CN103939049A - A shaft anti-falling object device - Google Patents

Abstract

The invention discloses a shaft falling object prevention device which is arranged in a casing in a shaft, and comprises: the releasing joint, the short pipe joint, the at least one group of sealing rubber cylinders and the slips are sequentially connected from top to bottom, during operation, the lowering tool is connected with the releasing joint, the lowering tool lowers the shaft anti-falling device to the underground, the at least one group of sealing rubber cylinders and the slips are all anchored with the casing pipe through pressing, and the releasing joint is separated from the short pipe joint. The invention provides a shaft falling object preventing device arranged in a shaft, which is firmly fixed with a sleeve by arranging a double structure of a slip and a sealing rubber cylinder and anchoring the slip and the sleeve, so that the shaft falling object preventing device can bear larger impact force, prevent an oil pipe and various downhole tools which fall off from the upper part from falling and smashing into a downhole horizontal section, avoid causing downhole accidents, and control the production operation cost.

Description

A shaft anti-falling object device

technical field

The invention relates to the field of oil exploitation, in particular to a wellbore anti-falling object device.

Background technique

With the continuous development of oilfields, the use of horizontal wells to efficiently develop thin oil layers has gradually been widely used. In the production process of oilfields, tubing breaks and various downhole tools in Such downhole tools fall into the horizontal section of the downhole, or even fall to the bottom of the artificial well, which will inevitably cause downhole accidents, and the process of salvaging the fallen tubing and downhole tools is complicated and difficult, which delays the production process and increases operating costs. The development effect of horizontal wells is greatly affected.

At present, the length of the horizontal section of a horizontal well is generally 200-1000m. Preventing some tubing and various downhole tools from falling into the horizontal section and causing accidents is an important problem that needs to be solved.

Contents of the invention

In order to solve the problem of oil pipes and various downhole tools falling into the horizontal section in the prior art, an embodiment of the present invention provides a wellbore falling object prevention device. Described technical scheme is as follows:

A wellbore anti-falling object device, which is arranged in the casing inside the wellbore, and the wellbore anti-falling object device includes: a hand-drop joint, a short pipe joint, at least one set of sealant rubber cartridges and slips, the hand-throw The joint, the short pipe joint, the at least one set of sealant cartridges and the slips are sequentially connected from top to bottom. When working, the lowering tool is connected with the drop-off joint, and the lowering tool connects the wellbore The falling object prevention device is lowered downhole, and the at least one set of sealing rubber cartridges and the slips are anchored to the casing by pressing, and the hands-free joint is separated from the short pipe joint.

Further, the slips are up and down bidirectional slips.

Specifically, preferably, the wellbore anti-falling object device further includes a buffer rubber sleeve, the buffer rubber sleeve is arranged between the short pipe joint and the at least one set of sealing rubber sleeves, and the buffer rubber sleeve is used for Dampens forces from the stub fitting.

Further, at least one set of buffer rubber cylinders is provided.

Preferably, both the short pipe joint and the slips are made of alloy steel.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

The embodiment of the present invention provides a wellbore anti-falling object device which is arranged inside the wellbore. By setting the dual structure of the slips and the sealant cylinder and anchoring the casing, the invention is firmly fixed with the casing, so that the The present invention can withstand a relatively large impact force, thereby preventing the oil pipes and various downhole tools falling off from above and smashing into the downhole horizontal section, avoiding downhole accidents, controlling the cost of production operations, and making the development of horizontal wells go smoothly; in addition, The invention has simple structure, convenient operation and good application value.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural view of a wellbore falling object prevention device provided by an embodiment of the present invention.

Among them: 1 drop-off joint, 2 short pipe joint, 3 buffer rubber tube, 4 sealing rubber tube, 5 slips.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a wellbore anti-falling object device is arranged in the casing in the wellbore, and the wellbore anti-falling object device includes: a hand-off joint 1, a short pipe joint 2, and at least one set of sealing rubber cartridges 4 and slips 5, the hands-free joint 1, the short pipe joint 2, the at least one set of sealant rubber cartridges 4 and the slips 5 are connected sequentially from top to bottom. When working, the lowering tool and the The drop-off joint 1 is connected, the lowering tool lowers the wellbore anti-falling object device downhole, and the at least one set of sealing rubber cartridges 4 and the slips 5 are all anchored to the casing by pressing, And the hands-free joint 1 is separated from the short pipe joint 2 .

