CN219061599U - A multifunctional sand control performance evaluation device for downhole formations - Google Patents

Abstract

According to the underground stratum multifunctional sand control performance evaluation device provided by the utility model, stratum characteristics and well completion characteristics are simulated through the stratum simulation device, the outer side of a sand control pipe is sequentially sleeved with an inner cylinder support frame, an outer cylinder support frame and a kettle body, an artificial stratum is filled between the inner cylinder support frame and the outer cylinder support frame, and an experimental medium is filled between the kettle body and the outer cylinder support frame. Experimental medium enters from a medium inlet of the kettle body, passes through the outer cylinder support frame, the artificial stratum, the inner cylinder support frame and the sand prevention pipe, and is discharged from a medium outlet of the bottom sealing piece. The experimental medium and sand discharged from the medium outlet are subjected to solid-liquid condensation and separation through the condenser and the separator, and the injection pump provides experimental medium driving pressure. The internal pressure of the stratum simulation device and the weight and flow of the inflow and discharge experimental medium are measured through the measuring device, and the data measured by each device are collected and displayed through the data collecting and processing device, so that different well completion modes and sand prevention parameters are simulated, and the performance of each sand prevention component is effectively evaluated.

Description

A multifunctional sand control performance evaluation device for downhole formations

technical field

The utility model belongs to the technical field of geothermal, coal bed gas and oil and gas exploitation, in particular to a multi-functional sand control performance evaluation device for downhole strata.

Background technique

Due to the influence of factors such as well completion methods, formation characteristics, and production pressure differences, solid particles are prone to stuck pumps in the process of geothermal, coalbed methane, and oil and gas exploitation, resulting in production reduction or even production shutdown. The solid particles may include sand or coal powder produced in the formation. Aiming at the phenomenon of solid particles stuck in the pump, the research and development personnel designed a sand control pipe with sand control function.

Existing similar systems with sand control performance generally have the following disadvantages:

(1) The function is simple, and it cannot simulate the overall evaluation experiment of sand control components such as sand control pipes under different completion methods and sand control parameters;

(2) It is impossible to simulate the slow sand production process of the reservoir, and it is inconvenient to study the clogging of sand control components such as sand control pipes and the amount of sand produced;

(3) Considering that the reservoir has many porosity and permeability characteristics, it is relatively simple to study the clogging mechanism of sand control components such as sand control pipes, which leads to complicated experimental processes and cannot quickly obtain regular knowledge;

(4) Inaccurate control of temperature and pressure makes the measurement of the experimental results inaccurate and brings large errors to the experiment;

(5) No separator and liquid level monitoring system are designed, which is inconvenient for experimental operation control;

(6) Some equipment has slow operation and control speed, low efficiency, large error, inconvenient cleaning and unsafe. The operation is inconvenient, the experimental process cannot be better controlled, and there are even potential safety hazards, which bring great inconvenience to the development of experimental research.

Therefore, how to simulate different well completion methods and sand control parameters, and effectively evaluate the performance of each sand control component is an urgent problem to be solved by those skilled in the art.

Utility model content

The purpose of the utility model is to provide a multifunctional sand control performance evaluation device for downhole formations, which can simulate different well completion methods and sand control parameters, and effectively evaluate the performance of each sand control component.

In order to solve the above technical problems, the utility model provides a multi-functional sand control performance evaluation device for downhole formations, including: formation simulation device, circulation device, measurement device and data acquisition and processing device;

The formation simulation device includes a frame, a kettle body, a kettle cover, an outer cylinder support frame, an inner cylinder support frame, a sand control pipe, a bottom seal and a constant temperature box; the frame is used to support the kettle body, and the kettle body The body is a cylindrical structure with an open top, the open end of the kettle body is detachably connected to the kettle cover, and several filter holes are opened on the outer cylinder support frame, the inner cylinder support frame and the sand control pipe. , the kettle body, the outer cylinder support frame, the inner cylinder support frame and the sand control pipe are set sequentially from the outside to the inside, and the two ends of the outer cylinder support frame are respectively connected to the kettle cover and the kettle The bottom of the body is connected, and a medium cavity for filling the experimental medium to be mined is formed between the outer cylinder support frame and the kettle body, and the space between the outer cylinder support frame and the inner cylinder support frame is used for filling simulation. An artificial formation with formation characteristics under well completion conditions, the kettle body is provided with a medium inlet communicating with the medium cavity, the bottom seal is provided with a medium outlet for discharging the experimental medium, and the inner cylinder support frame is used for For simulating the pipe wall used in different completion methods, when simulating the open hole completion method, remove the inner tube support frame;

