DonNTU   Masters' portal

Viglay Anastasia

Mining and Geological Department

Department of Technology and Engineering Exploration

Speciality Technology and technology development of mineral deposits

Develop a set of downhole samplers percussion with hydraulic drive

Scientific adviser: Artur Karakozov

Resume Abstract

Abstract

Содержание

• Introduction
• 1. Justification of themes and names, the urgency of the
• 2. The purpose and objectives of the study, expected results
• 3. Analytical review of the
• Conclusion
• References

Introduction

Drilling wells - an essential element of all stages of field development works on all types of mining - from exploration to commercial production. Today there are many ways, technology and technical means of drilling. However, experts do not stop to explore, invent and improve technology in the field of knowledge.

Magіsterska robot prisvyachena rozrobtsі tehnіchnih zasobіv for burіnnya geologorozvіduvalnih sverdlovin sea oskіlki іntensivne vikoristannya mіneralno-sirovinnih resursіv continental shelf vimagaє stvorennya novih visokoefektivnih tehnіchnih zasobіv vіdboru for samples with donnih vіdkladen rozvіdtsі rodovisch korisnih copaline that budіvnitstvі morskih vidobuvnih sporud i komunіkatsіy.[1]

1. Justification of themes and names, the urgency of the

Energy Strategy of Ukraine up to 2030 is planned to increase oil and gas production on the shelf due to the construction of new offshore production platforms, which requires large volumes of geotechnical drilling wells up to 100 meters in the engineering-geological studies jackup drilling rigs. But modern technology and technical means of soil sampling during the drilling of these wells need to be improved, because they are ineffective when sampling in clayey soils and sands of different density.

Ukraine in recent years, a number of technical means and technologies hydropercussion drilling geotechnical boreholes, which can significantly improve the technical and economic performance of drilling operations. Based on previous studies proposed further development of downhole samplers for geotechnical wells are planned on the basis of improved technologies and technical means to ensure the geotechnical drilling of wells up to 100 meters with a jack-up drilling platforms.[8]

These results will significantly improve performance and reduce the cost of drilling for geotechnical investigations on the shelf.

Therefore, the development of technical means for drilling on the shelf today is the actual direction of science.

Communication with the scientific programs, plans, themes.

This paper is a piece of research carried out in this direction in the department TTGR DonNTU. The work done at the request of JSC "Company" Yugovostokgaz "and associated with the implementation of State Program of development of mineral resources of Ukraine (the Law of Ukraine of 22.02.2006 № 3458-IV).

2. The purpose and objectives of the study, expected results

The aim of this work is to improve downhole samplers percussion with hydraulic drive for drilling offshore.

Main objectives of the study:

1. Develop improved design schemes downhole samplers percussion with hydraulic drive for drilling offshore.
2. Conduct computer simulations to enhance neskalnye soils of different configurations of downhole probes and data analysis.
3. Justify the design parameters of downhole samplers percussion with hydraulic drive for drilling offshore vypolnit3D modeling and production drawings developed samplers.

idea work

The use of downhole sampler set of movable core (relative to the housing impact site) to increase drilling speed and quality of core material.

object and subject of study

object of study : downhole samplers percussion with hydraulic drive for drilling offshore.

subject of study : Workflows in downhole samplers percussion with hydraulic drive for drilling offshore.

possible results to be expected when the master's work, their novelty and significance:

The design scheme
1. downhole samplers percussion with hydraulic drive. Dependencies
2. ROP on the layout of the downhole sampler.
3. Recommendations for choosing the design parameters of downhole samplers percussion with hydraulic drive.

The value of the work is to determine the influence of the design concept downhole percussion sampler with hydraulic drive on the mechanical drilling speed and the justification of its design parameters for different applications.

scheduled testing results (participation in conferences, filing papers for the competition, publishing, filing for an invention, etc.)
involvement in the republican scientific-technical conference of students' Drilling. " Submission of work for the competition of student research projects.

3. Analytical review of the

As you can imagine analogues hydropercussion shells units PGU-72 and PUVB-150.

