Abstract:The data quality in deep geological drilling process is poor， and traditional methods are hard to effectively remove all kinds of data noise such as spikes and burrs. A streaming big data analysis and dynamic pre-processing method for deep geological drilling process was proposed and successfully applied to the 3000m scientific drilling project in Dandong， Liaoning province. Firstly， the process mechanism and requirements of data processing are deeply analyzed， and the framework of streaming big data analysis and dynamic pre-processing in deep geological drilling process is established. After that， the outliers in the process data are removed by limiting filtering combined with the distribution characteristics of the process data and the driller’s manual operation experience. Then， the moving window strategy is introduced to dynamically process the big data of convective drilling， and savitzky Golay filter is used in each window to further improve the data quality. Finally， results of simulations and engineering application show that the proposed method has good engineering applicability and effectiveness.

Abstract:In the world now competition for oil and gas resources is getting intense day by day. Their production speed is increased quickly， and expenses for drilling and production of oil and gas are sharply raised. In order to resolve above-mentioned problems， it is necessary to develop and use innovation technology. In Russia， the intellectual well， and the drilling and production technology have been developed with good technical and economic results obtained. The innovation technology is not only a combination of instruments and sensors of the automatic production control system or transportation means of oil products， but also is a technical method. Use of the method can guarantee the maximum of commercial benefit and production safety， cut down the number of oil production wells， reduce expenses for ground equipment， reduce expenses for elimination of well intervention， and increase oil production speed and volume. This is a successful innovation technology， proven by practice； therefore， it has some reference value for us.

Abstract:The deviation correction method needs to be verified by experiments repeatedly before it can be applied to practical projects. It will take much time and money to conduct field testing before the development of algorithm has been completed. So it is very necessary to develop the engineering realization method of deviation correction control . In this paper， with the realization of deviation correction control in geological drilling as the research subject， the description of the actual correction process and the objectives of correction control are given. The problems with the model predictive control are summarized， and the correction control methods under different correction conditions are described based on the author’s early theoretical research. A directional drilling correction control system is developed to integrate the correction control algorithm. Finally， experiments are designed to verify the engineering applicability of the correction control algorithm. The experimental results show that the proposed control method can be effectively applied to the actual correction process， and can solve various correction tasks.

Abstract:Multi-object optimization of drilling trajectory is one of the keys to achieve efficient and safe drilling. The improvement of the optimization algorithms can get smaller trajectory length and less complexity in finding solutions to the trajectory optimization questions. However， the practicability of the trajectory optimization algorithm has not been verified. In this paper， the multi-object decomposition evolutionary algorithm combined with the adaptive penalty function， and the comprehensive evaluation method based on minimum fuzzy entropy are used to study the 3D sidetracking well trajectory optimization problem. The proposed methods were verified for their practicability with application in the drilling process intelligent control experimental system. They can provide reference and guidance for trajectory design in engineering practice， and provide reference for drilling trajectory tracking control.

Abstract:ROP prediction is an important part of drilling optimization， machine learning algorithms are currently an important means to achieve accurate ROP prediction， and correct feature selection is the key way to ensure machine learning accuracy. Based on the actual drilling data of a well in the South China Sea， this research uses a fusion feature selection method to select 10 drilling characteristic parameters， including well diameter， outlet temperature， inlet density，outlet density， K value， plastic viscosity， filtration loss， overburden pressure， pore pressure， and nozzle equivalent diameter. The optimized parameters are taken as model inputs， and the integrated Gradient Boosting Decision Tree （GBDT） algorithm is introduced to establish a ROP prediction model. The established model is compared with the conventional machine learning algorithm model， and the test results show that the accuracy of the proposed fusion feature selection algorithm model is 2% higher than that of the full feature model， and the average accuracy is 14.5% higher than that of the commonly used machine learning model. The research provides an effective solution for the accurate and rapid optimization of drilling parameters， and have guiding significance and practical application value for improving the drilling rate.

