Development and Promotion of Mechanical "Sand Screen" in Deep Well Ultra Deep Shaft Electric Pumping Technology

I. Overview:
For the oil layer in the 3500m ~ 6000m, the formation temperature of 100 ~ 146 ℃ in the oil field, loose reservoirs, easy to sand and contains CO2 and other corrosive media, which determines the characteristics must be selected high strength, high permeability, good deflection, deformation capacity Strong, high temperature resistance and corrosion resistance of the strong "sand screen."

Through certain research and access to a large amount of information, we think: the best selection of 13Cr base tube or super 13Cr; filter section using ultra-thin stainless steel mesh composite filter. This measure will greatly improve and enhance the comprehensive capabilities of sand control, sand filter, corrosion resistance, high temperature resistance and deformation resistance.

If the "sand control screen" stable performance, reliable structure, which will greatly reduce excessively rely on the "electric pump" performance, which can reduce the "pump" unit cost. In view of the increasing sanding sand in the electric pump well, the hanger is used to seat the sand control pipe in the middle of the oil well or hang at the tail of the electric motor to prevent sand from entering the pump body and the oil pipe to improve the operating environment of the electric pump unit , Which will greatly extend and improve the working life of the pump unit operation.

Second, the sand screen technology 1, sand control structure: from the inside out by the base pipe, composite sand filter and stainless steel outer sheath and other components. Base pipe using API standard casing or tubing; sand filter cover made of multi-layer stainless steel microporous mesh structure made of advanced welding technology and base pipe welding. Forming a set of high permeability, high strength, high deformation capacity, and high corrosion resistance advantages, and has reliable performance, is one of the high-tech in the field of mechanical sand control.

2, the protective cover with lateral flow hole (1) in the operation process, can well protect the sand control filter layer, to prevent down the sand control filter is punctured, hanging bad caused by the failure of sand control construction.
(2) In the course of work, to prevent fluid erosion of the direct erosion of the sand screen.

3, composite sand filter (1) multi-layer 316L stainless steel precision microporous composite sand control filter, sand high reliability, strong anti-sabotage.
(2) Large filter area, 10 times for slotted screens and wire screens, low flow resistance and high output.
(3) The filter hole is stable, anti-deformation ability is strong, and when the radial deformation is 40%, the sand control ability is unchanged, which meets the requirements of the horizontal well.
(4) uniform filter, high permeability, anti-blocking ability, plug cycle is 2 to 3 times the normal screen, and easy to backwash.
(5) small diameter, light weight, easy to push in place on long horizontal distance.

4, material and anti-corrosion performance (1), for the general requirements, the base pipe using API standard casing or tubing, made of J55, N80 and other steel grade, sand filter and outer sheath are made of high quality stainless steel.
(2) For the special requirements of H2S, CO2 and high Cl-wells, the base pipe is made of corrosion-resistant casing or oil pipe or even stainless steel pipe. The sand filter cover and the outer protective cover are made of high quality stainless steel.
(3) For deep or ultra-deep wells, the base pipe is 13Cr or super 13Cr; the filter section is made of ultra-thin stainless steel mesh or direct use of the punch sleeve. This measure will greatly improve and enhance the comprehensive capabilities of sand control, sand filtration, corrosion resistance, high temperature resistance and deformation resistance.

Third, the sand control media and filtration precision sand control media GLJD60 GLJD80 GLJD100 GLJD120 GLJD160 GLJD200 GLJD250 GLJD300 GLJD350
Filtration accuracy (μm) 60 300 350

Fourth, the technical parameters (1), the base pipe for the API standard casing or tubing, the anti-sabotage pressure to API technical requirements, the elongation rate of 2%, 60% of the radial deformable, torsional deformation of 1 degree / m, bending deformation 1 degree / meter
(2) The sand filter layer is a multi-layer stainless steel mesh composite filter material. Its elongation, radial deformability, torsional deformation and bending deformation are both larger than that of the API pipe.
(3) The overall compressive tensile strength of the sand control pipe after welding reaches more than 90% of the base pipe strength

Fifth, the basis of precision microporous composite filter tube base tube size weight (? / M) diameter weight (? / M)
23 / 8in 6.85 3.0in (76mm) 12
27 / 8in 9.54 3.5in (89mm) 15
31 / 2in 13.7 4.4in (112mm) 20
4in 14.2 4.9in (124mm) 22
41 / 2in 17.3 5.4in (138mm) 25
5in 22.4 5.9in (150mm) 30
51 / 2in 25.3 6.4in (162mm) 35
65 / 8in 35.8 7.5in (192mm) 46
7in 38.7 7.9in (201mm) 50
Note: Base tube length and specifications according to user requirements to determine;