Abstract: A three-dimensional detection method for red tide algae based on holographic imaging is provided, including: constructing a coaxial optical path based on a structure of a Mach-Zehnder interferometer; determining reconstruction distances of the system under different object distances; constructing an original hologram database of the algae; selecting an original hologram, and two reconstructed holograms with different reconstruction distances as a three-dimensional spatial sample of the original hologram; labeling algae in sample, and recording species and bounding boxes of the algae; training a target detection network with the sample of the holograms and a label file; detecting, with the trained target detection neural network, the sample of the algae to obtain species and a quantity of plankton in imaged water. The disclosure further provides a three-dimensional detection device for red tide algae. The method can improve a detection speed and detection accuracy of the red tide algae.

Abstract: The present disclosure relates to a differential pressure driven burst-pipeline emergency blocking system. The system includes a valve body with flanges on opposite axial ends, a cylindrical valve sleeve connected with the inner wall of a flange end and having a through hole in the valve sleeve wall. The wall of the valve sleeve is in movable fit with a valve spool having a U-shaped section. The working fluid through hole in the valve sleeve is communicated with the inner chamber of the valve body and can be closed by a cylindrical surface of the valve spool. A horizontal push rod is in movable fit with a central hole at the left end of the valve spool, and opposite ends of the horizontal push rod are in movable fit with axial orifices of left and right support seats in the valve body respectively.

Abstract: The invention includes providing a propped hydraulic fractures in a subterranean formation including the steps of: injecting a fracturing fluid into the subterranean formation at a pressure sufficient to initiate and propagate at least one hydraulic fracture wherein the fracturing fluid comprises a proppant; when the at least one hydraulic fracture has reached a target size, adding to the fracturing fluid a predetermined amount of a diverter material wherein the diverter material comprises material having a specified size distribution, and comprising a material that degrades at conditions of the subterranean formation, the diverter material effective to essentially block flow of fracturing fluid into the at least one fracture; and continuing to inject fracturing fluid at a pressure effective to initiate at least one additional fracture within the subterranean formation.

Abstract: The present inventions include an insulating fluid comprising a non-particulate viscosifying polymer, a water or brine, a cross-linking agent, and insulating particulates. The insulating fluid may be produced by performing the following steps in any order: adding a non-particulate viscosifying polymer to a brine, adding a cross-linking agent, adding insulating particulates, and optionally adding a solvent. The insulating fluid may be injected into an annulus surrounding a pipe such as production tubing, casing, surface pipelines, subsea pipelines, or risers.

Abstract: A non-aqueous suspension including boron-containing particulates, a low molecular weight polyalkylene glycol and a suspension stabilizer is provided. Methods of crosslinking water soluble polymers and of fracturing a subterranean formation are also provided.

Abstract: Non-toxic high temperature stabilizers are described for compositions for treating subterranean formations using fluids that are hydrated from dry mix blends using controlled release methods of particle dissolution. In particular, one aspect of this invention is a dry blended particulate composition for hydraulic fracturing containing a particulate hydratable polysaccharide, a particulate crosslinking agent, a slowly releasing particulate base, and a non-toxic stabilizing salt for high temperature use. The dry blended particulate composition is capable of significantly improving rheological properties. It is useful for making hydraulic fracturing and other oilfield treatment fluids.

Abstract: A non-aqueous suspension including boron-containing particulates, a low molecular weight polyalkylene glycol and a suspension stabilizer is provided. Methods of crosslinking water soluble polymers and of fracturing a subterranean formation are also provided.

Abstract: Methods and apparatus are disclosed for fracturing subterranean formations using fracturing fluids that are hydrated from dry mix blends. One aspect of the invention comprises a dry blended particulate composition for hydraulic fracturing comprising a particulate hydratable polysaccharide, a particulate crosslinking agent, and a slowly releasing particulate base. The compositions employ controlled release methods of particle dissolution. The invention reveals a dry blended particulate composition capable of significantly improved high temperature stability. Further, methods of fracturing and apparatus for rapidly hydrating and pumping the fracturing fluid into subterranean formations are disclosed.

Abstract: Improved fluid loss control in gravel pack placement fluids is achieved when a fluid loss control additive is provided comprising a selectively soluble particulate having a size of less than 1000 microns and having a linear size distribution when cumulative weight percent is plotted against the logarithm of the particle size. The preferred selectively soluble particulate comprises calcium carbonate.