35results about How to "Strong drainage ability" patented technology

The invention discloses a double-layer high-strength fracturing propping agent and a preparing method thereof and belongs to the technical field of oil (gas) extraction auxiliaries. The fracturing propping agent comprises a ceramic inner core and a silicon nitride ceramic shell wrapped on the surface of the ceramic inner core. The proportion of the diameter of the ceramic inner core and the thickness of the silicon nitride ceramic shell is 5-10:1. The ceramic inner core is mainly prepared from, by mass, 40%-50% of bauxite, 40%-50% of shale and 0-10% of gangue. The silicon nitride ceramic shell is mainly prepared from, by mass, 60%-70% of silicon nitride and 30%-40% of bauxite. The double-layer high-strength fracturing propping agent has the advantage of high tensile strength, the low breaking rate, low apparent density, the high corrosion resistance capability and the like, the breaking rate is smaller than 6% under the condition of 103 Mpa, the acid solubility is smaller than 2%, and the double-layer high-strength fracturing propping agent is particularly suitable for development of deep well and ultra-deep well oil and gas fields.

The invention belongs to the technical field of petroleum fracturing propping agents and preparation methods thereof, and particularly relates to an ultralow-density petroleum fracturing propping agent and a preparation method thereof. The technical problems that an existing petroleum fracturing propping agent is low in strength, poor in anti-corrosion capacity and weak in flow guiding capacity are mainly solved. The ultralow-density petroleum fracturing propping agent is prepared by taking multiple raw materials such as bauxite waste tailings, leftover materials and manganese powder as raw materials through multiple processes such as breaking, grinding, granulating and high-temperature sintering and has the advantages of resisting high temperature and high pressure, being high in strength and flow guiding capacity, resisting corrosion and the like.

The invention provides an entrance guiding cone used for a vertical oil-gas mixing transmission pump, the guiding cone is arranged at the center of the cavity of the vertical oil-gas mixing transmission pump uniform blender and positioned at the entrance of the mixing transmission pump; the guiding cone is at least constructed by a guiding cone body, a round diversion pad and a guiding cone base tightly connected with each other in sequence from top to bottom; the lateral periphery of the guiding cone is distributed with diversion vanes used for diverging the direction of the multi-phase fluid; the lateral periphery of the guiding cone base and the diversion pad are consecutive streamline surface; and the lower part of the guiding cone base is connected with the shell of the mixing transmission pump uniform blender. The guiding cone uses the diversion vanes to commutate oil-gas multi-phase fluid to be fit for entering the mixing transmission pump pressurizing unit to guarantee the normal work of the pressurizing unit, thus ensuring that the oil-gas mixing transmission pump operates stably and safely, and the work performance of the vertical oil-gas mixing transmission pump can be optimal.

The invention relates to a blockage-removing method for polymer flooding blocking wells, and belongs to the field of fracturing reformation of oil wells. The blockage-removing method includes the steps of conducting fracturing construction to an blocked oil layer caused by polymer injection and controlling the length of an artificial fracture to 40-60 m, and the height to no more than 20 m, specifically, the fracturing construction is small-scale fracturing construction by sequentially injecting stratum treating fluid with a volume of 10-35 m3, injecting ahead fluid with a volume of 10-30m3, injecting particle loaded fluid with a volume of 40-60 m3, and injecting displacing fluid with a volume of 8-16m3. By reasonable selection of the polymer flooding to block wells, the pertinency and effectiveness of subsequent fracturing measure reformation are improved; by control of the length and the height of the artificial fracture, not only the permeability of a polymer blocked oil layer in near bore zones and effectiveness of the measures are improved, but also wastes of materials and labor cost caused by an excessive large construction scale are avoided, the validity of fracturing blockage-removing measures is increasingly prolonged, and the reservoir recovery is improved.