The circulation device includes an injection pump, a separator for separating the medium, and a condenser. The injection pump supplies the medium to the medium inlet of the formation simulation device through a high-pressure pipeline, and the medium outlet of the formation simulation device passes through a high-pressure pipeline. Connecting the condenser and the separator in turn;

The measuring device is used to measure the internal pressure of the formation simulation device, the weight and flow rate of the medium inlet and medium outlet experimental medium;

The data collection and processing device is used for collecting and displaying the data of the formation simulation device, the circulation device and the measurement device.

Optionally, in the above multifunctional sand control performance evaluation device for downhole formations, the bottom sealing member includes a sand control fixing frame and a lead-out pipe, and the sand control fixing frame is provided with an installation groove for inserting into the opening of the sand control pipe, and the The outlet pipe runs through the kettle body, and one end communicates with the installation groove, and the other end communicates with the high-pressure pipeline of the circulation device.

Optionally, in the above-mentioned downhole formation multi-functional sand control performance evaluation device, a first sealing ring is arranged between the outlet pipe and the kettle body;

And/or, the bottom of the kettle cover is provided with a pressure plate, and a second sealing ring is provided between the pressure plate and the kettle body.

Optionally, in the above multi-functional sand control performance evaluation device for downhole formations, when the perforation completion method is adopted, the inner barrel support frame is a perforation support frame with blast holes;

When the liner pipe completion method is adopted, the inner barrel support frame is a liner pipe support frame;

When gravel packing is used to complete the well, the inner cylinder support frame includes an inner and outer ring-shaped inner layer and an outer ring-shaped layer, both of which are screen-like structures with a gap between them. Filled with gravel.

Optionally, in the above multifunctional sand control performance evaluation device for downhole formations, the measuring device includes: a first pressure sensor for detecting the medium inlet pressure of the kettle body, and/or for detecting the pressure of the inner cylinder a second pressure sensor for artificial formation pressure between the support frame and the outer cylinder support frame, and/or a third pressure sensor for detecting the annular pressure between the inner cylinder support frame and the sand control pipe, and /or, the fourth pressure sensor used to detect the outer wall of the sand control pipe, and/or the fifth pressure sensor used to detect the medium outlet pressure of the bottom seal.

Optionally, in the above-mentioned downhole formation multifunctional sand control performance evaluation device, the circulation device further includes a preheating device for heating the experimental medium injected into the pump.

Optionally, in the above-mentioned downhole formation multifunctional sand control performance evaluation device, the measurement device includes: a temperature sensor for measuring the temperature of the formation simulation device, the constant temperature box and/or the preheating device.

Optionally, in the above-mentioned downhole formation multifunctional sand control performance evaluation device, the measuring device includes: a weighing flow acquisition device for measuring the flow rate and weight of the experimental medium discharged from the medium outlet.

Optionally, in the above multi-functional sand control performance evaluation device for downhole formations, the number of the medium inlets is multiple, the multiple medium inlets are evenly distributed around the kettle body, and each of the medium inlets is provided with a Valves that independently control the opening and closing of each medium inlet.

Optionally, in the above multi-functional sand control performance evaluation device for downhole formations, the kettle cover and the kettle body are detachably connected by a first screw, and/or, the inner cylinder support frame and the kettle body A second screw rod is used for detachable connection between them.

The utility model provides a multi-functional sand control performance evaluation device for downhole strata, and its beneficial effects are as follows:

