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A temporary plugging agent and fracturing fluid technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., to achieve the effects of simple delivery operation, wide temperature range, and high plugging rate
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A temporary plugging agent and fracturing fluid technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., to achieve the effects of simple delivery operation, wide temperature range, and high plugging rate
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[0046] The invention provides a temporary plugging diversion fracturing method. By pumping a high-strength water-soluble (oil-soluble) temporary plugging agent into the formation, the previous fractures are blocked, the fluid is forced to divert, and new fractures are opened to complicate the fracture morphology, thereby increasing single well production and controlling reserves. During the construction process, large particle temporary plugging agent is added to the formation in a timely manner, and the fluid follows the principle of flowing in the direction of least resistance. The temporary plugging agent seals the original fracture and produces a high-strength filter cake near the wellbore. Subsequent working fluid cannot continue to flow into the original fracture, forcing the fracturing fluid to open a new fracture at a relatively weak point in the original fracture. In the stress contour area, the new cracks continue to extend along the crack initiation direction, and r...
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Abstract
The invention provides a temporary plugging turnaround fracture method. The temporary plugging turnaround fracture method comprises the following steps that firstly, working liquid comprising fracturing liquid is input into a well; secondly, when the liquid level of the working liquid rises rapidly, a short fiber mesh is added into the working liquid; thirdly, temporary plugging agents comprising the large-particle temporary plugging agent and the powder temporary plugging agent are added into the working liquid; fourthly, the PH value of the lower-layer working liquid is measured, if the PH value of the lower-layer working liquid is neutral or acidic, a sodium hydroxide solution is added, and the PH value is adjusted to be weakly alkaline; and fifthly, after the pressure is stable, an acid solution is added till the PH value of the lower-layer working liquid is neutral. The temporary plugging turnaround fracture method has the advantages that by injecting the high-strength temporary plugging agents comprising the large-particle temporary plugging agent and the powder temporary plugging agent into a stratum in a pumping mode, former cracks are plugged, a fluid is forced to turn around, new cracks are opened in a pressed mode to enable crack forms to be complicated, and accordingly the single well yield and the controlled reserve are increased.
Description
technical field [0001] The invention relates to the technical field of staged fracturing of horizontal wells, in particular to a temporary plugging and diverting fracturing method. Background technique [0002] For low-permeability oil fields, staged fracturing of horizontal wells forms multiple independent artificial fractures in the horizontal well section to improve seepage conditions and single-well productivity. It is desired to form the above-mentioned optimized multiple hydraulic fractures safely in a relatively long horizontal well section in a relatively short period of time, and to quickly drain fluid after fracturing, so as to realize staged fracturing of horizontal wells with low damage. The technical difficulty of fracturing technology lies in the selection of staged fracturing technology and downhole plugging tools. There are two aspects to the lack of staged stimulation of conventional horizontal wells: First, according to the understanding that more than 80%...
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