided with a handle.

The bottom of the outer cylinder is provided with a plurality of bases.

In summary, the gamma scaler used for calibrating the gamma probe while drilling described in the utility model has a simple structure and is easy to use, and can effectively calibrate the sensitivity of the gamma probe before the formal detection while drilling. Guarantee its stability and accuracy while drilling.

Description of drawings

Fig. 1 is the structural representation of the gamma scale device for calibrating the gamma probe while drilling in the utility model;

Fig. 2 is a diagram of the usage state of the gamma scaler for calibrating the gamma probe while drilling in the present invention.

Detailed ways

A preferred embodiment of the present utility model will be described in detail below in conjunction with FIG. 1 and FIG. 2 .

As shown in Figure 1, the gamma scale for calibrating the gamma probe while drilling provided by the utility model includes: an outer cylinder 6 with openings at both ends and arranged horizontally; an inner cylinder 3 with openings at both ends and horizontal Sleeved inside the outer cylinder 6 and coaxially arranged with the outer cylinder 6; the outer diameter of the inner cylinder 3 is smaller than the inner diameter of the outer cylinder 6, so that the outer wall of the inner cylinder 3 and the inner wall of the outer cylinder 6 An annular space is formed between them; a plurality of support rings 4 are respectively sleeved on the outer wall of the inner cylinder 3 at intervals, and are located in the annular space between the inner cylinder 3 and the outer cylinder 6; a plurality of radioactive source rods 5, evenly distributed in a circumferential shape in the annular space between the inner cylinder 3 and the outer cylinder 6, used to simulate formation radioactivity; each radioactive source rod 5 passes through each support ring in sequence along the axial direction of the inner cylinder 3 4 is fixedly arranged on the support ring 4.

The radioactive source rod 5 is made of tungsten-thorium alloy.

As shown in Figure 2, the inner diameter of the inner cylinder 3 is larger than the outer diameter of the gamma probe 10 sleeved with a centralizer; the inner cylinder 3 of the gamma scale 20 is sleeved on the gamma probe 10, And it is located outside the sensor of the gamma probe 10 .

The gamma scale used for calibrating the gamma probe while drilling also includes a pad, which is used to set the inner cylinder 3 of the gamma scale 20 on the outside of the sensor of the gamma probe 10 . The clinging tile can be made of nylon material.

The gamma scale for calibrating the gamma probe while drilling also includes two ring-shaped end caps 2, which are respectively sleeved at the two ends on the outer wall of the inner cylinder 3 and connected with the outer cylinder 6, And use the nut 9 to lock, for connecting the inner cylinder 3 and the outer cylinder 6, and fixing the relative position between the inner cylinder 3 and the outer cylinder 6. That is, the end caps 2 are arranged at both ends of the annular space between the inner cylinder 3 and the outer cylinder 6, so that the annular space becomes a closed space.

The gamma scale for calibrating the gamma probe while drilling also includes a plurality of fixed keys 8, which are arranged at intervals along the axial direction of the inner cylinder 6 on the outer wall of the inner cylinder 6; two adjacent fixed keys 8, and between the fixed keys 8 at both ends and the end caps 2 at both ends respectively form intervals, and the support rings 4 are respectively embedded in each interval to fix the rings sleeved on the outer wall of the inner cylinder 6. Location. In the utility model, by adjusting the length of the fixed key 8 and the number of the fixed keys 8, the number of support rings required to be provided is correspondingly satisfied, and each support ring 4 can be sleeved at an appropriate position on the outer wall of the inner cylinder 6.

The top of the outer cylinder 6 is provided with a handle 1 for easy portability.

The bottom of the outer cylinder 6 is provided with a plurality of bases 7, so that the entire gamma scale can be placed stably.

The gamma scale for calibrating the gamma probe while drilling as described in this embodiment is provided with two fixed keys 8 on the outer wall of the inner cylinder 6, which are arranged at intervals along the axial direction of the inner cylinder 6, so that Spaces are formed between the two fixing keys and between the two fixing keys and the end caps 2 at both ends. Therefore, three supporting rings 4 are respectively sleeved at these three spaced positions. In addition, in this embodiment, a total of 12 radioactive source rods 5 made of tungsten thorium rods WT20 are arranged in total, which are uniformly distributed in a circular shape and arranged in the annular space between the inner cylinder 3 and the outer cylinder 6, for simulating formation radioactivity; A radioactive source rod 5 is 150 mm long and 4 mm in diameter, and passes through three support rings 4 sequentially along the axial direction of the inner cylinder 3 to be fixedly arranged on the support ring 4 .

