CN-224228635-U - Hydraulic self-triggering pressure-maintaining coring tool

CN224228635UCN 224228635 UCN224228635 UCN 224228635UCN-224228635-U

Abstract

The utility model relates to the technical field of drilling coring, and discloses a hydraulic self-triggering pressure-maintaining coring tool, which comprises a shell, wherein a piston tube, a cylinder barrel, a coring barrel and a pressure-maintaining controller are coaxially arranged in the shell, one end of the piston tube is fixedly connected with the rear end of the shell, the other end of the piston tube is fixedly provided with a piston, the piston is slidably arranged in the cylinder barrel, the rear end of the cylinder barrel is slidably matched with the piston tube, the front end of the cylinder barrel is rotatably connected with one end of the coring barrel, the other end of the coring barrel is matched with the pressure-maintaining controller, the inner cavity of the piston tube, the inner cavity of the piston and a rodless cavity are sequentially communicated, the front end of the cylinder barrel is provided with a penetrating flow passage, the piston tube is provided with a pressurizing hole, the two ends of the pressurizing hole are respectively communicated with the inner cavity of the piston tube and a rod cavity, a ball seat is processed in the piston, a sealing ball can be put into the piston cavity, the piston seat can be plugged, the front end of the coring barrel can be sealed when coring is completed, and an in-situ environment is ensured when the coring tool is taken out.

Inventors

WANG XUAN
Yang Bengao
YANG LEI
HAO HAICHUN
He Kunchen
ZHOU XUEMIN
Yang Zundong
WANG YUNLONG
TANG RUIFENG

Assignees

深圳大学
四川大学

Dates

Publication Date: 20260512
Application Date: 20250826

Claims (6)

1. The hydraulic self-triggering pressure-maintaining coring tool comprises a shell, wherein the front end of the shell is fixedly connected with a coring bit, a coring barrel is coaxially arranged in the shell and positioned at the rear end of the coring bit, and is characterized in that, The novel self-locking type self-locking device is characterized in that a piston tube, a cylinder barrel and a pressure maintaining controller are coaxially arranged in the shell, one end of the piston tube is fixedly connected with the rear end of the shell, a piston is fixedly arranged at the other end of the piston tube, the piston is slidably arranged in the cylinder barrel, the cylinder barrel is slidably matched with the shell, the rear end of the cylinder barrel is slidably matched with the piston tube, one end of the coring barrel is closed, the front end of the cylinder barrel is rotatably connected with the closed end of the coring barrel, and the other end of the coring barrel is matched with the pressure maintaining controller; The piston divides the interior of the cylinder barrel into a rod cavity and a rodless cavity, the piston is of a hollow structure, the inner cavity of the piston tube, the inner cavity of the piston and the rodless cavity are sequentially communicated, a penetrating flow passage is formed in the front end of the cylinder barrel, one end of the penetrating flow passage is communicated with the rodless cavity, an annular cavity is formed by the outer wall of the coring barrel and the inner wall of the shell, and the other end of the penetrating flow passage is communicated with the annular cavity; The piston tube is provided with a pressurizing hole near the piston, two ends of the pressurizing hole are respectively communicated with the inner cavity and the rod cavity of the piston tube, a ball seat is arranged in the piston, the sealing ball can be thrown into the ball seat through the inner cavity of the piston tube, and the sealing ball can be used for plugging the inner cavity of the piston.
2. The hydraulic self-triggering pressure maintaining coring tool as set forth in claim 1, wherein the rear end of the housing is fixedly provided with a first clamping joint, the rear end of the cylinder barrel is fixedly provided with a second clamping joint, and the first clamping joint and the second clamping joint can be connected when being closed.
3. The hydraulic self-triggering pressure maintaining coring tool as set forth in claim 2, wherein a plurality of claws are uniformly distributed on the circumference of one end of the first clamping connector, which is close to the cylinder, and a frustum is processed on one end of the second clamping connector, which is close to the first clamping connector, and the frustum is matched with the claws.
4. The hydraulic self-triggering pressure maintaining coring tool as set forth in claim 1, wherein a plurality of said through flow passages are circumferentially and uniformly distributed.
5. The hydraulic self-triggering pressure maintaining coring tool according to claim 4, wherein the through flow passage is obliquely arranged, one end of the through flow passage far away from the coring barrel is arranged at a position close to the axis of the cylinder barrel, and the other end of the through flow passage is arranged at a position far away from the axis of the cylinder barrel.
6. The hydraulic self-triggering pressure maintaining coring tool according to claim 1, wherein a check sleeve is fixedly arranged in the coring barrel, a plurality of ratchet bars are uniformly distributed on the inner circumference of the check sleeve, and the ratchet bars are configured to enable the core and the check sleeve to move only in a mutual approaching direction.

