Method for safe passage of box 7 brown mudstone section in sulige side tracking slim hole
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A tan, mudstone technology, used in drilling equipment and methods, directional drilling, drilling equipment, etc., can solve the problems of mudstone collapse and debris sinking and accumulation, and enhance wellbore stability, increase lubricity, and carry sand. performance, the effect of reducing the risk of downhole accidents
Active Publication Date: 2020-03-24
BC P INC CHINA NAT PETROLEUM CORP +1
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[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
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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] like Figure 4...
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Abstract
The invention provides a method for safe passage of a box 7 brown mudstone section in a sulige side tracking slim hole. The method is characterized by comprising the specific steps that firstly, the well deviation of the mudstone section is adjusted from 76 degrees-78 degrees to 68 degrees-70 degrees; secondly, a drilling tool combination and a screw rod are selected; thirdly, the mudstone sectionis drilled through by means of rotary disc and screw driving; fourthly, after drilling through, a drill bit is hoisted and replaced, the drilling tool combination with dual centralizers continues torun and enter the top of the box 7 brown mudstone section over 20m, a pump is started for circulation, drilling fluids first wash off a mud cake between the centralizers to keep runners of the dual centralizers unblocked, a drilling tool below the started pump is reamed off a complex mudstone section, the pump is stopped and the drill bit continues to go down; and fifthly, the drill bit enters a horizontal section, a short trip is performed every drilling for 150m-250m, a detritus bed is broken, and the displacement is increased when the drill bit goes down until the pump pressure is allowed.According to the method, the problems that the well wall collapses easily, detritus piles up, the friction resistance is high, and the blocking and clamping are serious are solved, and the high efficiency and safety of side tracking of well section mudstone with the slim hole and a large slope are improved.
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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