FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
THE PATENTS RULES, 2003
Provisional/ Complete specification
[See section 10 and rule 13]
1. Title of invention:
Fiber Reinforced Plastic Fencing System.
2. Applicant(s):
Name Nationality Address
Oil and Natural Gas India IEOT, ONGC Complex, Phase -II,
Corporation Ltd. Panvel -410221, Navi Mumbai,
Maharashtra, India.
3. Preamble to the description:
The following specification particularly describes the invention and the manner in which it is to be performed.

FIBER REINFORCED PLASTIC FENCING SYSTEM
BACKGROUND
Well head areas in the oil and gas industries are generally protected by metal barbed wire fencing. The metallic barbed wire fencing is prone to damage by corrosion, especially in the coastal areas. As a result, the fencing requires frequent maintenance and replacement. As the well heads are typically located at remote and far off places, the barbed wire fencings can often get stolen due to their high scrap value, thereby leaving the well head area unprotected. As a result, the well head area becomes vulnerable to encroachment and damage from unscrupulous elements, thus leaving the well owner to recur high expenses on fencing of the well head areas.
In order to overcome the above-mentioned problems and to thereby provide a cost-effective and efficient alternative to the problems, there is a need to provide an improved fencing system for the protection of well head areas of onshore assets.
SUMMARY OF THE INVENTION
The present invention provides a fencing system of fibre reinforced plastic (FRP) composite material for protection of reservoirs, particularly for well head areas on onshore sites. The fiber reinforced plastic (FRP) fencing system is corrosion-free and does not require any expenditure in terms of periodic maintenance costs. The FRP fencing system is collapsible and can be reused. No painting is required, as the FRP fencing system can be made in the desired color at the time of manufacturing, with the additional incorporation of UV protective compounds for inhibiting damage and discoloration. The FRP fencing system of the present invention provides a long service life of up to 25 years, thereby providing a very cost-effective option to the traditional metallic/barbed wire fencings.
Further, the erection of the FRP fencing system is easy, quick and less labor intensive because of the light weight. Also, the fencing system possesses a high strength to

weight ratio. The fencing system does not require any heavy machinery during the erection and does not involve any hot job such as welding. Additionally, the fencing system provides better aesthetics to the well head areas.
The design of the FRP fencing system is adapted to meet the robustness required for their performance in the field and provide safety to the well head areas at onshore sites. The design of the FRP fencing system provides adequate tensile strength and stiffness to prevent horizontal deflection. Also, the FRP fencing system provides a solution to the issue of security of the well head areas usually suffered at onshore assets due to theft and pilferage of the metallic barbed wire fencing. This is because, unlike the conventional metallic barbed wire fencing, the FRP fencing system does not have any scrap value and are, therefore, free from the problem of pilferage & theft.
These and other benefits of the FRP fencing system will be more apparent from the following description when read in conjunction with the accompanying drawings, which are not intended to limit the scope of the invention.
The present invention discloses a fiberglass reinforced plastic fencing system for protecting an onshore reservoir, said system comprising:
(i) a plurality of fiberglass vertical posts having a rectangular cross-section, said
plurality of fiberglass vertical posts being embedded in concrete footings positioned
below ground level;
(ii) a plurality of fiberglass horizontal channel sections connected to said vertical
posts by stainless steel fasteners at regular intervals;
(iii) a plurality of fiberglass supporting members connected to said horizontal channel
sections by stainless steel fasteners at regular intervals, and
(iv) a plurality of fiberglass inclined sections connected to a top-side of said vertical
posts by stainless steel fasteners, said inclined sections having adequate tensile
strength and stiffness to prevent any horizontal deflection.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The present invention will now be described with reference to the accompanying
drawings, in which,
FIGURE 1 illustrates a schematic view of the fencing system; and FIGURE 2 illustrates a schematic of a front elevation of the fencing system.
DETAILED DESCRIPTION
The fencing system of the present invention is particularly suitable for fencing oil field well head areas at onshore locations. The fencing system is made of glass reinforcement fibers which are embedded in a resin system. The fencing system comprises a plurality of FRP pultruded vertical posts having a rectangular cross-section which are embedded in cement concrete footings positioned below ground level, The consecutive vertical posts are connected with horizontal channel sections by means of stainless steel fasteners. A plurality of fiberglass inclined sections are connected to a top-side of the vertical posts at every 3 meter distance by stainless steel fasteners on the inside of the fencing which prevent any horizontal deflection in the fencing system. The fencing system further comprises supporting members connected to the horizontal channel sections by stainless steel fasteners to provide support. The dimensions and thicknesses of the different components must be optimized so that the FRP fencing has sufficient strength and sturdiness for providing adequate security to the oil field well head areas.
The FRP pultruded profiles used for fencing are made of polyester resin of fire smoke & toxicity grade. Further the pultruded profiles are fire retardant and meet fire retardance requirements as per international standards such as BS 476 or ASTM E-84. Polyester resin is chosen as the resin for the components because besides being the most economical it also provides adequate corrosion resistance. UV inhibitors can be used during the manufacturing of the resin or surface veil can be used to protect from the

