Tension test device for running casing

Abstract

The utility model discloses a lower casing tension test device, which belongs to the technical field of test equipment, solves the problems of insufficient stability and more errors of a lower casing tension test, and comprises a test rack, one end part of the test rack is connected with a tension oil cylinder, the tension oil cylinder is connected with an oil cylinder connector, and the oil cylinder connector is connected with an oil cylinder. The oil cylinder connector is connected with a sliding seat, the sliding seat is connected with the test rack in a sliding manner, the sliding seat is connected with one end of a casing running device, the other end of the casing running device is connected with a casing connecting seat, the casing connecting seat is connected with a fixed seat, and the fixed seat is fixedly connected with the test rack. The test method comprises the steps of test rack installation, casing running device installation, graded pressurization, pressure relief inspection and the like. The torque test device is used for performing torque test on the casing running device of the drilling operation equipment, and has the characteristics of high stability and low error.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling operation equipment, and in particular relates to a casing tension test device. Background Art

[0002] The casing running device is a tool used for casing running based on the top drive during drilling operations. The casing running device has become a hotspot for domestic and foreign oil companies to develop due to its high success rate and high efficiency in deep well, ultra-deep well and horizontal well operations. The casing running device should be subjected to a torque test before leaving the factory.

[0003] At present, in the casing tension test, the tension required to simulate the working conditions is very large, so as to test whether the casing device can work stably under high pressure. As a result, the overall structural strength requirements of the test device are high, and the test is prone to instability, which affects the test results. There are also many operational errors in the test method, and a more reasonable test process needs to be designed. Utility Model Content

[0004] The purpose of the utility model is to:

[0005] In order to solve the problems of insufficient stability and many errors in the casing tension test in the prior art, a casing tension test device is provided.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A casing lowering tension test device comprises a test frame, one end of the test frame is connected to a tension cylinder, the tension cylinder is connected to a cylinder connecting head, the cylinder connecting head is connected to a sliding seat, the sliding seat and the test frame are slidably connected, the sliding seat is connected to one end of a casing lowering device, the other end of the casing lowering device is connected to a casing connecting seat, the casing connecting seat is connected to a fixed seat, and the fixed seat and the test frame are fixedly connected.

[0008] Furthermore, a traction head is connected between the casing lowering device and the sliding seat, and two slots for connecting the oil cylinder connecting head and the traction head are respectively provided on both sides of the sliding seat, and the traction head is threadedly connected to the top of the casing lowering device.

[0009] Furthermore, a stud and a nut are connected between the tension cylinder and the test frame, and the cylinder connecting head is threadedly connected to the tension cylinder.

[0010] Furthermore, a pin is connected between the fixing seat and the test frame.

[0011] A casing lowering tension test method is performed using the above casing lowering tension test device, comprising the following steps:

[0012] Step 1: Install the tension cylinder, cylinder connector, sliding seat, pin and fixed seat on the test frame, tighten the traction head and the front end of the casing lowering device, and insert the casing connector into the tail of the casing lowering device;

[0013] Step 2: Move the sliding seat to the installation position, and install the traction seat and the sleeve connecting seat into the card slots of the sliding seat and the fixed seat;

[0014] Step 3: Connect the hydraulic pipelines of the tension cylinder and the main cylinder of the casing lowering device;

[0015] Step 4: Supply oil to the top cylinder of the casing lowering device to 10MPa, so that the thread plate in the casing lowering device locks the casing traction head;

[0016] Step 5: Mark the overlapping positions of the casing lowering device and the casing pulling head with colors, and attach strain gauges to the front and rear sleeves of the casing lowering device;

[0017] Step 6: Pressurize the rod chamber of the tension cylinder four times, to 4MPa, 8MPa, 12MPa and 16MPa respectively, so that the tension cylinder can provide 200 tons of tension; each level of pressure lasts for 10 minutes, and check whether the casing device and the casing connector slip;

[0018] Step 7: Release the pressure of the tension cylinder, and supply oil to the bottom cylinder of the casing lowering device, so that the thread plate of the casing lowering device and the casing connector are loosened;

