Casing make-up torque BTC
buttons are different and different< br />
2-3/8" Eue with standard weight of 4.7ppf and J55 grade are small, good and large, as follows
1310 / 1760 / 2190
unit, n · m
2-7 / 8 & quot; The J55 of 6.5ppf and eue were
1670 / 2230 / 2790
3-1 / 2 & quot respectively; The J55 of 9.2ppf nue button is
1500 / 2010 / 2510
Shanghai Guojin is making Baosteel l80-13cr oil casing
l80-13cr is a special oil casing of Baosteel, which is resistant to corrosion and CO2. The commonly used buckle type is Baosteel gbt1 BGC
the following figure shows the range of buckle torque, you can refer to the following:
The coring tools for scientific ultra deep wells are applied in the formation conditions of high temperature, high pressure and strong in-situ stress release, and driven by the bottom hole dynamic impact rotation, which should have the following conditions:
1) enough strength, stiffness and stability to ensure the safety under bad working conditions
(2) the reliable single action performance does not fail in the environment of high temperature, high pressure and high density drilling fluid in ultra deep wells, ensuring the core recovery rate and undisturbed property In order to minimize the cutting area of the drill bit under the same drilling diameter, the reasonable fit of the inner and outer diameters of the drill bit and the clearance between the inner and outer pipes should be madeonly point coring is used in oil and gas drilling, and the coring structure adopted has a large area of broken rock, which is not concive to efficient and continuous coring in long well section. KT type coring drill has the successful experience of 4638m coring in CCSD-1 well, and has been used in the changeable formation of SK-1 well (main hole), such as strong plastic mudstone, weak Cemented Sandstone and tight shale, and the extremely fractured formation of wfsd-2 and wfsd-3. It has the function of coring in the conditions of ultra deep hole high temperature, high confining pressure, strong ground stress release and deep hole changeable complex formation
Fig. 2.1 structure of KZ single acting double pipe drilling tool
the structure of KT single acting double pipe drilling tool shown in Fig. 2.1 is 13000m scientific ultra deep well coring tool, and its structural features are as follows:
1) single acting mechanism is composed of upper and lower high-strength thrust ball bearings, bearing cavity and mandrel. The bearing cavity is a part of the outer assembly, which provides space for high strength and large bearing; The design of full pump open forced lubrication without sealing rubber parts and micro circulation cleaning inside the bearing cavity make the drilling tool not affected by high temperature, high pressure and high density drilling fluid
At the same time, the clearance between the inner step of the drill bit and the spring seat can be adjusted by the thread of the spindle and the inner pipe joint During normal coring, the drilling fluid flows to the annular gap between the inner and outer pipes through the side flow channel of the spindle and the water hole in the bearing cavity. With the continuous entry of the core, the pressure of the inner pipe rises, which prevents the core from entering the pipe, that is, the automatic pressure relief of the steel ball of the check valve is opened to balance the inner and outer pressure of the pipe2.1.1 specification design and pipe selection
2.1.1.1 coring drilling technical scheme
13000m scientific ultra deep well, two kinds of casing proceres and drilling construction proceres are proposed: one is to adopt advanced hole open hole drilling method, the other is to adopt equal diameter drilling method. Both proceres are adopted Φ 250mm (≠ 7500m well section) Φ 215.9mm (> 7500m section) two specifications of bit for point coring operation
. Three scientific projects have been formed, which are the scientific exploration wells core drilling caliber. Φ 150-156mm, core diameter Φ 95mm. This is not only because the diameter of the borehole is desirable Φ The core diameter of 95mm can meet the requirements of geological research Φ The diameter of 152mm well is similar, which can be directly applied to the mature wellhead and downhole tools in oil drilling. At the same time, it has good technical economy. In recent years, the slim hole and micro hole drilling technology with high efficiency, low cost and environmental protection has developed rapidly, which has become an important development direction of oil and gas drilling engineering Φ The successful coring of 149mm diameter at 8408m fully proves that Φ The diameter of 150-156mm can be used for ultra deep hole coring. Therefore, it is possible to Φ As an alternative, 150-156mm diameter coring tools can be used for continuous coring operation in long sections with difficult drilling, which can save the time and economic cost of coring drilling