Installing the PSU-72 belong to a slight technical facilities (LTF), which are designed to odnoreysovogo drilling subsea wells in the rocks of I-IV categories of drillability. PSU-72 is designed for work with small and medium vessels, including the non-specialized vessels, with the necessary means of lifting and working space for placing and processing plants on the deck. Operating systems do not require fundamental changes in the composition and layout of deck equipment of ships. [2]

Tripping can be performed with the use of the ship's winch and derrick standard. Most often the place of the ship's winch installed more convenient to use drawworks planetary type.

To drive hydropercussion mechanism used sea water, which is fed by a hose mud pump discharge pressure. The latter can be located on deck and below deck boats. With sufficient shipping capacity mud pump drive motor is provided on the ship's power source. Stand-alone diesel or diesel generator to drive the pump is used in case of a limited power supply to the vessels.

Main elements of the installation are the stabilizing foot and immersion hydropercussion drill (PBS) containing 5 hydraulic hammer and core set of 6 (Fig. 1).

Stabilizing support made in the form of bottom frame 8 equipped with rack rails 4 which are rigidly mounted in the base frame. At the top of racks available crosshead 3, providing the opportunity to lift installation due to the interaction with the carriage 7. The descent or ascent on the rope is set to 2, with slide 7 slide on four racks, providing free axial movement of the submersible drill. Liquid hydropercussion drive mechanism is pumped through the hose 1.

The composition of PBS (Fig. 2) are kinematically and mechanically connected components: hydraulic hammer with a pumping unit and core set consisting of 15 single-core barrel length of 4 m diameter and 146 mm petal shoe 17 with the core catcher 16.

hydraulic hammer work, which is the causative agent of shock pulses, is as follows. In the initial position of the firing pin 10 under its own weight in the lowest position. The inlet valve 2 is closed and the final four open. Water supplied from the mud pump through the hose to the adapter 1, flows through the channel "b" and then, through the gap between the housing 8 and the cylinder 5, the piston 6, causing the force of pressure rise of the piston-striker

liquid located above the piston 6 is displaced through the axial channels are shifted valve box 3 and channels "a" in the hole. During the course of the firing pin up valve group remains in its original position due to fluid pressure in the intake valve 2. With the rise of the piston-striker spring 7, the shank resting on the exhaust valve 4 is compressed.

Piston, having a distance meets the exhaust valve 4, and deals a blow to him. Due to the impact energy and the spring force closes the discharge valve 4 shifted axial channels of valve box and the intake valve 2, moving up to open the central channel of valve box, providing access to the upper fluid and the cylinder 5.

Since the area of ??the piston from the top of the cylinder is greater than its area from the lower chamber, the firing pin 10 rush down. In this valve group will retain its top position by water pressure release valve 4. At a time when the piston shaft grab the valve 4, the rearrangement of valves in place starting position. Then the cycle of repeated hydraulic hammer.

In times of permutation valve firing pin, due to stored energy, continues to move up or down before the collision with the anvil 9 and 12.

In the process, PBS hydraulic hammer drives the motor pump unit built, providing a constant movement of fluid flow on the bottom hole with forced its removal from the cavity nadkernovoy auger 15. Housing the pump unit 12 is an anvil, in which there are 14 suction and discharge valves 13. The role of the displacer piston rod 11 carries. When moving the rod 11 up through the valve 14 is sucked from the well fluid through the shoe 17 in the space under the rod, and in its course down into the well fluid is displaced through the outlet valve 13.

Contact circulation of liquid in the bottom hole significantly reduces the likelihood of "pile" effect that increases the voyage uglubke core set, especially in tight sands and clays, as well as increased information content of the geological drilling, providing a yield of 95-100% of the core, in m . pm when drilling in loose, noncohesive soils.

By setting drilled hundreds of exploratory and geotechnical wells to a depth of 3-4 m with a diameter of 125 mm cores sampled. The level of effectiveness of PGU-72 confirmed the possibility of obtaining samples in soils I-IV categories of drillability - from silt and sand watered to dense argillaceous rocks with inclusions of pebbles, boulders and layers of hard sandstone and limestone.

