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Exploration and production drilling

Exploration and production drilling

on technology, mining and geological features of the wiring holes unsealed section of the West Siberian Plain is divided into two parts:

- terrigenous sedimentary rocks cover plate (0 - 3000 m or more)

- dislocated formation of the folded basement provided terrigenous-carbonate, carbonate, volcanic, igneous rocks
Drilling-2

The reasons that lead to complicationsat the opening of cavernous-fractured basement bodies

- presence of absorbing zones in carbonate rocks of Paleozoic;

- non-conformity of design decisions mining and geological conditions

Technology of opening of the Paleozoic deposits field

The method of drilling - a turbo-rotor.

Coring - rotary core turbodolotami KTD-4, KTD-4M, KTD/4C with diamond crowns MKT-188/48, MCR-187/40 burgolovkami 2VM and SCC-190, rotor bits 1VK-190 PT-190 2VK SCC;

« Nedra »with burgolovkoy 17NK 188/80 MS.

Coring in plastic tubes.

The construction of wells bush

-directione 324 mm lowered into the well to a depth of 60 m to prevent erosion and collapse of rock around the mouth of the drilling jig under the direction of cemented;
-conductor 245 mm overlap to a depth of 810 m the upper part of the geological section, where there are unstable rocks of the Paleogene - Upper age that are prone to obvaloobrazovaniyu and absorption of drilling fluid. Conductor layers overlap, saturated with fresh water. The conductor is cemented to the mouth (tsem. solution density of 1.86 g /cm3 in the range of 810-660 m and cement. Solution density of 1.42 g/cm3 in the range 0-660 m)

-Operation Column178 mm lowered into the well to a depth of 3,000 m (up to the roof of Paleozoic sediments) is used for growing open-hole cover and terrigenous placement of underground equipment for the extraction of reservoir fluid. The column is cemented to a depth of 660 m (tsem. solution density 1.86 g/cm3 in the range of 3000-2800 m and cement. Solution density of 1.42 g/in the range 2800-660 cm 3 m);

-'shank' 127 mm down in the interval 2900-3250 m and cemented the entire length of cement slurry with a specific gravity of 1.86 g/cm3

trouble-free opening of the Paleozoic carbonate formations for the purpose of geological exploration and exploitation that they contain hydrocarbon deposits is only possible if the overlap casing terrigenous sedimentary rocks cover.

Coring and test objects

coring to a special rock cutting tools (AT) - drill head and kernopriemnye devices plastoispytatel CAI-2M-146
Kern boxes

in the selection of the core is mainly used rotary drilling method

open-hole tests were conducted using plastoispytatelya CAI-2M-146

Testing was carried out as well in the drilling process using sets of equipment to be tested in open hole - CAI-146, and in the production string at the end of drilling and casing the borehole, while we measured depth gauges to record the hydrodynamic characteristics of the test interval .

Excitation of wells by replacing the mud on the process water with a subsequent call flow of formation fluids reduced the water level in the well or compressor swabbing.

test in open hole

For the test objects used in open hole

1) vehicles, lowered into the well on drill pipes (CAI-146);

2) vehicles, lowered into the well on wireline (OPT-7-10-AIPD GDK);

Tests are accompanied by well testing and sampling.

Hydrodynamic studies of wells (well testing) - a collection of different activities aimed at measuring the parameters: pressure, temperature, liquid level, volume of fluid flow, etc.

Test the recovery in cased holes

Methods for the secondary formation exposing

baring of the conditions of repression.

baring of depression or equilibrium in the reservoir.

Test the recovery in cased holes

Types of perforation:

cumulative

boring

bullet

slot

hydromechanical

gidropeskostruynaya

Performance criteria of the secondary opening of productive layers of cased-hole

  • The total surface opening of the casing must be maximum
    (column should retain the ability to resist the horizontal component of ground pressure)
  • productive part of the reservoir must be opened to a depth of
    provides a face to overcome the polluted area of ​​the reservoir. (Outside the range of opening should be provided with safety casing and cement sheath)
  • Within the reservoir to be created given the number
    perforating channels that provide a perfect hydrodynamic relationship
    reservoir and wells with a minimum hydraulic resistance to flow
    fluid.

Methods of intensification

Additional oil flow in wells is achieved by using methods of increasing the permeability of the layer zones.

Physical Methods designed to remove from the well bottom zone of residual water and solid fine particles, which increases the permeability of oil.

Thermal methods effects are used to remove from the walls of the pore canals of wax and resins, as well as intensification of chemical processing methods bottom-hole zones.

Chemical Methods effect to give good results in impermeable carbonate reservoirs.

