CN104514524A - Spiral sand remover - Google Patents

Abstract

The invention provides a spiral desander, which includes a spiral separation pipe, a short joint of a sand outlet, a replacement sand storage tank and a mounting frame for the spiral separation pipe. The liquid outlet at the upper end is connected to the water collection pipeline on the ground. There are several blocking sand outlets on the outer peripheral surface of the spiral separation pipe. There is a sand discharge port; the sand-containing reverse discharge liquid at the bottom of the well enters from the feed port at the lower end of the spiral separation pipe, and flows upward along the spiral separation pipe at a high speed. Under the action of centrifugal force, the sand in the reverse discharge liquid is thrown to the inner wall of the spiral separation pipe The outer peripheral surface is discharged into the replacement sand storage tank from the sand outlet. The spiral separation pipe is airtightly connected with the replacement sand storage tank, and the pressure is balanced. The sand is discharged into the replacement sand storage tank by centrifugal force to replace the liquid in it. The outlet at the upper end is discharged into the ground water collection pipeline to realize the separation of sand and liquid.

Description

A spiral desander

technical field

The invention relates to a sand-liquid separation device, in particular to a spiral desander.

Background technique

At present, a new type of hydraulic sand blasting perforation, fracturing, blowout, well flushing and suction is used in the oil field when completing wells. In these processes, the flowback fluid must be treated. The existing flowback fluid fracturing treatment system has the following two treatment technologies: 1. Use the grit settling tank for natural settlement treatment: although this separation technology can solve the flowback However, the settling and separation takes too long, which prolongs the completion period; and the settling tank has a large volume and occupies a large area, so it is not suitable for use in a skid-mounted system with a small volume middle. 2. Cyclone separation technology: Although the separation technology equipment is small in size, its processing capacity is insufficient. The separation and treatment of fracturing fluid with large flow rate and high sand content requires multiple sets of equipment, which increases the investment cost.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art and provide a spiral desander with simple structure, which can dynamically separate the flowback liquid with large flow rate and high sand content.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A spiral desander, including a spiral separation pipe, a short joint at the sand outlet, a replacement sand storage tank, and a mounting frame for the spiral separation pipe. It is connected with the ground water collection pipeline, and several sand outlet joints are installed on the spiral separation pipe. The sand outlet on the sand outlet joint is connected with the replacement sand storage tank through the pipeline, and the bottom of the replacement sand storage tank is provided with a Sand discharge outlet; the sand-containing flowback liquid at the bottom of the well enters from the feed inlet at the lower end of the spiral separation tube, and flows upwards along the spiral separation tube. The blocked sand outlet in the section is discharged into the replacement sand storage tank and the liquid in it is replaced, and the separation liquid is discharged from the upper outlet of the spiral separation pipe into the ground water collection pipeline.

The spiral separating pipe is composed of several segmented spiral pipes and several short joints of the sand outlet connecting the segmented spiral pipes.

The spiral separation pipe is wound in sections, each section has a certain angle of rise and radius of gyration, and the gyration angle exceeds 180°. There are flanges, and each segmented spiral pipe is connected with the short joint of the sand outlet through the flange.

A baffle for gathering sand particles is provided at the sand outlet on the outer side of the inner wall of the sand outlet nipple, and the baffle is a U-shaped baffle or an inverted L-shaped baffle that is preset on the inner wall of the sand outlet nipple.

The replacement sand storage tank is a closed pressure tank on which a pressure gauge for measuring the pressure inside the tank is installed.

Flanges and valves are connected to the feed inlet at the lower end of the spiral separation pipe and the liquid outlet at the upper end, and the feed inlet and liquid outlet of the spiral separation pipe are respectively connected to the liquid return pipeline at the bottom of the well and the ground collection through the flange and the valve. Water line connection.

A sand discharge valve is installed on the sand discharge port at the bottom of the replacement sand storage tank.

A valve is installed on the connection pipeline between each sand outlet nipple on the spiral separation pipe and the replacement sand storage tank.

