CN1508390A

CN1508390A - Solid propping agent for oil-gas well fractrue

Info

Publication number: CN1508390A
Application number: CNA02157202XA
Authority: CN
Inventors: 许宏初; 包小林; 范龙俊
Original assignee: Yixing Dongfang Petroleum Proppant Co Ltd
Current assignee: Yixing Dongfang Petroleum Proppant Co Ltd
Priority date: 2002-12-18
Filing date: 2002-12-18
Publication date: 2004-06-30
Anticipated expiration: 2022-12-18
Also published as: CN1304729C

Abstract

The invention is about to improve the solid ceramic particle proppant of deep oil and gas well fracturing technique, the solid proppant composed of crude bauxitic clay fine powder and 6-10wt% manganese dioxide mineral fine powder. The manganese dioxide reacts with the bauxitic clay main material more completely under high temperature, largely reducing glass phase, and beneficial to raise the compactness of the resultant at the same time, able to largely heighten the guide-flow ability. The solid proppant: bulking density 1.65-1.8g/cu cm, apparent density 3.0-3.15g/cu cm, and breaking resistance (SY/T5108-1997) 86MPa not greater than 10%, the maximum able to reach 100MPa not greater than 10%.

Description

The well fracturing Selid propping agent

Technical field

The present invention relates to a kind of deep-seated oil, gas well fracturing technology Selid propping agent, in particular for than high depth oil gas well solid ceramsite propping agent.

Background technology

Exploitation deep-seated oil, gas well improve output, and fracturing technology is widely adopted.For guaranteeing opening wide of underground deep layer pressure-break, the proper supporting agent is necessary, and it can strengthen the stratum flow conductivity, improves the output of oil or gas, is the important key that fracturing technology is used quality.Sintering ceramsite is owing to the intensity height, and density is moderate, for the preferred pressure-break proppant of people, is paid much attention to always.Be primary raw material wherein, cooperate other inorganic materials, make Selid propping agent, by some producers are used with the bauxite.

Chinese patent 02112746 discloses in a kind of being applicable to dark oil gas well (for example below 4000 meters) and use the haydite Selid propping agent, and it mainly is made up of wrought aluminium alum and kaolin, red soil clay, thereby acquisition has lower density (bulk density 1.5-1.65 gram/cm ³, apparent density 2.65-2.85 gram/cm ³), compressive strength 52Mpa≤7%, flow conductivity 60Mpa 〉=35 μ m ²-cm.Along with the oil gas well mining degree of depth is deepened, oil gas well formation fracture clossing pressure increases thereupon, and permeance property reduces, and fracturing technology requires to have the Selid propping agent of intensity higher (for example compressive strength 69Mpa≤10%), make it to adapt to the instructions for use of advanced oil gas well, improve the proppant permeability.

It is 2.8-3.0g/cm that Chinese patent 89102544 discloses a kind of apparent density ³Middle density proppant, it is to be primary raw material with the poor bauxite of salic 65-75% or aluminium ore leftover bits and pieces, being aided with part soft clay and quartz is auxiliary material, mixed by 100: 15: 10, adopt the preparation of electric smelting blowing process, mainly being mullite is main mutually, and alumina content is 60-70%, and dioxide-containing silica is the Selid propping agent of 23-28%.The main deficiency of this Selid propping agent is: soft clay in the batching and quartz, and good inadequately with aluminium alum major ingredient pyroreaction associativity, easily cause the instability of product quality, quality fluctuation is big; Secondly,, because of containing a certain amount of soft clay and quartz in the raw material, thereby there is higher glassy phase in the product though the product principal crystalline phase is the mullite phase, the incompatible requirement of fracturing technology technology at present, its product reality is not adopted by the oil gas well basically.

Chinese patent 93111983 disclosed a kind of high-strength alumina supporting agents, it is the roasting bauxite with the salic 65-95% of 70-95%, 5-30% is by iron, magnesium, the multiple oxide of manganese and soft clay in collocation, or zircon, soft clay auxiliary material, obtains with α-Al ₂O ₃The diamond spar microstructure is a principal crystalline phase, after many components oxide and the soft clay congruent melting with α-Al ₂O ₃The combination that forms solid solution and glassy phase and form, apparent density≤3.4g/cm ³, bulk density≤2.1g/cm ³Yet this proppant not only needs the wrought aluminium alumina to make raw material, has increased manufacturing cost, and has caused the raising of product density, has improved use cost, has increased the pressure break difficulty.

