Measuring device for measuring viscosity of shale oil under original formation condition

Abstract

The utility model discloses a measuring device for measuring shale oil viscosity under an original stratum condition, and relates to the technical field of viscosity measurement. Comprising a kinematic viscosity measuring instrument host, a pressure container, an oil chromatographic analyzer, a condenser, a condensate collecting box and a light hydrocarbon storage box, according to the device disclosed by the utility model, the initial light hydrocarbon content and the dehydrated and heated light hydrocarbon content of the shale oil sample are obtained through the oil chromatographic analyzer, so that the loss amount of C8-C15 light hydrocarbons is obtained, then the C8-C15 light hydrocarbons are supplemented into the shale oil sample according to the loss amount, and then the light hydrocarbons are uniformly mixed through the stirring pump, so that the light hydrocarbon content in the shale oil sample is kept unchanged.

Description

TECHNICAL FIELD

[0001] The utility model relates to viscosity measurement technical field, concretely to a kind of measuring device of shale oil viscosity under original formation condition. BACKGROUND

[0002] The viscosity of shale oil is one of the important factors affecting oil well production, and its chemical composition is the most basic factor determining the viscosity. At the same time, the content of gum and asphalt in shale oil is high, which increases the internal friction of molecules and also increases the viscosity of oil.

[0003] Whether it is surface crude oil or underground crude oil, its viscosity is very sensitive to temperature changes. In addition to the composition of crude oil and temperature, the amount of dissolved volatile light hydrocarbons in the oil is the main factor affecting the viscosity of crude oil. With the decrease of this part of light hydrocarbons, the viscosity of the oil also increases accordingly.

[0004] In the prior art, before measuring the viscosity of shale oil sample, the oil sample needs to be dehydrated at 140℃, then the dehydrated shale oil sample is poured into a beaker and heated to 65℃ in a water bath, then the ear cleaning ball is used to suck the crude oil into the viscometer. In the whole experiment process, dehydration, heating and viscosity measurement are different instrument equipment step-by-step operation, and heating is open type at normal pressure, light hydrocarbon has certain loss, Figure 2 、 3 For the shale oil total hydrocarbon chromatogram before and after the existing viscosity test heating and dehydration (140℃), it is found that the dehydration and heating process of shale oil will cause a large loss of C8~C15 light hydrocarbons, and the loss of light hydrocarbon free hydrocarbon will cause the viscosity of shale oil to be too high.

[0005] At the same time, the test personnel operate manually, the operation time and experience difference is large, easy to lead to test data fluctuation, and shale oil viscosity test still needs a lot of optimization and improvement in improving test efficiency and guaranteeing data quality. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a kind of measuring device of shale oil viscosity under original formation condition, which can effectively solve the problems in the background art.

[0007] The technical scheme to achieve the above-mentioned purpose is: a kind of measuring device of shale oil viscosity under original formation condition, characterized by: including kinematic viscosity measuring instrument host computer, pressure vessel, oil chromatographic analyzer, condenser, condensate collection tank, light hydrocarbon storage tank;

[0008] The pressure vessel is installed on the fixed base and is provided with a shale oil input interface, the shale oil input interface is connected to the oil source through an oil inlet valve, the upper and lower ends of the pressure vessel are both open, a piston is arranged in the bottom end opening of the pressure vessel, a gas cylinder for driving the piston to rise and fall is installed on the fixed base, and a falling ball control valve is threadedly connected to the top opening of the pressure vessel.

[0009] The side wall of the pressure container is embedded with an electric heating film, and the side wall of the pressure container above and below the electric heating film is respectively embedded with an induction coil, and the electric heating film and the induction coil are electrically connected with the main machine of the kinematic viscosity measuring instrument;

[0010] The top end of the pressure container is connected with a first control valve, the outlet end of the first control valve is connected with a condenser, and the outlet end of the condenser is connected with a condensate collecting box.

[0011] The outer wall of the pressure container is further connected with a second control valve, and the outlet end of the second control valve is connected with an oil chromatographic analyzer through a first metering pump.

