RU48582U1 - DEVICE FOR COLLECTING THE MATERIAL TESTED WITH SIMULTANEOUS CLEANING OF WELL BOTTOM AND BOTTOM ZONE - Google Patents

Abstract

The proposed utility model relates to equipment used in the oil and gas industry, namely, devices for sampling and studying the composition of wells and can be used for simultaneous cleaning of the bottom-hole zone of the formation and the bottom of the wells from the material under study, and specifically - mechanical impurities, sediments and sludge traffic jams, foreign objects, etc.

The technical task of the utility model is to remove accumulated deposits and sediment from the bottom of the well, collect the entire volume of extracted material and the possibility of ensuring its “archiving”, take samples and study them, as well as increase the efficiency and speed of cleaning the bottom-hole formation zone and the bottom of the well.

A device for collecting the test material while cleaning the bottom of the well and the bottom hole in the test well with the tubing string contains a filter in series, a check valve, a throttling chamber, a bypass device with a shear pin, containers for the test material, a relief valve and a pressure relief valve .

What is new is that sections of the tubing string serve as containers for collecting the test material.

New is the fact that the selection of the studied material as a result of using the utility model occurs with the possibility of obtaining high-quality and reliable information about the finely and coarse-grained composition of the sample, due to the fact that the containers are located in the areas of the most intensive sampling by composition.

Also new is the fact that the selection of the test material is carried out not only from the well, but also from the bottomhole formation zone, thereby ensuring the representativeness of the sample.

The application of the claimed utility model will provide:

- the possibility of "archiving" of mechanical impurities, sludge and sand and lifting them from the well, ensuring the safety of the test material;

- control of physicochemical parameters of the liquid leaving the well and study of the content and composition of mechanical impurities;

- receipt of large volumes of precipitation, ensuring the representativeness of the test sample, i.e. its reliability;

- regulation of the flow rate of the well fluid from the high-pressure region to the low-pressure region;

- simplifying the design and increasing the efficiency and speed of cleaning the bottom-hole formation zone and the bottom of the well;

- reduction in the number of repair work during routine maintenance, which will allow to more fully comply with environmental protection requirements;

- reduction of labor costs when cleaning the bottom-hole formation zone and the bottom of the well from deposited and non-washed away impurities and sediments.

These advantages of the device for collecting the studied material while cleaning the bottom of the well and the bottomhole zone are achieved due to such distinguishing features as:

- the capacity of the containers for the test material increases to the size of the entire suspension of the tubing;

- smooth and uniform filling of the container with mechanical impurities;

- controllability of the filling process: when the device is slightly raised, its operation stops, when it is lowered, the work on cleaning the bottom-hole formation zone and the bottom of the well continues,

- mechanical impurities removed from the bottomhole zone and settled in the device containers do not re-participate in the creation of a hydraulic

resistance to the flow of the borehole fluid, thereby improving the reservoir properties of the bottomhole formation zone.

A device for collecting the studied material with simultaneous cleaning of the bottom of the well and the bottom hole accelerates the collection and conduct of research, increases their accuracy and, thereby, allows to increase the coverage of the study and reasonably carry out measures to reduce the technogenic load on the environment.

A device for collecting the test material with simultaneous cleaning of the bottom of the well and the bottomhole just for manufacturing and installation, reliable in operation, does not require qualified maintenance and does not depend on other technical and technological factors, i.e. A steady positive effect is achieved.

Description

The proposed utility model relates to equipment used in the oil and gas industry, namely, devices for sampling and studying the composition of well sediments and can be used for simultaneous cleaning of the bottom-hole zone of the reservoir and the bottom of the wells from the material being studied, and, specifically, mechanical impurities, sediments and sludge, sediment and foreign objects.

Prerequisites for creating a utility model.

Analysis of the current level of technology in this field showed the following:

To conduct studies to determine the composition of the sediment that accumulates at the bottom of the wells, two methods are currently used mainly.

1. Sampling of sediment during flushing of the bottom of the well.

2. Sampling by descent of deep samplers on a cable.

Both of these methods have significant disadvantages that do not allow to obtain reliable information about the composition of the sediment.

Sampling during washing of the bottom does not give a complete picture of the fractional composition of deposits due to the fact that when washing, smaller particles are carried out first, and then larger ones. A significant part of the fine-grained material (sand and silt-like particles) is not captured by the filters used, and most of them do not fall into the sample at all.

In addition, due to uneven sediment removal, it is impossible to determine the true ratio of fine-grained and coarse-grained sediment material, since everything is washed out intensively from the bottom of the well.

