What is control sand?
What is control sand?
1. n. [Well Completions] The installation of equipment or application of techniques to prevent migration of reservoir sand into the wellbore or near-wellbore area. In weak formations, sand control may be necessary to maintain the structure of the reservoir around the wellbore.
How is sand production controlled?
The Gravel pack controls sand production by placing filters of gravel grains that keep the sand grains in the filter. The optimal size of the gravel is proportional to the size of the grains in the sand. The Gravel pack is typically coiled and can be placed in wells with wall pipes or open wells.
Why do we need sand-control?
Sand production can lead to several issues such as production impairment due to sand plugging, erosion to completion string and down hole tool, damage surface facilities as separator, piping, etc.
How is sand content controlled?
Gravel packing is currently the most widely used sand-control technique for completing wells. More than 90% of all sand-control completions are gravel packs. Because of its flexibility, almost any well at any deviation can be gravel packed.
What is sand production?
Sand production occurs when the stress on the formation exceeds the formation strength and result in rock failure. Rock failure happens due to tectonic activities, overburden pressure, pore pressure, stress induced during drilling and also producing fluid drag force [2].
What is sand exclusion?
Sand exclusion is a more widely used type of sand control method due to its ability to act as a mechanical barrier to the sand production. It is important to take into account of the type of well and its completion in order to successfully design the sand control methodology.
Why do we need sand control?
What causes sand production?
The internal causes of sand production from the reservoir are the stress state of borehole wall rock and the tensile strength of rock (affected chiefly by consolidation strength of rock), whereas external causes are the producing pressure drawdown value and the change in reservoir fluid pressure.
What is sand influx in oil wells?
“Sand Influx Control” during production of Oil & Gas Oil and gas is usually trapped in porous rock composed of sandstone or Limestone. Many of the sandstone formations are poorly consolidated which leads to the production or incursion of sand and fines particles along with oil or gas.
Why sand production is considered in designing the well completion?
Sand production is an important challenge in upstream oil and gas industry, causing operational and safety problems. Therefore before drilling the wells, it is essential to predict and evaluate sanding onset of the wells with the intention of drilling trajectory optimization.