CN221896574U - Sand control device suitable for gas field downhole choke ware - Google Patents

Abstract

The utility model provides a sand control device suitable for an underground throttle of a gas field, and particularly relates to the technical field of underground development of oil and gas fields. The utility model provides a be applicable to gas field downhole choke sand control device, includes choke and sand control device, and the choke upper end includes delivery head, fishing head and drainage sliding sleeve, and the choke lower extreme includes packing element and sand control device. The utility model has the beneficial effects that: the design improves the sand prevention device of the underground throttle, improves the sand filtering effect, and reduces the blocking risk of the sand prevention device. The sand control net is designed into a capsule, sand grains with different diameters can be secondarily filtered, the filtering efficiency is greatly improved, the sand control net at the lower part is designed into a convex surface, and the sand grains with larger diameters are primarily filtered. The gas-liquid and smaller sand grains can flow into the sand control net from the top pores, a part of sand grains can be embedded into the inner wall grooves of the sand control net, the upper sand control net is designed to be concave, and the smaller sand grains are subjected to secondary filtration to improve the filtering effect.

Description

A sand prevention device suitable for downhole chokes in gas fields

Technical Field

The utility model mainly relates to the technical field of underground development of oil and gas fields, in particular to a sand prevention device suitable for underground throttles in gas fields.

Background Art

In the field of underground mining of oil and gas fields, the underground choke is a key production control equipment, and the choke sand control device is an important part to ensure its normal operation. It usually acts underground to adjust the flow rate and flow of gas and liquid, effectively control the production, ensure the stable production of oil and gas wells, and maximize the recovery rate. In oil and gas wells, the main function of the underground choke sand control device is to prevent underground sand and other particles from entering the choke and the ground pipe network, avoiding blockage of the choke and wear of the wellhead equipment.

The throttle is usually installed at about 1,800 meters underground for natural gas recovery. Because the working pressure difference between the upstream and downstream of the throttle is relatively large, the gas and liquid carry the sand from the bottom of the well upward. It is necessary to add a sand prevention device at the bottom of the throttle to prevent more sand from entering the throttle or downstream. The existing throttle sand prevention device is usually only equipped with a single-layer sand prevention net, and the number of sand prevention meshes is relatively small, resulting in relatively poor filtering effect for fine sand particles, causing more sand particles to enter the throttle or downstream pipelines, accelerating equipment wear, increasing maintenance costs, and reducing equipment life. It is easy to cause the performance of the sand prevention device to decline, and may even cause the throttle to be blocked. The structural design of the existing sand prevention device is difficult to replace, which will lead to an extension of the maintenance cycle and waste a lot of resources. Therefore, the utility model provides a sand prevention device suitable for throttles underground in gas fields.

Utility Model Content

In order to address the deficiencies in the prior art, the utility model provides a sand control device suitable for a throttle downhole in a gas field. The design can greatly improve the sand control effect by changing the structure of the sand control device. In application, the throttle life can be extended and the failure rate of the throttle being difficult to unseal due to throttle blockage by sand particles can be reduced.

In order to achieve the above-mentioned purpose, the utility model is realized through the following technical solutions:

A throttle sand control device suitable for gas field downholes, comprising a throttle and a sand control device, wherein the upper end of the throttle comprises a delivery head, a fishing head and a drainage sliding sleeve, the lower end of the throttle comprises a rubber cylinder and a sand control device, the sand control device comprises an upper sand control seat, a lower sand control seat and a sand control net, the tail of the throttle is connected to the upper sand control seat, the sand control net is arranged between the upper sand control seat and the lower sand control seat, and the upper sand control seat and the lower sand control seat are connected by threads for fixing the sand control net.

The sand prevention device is fixed to the tail of the throttle through threaded connection.

The sand-proof net is in capsule style, the bottom of the sand-proof net is designed to be U-shaped, and the inner wall of the sand-proof net is provided with irregular grooves.

The lower end of the sand-proof net is set to 50 meshes, and the upper end of the sand-proof net is set to 90 meshes.

The sand control net can be disassembled and replaced.

Compared with the prior art, the beneficial effects of the utility model are:

This design makes innovative improvements to the downhole choke sand control device, aiming to improve the sand filtering effect and reduce the failure rate of the choke being difficult to unseal due to sand blockage. In the new design, the sand control net is re-conceived as a capsule type, which can perform secondary filtration on the gas-liquid mixture and sand. The lower sand control net adopts a convex design with a mesh size of 50, which is mainly used to filter sand with larger diameters, effectively reducing the risk of clogging the sand control net. The gas-liquid mixture will flow into the sand control net through the top pores. In order to enhance the sand control effect, the inner wall material of the sand control net is different from the main material, and irregular grooves are set on the inner wall, which helps to embed some fine sand. Subsequently, the gas-liquid mixture is secondary filtered through the upper 90-mesh concave sand control net, which effectively filters sand with smaller diameters and significantly reduces the risk of clogging of the sand control device. The design of the capsule sand control net takes into account the convenience of replacement and avoids waste. The sand control device with a relatively simple structure not only extends the life of the choke, but also reduces maintenance costs. Overall, this innovative design brings higher reliability and operability to the sand control system of the downhole choke. The double-layer filtration design greatly improves the sand control effect, making it more suitable for complex sediment conditions in gas field environments.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a front view of the utility model;

Figure 2 is a schematic diagram of the structure of the utility model sand control net

FIG3 is a partial structural schematic diagram of the utility model.

