CN202991008U - Dynamometric device for simulating mechanical characteristic of bottom-hole assembly - Google Patents

Abstract

The utility model relates to a dynamometric device for simulating a mechanical characteristic of a bottom-hole assembly. The dynamometric device mainly comprises a mounting seat, a dynamometric ring, strain sheets, three elastic sheets, a simulated drill collar, a simulated drill bit, a tension-compression sensor pressure rod, fastening bolts, washers, gaskets, a fastening nut, a tension-compression sensor and a base, wherein the simulated drill collar is in threaded connection with the simulated drill bit; an axis of the simulated drill collar coincides with that of the mounting seat; the dynamometric ring is embedded into the mounting seat; the elastic sheets are mounted on an inner circle of the dynamometric ring at 120-degree intervals in a grooving manner; the strain sheets are clung to the two sides of the elastic sheets to form a bridge-type dynamometric sensor connected by half bridges; the fastening bolts fix the elastic sheets, the washers and the gaskets on the dynamometric ring to measure a lateral force of the simulated drill bit; and the tension-compression sensor pressure rod is mounted on the tension-compression sensor, and fastened by the fastening nut to measure axial pressure of the simulated drill bit. The dynamometric device can measure the axial pressure and the lateral force at the simulated drill bit, and provides a basis for improving a design of the bottom-hole assembly and raising a control level of a well track.

Description

A force measuring device for simulating mechanical properties of bottom hole assembly

technical field

The utility model relates to a force measuring device for simulating the mechanical characteristics of a bottom drilling tool assembly, which belongs to the technical field of pipe string dynamics testing. the

Background technique

In the process of petroleum exploration and development, drilling is an essential and basic link, which is characterized by capital and technology-intensive. The study of drill string mechanical properties is an important part of modern drilling engineering theory and technology. With the development of drilling technology in the direction of high temperature and high pressure wells, deep wells and ultra-deep wells, special process wells (including directional wells, horizontal wells, extended reach wells, complex structure wells, cluster wells, underbalanced drilling and casing drilling, etc.), the Pipe string mechanics, especially the research on the mechanical properties of the BHA puts forward higher requirements, and it is necessary to further grasp the mechanism of BHA anti-deviation and straightening. the

Many scholars at home and abroad have carried out a lot of theoretical research on the mechanics of the bottom hole assembly, and achieved a lot of results through the establishment of ideal models and theoretical calculations. For example, since A. Lubinski systematically and comprehensively studied the force and deformation of the drill string in a vertical well in 1950, creating a new situation in the study of drill string mechanics, B.H. Walker’s energy method, W.B. Bradley and F.J. Fischer's differential method, Bai Jiazhi's vertical and horizontal bending method, K.K.Millheim's finite element method, Godly's weighted margin method, Di Qinfeng's pre-bending dynamics anti-deviation and fast drilling tool assembly dynamics model, etc., but only from It is incomplete to understand and analyze the dynamic characteristics of the bottom drill string from a theoretical point of view. With the development of measurement-while-drilling technology, foreign countries have carried out experimental research on the force and motion characteristics of the bottom drill string by using methods such as cable transmission, downhole storage, ground measurement based on the bottom drill string dynamic model and indoor simulation measurement. and on-site measurement have achieved great development (refer to: US4324297, US4445578, US4662458, US4958517), but there are still disadvantages such as difficulty and high economic cost, and at present in China, the on-site measurement of BHA dynamic characteristics is still not very good, and there is a lack of advanced Surface and downhole measurement systems, therefore, it is necessary to further carry out indoor simulation research on the mechanical properties of the bottom hole assembly at this stage. the

Contents of this utility model

The purpose of this utility model is, in order to overcome the above-mentioned existing technical problems and deficiencies, and further improve the research level of the indoor experiment to simulate the mechanical properties of the BHA, and to provide a force measuring device for simulating the mechanical properties of the BHA . the