In the present invention, several short joints of the sand outlet are installed on the body of the spiral separation pipe, and each short joint of the sand outlet is connected to the replacement sand storage tank through pipelines, and the sand-liquid mixture enters from the feed port at the lower end of the spiral separation pipe. Flow upwards along the spiral separation pipe, and the sand particles are thrown to the outer peripheral surface of the spiral separation pipe by centrifugal force, and are discharged into the replacement sand storage tank from the sand outlet on the sand outlet nipple, and the pressure balance between the spiral separation pipe and the replacement sand storage tank , with the help of centrifugal force, the sand is discharged into the replacement sand storage tank to replace the liquid in it, and the liquid is discharged from the upper outlet of the spiral separation pipe into the ground water collection pipeline to realize the separation of sand and liquid.

The invention can dynamically separate the sand-liquid two-phase flowback liquid with high sand content and large flow rate, and has higher working efficiency than the traditional sedimentation treatment method. The desander has simple structure, small equipment volume and high working reliability; Compared with the cyclone separation device, the invention has a smaller volume and a larger processing capacity, thereby ensuring the smooth progress of well completion operations, shortening the production period, and improving the comprehensive benefits of the oil field.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention;

Accompanying drawing 2 is the schematic diagram of the assembly of the spiral separation pipe and the short joint of the sand outlet; Fig. 2a is the main view; Fig. 2b is the left view; Fig. 2c is the top view;

Accompanying drawing 3 is the schematic diagram of the short joint of sand outlet; Figure 3a is the front view; Figure 3b is the axial sectional view; Figure 3c is the radial sectional view;

In the figure: 1. Spiral separation pipe; 2. Short joint of sand outlet; 201. Baffle plate; 3. Sand outlet; 4. Pressure gauge; 5. Replacement sand storage tank.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to accompanying drawing 1, the spiral desander of the present invention is mainly composed of a spiral separation pipe 1, a sand outlet nipple 2, an installation frame and a replacement sand storage tank. The feed inlet at the lower end of the spiral separation pipe 1 is connected to the liquid return pipeline at the bottom of the well through flanges and valves, and the outlet at the upper end of the spiral separation pipe 1 is connected to the ground water collection pipe through flanges and valves. The sand port nipple 2, each sand outlet 3 is connected with the replacement sand storage tank 5 through pipelines, the bottom of the replacement sand storage tank 5 is provided with a sand discharge outlet, and a sand discharge valve is installed on the sand outlet pipeline, and the replacement sand storage tank 5 is A pressure gauge 4 for measuring the pressure in the tank is also installed.

When working, the sand-liquid mixture enters from the feed inlet at the lower end of the spiral separation tube 1, and spirals upwards along the spiral separation tube 1. The replacement sand storage tank 5 is replaced with the liquid in the replacement sand storage tank 5, and the liquid is discharged from the upper outlet of the spiral separation pipe 1 into the ground water collection pipeline to realize the separation of sand grains and liquid.

Further, as shown in Figure 2, it is a schematic diagram of the assembly of the spiral separation pipe and the sand outlet nipple; Figure 2a is a front view; Figure 2b is a left view; Figure 2c is a top view; the spiral separation pipe 1 is separated by a segmented spiral The pipe is connected with several short joints 2 of the sand outlet, and the outer peripheral surface of each short joint 2 of the sand outlet is provided with a sand outlet 3, and each sand outlet 3 is connected with the replacement sand storage tank 5 through the pipeline, and each sand outlet A valve is installed on the connecting pipeline between the mouth 3 and the replacement sand storage tank 5, and each segmented spiral tube has a certain elevation angle and a certain turning radius, and the turning angle exceeds 180°, and the two ends of each segmented spiral tube and Both ends of the short joint 2 of the sand outlet are butt-welded with flanges, and the segmented spiral pipe is connected with the short joint 2 of the sand outlet through flanges. The spiral separation tube is a multi-section segmented spiral tube, which is convenient for processing and transportation.

