CN-121993171-A - Underground tool function test bench and test method

CN121993171ACN 121993171 ACN121993171 ACN 121993171ACN-121993171-A

Abstract

The invention provides a downhole tool function test bench and a test method, wherein the downhole tool function test bench comprises a simulation drill rod and a simulation sleeve; the simulated drill rod comprises an inlet end cover, an inlet section drill rod, an underground tool, an opposite-plug drill rod and an outlet end cover, wherein the simulated sleeve comprises a first sleeve tee joint, a long sleeve, a short sleeve and a second sleeve tee joint, the inlet section drill rod, the underground tool and the opposite-plug drill rod are positioned in the simulated sleeve, the inlet end cover is connected with a drill rod flowmeter and a pressure sensor, the outlet end cover is connected with the drill rod flowmeter and the pressure sensor, the drill rod flowmeter of the outlet end cover is connected with a connecting pipe, the connecting pipe is connected with a pressure regulating valve, the pressure regulating valve is connected with the first sleeve tee joint, the long sleeve, the short sleeve, the first sleeve tee joint and the second sleeve tee joint are respectively provided with the pressure regulating valve, and the first sleeve tee joint is connected with the pressure regulating valve. The invention has the advantage that the downhole tool can be tested with different pressures and displacements, flow patterns, densities and viscosities.

Inventors

CHEN ZHAOXI
LU SIYU
TANG GUI
LIU QING
Zuo xing
TANG GUOJUN
CHEN WU
SONG XU
LIU XIAOWEI
JIANG LIN

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. A downhole tool function test stand, characterized in that the test stand comprises a simulated drill pipe and a simulated casing, wherein, The simulated drill rod comprises an inlet end cover, an inlet section drill rod, an underground tool, an opposite-plug drill rod and an outlet end cover which are sequentially connected, the simulated drill rod comprises a first sleeve tee joint, a long sleeve, a short sleeve and a second sleeve tee joint which are sequentially connected, the inlet section drill rod, the underground tool and the opposite-plug drill rod are positioned in the simulated drill rod, the inlet end cover is arranged at one end of the first sleeve tee joint, the outlet end cover is arranged at one end of the second sleeve tee joint, one outlet of the first sleeve tee joint is connected with a second sleeve tee joint, one outlet of the second sleeve tee joint is connected with a first sleeve tee joint, the first sleeve tee joint is connected with a first pressure regulating valve, the inlet end cover is connected with a first drill rod flowmeter and a first pressure sensor, the outlet end cover is connected with a second drill rod flowmeter and a fourth pressure sensor, the second drill rod flowmeter is connected with the first pressure regulating valve, the long sleeve is provided with a second pressure sensor, the short sleeve is provided with a third pressure sensor, the first sleeve tee joint is provided with a fifth pressure sensor, and the second sleeve tee joint is provided with a sixth pressure sensor.
2. The downhole tool function test stand according to claim 1, wherein a second step surface is arranged on one side of the inlet end cover, close to the inlet section drill rod, a first step surface is arranged on one side of the first sleeve tee, close to the inlet end cover, and the second step surface is matched with the first step surface to axially fix the first sleeve tee and the inlet end cover.
3. The downhole tool function test stand of claim 1, wherein the butt drill rod is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.
4. The downhole tool function test bench according to claim 1, wherein the outlet end cover is provided with a shaft groove and a stepped shaft surface, a bearing retainer ring is arranged in the shaft groove, and the stepped shaft surface is provided with a bearing embedded with the stepped shaft surface, and the bearing retainer ring is used for limiting the bearing.
5. The underground tool function test bench according to claim 1, wherein the outlet end cover is provided with an inner cavity, and a gap of 15-30 cm is formed between the outlet end face of the opposite-inserted drill rod and the wall surface of the inner cavity in the axial direction.
6. The downhole tool function test stand of claim 1, wherein the entry drill pipe, the counter drill pipe, and the downhole tool are each sleeved with a centralizer.
7. The downhole tool function test stand of claim 1, wherein the downhole tool comprises a measurement while drilling tool, a downhole gas invasion monitoring tool, and a downhole bypass valve.
8. The downhole tool function test stand of claim 1, wherein the inlet end cap, the inlet section drill pipe, the downhole tool, the counter drill pipe, and the outlet end cap are threadably coupled to one another.
9. The downhole tool function test stand of claim 1, wherein the first casing tee, the long casing, the short casing, and the second casing tee are connected to each other via a flange, the inlet end cap is connected to the first casing tee via a flange, the first casing tee is connected to the second casing tee via a flange, the outlet end cap is connected to the second casing tee via a flange, the second casing tee is connected to the first casing tee via a flange, the inlet end cap is connected to the first drill pipe flow meter via a flange, the outlet end cap is connected to the second drill pipe flow meter via a flange, the second drill pipe flow meter is connected to the connecting pipe via a flange, the connecting pipe is connected to the first pressure regulating valve via a flange, the first casing tee is connected to the first pressure regulating valve via a flange, and the second casing tee is connected to the second pressure regulating valve via a flange.
10. A downhole tool function testing method, wherein the downhole tool function testing method is implemented by a downhole tool function testing stand according to any of claims 1-9, the testing method comprising the steps of: s1, delivering fluid with specific density, flow state and rheological parameters from a liquid storage tank at specific displacement; s2, after the fluid sequentially passes through the inlet end cover, the inlet section drill rod, the downhole tool and the opposite-plug drill rod, the fluid flows to the outlet end cover to finish the flow in the simulation drill rod; s3, the fluid sequentially passes through the second sleeve tee joint, the short sleeve, the long sleeve and the first sleeve tee joint and then returns to the liquid storage tank to finish the flow in the simulation sleeve; S4, monitoring data of a first drill pipe flowmeter, a second drill pipe flowmeter, a first pressure regulating valve, a second pressure regulating valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor and a sixth pressure sensor; s5, controlling the valve position opening of the first pressure regulating valve, and regulating the pressure in the simulation sleeve; S6, controlling the valve position opening of the second pressure regulating valve, and regulating the pressure in the simulated drill string; S7, monitoring data of a first drill pipe flowmeter, a second drill pipe flowmeter, a first pressure regulating valve, a second pressure regulating valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor and a sixth pressure sensor; S8, changing one or more parameters of fluid displacement, flow state, density and rheological parameters, and repeating the steps S1 to S7.