[0012] The light hydrocarbon storage tank is used for supplementing C8-C15 light hydrocarbons into the pressure container.

[0013] Further, the pressure container is further connected with a temperature and pressure sensor which is electrically connected with the main machine of the kinematic viscosity measuring instrument.

[0014] Further, the electric heating film adopts a graphene electric heating film.

[0015] Further, the top of the pressure container is further connected with a sixth control valve, and the bottom of the pressure container is further connected with a seventh control valve, and a stirring pump is further connected in series between the sixth control valve and the seventh control valve.

[0016] Further, the falling ball control valve adopts a ball valve, one end of the ball valve is connected with a sealing cover, the other end is threadedly connected with the upper end of the pressure container, a steel ball containing cavity with an open lower end is arranged at the center position in the sealing cover, and a steel ball is arranged in the steel ball containing cavity.

[0017] Further, the side wall of the pressure container is further connected with a third control valve, the light hydrocarbon storage tank is divided into independent C8 liquid light hydrocarbon storage, C9 liquid light hydrocarbon storage, C10 liquid light hydrocarbon storage, C11 liquid light hydrocarbon storage, C12 liquid light hydrocarbon storage, C13 liquid light hydrocarbon storage, C14 liquid light hydrocarbon storage and C15 liquid light hydrocarbon storage by a partition plate, the C8 liquid light hydrocarbon storage, the C9 liquid light hydrocarbon storage, the C10 liquid light hydrocarbon storage, the C11 liquid light hydrocarbon storage, the C12 liquid light hydrocarbon storage, the C13 liquid light hydrocarbon storage, the C14 liquid light hydrocarbon storage and the C15 liquid light hydrocarbon storage are respectively provided with light hydrocarbon outlets, the light hydrocarbon outlets are correspondingly connected with fifth control valves, and the outlet end of the fifth control valve is connected with the third control valve through a second metering pump.

[0018] The beneficial effects of the present application are as follows: 1) The dehydration, heating, viscosity testing and other processes of the present application are carried out in a closed environment, which reduces the volatilization and dispersion of light hydrocarbons, and the original oil sample does not need to be moved during the intermediate process, thereby ensuring the stability of the sample and the efficiency of the treatment, the data is more accurate, and the green development concept of oil and gas field laboratory is implemented.

[0019] 2) The utility model discloses still obtain the initial light hydrocarbon content of shale oil sample and the light hydrocarbon content after dehydration and heating through oil chromatographic analyzer, thereby obtain the loss of C8~C15 light hydrocarbon, and then according to the loss, supplement the liquid light hydrocarbon of C8~C15 to shale oil sample, after that, mix evenly through the stirring pump, make the light hydrocarbon content in shale oil sample remain unchanged.

[0020] 3) The temperature and pressure under the formation condition are adopted during the test, so that the viscosity test result is closer to the actual viscosity under the original formation condition. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure principle diagram of the utility model;

[0022] Figure 2 The existing viscosity test shale oil total hydrocarbon chromatogram before dehydration and heating (140 DEG C);

[0023] Figure 3 The existing viscosity test shale oil total hydrocarbon chromatogram after dehydration and heating (140 DEG C). DETAILED DESCRIPTION

[0024] As Figure 1 The utility model discloses a kinetic viscosity measuring instrument, which comprises a kinetic viscosity measuring instrument host 1, a pressure container 2, an oil chromatographic analyzer 3, a condenser 4, a condensate collection tank 5 and a light hydrocarbon storage tank 6.

[0025] The pressure container 2 is made of stainless steel and is detachably connected to the fixed base 7 through bolts, and the shale oil input interface 14 is arranged on the pressure container.

[0026] The upper end and the lower end of the pressure container 2 are both open, and the piston 8 is arranged in the bottom end opening of the pressure container 2, and the fixed base is provided with the air cylinder 9 for driving the piston to ascend and descend, and the telescopic end of the air cylinder 9 is vertically upward and connected to the bottom of the piston 8.

