CN101148974A - Horizontal well sheath repairing tool - Google Patents

Abstract

The horizontal well casing repairing tool for overhaul of oil well consists of one central pipe comprising thread connected sections, one outer pipe capable of sliding along the central pipe, one repairing unit comprising expanding pipe, sealing pipe, repairing pipe, and other part, one pawl spring with six pawls, two or three righting mechanisms, etc. It is applied in repairing horizontal well casing.

Description

A kind of horizontal well sheath repairing tool

Technical field:

The present invention relates to a kind of horizontal well sheath repairing tool that a kind of oilfield overhaul horizontal well is used.

Background technology:

Casing patching technology and subsidy instrument are varied both at home and abroad at present, as hydraulic expanding tube formula, self-hanging, bellows-type etc.Various subsidy instruments have the pluses and minuses and the scope of application separately, wherein hydraulic expanding tube formula subsidy tool construction complexity and built-in lock dog easily block, self-hanging subsidy instrument is applicable to thermal production well, but latus rectum is too little in the subsidy back, though and the interior latus rectum after the subsidy of bellows-type subsidy instrument is bigger, but intensity is lower, the expansion tube subsidy is present state-of-the-art sleeve pipe repair mode, but China also fails independent development, and subsidy appropriate litigation fees height, above-mentioned all sheath repairing tools all are not suitable for the casing patching operation of horizontal well except that the expansion tube subsidy.At present along with oilfield horizontal well, special wells drilling hole number such as Multilateral Wells are increasing, such leakage is lost, damaged situation is also increasing, had a strong impact on the ordinary production of oil well, and because when horizontal well construction, when being lowered to high angle hole section and net horizontal section, instrument can run into very big resistance,, present existing subsidy instrument and technology thereof finish the casing patching operation of horizontal well so all can't overcoming this resistance, therefore, for casing leakage and damaged horizontal well are resumed production as early as possible, we develop with sheath repairing tool horizontal well on the basis of hydraulic expanding tube formula subsidy instrument, and development and design becomes " a kind of horizontal well sheath repairing tool ", through State Intellectual Property Office's retrieval, the conclusion that is numbered GO071241 is for having novelty and creativeness.

Summary of the invention:

The purpose of this invention is to provide a kind of horizontal well sheath repairing tool, this instrument has solved present existing subsidy instrument and technology can't solve horizontal well casing pipe leakage and damaged casing patching problem.