Further, as shown in Figure 3, Figure 3 is a schematic diagram of the sand outlet sub-joint; Figure 3a is a front view; Figure 3b is an axial sectional view; Figure 3c is a radial section view; 3 A baffle plate 201 for gathering sand particles is provided. The baffle plate is arranged behind the sand outlet 3, and plays a blocking role when the sand particles flow through, and gathers the sand particles near the sand outlet. 2 U-shaped baffle or inverted L-shaped baffle on the inner wall.

Before the desander operation starts, connect the inlet and outlet of the desander, and switch the number of valves between the desander and the replacement sand storage tank according to the flow rate. Open the bottom hole flowback fluid valve, let the flowback fluid enter the spiral separation pipe, and start the sand removal operation. The sand-liquid mixed flow spirals upward at high speed in the spiral separation pipe, and the sand particles are thrown to the outside of the spiral separation pipe under the action of centrifugal force, and the sand particles are gathered and guided to the replacement sand storage tank by the sand collection structure of the sand outlet joint. The sand is replaced by the liquid in the replacement sand storage tank, and temporarily stored in the replacement sand storage tank until the sand removal operation is completed, and the sand discharge valve at the bottom of the replacement sand storage tank is opened to empty the tank.

Claims (8)

1. a spiral desander, it is characterized in that: comprise spiral separation pipe (1), sand export pipe nipple (2), displacement sand tank (5) and spiral separation pipe installing rack, spiral separation pipe (1) lower end charging aperture returns liquid pipeline with shaft bottom and is connected, spiral separation pipe (1) upper end outlet and the ground pipeline that catchments is connected, described spiral separation pipe (1) is provided with several sand export pipe nipples (2), sand export (3) on sand export pipe nipple (2) is communicated with displacement sand tank (5) by pipeline, displacement sand tank (5) bottom offers sand removing hole, shaft bottom is returned discharge opeing containing sand and is entered from spiral separation pipe (1) lower end charging aperture, spiral along spiral separation pipe (1) and upwards flow, sand grains is thrown toward spiral separation pipe (1) outer peripheral face under the influence of centrifugal force, enter displacement sand tank (5) from the blocking type sand export (3) in sand export pipe nipple (2) to replace with the liquid in it, parting liquid enters ground from spiral separation pipe (1) upper end outlet and to catchment pipeline.

2. spiral desander according to claim 1, is characterized in that: described spiral separation pipe (1) is made up of with several sand export pipe nipples (2) being connected each segmentation helix tube several segmentation helix tubes.

3. spiral desander according to claim 2, it is characterized in that: described spiral separation pipe (1) is segmentation coiling, each segmentation has certain lift angle, the radius of gyration, and angle of revolution is all more than 180 °, each segmentation helix tube two ends and sand export pipe nipple (2) two ends are all welded with flange, and each segmentation helix tube and sand export pipe nipple (2) pass through Flange joint.

4. spiral desander according to claim 2, it is characterized in that: described sand export pipe nipple (2) inner wall outside sand export (3) place is provided with assembles the baffle plate (201) of sand grains, described baffle plate (201) is for being preset in U-shaped baffle plate on sand export pipe nipple (2) inwall or inverted L shape baffle plate.

5. spiral desander according to claim 1, is characterized in that: described displacement sand tank (5) is closed pressurized tank, it is provided with the pressure meter (4) measuring pressure in tank.

6. spiral desander according to claim 1, it is characterized in that: described spiral separation pipe (1) lower end charging aperture and liquid outlet place, upper end are all connected with flange and valve, spiral separation pipe (1) charging aperture and liquid outlet all return liquid pipeline and the ground pipeline that catchments respectively by flange, valve and are connected with shaft bottom.

7. spiral desander according to claim 5, is characterized in that: described displacement sand tank (5) bottom sand removing hole is provided with sediment outflow valve.

8. spiral desander according to claim 1, is characterized in that: the upper each sand export pipe nipple (2) of described spiral separation pipe (1) and the connecting line of displacement sand tank (5) are provided with valve.