CN105443062A - Method for preventing blockage through vibration in directional drilling process of horizontal well - Google Patents

Abstract

The invention relates to the technical field of drilling and completion of a horizontal well and an extended reach well, in particular to a method for preventing blockage through vibration in a directional drilling process of the horizontal well. The method comprises the steps of installing a group or a plurality of groups of vibration tools on the upper portion of a drill collar and drill pipe in a horizontal well kick-off assembly and installing an anti-blocking centering device on the upper portion of the vibration tools. The method reduces the occurrence probability of sticking and blocking accidents in the drilling process, the vibration tools can generate vibration under the effect of fluid power, the vibration can be effectively transferred to nearby drilling tools, and the static friction force between the drilling tools and a lower well wall can be transformed to kinetic friction force in the sliding drilling process. The problem that the drilling tools are statically located on the lower well wall for a long time, so that drilling accidents such as drill blockage occur is solved. The shortcomings that if the drilling tools are in a static state for a long time, the adhesive force caused by the drilling tools and the lower well wall is bigger and bigger, so that the drilling tools are hard to be lifted, and even the sticking and blocking accidents occur are overcome.

Description

A kind of anti-chucking method of vibration applied in horizontal well directional drilling process

Technical field:

The present invention relates to horizontal well, extended reach well bores completion technique field, particularly a kind of anti-chucking method of vibration applied in horizontal well directional drilling process.

Background technology:

In the drilling process of horizontal well and extended reach well, because of the difference of geological conditions, reservoir pressure coefficient, hole cleaning condition etc., often cause horizontal well, extended reach well construction later stage slipping drilling difficulty, drill string is at high angle hole section gravitate, be close to lower well, the long-time transfixion of drilling tool causes the generation of the accidents such as sticky card, causes the many complex situations in drilling process.Because of horizontal well and extended reach well well segment length, stuck point is dark, usually needs the measures such as bubble decoder, breakouting pack of dynamite, salvaging, cover milling, well filling, sidetracking, causes great economic loss and harmful effect.

Summary of the invention:

The technical problem to be solved in the present invention is to provide a kind of anti-chucking method of vibration applied in horizontal well directional drilling process, the method achieve and reduce sticky card accident odds in drilling process, vibratory tool can produce vibration under fluid power effect, this vibration can effectively pass to neighbouring drilling tool, and then kinetic force of friction can be converted in drilling tool slipping drilling process with the stiction of the lower borehole wall, avoid drilling tool long inactivity, at the lower borehole wall, the down-hole accidents such as bit freezing occur.Overcome the adhesive power that existing drilling tool causes because of long inactivity producing with the lower borehole wall increasing, cause lift difficulty, or even the deficiency of sticky card accident.

The technical solution used in the present invention is: a kind of anti-chucking method of vibration applied in horizontal well directional drilling process, the method step is as follows: in horizontal well kick-off assembly, one or more groups vibratory tool is installed on the top of drill collar and drilling rod, installs an anti-sticking centralizer on the top of vibratory tool simultaneously.

The invention has the beneficial effects as follows: the present invention reduces sticky card accident odds in drilling process, vibratory tool can produce vibration under fluid power effect, this vibration can effectively pass to neighbouring drilling tool, and then kinetic force of friction can be converted in drilling tool slipping drilling process with the stiction of the lower borehole wall, avoid drilling tool long inactivity, at the lower borehole wall, the down-hole accidents such as bit freezing occur.

Accompanying drawing illustrates:

Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.

Fig. 1 is the structural representation of horizontal well kick-off assembly.

Detailed description of the invention:

As shown in Figure 1, horizontal well kick-off assembly is made up of drill bit 1, power drilling tool 2, drill collar and drilling rod 3 and drilling tool 6, a kind of anti-chucking method of vibration applied in horizontal well directional drilling process, the method step is as follows: in horizontal well kick-off assembly, one or more groups vibratory tool 4 is installed on the top of drill collar and drilling rod 3, installs an anti-sticking centralizer 5 on the top of vibratory tool 4 simultaneously.

Be understandable that, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.

Claims (1)

1. one kind can apply to the anti-chucking method of vibration in horizontal well directional drilling process, it is characterized in that: the method step is as follows: one or more groups vibratory tool (4) is installed on the top of drill collar and drilling rod (3) in horizontal well kick-off assembly, on the top of vibratory tool (4), an anti-sticking centralizer (5) is installed simultaneously.