Rock torsion impact test device

Abstract

A rock torsion impact test device includes a multifunctional testing machine faucet center tube, a multifunctional testing machine faucet center tube threadedly connected to the top of the center tube joint, a through-hole brush slip ring externally mounted on the upper end, and a lower end connected to an upper joint, the other end of the upper joint being threadedly connected to a lower joint; and the lower joint is connected to the electric cylinder base as a whole through a connector mounted on its periphery, and the connector is connected to the lower joint through a double key to achieve impact torque load transmission; a bearing plate is fixedly connected to the center line of the electric cylinder base; the electric cylinders are symmetrically mounted on both sides of the bearing plate on the electric cylinder base, and the impact head of the electric cylinder impacts the bearing plate; the through-hole brush slip ring is connected to the electric cylinder to transmit power electricity and control signals. The structure of the present invention is reasonable and compact, and it can well simulate the working characteristics and parameter changes of downhole torsion impact tools, and meet the needs of downhole torsion impact tool simulation tests in oil drilling.

Description

Technical Field

[0001] The invention belongs to the field of oil drilling and production industry, and specifically relates to a rock torsion impact generation test device in an oil drilling and production downhole tool test system. Technical Background

[0002] With the rapid consumption of conventional oil and gas resources, the exploration and development of deep and ultra-deep oil and gas fields has become more difficult and costly. In order to meet the increasing demand for oil and gas energy year by year, major oil fields have achieved increased production and efficiency in oil and gas field exploitation by developing new downhole tools. There are many types of oil and gas downhole tools, and the market demand is huge, but what they have in common is that they work several thousand meters underground, and are in a harsh working environment of high temperature and high pressure for a long time. If a fault occurs during the working process, it cannot be repaired in the well, and it is difficult to judge, analyze and determine the cause of the fault. They can only be taken out of the well for maintenance from several thousand meters, wasting time, consuming costs, reducing production efficiency, and invisibly increasing the development cost of oil and gas fields. Therefore, it is of great significance to carry out the research and development of downhole tools and processes for oil drilling and production. Product and process research and development are closely related to experimental testing. The research of experimental equipment should be ahead to provide strong technical support for product and process research and development.

[0003] In the domestic oil drilling industry, there is a big gap between downhole tools and process technologies and those of foreign companies. Foreign companies only rent but do not buy advanced downhole tools, implementing a technical blockade. To improve the technical level of the domestic industry and develop advanced and efficient downhole tool products with independent intellectual property rights, advanced and reliable testing methods are needed. Summary of the invention

[0004] The present invention provides a test device capable of generating a torsional impact load. The test device is connected to the faucet center pipe of an original multifunctional testing machine, and can meet the test needs of applying an additional torsional impact load when a drilling bit drills into rock in a simulated test well in an indoor test laboratory, and can truly simulate the working conditions of a downhole torsional impact tool installed in oil and gas drilling.

[0005] The technical solution adopted by the present invention is:

[0006] A rock torsion impact test device comprises a multifunctional testing machine faucet center tube, the top of the center tube joint is threadedly connected to the multifunctional testing machine faucet center tube, the upper end is externally sleeved with a through-hole brush slip ring, the lower end is connected to an upper joint, and the other end of the upper joint is threadedly connected to a lower joint; the lower joint is connected to an electric cylinder base as a whole through a connecting piece sleeved on its periphery, and the connecting piece is connected to the lower joint through a double key to realize the transmission of impact torque load; a bearing plate is fixedly connected to the center line of the electric cylinder base; electric cylinders are symmetrically installed on both sides of the bearing plate on the electric cylinder base, and the impact head of the electric cylinder impacts the bearing plate; the through-hole brush slip ring is connected to the electric cylinder to transmit power electricity and control signals.

[0007] The upper joint and the center pipe joint are connected by a snap-fit ​​structure, specifically: the convex wing head on the outer periphery of the lower part of the center pipe joint is inserted into the corresponding arc notch on the end face of the upper joint, and the bottom of the arc notch is processed with a radial annular groove. The center pipe joint is rotated to make its convex wing head enter the annular groove. At this time, a block is placed in the arc notch and fixed with a pin to complete the positioning connection of the center pipe joint.

[0008] An impact force sensor is installed on the impact head of the electric cylinder, and a displacement sensor is installed between the electric cylinder housing and the electric cylinder impact head.

[0009] The present invention is mainly used in oil drilling tool laboratories to simulate the working state of a downhole torsion impact tool when it is connected to the upper part of a drill bit to drill into rock. The present invention is connected and installed on the central tube of a two-way faucet of an original multifunctional testing machine. Its main purpose is to study the influence of the installation of a downhole torsion impact tool on the drilling speed of the drill bit when the drill bit is drilling in formation rock, the effect of changes in parameters such as additional impact frequency and impact force generated by the device on the drill bit breaking different types of formation rocks, and to study the laws of breaking rocks, so as to provide reliable theoretical support for the optimal design of new downhole torsion impact tools and the optimization of drilling process parameters.

[0010] The invention has a reasonable and compact structure, can well simulate the working characteristics and parameter changes of the downhole torsion impact tool, and meets the needs of the simulation test of the downhole torsion impact tool in oil drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The front view of the device of the present invention;

[0012] Figure 2 for Figure 1 Middle AA cross-section diagram;

[0013] Figure 3 for Figure 1 Middle BB cross-section diagram. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings.

