Interpretation of Bottom-Hole Pressures in East Texas Oil Field

AAPG Bulletin ◽  
1932 ◽  
Vol 16 ◽  
Author(s):  
E. V. Foran (2)
Keyword(s):  
Author(s):  
М. А. Куразов ◽  
З. Х. Газабиева ◽  
Р. Х. Моллаев ◽  
А. Ш. Халадов

Гидравлический разрыв пласта (ГРП) представляет собой комплексную технологию обработок скважин. При этом его следует рассматривать не только как средство воздействия на призабойную зону пласта (ПЗП), но и как один из существенных элементов системы разработки месторождения в целом. Технологические схемы ГРП, в том числе с последующим химическим воздействием, различаются в зависимости от коллекторских свойств обрабатываемых объектов. Их эффективность определяется условиями, связанными с фильтрационными характеристиками пластов, то есть коэффициентами проницаемости близлежащих и удаленных зон объекта. При этом подход к проектированию обработок ГРП будет различным в низко- и высокопроницаемых пластах, и в этой связи грамотный выбор скважин имеет существенное значение. Для исключения смыкания трещин после ГРП и снятия давления в призабойной зоне пласта (ПЗП) в скважины закачиваются различные расклинивающие агенты. Расклинивающие агенты (проппанты) должны противостоять напряжениям горной породы, удерживая трещину раскрытой после снятия гидравлического давления жидкости разрыва и обеспечивая, таким образом, высокую фильтрационную способность призабойной зоны пласта и дебиты нефти скважин. Обработки скважин проводятся с использованием стандартного нефтепромыслового оборудования и насосной техники. Промысловый опыт ГРП в условиях Верхне-Салымского месторождения (Западная Сибирь) показал его достаточно высокую эффективность. Hydraulic fracturing is a complex technology of well treatment. At the same time it should be considered not only as a means of impact on the bottom-hole zone of the formation, but also as one of the essential elements of the field development system as a whole. Technological schemes of MPG, including with subsequent chemical impact, differ depending on collector properties of processed objects. Their effectiveness is determined by conditions related to filtration characteristics of formations, i. e. permeability coefficients of nearby and remote zones of the object. At the same time, the approach to the design of GRP treatments will be different in low and highly permeable formations and in this regard, competent selection of wells is essential. Various proppantsare pumped into wells to prevent closing of cracks after MPG and to relieve pressure in bottom-hole zone of formation. Proppants (proppants) must withstand rock stresses by holding the fracture open after the hydraulic pressure of the fracturing fluid has been removed, and thus ensuring high filtration capacity of the bottom-hole formation zone and well oil flow rate. Well treatments are carried out using standard oil field equipment and pumping equipment. The field experience of GRP in the conditions of Verkhne-Salymsky field (Western Siberia) showed its rather high efficiency.


Geophysics ◽  
1988 ◽  
Vol 53 (5) ◽  
pp. 707-720 ◽  
Author(s):  
Dave Deming ◽  
David S. Chapman

The present day temperature field in a sedimentary basin is a constraint on the maturation of hydro‐carbons; this temperature field may be estimated by inverting corrected bottom‐hole temperature (BHT) data. Thirty‐two BHTs from the Pineview oil field are corrected for drilling disturbances by a Horner plot and inverted for the geothermal gradient in nine formations. Both least‐squares [Formula: see text] norm and uniform [Formula: see text] norm inversions are used; the [Formula: see text] norm is found to be more robust for the Pineview data. The inversion removes random error from the corrected BHT data by partitioning scatter between noise associated with the BHT measurement and correction processes and local variations in the geothermal gradient. Three‐hundred thermal‐conductivity and density measurements on drill cuttings are used, together with formation density logs, to estimate the in situ thermal conductivity of six of the nine formations. The thermal‐conductivity estimates are used in a finite‐element model to evaluate 2-D conductive heat refraction and, for a series of inversions of synthetic data, to assess the influence of systematic and random noise on the inversion results. A temperature‐anomaly map illustrates that a temperature field calculated by a forward application of the inversion results has less error than any single corrected BHT. Mean background heat flow at Pineview is found to be [Formula: see text] (±13 percent), but is locally higher [Formula: see text] due to heat refraction. The BHT inversion (1) is limited by systematic noise or model error, (2) achieves excellent resolution of a temperature field although resolution of individual formation gradients may be poor, and (3) generally cannot detect lateral variations in heat flow unless thermal‐conductivity structure is constrained.