The most commonly used chemical methods
RMS (hydrochloric acid treatment) and
T-bills (clay-acid treatment), using solutions of surfactants (surface active agents)

 

Warning acquisitions

Methods

Methods

Tools

 

 

 

regulation of hydraulic resistance in the well-layer

Reducing the hydraulic pressure in the well

Light washing liquids

Water;
Solutions of petroleum-based;
Solutions of the reduced solids content;
aerated liquid.

A slow descent drilling tool

Reducing the fluid into the well

Increasing the gap between the drilling tool and the borehole wall

Increased hydrostatic pressure in the well

topping drilling fluid into the well

Delayed recovery of drilling tools

 

Regulation of the rheological properties of drilling fluids

Go to the drilling fluids flushing with structured

Clay solutions

Chalky solutions

Solutions based on drill cuttings

Chemical treatment of drilling fluids

Reagents - builders

Clogging of channels absorption simultaneously with the opening of

The use of fillers

all kinds of fillers, dispersed phase drilling fluids

Combined Methods

Chemical treatment of aerated liquids

Chemically treated aerated solutions

Chemical processing solutions with low solids content

solutions with low solids content, processed builders

 

Vozduhosoderzhaschie fillers (plamilon, etc.)

catastrophic absorption may prevent using

application of the technique of drilling the casing

technology for drilling-depression
(reduction of hydrostatic pressure on the layer)

application naddolotnyh ejector pumps EZHG
(reduction of hydrostatic pressure on the layer)

application of various compositions and the compositions of washing fluid
(insulation fillers fracture zones that may be
removed in the course of development wells)

Classification of GIS techniques

Classification of GIS techniques
  • Method of SS
  • Method of COP (standard and Concert Hall)
    Induction logging
  • Side Logging
  • microlog survey
  • Gamma ray logging
  • gamma-gamma density logging
  • Neutron logging
  • sonic
  • Nuclear magnetic logging.
technical inspection

well survey

caliper

Thermometry

resistivity

Measurement of azimuth and zenith angle of the hole

Measuring the diameter of the hole

Measurement of reservoir temperature

Resistance of mud

Well logging, problem:

Well logging, task

Geological

study of the composition and properties of rocks in wells (lithological composition of the rocks, dismemberment and correlation of the sections, the selection and evaluation of reservoirs, reservoir definition, the definition of flyuidokontaktov)

Product

study of the technical condition of wells (the spatial position and profile of the barrel, reservoir temperature, the electrical resistance of the mud)

Methods of GIS, as required by regulations, provide highly accurate determination of absolute (0.1% or 2-4m) and

relative depths boundary layers (0.5-1.0m),

detail of the dismemberment of the section from 0.5 to 0.3m.

Nuclear Geophysical Methods of GIS

Nuclear Geophysical Methods of GIS

Determination of the neutron porosity log data

Determination of the neutron porosity log data

sonic

sonic

lithological division of carbonate reservoirs

on GIS data layers in determining the origin of carbonate reservoirs in different lithotypes solve a system of linear equations for the total porosity, saturation, volume content:

dolomite, limestone, kaolinite,

or kaolinite, quartz, bauxite,

or siderite, gibbsite, diaspora,

depending on the specific lithology of breed; within the parameters of drilling fluid and formation water.

Determination of the porosity is carried out according to the NC, AK, and GGK-P, taking into account the bulk clay according to the Civil Code. In the absence of at least one method of porosity lithological division of the cut should be considered estimates.

lithological division of carbonate reservoirs

complex GIS environment for carbonate reservoirs by drilling on conducting
drilling fluids, water-based, including saline

Quantifying reservoir properties of fractured carbonate reservoirs (Kpob, Kpef CRC) -
PS, DC, SC, NC, GGK-P, AK (broadband);

Determination of resistivity of reservoir to quantify AMG - Concert Hall, IR, BC, MBC, VIKIZ;

Determination of the spatial position of the hole - well survey.

Integration of acoustic scanning method (AC-Scan, Scan-EC)
with the methods of lithology and reservoir properties (SGK, 3NNK+INOC-A, AA and GGK-P YAMK), in conditions
mostly fractured carbonate reservoirs.

complex GIS environment for carbonate reservoir during the drilling of oil-based

Quantifying reservoir properties of carbonate reservoirs (Kpob, Kpef CRC) - NC, GGK-P, AK YAMK, INOC;

- Determination of resistivity of the formation, the radial electric characteristics to quantify AMG - VIKIZ, IR;

- Determination of the spatial position of the hole - well survey.

