Well fluid collecting device of well logging standard well

Abstract

The utility model discloses a well fluid collecting device of a well logging standard well, which comprises an annular mounting cover connected to the end part of the well logging standard well, one side of the annular mounting cover is connected with a liquid density sensor and a U-shaped transmission pipe, and the U-shaped transmission pipe is connected with a first control valve and a cyclone hydraulic separator used for separating liquids with different densities. The high-density liquid output end of the cyclone hydraulic separator is connected with a well killing fluid transfer box through a first pipeline, the low-density liquid output end of the cyclone hydraulic separator is connected with a shaft outlet liquid collecting box through a second pipeline, the well killing fluid transfer box is provided with a power pump which is connected with an output pipe, the output pipe is connected with an extension pipe, and the first pipeline is connected with a second control valve. The extension pipe is connected with a third control valve.

Description

Technical Field

[0001] This utility model belongs to the technical field of standard wells, specifically relating to a well fluid collection device for logging standard wells. Background Technology

[0002] A standard well, also called a calibration well or model well, is a physical model artificially established under experimental conditions with a specific well diameter, depth, and lithology. It is used for the calibration and standardization of logging cables and instruments in the oilfield. A standard logging well used for standardizing logging cables and instruments must meet at least two conditions: a sufficiently long open-hole section and well fluid (kill fluid) inside the wellbore to balance formation pressure. The fluid level must be stable, without rising or falling, at an appropriate distance from the wellhead.

[0003] The existing technology has at least the following problems: external liquids, i.e. wellbore fluid, can easily seep into the bottom open hole section of the logging standard well. Since the density of the external liquid is less than that of the kill fluid, over time, the density of the kill fluid in the logging standard well will become lower and lower, until it causes the serious consequence of being unable to control the well. Utility Model Content

[0004] In view of the problems mentioned above in the background art, the purpose of this utility model is to provide a well fluid collection device for logging standard wells.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A well fluid collection device for a logging standard well includes an annular mounting cap connected to the end of the logging standard well. A liquid density sensor and a U-shaped transmission pipe are connected to one side of the annular mounting cap. The U-shaped transmission pipe is connected to a first control valve and a hydrocyclone separator for separating liquids with inconsistent densities. The high-density liquid output end of the hydrocyclone separator is connected to a kill fluid transfer tank through a first pipe. The low-density liquid output end of the hydrocyclone separator is connected to a wellbore fluid collection tank through a second pipe. The kill fluid transfer tank is equipped with a power pump and connected to an output pipe. The output pipe is connected to an extension pipe. The first pipe is connected to a second control valve, and the extension pipe is connected to a third control valve.

[0007] Furthermore, the upper side of the annular mounting cover is connected to a rain shield via multiple support rods. This structural design can prevent rainwater from entering the logging standard well and protect the components from sun and rain.

[0008] Furthermore, the bottom of the support rod is provided with a trapezoidal insert, and the annular mounting cover is provided with a trapezoidal slot adapted to insert the trapezoidal insert. The support rod is inserted into the corresponding trapezoidal slot of the annular mounting cover through the trapezoidal insert. This structural design facilitates the installation and disassembly of the support rod and the rain cover.

[0009] Further limited, the output pipe and the extension pipe are connected with detachable connection structure, the detachable connection structure is located on the upper side of the rain cover, the structure design is convenient for installation and removal of the output pipe, the extension pipe and the rain cover.

[0010] Further limited, the bottom end of the extension pipe is connected to the surface of the well control fluid in the standard well, and one end of the U-shaped transmission pipe is connected to the bottom of the well control fluid in the standard well, which can conveniently supplement the well control fluid and transmit the well control fluid to the inside of the standard well.

