Preparation of well drilling program
The drilling program by the engineering department of Pasargad Drilling and Reclamation Company based on the geological forecast, reservoir information, the location of the adjacent wells and also the history of the adjacent wells and the well itself, if any, taking into account the salt The related equipment will be provided and includes all engineering needs, equipments The need for drilling a well and the time schedule is an advanced risk analysis that can be used for the design of drilling engineering software.
1- Well route design
Using the initial information, the initial design of the well path is done by the experts of this company, and the type of the well path is designed from the point of view of vertical, horizontal or directional drilling in this part. The path of the well should be designed by reliable and up-to-date software. Route design should be done in a way that enables the achievement of drilling goals with the least amount of time, cost and drilling risk.
2- Examining the dangers of advanced drilling
Environmental and safety points in advanced operations
Surface gases
The shale and chert layers are problematic
Surface high pressure layers
Layers with abnormal pressures
Flowers of Fashan
Gas hydrates (offshore)
Conditions and agreements during drilling operations (clamping pipes, cutting pipes and...
There is a danger of colliding with the neighboring wells.
3- Presentation of well eruption control method
These methods are similar in dry and shallow drilling, but they are different in deep wells, and the proposed methods should be evaluated based on the geological and reservoir conditions and the history of the wells in each field, the possible scenarios of the well eruption The best and safest method In order to control the possible eruption and according to the valid standards of the oil industry (including API16) (ISO15) should be provided.
4- Wall and lining pipe design
For the design of this stage, information such as the location of the wall/lining pipes, the information of the complementary thread, the type of fluids and the corrosiveness of the fluid, the number and type of walls necessary to reach the final depth of the tea, Weight of cement and drilling fluid, pressure estimation Permeability and failure pressure of the builders is needed. The location of the wall heel and their number is determined based on the penetration pressure and failure pressure and geological considerations. Penetration pressure and failure pressure of the structures can be estimated by using information from the surrounding fields and also by using drilling software and calculation methods. In this stage, according to the forces on the wall pipes and the conditions governing the well, such as the presence of H2S gas, factors such as the type, weight per unit length, thread and related walls and liners are determined. Also, the design of the wall pipe can be done optimally by using wall pipes from the economic point of view. Computational methods or engineering software made excavations.
5- Drilling fluid design
The drilling fluid design is done by the drilling fluid experts considering the weight of the fluid proposed in each drilling phase, the specifications of the builders, the information of the surrounding fields and wells, and the predicted possible problems. By designing the drilling fluid, the type, weight, rheological properties, preparation formulation and the amount of materials required for each phase are determined.
6- Drill design and selection
After the completion of the wall design, the size of the drill and the hole of each drilling phase is determined, and then according to the geomechanical characteristics of the builders, by examining the surrounding wells and the drilling progress rate of the consumed drills in them and possible problems with them The type of drills is determined by the rate . Considering the anticipated progress and the amount of drilling area in each phase, the number of consumable drills will be determined.
7- Drilling string design
At this stage, the drilling line includes two sections of drilling stem and drilling pipes. This design is done according to the size of the hole, the drilling depth of each phase, the conditions, the shape of the well, the weight required to act on the drill, the forces on the drilling string and the capacity of the drilling rig. After designing the drilling line, which is done by two calculation methods or by using software.
8- Hydraulic design
One of the most important effective factors in the rate of drilling progress is the use of appropriate hydraulic parameters. At this stage, according to the characteristics of the drilling fluid, depth, drilling area, size of the wall pipes, length and size of the weight and drilling pipes, specifications of the motor and the directional drilling rod, with two calculation methods or hydraulic software The hole is designed. With this design, the amount of flow and pumping pressure of the drilling fluid and the number and size of the nozzles of each drill are determined.
9- Designing drilling parameters
After designing the drill, drilling string and hydraulics, the mechanical drilling parameters including the weight on the drill, the speed of the drill rotation, the pumping flow rate of the drilling fluid are determined to obtain the best drilling efficiency.
10- Cement design
The cementing design of wall and lining pipes is done considering the depth, the weight of the drilling fluid, the size of the wall pipe, the considered manufacturers, the temperature and the experiences obtained from the neighboring wells.
11- Compilation of well and reservoir evaluation programs
With well design (sampling) and geochemical geophysical test plan, and sampling, coring, synthesis, time, such things as number, depth, should be done in this stage of the oil engineering program Ded.
12- Well equipment design
Simultaneously with the design of wall pipes, the required well equipment for each phase including the type, size and working pressure of the equipment according to the temperature, pressure, way of completion of the well, reservoir fluid and other reservoir conditions based on the design standards It is identified.
13- Well completion and stimulation system design
According to the type of well (production, injection or observation), pressure and conditions of the reservoir, the corrosiveness of the reservoir fluid and the method of extraction, it is done according to the notification program from the well completion design engineering and experiencer. The planning of the well is done based on the conditions of the reservoir and the well.
14- Selecting the type of drilling machine
According to the location and characteristics of the well, the final depth and the aforementioned designs, the type and capacity of the drilling rig (land or sea) is determined.