Configuration of Screw Drill

Screw drill is one kind of downhole drill motor, it makes drilling fluid as a driving force, the fluid pressure energy converted into mechanical energy. Screw drill is made of the bypass valve, screw motor (rotor and stator), universal joints, bearings and drive shaft of several parts, the core part is the screw motor. For screw motor rotor and stator, teeth number of the statorZ1 is more one than the rotor Z2. Design of high-speed screw drill should use screw motor with small gear ratio, designed for low speed high torque of screw drill should use a large number of teeth than the screw motor. With the increase of the number of teeth ratio of rotor-stator, its efficiency tended to decrease; The output torque of screw drill depends on motor pressure, the output speed depends on the flow rate of working medium.

How to Prevent Non-magnetic Drill Collars Fracture?

Application of non-magnetic drill collars played a very important role, especially in the oil drilling industry, it played a crucial role, but in the use of non-magnetic drill collars, sometimes it occurs fracture phenomenon, what reasons can cause fracture? How to prevent non-magnetic drill collars fracture?

Through a series of practical application, we can get the conclusion. The biggest reason of non-magnetic drill collars fracture is fatigue fracture, since the non-magnetic drill collars actual drilling pressure is greater than the critical pressure bent, non-magnetic drill collars will bend, if drill collar and drill bit does not match, or drilling speed is too large, which will accelerate fatigue crack initiation and propagation, resulting in breakage of the drill collar. The user increases the outer diameter of the drill collar, appropriately reduce the drilling pressure and speed, also note that the non-magnetic drill collars for testing, these can prevent fatigue failure.

Drill Pipes Role

Drill pipes are steel tubulars fitted with threaded ends, which are commonly used in tension in the top part of the drill string to pump fluid and transmit torque to the bit.

Drill tail has screw thread, used for connecting rig equipment and bottom of the prepared grinding equipment or hole drilling devices. The purpose of drill pipe is to deliver the drilling mud to the drill bit, increase with the drill bit, reduce or rotate the bottom outlet means. Drill pipe must be able to withstand great external pressure, twisting, bending and vibration. In the mining refining process, the drill pipe can be used multiple times.

Why Non-magnetic Drill Collar Is Essential Equipment?

With the continuous advancement of technology, various types of processing tools have been developed well, for the non-magnetic drill collars, it has become one of the necessary drilling equipment in the drilling industry. Today, as the device manufacturers, we summarize the relevant non-magnetic drill collars content related effects, we should you not miss.

In fact, non-magnetic drill collars is made of low-carbon high-chromium-manganese alloy steel, it is the result of stringent chemical composition ratio by forging and refining to achieve its mechanical properties. The device can be prevented drill string differential block during drilling pressure, spiral groove allows the mud flow freely around the drill collar to prevent the formation of pressure balance block, thereby effectively preventing differential sticking phenomenon. Of course, also possible to reduce the area of contact with the borehole wall, it can effectively reduce the possibility of generating a differential pressure block.erating a differential pressure block.

Application of Mud Purification System

Mud purification or mud circulation system has been widely used in various engineering fields, such as oil drilling, trenchless, coal-bed methane drilling and others. Core separation equipment for all systems is the shale shaker, mud cleaner, desander, mud decanter centrifuges. For different industries and fields of application, select the device type and function is different, but the principle is the same for all systems, disposal of the material will be separating the solid and liquid phases.

Mud cleaner is secondary and tertiary solids control equipment, mud cleaner combines mud cyclones, sand cyclone and underflow shaker. Mud cleaner structure is compact, small footprint, mud cleaner is the ideal choice for efficient drilling mud cleaner equipment.

Mud Motor Workflow Details

Mud motors are widely used in oil and coal directional drilling, horizontal wells, cluster wells, vertical wells and other drilling, suitable for drilling, whipstocking, twisted position, coring, reaming, sidetracking and workover operations.

Mud motor is a kind of mud-powered downhole drill motor. Mud pump mud flow enter into the motor through a bypass valve, certain pressure difference between the inlet and outlet of the motor, promote motor rotor rotation, then make the torque and speed passed to the drill bit by cardan shaft and drive shaft. Screw drill performance depends on the performance parameters of the screw motor. Rotor of screw drill can drive drill bit do directional drilling operations, continuously improved efficiency, site work order is more stable, can complete the processing requirements of high precision work. Screw drill rotor can improve torque and power, increased footage rate, while reducing drill pipe and casing wear and tear, can accurately orient whipstocking, correction, can be used for vertical wells, horizontal wells and cluster wells and workover operations.