Abstract:Regional well-site data monitoring is of great significance to the control and decision-making of the geological drilling process. To solve the problems of sing well-site data， poor data interconnection， and lack of remote portable monitoring software in most current condition monitoring systems for the geological drilling process， a condition monitoring App based on Android for geological drilling process has been developed in combination with mobile communication and Internet technology. The App is designed with Model-View-Presenter architecture as a whole and has a series of functions such as real-time monitoring， historical curve trend analysis， and so on. It has been used on a geological drilling site and achieved good condition monitoring effect. The App can obtain the real-time status information of the drilling process and timely remind experts to make operation adjustments and decision-making， which provides great convenience for geological drilling.

Abstract:In view of the demand for mud performance maintenance and solid control processing equipment automation in solid mineral exploration drilling， research on the small integrated mud non-landing system that has the cyclic treatment process and the development of control equipment have been carried out. The equipment is mainly composed of the transition system， the purification system， the control system and the circulation pipe sink. In order to realize the reflexive control and remote visual control of the transition pump， PID control and internet of things technology are incorporated into the system. Field trial uses show that the operation of the equipment is safe， reliable and stable； the system has high purification efficiency and high degree of automation； what’s more， good results have been achieved in the aspects of technical cost and environmental protection， meeting the requirements of green exploration. The use of automatic intelligent control technology which reduces the site operation personnel and their labor intensity has improved the automation and intelligence of core drilling equipment to some extent， and provides technical support to achieve the goal of core drilling equipment automation and intelligence.

Abstract:The impactor is one of the important tools for preventing core blockage and improving exploration drilling efficiency of drilling. The non-destructive and accurate detection of impact energy has been a difficult issue for impactor manufacturers and research institutions. In this study， the impactor impact waveform is successfully converted to the voltage waveform signal by employing the piezoelectric force sensor and the charge amplifier. After that， the signal will be collected and interpreted again by PC through the MP4221 acquisition system and the real-time acquisition and display software based on Visual C++. According to the theorems of momentum and impulse， the specific relationship between impact energy of the impactor and the maximum impact force is built： the impact energy is proportional to the square of the maximum impact force. Besides， the corresponding feasibility is verified by the calibration experiment bench. The experiment shows that the impact force waveform can be accurately detected by using the piezoelectric sensor， and the corresponding impact power waveform can be accurately calculated by the relationship coefficient calibrated by the calibration bench.between impact energy and impact force.

Abstract:The low-solid drilling fluid is one of the most suitable drilling fluids for wireline core drilling； however， its poor anti-collapse and borehole cleaning capabilities hinder the application of wireline coring drilling in complex formations. The effects of nano-iron tetroxide， nano-boron nitride， nano-titanium dioxide， multi-wall carbon nanotubes and nano-silica on the rheological properties and filtration properties of low-solid drilling fluids were analyzed through experimental research. The results showed that： nano-iron tetroxide， multi-walled carbon nanotubes and nano-boron nitride had obvious effects on the performance of low-solid drilling fluids； furthermore， they can increase the viscosity and improve shear force. Then， the influence of the combination of the above three nanomaterials on the performance of the low-solid drilling fluid was analyzed by orthogonal experiments to obtain the optimized formulation of the composite nano-low-solid drilling fluid system with excellent performance： 3% sodium bentonite + 0.5% CMC-HV + 0.3% nano ferric oxide + 0.9% nanoboron nitride + 0.9% multi-walled carbon nanotubes. Finally， the mechanism of nanomaterials to improve the performance of low-solid drilling fluids is analyzed.