Integration of methods for lithology and reservoir properties (HA 3NNK+INOC-A, AA and GGK-P), in the whole range of geological
conditions of carbonate fractured porous-cavernous reservoirs, including the seal off.

Nuclear magnetic logging

Nuclear magnetic logging

(with the downhole toolMR Explorer ):

-Reduces the error log data interpretation standard open hole through the exact determination of hydrocarbons;

-Provides information about the permeability;

-Provides additional valuable information on reservoir productivity

Powered by the method of magnetic resonance imaging for research in uncased wells

-Allows you to record in any well from 6 to 14 inches

without reducing the logging speed

Branch of the deviceMR Explorer
-instead of the radial recording device records the data in the sector at an angle of approximately 120 ° from one side of the hole Branch of the deviceMR Explorer

BenefitsMR Explorer:

Research in saline drilling fluid, the device records the full echo signals and complex signals type recognition of hydrocarbons in any drilling fluids, regardless of their conductivity.

Allows you to receive the data of nuclear magnetic resonance at higher recording rates in saline solutions, in contrast to previous generation devices.

The opportunity to work in deviated wells.

BenefitsMR Explorer

acoustic scannerSonic Scanner SS

An example of the relationship of permeability to viscosity

acoustic scannerSonic Scanner  SS An example of the relationship of permeability to viscosity

Separation and estimation of intervals open fracture

Separation and estimation of intervals open fracture

UBI - a high-resolution ultrasonic borehole imager

 

Applications

  • Identification and classification of fractures of both natural and man-made.
  • Determination of open and healed fractures (greater credibility to recommend to other types of komleksirovat mikroimidzherov (FMI).
  • Stress Analysis and evaluation of the stability of the trunk.
  • A quantitative analysis of elements of bed and cracks opened by the well.
UBI - a high-resolution ultrasonic borehole imager

interpreting the information,
can be defined:

- presence and effective power intervals, with secondary porosity;
- value of the density of fractures (number of cracks per unit volume of rock);
- density of open fractures (not 'healed' calcite);
- availability of mobile fluid, and in favorable cases, and the nature of saturation.

Ultrasonic borehole scannerUBI

Allocation of fracture

Allocation of fracture zones Allocation of fracture zones

Main results of work performed

  • collected materials on the results of laboratory tests and methods of studying core samples from a selected range of Paleozoic carbonate.
  • tablets were compiled interpretation of GIS data with information about the test results of laboratory studies of the core.
  • Methods of CDP seismic field work 2D,3D, SEISMIC PROFILING, are published exclusive techniques of field work, processing and interpretation of seismic data.
  • A review of the results of non-seismic studies (gravity magneto-electric prospecting), made within Urman Archinskoye-zone.
  • contains information on exploration drilling, coring and testing facilities.
  • Data on the resource assessment study area.
  • Done prediction of the geological section is defined distribution areas looking to shock.
  • The recommendations of optimal directions of studies on the Paleozoic carbonate.

Recommendations

  • - drilled in structurally erosional inlier with the projected development of reservoir rocks;
    Application of high-tech drilling, coring the most complete, high-quality test objects;
    On the motion of fluid flows, the size and the relationship of individual traps may give information to analyze trends passage of chemical markers between wells;
    - conduct a full informative set of GIS (with the assistance of the EC-scanning techniques, the AK-scan 3-dimensional acoustic sounding);
  • extension of the lithologic-petrographic and lithofacies study of the core by means of electron microscopy, X-ray microprobe, microtomography; Comparison of results of core analysis with GIS data;
  • - mandatory use of paleontological methods of correlation and subdivision of sections of wells from the core;
  • - generalization of results of core analysis and GIS, the creation of detailed diagrams and cuts paleofatsialnyh sediment pre-Jurassic deposits;
  • - CDP-performance 3D seismic survey. Vysokorazreshennogo For high-quality material in the range of Paleozoic rocks to use polygonal 3D orthogonal systems with a uniform step in Station and Shot equal to 50 m; with the same distance between the receiving and explosive lines, equal to 300 m ; with simultaneous recording of at least 1200 channels. The system should provide a multiplicity of observations not less than 60 when the size of a bean 25*25m and reach polnoazimutalnogo bean filling with a uniform distribution Deletion;
    processing of seismic data to the use of modern manufacturing systems (OMEGA, PRIME, FOCUS);
    interpretation of the seismic data should be based on the use of complex techniques to complement seismic studies, the mandatory use ofAVO-attribute seismic inversion, the use of multivariate statistical analysis in selecting the optimum correlations that determine the distribution of reservoir properties;
    - application of new technologies seismic, after further discussion of the features and benefits.