[0019] Step 8: Depressurize the hydraulic system and remove the tension cylinder and the main cylinder pipeline of the casing lowering device;

[0020] Step 9: Remove the casing lowering device from the test stand; pull out the pin shaft and move the fixing seat backward to disengage the casing connector from the tail of the casing lowering device;

[0021] Step 10: Check whether the bite marks of the upper pressure plate of the casing are uniform; check the stress values ​​at the front and rear sleeves of the lower casing device;

[0022] Step 11: The test is completed.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0024] The test device of the utility model adopts a structure in which all components are on the same central axis, and realizes the tension bearing and tension guiding of the casing lowering device through the sliding connection between the sliding seat and the test frame. This structure enables the tension applied by the tension cylinder to always remain in a stable and precise direction without deviation, thereby accurately controlling the tension borne by the casing lowering device, improving the accuracy of the test, significantly improving the stability of the test, and reducing the test error.

[0025] The test method of the utility model, through multi-stage continuous pressurization, makes the pressure of the casing lowering device gradually increase to simulate the actual working condition, avoids the problem of sudden pressurization to the maximum which is inconsistent with the actual situation and the simulated working condition is unrealistic, effectively simulates the working condition that the casing lowering device is gradually obstructed when the lower pipe depth is gradually increased during drilling operation, and makes the test process more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall structure diagram of the utility model;

[0027] Figure 2 for Figure 1 A top view of

[0028] Figure 3 for Figure 1 Left view of;

[0029] Figure 4 for Figure 2 Sectional view in the AA direction;

[0030] Figure 5 It is a structural diagram of the tension cylinder of the utility model.

[0031] Markings in the figure: 1-tension cylinder, 2-cylinder connecting head, 3-sliding seat, 4-traction head, 5-casing lowering device, 6-casing connecting seat, 7-pin shaft, 8-fixed seat, 9-test frame. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0033] A casing lowering tension test device comprises a test frame 9, one end of which is connected to a tension cylinder 1, the tension cylinder 1 is connected to a cylinder connector 2, the cylinder connector 2 is connected to a sliding seat 3, the sliding seat 3 is slidably connected to the test frame 9, the sliding seat 3 is connected to one end of a casing lowering device 5, the other end of the casing lowering device 5 is connected to a casing connecting seat 6, the casing connecting seat 6 is connected to a fixed seat 8, and the fixed seat 8 is fixedly connected to the test frame 9.

[0034] A traction head 4 is connected between the casing lowering device 5 and the sliding seat 3 . Two slots for connecting the oil cylinder connecting head 2 and the traction head 4 are respectively arranged on both sides of the sliding seat 3 . The traction head 4 is threadedly connected to the top of the casing lowering device 5 .

[0035] A stud and a nut are connected between the tension cylinder 1 and the test frame 9 , and a cylinder connector 2 is threadedly connected to the tension cylinder 1 .

[0036] A pin shaft 7 is connected between the fixing seat 8 and the test frame 9 .

[0037] A casing lowering tension test method is performed using the above casing lowering tension test device, comprising the following steps:

[0038] Step 1: Install the tension cylinder 1, the cylinder connector 2, the sliding seat 3, the pin 7, and the fixed seat 8 on the test frame 9, tighten the traction head 4 and the front end of the casing device 5, and insert the casing connector 6 into the tail of the casing device 5;

[0039] Step 2: Move the sliding seat 3 to the installation position, and install the traction seat and the sleeve connecting seat 6 into the slots of the sliding seat 3 and the fixed seat 8;

[0040] Step 3: Connect the hydraulic pipelines of the tension cylinder 1 and the main cylinder of the casing lowering device 5;

[0041] Step 4: The oil cylinder at the top of the casing lowering device 5 is supplied with oil to 10 MPa, so that the thread plate in the casing lowering device 5 locks the casing traction head 4;

[0042] Step 5: Mark the overlapping positions of the casing lowering device 5 and the casing pulling head 4 with colors, and attach strain gauges to the front and rear sleeves of the casing lowering device 5;