The technical scheme adopted by the utility model to achieve its purpose is: a force measuring device for simulating the mechanical characteristics of the bottom drilling tool assembly, which mainly consists of a mounting base 1, a force measuring ring 2, a strain gauge 3, an elastic plate 4, a simulation drill Collar 5, simulated drill bit 6, tension and pressure sensor pressure rod 7, elastic sheet fastening bolt 8, elastic sheet fastening bolt washer 9, elastic sheet gasket 10, tension and pressure sensor pressure rod fastening bolt 11, tension and pressure sensor 12, The base 13, the force measuring ring fastening bolt 14, and the tension and pressure sensor fastening bolt 15 are formed. The simulated drill collar 5 is screwed to the simulated drill bit 6, and its axis coincides with the axis of the mounting seat 1; the force measuring ring 2 is embedded in the mounting seat 1, and three slits of 120° are cut on the inner circle of the force measuring ring 2 to install the elastic sheet 4. The elastic sheet 4 is fixed on the force measuring ring 2 by the elastic sheet fastening bolt 8, and the diameter of the circle surrounded by the three elastic sheets 4 is equal to the diameter of the simulated drill bit 6, so as to ensure that the three elastic sheets 4 and the simulated drill bit 6 are in the same position. Contact in the initial state; different lateral forces of the simulated drill bit 6 can be measured by changing the thickness of the elastic sheet 4, and an elastic sheet gasket 10 of appropriate thickness is selected to ensure that the diameter of the inscribed circle surrounded by the three elastic sheets 4 is equal to the simulated The diameter of the drill bit 6, the force measuring ring fastening bolts 14 are distributed at 180° to fix the force measuring ring 2; preferably, the strain gauges 3 are attached to the two sides of the elastic sheet 4 to form a half-bridge connected strain gauge load cell; preferably , tension and pressure sensor pressure rod 7 is installed on the tension and pressure sensor 12, the top is in contact with the top of the simulated drill bit 6 to measure the axial pressure of the simulated drill bit 6, the tension and pressure sensor pressure rod fastening bolt 11 tightens the tension and pressure sensor pressure rod 7 To eliminate the threaded gap between the tension and pressure sensor pressure rod 7 and the tension and pressure sensor 12; the base 13 constrains the axial displacement of the tension and pressure sensor 12; lateral displacement. the

Compared with the prior art, the utility model has the following beneficial effects: (1) it can continuously and dynamically measure the axial pressure and lateral force of the simulated drill bit accurately; (2) it has a simple structure, is convenient to manufacture, and is easy to measure Simulated drill bits of different diameters and their lateral forces at different size ranges. Therefore, it provides effective measurement data for indoor research on the mechanical properties of the simulated BHA, and further improves the research level of the mechanical properties of the BHA. the

Description of drawings

Figure 1 is an assembly diagram of the force measuring device used to simulate the mechanical properties of the bottom hole assembly. the

FIG. 2 is a cross-sectional view along line A of FIG. 1 . the

FIG. 3 is a cross-sectional view taken along direction B of FIG. 1 . the

Fig. 4a is a front view of an assembly diagram of an elastic plate and a strain gauge of a force measuring device used for simulating the mechanical properties of the bottom hole assembly. the

Fig. 4b is a top view of an assembly drawing of elastic sheets and strain gauges of the force measuring device used to simulate the mechanical properties of the bottom hole assembly. the

Figure 5 is a flowchart for measuring simulated bit lateral force and axial pressure. the

In the figure: 1. Mounting seat, 2. Force measuring ring, 3. Strain gauge, 4. Elastic sheet, 5. Simulated drill collar, 6. Simulated drill bit, 7. Compression rod of tension and pressure sensor, 8. Fastening bolt of elastic sheet , 9. Elastic sheet fastening bolt washer, 10. Elastic sheet gasket, 11. Tension and pressure sensor pressure rod fastening bolt, 12. Tension and pressure sensor, 13. Base, 14. Force measuring ring fastening bolt, 15. Pull Pressure sensor fastening bolts. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described. the

As shown in Fig. 1, Fig. 2 and Fig. 3, the utility model is a force measuring device for simulating the mechanical characteristics of the bottom drilling tool assembly, which mainly consists of a mounting base 1, a force measuring ring 2, a strain gauge 3, and an elastic plate 4 , Tension and pressure sensor compression rod 7, elastic sheet fastening bolt 8, elastic sheet fastening bolt washer 9, elastic sheet gasket 10, tension and compression sensor compression rod fastening bolt 11, tension and compression sensor 12, base 13, measuring Force ring fastening bolt 14, tension and pressure sensor fastening bolt 15 constitute, and wherein elastic sheet 4 is processed and made with spring steel. the

The installation and connection relationship of each component is as follows: the simulated drill collar 5 and the simulated drill bit 6 are threaded to form a simulated BHA. The mounting seat 1 of the device is clamped and fixed by the fixture; the force-measuring ring 2 is embedded in the mounting seat 1, and three slits of 120° are cut on the inner circle of the force-measuring ring 2 to install the elastic sheet 4; as shown in Figure 4a and Figure 4b , the strain gauge 3 is pasted on both sides of the elastic piece 4 to form a strain gauge load cell connected by a half bridge; The diameter of the cut circle is equal to the diameter of the simulated drill bit 6, to ensure that the three elastic sheets 4 are in contact with the simulated drill bit 6 in the initial state, forming a lateral force sensor for measuring the lateral force of the simulated drill bit 6; by changing the thickness of the elastic sheet 4 The different lateral forces of the simulated drill bit 6 can be measured, and an elastic sheet gasket 10 of suitable thickness is selected to ensure that the diameter of the inscribed circle surrounded by the three elastic sheets 4 is equal to the diameter of the simulated drill bit 6; the force measuring ring fastens the bolt 14 180° distribution between phases to fix the force measuring ring 2. the