Description

Hydraulic self-triggering pressure-maintaining coring tool Technical Field The utility model relates to the technical field of drilling coring, in particular to a hydraulic self-triggering pressure-maintaining coring tool. Background Drilling coring is one of the most intuitive modes in deep resource exploration, and the basic principle is to drill a core in a deep reservoir occurrence environment, perform loading test and analysis, and calculate energy reserves and rock mechanical parameters. Conventional coring techniques generally meet engineering application requirements in shallow resource exploration, but as the depth of excavation increases, formation pressure and temperature rise significantly, geological conditions become more complex, and conventional coring techniques face significant challenges. Under deep geological environment, temperature and pressure in an in-situ environment are released in the coring drilling process, so that components such as oil, gas and water of a sample are dissipated, minerals are transformed, when the core is recovered to a laboratory, the original state of the core is difficult to keep, the accuracy of experimental and analysis results is reduced, and the energy reserves of the in-situ environment cannot be accurately estimated and measured through testing. In addition, under these complex conditions, the core sample may undergo physical and chemical changes due to sudden changes in pressure and temperature, forming problems such as crack propagation, and further affecting subsequent mechanical analysis and formation geological parameter evaluation. On the premise of not damaging the original properties of the core, the method for obtaining the fidelity effective core sample of the deep reservoir becomes a core problem to be solved in the deep resource exploration field. In order to maintain the in-situ pressure of a rock sample in the deep coring process and keep the in-situ characteristic of the rock to the greatest extent, the prior art also has various pressure-maintaining controllers such as ball valves, flap valves and the like. When the pressure maintaining controllers are used, the core barrel needs to pass through the pressure maintaining controllers in the process of coring so that the front end of the core barrel can be close to a rock stratum to take a rock core, and after coring is finished, the front end of the core barrel needs to be returned to the rear side of the pressure maintaining controllers, and a valve core or a valve plate of the pressure maintaining controllers is closed to achieve the pressure maintaining and fidelity effects of the rock core in the core barrel. The above process shows that when the pressure maintaining and fidelity coring operation is realized by the pressure maintaining controller, an axial displacement process exists between the coring barrel and the pressure maintaining control device, so that the control of the axial displacement action is required to be designed when the pressure maintaining coring tool is designed. Disclosure of utility model The utility model aims to provide a hydraulic self-triggering pressure-maintaining coring tool, which can drive a coring cylinder to axially move by utilizing hydraulic pressure in a ball casting and pressurizing mode after coring is completed, so that the front end of the coring cylinder can be sealed by a pressure-maintaining controller, and the pressure-maintaining and fidelity coring process is completed. The aim of the utility model is realized by the following technical scheme: The hydraulic self-triggering pressure-maintaining coring tool comprises a shell, wherein the front end of the shell is fixedly connected with a coring bit, a coring barrel is coaxially arranged in the shell, the coring barrel is positioned at the rear end of the coring bit, a piston tube, a cylinder barrel and a pressure maintaining controller are coaxially arranged in the shell, one end of the piston tube is fixedly connected with the rear end of the shell, the other end of the piston tube is fixedly provided with a piston, the piston is slidably arranged in the cylinder barrel, the cylinder barrel is slidably matched with the shell, the rear end of the cylinder barrel is slidably matched with the piston tube, one end of the coring barrel is closed, the front end of the cylinder barrel is rotatably connected with the closed end of the coring barrel, and the other end of the coring barrel is matched with the pressure maintaining controller; the piston divides the cylinder barrel into a rod cavity and a rodless cavity, the piston is of a hollow structure, the inner cavity of the piston tube, the inner cavity of the piston and the rodless cavity are sequentially communicated, a penetrating flow passage is formed in the front end of the cylinder barrel, one end of the penetrating flow passage is communicated with the rodless cavity, an annular cavity formed by the outer wall of the coring barrel and