Fracturing proppant selection

The computer program of oil fracturing proppant selection, fracturing design should be a perfect combination of computer simulation and field experience of water support treatment.

  Cost ofhydraulic fracturing proppant and fracturing fluid is composed, fracturing process equipment and installation costs.

  Because the supporting agent cost of the total cost of 1/3~2/3 is a fact. According to the closure stress resistance, from a technical point of view, ( hydraulic fracture stimulation ) proppant selection is not only the key elements of the fracturing design, and from the angle of economy and related to the implementation and efficiency of work.

Oil fracturing proppant roundness and ball high

oil fracturing proppant roundness representing relative sharpness of edges and corners of the sphericity of the particles, refers to the sand and spherical similar degree.

  Determine the roundness and sphericity of commonly used visual method, the general use of photomicrographic technique in 10~0 times under the microscope or photographed, and then compared with a round ball, degree of plate and standard, determine the sand round, sphericity.

  Proppant round, the ball is not good when the sand filling cracks, poor permeability and angular easily broken, crushed little particles formed will plug the pores, reduce its permeability.

The choice of oil fracturing proppant strength standard

The strength of proppant is an important index of its performance. Due to the different composition and production method of proppant, the intensity difference is very big also, such as quartz sand strength 21.035.0Mpa, ceramisite strength can reach 105MPa to crack.

  After hydraulic fracturing, proppant closure pressure effect of cracks in the cracks in the supporting agent, when the intensity ratio of wall rock seam strength, proppant may have embedded formation.

 When the seam wall rock strength than the proppant intensity, and the closed pressure is greater than the intensity of supporting agent supporting agent,
easy to be crushed.

  These two cases will lead to crack closure or permeability is very low. So in order to ensure the flow capacity to fill cracks in the broken, under different close pressures, to all kinds of mesh proppant strength and breaking rate have certain requirements.

Selection of oil fracturing proppant size standard

Uniform particle size, low density.

In general, hydraulic fracturing with proppant size is not single, but a certain range, if the separation degree of the support agent difference, the process of reproduction, blocking flow channel, the influence of sand filling fracture flow conductivity of proppant, so the particle size and the degree of sorting is a certain request.

In the domestic field of commonly used 20/40 mesh support agent as an example, there are at least 90% sand through the sieve after is located in the 20~40 between the eyes, at the same time demand is greater than the first number sieve sand weight is less than 0.1%, but less than the last screen amount cannot be greater than 1%.

The ideal support agent density is small, preferably less than 2000kg/m3, in order to facilitate thecarrying fluid to carry into the fracture.

The choice of meaning of oil fracturing proppant

Hydraulic Fracturing Proppants accounted for the entire cost of 1/3~1/2, not only often represents amost cost of oil and gas well early, but especially decides the economic life of oil and gas wells or oil.

  Fracturing charges too large may be unnecessary waste of the whole capital, whereas the fracturing operation is too small, will be due to lack of reservoir produced fluid, resulting in a well withoutbenefit.

  In the fracturing operation, the fluid in the reservoir gradually discharged, leaving only is proppant propped fractures, to keep the channel open. Provide a high flow capacity of channel, to increase oil and gas flow can flow into the wellbore, keep the reservoir long-term flow capacity.

  Therefore in hydraulic fracturing optimization design, type and size of produced layer supporting agent have significant meaning and key role.

The importance of determining proppant type

Determination of proppant type, particle size and cracks in the middle the concentration (or layers) is an important link in fracturing design, but also the key to guarantee the pressure after production and improving the development level (an increase of oil recovery rate of recoverable reserves increase).

  In general, is the need to obtain the expected effect of fracturing fracture conductivity to select proppant, therefore, in the selection process, cannot do without the condition of reservoir, the engineering conditions (fracturing fluid performance equipment, pumping capacity) indoor test results and the evaluation of proppant.

The fracturing proppant factory request

The manufacturer should continue to improve the production of the whole process of quality monitoring, control, management and security system, to produce more quality products. 

  Exploration and production companies to actively promote the oil company application of quality products, to do not conform to the standard of the enterprise products, will be expelled from the oil fracturing proppant management network, prohibit the application of oil field.

The requirements of oil field

In order to ensure the oil fracturing effect, the requirements of various oil companies must use the oil fracturing proppant products manufacturers and management within the network, and requests the oil oil and gas production departments take the responsibility, management the oil fracturing proppant daily work.

  If the oil found good manufacturers and products in new product trial, should be timely recovery toexploration and production company of technology of gas recovery and recommended requirements manufacturers put forward as soon as possible network applications.

Fracturing proppant quality management checks informed

According to the quality supervision and spot check the quality management of Chinese petroleum natural gas group company and energy conservation department procurement product bulletin, 2009 from 11 oil fracturing proppant selected 32 samples is evaluated as qualified (acid solubility no judgment)