At the drilling site, as shown in Figure 2, before the gamma probe 10 is installed into the drill collar, the gamma scaler 20 provided by the utility model needs to be set on the gamma probe 10, and the nylon The tiles fix the gamma scaler 20 outside the sensor of the gamma probe 10 . Open the gamma scale 20 to measure the reading of the gamma probe 10, and determine whether the sensitivity of the gamma probe 10 varies with the outside world by comparing the reading of the gamma probe 10 with the calibration value of the gamma scale 20. If there is a change due to the influence of factors, it has exceeded the permitted range of the index. If it is, the setting of the gamma probe 10 needs to be readjusted, so as to ensure its stability and accuracy during the subsequent detection while drilling.

In summary, the gamma scaler used for calibrating the gamma probe while drilling described in the utility model has a simple structure and is easy to use, and can effectively calibrate the sensitivity of the gamma probe before the formal detection while drilling. Ensure the stability and accuracy of the gamma probe while drilling and avoid the influence of various external factors on the measurement of the gamma probe.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions of the present utility model will be obvious to those skilled in the art after reading the above content. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims (8)

1. A gamma scaler for calibrating while drilling gamma probe, is characterized in that, comprises: The outer cylinder (6) is open at both ends and arranged horizontally; The inner cylinder (3), with openings at both ends, is horizontally sleeved inside the outer cylinder (6) and coaxially arranged with the outer cylinder (6); the outer diameter of the inner cylinder (3) is smaller than that of the outer cylinder (6), an annular space is formed between the outer wall of the inner cylinder (3) and the inner wall of the outer cylinder (6); A plurality of support rings (4) are respectively sleeved on the outer wall of the inner cylinder (3) at intervals, and are located in the annular space between the inner cylinder (3) and the outer cylinder (6); A plurality of radioactive source rods (5) are evenly distributed in a circumferential shape in the annular space between the inner cylinder (3) and the outer cylinder (6) to simulate formation radioactivity; each radioactive source rod (5) is arranged along the inner The axial direction of the cylinder (3) passes through each support ring (4) in order to be fixedly arranged on the support ring (4). 2. The gamma scaler for calibrating the gamma probe while drilling according to claim 1, characterized in that the radioactive source rod (5) is made of tungsten-thorium alloy. 3. The gamma scaler for calibrating the gamma probe while drilling as claimed in claim 1, characterized in that the inner diameter of the inner cylinder (3) is larger than the gamma probe ( 10); the inner cylinder (3) of the gamma scale (20) is sleeved on the gamma probe (10), and is located outside the sensor of the gamma probe (10). 4. the gamma scale device for calibrating the gamma probe while drilling as claimed in claim 3, characterized in that, the gamma scale device for calibrating the gamma probe while drilling also comprises a holding tile, It is used for fixing the inner cylinder (3) of the gamma scale (20) on the outside of the sensor of the gamma probe (10). 5. the gamma scale device for calibrating gamma probe while drilling as claimed in claim 1, characterized in that, the gamma scale device for calibrating gamma probe while drilling also includes two The ring-shaped end caps (2) are respectively set on the two ends of the outer wall of the inner cylinder (3), and are connected with the outer cylinder (6), and are locked by nuts (9) for connecting the inner cylinder (3) ) and the outer cylinder (6), fixing the relative position between the inner cylinder (3) and the outer cylinder (6). 6. the gamma scaler for calibrating gamma probe while drilling as claimed in claim 5, characterized in that, the gamma scale for calibrating gamma probe while drilling also includes a plurality of fixed The keys (8) are arranged at intervals along the axial direction of the inner cylinder (6) on the outer wall of the inner cylinder (6); between two adjacent fixed keys (8), and the fixed keys (8) at both ends are respectively Spaces are formed between the end caps (2) at both ends, and the support rings (4) are respectively embedded in each space to fix their positions sleeved on the outer wall of the inner cylinder (6). 7. The gamma scaler for calibrating the gamma probe while drilling according to claim 1, characterized in that, the top of the outer cylinder (6) is provided with a handle (1). 8. The gamma scaler for calibrating the gamma probe while drilling according to claim 1, characterized in that, the bottom of the outer cylinder (6) is provided with a plurality of bases (7).