METHOD OF MULTISTAGE PRESSURE TESTING OF PIPES IN WELL AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC E21B33/10 

FIELD: oil industry.

SUBSTANCE: group of inventions relates to oil industry and can be used for testing by internal pressure (pressure testing) of drilling or tubing string in well. Device for multistage pressure testing of pipe suspension in well includes housing equipped with connecting threaded elements for integration into suspension of pipe string, concentrically located in housing bushing, with equipped mounting surface for throw-off shutoff element. Casting elements are made from strong solid corrosion-resistant material of spherical shape, with minimum deviation of outer diameter from device size selected for crimping. Sleeve is converted into bushing-draw plate, on outer surface of which there is a conical section enveloped with adjusting ring having congruent taper. Adjusting ring is installed with possibility of axial movement and external compressing action on outer diameter of bushing-spinneret for correction of inner diameter of bushing-spinneret and change of rigidity of its body. Inner part of spinneret, on section with external conicity, has local cylindrical narrowing, inner diameter of which is performed taking into account requirements of pressure of pressing. Upper part of the spinneret-bush is equipped with an external thread for installation in the body of the device and provision of tightness of the lower end face of the bushing-spinneret with thrust collars of the body of the device, through the lining provided for these purposes. Container for catching of spent balls is fixed below the body of the device by means of thread.

EFFECT: technical result is simplification of design, preliminary adjustment of device by pressure of pressure test, absence of movable elements, increased reliability of operation, reduced time of pressing operations.

2 cl, 4 dwg