Simulate the construction environment in the well when exploiting geothermal, coalbed methane and oil and gas through the stratum simulation device, set the inner cylinder support frame, the outer cylinder support frame and the kettle body in sequence on the outside of the sand control pipe, and fill the space between the inner cylinder support frame and the outer cylinder support frame Artificial formation, filled with experimental medium between the kettle body and the outer cylinder support frame. The experimental medium enters from the medium inlet of the kettle body, passes through the outer cylinder support frame, artificial formation, inner cylinder support frame, and sand control pipe, and is discharged from the medium outlet of the bottom seal. This structure can effectively simulate formation and well completion characteristics. When simulating different well completion methods, the inner barrel support frame can adopt the pipe wall used in the corresponding well completion method, especially, when simulating the open hole completion method, the inner barrel support frame can be removed. At the same time, the solid-liquid condensation and separation of the experimental medium and sand discharged from the medium outlet are carried out through the condenser and separator of the circulation device, and the injection pump provides the driving pressure of the experimental medium. Then the measurement device measures the internal pressure of the formation simulation device, the weight and flow rate of the experimental medium discharged from the medium inlet and medium outlet, and the data collected and displayed by the data acquisition and processing device. The above settings can simulate different completion methods and sand control parameters, and then effectively evaluate the performance of sand control components such as sand control pipes, inner cylinder support frames and outer cylinder support frames.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a structural schematic diagram of a multifunctional sand control performance evaluation device for downhole strata provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the still body that the utility model embodiment provides;

Fig. 3 is a front view of the frame provided by the embodiment of the utility model.

In the picture:

Stratum simulation device: 101-kettle body; 1011-medium inlet; 1012-second screw; 102-kettle cover; 1021-first screw; 1022-pressure plate; 1023-second sealing ring; 103-sand control pipe; Seal; 1041-sand control fixing frame; 1042-export pipe; 1043-first sealing ring; 1044-medium outlet; 105-annulus; 106-inner cylinder support frame; Outer cylinder support frame; 110-medium chamber; 120-frame; 130-incubator;

Circulation device: 201-injection pump; 202-high pressure pipeline; 203-separator; 204-condenser;

Measuring device: 301-first pressure sensor; 302-second pressure sensor; 303-third pressure sensor; 304-fourth pressure sensor; 305-weighing flow acquisition device; 306-fifth pressure sensor; 4-data acquisition Processing device.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that when it comes to orientation descriptions, for example, the orientations or positional relationships indicated by up, down, front, back, left, right, etc. are based on the orientations or positional relationships shown in the accompanying drawings, only It is for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

In the description of this utility model, multiple means more than two. If the first and second are described only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating The number of indicated technical features or implicitly indicates the order of the indicated technical features.

In the description of the utility model, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above-mentioned words in the utility model in combination with the specific content of the technical solution .

The core of the utility model is to provide a multifunctional sand control performance evaluation device for downhole formations, which can simulate different well completion methods and sand control parameters, and effectively evaluate the performance of each sand control component.

In order to make those skilled in the art better understand the technical solutions provided by the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Specifically, please refer to Fig. 1-Fig. 3, Fig. 1 is a structural schematic diagram of a multi-functional sand control performance evaluation device for downhole strata provided by the embodiment of the utility model; Fig. 2 is a schematic structural diagram of the kettle body provided by the embodiment of the utility model ; Figure 3 is a front view of the rack provided by the utility model embodiment.

The utility model provides a multifunctional sand control performance evaluation device for downhole formations, which includes: a formation simulation device, a circulation device, a measurement device and a data acquisition and processing device 4 .

Wherein, the formation simulation device includes a frame 120 , a kettle body 101 , a kettle cover 102 , an outer cylinder support frame 109 , an inner cylinder support frame 106 , a sealing cover 107 , a sand control pipe 103 , a bottom seal 104 and a constant temperature box 130 . The frame 120 is used to support the kettle body 101, the kettle body 101 is a cylindrical structure with an open top, the open end of the kettle body 101 is detachably connected to the kettle cover 102, the outer cylinder support frame 109, the inner cylinder support frame 106 and the sand control pipe 103 There are a number of filter holes on the top, the kettle body 101, the outer cylinder support frame 109, the inner cylinder support frame 106 and the sand control pipe 103 are set sequentially from the outside to the inside, and the two ends of the outer cylinder support frame 109 are connected with the kettle cover 102 and the kettle body respectively. 101 is connected at the bottom, and a medium cavity 110 for filling the experimental medium is formed between the outer cylinder support frame 109 and the kettle body 101, and the space between the outer cylinder support frame 109 and the inner cylinder support frame 106 is used for filling and simulating formation characteristics under certain well completion conditions The tank body 101 is provided with a medium inlet 1011 communicating with the medium chamber 110, and the bottom seal 104 is provided with a medium outlet 1044 for discharging the experimental medium. The inner barrel support frame 106 is used to simulate the pipe wall used in different well completion methods, and supports the artificial formation 108 to prevent solid particles from burying the sand control pipe 103 . Additionally, when simulating open hole completions, the inner barrel support frame 106 is removed.

