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A safe crossing method for Sulige sidetracking slim hole box 7 brown mudstone section

A tan and mudstone technology, applied in drilling equipment and methods, directional drilling, drilling equipment, etc., can solve problems such as mudstone collapse and debris sinking and accumulation, and achieve enhanced wellbore stability, increased lubricity and sand-carrying Performance, the effect of reducing the risk of downhole accidents

Active Publication Date: 2021-01-29
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the existing problems of mudstone collapse and debris subsidence and accumulation, the present invention provides a method for safely crossing the tan mudstone section of Sulige sidetracking slim hole box 7. The present invention changes the well deviation of the mudstone section from 76° to 78° ° Adjust to 68°-70° to improve the structural characteristics of the combined centralizer of the drilling tool, and solve the problems of mudstone collapse and cuttings accumulation from the two aspects of the well depth profile and the improvement of the structural characteristics of the drilling tool

Method used

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  • A safe crossing method for Sulige sidetracking slim hole box 7 brown mudstone section
  • A safe crossing method for Sulige sidetracking slim hole box 7 brown mudstone section
  • A safe crossing method for Sulige sidetracking slim hole box 7 brown mudstone section

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Embodiment 1

[0031] In order to overcome the problems of existing mudstone collapse and cuttings subsidence and accumulation, the present invention provides such as Figure 1-4 A Sulige sidetracking slim hole box 7 safe crossing method for the tan mudstone section is shown, the invention adjusts the well deviation of the mudstone section from 76°-78° to 68°-70°, and improves the combined righting of the drilling tool The structural characteristics of the drill can solve the problems of mudstone collapse and cuttings subsidence and accumulation from two aspects of the well depth profile and the improvement of the structural characteristics of the drilling tool.

[0032] A method for safely crossing the tan mudstone section of Sulige sidetracking slim hole box 7, characterized in that: the specific steps are:

[0033] Step 1: Adjust the well deviation of the mudstone section from 76°-78° to 68°-70°;

[0034] Step 2, select drill tool assembly and screw rod;

[0035] Step 3: Drill through t...

Embodiment 2

[0041] On the basis of Example 1, in this example, in the step 2, the selected drilling tool assembly is sequentially connected drill bit 1, single-curved screw 3, screw centralizer 2, drilling tool centralizer 4, and directional joint 5. Non-magnetic drill collar 6, slope weighted drill pipe 7 and drill pipe 8.

[0042] The drill bit 1 is a Φ118mm PDC drill bit, the single-curved screw 3 is a Φ95mm 1.25° single-curved screw, the directional joint 5 is a Φ105mm directional joint, the non-magnetic drill collar 6 is a Φ105mm non-magnetic drill collar, and the slope-weighted drill pipe 7 is Φ88.9mm Slope heavy drill pipe, drill pipe 8 is Φ 88.9mm drill pipe.

[0043] The drilling tool centralizer 4 is a structure of a straight-edged centralizer with a deep passageway. The outer diameter of the main body of the centralizer is 95mm, the maximum outer diameter of the centralizer is 114mm, the rib height of the centralizer is 15mm, and the rib width is 35mm.

[0044] Such as Figur...

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Abstract

The present invention provides a Sulige sidetracking slim hole box 7 brown mudstone section safety crossing method, characterized in that: the specific steps are: Step 1, adjusting the well deviation of the mudstone section from 76°-78° to 68°-70° °; Step 2, select the drilling tool assembly and screw; Step 3, use the rotary table and screw drive to drill through the mudstone section; Step 4, after drilling through, start drilling and change the drill bit, and then continue to run into the drilling tool with double centralizers The combination enters Box 7, 20m above the top of the tan mudstone section, and the pump is turned on for circulation. The drilling fluid first washes away the mud cake between the centralizers to keep the flow channels of the double centralizers unblocked. , stop the pump and continue drilling; step 5, enter the horizontal section, perform a short trip every 150-250m, break the cuttings bed, and increase the displacement when the pump pressure allows. The invention solves the problems of easy collapse of the well wall, accumulation of cuttings, large frictional resistance and serious jamming, and improves the efficiency and safety of the mudstone in the high-inclination well section of the sidetracking slim hole.

Description

technical field [0001] The invention relates to a method for safely crossing the tan mudstone section of Sulige sidetracking slim hole box 7. Background technique [0002] With the continuous development of oilfields, the number of low-yield and low-efficiency wells, long-term shut-in wells, and casing damaged wells in oil fields has increased year by year, which poses a great challenge to the sustained and stable production of oilfields. Large-scale old wells urgently need to be treated for production increase and resumption. The sidetracking technology of old wells is used to redevelop oil reservoirs, which has outstanding advantages such as prolonging the service life of old wells, restoring and improving the development well pattern, and improving recovery. It is an effective means to realize the production of remaining reserves. Compared with conventional infill development technology, sidetracking technology for old wells can not only save the cost of ground constructi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/08E21B17/10E21B21/00
CPCE21B7/06E21B17/10E21B21/00
Inventor 韦孝忠杜松涛韦海防陈财政祝敏荣赵恒李婧
Owner BC P INC CHINA NAT PETROLEUM CORP
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