The method requires a large expenditure of energy resources and the creation of pressure by powerful units on the surface for injection into the well.

Sampling with deep samplers allows you to take samples from the surface layer of sediments, which does not allow us to judge the composition of all sediments from the upper part of the sediment to the bottom.

A significant disadvantage of this method is also cable breakage and the difficulty of removing deposits having high density, viscosity and adhesion to the pore surface of the rock from the bottomhole formation zone, which leads to insufficient cleaning of the formation pores in the bottomhole zone from accumulated contaminants.

A device is known comprising a flow meter lowered into a well on a cable with a liquid displacer fixed to the cable flow meter above the cable. The displacer is made in the form of a column of cylindrical elements strung on a cable and connected to each other, RF Patent No. 2158366, IPC class E 21 V 47/00, “Device for researching wells”

As a result of the analysis of the known design, the following disadvantages should be noted:

- a limited range of applications and low economic efficiency due to the significant costs of lowering downhole equipment, a large consumption of electrical energy;

- limited functionality, due to the fact that this device is difficult to use in facilities requiring the receipt of a large amount of slurry and mud deposits in it;

- significant operating costs and the complexity of maintenance associated with the complexity of the design.

A solution is known aimed at sealing the sample by planting the tool on the face, containing a multi-chamber sampler with a fluid well, lowered in the drill string and containing a number of sections having a receiving chamber and a receiving and locking valve with an electric igniter. (Aut. USSR Certificate No. 575413, IPC class E 21 B 49/02.)

A disadvantage of the known device is the low reliability of the samples taken.

In terms of common features and the principle of operation, the closest in technical essence to the proposed device is a multi-chamber well fluid sampler, lowered in a drill string, containing a number of sections with a receiving chamber, a receiving and locking valve with an electric igniter. The sampler is equipped with a switching unit, a supply and two receiving electrodes connected to the switch, a threshold unit and fixing bolts with channels, while the output of the threshold unit through the switching unit is connected to electric igniters, and the receiving chambers are connected to the annulus using fixing bolts (Aut. USSR Certificate No. 1154443, IPC Class E 21 B 47/00 “Multi-chamber sampler of well fluid”).

Significant disadvantages of the known device are:

- the complexity of the design, which means low operational reliability;

- low reliability;

- significant operating costs and the complexity of maintenance.

The technical task of the utility model is to remove accumulated deposits and sediment from the bottom of the well, collect the entire volume of extracted material and the possibility of ensuring its “archiving”, take samples and study them, as well as increase the efficiency and speed of cleaning the bottom-hole formation zone and the bottom of the well.

The formulated technical problem is solved by the proposed device for collecting the investigated material while cleaning the bottom of the well and the bottomhole zone.

A device for collecting the test material while cleaning the bottom of the well and the bottom hole in the well with the string of tubing contains a filter in series, a check valve, a throttling chamber, a bypass device

with shear pin, containers for the material to be studied, relief valve and pressure relief valve.

The fundamental difference from the existing types of devices is the use of a throttling chamber installed directly at the bottom of the well and allowing maximum use of the energy of the hydrostatic column of the borehole fluid using a throttle that regulates the fluid flow during sampling of the studied material and cleaning.

Sampling is carried out evenly, resulting in a better sampling (the test material is not mixed).

What is new is that sections of the tubing string serve as containers for collecting the test material.

New is the fact that the selection of the studied material as a result of using the utility model occurs with the possibility of obtaining high-quality and reliable information about the finely and coarse-grained composition of the sample due to the fact that the containers are located in the areas of the most intensive sampling by composition.

Also new is the fact that the selection of the test material is carried out not only from the well, but also from the bottomhole formation zone, thereby ensuring the representativeness and reliability of the sample.

A device for collecting the studied material while cleaning the bottom of the well and the bottomhole zone has the following design and is illustrated in the drawing, where:

Figure 1 shows this device.

A device for collecting the test material while cleaning the bottom of the well and bottom hole in the test well 1 with a string of tubing 2 contains a filter 3 connected in series, a check valve 4, a throttling chamber 5, a bypass device 6 with a shear pin, containers for the test material 7 located in the areas of the most intensive sampling by composition

(zone I - large, zone II - medium, zone III - fine materials), a knock-off valve 8 and a pressure relief valve 9.

A device for collecting the test material while cleaning the bottom of the well and the bottomhole zone works as follows:

The device descends to the bottom of the investigated well 1 on the layout of the tubing string (tubing) 2 (figure 1).