The circulation device includes an injection pump 201, a separator 203, and a condenser 204. The injection pump 201 supplies the experimental medium to the medium inlet 1011 of the formation simulation device through the high-pressure pipeline 202, and the medium outlet 1044 of the formation simulation device is connected to the condenser 204 through the high-pressure pipeline 202 in turn. and separator 203;

The measuring device is used to measure the internal pressure of the formation simulation device and the weight and flow rate of the experimental medium discharged from the medium outlet 1044. The solid-liquid mixture discharged from the medium outlet 1044 is separated into solid particles and liquid by the separator 203, wherein the weight and flow rate of the liquid are The weight and flow rate of the experimental medium discharged from the medium outlet 1044.

The data collection and processing device 4 is used to collect and display the data of the stratum simulation device, circulation device and measurement device.

It should be noted that, according to the geological characteristics of the production layer, the completion methods include perforation completion, open hole completion, liner completion and gravel packing completion. The inner barrel support frame 106 can adaptively select the corresponding pipe wall according to the corresponding well completion method. When the perforation completion method is adopted, the inner barrel support frame 106 is a perforation support frame with blastholes; when the open hole completion method is adopted, the inner barrel support frame 106 is removed. The open hole completion method is mainly used for relatively hard formations and difficult Broken rock structure; when the liner completion method is adopted, the inner cylinder support frame 106 is a liner support frame; layer, the annular inner layer and the annular outer layer are all designed as a screen-like structure with gravel filled between them, the outer side of the annular outer layer is the medium cavity 110, and the inner side of the annular inner layer is an artificial formation. The inner cylinder support frame 106 is designed according to the actual situation for the density and diameter of the filter holes.

It should also be noted that the artificial strata can be artificial cores, rock sample particles or other particles, and the rock samples can be coal rock, sandstone or other rock samples, which can actually be selected according to the simulated stratum.

When applying geothermal mining, the experimental medium is hot water, and the artificial formation can be rock sample particles bonded by coagulant; when applying coalbed methane mining, the experimental medium is methane gas (or contains formation water, chemical solution or at least two of the above mixture of substances), the artificial formation 108 can be coal rock particles bonded by a coagulant, etc.; when applying oil extraction, the experimental medium is petroleum, formation water, chemical solution or a mixture of the above-mentioned at least two substances, and the artificial formation can be made by Coagulant-bonded sand particles, etc. The dosage ratio of the coagulant to the sand body, the particle size and type of the sand body, the type of coagulant, the strength of the artificial formation, etc. can be flexibly designed according to the needs.

In some embodiments, concrete made by mixing sand and cement is used instead of the artificial formation to simulate the formation.

In some embodiments, some coagulants are not selected, and sand or coal powder is used instead of the artificial formation to simulate the formation.

The sand control pipe 103 can be designed and selected according to the type of test required, such as slotted, wound wire, metal mesh, and metal wool and other types of sand control pipes.

The utility model provides a multi-functional sand control performance evaluation device for downhole strata, which simulates the construction environment in the well when oil, natural gas and other media are exploited through a stratum simulation device, and an inner tube support frame 106 and an outer tube support frame 109 are sequentially set on the outside of the sand control pipe 103 With the kettle body 101 , between the inner cylinder support frame 106 and the outer cylinder support frame 109 simulating an artificial formation with certain completion formation characteristics, and between the kettle body 101 and the outer cylinder support frame 109 filled with experimental medium. The experimental medium enters from the medium inlet 1011 of the kettle body 101, passes through the outer cylinder support frame 109, the artificial formation, the inner cylinder support frame 106, and the sand control pipe 103, and is discharged from the medium outlet 1044 of the bottom seal 104. This structure can effectively simulate the formation and Completion features.

At the same time, the experimental medium discharged from the medium outlet 1044 is condensed and separated through the condenser 204 and the separator 203 of the circulation device, and the injection pump 201 provides the driving pressure of the medium. Then measure the internal pressure of the formation simulation device, the weight and flow rate of the experimental medium at the medium inlet 1011 and the medium outlet 1044 through the measuring device, and the data collected and displayed by the data acquisition and processing device 4 are displayed by each device. The above settings can simulate different well completion methods and sand control parameters (such as the temperature, pressure, flow rate of the experimental medium, artificial formation (coagulant type) and composition of the experimental medium, etc.), and then effectively evaluate the sand control pipe, inner cylinder support frame and outer tube. The performance of sand control components such as cylinder support frame.