Description

Underground tool function test bench and test method Technical Field The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a functional test bench and a test method for an underground tool. Background In the technical field of petroleum and natural gas exploration and development, due to limited ground test means at present, the functionality test of a new tool in the pit often depends on a tool logging experiment, and the new tool mainly has the following two problems of (1) falling object logging risk caused by substandard performance of the new tool in the pit. Since new tools downhole undergo a long and tedious process from design machining to assembly forming, certain flaws or defects are unavoidable during the process. If a new tool is directly connected into the well for testing, the whole or parts of the tool may fall off from the connecting piece under the erosion of drilling fluid, so that falling objects fall into the bottom of a kilometer well, and finally the situation of long subsequent processing time and great difficulty is caused. And (2) the cost of the well entering experiment is high. Because each subsystem of the drilling equipment operates in a linkage way, equipment which needs to be operated in a well entering experiment comprises a lifting system, a circulating system, a transmission system, a control system and a power driving system, and the total daily cost of the system is about 4 ten thousand yuan at the lowest, so that the cost is too high. When a function test is performed on a specific tool, the whole system is not required to be used, so that the phenomenon of resource over-allocation exists in a well entering experiment. Therefore, the underground tool function test bench and the underground tool function test method have important significance. The Chinese patent with the application number of CN201020622074.6 and the name of multifunctional test device for simulating gas drilling tool discloses a multifunctional test device for simulating gas drilling tool, which is formed by connecting gas-feeding sand-mixing system, power system, transmission system, test system and basic circulation system through valve and pipeline. The system comprises a feeder, a cyclone separator, a fan unit and the like, the power system comprises a motor, a rotating head, a radial pressurizing device and the like, the transmission system comprises an oil motor, an oil cylinder, a hydraulic station and the like, the test system comprises a torque rotation speed transmitter, a tension pressure transmission transmitter, a displacement transmitter, a pressure transmitter, a flow sensor, a flow transmitter, a remote control display recording system and the like, and the basic circulation system comprises a cement foundation, a test piece, a big belly, a split sleeve, a derrick and a dust settling device. The device provides a multifunctional test platform for researching fatigue fracture failure of the gas drilling tool and related problems in the gas drilling process. However, unlike the present application, the device is not capable of testing a wide variety of downhole tools. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the purposes of the present invention is to solve the technical problems of how to find defects of a new tool in the well in advance and avoid the risk of falling objects into the well caused by the direct access of the new tool in the well due to the performance defects, and the other purpose is to solve the technical problems of how to configure different experimental equipment for different tools in the well and reduce the time cost and the loss of money cost caused by the non-working of the tool in the well. In order to achieve the above object, according to one aspect of the present invention, there is provided a downhole tool function test stand, which may include a simulation drill pipe and a simulation casing, wherein the simulation drill pipe includes an inlet end cap, an inlet section drill pipe, a downhole tool, an opposite drill pipe and an outlet end cap which are sequentially connected, the simulation casing includes a first casing tee, a long casing, a short casing and a second casing tee, the inlet section drill pipe, the downhole tool and the opposite drill pipe are sequentially connected, the inlet end cap is disposed at one end of the first casing tee, the outlet end cap is disposed at one end of the second casing tee, one outlet of the first casing tee is connected with a second casing tee adapter, one outlet of the second casing tee is connected with a first casing tee adapter, the first casing tee adapter is connected with a first pressure regulating valve, the inlet end cap is connected with a first drill pipe flowmeter and a first pressure sensor, the outlet end cap is connected with a secon