How Long Is Lifetime of Screw Drill?

Lifetime of screw drill is generally 150 to 200 hours, its weakness is the stator rubber at low temperature level, bearing easily damaged.

We are now stepping up research and development for manufacturing reliable bearing system and elastic material made of the stator, and this material may have wear-resistant and high temperature resistance, so that the screw drill working life has been significantly improved. And the development of low speed high torque applied to the screw to drill deep and ultra-deep hole.

What Does Slick Drill Collar Mean?

A slick drill collar, also known as a drill collar, is a tubular piece of a drill string which provides weight on a bit for the purpose of drilling. While drill pipes become the bulk length of drill strings, drill collars create solely a little quantity. They need thick walls machined from the solid bars of steel. The steel bars are plain steel but are non-magnetic premium alloys or non-magnetic nickel-copper alloy. These bars provide a path for pumping drilling fluid via the collars.

The drill collars are used in spiral and slick designs with some additional features, it can be used for trouble free and safe operations. The spiral collars prevent drill strings from getting stuck in holes by allowing lubricant and drilling debris. 

Necessary Screw Drill in Drilling Industry

Screw drill is drilling tools in drilling industry, it is a kind of displacement downhole drill motor that make drilling fluid as a driving force, then transform the fluid pressure energy into mechanical energy. Let us certainly want more in-depth look at the knowledge of the device.

Screw drill is mainly made by the bypass valve, hydraulic motor, cardan shaft and drive shaft. The screw motor is the main component of drilling, many practical and theoretical results show that the motor properly to work effectively, each stage of the motor can withstand the pressure drop of no more than 0.8Mpa appropriate, or motor has loss. Speed decreases rapidly stopped the motor. Mud flow should be within the recommended range, otherwise it will affect the efficiency of the motor, and even increase the wear and tear. Screw motor performance parameters is the main performance parameters of screw drill.

Non-magnetic Drill Collar Length Selection

Non-magnetic drill collars get more general use in drilling operations, having a very good performance, other drill can not be replaced. Non-magnetic drill collars located in the lower part of the drill pipe, in the upper part of the drill bit and downhole drill, it is a major component of the BHA. Non-magnetic drill collars are made of low magnetic permeability stainless steel, inside and outside the tube cross section is circular. Well trajectory measuring instrument is non-magnetic drill collar to prevent magnetic interference, which could affect measurement accuracy.

Non-magnetic drill collars not only play a role in the drill collar in drilling horizontal wells, but also has low permeability, it can be used as the downhole magnetic measuring instruments to create a non-magnetic interference working environment.

Several Commonly Used Horizontal Directional Drilling Steering Tool

The first: dental plate drill. There are different designs for different formations. Usually used for soft to medium hardness and hardness more uniform clay or loose sand.

The second: shake roof drill bit. Shake roof drill bit is suitable for hard formations and soft rock that propulsive force can not penetrate.

The third: Whipstocking short BHA, this BHA generally used for large directional drilling through soft formations.

The fourth:Mud Motor BHA, mud motor is whipstocking tool, also is got into power tools, mainly applied to hard formations, rock formations.

The fifth: rock drill guide system. The rig has two sets of top drive apparatus, special drive drill system, BHA is very similar to mud motor, but without the drive section of the mud motor.

The sixth: Horizontal directional drilling motor DTH drilling assembly. This drill powered by compressed air, for small rigs short-range, medium-to-high hardness through rock formations, efficiency and higher compared to other tools guide.

Luhai New Strategy

Taking industrial technology reform and innovation as our mission and healthy, green and environmental protection as the R&D philosophy, actively responding to the new energy policies advocated by the state, we provide domestic users with safe and reliable heating system solutions. We research into and develop a series of environmentally-friendly new energy technologies, including air source heat pump, ground source heat pump, and terrestrial heat exploitation for heating.

As we all know, temporary heating methods include: concentrated heating of heating companies (which burns coal, would cause serious environmental pollution), natural gas heating, air conditioner heating, electric warmer and others. The air conditioner heating has large energy consumption, and water losses would lead to room seasoning, staying at such environment for long time would cause respiratory disease, what’s more, bad indoor ventilation would easily breed bacteria and mites, which would be great threat for human health; electric heater would cause indoor seasoning, what’s more, the heat radiation range is small, and the power consumption is quite large; the gas boiler has more emissions, and is not environmental-friendly, there are potential safety hazard as well. Compared with them, there are no such problems in the air source heat pump technology. 