It should be noted that the outer cylinder support frame 109 is used to support the experimental artificial formation 108 to ensure a certain distance between the outer wall of the outer cylinder support frame 109 and the inner wall of the kettle body 101 . Specifically, in some embodiments, evenly distributed holes are punched on the wall of the outer cylinder support frame 109 as filter holes, and the outer wall of the outer cylinder support frame 109 can be wrapped with a filter screen.

There is a certain distance between the inner cylinder support frame 106 and the sand control pipe 103 , forming an annular space 105 . A sealing cover 107 can be provided on its top.

In a specific embodiment, the bottom seal 104 includes a sand control fixing frame 1041 and an outlet pipe 1042. The sand control fixing frame 1041 is provided with an installation groove for inserting into the opening of the sand control pipe 103. The outlet pipe 1042 runs through the kettle body 101 and communicates with the installation groove at one end. , The other end communicates with the high-pressure pipeline 202 of the circulation device.

In order to further improve the tightness of the connection, a first sealing ring 1043 is provided between the outlet pipe 1042 and the kettle body 101 .

In addition, a pressure plate 1022 is provided at the bottom of the kettle lid 102 , and a second sealing ring 1023 is provided between the pressure plate 1022 and the kettle body 101 .

The first sealing ring 1043 and the second sealing ring 1023 can be O-rings, and of course, sealing rings with other cross-sectional shapes can also be selected.

During the experiment, an inner cylinder support frame 106 was placed between the sand control pipe 103 and the artificial formation 108 , and the inner cylinder support frame 106 was drilled from a stainless steel pipe body to support the artificial formation 108 . An outer cylinder support frame 109 is placed between the inner wall of the kettle body and the artificial formation 108. The outer cylinder support frame 109 is drilled by a stainless steel pipe body and is used to support the artificial formation 108. The sand control pipe 103, the inner cylinder support frame 106, the artificial The formation 108 and the outer cylinder support frame 109 are placed in sequence from the inside to the outside, and the upper cover of the device is used to press axially to compact the artificial formation. During the test, the inner wall support frame and the top of the sand control pipe 103 are sealed with the sealing cover 107, and the bottom of the sand control pipe 103 is sealed with the bottom of the device with the bottom seal 104.

The kettle cover 102 and the kettle body 101 can be detachably connected by a first screw 1021 . A second screw 1012 can be used for detachable connection between the inner cylinder support frame 106 and the kettle body 101 .

In a specific embodiment, the frame 120 adjusts the rotation angle of the kettle body 101 by rotating, and by selecting a frame 120 with a support surface with a different inclination angle, or adjusting the rotation angle between the kettle body 101 and the frame 120, the formation can be effectively controlled. The simulation device is at any angle, so that the rack can simulate horizontal wells, vertical wells, inclined wells and other wellbores at any angle. The formation simulation device can be put into the thermostat 130 as a whole to heat up, and a special hydraulic lifting mobile trolley is designed for entering and moving out of the thermostat 130, which can facilitate the lifting and relocation of the stratum simulation device.

The injection pump is mainly used to provide the injection pressure of the medium, supply the medium to the device at a certain constant pressure or constant flow rate, and simulate the production pressure difference or output of the formation; specifically, a constant speed and constant pressure pump can be selected, or a plunger pump or other Suitable for pump sets, etc. In some embodiments, the experimental medium adopts mechanical oil, the viscosity is from 5mPa·s to 600mPa·s, and the circulating high-pressure pipeline 202 adopts stainless steel seamless pipeline. After the oil flows out from the medium outlet 1044 of the device, the flow rate is measured by a high-temperature resistant flowmeter, and then After passing through the separator 203, the separated oil is recycled.