[0043] Step 6: The rod chamber of the tension cylinder 1 is pressurized 4 times, to 4MPa, 8MPa, 12MPa and 16MPa respectively, so that the tension cylinder 1 provides 200 tons of tension; each level of pressure lasts for 10 minutes, and the casing device 5 is checked for slippage with the casing connector;

[0044] Step 7: The tension cylinder 1 is depressurized, and the bottom cylinder of the casing lowering device 5 is supplied with oil to loosen the thread plate of the casing lowering device 5 and the casing connector;

[0045] Step 8: Depressurize the hydraulic system and remove the tension cylinder 1 and the main cylinder pipelines of the casing lowering device 5;

[0046] Step 9: Remove the casing lowering device 5 from the test stand 9; pull out the pin 7 and move the fixing seat 8 backwards to disengage the casing connector from the tail of the casing lowering device 5;

[0047] Step 10: Check whether the bite marks of the upper sleeve pressure plate are uniform; check the stress values ​​at the front and rear sleeves of the lower sleeve device 5;

[0048] Step 11: The test is completed.

[0049] The 200-ton tension cylinder 1 is connected to the test frame 9 through studs and nuts.

[0050] One end of the oil cylinder connector 2 is connected to the 200-ton tension oil cylinder 1 by a thread. The other end is stuck in the groove of the sliding seat 3. When the oil cylinder has oil in the rod cavity, a pulling force is generated and acts on the sliding seat 3.

[0051] The sliding seat 3 has two front and rear slots, one end of which is connected to the oil cylinder connector 2 and the other end is connected to the traction head 4. It is used to transmit the pulling force generated by the oil cylinder.

[0052] One end of the traction head 4 is stuck in the groove of the sliding seat 3, and the other end is connected to the top of the casing device 5 through an NC50 thread.

[0053] The casing lowering device 5 is the test object of the test device. One end is connected to the traction head 4 through an NC50 thread, and the other end, when the oil cylinder of the casing lowering device 5 reaches a certain pressure, the thread plate of the casing lowering device 5 locks the casing connection seat 6.

[0054] One end of the sleeve connecting seat 6 is locked on the lower sleeve device 5 through a tooth plate, and the other end is clamped in the clamping groove of the fixing seat 8.

[0055] The fixing seat 8 is fixed on the test frame 9 through the pin shaft 7, and the pulling force generated at the front end is transmitted to the test frame 9 through the pin shaft 7.

[0056] The test frame 9 is connected with the oil cylinder by a stud, and the pulling force generated by the oil cylinder is transmitted to the test frame 9.

[0057] The implementation of the utility model can realize the simulation test of the following working conditions:

[0058] (1) When the casing running device 5 is subjected to the maximum tension during use, whether the main body cylinder, connecting device, thread plate and other components of the casing running device 5 can work stably.

[0059] (2) When the casing running device 5 is subjected to the maximum tensile force during use, whether the structural strength of the casing running device 5 meets the requirements.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A casing tension test device, characterized in that: The test frame (9) comprises a test frame (9), one end of which is connected to a tension cylinder (1), the tension cylinder (1) is connected to a cylinder connector (2), the cylinder connector (2) is connected to a sliding seat (3), the sliding seat (3) and the test frame (9) are slidably connected, the sliding seat (3) is connected to one end of a casing lowering device (5), the other end of the casing lowering device (5) is connected to a casing connecting seat (6), the casing connecting seat (6) is connected to a fixed seat (8), and the fixed seat (8) and the test frame (9) are fixedly connected.

2. A casing tension test device according to claim 1, characterized in that: A traction head (4) is connected between the casing lowering device (5) and the sliding seat (3), and two slots for connecting the oil cylinder connecting head (2) and the traction head (4) are respectively provided on both sides of the sliding seat (3), and the traction head (4) is threadedly connected to the top of the casing lowering device (5).

3. The casing tension test device according to claim 1, characterized in that: A stud bolt and a nut are connected between the tension cylinder (1) and the test frame (9), and the cylinder connecting head (2) is threadedly connected to the tension cylinder (1).

4. The casing tension test device according to claim 1, characterized in that: A pin shaft (7) is connected between the fixing seat (8) and the test frame (9).

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