In recent years, with the promotion of government’s project of “Coal to electricity”, the air source water heater gets more and more known and used by the public. The electric water heater directly heats the water by electricity, while air source water heater does not need electric heating element to directly contact the water, but transfers heat through media (refrigerant), the refrigerant in the evaporator absorbs the low-temperature heat in the air, transfers it into high-temperature heat energy through compression of the compressor, then the refrigerant releases heat and heats the water, then the liquid refrigerant returns to the beginning through decompression of the expansion valve, moving in circles. Thus, what is mainly consumed in this process is the energy in the air, and it only needs to consume electricity when the compressor works. To produce the same amount of hot water, the air source water heater consumes 1/4 of the electricity consumed by the electric water heater, which is energy-saving and safe. The electric water heater is installed in the bathroom, staying in humid environment for long, which makes it easy to be damaged or leak electricity. However, the air source water heater realizes thorough separation between water and electricity, whose circuit is uneasy to age, and can work 2-2.5 times longer than the electric water heater.

 The air source heat pump heating is widely acknowledged in the hygiene, safety, comfort and health aspects. It is energy-efficient, heating-comfortable, safe to be used, environmentally-friendly and needs no adding of any fuel during operation, which leaves no fire hazard or carbon emission, creating green and healthy environment and gaining the unanimous favor and praise from the majority of users. It only requires users to select the device with appropriate capacity configuration. The high-quality heating equipment can guarantee the stable heating and the sufficient heat sources of hot water heating. It is an energy-saving equipment combining heating and hot water bath into one with relatively low cost put in and low expense for operation, providing you great comfort. The nation is also devoting great efforts in the promotion and application of this technology. In the future, it will become the star heating product and an indispensable part in home lives.     

                   

8th anniversary

On the occasion of the 8th anniversary of the founding of Shandong Luhai Petroleum Technology Co.,Ltd., the Speech Contest for the 8th anniversary was held on August 22 for the purpose of publicizing the company's development achievements and employees' moving stories, advocating the employees to share the same breath and destiny with the enterprise, further strengthening the enterprise cohesion and employees' understanding and identification of the corporate culture, and providing a stage for employees to show themselves, with the attendance of all employees.

During the speech, judges carried out integrated scoring for the speakers, and selected the top three winners.

With different kinds of speech styles, from the humorous jokes targeted at the hot topics to moving and thought-provoking deeds presentation, as well as the impassioned performance, the speech activity was held successively with the thunderous clapping and applauses. Finally, Zhang Bo from the Planning Department, Zhou Tao from the Enterprise Management Department, and Li Tingting from the Finance Department were selected to be the top three winners respectively.

In today's world, the market competition is being increasingly fierce, and the importance of corporate culture construction has been recognized by a growing number of enterprises, as a result, the corporate culture has been taken as a powerful tool to improve competitiveness, and the universal psychological identification of the enterprise by both the leaders and employees has been the core idea. Build the spirit of the industry, shaping brand culture is the common pursuit of the enterprise.During the building of enterprise culture, the enterprise culture evaluation as a platform to promote the cultural construction plays an increasingly important role.Shandong Luhai Petroleum Technology Co.,Ltd has always adhere to the corporate culture as a carrier to create a workers' factory that is home, we rely on the survival and development, "the harmonious atmosphere since the construction,and fully mobilize the Luhai people to build Luhai initiative.

What LUHAI could offered compare with our competitors?

Luhai is successfully listed on off counter board last year, stock code 832799, the capital value and financing ability has been greatly improved.

We have famous legal firm and financial firm to help us toward internationalization.

At present, there are a number of investment institutions to participate in the private placements.

Strategy/manpower（technicians) -stable.

Decision making-FAST decision making speed (private own company-public company)
Policy-less impact by government policy changing.

R&D input- 12~15% of income yearly is putting into product and technology development.

Aggressive company-we managed to increase our market value from 10 millions to 300 millions RMB within 8 years, increased 30 times. We are seeking the leadership within the industry of this particular product-drilling motors.

LUHAI Mission:To be the Best Drilling Motors Manufacture in the world in Five Years Time.

Why choose LUHAI product?