The disadvantage of installing PGU-72 is the low reliability of hydropercussion mechanism. Due to the fact that the inlet valve 2 is fully perceives the dynamic pressure of hydraulic fluid, hydraulic hammer running difficult. To start the mechanism, additional devices to continuously increase the supply of mud pump and dramatically drop the pressure in the discharge line.

By 1977, the PGU-72 has been completely replaced with a similar design for immersion installation of impact-vibrating drilling PUVB-150, which provided samples in the same range of sediments to a depth of 5 m

In contrast to the version of the PGU-72-150 Installation PUVB fundamentally changed the design of hydraulic and pumping unit, which greatly increased the reliability of hydropercussion drill.

As a stabilizing support base used by the installation of PSU-72.

Marine exploration organizations in carrying out research on the seas of the Far East and the Far North with installing PUVB-150 were drilled thousands of wells in the sediments of various categories of drillability.

In PUVB-150 implemented the ability to select a wide range of sediment from silt and very fine-grained sands flooded to very dense sands and hard clays, including, with inclusions of pebbles, boulders, debris and sand layers (with a diameter of 125 speakers extracted mm). The yield of cores was 90-95%, with good representation and its lack of visible violations of the structure. Selected factors are particularly important for geotechnical investigations in the studied areas of marine waters. Installing PUVB-150, is shown in Fig. 3. [2]

The sequence of operations in the technological cycle of sinking wells installation PUVB-150 is:
• Under the stabilization of the ship after anchoring means work related to the anchor chain stretch in the direction of flow to obtain evidence consistent course of the vessel at the point of drilling.
• descent to the bottom of the installation include: the rise of PBS on the deck of the horizontal to vertical, the rise of the installation of the bulwarks with boom and winch, the output setting for a board with the boom down and stabilize the installation on the bottom.
• After stabilization, installation is included at the bottom of mud pump. With the control valve is increased fluid flow in the discharge line, resulting in a hydraulic hammer and the subsequent launch of its output for the operating mode of operation. Pitting cable, perform a visual check of penetration to the desired length of the flight or the length of core collection.
• When removing PBS from the well of the time spent on the failure of the core. After installation of the bulwarks rise, it is translated using the arrows on the deck. Then open the latch, made at the base of support. PBS is derived from the support and fit into a horizontal position on a special stand.
• to extract core samples from the core barrel unscrewed the shoe and the body core breaker. The upper part of the drill up to 2.5-3 m and the lower part of fixed rope at a distance of 0.3-0.4 m above the deck. Kern stands out due to short hydraulic hammer inclusions (or tapping with a hammer on the core barrel) in a nylon or metal trough 3. After complete extraction of the core core barrel is washed, and PBS is lowered to its original horizontal position on the stand.
• Preparation for launching the drill involves screwing on the core barrel with a core catcher shoe PBS, tightening threaded core set of buildings and hydropercussion mechanism. Jump to a point
• includes drilling operations associated with the removal of the vessel to the point of drilling waste, and the transition to the new current sampling.[2]

The work of installing hydraulic hammer sampler PUVB-150 is shown in Fig. 4.

Conclusion

Master's thesis is devoted to the actual problem with the increase in oil and gas production on the shelf due to the construction of new offshore production platforms, which requires large amounts of drilling geotechnical boreholes.

In carrying out the work of master plan to develop methods for calculating the probe with a hydraulic hammer action, justified by the design parameters and technology application.
The design and it is developing documentation.

Further research focuses on the following aspects:

1. Quality improvement construction schemes downhole samplers percussion with hydraulic drive

2. Definition ROP depending on the layout of the downhole sampler.

3. Design guidelines for choosing the design parameters of downhole samplers percussion with hydraulic drive.

In writing this essay master's work is not yet complete. Final completion: January 2013. The full text of the and materials on the topic can be obtained from the author or his head after that date.

References

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2. Калиниченко О.И., Каракозов А.А., Зыбинский П.В. Погружная гидроударная установка УМБ –130 для многорейсового бурения подводных скважин.// Сб. научн. Трудов.  – К.: ИСМ им. Бакуля, ИПЦ АЛКОН НАНЦ. Киев,2003. С. –63 –68.
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