The measurement system mainly includes inlet flow metering system, outlet flow metering system and pressure detection system. The inlet flow metering system or outlet flow metering system is mainly composed of a weighing flow acquisition device. The experimental medium at the medium inlet is measured for flow and weight through the weighing flow acquisition device, and the experimental medium and sand particles at the medium outlet 1044 pass through the separator. For solid-liquid separation, the flow and weight of solid particles and liquid are measured respectively. Manual flow plus manual measurement means that a visible connecting pipe is designed on the separator 203, which can indicate the liquid level and sand level in the separator 203. The liquid storage tank is mainly used to collect the experimental medium after solid-liquid separation. The condenser 204 can cool the high-temperature experimental medium flowing out to room temperature. The condenser 204 is composed of a serpentine spiral tube and a water jacket, and the water jacket is circulated with cooling circulating water. The cleaning device is mainly used to clean the solid particles collected by the separator 203. It has the functions of oil washing cooking, throughput, overpressure, water cutoff, liquid level control, etc. It can automatically soak, automatically dry, and automatically control the temperature, and the oil washing speed is fast. ,efficient.

In a specific embodiment, the measuring device includes: a first pressure sensor 301 used to detect the pressure of the medium inlet 1011 of the kettle body 101, and/or used to detect the artificial formation between the inner cylinder support frame 106 and the outer cylinder support frame 109 The second pressure sensor 302 for pressure, and/or, the third pressure sensor 303 for detecting the pressure of the annulus 105 between the inner tube support frame 106 and the sand control pipe 103, and/or, the third pressure sensor 303 for detecting the outer wall of the sand control pipe 103 Four pressure sensors 304, and/or, a fifth pressure sensor 306 for detecting the pressure of the medium outlet 1044.

The pressure drainage tubes of the pressure sensors are installed on the formation simulation device, and the insertion positions of the pressure drainage tubes can be adjusted according to the needs, so that the insertion depth of the pressure drainage tubes can be adjusted. As shown in Figure 1, five sets of drainage pipes are designed, which can be respectively inserted into the medium inlet 1011 of the kettle body 101, the outer wall of the sand control pipe 103, the annular space 105, the artificial formation 108, and the medium outlet 1044 of the kettle body 101, and the medium can be measured. The pressure at the inlet 1011, the pressure on the outer wall of the sand control pipe 103, the pressure at a certain position in the inner annular space 105, the pressure in the artificial formation 108, and the medium outlet 1044. In particular, a filter head can also be designed at the head of the pressure drainage tube to prevent fine sand from flowing into the pressure drainage tube to block the drainage pipeline.

In addition, the circulation device also includes a preheating device for heating the experimental medium injected into the pump 201 . The heating speed of the test system is fast. The heating of the formation simulation device is not only designed with a constant temperature box 130 for heating, but also designed with an auxiliary heating preheating device, which can ensure that the required temperature is added within 2-3 hours.

Further, the measuring device may also include: a temperature sensor for measuring the temperature of the formation simulation device, the constant temperature box 130 and the preheating device. In some embodiments, for example, five Pt100 high-pressure temperature sensors are evenly arranged in the axial direction of the formation simulation device, with a temperature measurement range of 0° C. to 120° C. and an accuracy of 0.5%. It can be connected with computer network.

The measurement device also includes a weighing flow acquisition device 305 for measuring the internal pressure of the formation simulation device, the flow rate and weight of the experimental medium discharged from the medium inlet 1011 and the medium outlet 1044, and the discharged experimental medium flow is weighed and measured by the weighing flow acquisition device 305 Converted to achieve flow detection.

In a specific embodiment, there are multiple medium inlets 1011, and the multiple medium inlets 1011 are evenly distributed around the kettle body, and each medium inlet 1011 is provided with a valve for independently controlling the opening and closing of each medium inlet 1011. As shown in Fig. 1, eight medium inlets 1011 (not fully shown in the figure) are designed for the inlet of the formation simulation device, which can be fed simultaneously or selectively, and only need to open the corresponding valves.

The data acquisition and processing device 4 mainly includes: an acquisition system, acquisition control and processing software, a computer, a printer, and the like. Timely collection of pressure, temperature, liquid flow, feedback control injection pump pressure, start and stop. The data collected by the computer can be processed to generate original data reports, analysis reports and graphs, and at the same time generate database file formats for flexible use by users.

To sum up, the functions of the above-mentioned multifunctional sand control performance evaluation device for downhole formations include: it can carry out simulation tests of sand control effects under different sand control methods and sand control parameters, and study the sand output, flow rate, and sand control pipes under different sand control methods and sand control parameters. 103. The additional pressure drop inside and outside the support frame of the inner cylinder and the support frame of the outer cylinder (evaluate the anti-clogging ability of each sand control component), etc.; it can further realize the influence of temperature on sand production under different sand control methods and sand control parameters.

