Abstract: A method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production comprises the following steps: (1) injecting a filling liquid carrying pack-off particles into a wellbore and a fracture via a wellhead, until a stratum crack/fracture extension pressure is reached or exceeded, or until an injection amount per unit injection pressure is close to zero, or until a preset filling amount of pack-off particles is reached; (2) launching production.

Abstract: A method for filling an oil and gas well of a fractured oil and gas reservoir with pack-off particles to reduce water and increase oil production comprises the following steps: (1) injecting a filling liquid carrying pack-off particles into a wellbore and a fracture via a wellhead, until a stratum crack/fracture extension pressure is reached or exceeded, or until an injection amount per unit injection pressure is close to zero, or until a preset filling amount of pack-off particles is reached; (2) launching production. The present invention efficiently addresses the problem of water channeling and water production existing in various fractures, by direct filling and recovery filling of the fractures, directly filling of the annular space, and filling from the water injection well to the production well.

Abstract: A method and a system for segmental flow control in an oil-gas well are disclosed. The oil-gas well includes a first annular space (111) and a second annular space (103). The first annular space (111) is formed with the space between the borehole wall (101) of the oil-gas well and a perforated tube (102) which is in the oil-gas well and extends along an axial direction of the oil-gas well; The second annular space (103) which is formed with the space between the perforated tube (102) and a flow-control filter string (105) which is in the perforated tube (102) and extends along the axial direction of the oil-gas well. The method includes filling anti-channeling isolating particles (109) in the first annular space (111) and the second annular space (103) to enable fluid to flow in the first annular space (111) and the second annular space (103) filled with the anti-channeling isolating particles (109) in the manner of seepage.

Abstract: An oil-gas well structure and a segmental flow-control method for a flow-control filter string (5) used in the oil-gas well. The segmental flow-control method for the flow-control filter string (5) comprises the following steps: 1) establishing a channel (2-1); 2) running the flow-control filter string (5); 3) filling with the anti-channeling flow pack-off particles (7); 4) sealing; 5) disconnecting a run-in string connected to the flow-control filter string (5). The segment flow control of the flow-control filter string (5) is achieved by using a pack-off effect of the anti-channeling flow pack-off particles (7).

Abstract: Anti-channeling pack-off particles used in a production section of an oil-gas well, a completion method, and a production method are provided. The anti-channeling pack-off particles are macromolecule polymer particles having an average particle diameter of 0.05-1.0 mm and a real density of 0.8-1.4 g/cm3. The particles are compactly filled into a space of the oil-gas well, which is required to be filled and packed off so that there is no channeling path after filling, thus effectively pack-off or sectioning the oil-gas well into multiple, relatively independent regions for production from the oil-gas well, and thus improving the production efficiency of the oil-gas well.

Abstract: A segmental flow-control method for a flow-control filter string in an oil-gas well and an oil-gas well structure are disclosed. The oil-gas well includes a well wall(1), a casing(2) located in the well wall(1), a cement sheath(3) provided between the casing(2) and the well wall(1), channeling path(5) existing outside the casing(2), and a plurality of perforated tunnels (6) passing through the casing(2), the cement sheath(3) and/or the channeling path(5) and into a formation from the inside of the casing to the formation.

Abstract: A method and a system for segmental flow control in an oil-gas well are disclosed. The oil-gas well includes a first annular space (111) and a second annular space (103). The first annular space (111) is formed with the space between the borehole wall (101) of the oil-gas well and a perforated tube (102) which is in the oil-gas well and extends along an axial direction of the oil-gas well; The second annular space(103) which is formed with the space between the perforated tube(102) and a flow-control filter string (105) which is in the perforated tube(102) and extends along the axial direction of the oil-gas well. The method includes filling anti-channeling isolating particles (109) in the first annular space (111) and the second annular space (103) to enable fluid to flow in the first annular space (111) and the second annular space (103) filled with the anti-channeling isolating particles (109) in the manner of seepage.

Abstract: An oil-gas well structure for facilitating extracting a downhole filter string and a method for extracting the downhole filter string from the oil-gas well are provided. The oil-gas well structure includes a borehole wall (1) of the oil-gas well and a downhole filter string (2) run into the oil-gas well. The end of the downhole filter string (2) close to a wellhead is fixedly connected with the borehole wall (1). An annulus is formed between the downhole filter string (2) and the borehole wall (1), and the annulus is filled with ultra light particles, wherein, the density of ultra light particles approaches or is equal to the density of the carrier fluid which carries the ultra light particles. The method for extracting the downhole filter string includes the following steps: 1) establishing channels; 2) injecting the carrier fluid for ultra light particles so as to remove the ultra light particles from the annulus completely; 3) extracting the downhole filter string.

Abstract: An oil-gas well structure and a segmental flow-control method for a flow-control filter string (5) used in the oil-gas well are disclosed. The oil-gas well comprises a well wall (1) and a sand control screen (2) already run within the well wall, a clearance at least partially exists between the sand control screen (2) and the well wall (1), the flow-control filter string (5) is run into the sand control screen (2), the flow-control filter string (5) is provided with flow-control filters (6), an annular space is formed between the flow-control filters (6) and the sand control screen (2), and the clearance and the annular space are filled with anti-channeling flow pack-off particles (7).

Abstract: A segmental flow-control method for a flow-control filter string in an oil-gas well and an oil-gas well structure are disclosed. The oil-gas well includes a well wall(1), a casing(2) located in the well wall(1), a cement sheath(3) provided between the casing(2) and the well wall(1), channeling path(5) existing outside the casing(2), and a plurality of perforated tunnels (6) passing through the casing(2), the cement sheath(3) and/or the channeling path(5) and into a formation from the inside of the casing to the formation.

Abstract: Anti-channeling pack-off particles used in a production section of an oil-gas well, a completion method, and a production method are provided. The anti-channeling pack-off particles are macromolecule polymer particles having an average particle diameter of 0.05-1.0 mm and a real density of 0.8-1.4 g/cm3. The particles are compactly filled into a space of the oil-gas well, which is required to be filled and packed off so that there is no channeling path after filling, thus effectively pack-off or sectioning the oil-gas well into multiple, relatively independent regions for production from the oil-gas well, and thus improving the production efficiency of the oil-gas well.

Abstract: A method and a system for segmental flow control in an oil-gas well are disclosed. The oil-gas well includes a first annular space (111) and a second annular space (103). The first annular space (111) is formed with the space between the borehole wall (101) of the oil-gas well and a perforated tube (102) which is in the oil-gas well and extends along an axial direction of the oil-gas well; The second annular space (103) which is formed with the space between the perforated tube (102) and a flow-control filter string (105) which is in the perforated tube (102) and extends along the axial direction of the oil-gas well. The method includes filling anti-channeling isolating particles (109) in the first annular space (111) and the second annular space (103) to enable fluid to flow in the first annular space (111) and the second annular space (103) filled with the anti-channeling isolating particles (109) in the manner of seepage.

Abstract: A flow control screen for use in oilfield exploitation comprises: a base pipe (1) provided with a base pipe inlet (11) thereon; a filter pipe (2) sleeved over the base pipe (1); a flow guide layer (3) formed between the base pipe and the filter pipe; and a flow control device (4) including an inlet (41) of the flow control device, a flow control channel (42) and an outlet (43) of the flow control device, wherein the inlet of the flow control device is in fluid communication with the flow guide layer, and the outlet of the flow control device is in fluid communication with the base pipe inlet. The pipe is simply structured and cost-effective, and effectively meets the requirements in oil production.