Luhai was established in 2008, same year got the entry licenses (Grade One) of CNPC, Sinopec and CNOOC. We managed to win CNPC tenders every year which is very rare among our competitors. (e.g LILIN got temp suspended till Oct 2016)

2009, Luhai first set of drilling motor was proven successful operation on site, the sales reached 40 millions RMB at the end of that year.

Since then, Luhai concentrate on drilling motors production.

Assembled 3 sets of NEW power section in March,2016 Rubber hardness is 90.

Stator (W01424725) match with Rotor (W01242748), interference fit 0.15. The whole drilling motor test: pump start pressure is 2Mpa under 100L/min.

Stator (W01424729) match with Rotor (W01233035), interference fit 0.145. The whole drilling motor test: pump start pressure is 2Mpa under 100L/min.

Stator (W01424697) match with Rotor (W01255243), clearance fit 0.09. The whole drilling motor test: pump start pressure is 1.5Mpa under 100L/min.

Note:

The average Chinese product got 1 Mpa pump start pressure under the same flow rate.

Luhai adopts NOV/SLB profile.

NEW power section drilling motor （NDM）and standard drilling motor are simulation used in Gansu district.

NDM was running in directional drilling section at 4:30,May 8th,2016 date in and at 21:50,May14th,2016 date out ;depth from 940m to 1928m;pure drilling time 122hours;circulating time 39.3hours;average footage 8.1m/h while the average footage of standard drilling motor is 6.3m/h.

Compare with standard Chinese product, LUHAI NDM’s drilling efficiency increased 28.6%.


Comment: NDM adopts high quality rubber elastomer which improves volume capacity. Along with the rubber mechanical properties increased, the output torque and power increased as well.

Warmly celebrate the Luhai Energy Co.,Ltd. was formally established

In order to better serve foreign customers, to meet customer needs,In May 2016,Shandong Luhai Petroleum Technology Co., Ltd. announced the formal establishment of the international business company Luhai Energy Co., Ltd. in Beijing.

Shandong Luhai was founded in year 2008,which is an is an integrated enterprise of design, production and sale of drilling motor, drill bit and measuring instruments, new energy development of petroleum horizontal wells and geothermal drilling and other engineering technical services.

In addition to the advanced products, Luhai Energy will equipped by the capital advantages and technical specialty, to invest in the revolutionary technology R&D for drilling tools and drilling equipment, continuously develop overseas distributor system, seek the oversea cooperation opportunities, focus on the product performance enhancement, maintenance and repair services, and tools/equipment trade/leasing business.

Expanding our service around the world with our admirable virtue for every customer. Luhai Energy will provide honest, trustworthy, and moral services for the global customers.

completion of drilling the first directional well in Yaerxia Block of Petro China Yumen Oilfield

On September 23, the Company smoothly completed the drilling of Ya 6-12 well in Yaerxia Block of Yumen Oilfield. As a directional well under general contracting requiring fast construction, the well is designed to be 3,500m deep with the second section of 8,00m to 2,700m. The construction period is designed to be 15 days. Fast and vertical drilling is required. According to the requirements of Party A, the construction personnel of the Company on the site overcame various difficulties, like complex stratum structure, big dip angle and poor drillability of stratum on the premise of optimizing drill assembly, rationally choosing screw drills, configuring rational drilling parameters in combination with the actual situation underground, and elaborately using underground measurement while drilling (MWD) instruments.

With a maximum deflection of 1.1° and maximum dogleg angle of 0.98°/30m, this well presents good indicators. We used 7LZ172*7.0 screw drill made by the Company throughout the process. Thanks to the characteristics of high torque at slow speed, strong overload resistance as well as fast and stable drilling, the drilling tool is highly recognized by customers and is extensively promoted and used in this area. The personnel of the Company for drilling orientation met challenges, made painstaking and surmounted weak network and communication signals in spite of large temperature difference between days and nights and severe desert environment. On the premise of zero failure of screw instruments, the construction tasks of this phase were completed smoothly in 12 days, saving three days.

The whole trajectory control process is steadily advanced as per customer’s operation requirements. The construction tasks are completed efficiently, shortening the drilling period.build a model image for improving the well drilling speed in this block, with an unanimous praise from Party A and the construction drilling crew. The company fulfilled the zero breakthroughs in Yumen Oilfield, accumulated valuable experience for the further development of directional drilling services to lay a good foundation for the expansion of western engineering service market.The successful completion of the well drilling marks that the company has the capacity of providing the high quality, safe, fast and efficient directional construction services for all construction drilling crew.

