CN-122016419-A - Crude oil single well sampling device and sampling method

CN122016419ACN 122016419 ACN122016419 ACN 122016419ACN-122016419-A

Abstract

The invention discloses a crude oil single well sampling device and a crude oil single well sampling method. The sampling device comprises an oil chamber component and an air chamber component, wherein the oil chamber component comprises a bottom plate, an outer shell is arranged on the bottom plate, an inner shell is arranged in the outer shell, a plurality of flow guide plates are arranged on the inner wall of the inner shell, the top of the outer shell is connected with a top connecting pipe, the bottom of the outer shell is connected with a bottom connecting pipe, the air chamber component comprises an air chamber shell, the bottom of the air chamber shell is connected with a sampling connecting pipe, and a connecting pipe is connected between the top connecting pipe and the sampling connecting pipe. The invention utilizes the oil chamber component and the air chamber component to mutually cooperate to realize convenient collection and sampling of sample gas, and simultaneously utilizes the heat insulation board and the bottom heat insulation board as the internal heat insulation of the equipment, and uses the mirror surface coating to perform heat insulation outside, and uses double heat insulation measures to improve the heat insulation performance of the device, thereby avoiding wax from precipitating from crude oil to form solid wax crystal to block a pipeline and ensuring the stable use of the device.

Inventors

LI HAORAN
Ding Qianshen
ZHANG SHAOGUANG
LI ZHENG
XU PINGSHENG
HU WANWEI
CHENG ZEHUA
LIU JINGLIANG
ZHANG ZHONGHUA
XIE CHUANXIN

Assignees

中海石油（中国）有限公司天津分公司

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (10)

1. The crude oil single well sampling device is characterized by comprising an oil chamber component and an air chamber component; The oil chamber assembly comprises a bottom plate (100), wherein an outer shell (101) is arranged on the bottom plate (100), an inner shell (102) is arranged in the outer shell (101), and a plurality of flow guide plates (103) are arranged on the inner wall of the inner shell (102), the top of the outer shell (101) is connected with a top connecting pipe (200), and the bottom of the outer shell (101) is connected with a bottom connecting pipe (203); The gas chamber assembly comprises a gas chamber shell (300), a sampling connecting pipe (206) is connected to the bottom of the gas chamber shell (300), and a connecting pipe (400) is connected between the top connecting pipe (200) and the sampling connecting pipe (206).
2. The crude oil single well sampling device according to claim 1, wherein the top connecting pipe (200) is provided with a first switch valve (201) and a second switch valve (202), the bottom connecting pipe (203) is provided with a third switch valve (204) and a fourth switch valve (205), the sampling connecting pipe (206) is provided with a fifth switch valve (207) and a sixth switch valve (208), and two ends of the connecting pipe (400) are respectively connected with the second switch valve (202) and the fifth switch valve (207).
3. The crude oil single well sampling device according to claim 1, wherein an insulation board (104) is arranged between the outer shell (101) and the inner shell (102), and a bottom insulation board (105) is arranged between the bottom plate (100) and the bottom surface of the inner shell (102).
4. A crude oil single well sampling device according to claim 1, wherein the outer side of the outer housing (101) is coated with a mirror coating (108), the mirror coating (108) is a titanium oxide/gold nano coating, and the thickness is 5-20 nanometers.
5. A crude oil single well sampling device according to claim 1, wherein a plurality of baffle plates (103) are alternately arranged obliquely downward on the inner wall of the inner housing (102).
6. The crude oil single well sampling device of claim 1, wherein the inner surface of the inner shell (102) and the guide plate (103) are respectively provided with an oleophobic layer (106), and the oleophobic layer (106) is in a corn leaf horizontal stripe structure.
7. The crude oil single well sampling device according to claim 1, wherein a piston rod (301) is arranged in the air chamber shell (300), the bottom end of the piston rod (301) is connected with a movable disc (302), and the movable disc (302) is in contact with the inner wall of the air chamber shell (300).
8. A crude oil single well sampling device according to claim 1, wherein the top of the outer housing (101) is rotatably connected to a handle (107).
9. A crude oil single well sampling method is characterized in that the crude oil single well sampling device as claimed in any one of claims 1 to 8 is adopted, and the method comprises the following steps: s1, keeping the switching valves in the initial stage in a closed state, emptying the oil chamber assembly, connecting a third switching valve (204) with an oil well to be sampled, then opening the third switching valve (204) and the first switching valve (201), and gradually emptying the mixed gas in the oil chamber assembly through the pressure of the sampled gas; S2, pre-detecting toxic gases of hydrogen sulfide, sulfur dioxide and carbon monoxide of a measurement oil well at a first switch valve (201) by using a handheld gas detector during emptying, if the content of the toxic gases of a gas sample belongs to a safe range, performing a subsequent step, and if the content of the toxic gases exceeds a standard, suspending sampling of the oil well; S3, after 15 minutes of replacement, opening a second switch valve (202) and a fifth switch valve (207), closing a first switch valve (201), inputting pure sample gas into the air chamber assembly, filling the air chamber assembly with the sample gas under the pressure of the sample gas, and jacking up a piston rod (301) and a movable disc (302); S4, closing a first switch valve (201), a second switch valve (202), a third switch valve (204), a fourth switch valve (205) and a fifth switch valve (207), disassembling a connecting pipe (400), connecting a sixth switch valve (208) with gas detection equipment through a pipeline, opening the sixth switch valve (208), and pushing sampling gas to the gas detection equipment by using a piston rod (301) and a movable disc (302).
10. The method for single well sampling of crude oil according to claim 9, wherein in S2, if the flow rate of natural gas flowing out of the oil chamber assembly is lower than the flow rate of single well crude oil entering the oil chamber assembly, the fourth switch valve (205) is opened to properly discharge the liquid in the oil chamber assembly.