The technical solution adopted for the present invention to solve the technical problems is: to horizontal well sheath repairing, because the pressure of the drill is difficult to be applied on the instrument of big gradient section and horizontal segment, adopt the mechanical system subsidy to be difficult to realize, therefore the present invention adopts multistage hydraulic cylinder that the power smooth transfer is subsidized to the expand tube place, in addition when subsidizing the tool construction design, on its outer wall, designed " 4～6 cover " ball righting mechanism, it can play on the one hand and make instrument centralizing function placed in the middle, the aspect is when being lowered into high angle hole section and net horizontal section in addition, the subsidy instrument is contacted with the face of cylinder of well inner sleeve inwall become a contact, the frictional resistance in the time of can reducing into well so greatly; A kind of horizontal well sheath repairing tool mainly is made of fluid cylinder, expand tube sealing subsidy two parts, and every partial design has 2-3 cover ball righting mechanism; The fluid cylinder part can adopt 6-8 level fluid cylinder according to circumstances, mainly is made of shear pin, top connection, cylinder sleeve, piston etc.Main effect is by hydraulic pressure expansive force to be passed to the expand tube place; Expand tube sealing subsidy part mainly is made of expand tube, sealed tube, subsidy pipe, central tube, pawl spring, lower contact, baffle ring, shearing ring etc., and wherein expand tube, sealed tube are symmetrical arranged up and down with respect to subsidy pipe, central tube; The ball righting mechanism mainly is made of ball, catch, hold-down screw.Its effect is to reduce instrument to go into the well frictional resistance.It is located at cylinder sleeve respectively, ball is set upright on the outer cylinder surface of parts such as box cupling and pawl spring.Its structure is to process 1 vertically on these several part outer cylinder surfaces, along circumferentially processing 4-6 rectangular channel, 1-3 of centre position processing in these rectangular channels, amount to 4-18 hemisphere nest, be used to place the steel ball, place catch on the ball, and also process ball-and-socket in the catch relevant position, catch is installed in the rectangular channel, and two ends tighten on outer cylinder surface with hold-down screw.The catch external diameter is set upright box cupling with its cylinder sleeve of installing, ball, the pawl spring external diameter is identical, and mounted ball protrudes in cylinder sleeve, ball is set upright box cupling, pawl spring external surface 2-3mm, and ball and ball-and-socket be matched in clearance, is convenient to ball and rolls in ball-and-socket.When subsidizing the well segment length less than 3m, the subsidy pipe box cupling that can not use the band ball to set upright on the subsidy pipe.When subsidizing the well segment length greater than 3m, the subsidy pipe box cupling that should adopt the band ball to set upright is managed two sections short subsidies and is connected, to reduce owing to the long resistance that produces of subsidy pipe; Pawl spring is a tubular structure, axially mills out 6 saturating grooves in the pawl spring lower end, and the pawl spring lower end circumferentially is divided into 6 pawls, and the external diameter of pawl is greater than pawl spring upper end external diameter, and is identical with the expand tube external diameter.Be that expand tube provides support power down when the effect of pawl spring is to subsidize, promote the upwards crowded sealed tube that expands of expand tube down; After being that also sealed tube is sealed in internal surface of sleeve pipe, fluid cylinder continues the downward application of force, promoting baffle ring cuts off shearing ring, pawl spring is descending, after 6 pawls in its lower end go downwards to ring shaped slot in the lower contact, when on when carrying instrument, pawl spring is stuck in this groove, under following expand tube effect, its reduced diameter, thus can trip out pit shaft smoothly.

The invention has the beneficial effects as follows, reasonable in design, novel structure, this instrument has strengthened setting upright between two parties function, and the use instrument of greatly reducing of spin goes into well resistance, can use in the bigger well section of hole angles such as high angle hole, horizontal well.

Description of drawings:

Accompanying drawing is an overall structure schematic diagram of the present invention

Among the figure 1, shear pin, 2, top connection, 3, cylinder sleeve a, 4, hold-down screw a, 5, ball, 6, catch, 7, hold-down screw b, 8, cylinder sleeve b, 9, piston, 10, cylinder sleeve c, 11, adjustable ring, 12, expand tube, 13, tube connector, 14, sealed tube, 15, the subsidy pipe, 16, box cupling, 17, ball is set upright box cupling, and 18, central tube, 19, pawl spring, 20, lower contact, 21, baffle ring, 22, shearing ring, 23, hold-down screw c.

The specific embodiment:

In the accompanying drawings, (A is the disconnecting line) a kind of horizontal well sheath repairing tool is set upright box cupling 17, central tube 18, pawl spring 19, lower contact 20, baffle ring 21, shearing ring 22, hold-down screw c23 by shear pin 1, top connection 2, cylinder sleeve a3, hold-down screw a4, ball 5, catch 6, hold-down screw b7, cylinder sleeve b8, piston 9, cylinder sleeve c10, adjustable ring 11, expand tube 12, tube connector 13, sealed tube 14, subsidy pipe 15, box cupling 16, ball and is formed; A whole set of central tube string is by being threaded: the piston 9, tube connector 13, box cupling 16, central tube 18 and the lower contact 20 that are top connection 2, multistage fluid cylinder successively.The outer exterior tube string of central tube string from top to bottom successively by multistage cylinder sleeve (a, b, c) 3,8,10, adjustable ring 11, go up expand tube 12, upper and lower sealed tube 14, expand tube 12, pawl spring 19 constitute down, the part of exterior tube string has each other passes through hold-down screw (a, b, c) 4,7,23 and shear pin 1 connects, between the cylinder sleeves at different levels, have plenty of and overlap, between adjustable ring 11 and last expand tube 12, following expand tube 12 and pawl spring 19, upper and lower expand tube 12 and upper and lower sealed tube 14, passing through of also having is threaded, and is threaded as sealed tube 14 and subsidy pipe 15.Whole exterior tube string can slide up and down along the central tube string, so that hydraulic coupling is passed to the expand tube place.This instrument shearing ring 22 bottom is threaded with lower contact 20, exterior tube was ganged up baffle ring 21 and was supported on the shearing ring 22, expand tube sealing subsidy part mainly is made of expand tube 12, sealed tube 14, subsidy pipe 15, central tube 18, pawl spring 19, lower contact 20, baffle ring 21, shearing ring 22 etc., and wherein expand tube 12, sealed tube 14 are symmetrical arranged up and down with respect to subsidy pipe 15, central tube 18; Pawl spring 19 is a tubular structure, axially mills out 6 saturating grooves in its lower end, and pawl spring 19 lower ends circumferentially are divided into 6 pawls, and the external diameter of pawl is greater than pawl spring upper end external diameter, and is identical with expand tube 12 external diameters.Be that expand tube provides support power down when the effect of pawl spring is to subsidize, promote the upwards crowded sealed tube 14 that expands of expand tube down; After being that also sealed tube 14 is sealed in internal surface of sleeve pipe, fluid cylinder continues the downward application of force, promoting baffle ring 21 cuts off shearing ring 22, pawl spring 19 is descending, after 6 pawls in its lower end go downwards to ring shaped slot in the lower contact 20, when on when carrying instrument, pawl spring 19 is stuck in this groove, under following expand tube effect, its reduced diameter, thus can trip out pit shaft smoothly; This instrument all is provided with 2-3 cover ball righting mechanism in fluid cylinder, expand tube sealing subsidy part; The ball righting mechanism mainly is made of ball 5, catch 6, hold-down screw (a, b, c) 4,7,23.Its effect is to reduce instrument to go into the well frictional resistance, it is located at cylinder sleeve 3,8,10 respectively, ball is set upright on box cupling 17 and the pawl spring 19 part outer cylinder surfaces, its structure is to process 1 vertically on these several part outer cylinder surfaces, along circumferentially processing 4-6 rectangular channel, 1-3 of centre position processing in these rectangular channels, amount to 4-18 hemisphere nest, be used to place steel ball 5, place catch 6 on the ball, and also process ball-and-socket in the catch relevant position, catch is installed in the rectangular channel, and two ends tighten on outer cylinder surface with hold-down screw 4.The catch external diameter is identical with its part external diameter of installing, and mounted ball protrudes in part external surface 2-3mm, and ball and ball-and-socket be matched in clearance, is convenient to ball and rolls in ball-and-socket; During construction, first drifting, the scraping borehole wall, make borehole wall cleaning,, and avoid casing coupling and the serious part of casing deformation according to absorption well segment length, position calculation subsidy length of tube and subsidy position; Then with this instrument upper end with go into the well casing post and link to each other, and the instrument of transferring needs the well section of subsidizing to the horizontal well.Carrying out ground suppresses, hydraulic pressure is delivered in the annular space between piston and the cylinder sleeve by the aperture on the piston, and it is descending to promote cylinder sleeve, when suppressing to 3-5MPa, cylinder sleeve a goes up shear pin and cuts off, cylinder sleeve a, b, c is descending along the outside piston cylinder, promote adjustable ring and reach the upward crowded upward sealed tube that expands of expand tube downwards, simultaneously because the relation of active force and reaction force, piston is connecting central tube and lower contact has up trend, lower contact drives shearing ring, baffle ring, pawl spring reaches down, and expand tube upwards squeezes the lower seal pipe that expands, thereby the upper-lower seal pipe is tightly squeezed to expand on former casing wall, suppress to squeeze expanding and stop to suppress when motionless, the upper lifting pipe post, top connection drives piston, tube connector, central tube and lower contact are up, and shearing ring is cut off, the pawl spring lower end enters in the cannelure of lower contact external surface, and pawl spring lower end external diameter is retracted to can be from expand tube, the size of extracting out in sealed tube and the subsidy pipe.Continue the upper lifting pipe post, make cylinder sleeve and adjustable ring propose pit shaft together, expand tube, upper-lower seal pipe and subsidy pipe are up and down stayed formed the new well passage of going in the pit shaft in company with the central tube string.

