1 Introduction
Tahe Oilfield Ordovician reservoir of cracks, caves carbonate reservoirs, reservoir type very special, reservoir permeability space varied shapes, size and the poor, uneven distribution, with a strong heterogeneity. The drilling process may have varying degrees of venting, leakage and leakage great chance unequal speed, column group under completion process needs time to cement grouting, preventing well fluid from the drain turn overflow, severe form of kick blowout, causing the risk of well control . The live set just need to leave before completion string double preventer, high pressure cement grouting hose directly inserted in the double ram were up pulp column in the group during the frequent shaking and cement grouting hose bump, causing pipeline Hammer Uniom head Drop into the well, from the lower column Difficult sticking phenomenon occurs, causing heavy construction accident. Secondly, during the on-site during cement grouting, cement grouting before the need to cement grouting hose into the inner double ram, double ram need to pull out from the end, making the cement grouting under completion string and group processes influence each other, but cement grouting soft tube frequent disassembly, installation, increasing the labor intensity of staff, reducing the effectiveness of the work. Thus, about 52% of the wells team site uses Kill manifold as a daily infusion, in 2013, "Northwest Oilfield Branch Well Control Rules" additional regulation 5.7.8 in "Kill manifold can not be used as a drilling fluid infusion daily use," so Kill manifold as a daily infusion would no longer be used.
2 wellhead cement grouting equipment to develop reason and due to be confirmed by the Tahe Oilfield absorption well cement grouting Survey, absorption well wellhead cement grouting equipment will help the group develop the next column to prevent the wells falling during completion was expected in the cement grouting process safe and reliable, regular fill slurry, reduce the risk of falling matter of wells, pipelines frequently reduce the installation and removal of causing consumption intensity, improve work effectiveness. To determine a reason: the group during the next column when the double preventer no fixed cement grouting hose device, resulting in cement grouting hose shaking after investigation and verification, cement grouting hose directly inserted in the double preventer, and when cement grouting hose shaking.
Conclusion: The need to increase the cement grouting hose fixing device to prevent the hose from side to side during cement grouting.
To determine the result of two: under completion string group during grouting hose bump and cement, resulting in cement grouting hose off.
After investigation and verification, the period set under completion string, string driller operating instability led to violent shaking, string and cement grouting hose frequently bump, leading to Hammer Uniom head off into the well, resulting in falling matter well.
Conclusion: The completion string should avoid contact with the cement grouting hose, pulp and set up under achieve completion string independently of each other.
To determine the result of three: In the process of completion string group and cement grouting hose eccentric wear, resulting in cement grouting hose eccentric wear debris was falling into the well.
After investigation and verification, the period set under completion string, string and cement grouting hose frequently eccentric wear, leading to hose resulting detritus falling into the well.
Conclusion: The completion string should avoid contact with the cement grouting hose, pulp and set up under achieve completion string independently of each other. To determine the result of four: cement grouting hose frequent mounting and dismounting, increasing the labor intensity of staff, reduce operating effectiveness through understanding verified during the site during cement grouting, cement grouting before the need to cement grouting hose into the inner double ram, after the need Unplug from double ram, but cement grouting hose frequent removal, installation, increasing the labor intensity of staff, reducing the effectiveness of the work.
Conclusion: The increase of fixed cement grouting hose device, avoid frequent during the installation of cement grouting, demolition hose, improve work effectiveness.
After analysis, to be due to one, two, three, four main factors that cement grouting device applications, and column groups in the process of shaking and cement grouting hose frequently bump or partial mill, Hammer Uniom head or hose off detritus Drop into the well, resulting in falling matter well. cement during cement grouting grouting hose frequent removal, installation, increasing the labor intensity of staff, reducing the effectiveness of the work.
3 wellhead cement grouting means to achieve the development goals
(1) by machining bell, placed on top of double ram, not only to meet the fixed cement grouting pipeline as well as lower the chance of falling matter well;
(2) to prevent the loss probability of 100%;
(3) improve the effectiveness of 10%
(4) On-site installation fast, simple;
(5) simple structure, set up under the pulp and completion strings do not conflict, and easy to maintain.
Example 4 Strategies
(1) the use of the well casing team scrapped interception proper height, processed into the bell, just connected to the casing size double preventer.
(2) in the side of the processing Hammer Uniom bell mouth, so that connected with cement grouting hose.
5 field application
Since the absorption well apply wellhead cement grouting apparatus has been used 50 wells, through field investigation, site cement grouting hose Hammer Uniom fall, cement grouting hose significantly reduce the chance of falling, cement grouting pipeline rigid fixation, reducing the staff frequently installed Removal cement grouting hose workload, improve the operating limitations, determined to achieve the target of 100%.
In S72-16 well, for example, an hour twice cement grouting, cement grouting conventional manner to increase time of 10min per hour for installation and removal of cement grouting hose, set design at completion string when used with 36h, fixed hanging pot means After saving time 36 * 10min = 360min = 6h, during the completion date to calculate the fee 6W, S72-16 cost savings 6/24 * 6 = 15,000. Every year for the calculation of the amount of 600 absorption well, installing a wellhead cement grouting equipment cost savings of about 900,000 per year.
6 results and understanding
(1) absorption developed well wellhead cement grouting device for the first time in Tahe Oilfield completion field has been applied, the site cement grouting hose Hammer Uniom fall, cement grouting hose significantly reduce the chance of falling, cement grouting pipeline rigid fixation, reducing the staff frequently installation, demolition cement grouting hose workload, improve the operating limitations, determined to achieve the target of 100%.
(2) Application of absorption well cement grouting apparatus for absorption well rationing cement grouting can provide well control security;
(3) S72-16, T753CH absorption well and so successfully applied, greatly improving the timeliness completion phase, completion cost savings, efficiency of the section in line with the trend, with a great promotion prospects.