Combined type sand supply system and method for oilfield fracturing operation

Abstract

The invention relates to a combined type sand supply system for oilfield fracturing operation. The combined type sand supply system comprises a sand hopper, wherein the sand hopper is mounted above the input end of a first belt conveyor; the other end of the first belt conveyor is connected with a bucket elevator through a horizontal butt-joint material opening; the lower end of the bucket elevator is mounted on a foundation through a fixed hinge support; the upper end of the bucket elevator is mounted on a fixed frame; the fixed frame is positioned at the upper end of a sand bin; a second belt conveyor is arranged below the output end of the bucket elevator; and the two ends of the second belt conveyor are opposite to a feeding opening of the sand bin. The combined type sand supply systemfor oilfield fracturing operation provided by the invention is used under the working condition of a large-scale sand bin, is reasonable in size design of equipment, meets the function and is convenient to transport.

Description

technical field [0001] The invention relates to sand supply equipment, in particular to a combined sand supply system and method for oilfield fracturing operations. Background technique [0002] After the production of oil wells reaches a certain stage, the production capacity and permeability decrease. In order to enhance the oil drainage capacity and increase the production of oil wells, people invented fracturing technology. There are two types of fracturing methods: hydraulic fracturing and high-energy gas fracturing. Hydraulic fracturing is to inject fluid into the well at high speed by the ground high-pressure pump truck unit, and use the high pressure at the bottom of the well to break the rock in the oil layer and produce cracks. In order to prevent the pressure from dropping after the pump truck stops working, the cracks will close up by themselves. The injected liquid after the formation rupture is mixed with sand which is several times denser than the formation de...

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Problems solved by technology

[0004] 1. The height limit of the foldable sidewall belt conveyor is serious. When the height of the fracturing sand bin exceeds 6 meters, the size of the sidewall belt conveyor will still exceed the limit even if it is folded, which cannot meet the road transportation requirements of land vehicles;

[0005] 2. The vertical lifting capacity of the sidewall belt conveyor is limited. When the hourly transport capacity is required to be large, it is necessary to tilt the arrangement or increase the size of the model. The inclined arrangement requires a larger space, which is not conducive to site layout, and the size of the model increases. transportation difficulties;

But it is easy to block the material and get stuck, and it is very unfavorable to transport sand with a small amount of water, the safety factor of sand supply is low, and it is easy to cause the operation to stop;

[0007] 4. The bucket elevator occupies a small space, conveys vertically, and does not have strict requirements on materials. However, due to the equipment properties, the feeding height of the equipment itself is high. At the same time, the foundation cannot be embedded in the well head, and only a fixed base can be made. It will be higher. After equipped with a bag-breaking sand bucket, the feeding height can reach more than 3 meters. The general convenient and quick auxiliary feeding equipment cannot meet the feeding height.

In this way, it is necessary to excavate a pit at the place where the bucket elevator is arranged to reduce the feed. If the height of the bin remains unchanged, this will increase the overall height of the bucket elevator equipment, and the pit will be re-excavated every time a wellhead is replaced. , wasting a lot of human and financial resources

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