Figure 4 is a schematic diagram of the overall structure of the sand control device of the utility model

The numbers shown in the accompanying drawings are: 1. throttle; 2. sand control device; 3. delivery head; 4. fishing head; 5. drainage sliding sleeve; 6. slip; 7. rubber cylinder; 8. upper sand control seat; 9. lower sand control seat; 10. sand control net; 11. gully.

DETAILED DESCRIPTION

The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.

The standard parts used in the present invention can all be purchased from the market, special-shaped parts can be customized according to the description in the specification and the drawings, and the specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, and bonding in the prior art. At the same time, in order to clearly express the connection relationship and working principle between the various components, the drawings in the specification are organized and drawn in the form of simple diagrams of the mechanism movement, which will not be described in detail here.

As shown in Figure 1, a throttle sand control device suitable for gas field downhole includes a throttle 1 and a sand control device 2, characterized in that the upper end of the throttle 1 includes a delivery head 3, a fishing head 4 and a drainage sleeve 5, the lower end of the throttle 1 includes a slip 6 and a rubber cylinder 7, the sand control device 2 includes an upper sand control seat 8, a lower sand control seat 9 and a sand control net 10, the tail of the throttle 1 is connected to the upper sand control seat 8, the sand control net 10 is arranged between the upper sand control seat 8 and the lower sand control seat 9, and the upper sand control seat 8 and the lower sand control seat 9 are connected by threads for fixing the sand control net 10.

Furthermore, the sand prevention device 2 is fixed to the tail of the throttle 1 by threaded connection.

Furthermore, the sand-proof net 10 is in capsule style, the bottom of the sand-proof net 10 is designed to be U-shaped, and the inner wall of the sand-proof net 10 is provided with irregular grooves 11 to change the movement trajectory of the sand particles and reduce the movement speed of the sand particles. At the same time, the grooves can embed some sand particles. The groove material is different from the main material of the sand-proof net and will not reduce the overall structural strength.

Furthermore, the lower end of the sand-proof net 10 is set to 50 meshes, and the upper end of the sand-proof net 10 is set to 90 meshes. The secondary filtration improves the filtering effect and reduces the risk of clogging.

As an optimization, the sand control net 10 can be disassembled and replaced, which prolongs the life of the throttle and is easy to install and disassemble.

Working principle:

When the gas and liquid at the bottom of the well carry sand particles and flow out from bottom to top and flow through the downhole throttle, the sand control device plays a key role. First, the sand control net is designed as a capsule type. The gas and liquid pass through the first layer of the sand control net of the sand control device. The lower sand control net adopts a convex structure design with a mesh size of 50. According to the principle of force on sand particles, larger sand particles cannot pass through the sand control net, and are pushed to the sides of the throttle by the convex part, while the fluid and smaller sand particles can flow into the sand control net through the pores of the sand control net. Irregular grooves are set on the inner wall of the sand control net to change the movement direction of the sand particles and embed some of the sand particles. The gas and liquid enter the second layer of the sand control net of the sand control device, which is designed as a 90-mesh concave structure to perform secondary filtration on the sand particles with smaller diameters. The filtered gas and liquid then flow into the throttle and finally reach the wellhead. Throughout the process, the design of the sand control device greatly improves the filtration efficiency and reduces the risk of blockage. Through the ingenious convex and concave surface design and multi-level filtering structure, the sand control device successfully achieves effective filtration of sand particles of different sizes, thereby ensuring the stable operation of the downhole choke. This innovative working principle greatly improves the sand control effect and provides a reliable guarantee for the continuous production of oil and gas wells.

Claims (5)

1. The utility model provides a be applicable to gas field downhole choke sand control device, includes choke ware (1) and sand control device (2), its characterized in that, choke ware (1) upper end is including throwing first (3), fishing head (4) and drainage sliding sleeve (5), choke ware (1) lower extreme includes slips (6) and packing element (7), sand control device (2) are including last sand control seat (8), lower sand control seat (9) and sand control net (10), choke ware (1) afterbody is connected with last sand control seat (8), sand control net (10) set up between last sand control seat (8) and lower sand control seat (9), go up sand control seat (8) and be connected through the screw thread down between sand control seat (9) and be used for fixed sand control net (10).

2. A sand control device for a downhole choke for gas fields according to claim 1, wherein the sand control device (2) is fixed at the tail of the choke (1) by means of a threaded connection.

3. The sand control device for the downhole choke applicable to the gas field according to claim 1, wherein the sand control net (10) is in a capsule type, the bottom of the sand control net (10) is designed to be U-shaped, and irregular ravines (11) are arranged on the inner wall of the sand control net (10).

4. The sand control device for a downhole choke suitable for a gas field according to claim 1, wherein the lower end of the sand control net (10) is set to 50 meshes, and the upper end of the sand control net (10) is set to 90 meshes.

5. A sand control device for a downhole choke for gas fields according to claim 1, wherein the sand control net (10) is removable and replaceable.