the open hole drilling method of advanced hole is in 9500 ~ 11500m well section, and the equal diameter drilling method is in 7500 ~ 11500m well section, and the designed overall drilling bit diameter is 0 Φ 269.9mm The ultra deep well section is designed for the high hardness crystalline rock formation. Even for the full drilling and reaming drilling, the turbine motor driven impregnated diamond is the first choice. Therefore, it can also be used in the ultra deep well section Φ The 269.9mm diameter coring tool is used as an alternative for comparison. The coring scheme design of 13000m scientific ultra deep well is shown in Table 2.1 and table 2.2
Table 2.1 coring drilling technical scheme (advance hole open hole drilling method)
Table 2.2 coring drilling technical scheme (equal diameter drilling method)
2.1.1.2 specification design and pipe selection
design four specifications of coring tools (Table 2.3). Except for kt140 drilling tool inner pipe using geological pipe, other drilling tool inner and outer pipe using API standard oil casing
Table 2.3 coring tool specification design
2.1.2 BHA
2.1.2.1 advance hole open hole drilling method
(1) 0 ~ 7500m (one to four opening)
preferred: 250mm coring bit + 178mm hydraulic hammer + 172mm screw motor (172mm turbine motor) + 248mm centralizer + 178mm drill collar + 127mm drill pipe
Alternative 1 and 2: 152mm coring bit + 127mm hydraulic hammer + 120mm screw motor (127mm turbine motor) + 151mm centralizer + 121mm drill collar + 89mm drill pipe + 127mm drill pipe(2) 7500-9500m (five opening)
the first choice is 216mm coring bit + 172mm turbine motor + 214mm centralizer + 178mm drill collar + 127mm drill pipe
Alternative 1 and 2: 152mm coring bit + 127mm hydraulic hammer + 127mm turbine motor + 151mm centralizer + 121mm drill collar + 89mm drill pipe + 127mm drill pipe(3) 9500-11500m (six opening)
preferred: 216mm coring bit + 172mm turbine motor + 214mm centralizer + 178mm drill collar + 127mm drill pipe
Alternative 1: 152mm coring bit + 127mm hydraulic hammer + 127mm turbine motor + 151mm centralizer + 121mm drill collar + 89mm drill pipe + 127mm drill pipe Alternative 2: 270mm coring bit + 195mm turbine motor + 267mm centralizer + 203mm drill collar + 178mm drill collar + 127mm drill pipe (4) 11500-13000m (seven opening)216mm coring bit + 172mm turbine motor + 214mm centralizer + 178mm drill collar + 127mm drill pipe
2.1.2.2 equal diameter drilling method
except for option 2 of the fifth spud, the rest are the same as coring BHA of advanced open hole drilling method
7500-9500m (fifth opening) alternative 2: 270mm coring bit + 195mm turbine motor + 267mm centralizer + 203mm drill collar + 178mm drill collar + 127mm drill pipe
2.1.3 thread design of external assembly
2.1.3.1 tooth type selection
scientific ultra deep well coring tool is located at the bottom of the drill string, and high speed rotary (percussive) drilling by screw (or turbine) motor (+ hydraulic hammer) is the weakest link of the whole drill string. The thread design of the outer assembly is limited by the structure of the drilling tool, and the outer thread is the weakest part of the large diameter drilling tool. Therefore, the strength of the outer thread determines the strength of the coring drilling tool and limits the drilling parameters of the whole coring drilling
In CCSD-1 well,kt140 has adopted large pitch and high strength trapezoidal thread without taper, which has achieved good results and has been applied in SK-1 well (main well) and WFSD project. It is characterized by 8 mm pitch, 2 mm tooth height and 5 ° The bevel angle of the tooth profile can keep the high strength of the thread and give consideration to the tightness of the thread; The outer end face is 15 ° The sealing angle can further enhance the sealing performance of thread. In recent years, with the increase of coring depth in oil and gas drilling, the external assembly thread of coring tool is also being improved. For example, the newly developed chuan7-5 coring tool changes its external assembly thread from traditional triangular thread to trapezoidal thread. Therefore, the trapezoidal thread profile shown in Fig. 2.2 can be used for scientific ultra deep well outer pipe
Fig. 2.2 structure diagram of high strength thread
2.1.3.2 torsion test
in order to verify the torsion strength of the selected tooth type, the same thread type with pitch of 6 mm and tooth height of 1.2 mm was tested in Wuxi Drilling Construction Machinery Co., Ltd. The designed thread making torque is 8-10kn · m, and the maximum safety torque is 12kn · M. On the company's torque test bench, the screw thread is loaded step by step after pre loading torque of 4.6kn · M. when it is added to 12.7kn · m, there is no displacement or abnormality of male and female screw thread, and when it is 13.3kn · m, there is slight linear displacement (circumferential 6mm, outer diameter of specimen) Φ When the load is increased from 16kn · m to 17kn · m, there is a large displacement at the buckle end, as shown in Fig. 2.3 (b). If 40Cr material is selected for the blank of the test piece, and hrc30-32 is quenched and tempered, if q125 and P110 steel grades are selected for the regular design of drilling tools, the anti extrusion ability of the end face of the joint will be further improved, and the torsional strength of the thread will also be increased. Moreover, the designed four kinds of drilling tools will adopt 8 mm and 12 mm pitch, 2 mm and 3 mm thread height respectively. Therefore, the selected thread profile can fully meet the torsional requirements of drilling tools
