Apparatus for sampling and logging on all producing zones of a well

• US 20040221983A1
• Filed: 06/11/2004
• Published: 11/11/2004
• Est. Priority Date: 06/07/2001
• Status: Active Grant

• Current Assignee: XI'An Jingshixin Petroleum Technology Development, Ltd.
• Original Assignee: Jianguo Ma, Yong Ma
• Inventors: Ma, Jianguo, Ma, Yong
• Granted Patent: US 7,373,812 B2
• Time in Patent Office: Days
• US Class Current: 166/100
• CPC Class Codes: E21B 49/10 using side-wall fluid samplers or testers

Abstract

The present invention discloses a full reservoir sampling and testing apparatus having a ground surface testing and controlling tool (36) and a downhole tool (1), the downhole tool (1) comprises a wireline bridle (21), an adapter joint AH64 (2) connected to the wireline bridle (21), a GR pup joint, an electric unit (4), a single probe unit (5), a pumping unit (6), a dual packer unit (7), and a multi sampling unit (8); the ground surface testing and controlling tool (36) comprises a power supply controller, a computer system and a relevant control, analysis and interpretation software; an upper portion of the pumping unit (6) is connected to the single probe unit (5) and a lower portion thereof is connected to the multi sampling unit (8).

Claims

1. A full reservoir sampling and testing apparatus having a ground surface testing and controlling tool and a downhole tool, wherein said downhole tool of the full reservoir sampling and testing apparatus comprises a wireline bridle, an adapter joint AH64, a GR pup joint, an electric unit, a single probe unit, a pumping unit, a dual packer unit, and a multi sampling unit;

said ground surface testing and controlling tool comprises a power supply controller, a computer system and a relevant control, analysis and interpretation software;

an upper portion of said pumping unit is connected to said single probe unit and a lower portion thereof is connected to said multi sampling unit, said pumping unit has a pump discharging function of discharging formation mud filtrate into high back pressure mud in a well bore, a pumping pre-test, function of performing various-volume pre-tests, and a pumping and sampling function of closing a discharging passage of the mud filtrate through program control and pumping a formation fluid into a sampling chamber when a sample is identified as a formation original fluid sample during the pump discharging.

2. The full reservoir sampling and testing apparatus according to the claim 1, wherein a pump piston of said pumping unit is provided with a suction chamber having a pre-test function, volume of said suction chamber can be changed from zero to a predetermined value repeatedly under action of hydraulic pressure, thus performing pre-test many times.

3. The full reservoir sampling and testing apparatus according to the claim 2, wherein the maximum volume of said suction chamber is 500 ml, thus providing various pre-test flows having a large variation range so as to meet requirements of various formations.

4. The full reservoir sampling and testing apparatus according to the claim 3, wherein said pumping unit uses a power system having a DC brushless motor and a variable flow pump, or a multi power system having several AC motors and several constant flow pumps, said multi power system employs a plurality of motors to drive a plurality of plunger pumps respectively so as to provide various pre-test flows, so that dynamic parameters and original formation oil, gas and water outputs of the full reservoir of one well can be determined through tests performed by going to the downhole one time, thus creating a database of said dynamic parameters of the full reservoir in one well.

5. The full reservoir sampling and testing apparatus according to the claim 1, wherein said pumping unit comprises a hydraulic oil tank, a multistage power section, an upper pumping fluid control section, a pumping fluid tank and a lower pumping fluid control section, said pump discharging can be preformed by using the selected maximum discharge capacity under a pressure higher than a formation fluid saturation pressure.

6. The full reservoir sampling and testing apparatus according to the claim 1 or 5, wherein said pumping unit uses a power system having a DC brushless motor and a variable flow pump, or a multi power system having several AC motors and several constant flow pumps, said multi power system employs a plurality of motors to drive a plurality of plunger pumps respectively, said pumps can provides various discharging capacity having a large variation range so as to meet requirements of various formations.

7. The full reservoir sampling and testing apparatus according to the claim 1, wherein said multi sampling unit comprises a plurality of sampling chambers, one artesian flow sampling chamber, and a series of control valves and sample transport valves;

a piston is provided in each sampling chamber to partition said sampling chamber into an upper chamber for collecting sample and a lower chamber having an opening communicated with well fluid mud, thus ensuring pressure in said sampling chamber being much higher than formation static pressure while and after sampling is performed.

8. The full reservoir sampling and testing apparatus according to the claim 1, wherein two igniter switch valves are connected to each sampling chamber in series, one of which is normally closed and the other is normally opened;

closing and opening of each sampling chamber are controlled by the igniter switch valves, each igniter switch valve is composed of an electric igniter and an slide-valve switch.

9. The full reservoir sampling and testing apparatus according to the claim 1, wherein said dual packer control section is a control assembly used for controlling “

seating and sealing” and

unsealing of sealing and isolating capsules of the dual packer, a hydraulic oil tank is provided at the dual packer control section, and a balance piston is provided in the hydraulic oil tank to partition the hydraulic oil tank into two portions, an outside of the piston is communicated with the well fluid mud, and an inside thereof is filled with a hydraulic oil, the balance piston can move in the hydraulic oil tank, thus keeping the oil pressure in the hydraulic oil tank equal to a well fluid pressure all the time;

said dual packer control section is also provided with an isolation valve, a seal valve, a check valve, a solenoid valve, a pump pressure sensor, a pressure release valve and so on, so as to accomplish “

seating and sealing” and

unsealing of the dual packer, a sample identifying sensor is connected in a sample pipeline of the dual packer control section in series for identifying physical properties of a fluid sample passing through the sample pipeline so as to obtain the original formation fluid of the reservoir.

10. The full reservoir sampling and testing apparatus according to the claim 1 or 9, wherein said sampling unit has more than ten sampling chambers for directly obtaining the formation original fluid samples in large batches, a full-parameters database of original fluid physical property of full reservoir in one well can be created by analyzing the original fluid samples under conditions of high temperature-high pressure and atmospheric pressure in a laboratory.