The utility model provides a variable-diameter sliding sleeve switch. The variable-diameter sliding sleeve switch comprises an upper connector, a lower connector and a sliding sleeve, wherein the sliding sleeve can slide in the upper connector and the lower connector, the upper connector and the lower connector are fixedly connected in a sealing way, a first liquid outlet and a second liquid outlet are sequentially formed in the upper connector from top to bottom, the sliding sleeve is connected with the upper connector through a sliding sleeve shear pin, and the sliding sleeve shear pin is positioned at the upper end of the first liquid outlet; the middle part of the upper connector is also sequentially provided with an upper sealing ring, a lower sealing ring, a lining and an elastic piece from top to bottom in a sleeving way, the upper sealing ring is fixedly connected with the upper connector, the upper sealing ring is in sealing contact with the lower sealing ring, a sealing contact position of the upper sealing ring and the lower sealing ring is positioned in an outlet position of the second liquid outlet, the lower sealing ring is fixedly connected with the lining, the lining is fixedly connected with the elastic piece, and the elastic piece is fixedly connected with the lower connector. According to the variable-diameter sliding sleeve switch provided by the utility model, the structure is simple, the use is convenient, the aperture size of the first liquid outlet and the second liquid outlet can be changed according to different pressure during a using process, and the demands of plenty of sand fracturing construction are met.

Variable-diameter sliding sleeve switch

The invention provides a testing device of a sleeve external packer. The testing device comprises a testing outer tube, wherein the testing outer tube is a hollow tube column; the two ends of the testing outer tube are respectively and fixedly connected with a fastening screwed plug I and a fastening screwed plug II through threads, so as to form closed cavities; a testing piece sleeve external packer is arranged in the cavity of the testing outer tube; the lower end of the sleeve external packer is sealed and connected with a plug, so as to form a closed space; a pump connector connected with a pressure testing pump is mounted on the fastening screwed plug II; The testing device can perform effective division, guarantees the normal proceeding of construction, can effectively accomplish the simulation test before the field application of the sleeve external packer, is simple to operate and high in reliability, and can ensure that the sleeve external packer achieves the intended use in field application after testing.

Testing device of sleeve external packer

The invention discloses a method for centering a horizontal well cementing casing pipe, which is achieved by an expansion casing pipe centralizer. The method comprises the following steps: connecting a guiding shoe and a ball seat to a casing string before the construction, according to the construction design requirement, connecting an expansion casing centralizer to the horizontal section casing pipe, placing the casing string equipped with the guiding shoe, the ball seat and the expanding casing centralizer down to the well, putting steel ball and increasing the pressure, expanding the expansion centralizer, supporting the well wall, continuing to increase the pressure, suppressing off the ball seat, establishing circulation inside and outside of the casing, cementing and completing the well. During the construction, the expansion casing centralizer and the well completing tool are connected together, the maximum outer diameter of the centralizer is consistent with the outer diameter of the well completing tool, therefore, the centralizer does not scratch the well wall, does not form an arch groove in the horizontal section, can support the well wall to be centralized in the horizontal section casing and increase the horizontal well cementing quality effectively.

Method for centering horizontal well cementing casing pipe

The invention belongs to the technical field of down-hole packer indoor detection, and particularly relates to an open hole packer tri-ellipsoid test device. The open hole packer tri-ellipsoid test device comprises a tri-ellipsoid test casing pipe, a casing pipe upper connector, a central pipe booster connector, an upper cavity booster port, a lower cavity booster port, a test packer, a test medium, a test well casing pipe, a wellhead upper connector and a test well casing pipe lower plug. The cross section of the inner wall of the tri-ellipsoid test casing pipe is an irregular ellipse, the problems that the property evaluation method of an open hole packer in the prior art is not uniform in standard, the open hole packer in the prior art cannot actually simulate the environment under the shaft, so that the sectional fracturing effect is affected are solved. Relative to a common circular casing pipe, the test device is much closer to the real environment under the shaft, the packer which is tested to be qualified can ensure that the sectional packing is reliable in the fracturing construction process, the sectional fracturing effect is ensured, and evidences are provided for improving the sealing capability of the open hole packer in an irregular borehole. The utilized open hole packer tri-ellipsoid test device can provide different test temperatures according to differences of test media, and is wide in application range.

Open hole packer tri-ellipsoid test device

The invention relates to the technical field of construction of a gasoline station in an oil field, in particular to a connecting method for an oil-submerged pump oiling machine with an intercepting valve and an oil supply pipeline. The method comprises the following steps of: 1, carrying out preparation work, i.e. using a seamless steel tube with a diameter of 40mm as a length regulation nipple, wherein the length of the length regulation nipple is the sum of L1, H and h, L1 represents a spacing between an upper pipe orifice of the oil supply pipeline and the intercepting valve of the oiling machine, H represents a regulation length and h represents a length of a screw thread; and 2, sequentially carrying out installation, i.e. connecting the lower end of the intercepting valve and the length regulation nipple, inserting the length regulation nipple into the oil supply pipeline with a diameter of 50mm and connecting the upper end of the intercepting valve and an oiling machine connecting piece. According to the invention, the effect that the oiling machine does not need to be lifted is implemented; construction difficulty is reduced; installation deviation is small; consumption of manpower and material resources is saved; and construction efficiency is greatly improved. The defects of difficulty in implementation, consumption of manpower and material resources and reduction of construction efficiency of an existing connecting method for the oiling machine and the oil supply pipeline are overcome.

