Density proppant improve fracture conductivity

Presented findings water fracturing fluid density ceramic proppant suppliers  To investigate this new fracturing fluid proppant carrying capacity and the ability to completely fill proppant problem generating cracks. Studies have shown a conventional proppant pack, which can only generate a fracture cross section of the hydraulic fracture stimulation pack, while the use of a low density proppant, can fracture length and high slit cracks can be further extended. So far, in the Permian Basin of west Texas, has been the application of this new technology was patented 130 times fracturing treatment, this new technology is mainly used an artificial low-density material called LiteProp

Fracturing proppant rent limit and computer program selection

The ability of fracturing proppant properties and diversion in the geological and engineering conditions under given, fracturing design personnel must master the different types, different diameter proppant properties and leased limit.

  Combined with the geological conditions of a given (closure pressure, rock hardness, temperature and fracturing objective layer compound etc.), use the existing engineering conditions (nature,hydraulic fracture stimulation , fracturing fluid infusion equipment) can be safely pump, after pressing can obtain higher and stable yield of primipara proppant.

  Selection of proppant computer program including, total economic standard. The net present value calculation; hydraulic fracture stimulation , production technology and economic feasibility of the model input data, the volume and the proppant weight and other factors.

Fracture mining technology

Fracturing technology by injecting sand, water and chemicals into wells, the formation of cracks in the shale formation and extraction of natural gas. Due to the level of drilling technique, the changes in mining techniques for the development of non productive deep shale formations over the past ten years, conventional,unconventional natural gas and two other forms of (tight gas, CBM) along with the increase of 30%-40% of domestic energy production.

But some people think that the energy gain is costly, and France, the United States of New Jersey and New York, due to the environmental impact of worry, has banned takefracturing technology of hydraulic mining.

In the numerous of mining process view, there is a thought that this will pollute thegroundwater, caused by the earthquake, causing chemicals such as methane andbenzene leak into the air. So far, oil and gas regulators and other groundwater protection experts also found no sign that is directly linked to the China proppant and groundwater pollution, but also did not conduct a comprehensive research on this technology.

Civil and Environmental Engineering Department of University of Texas-Austinprofessor Danny Reible recently by virtue of its groundwater expertise in helping the U. S. environmental protection agency to study the Fracturing proppants , he thought that the occurrence of pollution may be due to poor drilling design and construction or waste management surface bad.

Method of limiting layer fracturing

To pressure for multilayer and each layer has different rupture pressure wells. Thenumber and diameter of control of each layer perforation, and as far as possible to improve the injection rate, using the first frac sand perforation friction layer improve the bottom hole pressure and achieve a divider multilayer purpose.

A, B and C three reservoir, fracturing pressure respectively 24, 20 and 22MPa,according to the respective eyelet perforation scheme launched. When injected into the bottom hole pressure is 20 MPa, B laminated open; and then enhance the displacement, due to perforation friction is proportional to the displacement, B layerperforation friction reached 2 MPa injected into the bottom hole pressure is 22 MPa,namely the C layer is pressed; continue to improve the displacement, B layerperforation friction reaches 4MPa at the bottom of the hole injection the pressure is 24 MPa, the A layer is pressed to open. Perforation of the effect is similar to thedownhole throttling device, with a Ceramic proppants displacement increase, the bottom hole pressurecontinues to improve, and then laminated open.

Limit the key flow method of layered fracturing perforating fracturing is to plan according to the requirements of reasonable design, including perforation, hole density and pore size, so that the completion and fracturing to form a unified whole.

Fracture Heightgrowth controlling technique

When the oil and gas layer is very thin or middle layer and the shielding layer between the minimum horizontal main pressure difference is small, the crack pressure height to easily enter the shielding layer, when the need to control the natural gas fracturing heightextension. Can be realized by controlling the Proppant fluid performance parameters and construction displacement, the more reliable is the artificial interlayer fracture Heightgrowth controlling technique.

The basic principle is in the pre adding liquid floating or sinking type guide agent,through the front fluid into the crack, floating guide agent and sink type guiding agentrespectively, floating and sinking gathered at the top and bottom of artificial fracture,low permeability formation compaction artificial barrier, prevent crack pressure upward/ downward propagation, reach the fracture height controlling purpose. In order to make the two guide agent can move up and down, usually in the injection with guiding agent liquid short-term after the pump stops, then the fracturing operation normal.

Artificial interlayer fracture height controlling technology is mainly used to 1) bulkhomogeneous formation production layer and non production layer interbed; 2)production layer and between layers of water gas, good interlayer; 3) production layer and the shielding layer stress difference can not effectively control the cracks ofvertical extension.