[0011] The beneficial effects of the utility model are:

[0012] 1, the utility model discloses a ring mounting cover, liquid density sensor, U-shaped transmission pipe, hydrocyclone, well control fluid transfer box, wellbore liquid collection tank and output pipe and other relevant connection components, liquid density sensor is separated to low-density wellbore liquid by the cooperation of central controller and hydrocyclone, U-shaped transmission pipe, can automatically reach the effect of separating low-density wellbore liquid, and the well control fluid is transmitted to the well control fluid transfer box and is transmitted to the standard well for secondary use by output pipe, so that the density of the well control fluid in the standard well is kept stable, and the problem of well control fluid being not controlled is caused by the density of the well control fluid being lower and lower due to wellbore liquid mixing well control fluid.

[0013] 2, in addition, while a certain amount of well control fluid is output through the U-shaped pipe, the pure well control fluid in the well control fluid transfer box is supplemented and transmitted to the standard well, so that the water level of the well control fluid in the standard well is always kept flat, and the water level in the standard well is prevented from being affected. DRAWINGS

[0014] The utility model can be further illustrated by the non-limiting embodiments shown in the drawings.

[0015] Figure 1 It is a whole structure section schematic view of the embodiment of the well fluid collecting device of the standard well.

[0016] The main element symbols are explained as follows:

[0017] Standard well 1, well control fluid 101;

[0018] Ring mounting cover 2, support rod 201, trapezoidal insert block 2011, rain cover 202;

[0019] Liquid density sensor 3;

[0020] U-shaped transmission pipe 4, first control valve 401;

[0021] Hydrocyclone separator 5, first pipeline 501, second pipeline 502, second control valve 503;

[0022] Kill fluid transfer box 6;

[0023] Wellbore fluid collection box 7;

[0024] Output tube 8, detachable connection structure 801;

[0025] Extension pipe 9, third control valve 901. Detailed Implementation

[0026] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, the present invention discloses a well fluid collection device for a logging standard well, comprising an annular mounting cover 2 connected to the end of the logging standard well 1. A liquid density sensor 3 and a U-shaped transmission pipe 4 are connected to one side of the annular mounting cover 2. The U-shaped transmission pipe 4 is connected to a first control valve 401 and a hydrocyclone separator 5 for separating liquids with inconsistent densities. The high-density liquid output end of the hydrocyclone separator 5 is connected to a kill fluid transfer tank 6 through a first pipe 501. The low-density liquid output end of the hydrocyclone separator 5 is connected to a wellbore fluid collection tank 7 through a second pipe 502. The kill fluid transfer tank 6 is equipped with a power pump and connected to an output pipe 8. The output pipe 8 is connected to an extension pipe 9. The first pipe 501 is connected to a second control valve 503, and the extension pipe 9 is connected to a third control valve 901.

[0028] In this embodiment, when the liquid density sensor 3 detects that the density of the kill fluid 101 is lower than a certain standard, the liquid density sensor 3 transmits a signal to the central controller. The central controller then activates the hydrocyclone separator 5, the third control valve 901, and the first control valve 401. The hydrocyclone separator 5 and the first control valve 401 operate, drawing the kill fluid from the wellbore through the U-shaped transmission pipe 4 into the hydrocyclone separator 5 to separate the high-density kill fluid from the wellbore and the low-density wellbore fluid. These are then transmitted to the kill fluid transfer tank 6 and the wellbore fluid collection tank 7 through the first pipe 501 and the second pipe 502, respectively. This structural design can automatically separate and collect two liquids with different densities for reuse, keeping the density of the kill fluid 101 in the logging standard well 1 stable and preventing the density of the kill fluid from decreasing due to the mixing of the wellbore fluid with the kill fluid, thus preventing the well from being unable to be controlled.

[0029] Then control the third control valve 901 open, through the output pipe 8 and the extension pipe 9, the pure killing fluid in the transfer tank 6 is transmitted to the well logging standard well 1, the structure design makes the water level of the killing fluid 101 in the well logging standard well 1 always flat, prevents the influence well logging standard well 1 water level maintains balance.