Claims (2)

1. horizontal well sheath repairing tool is set upright box cupling (17), central tube (18), pawl spring (19), lower contact (20), baffle ring (21), shearing ring (22), hold-down screw c (23) by shear pin (1), top connection (2), cylinder sleeve a (3), hold-down screw a (4), ball (5), catch (6), hold-down screw b (7), cylinder sleeve b (8), piston (9), cylinder sleeve c (10), adjustable ring (11), expand tube (12), tube connector (13), sealed tube (14), subsidy pipe (15), box cupling (16), ball and is formed; It is characterized in that: a whole set of central tube string is by being threaded, whole exterior tube string can slide up and down along the central tube string, so that hydraulic coupling is passed to the expand tube place, this instrument shearing ring (22) bottom is threaded with lower contact (20), exterior tube was ganged up baffle ring (21) and was supported on the shearing ring (22), expand tube sealing subsidy part is mainly by expand tube (12), sealed tube (14), subsidy pipe (15), central tube (18), pawl spring (19), lower contact (20), baffle ring (21), shearing ring formations such as (22), wherein expand tube (12), sealed tube (14) is with respect to subsidy pipe (15), central tube (18) is symmetrical arranged up and down; Pawl spring (19) is a tubular structure, axially mills out 6 saturating grooves in its lower end, and pawl spring (19) lower end circumferentially is divided into 6 pawls, and the external diameter of pawl is greater than pawl spring upper end external diameter, and is identical with expand tube (12) external diameter; Be that expand tube provides support power down when the effect of pawl spring is to subsidize, promote the upwards crowded sealed tube (14) that expands of expand tube down; After being that also sealed tube (14) is sealed in internal surface of sleeve pipe, fluid cylinder continues the downward application of force, promoting baffle ring (21) cuts off shearing ring (22), pawl spring (19) is descending, after 6 pawls in its lower end go downwards to ring shaped slot in the lower contact (20), when on when carrying instrument, pawl spring (19) is stuck in this groove, under following expand tube effect, its reduced diameter, thus can trip out pit shaft smoothly.

2. a kind of horizontal well sheath repairing tool according to claim 1 is characterized in that: this instrument all is provided with 2-3 cover ball righting mechanism in fluid cylinder, expand tube sealing subsidy part; The ball righting mechanism is mainly by ball (5), catch (6), hold-down screw a, b, c (4), (7), (23) constitute, its effect is to reduce instrument to go into the well frictional resistance, it is located at cylinder sleeve (3) respectively, (8), (10), ball is set upright on box cupling (17) and pawl spring (19) the part outer cylinder surface, its structure is to process 1 vertically on these several part outer cylinder surfaces, along circumferentially processing 4-6 rectangular channel, 1-3 of centre position processing in these rectangular channels, amount to 4-18 hemisphere nest, be used to place steel ball (5), place catch (6) on the ball, and also process ball-and-socket in the catch relevant position, catch is installed in the rectangular channel, and two ends tighten on outer cylinder surface with hold-down screw (4).The catch external diameter is identical with its part external diameter of installing, and mounted ball protrudes in part external surface 2-3mm, and ball and ball-and-socket be matched in clearance, is convenient to ball and rolls in ball-and-socket.

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