Abstract:In order to improve the performance of the wire-line coring hydro-hammer in complex formation and to improve the ability of solid-free drilling fluid to maintain the stability of hole walls， the PVA1788 flushing fluid treatment agent was added to tje PHP + GSP solid-free drilling fluid system. When the ratio of PHP， GSP and PVA1788 was 1∶5∶5 and the dosage of mixed powder was 1% to 1.5%， the solid-free drilling fluid performance was as below， APl water loss 10 to 11mL， funnel viscosity 18.4 to 21s， plastic viscosity 3.5 to 6mPa.s， yield stress 0.5 to 0.75Pa. Test and field application showed that the PVA1788 solid-free drilling fluid system had the characteristics of low viscosity， strong inhibition and anti-sloughing ability， good lubrication performance， and convenient operation and maintenance etc.； thus greatly improving the service life of hydro-hammer parts， increasing the drilling capability of drilling rig， and meeting the needs of maintaining stability of hole walls and safe drilling in complex formations. This paper has reference value for the popularization and application of the solid-free drilling fluid in similar formations.

Abstract:With high-pressure jet grouting plugging technology for complex formations， a jet grouting tool with special nozzles is designed to drill through complex formations， especially multi-layer complex formations and deep complex formations where drilling mud fails to protect hole walls. The drilling tool is lowered to the complex hole section， and cement slurry is hydraulically injected by the mud pump， and sent out continuously through the tool at high pressure to cut the hole wall at the collapsed section where broken rock and soil from the unstable hole wall is mixed cement slurry. After waiting for setting， a columnar cement-rock-soil mixture with irregular diameter is formed at the collapsed hole section. After re-drilling， a “cement casing” with some strength is formed to achieve wall protection at the same diameter. The design， cement slurry formula， process principle， technical points， operation essentials and field application effects of the technology are introduced in detail.

Abstract:Complex formation， unconsolidated， chloritized， water sensitive， was encountered when drilling in a gold mineral area in Song county， leading to complex conditions in the drilling process， including borehole shrinkage， collapse， leakage， water outburst， broken drill pipes， sticking， burnt drill tools， so and so forth. In correlation with the drilling experience in adjacent mining areas， this paper presents the drilling difficulties in this area， and analyzes the effect of different kinds of mud， including dispersed mud， solid-free polyvinyl alcohol mud， and low-solid polymer mud. The results show that， （1） High-concentration bentonite slurry has multiple functions such as anti-collapse， anti-leakage， and cementing loose rocks. It is simple to prepare and easy to use， and can be used for drilling in overburden. （2） The dispersed mud cannot meet the demand of the complex strata because of poor inhibition； the solid-free polyvinyl alcohol mud has high anti-caving capacities in the early drilling stage， but insufficient ability to deal with collapse. （3） Field applications of the low-solid polymer mud show that it can provides high inhibitive， good rheology and strong prevention of collapse.

Abstract:The Erxiadiji lead-zinc mining area in Sichuan is located at the combination of the northern segment of the north-south Ganluo-Xiaojiang fault （called the Malaha fault in this area） and the Malaha anticline. The regional geological conditions are complex， with broken rock formations and developed fissures， and there are drilling problems such as borehole collapse， leakage， diameter reduction， and falling stones. In order to avoid downhole incidents， shorten the drilling period and reduce operation risks， research work on drilling technology has been carried out in the mining area. Taking drilling problems in ZK4522， ZK4737， ZK7545 holes as examples， the causes for frequent drilling incidents are analyzed， improvement measures are put forward， and the drilling structure design suitable for the mining area is summarized. The formulation of flushing fluid used for different strata is expounded， and technical control measures are proposed for cement slurry wall protection and casing wall protection with good results achieved in the mining area. A set of drilling plans have been developed with practical reference value， which provides technical support measures and experience for future drilling in the mining area， and also some reference for other similar drilling works.

Abstract:In the past two years， scores of CBM parameter wells with a depth of 1500m were drilled in the periphery of Yuka Coalfield， Dachaidan， Qinghai province， and wire line core drilling was conducted as per the geological design requirements. Drilling results showed that there were many down hole accidents with long drilling periods and low borehole completion rates. This paper analyzes the problems with drilling of JLSZK2 borehole， including diameter enlargement， hole wall clearance， excessive core wear； in addition， with regard to the problems with other borehole drilling in the mining area，experiences are summarized on how to perform wire line coring with high efficiency and high-quality in continental sedimentary formation.

