Dense oil well carbon dioxide front energy storage composite sand adding fracturing method

A carbon dioxide and sand-added fracturing technology, which is applied in earthwork drilling, wellbore/well components, and production fluids, can solve problems such as low fracture conductivity, poor fracture-making ability, and difficult-to-seal sand-mixing devices. Overcome the dependence on special airtight equipment, enhance the driving pressure and fluidity, and overcome the limited effect of energy-enhancing effect

Inactive Publication Date: 2018-05-18
北京百利时能源技术股份有限公司
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Problems solved by technology

However, pure carbon dioxide fracturing also faces the following problems: first, carbon dioxide has high frictional resistance, low viscosity, and relatively poor fracture creation ability, which easily leads to insufficient fracture space; second, low viscosity of carbon dioxide leads to poor sand suspensio

Method used

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  • Dense oil well carbon dioxide front energy storage composite sand adding fracturing method
  • Dense oil well carbon dioxide front energy storage composite sand adding fracturing method
  • Dense oil well carbon dioxide front energy storage composite sand adding fracturing method

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Embodiment Construction

[0027] Such as figure 1 , figure 2 As shown, the carbon dioxide pre-energy storage composite sand fracturing method for tight oil wells of the present invention comprises the following steps:

[0028] ⑴ Prepare the corresponding construction equipment and well entry materials according to the design, specifically, prepare liquid carbon dioxide, slick water, carbon dioxide drag reducer, cross-linked fracturing fluid, and fracturing proppant on site, and then connect the surface process and conduct a pressure test on the surface process , the unqualified pressure test needs to be rectified, and the next step will be entered after the pressure test is passed again.

[0029] Specifically, the surface process includes a carbon dioxide fracturing pump truck 2 arranged at the wellhead 1 for pumping liquid carbon dioxide and a conventional fracturing pump truck 3 for pumping slick water, cross-linked fracturing fluid, and fracturing proppant , a carbon dioxide booster pump 22 is co...

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Abstract

The invention discloses a dense oil well carbon dioxide front energy storage composite sand adding fracturing method. The dense oil well carbon dioxide front energy storage composite sand adding fracturing method comprises the following steps that (1) a ground surface flow is connected, and pressure testing is conducted on the ground surface flow; (2) liquid carbon dioxide is subjected to pump injecting, and circulating cooling is conducted on the ground surface flow; (3) pump injection construction is conducted on a mixture of slickwater and the liquid carbon dioxide, a pure liquid carbon dioxide, cross-linked fracturing fluid and cross-linked fracturing fluid with sand in sequence; (4) fracturing liquid flowback is conducted; (5) well shut-in is conducted; and (6) blowout testing is conducted. According to the dense oil well carbon dioxide front energy storage composite sand adding fracturing method, the liquid carbon dioxide is combined with the conventional fracturing liquid whilea construction requirement for dense oil fracturing transformation is met and the construction safety is guaranteed, the productivity effect after pressure is effectively improved, and the target of afracturing technology is achieved.

Description

technical field [0001] The invention relates to a method or equipment for extracting oil, gas, water, soluble or meltable substances or mineral mud from wells by forming cracks or fractures, in particular to a carbon dioxide pre-storage composite sand fracturing method for tight oil wells. Background technique [0002] my country has abundant tight oil resource reserves, but due to tight reservoirs and low natural production capacity, it is necessary to release the production capacity of oil wells through fracturing and obtain industrial production. However, conventional large-scale water-based fracturing, temporary plugging diversion fracturing and other technologies have not achieved obvious results in fracturing and stimulation of tight oil wells. damage, difficulty in flowback of fracturing fluids, and insufficient crude oil flow capacity underground. [0003] Compared with conventional water-based fracturing technology, carbon dioxide fracturing technology has the foll...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 宋博杨锡勇李鲁兵李常兴胡丰旭赵海涛韩新宇李中锋张庆军
Owner 北京百利时能源技术股份有限公司
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