[0027] The top opening of the pressure container 2 is threadedly connected to the drop ball control valve 10, the drop ball control valve 10 is a ball valve, one end of the drop ball control valve 10 is connected to a sealing cover, the other end is threadedly connected to the upper end of the pressure container 2, the sealing cover is provided with a steel ball containing cavity 11 with an open lower end at the center, the steel ball containing cavity 11 contains a steel ball 12, and the steel ball 12 is supported at the center of the top end of the ball in the drop ball control valve 10.

[0028] The electric heating film 13 is embedded in the side wall of the pressure container 2, the electric heating film 13 is a graphene electric heating film, the inductive coil 16 is embedded in the side wall of the pressure container above and below the electric heating film 13, and the electric heating film 13 and the inductive coil 16 are electrically connected to the kinetic viscosity measuring instrument host 1.

[0029] The first control valve 17 is connected to one side of the top end of the pressure container 2, the outlet end of the condenser 18 is connected to the outlet end of the first control valve 17, and the outlet end of the condenser 18 is connected to the condensate collecting tank 5.

[0030] The second control valve 20 is further connected to the outer wall of the pressure container 2, and the outlet end of the second control valve 20 is connected to the oil chromatographic analyzer 22 through the first metering pump 21.

[0031] The light hydrocarbon storage tank 5 is divided into independent C8 liquid light hydrocarbon storage tank a, C9 liquid light hydrocarbon storage tank b, C10 liquid light hydrocarbon storage tank c, C11 liquid light hydrocarbon storage tank d, C12 liquid light hydrocarbon storage tank e, C13 liquid light hydrocarbon storage tank f, C14 liquid light hydrocarbon storage tank g and C15 liquid light hydrocarbon storage tank h by a partition, and the C8 liquid light hydrocarbon storage tank a, the C9 liquid light hydrocarbon storage tank b, the C10 liquid light hydrocarbon storage tank c, the C11 liquid light hydrocarbon storage tank d, the C12 liquid light hydrocarbon storage tank e, the C13 liquid light hydrocarbon storage tank f, the C14 liquid light hydrocarbon storage tank g and the C15 liquid light hydrocarbon storage tank h are respectively provided with a light hydrocarbon outlet, the light hydrocarbon outlet is connected with the fifth control valve 24, and the outlet end of the fifth control valve 24 is connected with the pressure container 2 through the second metering pump 29 and the third control valve 23.

[0032] The temperature and pressure sensor 25 is further connected to the pressure container 2 and is electrically connected with the kinematic viscosity measuring instrument host 1.

[0033] The sixth control valve 26 is further connected to the top of the pressure container 2, the seventh control valve 27 is further connected to the bottom of the pressure container 2, and the sixth control valve 26 and the seventh control valve 27 are further connected in series with the stirring pump 28.

[0034] The working process of the utility model is as follows:

[0035] 1) open the oil inlet valve 15, input the shale oil into the pressure container 2 through the shale oil input interface 14, close the oil inlet valve 15 after the input is completed, and the initial light hydrocarbon content in the shale oil sample is obtained through the oil chromatographic analyzer 3.

[0036] 2) open the second control valve 20, control the first metering pump 21 to extract the sample into the oil chromatographic analyzer 2, and obtain the initial light hydrocarbon content in the shale oil sample through the oil chromatographic analyzer 3;

[0037] 3) open the first control valve 17, close the second control valve 20, the third control valve 23, the sixth control valve 26 and the seventh control valve 27, control the electric heating film 13 to heat the shale oil in the pressure container 2 at a temperature of 140 DEG C to dehydrate, the steam evaporated in the dehydration process enters the condenser 4 through the first control valve 17, is condensed into liquid and then flows into the condensate collecting tank 5, and the first control valve 17 is closed after the dehydration is completed, and the electric heating film 13 stops heating.