Abstract:In recent years， drilling depth in the sandstone-type uranium mine in Xinjiang Yili Basin is mostly between 600m and 1000m with measured average bottom hole deviation about 28m， and borehole deviation control is the main technical problem affecting the quality of drilling holes in the Yili mining area. Exploration drilling is mostly done by conventional core drilling in Yili Basin， where borehole expansion caused by complex formations is common. Low rigidity of the drill pipes and the large swinging bending range of the drill pipe due to its rotation in the hole are the main factors that cause the difficulty in controlling deep hole deviation in the sandstone-type uranium mine in Yili Basin. Large deviation in medium and deep holes affects the quality of geological results and drilling economic benefits. With proper design of the centralizer suitable for the complex formation in Yili Basin， and optimization of the drilling string combination， the average deviation in the deep holes drilled in sandstone-type uranium mines in the Yili Basin test area has been greatly reduced. The deviation prevention and control measures can provide some reference for similar drilling works.

Abstract:Since bedrock water well fracturing technology was developed， it has achieved good stimulation effect， but there are still some problems such as poor adaptability and uncertainty in stimulation performance. Based on the analysis results of the factors influencing the fluid flow pattern and the fracture width in fracturing stimulation， it is determined that increasing the viscosity of fracturing fluid is a more economic and effective stimulation technical measure. The design of clean gel fracturing fluid formulations for water wells and middle and low temperature geothermal wells has been carried out； and the thickener， pH regulator， crosslinking agent and gel breaker have been selected and tested. A clean gel fracturing fluid system suitable for water wells and medium and low temperature geothermal wells （30 to 80℃） has been developed and field tested. Analysis is conducted of the application difficulties and cost of gel fracturing fluid， which supplements the research on fracturing technology for water well fracturing stimulation.

Abstract:Formation sampling quality determines the accuracy of contaminated site investigation. It is of great significance for environmental sampling to obtain samples without pollution or disturbance， but with the intact structure and the required core recovery. The sandy pebble layer is featured of soft and hard alternating with loose structure， resulting in low sampling rate， easy damage to the sample structure and low sampling efficiency. With regard to the pollution detailed investigation of a chemical park of a key industrial enterprise in Wuhai City where the high-frequency impact direct push drill was used together with the split tube sampling drilling tool， this paper introduces the high-frequency impact direct push split tube sampling technology and its application performance. The core recovery of this process in the sandy pebble layer was more than 85%， and the samples were kept highly undisturbed， which provides a reliable reference basis for drilling and sampling in this kind of stratum in the later stage.

Abstract:In order to improve the effect of high-level directional drilling in the roof on the goaf and upper corner gas control， a layered arrangement of high-level directional boreholes was proposed， and field tests were carried out in Shuguang Coal Mine. Analysis of gas drainage data of high-level directional boreholes at different depth， and gas drainage effect of high-position directional boreholes in the entire gas drainage cycle showed that gas drainage effect of high-position directional boreholes fluctuated throughout the entire drainage cycle in general. Drainage effect was relatively stable over the middle hole section since it was located in the roof crack zone； while gas drainage effect fluctuated greatly over both top and bottom hole sections since they were located in the build-up sections of the drill holes and did not enter the roof fissure zone， and were affected by the overlap of the drainage holes from the front and rear drill sites. In order to improve gas drainage effect of high-position directional drilling， a large entry angle or a high-bent mud motor can be used to reduce the length of the build-up hole section and increase the overlap length of the drainage holes from the two adjacent drilling sites so as to reduce the proportion of both top and bottom hole sections， and increase that of the middle hole section.