[0030] Preferably, the upper side of the annular mounting cover 2 is connected with a rain shield 202 through a plurality of supporting rods 201, such a structure design can prevent rainwater from entering the well logging standard well, and protect the components from sun and rain. In fact, other structure shapes that can achieve the rainproof effect can also be considered according to specific circumstances.

[0031] Preferably, the bottom of the supporting rod 201 is provided with a trapezoidal plug 2011, the annular mounting cover 2 is provided with a trapezoidal slot matched with the trapezoidal plug 2011, and the supporting rod 201 is inserted into the corresponding trapezoidal slot of the annular mounting cover 2 through the trapezoidal plug 2011. Such a structure design facilitates the installation and removal of the supporting rod 201 and the rain shield 202. In fact, other structure shapes that can facilitate the installation and removal of the supporting rod 201 and the rain shield 202 can also be considered according to specific circumstances.

[0032] Preferably, a detachable connection structure 801 is connected between the output pipe 8 and the extension pipe 9, and the detachable connection structure 801 is located on the upper side of the rain shield 202. Such a structure design facilitates the installation and removal of the output pipe 8, the extension pipe 9 and the rain shield 202. In fact, other structure shapes that can facilitate the installation and removal of the output pipe 8, the extension pipe 9 and the rain shield 202 can also be considered according to specific circumstances.

[0033] Preferably, the bottom end of the extension pipe 9 is in contact with the surface of the killing fluid 101 in the well logging standard well 1, and one end of the U-shaped transmission pipe 4 is in contact with the bottom of the killing fluid 101 in the well logging standard well 1. Such a structure design can facilitate the replenishment and transmission of killing fluid to the inside of the well logging standard well 1 at a lower horizontal height, and facilitate the collection of killing fluid. In fact, other structure shapes that can facilitate the replenishment and transmission and collection of killing fluid can also be considered according to specific circumstances.

[0034] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application shall be covered by the claims of the present application.

Claims

1. A well fluid collecting device for a well standard, comprising a ring-shaped mounting cover (2) connected to the end of a well standard (1), characterized in that: The annular mounting cover (2) is connected with a liquid density sensor (3) and a U-shaped transmission pipe (4) on one side, the U-shaped transmission pipe (4) is connected with a first control valve (401) and a hydrocyclone (5) for separating liquid with inconsistent density, the high-density liquid output end of the hydrocyclone (5) is connected with a well killing fluid transfer box (6) through a first pipeline (501), the low-density liquid output end of the hydrocyclone (5) is connected with a wellbore liquid outlet collection box (7) through a second pipeline (502), the well killing fluid transfer box (6) is provided with a power pump connected with an output pipe (8), the output pipe (8) is connected with an extension pipe (9), the first pipeline (501) is connected with a second control valve (503), and the extension pipe (9) is connected with a third control valve (901).

2. The well fluid collection apparatus for a well logging standard well of claim 1, wherein: The annular mounting cover (2) is connected with a rain shield (202) on the upper side through a plurality of supporting rods (201).

3. The well fluid collection apparatus of claim 2, wherein: The bottom of the supporting rod (201) is provided with a trapezoidal plug (2011), the annular mounting cover (2) is provided with a trapezoidal slot matched with the trapezoidal plug (2011), and the supporting rod (201) is inserted into the corresponding trapezoidal slot of the annular mounting cover (2) through the trapezoidal plug (2011).

4. The well fluid collection apparatus of claim 3, wherein: The output pipe (8) and the extension pipe (9) are connected with a detachable connection structure (801), and the detachable connection structure (801) is located on the upper side of the rain shield (202).

5. The well fluid collection apparatus of claim 4, wherein: The bottom end of the extension pipe (9) is connected with the surface of the well killing fluid (101) in the logging standard well (1), and one end of the U-shaped transmission pipe (4) is connected with the bottom of the well killing fluid (101) in the logging standard well (1).

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