[0038] 4) open the second control valve 20, control the first metering pump 21 to extract the sample into the oil chromatograph 2, detect the light hydrocarbon content after dehydration, subtract the initial light hydrocarbon content from the light hydrocarbon content after dehydration, obtain the loss of C8~C15 light hydrocarbon in the dehydration process, then close the second control valve 20;

[0039] 5) open the third control valve 23, and then open the fifth control valve 20 of the C8 liquid light hydrocarbon warehouse a, C9 liquid light hydrocarbon warehouse b, C10 liquid light hydrocarbon warehouse c, C11 liquid light hydrocarbon warehouse d, C12 liquid light hydrocarbon warehouse e, C13 liquid light hydrocarbon warehouse f, C14 liquid light hydrocarbon warehouse g, C15 liquid light hydrocarbon warehouse h respectively (when the next fifth control valve 20 is opened, the fifth control valve 20 corresponding to the previous liquid light hydrocarbon warehouse needs to be closed), according to the loss of C8~C15 light hydrocarbon, the second metering pump 29 supplements the same amount of C8~C15 light hydrocarbon into the pressure container 2, and then closes the third control valve 23;

[0040] 6) open the sixth control valve 26 and the seventh control valve 27, and start the stirring pump 28 to mix the shale oil sample in the pressure container 2 uniformly, and then close the sixth control valve 26 and the seventh control valve 27;

[0041] 7) control the electric heating film 13 to heat the shale oil to the formation condition temperature, and the air cylinder 9 drives the piston 8 to go up, compresses the volume in the pressure container 2, and controls the pressure in the pressure container 2 to reach the formation condition pressure;

[0042] 8) control the drop ball control valve 10 to open, and the steel ball 12 falls vertically into the pressure container 2 through the drop ball control valve 10, and the inductor coil 16 senses the signal of the steel ball 12 falling in.

[0043] 9) the kinematic viscosity measuring instrument host 1 calculates the viscosity value of the shale oil according to the viscosity calculation formula (1).

[0044]

[0045] Wherein η is the viscosity of shale oil, ρ is the density of steel ball 8, σ is the density of shale oil, L is the falling distance of steel ball 8, d is the diameter of steel ball 8, t is the falling time of steel ball 8, d is the diameter of steel ball 8, D is the inner diameter of pressure container 2, and H is the height of shale oil.

Claims

1. A measuring device for determining viscosity of shale oil under original reservoir conditions, characterized by: The shale oil kinetic viscosity measuring device comprises a main machine, a pressure container, an oil chromatographic analyzer, a condenser, a condensate collecting box and a light hydrocarbon storage tank. The pressure container is installed on a fixed base and is provided with a shale oil input interface connected to an oil source through an oil inlet valve. The side wall of the pressure container is embedded with an electric heating film, and the side wall of the pressure container above and below the electric heating film is embedded with an induction coil. The top end of the pressure container is connected with a first control valve, the outlet end of the first control valve is connected with the condenser, and the outlet end of the condenser is connected with the condensate collecting box. The outer wall of the pressure container is further connected with a second control valve, and the outlet end of the second control valve is connected with the oil chromatographic analyzer through a first metering pump. The light hydrocarbon storage tank is used for supplementing C8-C15 liquid light hydrocarbons into the pressure container.

2. The apparatus of claim 1, wherein: The pressure container is further connected with a temperature and pressure sensor electrically connected with the main machine of the kinetic viscosity measuring device.

3. The apparatus of claim 1, wherein: The electric heating film is a graphene electric heating film.

4. The apparatus of claim 1, wherein: The top of the pressure container is further connected with a sixth control valve, and the bottom of the pressure container is further connected with a seventh control valve.

5. The apparatus of claim 1, wherein: The ball valve is connected with a sealing cover at one end and is threadedly connected with the upper end of the pressure container at the other end.

6. The apparatus of claim 1, wherein: The side wall of the pressure container is further connected with a third control valve. The light hydrocarbon storage tank is divided into independent C8, C9, C10, C11, C12, C13, C14 and C15 liquid light hydrocarbon storage tanks by a partition plate. The C8, C9, C10, C11, C12, C13, C14 and C15 liquid light hydrocarbon storage tanks are respectively provided with light hydrocarbon outlets, and the light hydrocarbon outlets are respectively connected with fifth control valves. The outlet end of the fifth control valve is connected with the third control valve through a second metering pump.

Images