The multi-functional sand control performance testing method of downhole formations of the present utility model can simulate different formation characteristics, well completion methods and sand control parameters according to the multifunctional sand control performance evaluation device of downhole formations, and the performance of the outer cylinder support frame 109, the inner cylinder support frame 106 and the sand control pipe 103 Evaluation of sand control effect.

The multifunctional sand control performance evaluation device and method for downhole strata is based on the displacement mechanism and similarity principle, adopts advanced technology and control means, simulates formation pressure and temperature conditions, and uses the latest achievements of modern science and technology, such as computer technology, advanced sensor technology, automatic Control technology, etc., conduct physical simulation experiments.

The test content of this case mainly includes: evaluation of the anti-clogging ability, pressure difference, flow rate, sand output and sand control accuracy of the formation simulation device (outer cylinder support frame, inner cylinder support frame, and sand control pipe).

1. Flow rate: measure the relationship between flow rate and time, and evaluate the flow capacity of the outer cylinder support frame 109, the inner cylinder support frame 106, the sand control pipe 103 and the gravel layer;

2. Sand output: measure the relationship between sand output and time, analyze the impact of production pressure difference on sand output, and judge the sand retaining effect of outer cylinder support frame 109, inner cylinder support frame 106, sand control pipe 103 and gravel layer. The criteria for judging the sand control effect are: the less sand produced, the better the sand control effect; on the contrary, the more sand produced, the worse the sand control effect;

3. Pressure drop: Measure the internal and external pressure drop of the outer cylinder support frame 109, the inner cylinder support frame 106, and the sand control pipe 103 to judge the degree of blockage. The pressure drop of the outer cylinder support frame 109 is the difference between the first pressure sensor 301 and the second pressure sensor 302, the pressure drop of the inner cylinder support frame 106 is the difference between the second pressure sensor 302 and the third pressure sensor 303, and the sand control tube The pressure drop at 103 is the difference between the fourth pressure sensor 304 and the fifth pressure sensor 306;

4. Measurement of the particle size of the produced sand: analyze the particle size of the produced sand, and evaluate the sand-retaining accuracy and sand-control effect of the outer cylinder support frame 109, the inner cylinder support frame 106, the sand control pipe 103 or the gravel layer;

5. Temperature: Measure the relationship between temperature and sand production, and evaluate the influence of temperature changes on sand production.

The multifunctional sand control performance evaluation device for downhole formations provided in this case has the following technical features:

1. Simulate different completion methods and sand control parameters such as injection flow rate, injection pressure, and flowing pressure difference, and the overall evaluation experiment of the outer cylinder support frame 109, inner cylinder support frame 106, and sand control pipe 103 at different temperatures.

2. The three-dimensional radial flow screen simulation experiment device can simulate the slow sand production process of the reservoir, so as to study the blockage and sand production of the outer cylinder support frame 109, the inner cylinder support frame 106, and the sand control pipe 103.

3. Regardless of the porosity and permeability characteristics of the reservoir, only the clogging mechanism of the outer cylinder support frame 109, the inner cylinder support frame 106, and the sand control pipe 103 is studied, and the test process is simplified to quickly obtain regularity.

4. The pressure realizes multi-channel detection, which can detect the fluid inlet pressure, the pressure of the annular space 105, the pressure of the artificial formation 108 and the pressure of the outer wall of the sand control pipe 103.

5. Pressure measurement is designed with a pressure drainage tube, the position of the drainage tube in the sand layer can be adjusted according to the needs, and the insertion depth of the pressure drainage tube can be adjusted.

6. The heating speed of this system is fast. In addition to the heating of the formation simulation device, it is designed with a constant temperature box 130 for heating, and is also designed with an auxiliary heating, which can ensure rapid heating to the required temperature.

7. The separator 203 is also designed with a liquid level visual communication pipe, which can indicate the liquid level and sand level in the separator 203.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples are used to illustrate the principle and implementation of the present utility model, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall into the protection of the claims of the utility model. within range.