When a device for collecting the test material is planted while simultaneously cleaning the bottom of the well and the bottomhole zone, the shear pin of the bypass device 6 is cut off and a message opens with the internal cavity of the tubing 2, and the actuation mechanism of the throttling chamber 5 is activated. The check valve 4 opens, and As a result of the created vacuum, the well fluid with sediments is sucked into the tubing 2. The filling rate of the tubing 2 is regulated by the throttling chamber 5. The duration of continuous exposure to the bottom-hole formation zone and the bottom of the well depends on the difference in the static fluid level inside the tubing 2 and the well under investigation 1. The borehole fluid fills the throttling chamber 5. Bypass holes (not shown in Fig.) Are connected with containers of the investigated material 7 and, due to the difference in hydrostatic pressure, precipitation and mechanical impurities rise upward, passing through the filter 3.

After pressure equalization, the check valve 4 closes, mechanical impurities and sediments entrained by the flow of the well fluid in the tubing 2 remain locked in the containers of the test material 7. The volume of the containers 7 is transformable, and is selected based on the estimated volume of sediment accumulated at the bottom of the well.

The pressure in the containers of the investigated material 7, located in zones I, II, III, is equalized by a pressure relief valve 9, providing control of the process of collecting precipitation and safety when lifting the device. The knock-off valve 8 is necessary to drain excess well fluid from the containers of the test material 7 when lifting the device.

The throttling chamber 5 is designed for uniform, smooth movement of the borehole fluid with mechanical impurities, in which there is no mixing of sediments, as a result of which volumetric filling and sampling is more efficient, and the samples are better and more representative. When using the throttle chamber 5 of the device, there is no sharp shock method of filling the containers 7, as a result of which there is a high-quality cleaning of the bottom-hole zone of the formation and the bottom of the well.

To use the effective parameters of the device, the optimal pressure difference is the selection of the optimal diameter of the throttling chamber 5.

The application of the claimed utility model will provide:

- the possibility of "archiving" of mechanical impurities, sludge and sand and lifting them from the well, ensuring the safety of the test material;

- control of physico-chemical parameters of the outlet well fluid and study of the content and composition of mechanical impurities;

- receipt of large volumes of precipitation, ensuring the representativeness of the test sample, i.e. its reliability;

- regulation of the flow rate of the well fluid from the high-pressure region to the low-pressure region;

- simplifying the design and increasing the efficiency and speed of cleaning the bottom-hole formation zone and the bottom of the well;

- reduction in the number of repair work during routine maintenance, which will allow to more fully comply with environmental protection requirements;

- reduction of labor costs when cleaning the bottom-hole formation zone and the bottom of the well from deposited and non-washed away impurities and sediments.

These advantages of the device for collecting the studied material while cleaning the bottom of the well and the bottomhole zone are achieved due to such distinguishing features as:

- the capacity of the containers for the test material increases to the size of the entire suspension of the tubing;

- smooth and uniform filling of containers located in areas of the most intensive sampling by composition with mechanical impurities;

- controllability of the filling process: when the device is slightly raised, its operation stops, when it is lowered, the work on cleaning the bottom-hole formation zone and the bottom of the well continues,

- mechanical impurities removed from the bottom-hole zone and settled in the device containers do not re-participate in creating hydraulic resistance to the flow of the well fluid, thereby improving the reservoir properties of the bottom-hole formation zone.

A device for collecting the studied material with simultaneous cleaning of the bottom of the well and the bottom hole accelerates the collection and conduct of research, increases their accuracy and, thereby, allows to increase the coverage of the study and reasonably carry out measures to reduce the technogenic load on the environment.

A device for collecting the test material with simultaneous cleaning of the bottom of the well and the bottomhole just for manufacturing and installation, reliable in operation, does not require qualified maintenance and does not depend on other technical and technological factors, i.e. A steady positive effect is achieved.

Claims (1)

A device for collecting the test material while cleaning the bottom of the well and the bottomhole zone, including the test well with a filter installed on the tubing string, a check valve, a bypass device with a shear pin, containers for the test material, a knockdown valve and a pressure relief valve, characterized in that it contains a throttling chamber installed directly at the bottom of the well with the possibility of using the energy of the hydrostatic column of the borehole fluid ty for regulating the process of sampling the test material and cleaning, and sections of the tubing string are containers for the test material, with the possibility of obtaining high-quality and reliable information about the fine and coarse-grained composition of the sample taken, with the selection of the test material from the well and the bottomhole formation zone .