A gas lubrication cluster spiral groove end face mechanical sealing structure comprises a moving ring and a stationary ring of a mechanical seal. One side of the end face of the moving ring and one side of the end face of the stationary ring are high-pressure sides, namely, upper streams, and the other side of the end face of the moving ring and the other side of the end face of the stationary ring are low-pressure sides, namely, lower streams. A plurality of cluster spiral grooves symmetrically distributed along the circumference of the end face are formed in the end face of at least on sealing ring of the moving ring or the stationary ring, the cluster spiral grooves are formed by combining a plurality of micro spiral grooves with different spiral angles in the circumferential direction of the end face, the micro spiral grooves in the same cluster spiral groove are separated by a sealing weir free of grooves on the high-pressure side, the groove roots of the micro spiral grooves in the same cluster spiral groove are overlaid and communicated to a whole on the lower-pressure side, and sealing dams are arranged on the down streams of the cluster spiral grooves. Through the convergence configuration of bionic high-speed flyer wings and the alula structure of flyer wing front edges, the gas lubrication cluster spiral groove end face mechanical sealing structure has a high flow guide effect and compression function on fluid media, the low-speed start and stop characteristic, high-speed running stability and sealing performance of the seal can be improved, the high-speed disturbance rejection capacity of the seal is improved, and end face abrasion is avoided.

The invention relates to a novel foam metal sand-prevention pipe. The sand-prevention pipe is used for underground sand prevention for an oil and gas field and structurally comprises an outer pipe protective casing, a foam metal sand-prevention layer, wire-winding support strips and a base pipe in sequence from outside to inside, the foam metal sand-prevention layer is provided with flow guide gaps which are distributed in a staggered mode, each flow guide gap is in a trapezoidal shape with the outside narrow and the inside wide, the wire-winding support strips are welded to the outside of the base pipe, the base pipe contains parallel flow guide through holes, each flow guide through hole is located between the corresponding two wire-winding support strips, the minimum filtration diameter of the foam metal sand-prevention layer reaches 0.05 mm, the thickness of the foam metal sand-prevention layer is 0.5-1 cm, and the gap width, at the narrowest position, of each flow guide gap is greater than or equal to 01mm. The novel foam metal sand-prevention pipe is good in permeability and high in strength, each flow guide gap with the outside narrow and the inside wide has the self-cleaning function, by means of the sand-prevention pipe, sand-prevention precision is greatly improved, the service life of the sand-prevention pipe is greatly prolonged, good flow guide capability is achieved, and the liquid flow is effectively increased.

The invention discloses a road drainage structure which comprises a permeable ground layer. More than one water collecting component is mounted on the upper surface of the permeable ground layer and is of a funnel-shaped structure, the tops of the water collecting components are fixed onto the lower surface of a drainage ground layer, the drainage ground layer is transversely arranged on the water collecting components, water guide components are vertically arranged in the permeable ground layer, correspond to the bottoms of the water collecting components and are communicated with the water collecting components, a permeable layer made of permeable concrete is arranged on the lower surface of the permeable ground layer and is connected with the permeable ground layer by cement mortar layers, a medium-sand leveling layer is arranged in the permeable layer made of the permeable concrete, and the thickness of the medium-sand leveling layer is a quarter of the thickness of the permeable layer made of the permeable concrete. The road drainage structure has the advantages that the road drainage structure is excellent in drainage performance and permeation performance and high in flow guide property and can be effectively applied to municipal road drainage; drainage devices can be prefabricated, accordingly, the construction periods can be effectively shortened, the labor intensity can be relieved, certain costs can be saved, and destruction to the bearing capacity of roads can be prevented.

The invention discloses a method for guiding plugging agents into an oil well for water plugging by radial wells, and belongs to the field of oil production engineering in oil development. The methodcomprises the following step that the orientation of the radial wells, the length of the radial wells, numbers of the radial wells, dosage of the plugging agents and injection displacement are determined. The method for guiding the plugging agents into the oil well for water plugging by the radial wells changes the flow line of the plugging agents along a producing well as radial flow in a traditional general injection method to the radial flow along the radial wells in a flow advantage band, the precise delivery of the plugging agents is realized, and the damage to an oil reservoir is reduced. The radial wells have high flow conductivity and can be regarded as pipe flow, compared with the formation seepage flow, the injection pressure to the depth of the formation is greatly reduced, andthe effects of decompression and increasing injection are achieved. The method for guiding the plugging agents into the oil well for water plugging by the radial wells can realize the precise deliveryof the plugging agents in the flow advantage band and the decompression and increasing injection, and is of great significance for improving the water plugging effect of the oil well.

