Solid propping agent and its preparation method

Abstract

The present invention relates to an improvement on solid supporting agent for deep-seated oil ang gas well fracture process, and is characterized by that it adopts kaoline and red mud as clay material, and increases its dose, so that on the premise of ensuring strength it can obviously reduce the apparent density of product, it not only is favorable for carrying construction of fracturing fluid, but also its volume dose is small, and can reduce use cost. Said ivnention adopts rotary kiln rolling dynamic firing process, its product can be uniformly fried, and its fried time is short.

Description

technical field [0001] The invention relates to a solid proppant for deep oil and gas well fracturing technology and a preparation method. Background technique [0002] To develop deep oil and gas wells and increase production, fracturing technology is widely used. In order to ensure the opening of deep underground fracturing fractures, suitable proppant is necessary, which can enhance formation conductivity and increase oil or gas production, and is an important key to the application of fracturing technology. Because of its high strength and moderate density, sintered ceramsite is the preferred proppant for fracturing and has been highly valued. Chinese patent 89102544 discloses a kind of poor bauxite or bauxite leftovers containing 65-75% of alumina as the main raw material, soft clay and quartz as auxiliary raw materials, mixed at 100:15:10, using electric melting The solid proppant is prepared by the injection method, and the obtained is mainly composed of mullite pha...

AI Technical Summary

Problems solved by technology

The main disadvantage of the above-mentioned proppant is: the prepared proppant has a high apparent density, which not only affects the carrying capacity of the fracturing fluid, but also requires a large volume of fractures, and the use cost is relatively high; Bricks are fired, then put into electric arc furnace to melt and blow balls after cooling, the energy consumption is high, and the ball formation is uncontrollable, the yield of products that meet the requirements is low, and proppant that does not meet the requirements is not suitable for reuse, wasting raw materials

The obtained proppant is based on α-Al 2 o 3 The corundum microcrystalline structure is the main crystal phase, and the apparent density is still high at 3.4g / cmu 3 , the semi-dry method produces high turbidity, which affects the diversion capacity; secondly, the stacked static sintering of the box bowl not only has a long firing cycle, high energy consumption, and low production capacity, but also requires a lot of auxiliary materials such as box bowls and kiln cars. The temperature difference between the upper and lower parts is large, the stability of the finished product is poor, and the quality fluctuates greatly.

[0004] The common defect of the proppant prepared by the above two methods is that the apparent density of the product is relatively high, which not only affects the carrying of the pressure fluid, but also causes a large weight in the same volume and high cost of use.

Secondly, the production energy consumption is high, the production capacity is low, and the cost is high