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Tip screen-out fracturing method

A fracturing and screenout technology, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve problems such as short stable production period, rapid decline in pressure and production after fracturing, pressure channeling of adjacent wells, etc. , to achieve the effect of simple construction procedure, convenient on-site operation and obvious effect

Active Publication Date: 2020-01-17
克拉玛依科美利化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an end screenout fracturing method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the production stimulation effect of existing oil and gas wells is always not obvious after fracturing; most of them are manifested as poor gas production , Rapid pressure and production decline after fracturing, short stable production period or pressure channeling of adjacent wells

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, the end screenout fracturing method is carried out according to the following steps: the first step, pumping preflush into the fracturing formation; the second step, the length of the main fracture in the fracturing formation reaches the fracturing design target value In the third step, the high-efficiency filtrate reducer is pumped in; the third step is to pump the high-efficiency filtrate reducer and the sand-carrying fluid is pumped in when the pressure increases; in the fourth step, the replacement fluid is injected, the well is shut down for 2 to 6 hours, and then the well is drained. Test oil and gas production; among them: the volume ratio of pumped pre-fluid, high-efficiency fluid loss fluid and sand-carrying fluid is 10 to 100:4 to 70:30 to 300.

[0028] The end screenout fracturing method of the present invention can be divided into the following four stages, which are respectively the end screenout fracturing design stage, the artificial main fra...

Embodiment 2

[0035] Embodiment 2, the end screenout fracturing method is carried out according to the following steps: the first step is to pump the pre-fluid into the fracturing formation; the second step is to reach the fracturing design target value of the main fracture length of the fracturing formation In the third step, the high-efficiency filtrate reducer is pumped in; the third step is to pump the high-efficiency filtrate reducer and the sand-carrying fluid is pumped in when the pressure increases; the fourth step is to inject the replacement fluid, shut down the well for 2 hours or 6 hours, and then open the well to drain the fluid. Test oil and gas production; where: the volume ratio of pumped pre-fluid, high-efficiency fluid loss fluid and sand-carrying fluid is 10 or 100:4 or 70:30 or 300.

Embodiment 3

[0036] Embodiment 3, as the optimization of the foregoing embodiments, the high-efficiency fluid loss fluid contains 0.2% to 0.5% of the guar gum base liquid, 1% to 20% of the fluid loss additive, 1% to 10% of the gel breaker, and Discharge agent 0.2% to 2%, clay stabilizer 0.4% to 1%, and the balance is water; or / and, before pumping the high-efficiency fluid loss fluid, adjust the pH of the high-efficiency fluid loss fluid with sodium hydroxide or sodium carbonate Values ​​are 8.5 to 11. The high-efficiency filtrate reducer is an alkaline liquid after the pH value is adjusted, the viscosity is ≤30mPa.s, and the optimum viscosity is 1mPa.s to 10mPa.s; the expansion factor of the fluid loss reducer at 90°C can reach 10 to 60 times, And can maintain good high strength, salt resistance and stability.

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Abstract

The invention relates to the technical field of fracture acidizing of oil fields, in particular to a tip screen-out fracturing method. The tip screen-out fracturing method comprises the steps that firstly, a prepad fluid is pumped into a fracturing formation; secondly, and when a major fracture of the fracturing formation grows to a target fracturing design value, efficient filtrate-loss reducingliquid is pumped; thirdly, when the efficient filtrate-loss reducing liquid is pumped and pressure is increased, sand-carrying fluid is pumped; and fourthly, displacing liquid is injected, and oil andgas production is tested. According to the tip screen-out fracturing method, when the efficient filtrate-loss reducing liquid is pumped, it is not required to change the construction displacement, the construction procedure is simple, and field operation is facilitated. The efficient filtrate-loss reducing liquid contains a cleanup additive, a clay stabilizer and a gel breaker, the damage of a filtrate to the formation can be reduced, and after five hours, the residual rate of the filtrate-loss reducing liquid is about 30%; compared with the prior art, the fracturing yield of the tip screen-out fracturing method is increased by 80%-160%, and the stable production period after fracturing is prolonged by 2-3 time; and after the method is adopted, the yield-increasing effect obtained after fracturing is obvious, and no phenomenon of near-well pressure channeling occurs.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing and acidizing, and relates to an end screenout fracturing method. Background technique [0002] The tip screenout fracturing technique (TSO) is the best choice for hydraulic fracturing in medium-high permeability reservoirs, conventional low-permeability reservoirs, and infill oil well blocks to obtain high conductivity. The application of TSO fracturing technology proposed by Smith et al. (1984) has brought a revolution to the completion and stimulation technology of low-high permeability reservoirs. [0003] TSO fracturing technology can obtain 97.6kg / m 2 The concentration of proppant laying, which shows that the conductivity can be improved by 10 times to 20 times. Under high stress conditions, the use of artificial proppant (corresponding to quartz sand) can also improve the conductivity of the same, and the combination of the two can increase the conductivity of nearly 100 times...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267C09K8/035C09K8/68C09K8/90
CPCC09K8/035C09K8/685C09K8/905E21B43/26E21B43/267
Inventor 张仲春张瑞李建芳
Owner 克拉玛依科美利化工有限责任公司
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