1938 ◽  
Vol 6 (1) ◽  
pp. 54-59
Author(s):  
M. Isizaki
Keyword(s):  

Author(s):  
М.Р. Масаров ◽  
З.Х. Газабиева ◽  
М.А. Эдильгериев ◽  
А.Х. Меджидов ◽  
Р.Х. Моллаев

Основными проблемами, осложняющими эксплуатацию глубоких скважин (на определенной стадии разработки), являются низкие коллекторские свойства пластов и отложения в призабойной зоне пласта (ПЗП) и подземном оборудовании органических солей, то есть высокоплавких асфальтено-смолистых веществ (АСВ). Это приводит к существенному уменьшению добычи нефти, вплоть до полного прекращения притока из пласта, затрудняет, а в ряде случаев и полностью исключает, возможность проведения глубинных термогидродинамических исследований скважин и мероприятий по воздействию на призабойную зону пласта, вызывает необходимость в дополнительных затратах, связанных со сбором, транспортировкой и подготовкой нефти, что ухудшает технико-экономические показатели разработки нефтяных залежей. Для борьбы с указанными осложнениями разработаны и используются в нефтепромысловой практике большое количество технологических методов и реагентов на базе растворителей фирмы «РИНГО», ингибиторов и растворителей института «Союзнефтепромхим» (СНПХ-7909, СНПХ- 7941, СНПХ-7920М) и другие. Однако указанные реагенты и технологические схемы предназначены для обработок неглубоких скважин, где основную массу отложений составляют соединения парафинового ряда. В условиях отложения высокомолекулярных АСВ они малоэффективны или неприемлемы. В этой связи для условий глубоких высокотемпературных асфальтено-смолообразующих скважин разработаны специальные технологии обработок ПЗП и НКТ. Технология предусматривает использование для удаления и ингибирования отложений АСВ составов, включающих ароматические и предельные углеводороды, поверхностно-активные вещества (ПАВ), а также водные растворы гидратов окиси или силикатов щелочных металлов. Применение смеси растворителей с различной молекулярной структурой основано на различном характере растворимости асфальтено-смолистых и парафиновых веществ. Разработанная технология внедрена на мезозойских скважинах ОАО «Грознефтегаз», что позволило обеспечить безаварийный спуск глубинных приборов для проведения термогидродинамических исследований и значительно увеличить производительность скважин и дополнительно добыть десятки тысяч тонн нефти. The main problems that complicate the operation of deep wells (at a certain stage of development) are low collector properties of formations and deposits in the bottom-hole zone of the formation (PCP) and underground equipment of organic salts, i.e. high-melting asphalteno-resinous substances (ASV). This leads to a significant reduction in oil production, up to the complete termination of the inflow from the formation, makes it difficult, and in some cases completely impossible, to carry out deep thermohydrodynamic studies of wells and measures for impact on the bottom-hole zone of the formation, causes the need for additional costs related to the collection, transportation and preparation of oil, which impairs the technical and economic indicators of development of oil deposits. In order to combat these complications, a large number of technological methods and reagents based on RINGO solvents, inhibitors and solvents of Soyuzneftepromchim Institute (СНПХ-7909, СНПХ-7941, СНПХ-7920М) and others have been developed and used in oil field practice. However, these reagents and process diagrams are designed to treat shallow wells where the bulk of the deposits are paraffin series compounds. Under conditions of deposition of high-malecular ACB, they are ineffective or unacceptable. In this regard, for conditions of deep high-temperature asphalt-resin- forming wells special technologies of treatment of PIP and tubing have been developed. The technology involves the use of compositions comprising aromatic and marginal hydrocarbons, surfactants and aqueous solutions of alkali metal hydroxide or silicate to remove and inhibit ACB deposits. The use of a mixture of solvents with different molecular structures is based on the different solubility of asphalteno- resinous and paraffinic substances. The developed technology was introduced at the Mesozoic wells of OAO Grozneftegas, which allowed to ensure the accident-free descent of deep instruments for thermohydrodynamic research and significantly increase the productivity of wells and additionally produce tens of thousands of tons of oil.


