CN200982156Y - Aerating artesian well gas injection device - Google Patents

Abstract

The utility model relates to a well drilling down-hole device for the oil field ground layer pressure lacking area, in particular to the down-hole device of the directional well drilling, comprising a bulk 1, a wrap 2, a piston 3, an O-ring seal 4, a spring 5, a caulking ring 6, a lower seal ring 7 and a lower stressed top 8, wherein the outer side of the bulk 1 is provided with a wrap 2, the top of the wrap 2 is connected with the bulk via the screw thread. The piston 3, spring 5, lower seal ring 7 and lower stressed top 8 are provided in the spacing between the bulk 1 and the wrap 2 up and down. The packing ring groove on the piston 3 is installed with the O-ring seal 4, and the middle of the spring 5 is provided with the caulking ring 6. The outer side of the lower stressed top 8 is fixedly connected with the lower end of the wrap 2 via the screw thread. The device is reasonable in design, and is reliable in working. Utilizing the device can guarantee that the circulating medium of the drill rod center is in the pure liquid condition during the horizontal well and the oriental well drilling. The limitations that the aerated well drilling can not be controlled by the well bore track, and the down-hole power drilling tool can not work normally in the condition of aerated slurry, are relieved. The aerated well drillings of the horizontal well and the oriental well are realized all right.

Description

A kind of air-filling well-drilling gas injection device

Technical field:

The utility model relates to a kind of particularly downhole hardware of directional well drilling of oil field stratum pressure regional drilling well in debt that is used for.

Background technology:

Along with oil field development enters the middle and later periods, numerous main force's block strata pressures is in debt serious, the problems such as pollution of leakage, bit freezing, oil reservoir become one of middle and later periods drilling technology difficult point, and low-pressure drilling technology is to solve the of paramount importance technical support of this class strata drilling difficult problem.The air-filling well-drilling technology is as a branch of low-pressure drilling technology series, can prevent effectively that leakage, bit freezing and construction technology are simple, running cost is low and obtains promoting with it.But in actual application, also there is certain problem at present, because need charge into air, do not satisfy the signal transmission of wireless drilling measurer in the hole trajectory control process for the drilling rod gas injection of routine, and because must use ball-and-seat, make wired drilling to implement, this has just limited the application of air-filling well-drilling in directed drillings such as horizontal well, sidetrack horizontal well and Multilateral Wells.

The utility model content:

The utility model purpose is to provide a kind of can avoid producing gas-liquid mixed state and use ball-and-seat in drill string, make wireless or wired drilling becomes feasible to hole trajectory control, thereby guarantees the air-filling well-drilling gas injection device that air-filling well-drilling is used in directed drilling smoothly.

The purpose of this utility model is achieved in that this kind gas injection device is made up of body, overcoat, piston, O-ring seal, spring, spacer ring, lower sealing ring and lower cover, and the body outside is provided with overcoat, and outer set upper side is connected with body with screw thread; Be provided with piston, spring, lower sealing ring and lower cover in the space between body and the overcoat from top to bottom, in the seal groove on the piston sealing ring be housed, be provided with spacer ring in the middle of the spring, the lower cover outside is connected to a fixed with screw thread and overcoat lower end.In the wellbore construction process, this device is connected on the internal layer protective casing tubing string G.I.H thereupon, after accurate Calculation design cement returns height, notes the control cement amount of squeezing into, be not fixed in the inside and outside layer of protective casing superposition section to guarantee this device.Like this, just can utilize annular clearance between the inside and outside two-layer protective casing as the gas injection channel of air-filling well-drilling technology, allow mud that pumps into from borehole pump and the gas that injects from air compressor mix at gas injection joint, reach the purpose that reduces shaft bottom annular space circulating pressure by reducing the above fluid column effective pressure of this joint, thereby realize creeping into of low pressure oil gas reservoir.Under this special method of gas injection, the fluid in the drilling rod constitutes single pure liquid phase mud, make wireless or wired drilling smooth to the control of horizontal well, directional well well track.

The utility model is reasonable in design, reliable operation, utilize it can guarantee that the circulatory mediator at drilling rod center in horizontal well, directional well drilling process is in pure liquid phase state, remove the restriction that air-filling well-drilling is subjected to the uncontrollable and mud motor cisco unity malfunction under the fluffy mud state of well track, realize carrying out smoothly of horizontal well, directional well air-filling well-drilling.

Description of drawings:

Accompanying drawing is a structural representation of the present utility model.

The specific embodiment:

The utility model is provided by following examples, below in conjunction with accompanying drawing the utility model is further described.

As shown in the figure, the utility model is made up of body 1, overcoat 2, piston 3, O-ring seal 4, spring 5, spacer ring 6, lower sealing ring 7 and lower cover 8, its structure, assembled relation are as follows: body 1 outside is provided with overcoat 2, and overcoat 2 upper ends are connected with body 1 with screw thread; Be provided with piston 3, spring 5, lower sealing ring 7 and lower cover 8 in the space between body 1 and the overcoat 2 from top to bottom, O-ring seal 4 is housed in the seal groove on the piston 3, be provided with spacer ring 6 in the middle of the spring 5, lower cover 8 outsides are connected to a fixed with screw thread and overcoat 2 lower ends.Wherein, body 1 is a pipe body, and its upper and lower end is respectively equipped with to be connected with the internal layer protective casing uses external screw thread, and the middle part periphery has a conical surface transition section and has big slightly section of externally threaded external diameter, the big slightly section below of external diameter is provided with two undergauge steps, injection hole 10 in having on the tube wall of step below.Overcoat 2 is that a upper and lower end is respectively equipped with the union body that is connected the usefulness internal thread with body 1 with lower cover 8, and its top has outer injection hole 9.Piston 3 is the torus that inside and outside disc is provided with seal groove, places between body 1 interior injection hole 10 and the overcoat 2 outer injection holes 9.

Claims (1)

1, a kind of air-filling well-drilling gas injection device, form by body (1), overcoat (2), piston (3), O-ring seal (4), spring (5), spacer ring (6), lower sealing ring (7) and lower cover (8), it is characterized in that: body (1) outside is provided with overcoat (2), and overcoat (2) upper end is connected with body (1) with screw thread; Be provided with piston (3), spring (5), lower sealing ring (7) and lower cover (8) in the space between body (1) and the overcoat (2) from top to bottom, O-ring seal (4) is housed in the seal groove on the piston (3), be provided with spacer ring (6) in the middle of the spring (5), lower cover (8) outside is connected to a fixed with screw thread and overcoat (2) lower end.

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