Luhai Petroleum "New Three Board" Listing Ceremony Was Held in Beijing

On July 31, 2015, Shandong Luhai Petroleum Technology Co., Ltd. held a grand listing ceremony in "National SME Share Transfer System" on Beijing Financial Street. Liu Hongxiao, company board chairman, and the responsible persons in the relevant departments attended the listing ceremony.

The responsible persons from dozens of securities investment companies, major customer representatives of companies, local governments and financial institutions attended the listing ceremony. Ma Yunyun, Party Secretary of Lingcheng District of Shandong Province and Chairman of District People's Congress, and Kong Liang, deputy head of the district, delivered speeches on the listing ceremony. Liu Hongxiao, board chairman, spoke on the ceremony. The listing ceremony was completed successfully in the loud bell tone, and at the moment the company stepped successfully into a new level.

Luhai Petroleum is an integrated enterprise of design, production and sale of drilling motor, drill bit and measuring instruments, new energy development of petroleum horizontal wells and geothermal drilling and other engineering technical services. Since 2008, the company always adheres to the innovation-driven strategy, develops sophisticated products actively and has obtained 11 national patents.in China, our products are supplied to CNPC, Sinopec and CNOOC; in international market, we export products to more than ten countries and regions, such as the United States, the Middle East, and Russia. Last September, the enterprise established the R & D center in Houston, which increased the service life of PDM drill as our leading product from original 200 hours to 300 hours through integration of the world’s most advanced technology. This product will be put into the market in large batches at the end of this year, which is expected to become a new profit growth point.

Ma Junyun expresses his congratulations on the listing of Luhai petroleum in the “New Three Board”. Ma hopes that the enterprise could take the opportunity of the listing, fully utilize the financing function of the capital market, make continuous improvement to the product structure, optimize the market layout, improve the managerial level, make strong efforts on enhancing independent research and development, as well as technical innovative capabilities, in order to improve the core competitiveness of the enterprise and make greater contribution to the economic and social development in Lingcheng district.

Motor Power Section

Power Section

Power Section – Rotor & Stator

Power Section – Parts

Common Lobe Configuration

Stators - Conventional & Evens Wall

Stators Types

Luhai mud motor

Luhai Drilling motors are Positive Displacement Motors (PDM) which use the flow of mud pumped down the drill string to rotate a drive shaft to which the drill bit is connected.

• The mud flow causes the bit to turn independently of the drill string. Rotation being generated by forcing the drilling fluid between a helical shaped rotor and stator.

ROP is higher because..... 
– Reduces casing wear 
– Reduces drill string wear –
– Reduces drill string fatigue –

Drill String RPM Greatly Reduced…..
– Power is not wasted turning the drill string
- Torque is consistent
-Total RPM is typically higher

Normal mud motor construction consists of a top sub, which connects the mud motor to the drill string; the power section, which consists of the rotor and stator; the transmission section, where the eccentric power from the rotor is transmitted as concentric power to the bit using a constant-velocity joint; the bearing assembly which protects the tool from off bottom and on bottom pressures; and the bottom sub which connects the mud motor to the bit.

When the bit is bottomed and the motor is effectively working, there is a notable increase in the pressure in the fluid system. This is caused by a restriction within the motor and is termed the "differential pressure". If this differential pressure is too high then the motor can stall which means the bit has stopped turning and this can cause severe damage to the internal surface of the stator.

A mud motor is described in terms of its number of stages (usually three), lobe ratio and external diameter. Stages are the number of full twists that the stator makes from one end to the other and the lobe ratio is the number of lobes on the stator, to the number of lobes on the rotor (the stator always has one more lobe than the rotor). A higher number of stages or the number of lobes indicates a more powerful motor, capable of producing more torque. A lower number of lobes indicates a reduction in the torque produced but a faster bit rotation speed.

The operating parameters include flow rate, bit rpm and torque. The relationship between the rotor and the stator geometry determines the rotational speed and torque. The rotational speed is proportional to the flow rate and torque is proportional to the pressure drop in the fluid as it flows through the motor. The more lobes the higher the torque and the slower the rpm.

The use of mud motors is greatly dependent on financial efficiency. In straight vertical holes, the mud motor may be used solely for increased rate of penetration (ROP), or to minimize erosion and wear on the drill string, since the drill string does not need to be turned as fast.