Fig. 2.3 test experiment
2.1.3.3 enhancement and optimization of thread pair. From the analysis and application of drilling tool structure, the connecting thread between outer pipe and bearing cavity is easy to expand, stick, not easy to break and root broken. The connection thread pairs between the upper end of the outer pipe and the bearing cavity, and between the bearing cavity and the upper joint of the ultra deep coring tool are strengthened and improved as follows (Fig. 2.4): the pier at the upper end of the outer pipe is thick to form an inner thickened end; Stress groove is designed at the root of thread; The taper of thread is 1 ∶ 5 ～ 1 ∶ 10; The pitch of kt194, kt219 and kt245 drilling tools is 12mm and the tooth height is 3mm. The thread pair enhances the strength of the internal thread of the outer pipe, enhances the sealing performance in high temperature and high pressure environment, and greatly reces the stress concentration at the root
Fig. 2.4 schematic diagram of reinforced thread pair
the drill bit and reamer are at the bottom end of the drill string, the working state is relatively stable, the torque and bending moment are not easy to be concentrated here, and the inner thickening form can not be adopted at the lower end of the outer pipe e to structural constraints. Therefore, the drill bit and reamer, the reamer and the lower end of the outer pipe thread pair are still without taper and thickening thread, Set the root stress groove
2.1.4 the total efficiency of coring drilling in scientific ultra deep wells is determined by three factors, i.e., ROP, ROP and return length. The lifting and tripping speed has been determined when the construction equipment is selected; The drillability level of formation restricts the improvement of ROP to a great extent. By improving the cutting mode and structure of bit, using appropriate driving mode and drilling parameters, ROP can be improved in a certain range; Increasing the footage is a technical means to increase the efficiency of ultra deep hole coring drilling, and with the increase of hole depth, this advantage will increase
In CCSD-1 well of China, a 9 m coring tool has been developed and successfully used. This length, combined with the self-developed screw drill + hydraulic hammer two in one bottom hole power driven diamond hard rock coring technology, has successfully drilled 5180 m in crystalline rock formation. In order to further improve the drilling efficiency of coring at a depth of 5000m, it is proposed to use the core tube docking method to improve the return length and realize the medium and long drilling range coring drilling. The scheme is as follows:the middle centralizer which can be internally and externally straightened as shown in design figure 2.5 is connected with the upper and lower outer tubes; The upper and lower inner pipes are connected by a connecting clip spring seat with a clip spring; The middle centralizer is misplaced with the connecting snap ring seat (as shown in Fig. 2.6, the middle centralizer is on the top), so as to facilitate the orifice operation
Fig. 2.5 middle centralizer
Fig. 2.6 inner and outer centralizer coordination relationship
2.1.4.2 assembly and well entry
1. Check the last diamond bit for damage of bit body, tooth drop, etc., and make sure that the bottom hole is clean and free of falling objects
2. Handle the diamond bit carefully and place it on the rubber pad or wooden board. It is forbidden to place the diamond bit directly on the iron plate
3. Check whether the cutting teeth of the diamond bit are damaged, whether there are foreign matters in the diamond bit, whether there are O-rings in the nozzle hole, and install the nozzle as required< 1. Clean the male or female thread of the diamond bit and apply thread oil
2. Clamp the shackle on the diamond bit, put down the drill string and make it contact with the male or female buckle to make up
3. Put the diamond bit and the shackle together into the turntable bushing, and then tighten the screw according to the recommended make-up torque value< 3. Running in
1. Lower the diamond bit slowly, especially through the rotary table, blowout preventer and casing hanger, so as to protect the cutting teeth
2. Pay attention to the blocked section ring the last trip out, and make the bit pass slowly in case of necking and dogleg ring the trip in
3. When a single pipe is about one from the bottom of the well, start to rotate at a ROP of 50 ~ 60rpm and start a pump with a rated displacement to flush the bottom of the well
4. Observe the weight indicator and torque to make the diamond bit contact the bottom hole smoothly< 4. Diamond bit reaming
1. It is not recommended to use diamond bit for hole section reaming
2. If it is necessary to ream, the rated displacement and low torque should be used.