Description

Crude oil single well sampling device and sampling method Technical Field The invention relates to the field of single well sampling, in particular to a crude oil single well sampling device and a crude oil single well sampling method. Background With the continuous increase of development force of ocean oil and gas resources in China, offshore oil fields become important energy production bases in China. In the production process of offshore oil fields, various parameters of oil well products are accurately and timely obtained, and the method is very important for oil reservoir dynamic analysis, production optimization, well condition diagnosis and safe production. Single well metering and sampling are key links to obtaining these parameters. In the prior art, the sampling method generally needs to temporarily install a sampling device on a pipeline through which multiphase flow passes or take special measures at a wellhead to sample, the methods are complex in operation and long in time consumption, and the sampling process is easily influenced by human factors, so that the gas sample is poor in representativeness, and the real composition of underground gas is difficult to accurately reflect. In addition, the deep oil well stratum generally has higher temperature and pressure, when the crude oil containing wax is taken out from the stratum and rises to the wellhead, the temperature gradually decreases, the solubility of the wax in the crude oil decreases along with the decrease of the temperature, and when the temperature is lower than the precipitation point (also called cloud point) of the wax, the wax is precipitated from the crude oil to form solid wax crystals, and single well sampling and testing results are affected, so that a novel crude oil single well sampling device and a novel crude oil single well sampling method are needed to meet the demands of people. Disclosure of Invention The invention provides a crude oil single well sampling device and a crude oil single well sampling method, which aim to solve the problems of difficult acquisition of a gas sample and equipment for blocking wax precipitation of an oil sample in the prior art. In a first aspect, the present invention provides a crude oil single well sampling device, which is implemented by adopting the following technical scheme. A crude oil single well sampling device comprises an oil chamber component and an air chamber component; The oil chamber component comprises a bottom plate, an outer shell is arranged on the bottom plate, an inner shell is arranged in the outer shell, and a plurality of flow guide plates are arranged on the inner wall of the inner shell; the air chamber component comprises an air chamber shell, the bottom of the air chamber shell is connected with a sampling connecting pipe, and a connecting pipe is connected between the top connecting pipe and the sampling connecting pipe. Further, a first switch valve and a second switch valve are arranged on the top connecting pipe, a third switch valve and a fourth switch valve are arranged on the bottom connecting pipe, a fifth switch valve and a sixth switch valve are arranged on the sampling connecting pipe, and two ends of the connecting pipe are respectively connected to the second switch valve and the fifth switch valve. Further, a heat insulation board is arranged between the outer shell and the inner shell, and a bottom heat insulation board is arranged between the bottom plate and the bottom surface of the inner shell. Further, the outer side of the outer shell is coated with a mirror coating, the mirror coating is a titanium oxide/gold nano coating, and the thickness is 5-20 nanometers. Further, a plurality of baffle plates are alternately arranged on the inner wall of the inner shell obliquely downwards. Furthermore, the inner surface of the inner shell and the guide plate are both provided with oleophobic layers, and the oleophobic layers are corn bract horizontal stripe structures. Further, a piston rod is arranged in the air chamber shell, the bottom end of the piston rod is connected with a movable disc, and the movable disc is contacted with the inner wall of the air chamber shell. Further, the top of the outer shell is rotatably connected with a handle. In a second aspect, the invention provides a crude oil single well sampling method, which is realized by adopting the following technical scheme. The crude oil single well sampling method adopts the crude oil single well sampling device and comprises the following steps: S1, keeping the switching valves in the initial stage in a closed state, emptying the oil chamber assembly, connecting a third switching valve with an oil well to be sampled, then opening the third switching valve and the first switching valve, and gradually emptying the mixed gas in the oil chamber assembly through the pressure of the sampled gas; S2, pre-detecting toxic gases of hydrogen sulfide, sulfur dioxide and carbon monoxide of a m