Desirable well fracturing Selid propping agent, requirement has high carrying capacity and high sand ratio, therefore need alap density and high as far as possible intensity, yet the common proportional relation of ceramsite propping agent intensity and density, people fill a prescription by various effort adjustment for this reason, with the As soon as possible Promising Policy above-mentioned requirements.

Summary of the invention

The objective of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of prescription simple, steady quality has higher-strength and relatively low density, adapts to the clossing pressure height, the deep-seated oil gas well fracturing Selid propping agent that penetrating power is low.

The object of the invention realizes that main the improvement is that Selid propping agent adopts the cast alumin(i)um alumina to make major ingredient, adds the dioxide ore for manganese of 6-10%.Specifically, well fracturing Selid propping agent of the present invention is characterized in that the cast alumin(i)um alumina fine powder by aluminium content 65-75%, and the manganese dioxide mineral fine powder that adds 6-10% (weight) is formed.

Be to coordinate the contradiction of proppant strength (anti-breaking capacity) and density, under the topic, reduce its density as far as possible before guaranteeing working strength, cast alumin(i)um alumina major ingredient of the present invention especially adopts to contain higher () the bauxite ore for example 〉=3% of titanium dioxide.High-load titanium dioxide can improve the intensity and the stability of burning till proppant, and can control the density increase.

Proppant of the present invention is owing to adopt the manganese dioxide mineral add high level in cast alumin(i)um alumina material, and not only raw material type is few, and batching is simple, produces easy to controlly, and can control the raising of density; And manganese dioxide and major ingredient cast alumin(i)um alumina reacted more complete in high temperature, and glassy phase is reduced greatly, and constant product quality helps the product density simultaneously and improves, and can improve flow conductivity by a relatively large margin.Higher titanium dioxide in the cast alumin(i)um alumina mineral has further been controlled the increase of density.In addition, high dioxide ore for manganese material uses and increases also and can reduce the proppant firing temperature, energy conservation not only, but also can control increasing of density.The present invention only on less raising density basis, makes it intensity and improves greatly.It is principal crystalline phase mutually that proppant of the present invention forms with mullite, corundum through calcining, product Al ₂O ₃65-80%, Fe ₂O ₃1.5-6%, SiO ₂10-15%, full manganese 2-5%, bulk density 1.65-1.8 gram/cm ³, apparent density 3.0-3.15 gram/cm ³, anti-breaking capacity (SY/T5108-1997) 86 Mpa≤10% reaches as high as 100 Mpa≤10%, flow conductivity 60Mpa 〉=70 μ m ²-cm, turbidity＜20 degree.

Below in conjunction with two specific embodiment, further specify the present invention.

The specific embodiment

Embodiment 1: get content of titanium dioxide 4.5%, Al ₂O ₃70% cast alumin(i)um alumina 100%, add manganese dioxide mineral 6.5%, respectively two kinds of raw meal are broken into 300 order fine powders, the batch mixing uniform mixing, fill up the required moisture content of granulating and mix humid soil, after granulation, put into water chestnut shape nodulizer and rotate balling-up, screening select the particle of particle diameter 0.5-1mm, send into rotary kiln through 1350 ℃ of 1.5 hours sintering, kiln discharge cooling sorting dedusting packing.

Embodiment 2: as embodiment 1, wherein manganese dioxide adds 10%, 1320 ℃ of 1.5 hours sintering.

The foregoing description burns till the back product and contains Al ₂O ₃68%, Fe ₂O ₃2.5%, SiO ₂12%, full manganese 3.5%, bulk density 1.75 gram/cm ³, apparent density 3.10 gram/cm ³, anti-breaking capacity (SY/T5108-1997) 69 Mpa≤5.2%, flow conductivity 60Mpa 〉=75 μ m ²-cm, turbidity＜20 degree.

Claims

1, a kind of well fracturing Selid propping agent is characterized in that the cast alumin(i)um alumina fine powder by aluminium content 65-75%, and the manganese dioxide mineral fine powder that adds 6-10% (weight) is formed.

2, according to the described well fracturing Selid propping agent of claim 1, it is characterized in that content of titanium dioxide 〉=3% in the said cast alumin(i)um alumina.