CN205089297U - Multilayer becomes hole sand screen - Google Patents

Abstract

<b>A multi-layer variable-pore sand filter pipe, including: upper joint (</b><b>1</b><b>), baffle (</b><b>2</b><b>), center pipe (</b><b>3</b><b>), filter sand body (</b><b>4</b><b>), protective net (</b><b>5</b><b>). The upper end of the central pipe (</b><b>3</b><b>) of the multi-layer variable-pore sand filter pipe is threadedly connected to the upper joint (</b><b>1</b><b>), the lower end is provided with external threads, and the main body of the central tube (</b><b>3</b><b>) is provided with flow holes (</b><b>0</b><b>), there is a filter sand body (</b><b>4</b><b>) outside the flow hole (</b><b>0</b><b>)</b ><b>,</b><b>The filter sand body (</b><b>4</b><b>) has a protective net (</b><b>5</b><b>), around the top of the filter sand body (</b><b>4</b><b>), on top of the protective net (</b><b>5</b><b>) With baffles (</b><b>2</b><b>). The utility model is suitable for sand control of oil and gas wells in oil fields, reduces the risk of local puncture, has high sand control reliability, large filtration area, small flow resistance, stable filter holes, strong deformation resistance, and meets the requirements of horizontal wells and highly inclined wells. Scour-resistant, suitable for well washing under various conditions, flexible length, can be selected according to different well conditions, long service life, extended sand control period, saving operating costs, convenient construction and low operating costs. </b>

Description

Multilayer Variable Pore Sand Filter Tube

technical field

The utility model relates to downhole sand control tools for oil and gas wells in oil fields, in particular to a multi-layer variable-porosity sand filter pipe.

Background technique

At present, sand production in oil and gas wells in oil fields is one of the important problems encountered in the process of oil exploitation. If the sand production cannot be effectively controlled, the sand production of oil and gas wells will become more and more serious, resulting in the failure of effective development of oil and gas wells. The traditional sand control methods mainly include the following: one is mechanical sand control; the other is chemical sand control; the third is compound sand control. More than 90% of sand production wells in Shengli Oilfield use mechanical sand control, which is divided into two categories: one is to pre-fill sand control strings to retain sand, and the other is to lower sand control strings and then fill them. The above-mentioned sand control has the following problems: first, poor shock resistance and drop resistance; second, low extrusion strength; third, effective drainage area is small and flow resistance is large, which cannot meet the production needs of oil and gas wells in oil fields.

Contents of the invention

The purpose of this utility model is exactly to design a kind of multi-layer variable-pore sand filter tube aiming at the above-mentioned defects existing in the prior art.

The utility model is realized by following technical scheme:

The utility model comprises: an upper joint, a baffle plate, a center pipe, a filter sand body and a protective net. The upper end of the central pipe of the multi-layer variable-pore sand filter pipe is threadedly connected to the upper joint, the lower end is provided with an external thread, the main body of the central pipe is provided with a flow hole, and a filter sand body is provided outside the flow hole, and the filter sand body is provided There is a protective net, and a baffle is arranged around the top of the filter sand body and on the top of the protective net.

The cross-section of the baffle plate in the above-mentioned multi-layer variable-porosity sand filter pipe is a trapezoidal annular structure.

The filter sand body in the above-mentioned multi-layer variable pore sand filter pipe is a mixed cylinder with certain pores formed by cementing resin and sand.

The protective net in the above-mentioned multi-layer variable-porosity sand filter pipe has 1 to 5 layers.

The beneficial effect of the utility model is that it is suitable for sand control of oil and gas wells in oil fields and has the following characteristics:

1. The multi-layer variable-porosity sand filter pipe with higher porosity is more suitable for the construction of high-efficiency underground passages for oil and gas wells;

2. Reduce the risk of local puncture. Under the same conditions, the higher porosity makes the speed of underground fluid infiltration much slower than that of other sand control devices, so as to avoid the risk of local piercing of sand particles under high water pressure;

3. Resin sand control filter layer, high sand control reliability;

4. Large filtration area, small flow resistance, high output of crude oil.

Stable filter holes, strong anti-deformation ability, meet the requirements of horizontal wells and highly deviated wells;

6. The surface is resistant to erosion and can be adapted to well washing in various situations;

7. The length is flexible and can be selected according to different well conditions;

8. Long service life, prolong the sand control cycle and save operating costs;

9. The sand control layer is not easy to be blocked by smaller sand and gravel, and maintains high permeability for a long time;

10. The construction operation is easy to operate and the operation cost is low.

Description of drawings

Fig. 1 - the schematic diagram of the half-section structure of the main view of the utility model.

In the figure, 0. flow hole, 1. upper joint, 2. baffle plate, 3. center pipe, 4. sand filter body, 5. protective net.

detailed description

Below in conjunction with accompanying drawing, the implementation of the utility model is further elaborated:

The multi-layer variable-pore sand filter pipe is composed of an upper joint 1, a baffle plate 2, a central pipe 3, a filter sand body 4, and a protective net 5. The upper end of the central pipe 3 of the multi-layer variable-pore sand filter pipe is threadedly connected to the upper joint 1, and the lower end is provided with an external thread. The sand body 4 and the filter sand body 4 are provided with 4 layers of protective nets 5 , and an annular baffle plate 2 with a trapezoidal cross section is arranged around the top of the sand filter body 4 and on the top of the protective net 5 .

operation method

1. When oil and gas wells are operated, the sand should be washed to a certain depth according to the design requirements, and the sand pocket should not be less than 20m;

2. Check the condition of the casing with the well gauge of the corresponding specification to meet the smooth running of the multi-layer variable-porosity sand filter pipe into the well;

3. Pipe string matching from bottom to top: plug (or temperature control valve) + sand settling tubing + centralizer + multi-layer variable pore sand filter tube + centralizer + tubing + packer + tubing to the wellhead;

Lower the multi-layer variable pore sand filter pipe to the upper and lower boundaries of the oil layer, with an error of + 1m, according to the requirements of the packer for seat sealing, anchoring, and throwing away. slip drill.

Claims (4)

1. A multi-layer variable pore sand filter pipe, comprising: upper joint (1), baffle plate (2), center pipe (3), filter sand body (4), protective net (5); it is characterized in that: The upper end of the central pipe (3) of the multi-layer variable pore sand filter pipe is threadedly connected to the upper joint (1), the lower end is provided with an external thread, and the main body of the central pipe (3) is provided with a flow hole (0), and the flow hole (0) is provided with a filter sand body (4) outside, and a protective net (5) is provided outside the filter sand body (4), and a baffle plate ( 2). 2. The multi-layer variable pore sand filter pipe according to claim 1, characterized in that: said baffle plate (2) has a trapezoidal ring structure in cross section. 3. The multi-layer variable-porosity sand filter pipe according to claim 1, characterized in that: the filter sand body (4) is a mixing cylinder with certain pores formed by cementing resin and sand. 4. The multi-layer variable-porosity sand filter pipe according to claim 1, characterized in that: the protective net (5) has 1-5 layers.