CN206458410U - Spring sliding sleeve sand blaster - Google Patents

Abstract

The utility model relates to a spring sliding sleeve formula sand blaster. The problem of current multistage sand blaster cause the interior hydrojet of fracturing string time because bottom hole pressure is big after leading to pressing easily has mainly been solved. The method is characterized in that: the upper joint (1) is connected with an outer central pipe (3), the outer central pipe is sequentially connected with a rubber cylinder (11) and a lower rubber cylinder seat (12) through an upper rubber cylinder seat (10), and the lower joint (14) is arranged in the lower rubber cylinder seat (12); the lower end surface of the inner central tube (6) is contacted with the upper end surface of the upper rubber cylinder seat (10); the upper joint is connected with a fixed ring (2); the lower end face of the fixing ring is abutted against the upper end face of the filter screen (4), and the filter screen is connected with the sliding sleeve (5); the upper end of the inner central tube (6) is connected with the filter screen, and the lower end is connected with the upper end of the lower central tube (9); the upper end face of the lower central tube is provided with a stop block, and a spring is arranged between the stop block and the sliding sleeve. The spring sliding sleeve type sand blaster can realize multi-layer fracturing of an immovable pipe column and prevent the phenomenon of liquid spraying in an oil pipe when the fracturing pipe column is started.

Description

Spring sliding sleeve sand blaster

technical field

The utility model relates to the technical field of oil field downhole operation engineering, in particular to a spring sliding sleeve type sand blaster.

Background technique

Hydraulic fracturing is still an effective means of reservoir stimulation, especially multi-layer fracturing without moving strings can not only improve the actual effect, but also increase the single well production. In the past, multi-stage fracturing strings used multi-stage sand blasters to achieve multi-layer fixed string fracturing by throwing balls and setting sleeves. The principle is to knock off the sliding sleeve of the sand blaster at the current level and drop it into the next level of sand blaster to block its sand outlet. However, if the sliding sleeve is not completely put in place in this method, the sand outlet of the next-stage blaster cannot be blocked; in addition, the sand outlet of the uppermost blaster cannot be closed after being pressed. This will lead to high bottom hole pressure after fracturing, and dirty oil and sewage will be sprayed out in the tubing during the tripping of the tubing string, making it easy for wellhead workers to slip and fall, and pollute the working environment. In addition, the sliding sleeve slides in the tubing for a long distance, and its supporting tools require a large internal diameter to achieve layered fracturing.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the problem that the existing multi-stage sand blaster in the background technology is easy to cause liquid spraying in the oil pipe when the fracturing string is started due to the large bottom pressure after fracturing, and to provide a spring The sliding sleeve type sand blaster, the spring sliding sleeve type sand blaster, can realize multi-layer fracturing without moving the string, and prevent the phenomenon of liquid spraying in the tubing when the fracturing string is lifted.

The utility model can solve the problem through the following technical solutions: the spring sliding sleeve type sand blaster includes an upper joint, an inner central pipe, and a lower joint, the upper joint is connected to the outer central pipe, and the outer central pipe passes through the upper The rubber cartridge seat is connected to the rubber cartridge and the lower rubber cartridge seat in turn, and the lower joint is placed in the lower rubber cartridge seat; the lower end surface of the inner central tube is in contact with the upper end surface of the upper rubber cartridge seat; the inner wall of the upper joint is connected to the fixed ring; the lower end surface of the fixed ring Resist on the end surface of the filter net, the filter screen is connected to the sliding sleeve through shear nails, the upper end of the inner central tube is connected to the filter screen with a screw; the lower end of the inner central tube is connected to the upper end of the lower central tube with a threaded buckle, and the lower end of the lower central tube is threaded to the lower joint; A stopper is arranged on the end face, and a spring is arranged between the stopper and the sliding sleeve.

Compared with the above-mentioned background technology, the utility model has the following beneficial effects: the spring sliding sleeve type sand blaster is used for multi-layer fracturing of the fixed pipe string, and after the fracturing of one layer is completed, the sliding sleeve can automatically close the sand outlet After the fracturing of each layer is completed, the sand outlets are all blocked, so that when the fracturing string is started, no liquid is sprayed in the tubing. It solves the pollution problem of oil and water well operation well site, further improves the working environment of operators, reduces the unsafe factors of operators' operation, implements the control of production process, minimizes the discharge of pollutants, and reduces the pressure of terminal treatment. Promote the "zero discharge" of pollutants, and cooperate with the ground liquid collection device to realize green and environmentally friendly construction.

Description of drawings:

Accompanying drawing 1 is the structural representation of the utility model.

In the figure: 1-upper joint, 2-fixing ring, 3-outer central tube, 4-filter, 5-sliding sleeve, 6-inner central tube, 7-spring, 8-block, 9-lower central tube, 10-upper rubber cartridge seat, 11-rubber cartridge, 12-lower rubber cartridge seat, 13-O type sealing ring, 14-lower connector, 15-shear nails.

detailed description:

The utility model will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, this spring sliding sleeve type sand blaster comprises upper joint 1, inner central pipe 6, lower joint 14, and described upper joint 1 connects outer central pipe 3; 10 connect the rubber cartridge 11 and the lower rubber cartridge seat 12 in turn, the lower joint 14 is placed in the lower rubber cartridge seat 12, and an O-ring 13 is placed between the lower rubber cartridge seat 12 and the lower joint 14; the inner central tube 6 The lower end surface is in contact with the upper end surface of the upper rubber cylinder seat 10; the inner wall of the upper joint 1 is connected to the fixed ring 2, and the lower end surface of the inner central tube 6 has a gap; the lower end surface of the fixed ring 2 is against the upper end surface of the filter screen 4, and the filter screen 4 is The nail 15 is connected with the sliding sleeve 5, and the filter screen 4 has a slit with a width of 0.25 mm. The upper end of the inner central tube 6 is connected to the filter screen 4 with a screw; The lower joint 14 is threadedly connected; the upper end surface of the lower central tube 9 is provided with a stopper 8, and a spring 7 is arranged between the stopper 8 and the sliding sleeve 5, and one end of the spring 7 is squeezed onto the end surface of the sliding sleeve 5, and the other end is against the end surface of the sliding sleeve 5. The upper end of the stopper 8; there is a gap of 2mm between the inner diameter of the upper rubber cylinder seat 10 and the outer diameter of the lower central tube 9, which can ensure the smooth flow of the liquid guide channel.

The outer wall of the central tube 6 in the sand blaster is processed into a plane with a width of 5 mm and a depth of 1.5 mm, forming a pouring cavity with the inner wall of the outer central tube 3 . One end of the spring 7 is squeezed onto the end face of the sliding sleeve 5, and the other end is fixed to the lower end of the inner central tube 6 by a stopper 8. The filter screen 4 and the inner central tube 6 are connected by a screw thread, and the compression spring 7 reaches the initial position. The sliding sleeve 5 is fixed on the filter screen 4 by shear nails, and the filter screen 4 has a seam with a cutting width of 0.25mm. The upper joint 1 is connected with the outer central pipe 3, and the lower end of the inner central pipe 6 is connected with the lower central pipe 9 with a threaded buckle, which not only ensures the strength but also achieves a sealing effect. The lower end surface of the inner central pipe 6 is in contact with the upper end surface of the upper rubber cylinder seat 10, the upper end of the inner central pipe 6 is connected with the filter screen 4 through a screw thread, and the upper end surface of the filter screen 4 is fixed inside the upper joint 1 through the fixing ring 2, wherein the filter The net 4, the inner center tube 6, the lower center tube 9, the lower joint 14, the sliding sleeve 5, the shear pin 15, the spring 7, and the stopper 8 are an internal switch assembly, which is loaded into the outer center tube 3 during installation , the upper rubber tube seat 10, the rubber tube 11, and the lower rubber tube seat 12, and by adjusting the position of the fixed ring 2 inside the upper street 1, the lower end of the fixed ring 2 can withstand the switch assembly to prevent its Move up and down. There is a gap on the lower end surface of the inner central tube 6 to ensure liquid flow. Wherein, the inner central pipe 6 and the outer central pipe 3 each have two symmetrically distributed sand outlets, the sand outlet of the inner central pipe 6 is smaller, the sand outlet of the outer central pipe 3 is larger, and the sand outlets of the inner and outer central pipes are larger. The mouth needs to be aligned and then welded to ensure the closure of the fluid guide channel. After assembly, the sliding sleeve 5 blocks the sand outlet inside the inner center pipe 6 .

When in use, the fracturing string should be assembled according to the number of fracturing layers, then put into the well and lowered into place. When fracturing, first throw the ball, the steel ball falls to the sliding sleeve 5, pressurizes the inside of the tubing and cuts the shear nails, the sliding sleeve 5 descends, and at the same time compresses the spring 7 to expose the sand outlet, at this time, the liquid in the tubing passes through the sand outlet Throttling occurs, the packer is set, and the fracturing operation can be carried out. After the fracturing of this layer is completed, under the effect of the elastic force of the spring 7, the sliding sleeve 5 resets, which can block the sand outlet and prevent the liquid from being ejected from the tubing when the fracturing string is started.

Claims (5)

1. a kind of spring sleeve type sanding machine, including top connection（1）, inner central tube（6）, lower contact（14）, it is characterised in that：Institute State top connection（1）Connect exterior central tube（3）, the exterior central tube（3）Pass through upper glue tube base（10）It is sequentially connected packing element（11）, under Glue tube base（12）, the lower contact（14）It is placed in lower rubber cylinder seat（12）It is interior；Inner central tube（6）Lower surface and upper glue tube base（10）On End contact；Top connection（1）Inwall is connected ring（2）；Retainer ring（2）Lower surface is butted on filter screen（4）Upper surface, filter screen（4） Sliding sleeve is connected by shear pin（5）, inner central tube（6）Upper end screwed connection filter screen（4）；Inner central tube（6）Lower end screw buckle connection Lower center tube（9）Upper end, lower center tube（9）Lower end is threadedly coupled lower contact（14）；Lower center tube（9）Upper surface is equipped with block （8）, the block（8）With sliding sleeve（5）Between be equipped with spring（7）.

2. spring sleeve type sanding machine according to claim 1, it is characterised in that：The lower rubber cylinder seat（12）, lower contact （14）Between be equipped with O-ring seal（13）.

3. spring sleeve type sanding machine according to claim 1, it is characterised in that：The filter screen（4）Cutting width is 0.25mm seam.

4. spring sleeve type sanding machine according to claim 1, it is characterised in that：The upper glue tube base（10）Internal diameter is with Central tube（9）External diameter has 2mm gap.

5. spring sleeve type sanding machine according to claim 1, it is characterised in that：The inner central tube（6）Open lower surface There is gap.