effects of ultraviolet radiations to avoid weathering effects and discoloration. The reinforcement used in the fabrication of the pultruded profiles is typically corrosion resistant E-glass reinforcement in the form of rovings and continuous filament mats. The glass content in the FRP profiles must not be greater than 50%.
FIGURE 1 of the accompanying drawings illustrates a schematic view of the fencing system of the present invention. The main vertical posts (10) comprising inclined sections (16) of 75 x 50 mm section of wall thickness 5 mm at spacing of 1000 mm center to center of height 1800 mm above ground level embedded in foundation concrete block of 300 x 300 x 600 mm3, intermediate vertical supporting members (14) of 50 x 50 mm section square post of wall thickness 3 mm @ 1000 mm center to center of height 1800 mm above Ground Level, and horizontal channel sections 100 x 25 mm C-section of 5 mm thickness - 7 nos. of panels at a distance of 160 mm each, are shown.
FIGURE 2 of the accompanying drawings illustrates front elevation (20) of the fencing system showing the vertical posts (10), the inclined sections (16) and the horizontal channel sections (12).
Table 1: Details of a preferred embodiment of the FRP fencing system for well head areas

SI No Component Details of Component
1 Main Vertical Posts of 75 x 50 mm Section of wall thickness 5 mm at spacing of
height 1800 mm above Ground Level 1000 mm center to center.
2 Intermediate Vertical 50 x 50 mm Section square post of wall thickness 3 mm at
support members of height 1800 mm above Ground Level 1000 mm center to center
3 Horizontal Channel 100 x 25 mm C-Section of 5 mm thickness - 7 nos. of panels
Sections with distance of 160 mm between consecutive panels
4 Inclined Support Sections Angle Section 50 x 50 mm of thickness 5 mm at spacing of
of height 1600 mm above Ground Level 3000 mm on Main Vertical posts
5 Fasteners Stainless Steel Rivets of grade 316
6 Foundation Each post and cross support to be embedded in Cement
Concrete block of 300 x 300 x 600 mm3

A typical process for erecting the fencing system is as follows: excavating the ground measuring 300 x 300 x 600 mm at consecutive center to center distance of 1000 mm to obtain a footing; partially filling the footing with cement concrete of mix 1:4:8 up to 15mm from the bottom of the pit; placing the vertical posts having rectangular section ( 75 x 50 mm) of height 2250 mm on top of the CC 1:4:8 at the center of the footing; completing filling the footing with CC 1:2:4 such that the clear height of 1800 mm is available above the ground level; hardening the CC; connecting the horizontal sections of c- section (100 x 25 mm) to the vertical posts at the top and the bottom followed by the intermediate horizontal members with stainless steel fasteners; fixing of the alternate vertical supporting members having square section (50 x 50mm) midway between successive vertical posts; and connecting the inclined sections (50 x 50 mm) to the alternate vertical posts with stainless fasteners at the top-side by grouting in the CC footing.

WE CLAIM
1. A fiberglass reinforced plastic fencing system for protecting an onshore reservoir, said system comprising:
(i) a plurality of fiberglass vertical posts having a rectangular cross-section, said plurality of fiberglass vertical posts being embedded in concrete footings positioned below ground level;
(ii) a plurality of fiberglass horizontal channel sections connected to said vertical posts by stainless steel fasteners at regular intervals;
(iii) a plurality of fiberglass supporting members connected to said horizontal channel sections by stainless steel fasteners at regular intervals, and (iv) a plurality of fiberglass inclined sections connected to a top-side of said vertical posts by stainless steel fasteners, said inclined sections having adequate tensile strength and stiffness to prevent any horizontal deflection.