Connecting method for oil-submerged pump oiling machine with intercepting valve and oil supply pipeline

The utility model relates to an inner pipe series tool external inflatable casing packer in the oil well completion field, which is characterized by comprising an upper expanding internal casing packer (1), a constant pressure valve (2), a lower expanding internal casing packer (3), a horizontal well ball seat (4), guide shoes (5), a connecting piece and an oil pipe with a diameter of 73, wherein the upper expanding internal casing packer (1) is connected with the lower expanding internal casing packer (3) through the oil pipe with a diameter of 73 and the constant pressure valve (2); the lower expanding internal casing packer (3) is connected with the horizontal well ball seat (4) through the oil pipe with a diameter of 73; the lower end of the horizontal well ball seat (4) is connected with the guide shoes (5) through the oil pipe with a diameter of 73; and the upper expanding internal casing packer (1), the constant pressure valve (2) and the lower expanding internal casing packer (3) adopt hollow bodies. The utility model can effectively improve the setting success rate of the external casing packer and immediately evaluate the setting effect. Meanwhile, the external inflatable casing packer has the advantages of stable performance, low risk and high reliability.

Inner pipe series tool external inflatable casing packer

The utility model discloses a stage cementing device without drilling plugs, which comprises a body, a closing sleeve, a lower connector, a shear pin, a positioning key, an outer sliding sleeve and an inner sliding sleeve, wherein the upper end of the body is connected with a casing pipe in a threaded mode, the lower end of the body is connected with the upper end of the lower connector in a threaded mode, the inner sliding sleeve, the closing sleeve and the outer sliding sleeve are respectively arranged in an inner cavity of the body from inside to outside, the shear pin penetrates through the inner sliding sleeve, the closing sleeve and the outer sliding sleeve, the top end of the shear pin extends into a shear pin groove arranged on the body, the positioning key is positioned in a positioning key hole on the outer sliding sleeve, and the bottom of the positioning key is positioned on a positioning key groove on the closing sleeve. By the aid of the stage cementing device, after well cementing operation is completed, operators do not need to drill and remove the cement plugs, so that a construction working process after well cementation is simplified, and cost is reduced.

Stage cementing device without drilling plugs

The utility model relates to a constant pressure valve used for well completion in the oil production industrial oil and gas well completion operation field, which is characterized in that a sliding sleeve (6) is arranged between a central tube (8) and an outer cover (2); the central tube (8) is provided with two deflector holes at the sliding position of the sliding sleeve (6); the central tube (8) is sequentially sleeved with an adjusting cap (10) and a spring (9); the adjusting cap (10) and the spring (9) are limited between a convex plate at the bottom of the sliding sleeve (6) and a protruding ring at the bottom of the central tube (8); inner screw thread of a protruding ring at the tail of the central tube (8) is connected with a pipe nipple (11) by screw thread; one end of the sliding sleeve (6) is provided with a liquid inlet tank; the middle of the sliding sleeve (6) is provided with the deflector holes which are communicated with the liquid inlet tank; and the length of the sliding sleeve (6) is larger than the compression length of the spring (9). The utility model can complete opening action effectively and accurately in the section operation of the horizontal well, and realize pressure adjustment by resetting after pressure relief.

Constant pressure valve used for oil field well completion

The utility model belongs to the technical field of petroleum and gas well cementing and completion tools, and particularly relates to an external casing packer control valve system. The system comprises a locking valve, a check valve and a pressure-limiting valve, and the locking valve, the check valve and the pressure-limiting valve are arranged on a valve body. The bottom of a valve hole of the locking valve is communicated with a liquid inlet channel I, the valve hole of the locking valve is communicated with the bottom of a valve hole of the check valve through a liquid inlet channel II, the valve hole of the check valve is communicated with a valve hole of the pressure-limiting valve through a liquid inlet channel III, the valve hole of the pressure-limiting valve is communicated with a liquid inlet channel IV communicated with an expansion cavity of a packer rubber sleeve, and the bottom of the valve hole of the pressure-limiting valve is communicated with a liquid return channel communicated with the rubber sleeve. Each valve is simple in structure, reliable in sealing and flexible to open. Liquid in the rubber sleeve is prevented from flowing back due to the dual cutting-off and uniflow functions of the locking valve and the check valve, and permanent sealing is achieved. The control valve system is simple in structure and high in reliability, can effectively prevent the risk that the valve system fails in construction, and guarantees normal construction.

External casing packer control valve system

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