Physical simulation and calibration device and method for formation pressure testing

Patent metadata

Field	Value
Publication number	US-11067492-B2
Application number	US-201816604518-A
Country	US
Kind code	B2
Filing date	Nov 26, 2018
Priority date	May 31, 2018
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A physical simulation and calibration device and method for formation pressure testing. The device has a rock core arranged in a rock core clamper, a confining pressure simulation module, formation pressure simulation module, annular pressure simulation module, suction system, thrust force simulation module and drive control system. The thrust force simulation module has a thrust rod which penetrates through a cavity wall on one side of the clamper. The front end of the thrust rod has a simulation probe. The suction system is connected to the thrust rod. The confining pressure simulation module, formation pressure simulation module, annular pressure simulation module, thrust force simulation module and suction system are all connected with the drive control system. The device and method simulate a physical environment of formation pressure testing to achieve physical simulation of formation pressure testing. A formation pressure tester can be corrected and calibrated.

First claim

The invention claimed is:

1. A physical simulation and calibration device for formation pressure testing, comprising an servo motors for supplying power, and a rock core as a testing target, wherein
the device comprises a rock core clamper;
the rock core is disposed inside the rock core clamper;
an annular gap is reserved between the rock core clamper inner walls and the rock core, and is partitioned into a confining pressure chamber located in the reserved annular gap between the rock core clamper inner walls and outer circumference of the rock core, a formation pressure chamber located between the rock core clamper inner walls and a front end of the rock core, and an annular pressure chamber located between the rock core clamper inner walls and a rear end of the rock core opposite to the front end;
the confining pressure chamber, the formation pressure chamber and the annular pressure chamber, each are provided with a confining pressure injection hole, a formation pressure injection hole and an annular pressure injection hole respectively; input ends of the confining pressure injection hole, the formation pressure injection hole and the annular pressure injection hole are respectively connected to a confining pressure simulation module, a formation pressure simulation module and an annular pressure simulation module respectively;
the device further comprises a thrust force simulation module on which a thrust rod is disposed, wherein the thrust rod penetrates through a wall of the rock core clamper facing the rear end of the rock core; a simulation probe is disposed at the penetrating end of the thrust rod;
the device further comprises a suction system which is connected with the thrust rod;
the device further comprises a drive control system to which the confining pressure simulation module, the formation pressure simulation module, the annular pressure simulation module, the push force simulation module and the suction system are all connected.

2. The physical simulation and calibration device for formation pressure testing according to claim 1 , wherein the outer side of the rock core is wrapped with a rubber sleeve.

3. The physical simulation and calibration device for formation pressure testing according to claim 1 , wherein the confining pressure simulation module comprises a first servo motor; one end of the first servo motor is connected to the drive control system, and the other end is connected to a first speed reducer, a first ball screw, a first hydraulic cylinder, a first group of high pressure stop valves B and a first safety valve in sequence and is finally connected to the confining pressure injection hole; the confining pressure simulation module further comprises an oil tank filled with hydraulic oil; the oil tank is disposed between the first hydraulic cylinder and the first group of high pressure stop valves B; a first group of high pressure stop valves A is also disposed on a pipeline connected to the oil tank; a first pressure sensor is disposed on the first hydraulic cylinder and configured to acquire a confining pressure signal and feeds the confining pressure signal back to the drive control system.

4. The physical simulation and calibration device for formation pressure testing according to claim 3 , wherein the formation pressure simulation module comprises a second servo motor; one end of the second servo motor is connected to the drive control system, and the other end is connected to a second speed reducer, a second ball screw, a second hydraulic cylinder, a second group of high pressure stop valves B and a second safety valve in sequence and is finally connected to the formation pressure injection hole; the formation pressure simulation module further comprises a second container filled with simulation formation fluid; the second container is disposed between the second hydraulic cylinder and the second group of high pressure stop valves B; a second group of high pressure stop valves A is also disposed on a pipeline connected to the second container; a second pressure sensor is disposed on the second hydraulic cylinder and configured to acquire a formation pressure signal and feeds the formation pressure signal back to the drive control system.

5. The physical simulation and calibration device for formation pressure testing according to claim 4 , wherein the annular pressure simulation module comprises a third servo motor; one end of the third servo motor is connected to the drive control system, and the other end is connected to a third speed reducer, a third ball screw, a third hydraulic cylinder, a third group of high pressure stop valves B and a third safety valve in sequence and is finally connected to the annular pressure injection hole; the annular pressure simulation module further comprises a third container filled with simulation drilling fluid; the third container is disposed between the third hydraulic cylinder and the third group of high pressure stop valves B; a third group of high pressure stop valves A is also disposed on a pipeline connected to the third container; a third pressure sensor is disposed on the third hydraulic cylinder and configured to acquire an annular pressure signal and feeds the annular pressure signal back to the drive control system.

6. The physical simulation and calibration device for formation pressure testing according to claim 5 , wherein the thrust force simulation module further comprises a fourth servo motor; one end of the fourth servo motor is connected to the drive control system, and the other end is connected to a fourth speed reducer, and a fourth ball screw the force sensor acquires a thrust force signal and feeds the thrust force signal to the drive control system.

7. The physical simulation and calibration device for formation pressure testing according to claim 6 , wherein the suction system comprises a fifth servo motor; one end of the fifth servo motor is connected to the drive control system, and the other end is connected to a fifth speed reducer, a fifth ball screw, a fifth hydraulic cylinder, and a fifth high pressure stop valve in sequence and is finally connected to the thrust rod through a pipeline; a fifth pressure sensor is disposed on the fifth hydraulic cylinder and configured to acquire a suction signal and feed the suction signal back to the drive control system.

8. The physical simulation and calibration device for formation pressure testing according to claim 7 , wherein an external suction system interface is further disposed on a pipeline connecting the suction system and the thrust rod and is connected to an external suction system; a sixth high pressure stop valve is disposed at the front end of the external suction system interface.

9. A physical simulation and calibration method for formation pressure testing according to claim 8 , comprising the following steps:
S 1 , a preparation stage: preparing the rock core according to experimental requirements, and preparing simulation fluid;
S 2 , installing the rock core: closing all the high pressure stop valves B, dismantling the rock core clamper, replacing the rock core manually, and then installing the rock core clamper;
S 3 , injecting simulation fluid: closing all the high pressure stop valves A, and injecting hydraulic oil, simulation formation fluid and simulation drilling fluid into the oil tank, the second container and the third container, respectively; turning on a system power supply, opening all high-pressure stop valves A, controlling the corresponding servo motor to drive the speed reducer and the ball screw through the drive control system respectively, so as to drive a piston in the hydraulic cylinder to suck the corresponding simulation fluid into the hydraulic cylinder;
S 4 ,

Assignees

• Univ Southwest Petroleum

Inventors

• Ma Tianshou
• Peng Nian
• Chen Ping
• Wang Xingming
• Wang Qiang
• Fu Jianhong

Classifications

• E21B47/06

  Measuring temperature or pressure · CPC title

• G01N15/082

  Investigating permeability by forcing a fluid through a sample · CPC title

• E21B49/006

  Measuring wall stresses in the borehole · CPC title

• G01N15/0826 Primary

  and measuring fluid flow rate, i.e. permeation rate or pressure change · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title