The invention discloses a method for improving development of a coal underground gasification gas cavity by applying a double-pinniform horizontal well. The method comprises the following steps that S1, a gas inlet hole of a gas injection well is constructed; S2, a horizontal branch well of the gas injection well is constructed; S3, a production well gas production hole is constructed; S4, horizontal branch wells of the production well are constructed; S5, auxiliary holes are constructed; S6, auxiliary devices such as an ignition device, a gasifying agent injection device and a retreating device are put down through a wellhead of the injection well; S7, a gasifying agent is injected into the horizontal branch well points for ignition; S8, after gasification cavities of the two adjacent horizontal branch wells at the finger tip communicate with each other, the auxiliary devices are arranged at the horizontal branch well points of the middle and rear section, and the steps S5-S8 are repeated till coal bed gas cavities of all the horizontal branch wells are integrally gasified and communicated; and S9, an air extractor is installed at the ground end of the production well. The using method can break through the limitation of point or line range injection and production of a vertical well and a horizontal well, a coal seam fracture system is communicated in a large range, the reaction contact area is increased, and the gas production rate is increased.

A ternary distortion-type groove end surface mechanical sealing structure comprises a dynamic ring and a static ring which are used for mechanical sealing, ternary distortion-type grooves 1 evenly distributed in the circumferential direction are machined in the sealing end surface of at least one sealing ring of the dynamic ring and the static ring, and each ternary distortion-type groove is formed by two side walls and a three-dimensional distortion variable-depth groove bottom surface; the side walls of each ternary distortion-type groove comprise the windward side ternary distortion wall surface 11 and the leeward side ternary distortion wall surface 13, and the three-dimensional distortion variable-depth groove bottom surfaces 12 gradually shallow in a distortion shape from the outer circumferential side walls of the sealing rings to the centers of the sealing rings and intersect with the sealing end surfaces on the outer sides of sealing dams 3; the intersection lines of the side walls of the ternary distortion-type grooves 1 and the outer circumferential side walls of the sealing rings are perpendicular to the sealing end surfaces; the intersection lines of the side walls of the first ternary distortion-type grooves and the sealing end surfaces are each divided into two sections, the intersection lines on the medium inlet sides are helical lines, and the intersection lines on the medium leakage sides are radial straight lines.

The invention discloses an anti-blocking water conservancy pipe structure. The anti-blocking water conservancy pipe structure comprises a water outlet pipe, a buffer table is arranged on the inner wall of the water outlet pipe, and the buffer table and the water outlet pipe are integrally connected; a wear-resisting plate is arranged on one face, opposite to the inner wall of the water outlet pipe, of the buffer table and fixed to the buffer table, a water guide pipe is arranged at one end of the water outlet pipe and connected to the water outlet pipe in a sealing manner, a flow guide opening is formed in the water guide pipe, and the flow guide opening and the water guide pipe are integrally connected; and an inner pipe is arranged at one end, opposite to the water guide pipe, of the water outlet pipe and connected with the water outlet pipe through a detachable piece. The anti-blocking water conservancy pipe structure is compact in structure, firm in connection, high in flow guide performance and not prone to generating blockage; a certain buffer and flow guide effect can be achieved; meanwhile, whether the inner tube needs to be dismounted in use or not can be selected according to actual demands on site; and the using flexibly is greatly strengthened.

The invention discloses a sand-carrying fiber and preparation and application thereof. The sand-carrying fiber is a polylactic acid fiber and is prepared from the following raw materials in parts by mass: 100 parts of polylactic acid (PLA), 12 to 16 parts of poly-p-phenylene terephthamide, 3 to 5 parts of sodium dodecyl benzene sulfonate, 2 to 5 parts of citric acid, 15 to 23 parts of polyvinyl alcohol, 10 to 22 parts of glycerin monostearate, 15 to 25 parts of polyethylene glycol, 10 parts of magnesium phosphate-fibrin glue and 2 to 3 parts of zinc chloride. The sand-carrying fiber has the characteristics of simple process route, good sand-carrying performance, strong flow conductivity, excellent dispersity and the like, and the loss of fracturing fluid can be effectively reduced. Magnesium phosphate-fibrin glue and zinc chloride are added into the fiber polymer, so that the prepared sand-carrying fiber has better toughness and solubility.