Claims (10)

1. A downhole formation multifunctional sand control performance evaluation device, characterized in that it comprises: a formation simulation device, a circulation device, a measuring device and a data acquisition and processing device; The formation simulation device includes a frame, a kettle body, a kettle cover, an outer cylinder support frame, an inner cylinder support frame, a sand control pipe, a bottom seal and a constant temperature box; the frame is used to support the kettle body, and the kettle body The body is a cylindrical structure with an open top, the open end of the kettle body is detachably connected to the kettle cover, and several filter holes are opened on the outer cylinder support frame, the inner cylinder support frame and the sand control pipe. , the kettle body, the outer cylinder support frame, the inner cylinder support frame and the sand control pipe are set sequentially from the outside to the inside, and the two ends of the outer cylinder support frame are respectively connected to the kettle cover and the kettle The bottom of the body is connected, and a medium cavity for filling the experimental medium to be mined is formed between the outer cylinder support frame and the kettle body, and the space between the outer cylinder support frame and the inner cylinder support frame is used for filling simulation. An artificial formation with formation characteristics under well completion conditions, the kettle body is provided with a medium inlet communicating with the medium cavity, the bottom seal is provided with a medium outlet for discharging the experimental medium, and the inner cylinder support frame is used for For simulating the pipe wall used in different completion methods, when simulating the open hole completion method, remove the inner tube support frame; The circulation device includes an injection pump, a separator for separating the medium, and a condenser. The injection pump supplies the medium to the medium inlet of the formation simulation device through a high-pressure pipeline, and the medium outlet of the formation simulation device passes through a high-pressure pipeline. Connecting the condenser and the separator in turn; The measuring device is used to measure the internal pressure of the formation simulation device, the weight and flow rate of the medium inlet and medium outlet experimental medium; The data collection and processing device is used for collecting and displaying the data of the formation simulation device, the circulation device and the measurement device. 2. The multifunctional sand control performance evaluation device for downhole formations according to claim 1, wherein the bottom seal includes a sand control fixing frame and a lead-out pipe, and the sand control fixing frame is provided with an opening for embedding the sand control tube The outlet pipe runs through the kettle body and communicates with the installation groove at one end, and communicates with the high-pressure pipeline of the circulation device at the other end. 3. The downhole formation multifunctional sand control performance evaluation device according to claim 2, characterized in that a first sealing ring is arranged between the outlet pipe and the kettle body; And/or, the bottom of the kettle cover is provided with a pressure plate, and a second sealing ring is provided between the pressure plate and the kettle body. 4. The downhole formation multi-functional sand control performance evaluation device according to claim 1, characterized in that, when the perforation completion method is adopted, the inner cylinder support frame is a perforation support frame with blastholes; When the liner pipe completion method is adopted, the inner barrel support frame is a liner pipe support frame; When gravel packing is used to complete the well, the inner cylinder support frame includes an inner and outer ring-shaped inner layer and an outer ring-shaped layer, both of which are screen-like structures with a gap between them. Filled with gravel. 5. The downhole formation multifunctional sand control performance evaluation device according to claim 1, wherein the measuring device comprises: a first pressure sensor for detecting the medium inlet pressure of the kettle body, and/or, using a second pressure sensor for detecting the artificial formation pressure between the inner cylinder support frame and the outer cylinder support frame, and/or a second pressure sensor for detecting the annular pressure between the inner cylinder support frame and the sand control pipe The third pressure sensor, and/or the fourth pressure sensor used to detect the outer wall of the sand control pipe, and/or the fifth pressure sensor used to detect the medium outlet pressure of the bottom seal. 6 . The downhole formation multifunctional sand control performance evaluation device according to claim 1 , wherein the circulation device further comprises a preheating device for heating the experimental medium injected into the pump. 7 . 7. The downhole formation multi-functional sand control performance evaluation device according to claim 6, characterized in that, the measuring device comprises: a temperature for measuring the temperature of the formation simulation device, the thermostat and/or the temperature of the preheating device sensor. 8. The downhole formation multi-functional sand control performance evaluation device according to claim 1, characterized in that the measuring device comprises: a weighing flow collection device for measuring the flow and weight of the experimental medium discharged from the medium outlet. 9. The downhole formation multi-functional sand control performance evaluation device according to claim 1, characterized in that, the number of the medium inlets is multiple, and a plurality of the medium inlets are evenly distributed around the kettle body, each The medium inlets are provided with valves for independently controlling the opening and closing of each medium inlet. 10. The downhole formation multi-functional sand control performance evaluation device according to claim 1, characterized in that, the kettle cover and the kettle body are detachably connected by a first screw, and/or the inner cylinder supports The frame and the kettle body are detachably connected by a second screw rod.

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