[0015] Reference Figure 1 , Figure 2A rock torsion impact test device includes a multifunctional testing machine faucet center tube 8, a center tube joint 2 with a threaded connection to the multifunctional testing machine faucet center tube 8 at the top, a through-hole brush slip ring 1 on the upper end, and a lower end connected to an upper joint 3, the other end of the upper joint 3 is threadedly connected to a lower joint 6; and the lower joint 6 is connected to the electric cylinder base 5 as a whole through a connector mounted on its periphery, and the connector is connected to the lower joint 6 through a double key to achieve torque load transmission; a bearing plate 7 is fixed on the center line of the electric cylinder base 5; the electric cylinder 4 is symmetrically installed on both sides of the bearing plate 7 on the electric cylinder base 5, and the impact head 10 of the electric cylinder impacts the bearing block 7 alternately; the through-hole brush slip ring 1 is connected to the electric cylinder 4, and the power cable and measurement and control signal line on the through-hole brush slip ring 1 are connected to an external electric control measurement and control system. The purpose of applying additional torsional impact load when the original multifunctional testing machine center tube faucet 8 drives the drill bit to rotate and drill into the rock is achieved.

[0016] Reference Figure 3 The upper joint 3 and the center pipe joint 2 are connected by a snap-fit ​​structure, specifically: the convex wing head on the outer periphery of the lower part of the center pipe joint 2 is inserted into the matching arc notch on the end face of the upper joint 3. The bottom of the arc notch is processed with a radial annular groove. The center pipe joint 2 is rotated by a certain angle (0-90︒) to make its convex wing head enter the annular groove. At this time, the stopper 13 is inserted into the arc notch and pushed into the annular groove. The pin 14 is inserted into the circular hole on the bottom surface of the annular groove to fix the stopper 13 to prevent the convex wing head of the lower part of the center pipe joint 2 from rotating and slipping out, ensuring reliable transmission of the test torque. At this time, the rotation torque and tensile / compressive load can be transmitted between the upper joint 3 and the center pipe joint 2; when disassembling, the center pipe joint 2 is rotated in the opposite direction at the same angle to reach the arc notch of the upper joint 3 and lift it up to exit.

[0017] An impact force sensor 11 is installed on the impact head 10 of the electric cylinder, and a displacement sensor 12 is installed between the housing of the electric cylinder 4 and the impact head 10 of the electric cylinder. The technical indicators that can be achieved during loading are: impact force 0-1900N.m, frequency 17-40Hz, and impact torque 0-1200N.m.

[0018] The upper end of the present invention is connected to the original multifunctional testing machine faucet center tube through a center tube joint, and the lower end is connected to the wellbore drilling drill rod through a lower joint. The lower part of the drill rod is connected to the drill bit, and the whole is lowered into the simulated rock sample well for drilling. The present invention adopts four electric cylinders to apply torsional impact loads. The electric cylinder is used as an actuator for torsional impact. The impact head on the electric cylinder is used to diagonally and synchronously alternately impact the bearing plate fixed on the electric cylinder base. The distance between the two cylinders is a force arm to generate an impact torque. Since the electric cylinder base is integrally connected to the original multifunctional testing machine faucet center tube, the torsional impact load is synchronously transmitted to the drill bit drilling into the rock. The electric cylinder impact head is equipped with an impact force sensor. The ground control station can accurately control and precisely measure the impact force, impact frequency, and amplitude of the electric cylinder impact head through the control system control software, and can indirectly measure the impact acceleration and impact torque.

[0019] The through-hole brush slip ring 1 is an electrical component that transmits electric energy and measures control signals to four electric cylinders 4 fixed on an electric cylinder base 5 through power cables and signal lines thereon.

Claims

1. A rock torsion impact test device, comprising a multifunctional testing machine faucet center tube, characterized in that: The top of the center pipe joint (2) is threadedly connected to the center pipe (8) of the multifunctional testing machine faucet, the upper end is externally sleeved with a through-hole brush slip ring (1), and the lower end is connected to the upper joint (3), and the other end of the upper joint (3) is threadedly connected to the lower joint (6); the lower joint (6) is connected to the electric cylinder base (5) as a whole through a connecting piece sleeved on its outer periphery, and the lower end of the lower joint is connected to the wellbore drilling drill pipe; the connecting piece is connected to the lower joint (6) through a double key to realize the transmission of impact torque load; the bearing plate (7) is fixedly connected to the center line of the electric cylinder base (5); the electric cylinder (4) is symmetrically installed on both sides of the bearing plate (7) on the electric cylinder base (5), and the impact head (10) of the electric cylinder alternately impacts the bearing plate (7); the through-hole brush slip ring (1) and the electric cylinder (4) are connected to transmit power electricity and control signals.

2. The rock torsion impact test device according to claim 1, characterized in that: The upper joint (3) and the central pipe joint (2) are connected by a snap-fit ​​structure, specifically: a convex wing head on the outer periphery of the lower part of the central pipe joint (2) is inserted into a matching arc notch on the end face of the upper joint (3), the bottom of the arc notch is processed with a radial annular groove, and the central pipe joint (2) is rotated so that its convex wing head enters the annular groove. At this time, a stopper (13) is placed in the arc notch and fixedly connected with a pin shaft (14) to complete the positioning connection of the central pipe joint (2).

3. The rock torsion impact test device according to claim 1, characterized in that: An impact force sensor (11) is installed on the impact head (10) of the electric cylinder, and a displacement sensor (12) is installed between the housing of the electric cylinder (4) and the impact head (10).

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