Among them, the hands-off joint 1 is the prior art, and is mainly used for cooperating with the lowering tool to make the present invention go down well downhole smoothly, and to make the parts below the hands-off joint 1 of the present invention be fixed in a suitable position underground; 2 is mainly used to withstand the huge impact force of the falling objects in the wellbore, and dock with the fishing tool after the work is completed so that the present invention can be salvaged smoothly; when working, the drop-off joint 1 is docked with the lowering tool, and the lowering tool is generally a working oil pipe. Lower it to a suitable position in the well, throw a ball into the present invention through the ground and press it, so that the slips 5 are opened and anchored on the casing, and at the same time, the sealing rubber sleeve 4 is expanded and anchored on the casing under pressure, and the sealing rubber sleeve 4 is also According to actual needs, one or more groups can be set up to supplement the anchoring force between the present invention and the bushing. The anchoring is completed and locked, so that the present invention is firmly fixed inside the bushing, and the pressure is continued to make the hand-free joint 1 Complete the action of throwing away, that is, the throwing-off joint 1 is separated from the short pipe joint 2, and then the throwing-off joint 1 is lifted out with the working tubing, the short pipe joint 2 and its lower parts are left in the well together, and the oil pipes and other falling objects in the well fall To the short pipe joint 2, it is intercepted by the present invention; after the work is completed, the fishing tool is lowered to dock with the short pipe joint 2, and the present invention is salvaged.

The embodiment of the present invention provides a wellbore anti-falling object device that is installed inside the wellbore. By setting the dual structure of the slip 5 and the sealant rubber tube 4 and anchoring the casing, the invention is firmly fixed with the casing. Thereby the present invention can withstand greater impact force, and the sealant rubber tube 4 can prevent the slips 5 from being buried by sand at the same time, thereby preventing the falling oil pipe and various downhole tools from falling into the downhole horizontal section and avoiding downhole accidents. Control the cost of production operations, so that the development of horizontal wells can be carried out smoothly; in addition, the present invention integrates the drop-off joint 1 that is convenient for lowering, the short pipe joint 2 that is convenient for fishing, the slip 5 that is convenient for anchoring, and the sealing rubber tube 4. , the overall structure is simple, the operation is convenient, and it has good application value.

As shown in FIG. 1 , further, the slips 5 are bidirectional slips 5 up and down. The two-way slips 5 can anchor the present invention in the casing more stably, which is beneficial to intercepting falling objects.

As shown in Fig. 1, specifically, as a preference, the wellbore anti-falling object device further includes a buffer rubber sleeve 3, and the buffer rubber sleeve 3 is arranged between the short pipe joint 2 and the at least one set of sealing rubber sleeves 4 Between, the buffer rubber tube 3 is used to buffer the force from the short pipe joint 2 .

Further, at least one set of buffer rubber cylinders 3 is provided.

As shown in FIG. 1 , as a preference, both the short pipe joint 2 and the slips 5 are made of alloy steel. The short pipe joint 2 is heat-treated with high-quality alloy steel, which improves the collapse strength, and the slip 5 is made of alloy steel, which has high hardness and good impact resistance.

Wherein, when working, the present invention is anchored at a suitable position in the casing, and falling objects such as oil pipes in the well fall onto the short pipe joint 2, and the impact of the falling objects makes the short pipe joint 2 fall and apply force downward, and the buffer rubber tube The function of 3 is to buffer the impact force during the pressing process of the short pipe joint 2, so that the anchoring between the sealant rubber cylinder 4 and the casing, the slips 5 and the casing is affected as little as possible, and then the present invention It can be more stably anchored in the casing, which is beneficial to the interception of falling objects. The buffer rubber tubes 3 can be arranged in one or more groups according to actual needs.

After testing, in the case of no liquid surface in the wellbore, the present invention can withstand the impact force generated by the oil pipe with a maximum length of 1000m and a drop distance of 500m. According to theoretical calculations, the instantaneous impact force of the oil pipe on the present invention is up to 102t. The seat seal of the present invention is intact and there is no Displacement changes play a very good role in preventing falling objects, which can effectively prevent large falling objects from entering the horizontal section of the horizontal well and cause fishing difficulties, provide technical guarantee for the normal production of horizontal wells, increase the safety factor, and control The production cost has a good market prospect.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (5)

1. A wellbore anti-falling object device, which is arranged in the casing in the wellbore, is characterized in that the wellbore anti-falling object device comprises: a hand-off joint, a short pipe joint, at least one group of sealant rubber cartridges and slips, The hands-off joint, the short pipe joint, the at least one set of sealant cartridges, and the slips are sequentially connected from top to bottom. During work, the lowering tool is connected to the hands-free joint, and the lowering tool Lowering the wellbore falling object prevention device downhole, anchoring the at least one set of sealing rubber cartridges and the slips to the casing by pressing down, and separating the hands-free joint from the short pipe joint . 2 . The wellbore falling object prevention device according to claim 1 , wherein the slips are bidirectional slips up and down. 3 . 3. The shaft anti-falling object device according to claim 1 or 2, characterized in that, the well shaft anti-falling object device further comprises a buffer rubber sleeve, and the buffer rubber sleeve is arranged between the short pipe joint and the at least Between a group of sealing rubber cylinders, the buffer rubber cylinder is used to buffer the force from the short pipe joint. 4. The shaft anti-falling object device according to claim 3, characterized in that at least one set of buffer rubber tubes is provided. 5. The shaft anti-falling object device according to claim 4, characterized in that, both the short pipe joint and the slips are made of alloy steel.