2019 ◽  
pp. 30-38
Author(s):  
Rasul M. Aliyev ◽  
Shamil M. Kurbanov ◽  
Temirlan M. Umariev

The issue of vertical wells curvature is important, especially when conducting wells in complex geological conditions of drilling, due to the increasing depth of the wells and the corresponding rise in the cost of drilling. The cause of this circumstance lies in the large time and financial costs while flattening of the bent wells. Moreover, it should be noted that during the subsequent drilling of a curved well the risk of key-seating and the corresponding complications increases. That is why large oil field service companies and drilling enterprises are paying more and more attention to solving the problem of vertical wells curvature. This article is devoted to investigation the effect of rotation of the drill string on the deflecting force on the bit while drilling a vertical well in a rotary way. We suggest using of eccentric drill collars for drilling vertical wells in difficult geological conditions. Also, we create an expression for the dynamic milling force on the bit, taking into account the usage of an eccentric drill collar in the composition of bottom-hole assembly.


Author(s):  
Patti Haskins ◽  
Mark Walters ◽  
S. Elieen Goldborer

The Tom Moore site (41PN149) is situated on the east slope of a circular-shaped landform at the highest point of a steeply-sloping upland in the Irons Bayou valley in Panola County, Texas. Irons Bayou, 1.2 km to the west of the site, flows east to its confluence with the Sabine River. A small tributary of Irons Bayou is 600 m to the south. Soils here are a brown sandy loam overlying a very hard red clay B-horizon. Like most of East Texas, the land has been farmed previously, as indicated by old plow furrows, and it has reforested naturally in pine and mixed hardwoods in the last 30 years. The site's upland setting is similar to other Middle Caddoan sites in the Sabine River basin in East Texas. An oil field employee, J. W. Golden of Kilgore, Texas, located the Tom Moore site. He noticed a cache of seven large celts that had been disturbed by construction equipment preparing a well site. The oil well construction consisted of two wells and three associated storage tanks. Approximately 2 acres had been disturbed during the leveling process, and part of the hill was used to form the level well pad. A cultural resources management survey had not been required by the Railroad Commission of Texas prior to construction. Mr. Golden described the celts as occurring in a group with the blade ends up. The heavy equipment had grazed them and caused some damage. He collected the celts and informed the authors. We visited the site, made a surface collection, noted a midden area at one end of the disturbance, and collected soil samples for flotation (these materials were submitted to S. Eileen Goldborer of Paleoethnobotanical Services, Austin, Texas) as well as OCR dates. No testing was conducted by the authors to determine the extent of the site. A small, circular mound is located in the wooded area adjacent to the well pad.


2021 ◽  
Vol 3 (3) ◽  
pp. 3-10
Author(s):  
B. H. Nugmanov

One of the ways to increase well oil production is to reduce the filtration resistance of the bottom-hole zone. Along with well-known stimulation methods, such as modern methods of treating wells bottom-hole zone, side tracking (drilling of lateral horizontal boreholes) is of great interest. The following works have been implemented Kalamkas field: a complex of geological, geophysical and field exploration; correlation schemes to track the lithology of the formation; clarifying structural maps and engineering maps; justifying activities to select one or more wells for horizontal drilling; hydrodynamic calculations and estimating their flow rate.


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