The tension and pressure sensor 12 is the LC1102 strain type tension and pressure sensor produced by Beijing Andy Century Electronics Co., Ltd., which has been calibrated when leaving the factory; The axial pressure of the simulated drill bit 6 is measured, and the tension-compression sensor compression rod fastening bolt 11 tightens the tension-compression sensor compression rod 7 to eliminate the threaded gap between the tension-compression sensor compression rod 7 and the tension-compression sensor 12 . the

The base 13 constrains the axial displacement of the tension-compression sensor 12; the

The working process of the utility model is: paste the strain gauge 3 on the front and back sides of the elastic sheet 4, and then fix three same elastic sheets 4 on the force measuring ring 2 by the elastic sheet fastening bolts 8 at an interval of 120° to form a Lateral force sensor; As shown in Figure 5, the lateral force sensor is calibrated before use to obtain the corresponding relationship between force and strain; the lateral force sensor and tension-compression sensor 12 are installed on the mounting base 1 and tested on the test bench The clamps are clamped and fixed; the lateral force sensor, the tension and pressure sensor 12 and the signal acquisition module and the computer are connected together through the signal cable; the simulated wellbore and the simulated drill string are clamped on the test bench; the loading system of the test bench is The simulated drill string is loaded with a certain rotational speed and axial pressure; at this time, the signal acquisition module collects the signal according to the set acquisition frequency and stores it in the computer. After the test is completed, the recorded data is read, and then according to the calibration data The data is converted to obtain the axial force and lateral force of the drill bit. the

The utility model can measure the dynamically changing axial pressure and lateral force at the simulated drill bit when simulating the rotation of the bottom drilling tool assembly, improve the research level of the mechanical properties of the bottom drilling tool assembly, further improve the design of the bottom drilling tool assembly and improve the trajectory of the borehole The level of control, thereby reducing the number of trips, shortening the drilling cycle, and reducing drilling costs. the

Claims (3)

1. device for measuring force that is used for simulation Bottom Hole Assembly (BHA) mechanical characteristic, mainly by mount pad (1), proving ring (2), foil gauge (3), flexure strip (4), simulation drill collar (5), simulation drill bit (6), tension-compression sensor depression bar (7), flexure strip fastening bolt (8), flexure strip fastening bolt packing ring (9), flexure strip pad (10), tension-compression sensor depression bar fastening bolt (11), tension-compression sensor (12), base (13), proving ring fastening bolt (14), tension-compression sensor fastening bolt (15) consists of, it is characterized in that: simulation drill collar (5) is threaded with simulation drill bit (6), the dead in line of its axis and mount pad (1), proving ring (2) embeds mount pad (1), cut the cutter groove of 3 alternate 120 ° on proving ring (2) inner circle flexure strip (4) is installed, flexure strip (4) is fixed on proving ring (2) by flexure strip fastening bolt (8), the inscribe diameter of a circle that 3 flexure strips (4) surround equals to simulate the diameter of drill bit (6), contacts under original state with simulation drill bit (6) to guarantee 3 flexure strips (4), thickness by changing flexure strip (4) can measure analog drill bit (6) different lateral forces, and the flexure strip pad (10) of selecting suitable thickness equals to simulate the diameter of drill bit (6) to guarantee diameter of a circle that 3 flexure strips (4) surround, the alternate 180 ° of distributions of proving ring fastening bolt (14) are with fixing proving ring (2).

2. device for measuring force as claimed in claim 1 is characterized in that: foil gauge (3) is attached to the strain-type force sensor that the two sides of flexure strip (4) connects to consist of half-bridge.

3. device for measuring force as claimed in claim 1, it is characterized in that: tension-compression sensor depression bar (7) is arranged on tension-compression sensor (12), the top contact axial compression with measure analog drill bit (6) with the top of simulation drill bit (6), and tension-compression sensor depression bar fastening bolt (11) tightens up the gap of tension-compression sensor depression bar (7) to be threaded between elimination tension-compression sensor depression bar (7) and tension-compression sensor (12); The axial displacement of base (13) constraint tension-compression sensor (12); The alternate 180 ° of distributions of tension-compression sensor fastening bolt (15) are with the lateral displacement of constraint tension-compression sensor (12).

Images