Abstract:In view of the complex strata conditions at Roof 36-700 in the third mining area of Dongbaowei Coal Mine， as well as the problems such as heavy workload of conventional drilling， insufficient depth of single holes， difficulty in drilling， low concentration of gas drainage， coal mine underground directional drilling equipment was tested to drill large-diameter high-level roof directional holes in complex strata in Dongbaowei Coal Mine. According to the actual geological conditions of the coal seam roof， six ?120mm high-level directional boreholes with 120mm large diameter were drilled in the roof of the 36# coal seam. The completion rate of the holes with a depth more than 300 m reached 83.3%， with the maximum hole depth up to 510m. The gas drainage concentration with large diameter high-level roof directional drilling was 66.7% higher than that with conventional drilling in the original working face， resulting in significant gas extraction effect. The successful application of large-diameter high-level roof directional drilling provides technical support for its promotion and application in Dongbaowei Coal Mine and mining areas with similar conditions.

Abstract:After the accident happened in Hushan Gold Mine， our unit was required to construct No.6 rescue borehole by the emergency rescue headquarters. In view of the characteristics in this mining area， such as high hard granite， broken and water-rich formation， a complete construction technical plan was formulated from equipment installation to construction technology and operation flow； thus avoiding the delay in work and time， and secondary accidents in the rescue process as well. The pneumatic DTH hammer was used to drill the whole borehole with the drilling parameters reasonably adjusted， which not only solved the problem of slow advance and low drilling efficiency in granite， but also ensured that the borehole entered the predetermined target zone at the first attempt. The construction was “stable， accurate and fast”， leading to successful completion of the rescue hole.

Abstract:Well D19 is an exploration hole in the geothermal clean energy survey and evaluation project in Xiong’an New Area. Drilling was completed at 4021.78m， penetrating two thermal reservoirs each in Wumishan Formation and Gaoyuzhuang Formation. Gas lift reverse circulation drilling was used to deal with serious leakage of the thermal reservoirs and protect the thermal reservoirs. The drilling equipment was selected， and the setting depth of the dual wall drilling string and the air volume were tested and optimized. In view of the drilling difficulty due to blockage in the return （cuttings） channel encountered in complex broken strata in the process of gas lift reverse circulation drilling， an anti-blocking inlet sub suitable for the reverse circulation drilling broken strata with protection of the inlet （cuttings） port have been developed. It effectively solved the blockage difficulty with gas lifting reverse circulation drilling in broken formation， and the drilling job was successfully completed. The gas lift reverse circulation drilling process for extremely broken thermal reservoir has been improved， which lays a foundation for the application and promotion of the gas lifting reverse cycle drilling process in broken thermal reservoirs.

Abstract:In order to recognize the regularity and differences in the selection and design of the mud pump type for the slurry shield， in view of the shortcomings of the existing research， the statistical analysis method is adopted to analyze the 17 key parameters with regard to 15 field cases， including the diameter of the excavation， the length of the tunnel， the main stratum， pipe diameter， density and flow of inlet and discharge mud. Six conclusions are obtained， such as the first-order linear regression equation between the pipe diameter， density and excavation diameter of inlet and discharge mud， the selection rule of inlet and discharge mud density for different formation； and they have been successfully applied to the ventilation shaft slurry shield section between Binhai Xincheng Station and Airport Station on F1 Line of Fuzhou Metro. The research results can provide new ideas for the selection or evaluation of mud pumps in the future.

Abstract:China is a mountainous country with complex and diverse terrain and diverse geological conditions. Geological disasters occur frequently during the flood season each year， which is prone to induce landslides， collapses and mudslides， etc.， posing a great threat to national economic construction and personnel safety. Since the disaster occurs during the main flood season， the treatment of the slopes in such conditions is all emergency projects， and the construction period is tight. The small-diameter steel tube soldier piles， due to its characteristics of fast construction speed， small excavation amount and small disturbance to slopes， is applicable to emergency works with tight deadlines. Taking a specific project as an example， this paper analyzes the deformation mechanism of the slope retaining wall， and describes the the treatment plan with small-diameter steel tube soldier piles. The treatment increased anti-overturning ability of the retaining wall， and effectively solved the problems of insufficient bearing capacity of the retaining wall foundation and the secondary disasters such as slope collapse caused by large-scale excavation of foundation.， It can provide reference for similar projects.