Intelligent staged hydraulic fracturing device for coal bed and method thereof

Abstract

According to an intelligent staged hydraulic fracturing device for a coal bed and a method thereof, the intelligent staged hydraulic fracturing device comprises a fracturing fluid source, a processing unit, a sleeve and a base tube arranged in the sleeve in a sleeved mode, and a gap is preserved between the sleeve and the base tube; two packers and controllable packing parts are arranged in the gap; and the two packers are arranged at two ends of the gap correspondingly; the controllable packing part comprises a fracturing control valve and two controllable splitters, an external outlet and an internal outlet are formed between the two controllable splitters, and the fracturing control valve is arranged at the internal outlet. The method includes the following steps of (1) placing the sleeve in the coal bed; (2) determining the external outlet on the sleeve corresponding to a position need to be fractured in the coal bed; (3) opening the fracturing control valve to make the outer surfaces of the controllable splitters be attached to the inner surface of the sleeve; (4) starting the fracturing fluid source to make the fracturing fluid flow into the base tube; (5) the fracturing fluid flowing out from the sleeve; (6) applying the fracturing fluid on the coal bed to achieve fracturing; and (7) repeating the steps till each section of the coal bed meets fracturing standards.

Description

technical field [0001] The invention belongs to the technical field of coal seam fracturing, and in particular relates to a coal seam intelligent graded fracturing device and method. Background technique [0002] Hydraulic fracturing is an essential step in the mining process of coalbed methane, and hydraulic fracturing is an important technical measure for increasing oil and gas production and water well injection. The high-viscosity liquid is injected into the well with a displacement that greatly exceeds the absorption capacity of the coal seam by using the high-pressure pump set on the surface, and then high pressure is generated near the bottom of the well. When the pressure exceeds the ground stress near the borehole wall and the tensile strength of the rock, cracks are formed in the coal seam. Continuing to inject fracturing fluid with proppant into the fracture, the fracture is extended forward, filling the fracture with proppant. In this way, sand-filled cracks of...

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Problems solved by technology

[0003] At present, the commonly used method for fracturing operations is one-shot fracturing step by step, and after fracturing, all layers are merged and exploited. However, when the fracturing effect of a certain layer is not good, the fracturing operation cannot be carried out again, which will affect the fracturing effect. At the same time, the interlayers interact with each other during the joint production, and single-layer sections cannot be operated independently. When there is a problem in a single-layer section, it will affect the overall production of the well, and even cause the well to be scrapped, making it impossible to increase production for a long time

In addition to the one-time ball-dropping step-by-step fracturing, a small number of multi-stage fracturing methods have appeared, but they often have the disadvantages of low positioning accuracy of intervals, complicated operation technology, and low reliability, and it is difficult to meet the requirements of multi-stage fracturing for intelligent well completion. Fracturing needs

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